2024 Spiral classifier

The ball mill and spiral classifier work together, to be a close circuit grinding system, to control the materials to be grinded as you want.More details ple... . Tukish porn

Spiral classifier is one of beneficiation equipment, based on user requirements, it can be divided into single and double spiral classifier. Depend on specific gravity of solid particles, so different sedimentation velocity in a liquid principle, spiral classifier is a mechanical grading equipment.Submerged Spiral Classifier Market Enigma on a Global Stage | Phenomenal Growth Outlook to 2030 Sep 8, 2023 ...The classifier designs differ mainly in the mode of removing the underflow and the overflow slurries. Immersed spiral or rakes are generally used for underflow slurries and an open launder carries the overflow. Figure 13.1 is a sketch of a spiral classifier where the spiral conveyor is installed within the bowl. The spiral operates along the ...The spiral classifier is widely applied for the following fields: combine with ball grinder into closed circulation for ore-sand separation in the ore separation plant; classify ore sand and fine sludge in gravity ore separation plant; classify the grain of ore pulp at the metal ore separation process; and remove sludge/water at the ore separation process. Oct 20, 2017 · Mokup of classifier, 2 principles, 1600 mm screw diameter. Still in use in several silica sand plant: wash drain and dedusting. Comparing Spiral Classifier with Hydro-cyclone, the prominent advantage of Spiral Classifier is reliable-working, simple-operation, stable-classifier area, more fine overflow particle, big tank ...Apr 13, 2023 · Spiral classifier is used for material classification with spirals used to stir and convey materials according to the difference in material settling velocities. It is a kind of gravitational and hydraulic classifiers. The specification of spiral classifiers is represented by the number and diameter of spirals. 13.5.3.4 Spiral Concentrator. The spiral concentrator is a modern high-capacity and low-cost device. It is developed for concentration of low-grade ores and industrial minerals in slurry form. It works on a combination of solid particle density and its hydrodynamic dragging properties.CLASSIFIER Pemisahan dengan alat classifier disebut proses klaisiskasi Pengertian klaisfikasi : Pemisahan bahan padat menjadi 2 fraksi atau lebih berdasarkan kecepatan gerak padatan dalam fluida. fKlasifikasi dibagi 2 : 1. Sizing pemisahan dengan klasifikasi untuk zat atau bahan yang sama densitasnya tetapi ukurannya berbeda.The spiral speed and feed tonnage correlated negatively to the Mn grade with washing time correlating positively. Operating the spiral classifier at a feed rate, spiral speed and washing time of 6 t, 25 rev/min, and 30 min, respectively, yielded Mn grade of 53%. Spiral Dewaterer model - SD Metso spiral dewaterer model SD is a robust evolution of the spiral classifier for reliable operations in mill scale handling. The spiral dewaterer with special designed spiral and enlarged pool area is able to handle large flows of effluents, offering a well dewatered mill scale product and a clear overflow ...Market Overview: The spiral classifier market is expected to grow at a CAGR of 7.5% during the forecast period from 2022 to 2030. This growth can be attributed to the increasing demand for efficient and accurate processing of materials. The ball mill and spiral classifier work together, to be a close circuit grinding system, to control the materials to be grinded as you want.More details ple...Mokup of classifier, 2 principles, 1600 mm screw diameter. Still in use in several silica sand plant: wash drain and dedusting. spiral classifier 1600 | 3D CAD Model Library | GrabCAD Description FC and FG Series Spiral Classifier is mainly used in pre-classification and examination classification of grinding circuit in concentration plant and aggregate plant as well as desliming and dehydration in the process of sand washing. It can be classified into single spiral and double spiral according to the spiral quantity; and high weir type and sinking type according to the ...Dec 6, 2017 · Comparing Spiral Classifier with Hydro-cyclone, the prominent advantage of Spiral Classifier is reliable-working, simple-operation, stable-classifier area, more fine overflow particle, big tank ... A Spiral Classifier is a machine that is primarily used to classify the slimes (fines) from a coarser, sandy sized material. It has an inclined