A fully automatic washing and sorting method and system for porcelain clay

Abstract

The present invention discloses a fully automatic elution and sorting method and system for porcelain clay, relating to the technical field of porcelain clay elution and sorting. Specifically, the method comprises the following steps: the porcelain clay raw material is screened by a sieve-belt integrated machine to generate a first oversize material and a first undersize material; the first oversize material is crushed and then screened again by the sieve-belt integrated machine; the first undersize material is washed by a sand washer to generate a second undersize material; the second undersize material passes through a cyclone group to generate a second overflow; the second overflow is subjected to an iron removal treatment and then injected into a slurry tank; the slurry in the slurry tank is subjected to filter pressing and dehydration operations to produce product A. The present invention screens and elutes natural porcelain clay ore to obtain porcelain clay with stable and reliable performance, thereby improving the quality of electrical porcelain products and resolving the problem that natural porcelain clay ore, due to its unstable ore source and large fluctuations in physical and chemical properties, is not conducive to the production of electrical porcelain products.

Description

Technical Field

[0001] The present invention relates to the technical field of porcelain clay washing and sorting, and more particularly to a fully automatic porcelain clay washing and sorting method and system. Background Art

[0002] As the voltage levels of insulator products increase, insulator formulations are evolving from standard porcelain to high-strength porcelain. The technical performance requirements for insulator materials are becoming increasingly stringent, placing increasing demands on the purity and quality of raw materials. Clay is a crucial raw material in insulator manufacturing, serving as the foundation of the wet-molding process. High-strength porcelain uses relatively little clay, so to ensure moldability, the performance requirements for the clay are even more stringent.

[0003] China clay, a key clay raw material, is formed through the metamorphosis of mica and feldspar, the loss of sodium, potassium, calcium, and iron, and the addition of water. China clay has a pearly luster and is generally pure white or light gray, but can also appear yellow or brown if it contains significant impurities. Most clay is either dense or loose.

[0004] Raw porcelain clay can be divided into three types based on its quality, plasticity, and sand content. Hard porcelain clay is inherently hard and non-plastic, but becomes plastic after crushing and ball milling. Soft porcelain clay is inherently soft, generally highly plastic, and has a sand content of less than 50%. Sandy porcelain clay is inherently soft and generally less plastic, but has a sand content of more than 50%, and becomes highly plastic after sand removal.

[0005] Porcelain clay inevitably contains a large amount of lumpy material and a certain amount of quartz sand particles. Natural raw porcelain clay ore is characterized by unstable ore sources, large fluctuations in physical and chemical properties, and high levels of impurities and organic matter. Therefore, if raw porcelain clay ore without further processing is directly used in the production of insulators, it will inevitably lead to significant differences in the chemical composition and process performance of the formula, ultimately resulting in unstable performance of the insulators and even quality problems.

[0006] The commonly used porcelain clay elution process currently involves subjecting the raw clay to a series of treatments, including elution by hydration, electromagnetic iron removal, and filtration and slag removal, before finally squeezing it into a cake. For clays with relatively stable ore sources (consistent clay type and stable chemical composition), this simple elution process can indeed produce clays with stable and reliable properties, facilitating the subsequent production of electrical porcelain products and improving product quality. However, for natural clay ores, this simple elution process cannot produce clays with stable and reliable properties due to their unstable ore sources, large fluctuations in physical and chemical properties, and the presence of a certain amount of sand particles and possibly hard lumps.

[0007] Therefore, how to provide a fully automatic washing and sorting method and system for porcelain clay is a problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0008] In view of this, the present invention provides a fully automatic washing and sorting method and system for porcelain clay, which can screen and wash natural porcelain clay ore, thereby solving the problem that natural porcelain clay ore is not conducive to the production of electrical porcelain products due to unstable ore sources and large fluctuations in physical and chemical properties. The present invention can obtain porcelain clay with stable and reliable performance, thereby improving the quality of electrical porcelain products.

