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Method for extracting diamond powder from water-based diamond liquid

A technology of diamond powder and diamond liquid, applied in the direction of diamond, etc., can solve the problems of systemic poisoning, human skin corrosion, and failure to recover diamond particles

Pending Publication Date: 2019-12-06
LENS TECH CHANGSHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the diamond powder in the water-based diamond waste liquid mainly adopts the method of vibrating sieving, and its limitation is that the diamond particles smaller and larger than the pore size cannot be recovered.
Moreover, since the cleaning process is carried out with a phosphoric acid solution at a temperature of 100-200 ° C, there are strict requirements on the heating device and the operation process, because the vapor of phosphoric acid has a strong corrosive effect on human skin and can cause systemic poisoning Phenomenon

Method used

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  • Method for extracting diamond powder from water-based diamond liquid
  • Method for extracting diamond powder from water-based diamond liquid
  • Method for extracting diamond powder from water-based diamond liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Collect the diamond waste liquid and filter it with a 500-mesh screen;

[0042] Add concentrated hydrochloric acid with a mass fraction of 24.1%, and the mass of concentrated hydrochloric acid is twice the mass of the filtered diamond waste liquid; stir for half an hour, let stand for 4 hours after fully reacting; collect the liquid enriched with diamond powder in the lower layer;

[0043] The acidified diamond powder enrichment solution was washed with water and washed with a large amount of deionized water for 3 times; after each washing and separation, the diamond powder enrichment solution in the lower layer was collected; the conductivity of deionized water was 3.05 μs / cm;

[0044] Add a sodium hydroxide solution with a volume fraction of 5% and a concentration of 2.5mol / L, the quality of the sodium hydroxide solution is 3 times that of the diamond powder enrichment solution, and then separate and collect the lower diamond powder enrichment solution;

[0045] Wash ...

Embodiment 2

[0050] Collect the diamond waste liquid and filter it with a 500-mesh screen;

[0051] Add concentrated hydrochloric acid with a mass fraction of 20.24%, and the mass of concentrated hydrochloric acid is twice the mass of the filtered diamond waste liquid; stir for half an hour, let stand for 4 hours to separate the liquid after fully reacting; collect the liquid enriched with diamond powder in the lower layer;

[0052] The acidified diamond powder enrichment solution was washed with water and washed with a large amount of deionized water for 3 times; after each washing and separation, the diamond powder enrichment solution of the lower layer was collected; the conductivity of deionized water was 3.05 μs / cm;

[0053] Adding a sodium hydroxide solution with a volume fraction of 7% and a concentration of 4mol / L, the quality of the sodium hydroxide solution is 3 times that of the diamond powder enrichment solution, and then separates and collects the lower diamond powder enrichmen...

Embodiment 3

[0059] Collect the diamond waste liquid and filter it with a 500-mesh screen;

[0060] Add concentrated hydrochloric acid with a mass fraction of 25%, and the mass of concentrated hydrochloric acid is twice the mass of the filtered diamond waste liquid; stir for half an hour, let stand for 4 hours after fully reacting; collect the liquid enriched with diamond powder in the lower layer;

[0061] The acidified diamond powder enrichment solution was washed with water and washed with a large amount of deionized water for 3 times; after each washing and separation, the diamond powder enrichment solution in the lower layer was collected; the conductivity of deionized water was 3.05 μs / cm;

[0062] Adding a sodium hydroxide solution with a volume fraction of 6% and a concentration of 2mol / L, the quality of the sodium hydroxide solution is 3 times that of the diamond powder enrichment solution, and then separates and collects the lower diamond powder enrichment solution;

[0063] Wash...

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Abstract

The invention provides a method for extracting diamond powder from water-based diamond waste liquid. The method comprises the following steps: A) filtering water-based diamond polishing liquid to remove disintegrated dental plate slag in the polishing liquid; B) adding concentrated hydrochloric acid, carrying out stirring, then performing standing for liquid separation, and carrying out suction filtration to obtain a diamond powder enriched solution, wherein the mass fraction of the concentrated hydrochloric acid is 20-25%; C) cleaning the diamond powder enrichment liquid with deionized water,then adding a sodium hydroxide solution, and carrying out an alkalization reaction; and D) cleaning the diamond powder enrichment liquid having undergone the alkalization reaction with deionized water, and then carrying out drying to obtain the diamond powder. According to the method disclosed by the invention, waste liquid can be recycled and centralizedly treated, so resources are saved, production cost is reduced, and the waste of auxiliary materials can be greatly reduced. Experimental results prove that the diamond powder recovery rate of the method is 81-85%.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a method for extracting diamond powder from aqueous diamond liquid. Background technique [0002] Diamond liquid has unique physical and chemical properties, and is used for single-sided and double-sided copper polishing of copper discs in the sapphire field. With the development of industry, the input of various auxiliary materials, the continuous increase of the output and consumption of water-based diamond liquid, the amount of waste liquid produced is considerable but has not been collected and used rationally. At the same time, the process of waste liquid loss causes environmental pollution and waste. And diamond powder is a kind of ultra-hard, highly wear-resistant, high-temperature-resistant micropowder with a large specific surface area, which is expensive and a precious resource. [0003] Aqueous diamond solution waste is produced during polishing of diamo...

Claims

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Application Information

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IPC IPC(8): C01B32/25
CPCC01B32/25
Inventor 周群飞罗彬彬
Owner LENS TECH CHANGSHA
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