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Purification process of waste liquid produced by boron carbide grinding sapphire

A technology of boron carbide and sapphire, which is applied in the field of waste liquid purification technology, can solve the problems of unfavorable recycling, increased equipment investment, and influence on alkali washing and purification, and achieves the effects of short production cycle, high purification rate and reduced operation difficulty

Active Publication Date: 2018-01-09
玉溪恒宇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above process is mainly used to treat oily boron carbide grinding liquid, and it also introduces a viscosity reducer, which needs to be added twice, thus introducing new ingredients, which is not conducive to later recycling and easy to introduce new impurities
Moreover, the use of ultrasonic cleaning machines increases the investment in equipment. At the same time, after pickling and iron removal, centrifugation is carried out to obtain fixed particles. If the sedimentation is too fast, it is easy to cause alumina to remain in the fixed particles, which will affect the later stage of alkali cleaning and purification.

Method used

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  • Purification process of waste liquid produced by boron carbide grinding sapphire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 Shown, the purification process of the waste liquid that boron carbide grinds sapphire produces, specifically adopt following steps to carry out,

[0032] (1) Prepare the boron carbide waste grinding solution in the No. 1 stirring tank to make a solution with a concentration of 5%~15%;

[0033] (2) Pass the boron carbide waste grinding liquid through a sieve machine equipped with a 120-mesh screen, and the solution under the sieve enters the No. 2 mixing tank;

[0034] (3) Put the solution in the No. 2 stirring tank into the hydrocyclone with a feed pressure of 0.2Mpa, and after the cyclone classification, the weight ratio of underflow and overflow material is 1.3:1;

[0035](4) Put the overflow material into pickling and alkali washing to remove impurities, the concentration of acid solution is 50%, stir for 4 hours after adding acid, wash with water 6 times until the solution is neutral; continue to add alkali to remove impurities, the concentration ...

Embodiment 2

[0042] Such as figure 1 Shown, the purification process of the waste liquid that boron carbide grinds sapphire produces, specifically adopt following steps to carry out,

[0043] (1) Dilution: Add water to the waste grinding liquid with a boron carbide particle size of 3µm~130µm, measure the concentration of the waste grinding liquid, weigh a certain weight of the boron carbide waste grinding liquid and put it into the batching tank, stir the batching tank, add water to the medium Prepare a solution with a mass concentration of 5% to 15%;

[0044] (2) Filtration: Pass the solution prepared in step (1) through a sieve machine equipped with a 200-mesh screen. The sieve machine screens out the large particles of impurities mixed in the boron carbide waste grinding liquid, and the solution under the sieve enters another stirring in the can.

[0045] (3) Cyclone classification: pump the solution stored in the stirring tank after step (2) into the hydrocyclone for cyclone classifi...

Embodiment 3

[0057] The purification process of the waste liquid produced by boron carbide grinding sapphire is carried out in the following steps,

[0058] (1) Dilution: Add water to the waste grinding liquid with a boron carbide particle size of 3µm~130µm, measure the concentration of the waste grinding liquid, weigh a certain weight of the boron carbide waste grinding liquid and put it into the batching tank, stir the batching tank, add water to the medium Prepare a solution with a mass concentration of 5% to 15%;

[0059] (2) Filtration: Pass the solution prepared in step (1) through a sieve machine equipped with a 150-mesh screen. The sieve machine screens out the large particles of impurities mixed in the boron carbide waste grinding liquid, and the solution under the sieve enters another stirring in the can.

[0060] (3) Cyclone classification: pump the solution stored in the stirring tank after step (2) into the hydrocyclone for cyclone classification. After the cyclone classifica...

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Abstract

The invention relates to recovery and purification technologies for boron carbide, in particular to a purification technology for waste liquor produced during sapphire grinding by the aid of boron carbide. The purification technology specifically comprises the following steps: (1) dilution; (2) filtration; (3) cyclone classification; (4) overflow slurry treatment; (5) alkali washing; (6) acid pickling; (7) drying: materials subjected to treatment and impurity removal in the step (6) are fed into an oven for drying, the temperature of the oven is regulated in the range of 120-150 DEG C, drying is performed for 18-24 h, and the dried materials are crushed into powder, the crushed materials are not caked, and the particle size of the crushed materials ranges from 7 mu m to 120 mu m; (8) air separation classification. The production process can be performed at the normal temperature and under the normal pressure, the production cycle is short, the classification efficiency is high, energy consumption in the production process is low, and influence on the environment is avoided.

Description

technical field [0001] The invention relates to a boron carbide recovery and purification process, in particular to a purification process for waste liquid produced by boron carbide grinding sapphire. Background technique [0002] The application of sapphire in the field of LED light sources or mobile phones requires cutting the sapphire crystal into sapphire wafers, and then thinning the sapphire through grinding and polishing. Therefore, sapphire grinding is a key link in the processing of sapphire wafers. At present, boron carbide micropowder is mainly used to grind sapphire wafers. [0003] Boron carbide, molecular formula B 4 C, is one of the hardest man-made abrasives. Boron carbide is widely used in structural materials, composite ceramics, nuclear industry, refractory materials and other fields due to its high hardness, high melting point, low density and high chemical stability. Among them, boron carbide can be used in the grinding process of sapphire wafer after...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/991
CPCC01P2004/61C01P2006/80Y02P20/10
Inventor 吴龙宇吴龙驹徐会荣代鑫景锐杨肇春
Owner 玉溪恒宇科技有限公司