A kind of purification method of diamond micropowder

A technology of diamond micropowder and purification method, which is applied in the field of diamond micropowder purification, and can solve the problem that diamond micropowder impurities cannot be effectively removed

Active Publication Date: 2020-07-14
SHENZHEN HAIMINGRUN SUPERHARD MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for purifying diamond micropowder, which aims to solve the problem that the impurities in the diamond micropowder cannot be effectively removed in the prior art

Method used

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  • A kind of purification method of diamond micropowder

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Experimental program
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Effect test

Embodiment 1

[0039] Weigh 1000g of diamond micropowder raw material to be purified and add it to a 6L reaction kettle, add the prepared mixed acid solution (the concentration of hydrochloric acid is 1.5mol / L, the concentration of nitric acid is 0.5mol / L, and the concentration of hydrofluoric acid is 3.0mol / L) 2.5L, put the lid on and seal it, place it on the external heating inverting rack, set the temperature at 180°C, invert frequency at 10 revolutions / min clockwise, and finish the reaction in 24 hours.

[0040]After the high-temperature dynamic acid leaching treatment is completed, the upper part of the acid solution is poured out after the diamond powder has settled to prevent acid-insoluble plastic particles from floating on the acid surface. Add a sufficient amount of deionized water to dilute, pour the diamond micropowder together with the diluted acid solution into the pressure filter tank, seal the tank mouth, open the vent valve, and let in high-purity nitrogen to discharge the ac...

Embodiment 2

[0042] Weigh 1000g of diamond micropowder raw material to be purified and add it into the quartz tube for high temperature chlorination, connect the ventilation and gas outlet pipes, raise the temperature to 600°C, feed high-purity hydrogen chloride gas at a rate of 5L / min, and absorb the tail gas with sodium hydroxide solution , and then continue to heat up to 1000 ° C, start timing, after 2 hours of chlorination reaction, turn off the heating power, stop feeding hydrogen chloride gas, switch to feeding high-purity nitrogen for 5 minutes, remove residual hydrogen chloride gas in the diamond powder, wait After cooling, the diamond micropowder is taken out to obtain purified diamond micropowder B.

Embodiment 3

[0044] Weigh 1000g of diamond powder A and add it into the quartz tube for high-temperature chlorination, connect the ventilation and outlet pipes, raise the temperature to 600°C, and feed high-purity hydrogen chloride gas at a rate of 5L / min. The tail gas is absorbed by sodium hydroxide solution, and then continue Raise the temperature to 1000°C and start timing. After 2 hours of chlorination reaction, turn off the heating power supply, stop feeding hydrogen chloride gas, switch to feeding high-purity nitrogen gas for 5 minutes to remove residual hydrogen chloride gas in the diamond powder, and put The diamond micropowder is taken out to obtain purified diamond micropowder C.

[0045] The diamond micropowder A after the purification, the diamond micropowder B after the purification, the diamond micropowder C after the purification and the diamond micropowder raw material are carried out element analysis, and the result is as shown in table 1:

[0046] Table 1

[0047] Unit: ...

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Abstract

The invention discloses a method for purifying diamond micro-powder. The method comprises the following steps: placing to-be-purified diamond micro-powder into an acidic solution; sealing and dynamically treating at 80-220 DEG C; taking solids and drying, thereby acquiring the diamond micro-powder treated with the acid; and performing chloridizing roasting on the diamond micro-powder treated withthe acid, thereby acquiring the purified diamond micro-powder. The method disclosed by the invention is capable of solving the problem that the impurities in the diamond micro-powder cannot be effectively removed in the prior art.

Description

technical field [0001] The invention relates to the field of diamond composite sheets, in particular to a method for purifying diamond micropowder. Background technique [0002] Diamond composite sheet is sintered by diamond micropowder and cemented carbide matrix under ultra-high temperature and high pressure conditions. The excellent performance of the diamond composite sheet is because the diamond powder forms D-D bonds under high temperature and high pressure conditions. The quality of the D-D bond formation directly determines the final performance of the diamond composite sheet. Improve the performance and stability of the product diamond compact, but this method only controls the impact of incremental impurities, but cannot eliminate the impact of stock impurities on product performance. Therefore, it is particularly important to remove impurities in diamond micropowder. However, the particle size of the micropowder used in diamond composite sheets is mostly between ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/28
Inventor 杨华黄家剑陈惠
Owner SHENZHEN HAIMINGRUN SUPERHARD MATERIALS
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