trough with one or two spirals revolving slowly and free from touching the sides or bottom of the tank. The motion of the spiral creates Pool Hindered Settling in the bottom pool area, where the ... Chapter 1: Submerged Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ...This spiral classifier/dewatering screw is a multi-purpose machine. As a classifier, it separates out the smaller waste particles from the ore processor tailings. The larger particles can then be returned to the grinding circuit for finer grinding to liberate more values. Many locations don’t have a ready source of water, so when used as a ... Sep 7, 2023 · Chapter 1: High Weir Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ... The spiral classifier is based on the principle that the solid particles are different in size and specific gravity, so the settling speed in the liquid is different. Fine ore particles float in the water and overflow, and coarse ore particles sink to the bottom of the tank. The rotation speed of the commonly used spiral classifier is. To obtain coarse overflow, the speed of the spiral with a diameter of 2 m should not exceed 6 r/min, and with a diameter of 1 m or more should be controlled at 2-8 r/min. For example, for a spiral with a diameter of 0.3 m, in order to obtain a coarse overflow, the spiral speed can be ... Oct 20, 2017 · Mokup of classifier, 2 principles, 1600 mm screw diameter. Still in use in several silica sand plant: wash drain and dedusting. This is an example of vanilla Tensorflow playground with no added features and no modifications. The run for Spiral was between 187 to ~300 Epoch, depending. I used Lasso Regularization L1 so I could eliminate coefficients. I decreased the batch size by 1 to keep the output from over fitting.Spiral classifier is mainly composed of the driving device, the spiral body, the groove body, the lifting mechanism, the lower seat and discharge valve. The machine base adopts channel steel, the body adopts welded steel plate. Screw shaft parts use the pig iron, and wear resistance. Working Principle:Published Jun 28, 2023. + Follow. The market research conducted by Global High Weir Spiral Classifier Market offers an in-depth analysis of the global market, with a focus on future projections ...The rotation speed of the commonly used spiral classifier is. To obtain coarse overflow, the speed of the spiral with a diameter of 2 m should not exceed 6 r/min, and with a diameter of 1 m or more should be controlled at 2-8 r/min. For example, for a spiral with a diameter of 0.3 m, in order to obtain a coarse overflow, the spiral speed can be ... China Spiral Classifier manufacturers - Select 2023 high quality Spiral Classifier products in best price from certified Chinese Mining Equipment, Mining Machine suppliers, wholesalers and factory on Made-in-China.com The design of a McLanahan Fine Material Screw Washer provides significant advantages over other sand screws you could consider that include: Larger pool settling areas behind the feed box/baffle plate that provide higher retention of +75 micron (200 mesh) product sized solids. A machine design that has a 2.5" (65mm) gap between the screw shaft ...Apr 13, 2023 · Spiral classifier is used for material classification with spirals used to stir and convey materials according to the difference in material settling velocities. It is a kind of gravitational and hydraulic classifiers. The specification of spiral classifiers is represented by the number and diameter of spirals. Triveni Spiral Classifiers utilize an increased for maximum torque and quiet, trouble free. lead or helix angle to form the continuous high pitch performance. Spiral for greater raking capacity. The upper main bearing is over sized for normal. Classifier service. Also this bearing and gear pivot is on.To understand how these two classifiers make use of this settling action, a description of them is required. First, to have the classification happen, the slurry must be able to flow. This means the classifiers must be inclined. The working portion of these two classifiers are the RAKES or SPIRAL/screw which are placed into the flow of ore. To ...The Submerged Spiral Classifier Market is undergoing a remarkable transformation, fueled by cutting-edge technologies and a deep commitment to meeting user needs. Companies within the industry are ...Spiral Classifier 【Capacity】: 10-900t/24h 【Moto power】: 3-30Kw 【Spiral diameter】: 300mm-3000mm 【Processible Materials】: Natural sand, artificial sand, machine-made sand. 