Silica sand processing/washing plant technology

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Flotation machine is a special equipment for quartz sand flotation. It can effectively remove impurities such as alumina, iron and mica in the sand, obtaining high purity sand.

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A successful silica sand processing plant from sinonine!

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China's quartz sand market demand increases rapidly in 2018-2020

According to incomplete statistics, in 2015, China's Quartz sand market exceeded 20 billion yuan, including 45.53% semiconductor, 23.76% photovoltaic, 16.20% optical communication, 9.50% optical and 5.18% light source. It is estimated that the global demand for quartz materials in 2018-2020 will be 255 / 265 / 28.3 billion yuan, with growth rates of 8%, 4% and 3% respectively. With the transfer of downstream industries, China's quartz sand enterprises are gradually entering high-end application fields such as semiconductor, optical fiber, aerospace, electric light source, etc.

1) the market share of semiconductor quartz is the highest, which requires high purity of quartz. It usually needs to pass the certification of Tokyo electronics, American applied materials, Lam research, etc.

2) optical communication quartz is mainly used for optical fiber preform core, pipe sleeve and related auxiliary materials.

3) quartz fiber is mainly used as wave transmission reinforcement materials, heat insulation and high temperature resistant materials for aviation; in the future, with the launch of key engineering projects in China, the demand is expected to increase rapidly in 2018-2020.

China Huatai Securities said that considering the rapid increase of the proportion of high-end products in China's Quartz enterprises, it is gradually expanding to the application direction of high prosperity and high growth, such as semiconductor, optical communication, aerospace, etc., and it is optimistic about the production process of China's quartz materials in semiconductor support parts and optical fiber preforms, and it is suggested to pay attention to quartz shares: with high-purity quartz sand production capacity, optical fiber preform jacket The first batch of orders were obtained for the tube, and the semiconductor quartz certification was steadily promoted.

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Quality requirements and control of quartz sand for photovoltaic glass!

In nature, it is rare to find raw materials of quartz sand that can meet the requirements of glass production without treatment, especially ultra white glass, which requires more strict raw materials of quartz sand. The quality requirements of photovoltaic glass for quartz sand are mainly reflected in three aspects: chemical composition, particle size and refractory minerals.

1. Chemical composition

The biggest difference of chemical composition between photovoltaic glass and common glass is Fe2O3 content. The mass fraction of Fe2O3 is not more than 1.50x 10-4.

The amount of iron oxide in quartz sand will have a direct impact on the quality of solar glass. The content of iron oxide affects the absorption of visible light by glass, which determines the conversion energy of photovoltaic modules, and is one of the key factors to measure whether it can be used as the principle of photovoltaic glass. Iron oxide makes the glass colored and reduces the light transmittance of the glass. Fe2O3 can make the glass turn yellow; FeO can make the glass turn blue; the coexistence of the two can make the glass turn blue-green. Iron oxide has a strong absorption effect on the heat radiation of glass melting, which is easy to cause the convection difficulty of glass liquid in the furnace and increase the difficulty of melting and clarification.

2. granularity

The size of quartz sand affects the melting time of sand and the quality of glass products. Experiments show that it is difficult for coarse particles to melt, or even to become scum, which makes wave bars or sand particles appear on the products; although the melting speed of sand particles with particle size less than 0.1mm is fast, the premature formation of glass liquid affects the heat conduction, but makes the overall speed slow down. In addition, the ultra-fine particles increase the viscosity due to the electrostatic effect, which makes it easy to agglomerate, which makes it difficult to melt.

3. Refractory heavy minerals

Some refractory heavy minerals in quartz sand, such as chromite and zircon, have high melting points and stable chemical properties, which are difficult to be melted and eroded even at high temperature, so stones are easy to form on the original glass plate. It has a great influence on the quality of the original glass and the later deep processing. The total amount of chromite and nickel bearing minerals is required to be no more than 5ppm (calculated by Cr2O3), and the diameter of single particle is required to be no more than 0.25mm; for other refractory heavy minerals, the diameter of single particle is required to be no more than 0.25mm.

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Big discovery the use of silica sand powder

Silica sand powder can be used in commercial concrete, high-strength concrete, self leveling concrete, amorphous refractory, dry mixed (premixed) mortar, high-strength non shrinkage grouting material, wear-resistant industrial floor, repair mortar, polymer mortar, thermal insulation mortar, impermeable concrete, concrete compactor, concrete preservative, water mud based polymer waterproof agent; rubber, plastic, unsaturated polyester, paint, coating and other high-quality Reinforcement of molecular materials, modification of ceramic products, etc. The details are as follows:

Application of silica sand powder in mortar and concrete

Silicon micro powder can be used in high-rise buildings, seaports, dams, water conservancy, sluices, railways, highways, bridges, subways, tunnels, airport runways, concrete pavements and coal mine roadways.

