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Fluidized bed technology for processing and separating ultrafine silicon dioxide micropowder from stone processing sawn mud

A technology of ultra-fine silica and fluidized bed, applied in the direction of silica, silicon oxide, etc., can solve the problem of high price of white carbon black, achieve the effect of low price, eliminate pollution, and avoid dust pollution

Inactive Publication Date: 2015-03-04
魏强 +1
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Problems solved by technology

The relatively complicated chemical preparation process of gas phase method and precipitation method makes the price of silica relatively expensive, (the market price of gas phase silica is 42,000 to 45,000 yuan / ton, and the market price of precipitation method is 0.42 to 4,700 yuan / ton)
The price factor has become the main obstacle to the large-scale application of silica

Method used

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  • Fluidized bed technology for processing and separating ultrafine silicon dioxide micropowder from stone processing sawn mud
  • Fluidized bed technology for processing and separating ultrafine silicon dioxide micropowder from stone processing sawn mud

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Embodiment Construction

[0020] The process route selected by the patent of the present invention is: 1. Drying of sawing mud, 2. Iron removal by strong magnetic field, 3. Ultra-fine grinding, 4. Fluidized bed screening, a total of four process units. The process route is attached figure 1 .

[0021] 1 Saw slime drying unit. In order to make the operation of the following three process units go smoothly, the moisture content of the raw materials must be reduced from 12 to 15% to below 3%, and the drying unit adopts far-infrared forced exhaust continuous drying equipment;

[0022] 2 Strong magnetic field iron removal unit. Under the action of a strong electromagnetic field, a small amount of metal impurities in the raw material (about 2-3% mainly come from tool wear) is removed to meet the requirements of the products in terms of electrical insulation performance when the product is used as a reinforcing agent in rubber, plastic, glass fiber reinforced plastic and other products;

[0023] 3 Superfi...

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Abstract

The invention relates to a technology for processing and separating a nanoscale (average particle size is 2.6 microns) ultrafine silicon dioxide micropowder from industrial waste sawn mud obtained from granite machining by the fluidized bed principle. During the granite machining process, a lot of sawn mud is generated, thus leading to severe environmental pollution. According to the invention, waste is changed into wealth. During the processing and separation process, a physical method is completely adopted. Water and any acid-base chemical materials are not consumed, and any pollution is not generated. By the fluidized bed technology, the solid micropowder can be processed completely as a fluid. The whole production process is performed in totally-enclosed pipelines and containers. It is ensured that workers have a good work environment, and it is also convenient to realize automation of the whole production device. The product is the ultrafine silicon dioxide micropowder which is relatively low in price. The product can widely be applied as a filler in multiple fields such as glass fiber reinforced plastic products, anticorrosive paints, exterior wall coatings for buildings, fireproof paints and PVC and PE plastic products.

Description

(1) Technical field [0001] The patent of the present invention relates to a technique for processing and separating near-nano-scale superfine (average particle size 2.6 μm, 5000 mesh) silicon dioxide micropowder from granite processing saw mud by the principle of a fluidized bed. Saw mud is an industrial waste of stone processing. Backfilling it into farmland will cause great damage to the soil structure, and it has become a serious source of pollution in stone processing factories. The chemical composition and many physical and chemical properties of microsilica powder are the same as those of white carbon black. It can be widely used as a filling component in many fields such as rubber products, resin composite materials, coatings and glass fiber reinforced plastic products. (2) Background technology [0002] Granite is a volcanic eruptions of lava Formed after slowly cooling and solidifying underground tectonic rock , whose composition is silica Mainly, accounting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 魏强魏征
Owner 魏强
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