【Application】: Clean mud and water or working with ball mill to control material size. Chat Online on WhatsApp Email Us Make A Quote Advantages Product StructureOct 22, 2019 · Misconception 4: Fine Material Screws are recommended for cutting at a coarse sand size. Fine Material Screw Washers generally are not recommended for removing fine solids larger than 150 micron or 100 mesh. When a separation ranging from 150 to 800 micron (or 100 to 20 mesh) is required, other types of classifiers, like Hydrosizers™ (or ... Aug 6, 2015 · The spiral classifier such as the Akins classifier consists of a semi-cylindrical trough (a trough that is semicircular in cross-section) inclined to the horizontal. The trough is provided with a slow-rotating spiral conveyor and a liquid overflow at the lower end. Nov 28, 2022 · High Weir Spiral Classifier, one of the segments analyzed in the report, is projected to record 2.3% CAGR and reach US$827.7 Million by the end of the analysis period. Taking into account the ... Walker mining produce Submerged and hig weir double spiral classifier,Submerged and High-weir double spirals classifier. Product Introduction Spiral classifier is a common beneficiation equipment. It’s widely used in concentrators and ball mills to form a closed-circuit cycle and separate ore sand, or in gravity concentrators to classify ore ...Spiral Dewaterer model - SD Metso spiral dewaterer model SD is a robust evolution of the spiral classifier for reliable operations in mill scale handling. The spiral dewaterer with special designed spiral and enlarged pool area is able to handle large flows of effluents, offering a well dewatered mill scale product and a clear overflow ...Apr 13, 2023 · Spiral classifier is used for material classification with spirals used to stir and convey materials according to the difference in material settling velocities. It is a kind of gravitational and hydraulic classifiers. The specification of spiral classifiers is represented by the number and diameter of spirals. EIMCO-K.C.P. Spiral Classifiers are mechanically the devices are powerfully built, and functionally they are versatile and flexible. Today’s worldwide acceptance of EIMCO-K.C.P. Classifiers for washing and dewatering pulps, and in closed-circuit grinding is the result of many years of experience in solving wet classification problems.May 15, 2016 · Spiral classifiers. A typical spiral classifier is shown in Fig. 1. The geometry of a spiral is characterized by the length or number of turns, the diameter, the pitch and the shape of the trough ( Burt, 1984). The spiral feed is a mixture of water and ground particles that is gravity fed at the top of the spiral. If you don't have the muscle power or time, let a spiral panning machine help you separate the gold from your concentrates and black sand much more quickly and easily. FREE SHIPPING on orders of $350 or more! To learn more about the manufacturer and use of the Desert Fox, Mountain Goat, and Pro Camel, scroll to the bottom of this page. 13.5.3.4 Spiral Concentrator. The spiral concentrator is a modern high-capacity and low-cost device. It is developed for concentration of low-grade ores and industrial minerals in slurry form. It works on a combination of solid particle density and its hydrodynamic dragging properties.Spiral Classifier 【Capacity】: 10-900t/24h 【Moto power】: 3-30Kw 【Spiral diameter】: 300mm-3000mm 【Processible Materials】: Natural sand, artificial sand, machine-made sand. 【Application】: Clean mud and water or working with ball mill to control material size. Chat Online on WhatsApp Email Us Make A Quote Advantages Product StructureChapter 1: High Weir Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ...The ball mill and spiral classifier work together, to be a close circuit grinding system, to control the materials to be grinded as you want.More details ple...Sep 3, 2021 · The spiral classifier agitates the pulp by spiral low-speed rotation, by which the fine particles float to the overflow, and the coarse particles sink to the bottom of the tank and are discharged ... In this video, Jason describes the many benefits and uses of our Spiral Classifier, also called a Screw Conveyor, De-watering Screw, and Auger Conveyor. The ...Chapter 1: High Weir Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ...13.5.3.4 Spiral Concentrator. The spiral concentrator is a modern high-capacity and low-cost device. It is developed for concentration of low-grade ores and industrial minerals in slurry form. It works on a combination of solid particle density and its hydrodynamic dragging properties. 