Application of silicon powder in material industry

1. The service life of high-grade high-performance low cement refractory castables and prefabricated parts is three times that of ordinary castables. The fire resistance is increased by about 100 ℃, and the high-temperature strength and thermal shock resistance are significantly improved. It has been widely used in coke oven, ironmaking, steelmaking, steel rolling, non-ferrous metals, glass, ceramics and power generation industries.

2. Large iron ditch and ladle materials, permeable bricks, application of repair materials, etc.

3. Application of self flowing refractory casting material and dry wet spraying construction.

4. Oxide bonded silicon carbide products (ceramic kiln furniture, flame plate, etc.).

5. High temperature calcium silicate light heat insulation material.

6. Corundum mullite push plate for electric porcelain kiln.

7. High temperature wear-resistant materials and products.

8. Corundum and ceramic products.

9. Cylon binding products.

At present, it is widely used not only in castable refractories, but also in electric melting and sintering refractories.

Application of silica sand powder in new wall materials and facing materials

1. Silica powder can be used as polymer mortar, thermal insulation mortar and interface agent for wall insulation.

2. Silica powder can be used as cement-based polymer waterproof material.

3. Silicon powder can be used as the heat preservation and energy saving concrete and products of light aggregate.

4. Silicon powder can be used as putty powder for internal and external wall construction.

Special use of silica sand powder

1. Silica sand powder is the raw material of silicate brick.

2. Silica sand powder can produce water glass.

3. Silica sand powder is used as the reinforcing material of organic compounds.

Because the composition of silica powder is similar to that of fumed silica, silica powder can be used as filling and reinforcing material in rubber, resin, coating, paint, unsaturated polyester and other polymer materials.

4. Silicon powder is used as anti caking agent in chemical fertilizer industry.

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Classification and application of quartz sand(silica sand)

Classification of quartz sand(silica sand)

Quartz powder (silica sand) is usually divided into ordinary silica sand (powder), refined quartz sand, high-purity quartz sand, fused quartz sand and silica powder.

1. Ordinary quartz sand (powder)

SiO2 ≥ 90-99% Fe2O3 ≤ 0.06-0.02%, fire resistance 1750-1800 ℃, part of the appearance of large particles, the surface of yellow skin capsule. The granularity range is 1-320 mesh, which can be produced according to the user's requirements. Main uses: metallurgy, graphite silicon carbide, building materials, enamel, cast steel, filter material, foam alkali, chemical industry, sandblasting and other industries.

2. Refined quartz sand (powder)

It is also called acid washed quartz sand. SiO2 ≥ 99-99.5% Fe2O3 ≤ 0.02-0.015%. It is made by complex processing of high-quality ore. The particle size range is 1-380 mesh, which can be produced according to the user's requirements, with white or crystalline appearance. Main uses: filter material, advanced glass, glass products, refractory, smelting stone, precision casting, sandblasting, wheel grinding material, etc.

3. High purity quartz sand (powder)

SiO2 ≥ 99.5-99.9% Fe2O2 ≤ 0.005%. It is made of 1-3 grade natural crystal stone and high-quality natural stone through careful selection and fine processing. The particle size range is 1-0.5mm, 0.5-0.1mm, 0.1-0.01mm, 0.01-0.005mm, which can be produced according to the user's requirements. Main uses: advanced glass, electronic filler, smelting stone, precision casting, chemical industry, ceramics, etc.

4. silicon powder

SiO2: 99.5% min-99.0% min, Fe2O3: 0.02% max, Al2O3: 0.3% max, size: 200-2000 mesh, gray or gray white powder, fire resistance > 1600 ℃. Unit weight: 200-250kg / m3.

Use of quartz sand(silica sand)

Quartz sand is not divided into grades, only into specifications. Because of its high whiteness, no impurity and low iron content, it is widely used. Quartz sand can be used in the following industries:

1. Use of silica sand in glass

Main raw materials of flat glass, float glass, glass products (glass can, glass bottle, glass tube, etc.), optical glass, glass fiber, glass instrument, conductive glass, glass cloth and special radiation proof glass, etc.

