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Silica Sand Processing & Washing Plant Equipment

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Published time：16 November 2021

Quartz Silica Sand Introduction

Quartz silica sand is a hard, wear-resistant, and chemically stable silicate mineral. Its main mineral component is SiO2. The color of quartz sand is milky white or colorless and translucent, with a hardness of 7, which is brittle and has no cleavage. Shaped fracture, grease luster, density 2.65, bulk density (1-20 mesh is 1.6-1.8), 20-200 mesh is 1.5, its chemical, thermal and mechanical properties have obvious anisotropy, insoluble in acid, slightly soluble in KOH solution, melting point 1750 °C.

Due to the unique physical and chemical properties of quartz silica sand, it has high-temperature resistance, low thermal expansion coefficient, high insulation, corrosion resistance, piezoelectric effect, resonance effect, and unique optical properties. It is mainly used in glass, ceramics, and refractory materials, metallurgy, construction, chemicals, mechanical casting, electronic aerospace, rubber and plastics, coatings, water purification, etc.

Ordinary Volt Method Glass

Flat glass has good perspective and good light transmission performance (3mm and 5mm thick colorless transparent flat glass has a visible light GB11614-2009, flat glass is based on its The appearance quality is divided into three grades: excellent product, first-class product, and qualified product.
The requirements of ordinary flat glass for quartz sand are: SiO2 (silicon dioxide) = 90-98.5%; Fe2O3 (iron trioxide) = 0.05-0.30 %; A12O3 (alumina) = 5.5-1.0%; particle size: 0.710mm-0.106mm (26-140 mesh).

Photovoltaic Glass Sand

Photovoltaic glass is also ultra-white glass, also known as low iron glass, colorless glass, high transparency glass, with high light transmittance and high transparency. The light transmittance of the glass determines the quality of glass. The light rate is 6%, and the light transmittance of photovoltaic glass can reach more than 92%.
The requirements for quartz sand for photovoltaic glass are generally: S1O2 (silicon dioxide) = 99.5%; Fe2O3 (ferric oxide) =0.0080%; Particle size: 0.710mm-0.106mm (about 26-140 mesh);

Electronic Glass

Generally refers to ultra-thin float glass with a thickness of 0.1 〜2mm° which is mainly used for the production of integrated circuits and glass materials with photoelectric, thermoelectric, acousto-optic, magneto-optical, and other functional components; substrate glass is currently used in microelectronics, One of the most widely used and fastest-growing special glass in high technology such as optoelectronics and new energy. Mainly include substrates for liquid crystal and solar cells.
Electronic glass requirements for quartz sand are: S1O2 (silicon dioxide) 99.6-99.8%; Fe2O3 (ferric oxide) 0.0020-0.0050%; particle size: 0.60mm-0.065mm( 30-220 mesh), the number of segments required is different according to different grades.

Quartz Silica Sand Process Plant

Material: Quartz Silica Sand Ore 
Raw Condition: Raw ore is 4-200 mesh. The iron content of the ore is 200ppm, SiO2:99.58%.
Capacity: 100TPH
Requirements for Finished Sand Products: particle size 50-200 mesh, SiO2 content: >99.8%, iron content≦lOOppm.
Tail Waste Discharge Standard: all production water is recycled and tail sludge is reused.

Silica Sand Washing Plant Flowchart

silica sand washing plant

Silica Sand Washing Plant Explanation & Equipment List

This flowchart design is based on the requirements of the customer. The general process is as follows. 
1. Vibrating screen: Raw materials to the screening to remove the large particles of materials
2. Scrubbing machine: remove the mud in the raw materials
3. Hindered settling machine: To separate +50 mesh products
4. Trommer screen: In order to check again whether there is coarse material
5. Thickening bucket: dry the water in the products
6. Hydraulic classifier: To separate -200 mesh products
7. Spiral chute: to remove the heavy minerals
8. Thickening bucket: dry the water in the products
9. Dewatering screen: recycle the water in the production
10. Finished products: 50-200 mesh

Silica Sand Mining Equipment

• Circular Vibrating Screen

The basic working principle of the GTYZ high-efficiency vibrating screen is that the screen machine is started, and two vibrating motors or vibrators of the same model and specification arranged in a symmetrical arrangement are synchronized and reversed, and the exciting force generated by the vibrating body passes through the vibration transmission body. 一Motor or vibration exciter base is transmitted to the entire vibrating body一the screen box, so that the screen box drives the screen surface to periodically vibrate so that the material on the screen surface will move with the screen box in a directional jumping motion, during which it is smaller than the screen surface The material with the pore size falls to the lower layer through the sieve holes and becomes under the sieve. The material larger than the sieve surface aperture is discharged from the discharge port after continuous jumping motion, and the screening operation is finally completed.

vibrating screen-2

Advantages

  1. The screen surface has a variety of forms such as metal woven mesh, rods, punching, etc. The screen surface has a single-layer structure or a multi-layer arrangement to meet different screening requirements.
  2. The structure is simple and easy to operate, the appearance is beautiful, the rigidity of the whole machine and the strength of each part are large, the relative energy consumption is low, and the screening efficiency is high.
  3. Relatively small in size, light in weight, and large in processing capacity per unit of equipment volume and weight, which is convenient for system process layout.
  4. The modular design of screen surface structure and type, easy to replace, can meet the needs of different environments.
  5. Convenient installation and debugging, stable and reliable operation, simple operation, and maintenance.