13.5.3.4 Spiral Concentrator. The spiral concentrator is a modern high-capacity and low-cost device. It is developed for concentration of low-grade ores and industrial minerals in slurry form. It works on a combination of solid particle density and its hydrodynamic dragging properties. A study was carried out to select the appropriate coatings for corrosion protection of the spiral classifier working at KGHM Polska Miedź S.A. Ore Concentration Plant. The abrasion resistance of selected protective coatings and wear-resistant linings was investigated using a DT-523 rotary abrasion tester with Taber CS-10 rubber abrasive discs. The average weight loss of the coatings after a ...Spiral classifier is composed of motor, reducer, cylindrical gear and bevel gear. 2. Spiral (left and right) It is composed of the hollow shaft, bracket, spiral blade, lining iron, etc. The hollow shaft is welded by seamless steel pipe, journal and flange. Wear-resistant life is the key in use, so the lining iron is made of wear-resistant ... Submerged Spiral Classifier Market Enigma on a Global Stage | Phenomenal Growth Outlook to 2030 Sep 8, 2023 ...Spiral classifiers. A typical spiral classifier is shown in Fig. 1. The geometry of a spiral is characterized by the length or number of turns, the diameter, the pitch and the shape of the trough (Burt, 1984). The spiral feed is a mixture of water and ground particles that is gravity fed at the top of the spiral.A study was carried out to select the appropriate coatings for corrosion protection of the spiral classifier working at KGHM Polska Miedź S.A. Ore Concentration Plant. The abrasion resistance of selected protective coatings and wear-resistant linings was investigated using a DT-523 rotary abrasion tester with Taber CS-10 rubber abrasive discs. The average weight loss of the coatings after a ...This spiral classifier/dewatering screw is a multi-purpose machine. As a classifier, it separates out the smaller waste particles from the ore processor tailings. The larger particles can then be returned to the grinding circuit for finer grinding to liberate more values. Many locations don’t have a ready source of water, so when used as a ...CLASSIFIER Pemisahan dengan alat classifier disebut proses klaisiskasi Pengertian klaisfikasi : Pemisahan bahan padat menjadi 2 fraksi atau lebih berdasarkan kecepatan gerak padatan dalam fluida. fKlasifikasi dibagi 2 : 1. Sizing pemisahan dengan klasifikasi untuk zat atau bahan yang sama densitasnya tetapi ukurannya berbeda.This is an example of vanilla Tensorflow playground with no added features and no modifications. The run for Spiral was between 187 to ~300 Epoch, depending. I used Lasso Regularization L1 so I could eliminate coefficients. I decreased the batch size by 1 to keep the output from over fitting.Mokup of classifier, 2 principles, 1600 mm screw diameter. Still in use in several silica sand plant: wash drain and dedusting. spiral classifier 1600 | 3D CAD Model Library | GrabCADThe preferential classification benefit of cyclones is further illustrated in Table 2 which compares the metallurgical results of cyclones versus spiral classifiers in a copper grinding circuit. The cyclone produced an overflow product containing more copper in the finer size ranges where it will be subject to higher recovery in flotation. If you don't have the muscle power or time, let a spiral panning machine help you separate the gold from your concentrates and black sand much more quickly and easily. FREE SHIPPING on orders of $350 or more! To learn more about the manufacturer and use of the Desert Fox, Mountain Goat, and Pro Camel, scroll to the bottom of this page.If you don't have the muscle power or time, let a spiral panning machine help you separate the gold from your concentrates and black sand much more quickly and easily. FREE SHIPPING on orders of $350 or more! To learn more about the manufacturer and use of the Desert Fox, Mountain Goat, and Pro Camel, scroll to the bottom of this page.Triveni Spiral Classifiers utilize an increased for maximum torque and quiet, trouble free. lead or helix angle to form the continuous high pitch performance. Spiral for greater raking capacity. The upper main bearing is over sized for normal. Classifier service. Also this bearing and gear pivot is on. Dec 1, 2020 · This is an example of vanilla Tensorflow playground with no added features and no modifications. The run for