2. Use of quartz sand in ceramics and refractories

Raw materials for porcelain embryo and glaze, high silicon brick for kiln, common silicon brick and silicon carbide, etc.

3. Use of quartz sand in construction

Concrete, cementitious material, road building material, artificial marble, cement physical property inspection material (i.e. cement standard sand), etc.

4. Application of quartz sand in chemical industry

Raw materials of silicon compounds and water glass, filler of sulfuric acid tower, amorphous silica powder

5. Use of quartz sand in machinery

Main raw materials and abrasives of casting sand (sand blasting, hard abrasive paper, abrasive paper, abrasive cloth, etc.)

6. Use of quartz sand in electronic industry

High purity silicon metal, optical fiber for communication, etc.

7. Use of quartz sand in rubber and plastic

Filler (improves wear resistance)

8. Application of quartz sand in coating

Filler (can improve the weather resistance of coating).

9. Application of quartz sand in metallurgy

Silicon metal, ferrosilicon alloy, silicon aluminum alloy and other raw materials or additives, fluxes.

10. Application of quartz sand in aerospace

Its inherent molecular chain structure, crystal shape and lattice change rule make it have high temperature resistance, small coefficient of thermal expansion, high insulation, corrosion resistance, piezoelectric effect, resonance effect and its unique optical properties.

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What are the applications of silica sand in the high-end technology?

The high-purity silica sand produced by the high purity silica sand processing has stable physical and chemical properties, high temperature resistance, corrosion resistance, light transmittance and good insulation. It is an indispensable material for high-end manufacturing fields such as electronic information, optical light source, photovoltaic energy, aerospace, etc.

I. application of quartz/silica sand in semiconductor

Quartz sand is an important semiconductor auxiliary material, which is widely used in semiconductor processing. Due to its special physical properties of temperature resistance, acid resistance, low expansion and excellent spectral transmittance, pure quartz sand material meets the demanding requirements of semiconductor industry for the content of alkali metals and heavy metals in carrier materials, and becomes an indispensable material in this field. Quartz sand material runs through the key manufacturing process of related products in semiconductor field: quartz crucible is used for refining, cleaning containers and making wafer IC carrier; quartz ingot and quartz cylinder are the materials of quartz flange, quartz diffusion tube and quartz bell cover used in semiconductor manufacturing diffusion, oxidation, deposition and etching process; synthetic quartz ingot is the key component of flat panel display technology photomask The main substrate of the membrane substrate.

II. Application of quartz/silica sand in optical fiber industry

Quartz sand glass material is the main auxiliary material in the production of fiber preform and fiber drawing process. The urgent growth of information flow and demand for high-capacity and efficient direct circuit has promoted the rapid development of optical fiber industry, as well as the growth of its upstream main raw material quartz preform and rod holding industry.

III. application of quartz/silica sand in photovoltaic field

Quartz sand products are widely used in the solar photovoltaic industry. The main product quartz crucible is used in the process of refining monocrystalline / polycrystalline silicon. In addition, in the production process of solar cells, various quartz sand glass materials and products are also the main process consumables. With the strong development of new energy industry, the scale of photovoltaic industry in China is growing, which also stimulates and drives the huge market demand for natural quartz products, especially quartz crucible products.

IV Application of quartz/silica sand in aerospace field

Due to a series of severe conditions, such as high strength, small dielectric constant and electric loss, high temperature resistance, low expansion coefficient and corrosion resistance, the excellent performance of quartz fiber has become one of the important materials in aerospace manufacturing industry. In the field of aviation, quartz sand material is mainly used for making wave transmission enhancement materials, including airborne radome, missile radome, interference electromagnetic launch window, etc.; in the field of aerospace, quartz sand products can be used as heat insulation and high temperature resistant materials for aerospace vehicles.

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What should I do if the output of the spiral sand washing machine is low?

As a commonly used sand washing equipment, spiral sand washing machine has a wide range of applications in quartz sand plants, construction, ore mining, glass, sand and gravel plants. If the output of the spiral stone washing machine is low during production, it will greatly affect the production efficiency of the entire line and cause losses. So, how is the low output of the spiral sand washer? How to avoid it?

What is the cause of the low output of the spiral sand washer?

The sandstone material has a large amount of mud and more impurities.