[0009] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0010] The porcelain clay raw materials are screened by the sieve belt integrated machine to generate the first screen upper material and the first screen lower material;

[0011] After the first screen material is crushed, it enters the screen belt integrated machine for screening again;

[0012] The first screen material is washed by a sand washer to generate a second screen material;

[0013] The second undersize material passes through the cyclone group to generate a second overflow;

[0014] After the second overflow is subjected to iron removal treatment, it is injected into the clean pulp tank;

[0015] The slurry in the slurry cleaning tank is subjected to filter pressing and dehydration operations to produce product A.

[0016] Preferably, the second undersize material passes through the cyclone group to generate the second overflow, which specifically includes:

[0017] The second screen undersize material first passes through a coarse sand recovery cyclone group to generate a first overflow;

[0018] The first overflow enters the transfer tank for treatment and then passes through the fine sand recovery cyclone group to generate the second overflow.

[0019] Preferably, the first screen undersize material is washed by a sand washer to generate the second screen oversize material;

[0020] The second screen underflow first passes through a coarse sand recovery cyclone group, and also generates a first underflow;

[0021] The first underflow and the second oversize are dehydrated to produce a by-product B.

[0022] Preferably, the first overflow enters the transfer tank for treatment and then passes through a fine sand recovery cyclone group to generate a second underflow, which is then dehydrated to produce a by-product C.

[0023] Preferably, the crushing of the first sieve upper material specifically includes: temporarily storing the first sieve upper material in a material storage, and then crushing the first sieve upper material in sequence by a jaw crusher and a roller crusher.

[0024] A fully automatic washing and sorting system for porcelain clay, comprising: a sieve belt integrated machine, a crushing system, a sand washing unit, a cyclone unit, an iron remover, a slurry cleaning tank and a filter press;

[0025] The first screen material output port of the sieve-belt integrated machine is connected to the input port of the crushing system, and the output port of the crushing system is connected to the input port of the sieve-belt integrated machine;

[0026] The first screen material output port of the sieve belt integrated machine is connected to the input port of the sand washing unit;

[0027] The second undersize material outputted by the sand washing unit is connected to the input port of the iron remover through the cyclone group;

[0028] The output port of the iron remover is connected to the input port of the clean pulp tank;

[0029] The output port of the clean pulp tank is connected to the input port of the filter press;

[0030] The filter press is used to output product A.

[0031] Preferably, the cyclone group includes a coarse sand recovery cyclone group, a transfer tank and a fine sand recovery cyclone group;

[0032] The second undersize material output port of the sand washing unit is connected to the input port of the coarse sand recovery cyclone group;

[0033] The first overflow outlet of the coarse sand recovery cyclone group is connected to the transfer tank;

[0034] The transfer tank is connected to the input port of the fine sand recovery cyclone group through a mud pump;

[0035] The second overflow output port of the fine sand recovery cyclone group is connected to the input port of the iron remover.

[0036] Preferably, a fully automatic washing and sorting system for porcelain clay further comprises: a first dehydration system for generating a by-product B;

[0037] The first dewatering system includes a coarse sand linear dewatering screen and a first belt conveyor unit;

[0038] The second screen feeding output port of the sand washing unit is connected to the input of the coarse sand linear dewatering screen;

[0039] At the same time, the first underflow outlet of the coarse sand recovery cyclone group is connected to the input of the coarse sand linear dewatering screen;

[0040] The output of the coarse sand linear dewatering screen is connected to the first belt conveyor unit.

[0041] Preferably, a fully automatic washing and sorting system for porcelain clay further comprises: a second dehydration system for generating a by-product C;

[0042] The second dewatering system includes a coarse sand linear dewatering screen and a second belt conveyor unit;

[0043] The second underflow outlet of the fine sand recovery cyclone group is connected to the input of the coarse sand linear dewatering screen;

[0044] The output of the coarse sand linear dewatering screen is connected to the second belt conveyor unit.

