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A kind of treatment method of by-product monocryolite when producing organosilicon

A single cryolite and processing method technology, applied in aluminum halide, aluminum fluoride and other directions, can solve problems such as environmental pollution and resource waste, and achieve the effect of reducing labor intensity and energy consumption, and reducing equipment investment

Active Publication Date: 2021-04-13
焦作市增氟科技有限公司
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

At present, the by-products are generally disposed of by stacking or burying, which causes environmental pollution and waste of resources. So far, there is no more suitable treatment method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 1kg of by-product cryolite into the reactor, start the reactor, add 70g of sodium bifluoride at one time, then add 850g of water, stir to make it react for 10 minutes, slowly add (drop) 115g concentration in 30 minutes Be the hydrofluoric acid of 40wt%, continue stirring reaction 20 minutes, at this moment reaction material color has changed into light yellow by gray black, detect and adjust the pH value of material with saturated sodium carbonate solution to be 5.6, reaction finishes, by dry box The material was dried to obtain mono-cryolite, and the purity of the mono-cryolite product was 97.2wt%.

Embodiment 2

[0026] Put 1kg of by-product cryolite into the reactor, start the reactor, add 80g of sodium bifluoride at one time, then add 880g of water, stir to make it react for 8 minutes, slowly add (drop) 130g concentration in 25 minutes Be the hydrofluoric acid of 40wt%, continue stirring reaction 18 minutes, at this moment reaction material color has changed into light yellow by gray black, detect and adjust the pH value of material with saturated sodium carbonate solution to be 5.6, reaction finishes, by dry box The material was dried to obtain mono-cryolite, and the purity of the mono-cryolite product was 96.8wt%.

Embodiment 3

[0028] Put 1kg of by-product cryolite into the reactor, start the reactor, add 92g of sodium bifluoride at one time, add 900g of water, stir to make it react for 12 minutes, slowly add (drop) 150g concentration in 30 minutes Be the hydrofluoric acid of 40wt%, continue to stir and react for 25 minutes, at this moment the color of the reaction material has changed from gray black to light yellow, detect and adjust the pH value of the material with saturated sodium carbonate solution to 5.8, the reaction finishes, and the The material was dried to obtain mono-cryolite, and the purity of the mono-cryolite product was 96.6wt%.

[0029] The treatment method of the invention can convert the aluminum impurities in the by-product mono-cryolite into mono-cryolite, the process is simple, the impurities can be utilized, and waste water and waste residue can not be generated. The purity of the obtained product (sodium tetrafluoroaluminate content) can reach more than 96% (cryolite contains...

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PUM

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Abstract

The invention belongs to the technical field of chemical production, and discloses a method for treating by-product mono-cryolite when producing organic silicon, comprising the following steps: 1) mixing by-product mono-cryolite with sodium bifluoride and water, and stirring for 5-15 minutes; 2. ) Add hydrofluoric acid dropwise to the mixture obtained in step 1), after the dropwise addition, stir the reaction for 15-30min, and then adjust the pH value of the reaction material to 5.5-6; 3) Dry the product obtained in step 2) to obtain single cryolite. The treatment method of the invention can change the by-product mono-cryolite into a directly-usable mono-cryolite product, and realize full utilization of resources in the treatment process without generating waste residue and waste water, and the steps are simple.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a treatment method for by-product monocryolite during organosilicon production. Background technique [0002] At present, crystalline silicon materials (including polycrystalline silicon and monocrystalline silicon) are the most important photovoltaic materials, with a market share of more than 90%, and will still be the mainstream material of solar cells for a long period of time in the future. [0003] Polysilicon production processes include improved Siemens method, magnesium silicide method, REC method, silane method and other synthesis processes. Compared with various processes, inorganic production processes such as the silane method have the characteristics of easy availability of raw materials, low energy consumption, low cost, and low environmental protection pressure, and are the future development direction of polysilicon. The silane required f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/54
Inventor 候国军张海龙职继珍娄宪法张江涛
Owner 焦作市增氟科技有限公司
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