Spiral was between 187 to ~300 Epoch, depending. I used Lasso Regularization L1 so I could eliminate coefficients. I decreased the batch size by 1 to keep the output from over fitting. EIMCO-K.C.P. Offers Bridge mounted (B) type, Column Mounted (C) Type and Traction driven (T) type Classifiers mechanism for various applications. These operate on the common principle of moving settled solids to the center of principle of moving settled solids to the centre of the tank for removal, and differ principally in the method used to ...Oct 22, 2019 · Misconception 4: Fine Material Screws are recommended for cutting at a coarse sand size. Fine Material Screw Washers generally are not recommended for removing fine solids larger than 150 micron or 100 mesh. When a separation ranging from 150 to 800 micron (or 100 to 20 mesh) is required, other types of classifiers, like Hydrosizers™ (or ... Spiral classifier is a mechanical classification machine based on the principle that the specific gravity of solid particles is different in the speed of precipitation in liquid. During the beneficiation process, the ore needs to be ground to a certain fineness so that the fine-grained useful minerals and gangue can be fully dissociated and ... Lab Spiral Classifier. This Lab Spiral classifiers suitable for dewatering, medium drainage and desliming and wet and dry classifying for ore, Non-metallic materials, etc. Spiral classifier is a type of classifying equipment which realizes mechanical classification under the principle that materials settle in the liquid at different speeds due ... In the changed post COVID-19 business landscape, the global market for Spiral Classifier estimated at US$1. 1 Billion in the year 2020, is projected to reach a revised size of US$1. 3 Billion by ...Triveni Spiral Classifiers utilize an increased for maximum torque and quiet, trouble free. lead or helix angle to form the continuous high pitch performance. Spiral for greater raking capacity. The upper main bearing is over sized for normal. Classifier service. Also this bearing and gear pivot is on. The mineral separation spiral classifier is used in the dressing plant to match with the ball mill to distribute the ore sand, or in the gravity dressing plant to classify the ore and mud. The particle size classification of the slurry in the metal beneficiation process and the desilting and dewatering of the washing Wait for homework.If you don't have the muscle power or time, let a spiral panning machine help you separate the gold from your concentrates and black sand much more quickly and easily. FREE SHIPPING on orders of $350 or more! To learn more about the manufacturer and use of the Desert Fox, Mountain Goat, and Pro Camel, scroll to the bottom of this page. Particles below a certain size and density are carried away with the water-flow, whereas the coarser and heavier particles settle. Basically the different wet classifiers are gravity settling tank, cone classifier, double cone classifier, hydrocyclone classifier, spiral classifier, and rake classifier. Gravity settling tank is the simplest type ...Spiral Dewaterer model - SD Metso spiral dewaterer model SD is a robust evolution of the spiral classifier for reliable operations in mill scale handling. The spiral dewaterer with special designed spiral and enlarged pool area is able to handle large flows of effluents, offering a well dewatered mill scale product and a clear overflow ... This spiral classifier/dewatering screw is a multi-purpose machine. As a classifier, it separates out the smaller waste particles from the ore processor tailings. The larger particles can then be returned to the grinding circuit for finer grinding to liberate more values. Many locations don’t have a ready source of water, so when used as a ... XBM Mining is a leading global supplier of equipment and tools, service and technical solutions for the mining industry,especially specialized in ore benefic...Spiral Classifier Wet classification is the art of solid-liquid separators i.e spiral separator, separating the solid particles in a mixture of solids and liquids into fractions according to particle size or density by methods other than screening.It is evident that no linear classifier will be able to do a good job classifying spiral data where the boundary between two classes is a curve. A simple two layer network with RELU activation on the hidden layer automatically learns the decision boundaries and achieves a 99% classification accuracy on such a data set.

