Comprehensive recovery method for waste iron-based diamond tool

A technology for discarding iron and funds, applied in the field of comprehensive utilization of resources, can solve the problems of a large number of toxic gases, the sneak discharge of pollutants, and the low value of recycled materials, and achieve the effects of environmental protection, shortening time, and improving efficiency.

Inactive Publication Date: 2014-12-10
陈忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The use of acid leaching process to reclaim waste diamond tools has the following defects: one, a large amount of toxic gases such as nitrogen monoxide and nitrogen dioxide will be produced in the acid leaching process, and it is easy to form acid mist; Recycling is carried out in the form of small workshops. Neither the awareness of environmental protection nor the level of technology can meet the current environmental protection requirements of our country. Most of the pollutants produced in the recycling process

Method used

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  • Comprehensive recovery method for waste iron-based diamond tool

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Wash the waste iron-based diamond tools and put them into mesh titanium blue with a size of 550mm×450*80 as the anode, and a 316L stainless steel plate with a size of 600*500*2 as the cathode (the effective area of ​​cathode electrolysis is 0.5 square meters / Block), the anode and cathode are installed in the electrolytic cell with the pole distance of 100mm. In the waste iron-based diamond tool, there are 2 wt% of diamond, 65-70 wt% of iron powder, 10-30 wt% of copper powder, 1 wt% of nickel powder, about 2-3 wt% of zinc and a trace amount of tungsten carbide.

[0041] In this embodiment, a PVC tank with a size of 800mm×800mm×700mm is used as an electrolytic tank, and a PVC tank with a size of 1000mm×1000mm×600mm is used as an electrolyte circulation tank. The circulation tank is equipped with a filter device, and the filtered electrolyte is pumped into the electrolytic tank through a circulation pump, iron is dissolved at the anode, and electrolytic iron sheets are ob...

Embodiment 2

[0051] Change the following conditions, and other conditions are the same as in Example 1;

[0052] After making liquid electrolysis until the concentration of ferrous ions in the electrolyte is 50g / L, after controlling the pH value of the reaction system to 3.0-3.5, lower the strength of the electrolytic liquid to 800A (at this time, the current density of the cathode is 400A / m2, The cell voltage is 3.2V), the circulation speed of the electrolyte is controlled at 40L / min, and the electrolytic recovery of waste diamond tools is carried out. The electrolytic recovery process takes 20 hours as a cycle, and the weight of the cathode deposit obtained in one electrolysis cycle is 15.67 kg; during the recovery process, the average current efficiency of the cathode is controlled to be 94%; the obtained cathode deposit is cleaned, dried, crushed and reduced, and then packaged for sale.

Embodiment 3

[0062] After the completion of Example 1, add waste iron-based diamond tools to the titanium anode blue to continue recycling electrolysis; control the current density of the cathode during recycling electrolysis to be 350A / m 2, the cell voltage is 2.8V, the circulation speed of the electrolyte is controlled at 50L / min, and the electrolytic recovery of waste diamond tools is carried out. The electrolytic recovery process takes 24 hours as a cycle, and the weight of the cathode deposit obtained in one electrolysis cycle is 15.40 kg; during the recovery process, the average current efficiency of the cathode is controlled to be 88%; the obtained cathode deposit is cleaned, dried, crushed and reduced, and then packaged for sale.

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Abstract

The invention relates to a comprehensive recovery method for a waste iron-based diamond tool, and belongs to the technical field of comprehensive utilization of resources. The method comprises the following steps: using the waste iron-based diamond tool as an anode, using an inert material as a cathode, and using a solution containing ferrous ions as an electrolyte; carrying out recycling and electrolyzation under the condition that the pH value is 3-6; during the recycling and electrolyzation, obtaining a cathode sediment containing hydrogen and iron in a cathode area and obtaining anode mud containing diamond in an anode area, wherein the concentration of the ferrous ions in the electrolyte is 20-50 g/L, during the recycling and electrolyzation, the cathode-current density is controlled to be 200-500 A/m <2>, the cell voltage is controlled to be 2.0-4.5V, and the current efficiency is controlled to be 80-95%, the cathode sediment is directly utilized after being dried, smashed and restored, and the anode mud is directly utilized after being dried and separated. The comprehensive recovery method has the advantages of simple technology, easy operation, environmental protection, low cost, high product value and the like, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to a method for comprehensively recycling waste iron-based diamond tools, belonging to the technical field of resource comprehensive utilization. Background technique [0002] Diamond is the hardest substance found in nature so far. It is widely used in geological drilling and hard and brittle substances, such as cutting, grinding and drilling of jewelry, stone, ceramics, hard alloys, semiconductor crystals, magnetic materials, etc. , because diamonds are all in the form of fine particles, they need to be made into tools with certain shapes and certain mechanical properties by using materials before they can be used. Diamond tools are tools of various types and specifications made of diamond as the abrasive and metal powder as the matrix through pressing and sintering processes. They are widely used in cutting, drilling, milling and other methods for stone, building materials, refractory materials, For the processing of hard and b...

Claims

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Application Information

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IPC IPC(8): C25C1/06C01B31/06
CPCY02P10/20
Inventor 陈忠
Owner 陈忠
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