• Scrubber Machine

The ore pulp enters the scrubbing machine cavity through the feed pipe, and under the strong stirring action of the impeller, the slurry produces violent turbulence. The mineral particles have huge momentum in them, and they generate violent friction and collision with each other. The impurity film wrapped on the surface of the mineral grains is not strong, so it is easily peeled off the mineral surface after friction and impact. The cement on the mineral surface will loosen and disintegrate after being soaked in water and then through strong friction and collision between mineral particles, so as to achieve the separation of clay and mineral particles. These film impurities and clay are disintegrated and peeled off into the slurry, and the slurry can be separated after subsequent desliming. In the actual production process, different agents should be added according to the actual situation of minerals.

Advantages

  1. With high scrubbing strength, unique tank structure, and impeller configuration, the scrubbing strength is about 30% higher than the traditional scrubbing machine of the same specification.
  2. Wear-resistant and corrosion-resistant, the lining of the tank and the impeller are made of wear-resistant materials, which have high corrosion and wear resistance.

• Desilting Bucket

The separation of sand and mud by means of specific gravity reduces the turbidity of the material and improves classification accuracy.
Vulnerable parts: none.

• Hindered Settlement Machine

The main function is to separate the 20-mesh coarse product. The mixture of sand and water is fed from the upper part through a feeding trough, and moves downwards in the cylinder under the action of gravity. There is a porous water spray plate at the lower part of the cylinder, and the rising water flow interacts with the falling solid particles to gradually form In a fluidized bed, particles of different sizes will fall or move upwards at the hindered drop speed under the volume concentration. With the help of an electronic pressure sensor, the pressure status of the sulfide bed can be measured and the opening of the discharge valve can be automatically adjusted. So as to ensure accurate classification according to the required separation.

Features

  1. The large handling capacity of the blocked settlement machine.
  2. The blocked settling machine is professionally designed with a low flow rate, low wear, and low maintenance rate in the equipment.
  3. The hindered settlement machine runs stably and has a longer service life.
  4. The sub-mesh count of the blocked settlement machine is more stable, the failure rate is low, and the waste of production resources caused by equipment damage is eliminated.
  5. The screening mesh number is accurate, and the hindered settler can achieve precise mesh number classification through adjustment and control.

• Hydraulic Classifier

The main function is to separate the 120 mesh products. The mixture of sand and water is fed from the upper part through a feeding trough and moves downwards in the cylinder under the action of gravity. There is a porous water spray plate at the lower part of the cylinder, and the rising water flow interacts with the falling solid particles to gradually form In a fluidized bed, particles of different sizes will fall or move upwards at the hindered drop speed under the volume concentration. With the help of an electronic pressure sensor, the pressure status of the sulfide bed can be measured and the opening of the discharge valve can be automatically adjusted. The degree to ensure accurate classification according to the required separation.

Features

  1. Under the action of rising water flow, the materials in the cylinder can achieve the purpose of particle size classification or specific gravity separation, with high production efficiency and low energy consumption.
  2. Equipped with an automatic control system, which can change the classification granularity by adjusting the parameters of the automatic control system, which is easy to operate and control.
  3. The water tank at the bottom of the cylinder is equipped with a special device, and the upper water hole is automatically closed when the water is stopped, which prevents the material in the cylinder from blocking the hole and entering the water tank.

• Trommer Screen

Inspect the finished materials from the blocked settler to prevent large particles from entering the back-end equipment and improve accuracy.

Vulnerable parts: stainless steel screen. The replacement cycle is about 14 days.

trommel screen

• Concentration Bucket

Equipment introduction: Concentrate the finished sand and reduce the slurry concentration.
Vulnerable parts: none.

• Spiral Chute

The uniform slurry is slowly fed to the surface of the spiral trough through the feed trough installed at the head end of the spiral trough for sorting. The end of the spiral groove is inserted into the valve block-type product intercepting groove, and the sorted products are radially separated according to grade size and size. The position of the regulating valve block is used to change the intercepting width of each product, and the product accumulation bucket collects the intercepted multi-head ore streams separately.
Laboratory Spiral Chute (5)

Features

  1. The spiral chute has high efficiency, high recovery rate, and accurate ore separation;
  2. Light weight, rust-proo^ wear-resistant, and corrosion-resistant;
  3. It occupies a small space, consumes less water, has a simple structure, and does not require power;
  4. Low operating cost and long service life;
  5. Strong adaptability to fluctuations in ore supply, concentration, particle size and grade;
  6. The spiral chute is inexpensive, simple to install, easy to operate, small investment, and quick return.

• Dewatering Screen

Equipment Introduction: Dehydrate the finished materials to reduce the water content of the materials.

Technical Features

  1. Professionally designed frequency, amplitude, and low-consumption power sources are suitable for 24-hour continuous dry drainage operations for various dehydration needs. V-shaped screen surface design, -5° screen surface climbing dewatering. Dry tailings have low water content, high efficiency, and large processing capacity per unit area.
  2. The polymer composite screen has a long service life, modular assembly design, convenient replacement, and cost-saving, The screen hole size can be selected according to requirements.
  3. The method of riveting and welding the section steel components constitutes a frame body with no internal stress, high strength, lightweight, and durability.

Vulnerable parts: polyurethane screen. The life span is 6-9 months.

• Thickener

The water used in the whole process is separated from mud and water so that the water source of the whole system is reused and zero discharge of wastewater is realized.

High-efficiency thickener: and adding chemicals as coagulant and flocculant to improve the precipitation effect. The load of the thickener is 4〜5t/nf d, the concentration of the underflow is controlled above 30%, and the underflow is supplied to the next-stage mud dewatering system or filter press; the solid content of the effluent of the thickener is controlled at about 100〜150’mg/L, The effluent water quality meets the requirements of beneficiation production and is all recycled to the clean water tank for use as the beneficiation production water.

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