If the washed sand and gravel materials contain more impurities and dirt, it will affect the output. In order to clean the material sandstone, it takes a long time. In this case, we can consider adding one more equipment and carrying out double water washing, which can effectively improve the cleaning efficiency of the sand washing machine without slowing down. Cleanliness and yield of sand and gravel materials.

the quality of the spiral sand washing machine itself is not up to standard

Due to different manufacturing processes, different materials used, and different structural structures, the spiral sand washing machine has different yields during the working process. When the quality of the spiral sand washing machine is particularly poor, there will be a situation in which the sand and the foreign matter are not uniformly separated, resulting in a decrease in the finished product amount of the sand.

spiral stone washing machine equipment illegal operation

Whether it is a single- or double-spiral sand washer, the operation of the equipment is particularly important. Don't underestimate the skill level of the operator. Most of the production is reduced or 50% is due to equipment operation problems. It will affect the normal operation of the equipment, and even cause a significant drop in productivity. The spiral sand washing machine is composed of a tank body, a speed reducer, a motor, a central shaft, a spiral blade and a bracket. The spiral sand washer rotor has a central structure, the spiral blades are mounted on the central shaft, and a reducer is connected to the central shaft for work. An apparatus for performing mechanical extension by utilizing the principle that the specific gravity of the solid particles is different and thus the sedimentation speed in the liquid is different. Novices must keep in mind that the chute of the spiral sand washing machine should be filled with water and then added with sand and gravel for processing.

The maintenance, maintenance and maintenance of the spiral sand washing machine is not perfect.

In addition, the maintenance of the equipment is not in place, and the output will be low after using the equipment for a period of time. Therefore, in addition to the correct use of the spiral sand washer, regular maintenance is also very important!

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What types of sand washing machines are there? What are the characteristics of different types of sand washing machines?

There are many types of sand washing machines, and each has its own advantages. Here are some common sand washing machines: 1.Spiral sand washing machine The spiral sand washing machine is a kind of sand washing machine. The cleaning effect is very good, and the energy consumption is small. It is suitable for washing, grading and removing impurities in metallurgy, building materials, hydropower and other industries. It is used for construction sand and road construction. Sandstone is especially suitable. The screw sand washing machine has low power consumption, high cleaning degree, good sealing structure and full blocking drive installation, which ensures the products are efficient, durable, clean and dehydrated. 2. Wheel sand washing machine The wheel sand washing machine is a kind of washing sand washing equipment used in conjunction with the sand making machine. The wheel sand washing machine can wash the mixed sand from the sand making mechanism to remove trace amounts of stone powder and impurities, thereby further improving the sand. quality. It is mainly used for the washing, grading and dewatering of construction sand, gravel plant, hydropower station concrete dam site, post and telecommunications pole factory sand stone for casting and quartz sand for foundry, quartz sand for glass factory and quartz sand for oil well backfill. 3. Rotary scrubber The rotary scrubber uses mechanical equipment to clean the raw stone to ensure the quality of the project while ensuring sufficient productivity to meet the supply of stone to the concrete mixing station. The work flow is: raw material storage, guarantee, cleaning, scrap material delivery, sewage sedimentation and reuse.

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Attrition scrubber,useful sand washing machine

Attrition scrubber is used to scrub quartz mortar with 68-70% concentration, to scrub mud and sand on ores, to create conditions for beneficiation operation, and also to other scrubbing industries. The working principle of the scrubber is that the motor drives the spindle to rotate (clockwise from top to bottom) through the pulley. The blade produces negative pressure area. The material is fully stirred and washed after passing through, then pushed out by the blade and flows along the barrel wall. As the material is continuously fed in, the material after scrubbing is continuously discharged from the outlet to complete the cleaning work.

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Silica sand processing & Sand washing plant EPC

Silica sand processing can be used for aggregate and artificial sand production of hard limestone, granite, basalt, River pebble, smelting slag and other materials. It is suitable for the application of hydropower, building materials, highway, urban construction and other industries. Sand washing plant is especially suitable for the special construction fields such as the production and processing of expressway surface material, gravel for high-grade highway pavement, gravel aggregate for high-speed railway passenger dedicated line, gravel for hydropower station, gravel for port wharf and airport runway. The advantages of the Silica sand processing are good shape of finished sand grains, reasonable match of finished sand grade and adjustable fineness modulus. The indexes of finished sand conform to industry standards. The cost of finished sand production is low and the benefit is good. The Silica sand processing is mainly composed of vibration feeder, jaw crusher, impact crusher, vibration screen, sand making machine and belt conveyor, centralized electronic control and other equipment.