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Clean process for comprehensively recovering diamond and various metal resources from waste diamond tools

A diamond tool and diamond technology, applied in the field of cleaning technology, can solve problems such as poor environment, low recovery rate, and low comprehensive utilization rate, and achieve the effects of cost reduction, efficient recovery, and low cost

Active Publication Date: 2015-09-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at a series of defects such as poor environment and low comprehensive utilization rate in the existing waste diamond (tungsten carbide) tool processing technology, the purpose of the present invention is to provide a clean and environmentally friendly, high comprehensive recovery rate, short process flow, simple operation, and low cost. Low-cost cleaning process for comprehensive recovery of diamond (tungsten carbide), iron, copper, nickel, tin, etc. from waste diamond (tungsten carbide) tools; this process effectively overcomes the problems of long process, low recovery rate and heavy pollution in the existing technology At present, it is possible to cleanly recover diamond (tungsten carbide), iron, copper, nickel, tin, etc. from waste diamond (tungsten carbide) tools, so as to achieve the purpose of energy saving, emission reduction, consumption reduction and value-added

Method used

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  • Clean process for comprehensively recovering diamond and various metal resources from waste diamond tools

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The composition of the waste diamond segment provided by a company in Yunnan is: Fe 82.5%, Cu 9.2%, Sn 2.1%, Ni 1.8%, C 2%.

[0040] Get above-mentioned discarded diamond cutter head 100g, in containing FeCl 3 -Dissolve in the HCl system, the dissolution temperature is controlled at 40°C, and the pH value of the solution at the end of the dissolution is controlled at 2, Fe 3+ / (Fe 2+ +Fe 3+ ) = 0.08. Afterwards, separate by filtration, combine the washing liquid and the filtrate, dry and weigh the filter residue. The iron, copper, tin and nickel contents in the filtrate and filter residue were analyzed, and the leaching rates of iron, copper, tin and nickel were all above 99.6%, and the diamond powder yield was close to 100%.

[0041] The leaching solution is reduced by pulse electric enhanced replacement, the pulse frequency of the pulse electric field is 500Hz, the duty cycle is 50%, and the pulse average current density is 200A / m. 2 ; The replacement temperature...

Embodiment 2

[0044] The composition of discarded tungsten carbide cutter heads provided by a company in Hunan is: Fe 75.5%, Cu 13.4%, Sn 4.6%, Ni 2.1%, WC 3.7%.

[0045] Get above-mentioned discarded tungsten carbide cutter head 500g, in containing FeCl 3 -Dissolve in the HCl system, the dissolution temperature is controlled at 30°C, and the pH value of the solution at the end of the dissolution is controlled at 1, Fe 3+ / (Fe 2+ +Fe 3+ ) = 0.1. Afterwards, separate by filtration, combine the washing liquid and the filtrate, dry and weigh the filter residue. The iron, copper, tin and nickel contents in the filtrate and filter residue were analyzed, and the leaching rates of iron, copper, tin and nickel were all above 99%, and the yield of tungsten carbide powder was close to 100%.

[0046] The leaching solution is reduced by pulse electric enhanced displacement. When pulse electric enhanced displacement, the pulse frequency of the pulse electric field is 1000Hz, the duty cycle is 70%, a...

Embodiment 3

[0049] The composition of the waste diamond and tungsten carbide cutter head mixture provided by a company in Hunan is: Fe 79.0%, Cu 10.4%, Sn 4.6%, Ni 2.1%, WC 1.8%, C 2.1%.

[0050] Get above-mentioned discarded diamond and tungsten carbide mixed cutter head 2500g, in FeCl-containing 3 -Dissolve in the HCl system, the dissolution temperature is controlled at 60°C, and the pH value of the solution at the end of the dissolution is controlled at 2, Fe 3+ / (Fe 2+ +Fe 3+ ) = 0.09. Afterwards, separate by filtration, combine the washing liquid and the filtrate, dry and weigh the filter residue. Analysis of the iron, copper, tin and nickel contents in the filtrate and filter residue shows that the leaching rates of iron, copper, tin and nickel are all above 97.5%, and the yields of tungsten carbide powder and diamond powder are close to 100%.

[0051] The leaching solution is reduced by pulse electric enhanced displacement. When the pulse electric enhanced displacement is perfo...

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Abstract

The invention discloses a clean process for comprehensively recovering diamond and various metal resources from waste diamond tools. According to the process, firstly, the waste diamond (tungsten carbide) tools are efficiently dissolved to obtain diamond (tungsten carbide) powder and an iron-containing leachate, and valuable elements copper and tin in the leachate are reduced into replacement slag by use of a pulse electro-intensified replacement method. Iron is recovered from the purified liquid by use of an out-field coupled diaphragm electrodeposition. The process has the advantages that the process flow is of closed-loop circulation, the oxidant is recyclable, and the common problems of existing NOx toxic gases, environmental pollution caused by acidic liquid, low metal recovery rate and the like of the traditional waste diamond (tungsten carbide) tool treatment process are solved; the process is applicable to various waste iron-based diamond (tungsten carbide) tools, waste iron-based hard alloys and the like, and has the outstanding advantages of high raw material adaptability, simple process flow, high valuable element recovery rate, cleanness and environmental protection.

Description

technical field [0001] The invention relates to a cleaning process for comprehensively recovering diamond (tungsten carbide), iron, copper, nickel, tin and other metal resources from waste diamond (tungsten carbide) cutters, belonging to the field of hydrometallurgy. Background technique [0002] Diamond (tungsten carbide) cutter head is the working body of diamond (tungsten carbide) saw blade, which is widely used in stone processing, mainly composed of diamond (tungsten carbide) particles and matrix binder. The diamond (tungsten carbide) particles in the cutter head are a kind of superhard material, which mainly plays a cutting role; the matrix binder is to protect the diamond (tungsten carbide) particles from falling off prematurely. In order to increase the cutting effect of the diamond (tungsten carbide) cutter head and prolong its service life, for different cutting objects, matrix materials composed of different metals are often used, which can be divided into iron-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02
Inventor 杨建广彭思尧吕元录雷杰史伟强
Owner CENT SOUTH UNIV
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