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Method for producing white carbon black by polycrystalline silicon cut waste alkali-wash waste water

A technology of alkali washing wastewater and polysilicon, which is applied in the direction of silicon oxide and silicon dioxide, can solve problems such as inability to cultivate, environmental pollution, and soil compaction, and achieve the effect of being easy to popularize and use

Active Publication Date: 2011-03-09
佛山市迈瑞思科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industry can only recycle the cutting fluid and silicon carbide, but the large amount of sodium silicate and hydrated silica contained in the alkaline washing wastewater produced by chemical cleaning and cutting waste cannot be utilized, and the wastewater is simply neutralized and filtered. After discharge, there is serious environmental pollution, and sodium silicate and hydrated silica will cause soil compaction and cannot be cultivated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get 1000 grams of polysilicon cutting waste, the chemical composition is approximately by weight percentage: 15wt% moisture, 60wt% silicon carbide, 18wt% silicon micropowder and silicon chips, iron and iron oxide 6wt%, other components 1wt%; 1000 grams of polysilicon cutting waste Add 1000 grams of hydrochloric acid aqueous solution containing HCl concentration of 15wt%, stir and react for 24 hours, place the obtained slurry in a centrifuge tube and process it with a centrifuge to settle the solid matter, pour out the reddish-brown iron-containing solution in the upper layer of the centrifuge tube, and pour out the lower layer Take out the solid matter and add 1000 grams of water to stir for 30 minutes, then carry out centrifugation and sedimentation treatment, so that it is washed five times repeatedly, and the solid sediment obtained is washed to pH=6.8 (red-brown reaction solution and subsequent acidic washing solution are acidic wastewater). Add 1000 grams of water to ...

Embodiment 2

[0033] The alkaline washing waste water obtained in Example 1 is adjusted to pH=10 with a strongly acidic cation exchange resin, and the cation exchange resin is filtered out, and the solution obtained is put into a plastic container and placed in a freezer to cool to become an ice-like solid completely, and then The ice-like solid is taken out and placed on a porous ceramic plate to thaw, and after the thawing is completed, about 60 grams of a pile of sand-like solid particles with a size of 0.05-4 mm are obtained. Put the solid particles into a container, add 1000 grams of hydrochloric acid aqueous solution with pH=1 to soak for 36 hours, then change to pure water for soaking, soak and change water for 3 times in total, dry the obtained solid particles at 105°C for 24 hours, then dry ball mill to obtain white carbon Black, Na 2 The O content is 0.01 wt%.

Embodiment 3

[0035] The alkaline washing wastewater obtained in Example 1 is adjusted to pH=8.5 with a strongly acidic cation exchange resin, and the cation exchange resin is filtered out, and then the pH value is lowered to 7.0 with hydrochloric acid, and the obtained solution is put into a plastic container and placed in a freezer Internally cool until it completely becomes an ice-like solid, and then take out the ice-like solid and put it on the filter cloth to thaw. After the thawing is completed, about 60 grams of a pile of sand-like solid particles with a particle size of 0.05-4 mm are obtained on the filter cloth. Put the solid particles into a container, add 1000 grams of pH=1 aqueous solution (the pH value is adjusted with a 1: 1 mixture of sulfuric acid and hydrochloric acid) and soak for 8 hours, then change the pure water for soaking, soak and change the water 5 times altogether, and obtain the solid particles Dry ball milling at 105°C for 24 hours to obtain white carbon black, ...

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Abstract

The invention discloses a method for producing white carbon black by polycrystalline silicon cut waste alkali-wash waste water, which not only can economically and reliably utilize silicon contents contained in alkaline waste water generated by chemically cleaning polycrystalline silicon cut waste but also can realize the zero emission of alkaline waste water and complete recovery of effective ingredients. The method comprises the following steps: (1) adjusting the pH of the alkaline waste water to 7.0-11.1; (2) removing a small quantity of suspended solid or precipitate by using a solid-liquid separation method; (3) freezing processed alkaline waste water into glacial solid, then thawing, and separating hydrated silica contained in waste water from aqueous phase in the mode of sand particles with the size of 0.05-4 mm; (4) dipping the sand particles, and washing for 3-6 times; and (5) drying the dipped and washed sand particles for 12-36 hours at the temperature of 100-110 DEG C to obtain dry sand solid particles, carrying out ball milling and obtaining the white carbon black.

Description

technical field [0001] The invention relates to the technical field of polysilicon cutting waste recycling, in particular to a method for producing white carbon black by using polysilicon cutting waste alkaline washing wastewater. Background technique [0002] In recent decades, the solar cell industry has developed rapidly, and solar cells that use various materials to achieve photoelectric conversion emerge in an endless stream, among which polycrystalline silicon solar cells have developed the most rapidly in the past ten years. At present, China has become a major producer of polysilicon solar cells, and the production of polysilicon wafers required for polysilicon solar cells consumes more than 100,000 tons of polysilicon each year. [0003] Polycrystalline silicon wafers are processed from polycrystalline silicon rods by wire cutting. The wire cutting method is to use 1200-mesh ultra-fine silicon carbide powder as the abrasive, first mix the silicon carbide abrasive a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 桂劲宁
Owner 佛山市迈瑞思科技有限公司
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