[0045] As can be seen from the above technical solution, compared with the prior art, the present invention provides a fully automatic washing and sorting method and system for porcelain clay, which specifically includes the following steps: the porcelain clay raw material is screened by a screen-belt integrated machine to produce a first oversize material and a first undersize material; the first oversize material is crushed and then screened again by the screen-belt integrated machine; the first undersize material is washed by a sand washer to produce a second undersize material; the second undersize material passes through a cyclone group to produce a second overflow; the second overflow is subjected to iron removal treatment and then injected into a slurry tank; the slurry in the slurry tank is subjected to filter pressing and dewatering operations to produce Product A. The present invention screens and washes natural porcelain clay ore to produce porcelain clay with stable and reliable performance, improves the quality of insulator products, and solves the problem that natural porcelain clay ore, due to its unstable ore source and large fluctuations in physical and chemical properties, is not conducive to the production of insulator products. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0047] Figure 1 The present invention is a schematic flow chart of a fully automatic washing and sorting method for porcelain clay.

[0048] Figure 2 This is a schematic diagram of the fully automatic washing and sorting process of porcelain clay according to an embodiment of the present invention.

[0049] Among them, 1-screen belt integrated machine, 2-jaw crusher, 3-roller crusher, 4-sand washing unit, 5-coarse sand recovery cyclone group, 6-transfer tank, 7-fine sand recovery cyclone group, 8-coarse sand linear dewatering screen, 9-fine sand linear dewatering screen, 10-ironing remover, 11-clean pulp tank, 12-filter press, 13-first belt unit, 14-second belt unit, 15-third belt unit. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] The embodiment of the present invention discloses a fully automatic washing and sorting method for porcelain clay, such as Figure 1 As shown, the process specifically includes: the porcelain clay raw material is screened by a sieve belt integrated machine to generate a first oversize material and a first undersize material; the first oversize material is crushed and then enters the sieve belt integrated machine for screening again; the first undersize material is washed by a sand washing machine to generate a second undersize material; the second undersize material passes through a cyclone group to generate a second overflow; the second overflow is subjected to iron removal treatment and then injected into a clean slurry tank; the slurry in the clean slurry tank is subjected to filter pressing and dehydration operations to produce product A.

[0052] Specifically, the second undersize material passes through the cyclone group to generate the second overflow, which specifically includes: the second undersize material first passes through the coarse sand recovery cyclone group to generate the first overflow; the first overflow enters the transfer tank for processing, and then passes through the fine sand recovery cyclone group to generate the second overflow.

[0053] The cyclone group adopts the principle of centrifugal sedimentation. When the two-phase mixed liquid to be separated enters the cyclone tangentially from the periphery of the cyclone at a certain pressure, a strong three-dimensional elliptical strong rotational shear turbulent motion is generated. Due to the particle size difference between coarse particles and fine particles, they are subjected to different centrifugal forces, centripetal buoyancy, fluid drag, etc., and under the action of centrifugal sedimentation, most of the coarse particles are discharged through the bottom flow port of the cyclone, while most of the fine particles are discharged through the overflow pipe, thereby achieving the purpose of separation and classification. Specifically, the first undersize material is washed by a sand washing machine to generate a second oversize material; the second undersize material first passes through a coarse sand recovery cyclone group to generate a first underflow; the first underflow and the second oversize are dehydrated to produce a by-product B. In the present invention, the coarse particles discharged from the coarse sand recovery cyclone group are discharged through the underflow port and enter the coarse sand linear dewatering screen for dehydration to produce a by-product B.

[0054] Specifically, the first overflow enters the transfer tank for treatment and then passes through the fine sand recovery cyclone group, generating a second underflow. This second underflow is dehydrated to produce by-product C. Fine particles discharged from the coarse sand recovery cyclone group are discharged through the overflow pipe and enter the fine sand recovery cyclone group for further screening to separate coarse and fine particles. The coarse particles discharged from the fine sand recovery cyclone group are dehydrated to produce by-product C. The fine particles discharged from the fine sand recovery cyclone group enter the iron remover for iron removal.

[0055] Specifically, the crushing of the first sieve-mounted material includes: temporarily storing the first sieve-mounted material in a material storage, and then crushing the first sieve-mounted material in sequence through a jaw crusher and a roller crusher. The diameter of the crushed particles of the roller crusher is substantially the same as the diameter of the sieve holes in the sieve-belt integrated machine.

