Method for recycling boron carbide from sapphire ground waste materials

A technology for grinding waste and sapphire, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of volatile organic matter, lengthy process, and inability to achieve, and achieve the effect of reducing pollutant emissions

Inactive Publication Date: 2018-05-04
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boron carbide recovery rate of this technical method reaches more than 80%, but the recovered boron carbide is not high in purity, especially a small amount of silicon carbide mixed in the slurry is not removed, and a large amount of organic matter is used in the process, which is volatile, and the process is lengthy and difficult to operate. industrial application
[0006] In addition, the grinding section of domestic sapphire processing enterprises does not strictly recycle waste abrasives in sections, but directly mixes them together, which results in different impurities mixed in by different manufacturers or different grinding sections, and the content varies greatly; Physical classification has been unable to completely remove impurity powder, such as entrained silicon carbide powder, because its physical and chemical properties are close to those of boron carbide, physical separation technology is more difficult to remove

Method used

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  • Method for recycling boron carbide from sapphire ground waste materials
  • Method for recycling boron carbide from sapphire ground waste materials
  • Method for recycling boron carbide from sapphire ground waste materials

Examples

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Effect test

Embodiment 1

[0049] The grinding waste of a sapphire glass cover in Nanjing was used as the grinding waste of sapphire.

[0050] Because the sapphire grinding waste is in the form of mixed slurry, it can be filtered and dried at 100°C for 6 hours, and then sampled to detect its chemical composition. The results are shown in Table 1.

[0051] Table 1 Main composition of sapphire grinding waste

[0052]

[0053] The method for recycling boron carbide from sapphire grinding waste in this embodiment will be described in detail below.

[0054] First, pass the sapphire grinding waste through a 200-mesh standard sieve to remove large particles of sand and stones, and then filter and dry; then, use a magnetic separation belt to remove iron impurities; the third step, use concentrated hydrochloric acid with a volume ratio of 1:1 Mix it with concentrated nitric acid to prepare an acidizing medium, add the dried sapphire grinding waste after removing iron impurities into the acidizing tank, seal ...

Embodiment 2

[0062] The mixed grinding waste from a new material processing factory in Changzhou was used as the sapphire grinding waste.

[0063] Because the sapphire grinding waste is in the form of mixed slurry, it can be filtered and dried at 100°C for 6 hours, and then sampled to detect its chemical composition. The results are shown in Table 3.

[0064] Table 3 Main composition of sapphire grinding waste

[0065]

[0066] The method for recycling boron carbide from sapphire grinding waste in this embodiment will be described in detail below.

[0067] First, pass the sapphire grinding waste through a 200-mesh standard sieve to remove large particles of sand and stones, and then filter and dry; then, use a magnetic separation belt to remove iron impurities; the third step, use concentrated hydrochloric acid and concentrated nitric acid as the acidification medium , together with the dried sapphire grinding waste after removing iron impurities, was added to the acidification tank, a...

Embodiment 3

[0075] A waste abrasive from a sapphire processing enterprise in Chongqing was used as sapphire grinding waste.

[0076] Because the sapphire grinding waste is in the form of mixed slurry and mixed with other irrelevant impurities, it can be sieved with a 200-mesh standard sieve to remove large particles of impurities and fibers, and then dry the undersize at 100°C for 10 hours , sampling and testing chemical composition, the results are shown in Table 5.

[0077] Table 5 Main composition of sapphire grinding waste

[0078]

[0079] The method for recycling boron carbide from sapphire grinding waste in this embodiment will be described in detail below.

[0080] First, the sapphire grinding waste is passed through a 200-mesh standard sieve to remove large particles of sand, fibers, plastics and other sundries, then filter and dry; then, use a magnetic separation belt to remove iron impurities; the third step is to use a volume ratio of 1: Mix 1 concentrated sulfuric acid a...

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Abstract

The invention discloses a method for recycling boron carbide from sapphire ground waste materials. The method comprises the following steps: S1, sieving the sapphire ground waste materials through a 200-mesh sieve, so as to obtain a magnetic separation material; S2, performing magnetic separation on the magnetic separation material, so as to remove iron impurities and obtain an acid dissolution material; S3, putting the acid dissolution material into a acidification medium, so as to perform acid dissolution on the acid dissolution material, removing silicon impurity, and performing solid-liquid separation, so as to obtain a sintering material; S4, mixing and grinding the sintering material and an alkaline medium, and performing sintering for 4h to 48h at 300 DEG C to 800 DEG C, so as to obtain a sintered product; S5, performing water dissolution, solid-liquid separation and drying on the sintered product, so as to obtain boron carbide. According to the method, recycling of boron carbide ultrafine powder in the sapphire ground waste material is realized, resources and energy consumption are greatly saved, the recycled boron carbide meets the requirement on a grinding material and can be directly used, and the recycle rate of the boron carbide ultrafine powder reaches 93 percent or more.

Description

technical field [0001] The invention belongs to the technical field of recycling grinding waste, and in particular relates to a method for recycling boron carbide from sapphire grinding waste. Background technique [0002] Boron carbide has a hard black shiny crystal, the hardness is lower than industrial diamond, but higher than silicon carbide; compared with most pottery, boron carbide is less brittle, has strong chemical resistance, and is not corroded by hot hydrogen fluoride and nitric acid. Soluble in molten alkali, insoluble in water and acid. Boron carbide is the third hardest substance after diamond and cubic boron nitride, and its price is relatively cheap, so it is widely used in the grinding and polishing process of high-hard materials such as sapphire glass coverslips. [0003] When the sapphire wafer is used as the LED substrate, the smoothness of the surface is very high, and it must be ultra-smooth and non-damaging. The quality of the device mainly depends o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/991C09K3/14
CPCC09K3/1418
Inventor 彭正军祝增虎李法强诸葛芹贾国凤上官雪慧杨国威吴康
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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