Shaker Tables. MBMM produces high-performance shaker tables for gravity separation based on different material densities. They are designed for maximum performance by combining the best of many proven designs, refined after many hundreds of hours of R&D. The most notable feature is from an old 1909 Deister patent: a ramp and plateau system ... . Documents row compact

Aug 23, 2019 · The ball mill is for grinding 0-20mm to small powder. It works together with the spiral classifier, so the overflow slurry from the classifier is about 80% 200mesh powder. The oversize particle from the classifier will go back to the ball mill grinding again, to form a closed-loop. Spiral classifier is one of beneficiation equipment, based on user requirements, it can be divided into single and double spiral classifier. Depend on specific gravity of solid particles, so different sedimentation velocity in a liquid principle, spiral classifier is a mechanical grading equipment. Spiral Classifier 【Capacity】: 10-900t/24h 【Moto power】: 3-30Kw 【Spiral diameter】: 300mm-3000mm 【Processible Materials】: Natural sand, artificial sand, machine-made sand. 【Application】: Clean mud and water or working with ball mill to control material size. Chat Online on WhatsApp Email Us Make A Quote Advantages Product StructureMisconception 4: Fine Material Screws are recommended for cutting at a coarse sand size. Fine Material Screw Washers generally are not recommended for removing fine solids larger than 150 micron or 100 mesh. When a separation ranging from 150 to 800 micron (or 100 to 20 mesh) is required, other types of classifiers, like Hydrosizers™ (or ...Sep 5, 2023 · Chapter 1: Submerged Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ... XBM Mining is a leading global supplier of equipment and tools, service and technical solutions for the mining industry,especially specialized in ore benefic...Gravity Spiral Concentrator Working Principle. The gravity spiral circuit is designed to extract and concentrate “coarse gold’ from the recirculating load in the mill grinding circuit and hence prevent a build-up within that circuit and the eventual escape of some of that gold into the C.I.L. tanks and thereon into the final tails. (See fig. 4)To understand how these two classifiers make use of this settling action, a description of them is required. First, to have the classification happen, the slurry must be able to flow. This means the classifiers must be inclined. The working portion of these two classifiers are the RAKES or SPIRAL/screw which are placed into the flow of ore. To ...Description FC and FG Series Spiral Classifier is mainly used in pre-classification and examination classification of grinding circuit in concentration plant and aggregate plant as well as desliming and dehydration in the process of sand washing. It can be classified into single spiral and double spiral according to the spiral quantity; and high weir type and sinking type according to the ...10.3.2 Bahan. Bahan yang digunakan dalam percobaan Spiral Classifier yaitu : 1. Mineral Kasiterit (SnO2) dengan ukuran – 40 + 70 # yakni sebanya 1 kg. 2. Zeolit yakni hasil kominusi dengan ukuran – 8 + 12 #, sebanyak 3 kg. Sumber : Data Hasil Praktikum PBG, 2017. Foto 10.11 Zeolit.Nov 28, 2022 · High Weir Spiral Classifier, one of the segments analyzed in the report, is projected to record 2.3% CAGR and reach US$827.7 Million by the end of the analysis period. Taking into account the ... Spiral Classifier Wet classification is the art of solid-liquid separators i.e spiral separator, separating the solid particles in a mixture of solids and liquids into fractions according to particle size or density by methods other than screening.Spiral Classifier Wet classification is the art of solid-liquid separators i.e spiral separator, separating the solid particles in a mixture of solids and liquids into fractions according to particle size or density by methods other than screening. The spiral classifier is widely applied for the following fields: combine with ball grinder into closed circulation for ore-sand separation in the ore separation plant; classify ore sand and fine sludge in gravity ore separation plant; classify the grain of ore pulp at the metal ore separation process; and remove sludge/water at the ore separation process.The rake classifier such as the Dorr classifier consists of a rectangular tank with a sloping/inclined bottom. The tank is provided with movable rakes (reciprocating rakes). The feed in the form of a suspension (slurry) is introduced continuously near the middle of the tank. The lower end of the tank has a weir overflow (discharge weir) from ...Lab Spiral Classifier. This Lab Spiral classifiers suitable for dewatering, medium drainage and desliming and wet and dry classifying for ore, Non-metallic materials, etc. Spiral classifier is a type of classifying equipment which realizes mechanical classification under the principle that materials settle in the liquid at different speeds due ... Mar 26, 2016 · Gravity Spiral Concentrator Working Principle. The gravity spiral circuit is designed to extract and concentrate “coarse gold’ from the recirculating load in the mill grinding circuit and hence prevent a build-up within that circuit and the eventual escape of some of that gold into the C.I.L. tanks and thereon into the final tails. (See fig. 4) Mar 25, 2019 · The submerged spiral classifier is suitable for fine particle classification, and the classificaiton overflow particle size is generally less than 0.15 mm. Compared with these two kinds of spiral ... on a slope, with interrupted rake or spiral blades to move the settled solids to a central discharge cone. Tank diameters vary from 4 to 250 ft. Tank depths at center are 2 to 3 ft for small units and up to 25 ft for larger units. Hydraulic classifiers of the sizer and super-sorter types, Figs. 7 and 8, are narrow, deep, rectangular .

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