[0056] A jaw crusher is a device that crushes materials by moving jaws. It consists of a frame, jaws, eccentric shaft, rocker arm, and adjustment device. The frame is the crusher's supporting structure, the jaws are the working parts for crushing materials, the eccentric shaft is the power mechanism that drives the jaws to swing, the rocker arm connects the eccentric shaft and jaws, and the adjustment device is used to adjust the gap and inclination of the jaws. The jaws are typically made of high-manganese steel for excellent wear resistance. A double-roll crusher is a device that crushes materials using two parallel rollers. It consists of a frame, rollers, a hydraulic system, and a motor. The rollers are typically made of carbide or high-manganese steel and are called fixed rollers and movable rollers, respectively. The fixed rollers are fixed to the frame, while the movable rollers apply pressure via a hydraulic system or spring system, trapping the material between the fixed and movable rollers for crushing. This invention first crushes the primary screened material with a jaw crusher, and then performs secondary crushing with a double-roll crusher. This ensures that the screened material is fully crushed, improving operating efficiency.

[0057] A fully automatic washing and sorting system for porcelain clay, comprising: a sieve belt integrated machine, a crushing system, a sand washing unit, a cyclone unit, an iron remover, a slurry cleaning tank and a filter press;

[0058] The first oversize material output port of the sieve-belt integrated machine is connected to the input port of the crushing system, and the output port of the crushing system is connected to the input port of the sieve-belt integrated machine; the first undersize material output port of the sieve-belt integrated machine is connected to the input port of the sand washing unit; the second undersize material output by the sand washing unit is connected to the input port of the iron remover through the cyclone group; the output port of the iron remover is connected to the input port of the clean pulp tank; the output port of the clean pulp tank is connected to the input port of the filter press; the filter press is used to output product A.

[0059] Specifically, the cyclone group includes a coarse sand recovery cyclone group, a transfer tank and a fine sand recovery cyclone group; the second undersize material output port of the sand washing machine group is connected to the input port of the coarse sand recovery cyclone group; the first overflow output port of the coarse sand recovery cyclone group is connected to the transfer tank; the transfer tank is connected to the input port of the fine sand recovery cyclone group through a mud pump; the second overflow output port of the fine sand recovery cyclone group is connected to the input port of the iron remover.

[0060] Specifically, a fully automatic washing and sorting system for porcelain clay also includes: a first dewatering system for generating a by-product B; the first dewatering system includes a coarse sand linear dewatering screen and a first belt conveyor unit; the second screen feeding output port of the sand washing unit is connected to the input of the coarse sand linear dewatering screen; at the same time, the first underflow output port of the coarse sand recovery cyclone group is connected to the input of the coarse sand linear dewatering screen; the output of the coarse sand linear dewatering screen is connected to the first belt conveyor unit.

[0061] Specifically, a fully automatic washing and sorting system for porcelain clay also includes: a second dewatering system for generating a by-product C; the second dewatering system includes a coarse sand linear dewatering screen and a second belt conveyor unit; the second underflow output port of the fine sand recovery cyclone group is connected to the input of the coarse sand linear dewatering screen; the output of the coarse sand linear dewatering screen is connected to the second belt conveyor unit.

[0062] Specifically, the crushing system includes a material storage, a jaw crusher and a roller crusher connected in sequence; the material storage is used to temporarily store the first screen material, the jaw crusher is used to perform a first crushing on the first screen material, and the roller crusher is used to perform a second crushing on the first screen material; the first screen material after the second crushing is transported to the screen belt integrated machine for re-screening.

[0063] In a specific embodiment of the present invention, Luxi County is a production area for porcelain clay in Jiangxi Province, with total reserves exceeding 1 billion tons. Based on current industry usage, the clay has a useful life of hundreds of years. The clay is high-quality, mostly open-pit deposits, and is easily mined. Luxi County porcelain clay is distributed in the Changfeng, Nankeng, and Shangbu areas. The ore bodies are formed by weathering of granite porphyry, quartz porphyry, and rock stocks, and are off-white or white in color. After natural mining and simple crushing, the Luxi Changfeng clay is primarily powdery, with some lumps. The chemical composition of the Changfeng clay is shown in Table 1:

[0064] Table 1. Chemical composition of Changfeng mud (unit: %)

[0065] name <![CDATA[SiO2]]> <![CDATA[Al2O3]]> <![CDATA[Fe2O3]]> <![CDATA[TiO2]]> CaO MgO <![CDATA[K2O]]> <![CDATA[Na2O]]> <![CDATA[SO3]]> IL Nuclear General raw ore 71.56 17.59 1.11 0.06 0.05 0.73 3.62 0.12 0.010 4.84 99.69

[0066] like Figure 2 As shown, the fully automatic sorting process of Changfeng mud is as follows:

[0067] 1. Screening (crushing)

[0068] After the porcelain clay raw materials arrive at the factory, they are temporarily stored in the raw material yard and then loaded by forklift onto the integrated sieve-belt machine 1 (5mm mesh). The material that falls off the first sieve enters the next process; the material that passes through the first sieve is temporarily stored in the material warehouse and then enters the crushing system (jaw crusher 2 and roller crusher 3).

[0069] Crushing: First, use a jaw crusher 2 to crush the porcelain clay material to about 30 mm; then use a double-roll crusher 3 to crush the porcelain clay material to about 5 mm.

[0070] The crushed material is then passed through the sieve belt integrated machine.

[0071] 2. Sand washing

[0072] The undersize material after the screen-belt integrated machine 1 is transported by a belt conveyor to the sand washing unit 4, which is a combination of two bucket sand washers. The material after the second screen of the sand washing unit 4 is passed through the coarse sand linear dewatering screen 8 and the first belt conveyor unit 13 to recover the material with a particle size of 150 μm or more as the by-product B.

[0073] 3. Swirl

[0074] The underflow from the second screen after the sand washing unit 4 enters the coarse sand recovery cyclone unit 5. The underflow of the coarse sand recovery cyclone unit 5 passes through the coarse sand linear dewatering screen 8 and the first belt conveyor unit 13 to recover materials with a particle size of ≥150μm as by-product B.

[0075] The overflow from the coarse sand recovery cyclone group 5 enters the transfer tank 6 and is then pumped by a slurry pump to the fine sand recovery cyclone group 7. The underflow from the fine sand recovery cyclone group 7 passes through the fine sand linear dewatering screen 9 and the second belt conveyor group 14 to recover material with a particle size of 60μm to 150μm as by-product C. By-product C is sand particles.

[0076] 4. Iron removal

[0077] The overflow of the fine sand recovery cyclone group 7 enters the iron remover 10 for iron removal and then is injected into the clean slurry tank 11.

[0078] 5. Filter press

[0079] The slurry in the clean slurry tank 11 is transported to the filter press 12 by a plunger pump. After filtration and dehydration, the slurry enters the third belt conveyor unit 15 to be made into a slurry cake-like product A.

[0080] The specific equipment used in this embodiment is as follows:

[0081] 1) Sand washing unit 4 selects one EN-LX2615-A bucket sand washing machine for the first-stage bucket sand washing machine and one EN-LX2615-A bucket sand washing machine for the second-stage bucket sand washing machine.

[0082] 2) The coarse sand recovery cyclone 5 uses two FJ300 cyclones with a feed pressure of 0.1-0.15 MPa; it is equipped with one 6 / 4E-AH slurry pump.

[0083] 3) The coarse sand linear dewatering screen 8 uses an EN-ZD-1224 linear vibrating dewatering screen.

[0084] 4) The fine sand recovery cyclone 7 uses three FJ250 cyclones with a feed pressure of 0.1-0.15 MPa; it is equipped with one 6 / 4E-AH slurry pump.

[0085] 5) Fine sand linear dewatering screen 9 uses EN-ZD-1848 linear vibrating dewatering screen.

[0086] 6) The iron remover 10 adopts QM360 fully automatic wet electromagnetic iron remover.

[0087] 7) The filter press 12 adopts a 1250 type filter press.

[0088] After washing and sorting, the particle size range and weight proportion of Product A, by-product B and by-product C are shown in Table 2; the chemical composition of Product A, by-product B and by-product C is shown in Table 3.

[0089] Table 2. Particle size range and weight proportion of product A, accompanying product B, and accompanying product C

[0090]

[0091]

[0092] Table 3. Chemical composition of product A, accompanying product B, and accompanying product C (unit: %)

[0093]

[0094] The present invention screens and washes natural porcelain clay ore to obtain porcelain clay with stable and reliable performance, thereby improving the quality of electrical porcelain products and solving the problem that natural porcelain clay ore is not conducive to the production of electrical porcelain products due to unstable ore sources and large fluctuations in physical and chemical properties.

[0095] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0096] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fully automatic washing and sorting method for porcelain clay, characterized in that: Specifically include: The porcelain clay raw materials are screened by the sieve belt integrated machine to generate the first screen upper material and the first screen lower material; After the first screen material is crushed, it enters the screen belt integrated machine for screening again; The first screen material is washed by a sand washer to generate a second screen material; The second undersize material passes through the cyclone group to generate a second overflow; After the second overflow is subjected to iron removal treatment, it is injected into the clean pulp tank; The slurry in the slurry cleaning tank is subjected to filter pressing and dehydration operations to produce product A; The second undersize material passes through the cyclone group to generate the second overflow, which specifically includes: The second screen undersize material first passes through a coarse sand recovery cyclone group to generate a first overflow; The first overflow enters the transfer tank for treatment and then passes through the fine sand recovery cyclone group to generate the second overflow; The first screen undersize material is washed by a sand washer to generate the second screen oversize material; The second screen underflow first passes through a coarse sand recovery cyclone group, and also generates a first underflow; Dehydrating the first underflow and the second oversize material to produce a by-product B; After the first overflow enters the transfer tank for treatment, it passes through the fine sand recovery cyclone group to generate a second underflow, which is dehydrated to produce a by-product C.

2. The fully automatic washing and sorting method for porcelain clay according to claim 1, characterized in that: The crushing process of the first screened material specifically includes: temporarily storing the first screened material in a material storage, and then crushing the first screened material in sequence by a jaw crusher and a roller crusher.

3. A fully automatic washing and sorting system for porcelain clay, characterized in that: include: Screen belt integrated machine, crushing system, sand washing unit, cyclone unit, iron remover, slurry cleaning tank and filter press; The first screen material output port of the sieve-belt integrated machine is connected to the input port of the crushing system, and the output port of the crushing system is connected to the input port of the sieve-belt integrated machine; The first screen material output port of the sieve belt integrated machine is connected to the input port of the sand washing unit; The second undersize material outputted by the sand washing unit is connected to the input port of the iron remover through the cyclone group; The output port of the iron remover is connected to the input port of the clean pulp tank; The output port of the clean pulp tank is connected to the input port of the filter press; The filter press is used to output product A; The cyclone group includes a coarse sand recovery cyclone group, a transfer tank and a fine sand recovery cyclone group; The second undersize material output port of the sand washing unit is connected to the input port of the coarse sand recovery cyclone group; The first overflow outlet of the coarse sand recovery cyclone group is connected to the transfer tank; The transfer tank is connected to the input port of the fine sand recovery cyclone group through a mud pump; The second overflow outlet of the fine sand recovery cyclone group is connected to the inlet of the iron remover; It also includes: a first dehydration system for producing a by-product B; The first dewatering system includes a coarse sand linear dewatering screen and a first belt conveyor unit; The second screen feeding output port of the sand washing unit is connected to the input of the coarse sand linear dewatering screen; At the same time, the first underflow outlet of the coarse sand recovery cyclone group is connected to the input of the coarse sand linear dewatering screen; The output of the coarse sand linear dewatering screen is connected to the first belt conveyor unit; Also included: a second dehydration system for generating a by-product C; The second dewatering system includes a fine sand linear dewatering screen and a second belt conveyor unit; The second underflow output port of the fine sand recovery cyclone group is connected to the input port of the fine sand linear dewatering screen; The output of the fine sand linear dewatering screen is connected to the second belt conveyor unit.

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