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Method for producing ammonium paratungstate from hard alloy scrap

A technology of ammonium paratungstate and cemented carbide is applied in the field of producing ammonium paratungstate by using cemented carbide waste, which can solve the problems of long processing cycle and high processing cost, and achieve the effect of reducing processing cost and shortening turnaround time.

Pending Publication Date: 2019-08-23
赣州市海龙钨钼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the grinding debris of many cemented carbide enterprises is processed into sodium tungstate, which is then used to produce APT (ammonium paratungstate), and the returned cobalt slag is processed into cobalt powder and then used to produce alloys, which has high processing costs and long processing cycles. and other shortcomings

Method used

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  • Method for producing ammonium paratungstate from hard alloy scrap

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Embodiment 1

[0028] see figure 1 , in the embodiment of the present invention, a kind of process method that adopts cemented carbide scrap to produce ammonium paratungstate comprises the following steps:

[0029] 1) Oxidation leaching

[0030] Add grinding debris to 10% dilute sulfuric acid at a liquid-solid ratio of 1:1, heat up and stir for 3 hours, and slowly add 15% hydrogen peroxide at a liquid-solid ratio of 1:10 during the reaction;

[0031] 2) Oxidation roasting

[0032] The main component of the filter residue leached by oxidation is tungsten carbide, which is placed in a rotary furnace and roasted with air at a temperature of 350°C to convert it into tungsten trioxide. At the same time, burning can remove the oily substances in the grinding debris;

[0033] 3) Ammonia leaching

[0034] Add tungsten trioxide powder and 15% ammonia water to the stainless steel reaction kettle at a solid-to-liquid ratio of 1:3, add 8% ammonium sulfide solution according to 5% of the total input a...

Embodiment 2

[0041] see figure 1 , in the embodiment of the present invention, a kind of process method that adopts cemented carbide scrap to produce ammonium paratungstate comprises the following steps:

[0042] 1) Oxidation leaching

[0043] Add grinding debris to 10% dilute sulfuric acid at a liquid-solid ratio of 1:1, heat up and stir for 3 hours, and slowly add 15% hydrogen peroxide at a liquid-solid ratio of 1:10 during the reaction;

[0044] 2) Oxidation roasting

[0045] The main component of the filter residue leached by oxidation is tungsten carbide, which is placed in a rotary furnace and roasted with air at a temperature of 350°C to convert it into tungsten trioxide. At the same time, burning can remove the oily substances in the grinding debris;

[0046] 3) Ammonia leaching

[0047] Add tungsten trioxide powder and 15% ammonia water to the stainless steel reaction kettle according to the solid-to-liquid ratio of 1:3, add 8% ammonium sulfide solution according to 5% of the t...

Embodiment 3

[0054] see figure 1 , in the embodiment of the present invention, a kind of process method that adopts cemented carbide scrap to produce ammonium paratungstate comprises the following steps:

[0055] 1) Oxidation leaching

[0056] Add grinding debris to 10% dilute sulfuric acid at a liquid-solid ratio of 1:1, heat up and stir for 3 hours, and slowly add 15% hydrogen peroxide at a liquid-solid ratio of 1:10 during the reaction;

[0057] 2) Oxidation roasting

[0058] The main component of the filter residue leached by oxidation is tungsten carbide, which is placed in a rotary furnace and roasted with air at a temperature of 350°C to convert it into tungsten trioxide. At the same time, burning can remove the oily substances in the grinding debris;

[0059] 3) Ammonia leaching

[0060] Add tungsten trioxide powder and 15% ammonia water to the stainless steel reaction kettle at a solid-to-liquid ratio of 1:3, add 8% ammonium sulfide solution according to 5% of the total input amo...

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Abstract

The invention relates to the field of ammonium paratungstate production and processing, and concretely relates to a method for producing ammonium paratungstate from hard alloy scrap. The method comprises the following steps: 1) performing oxidation leaching; 2) performing oxidation calcining; 3) performing ammonia leaching: adding tungsten trioxide powder and 15% ammonia water into a stainless steel reactor according to a solid-liquid ratio of 1:3, adding a 8% ammonium sulfide solution accounting for 5% of the total addition amount of the tungsten trioxide powder and the ammonia water, stirring and heating the obtained mixture, performing heat insulation for 3 h, cooling the mixture to room temperature, standing for clarifying for 8 h, and performing suction filtration to obtain a filtrateand insoluble residues; and 4) performing complexing acid precipitation: adding a sodium tungstate solution to 30% hydrogen peroxide according to a volume ratio of 10:1, performing stirring for 30 min, slowly adding 1 N hydrochloric acid until the free acidity of the solution is 20-25 g / L, continuously performing stirring for 30 min, adding sodium sulfite to obtain tungstic acid, performing filtration and washing, and returning the obtained product to step 3). The method can reduce the processing cost and shorten the turnaround time, and realizes the comprehensive recycling of the tungsten scrap.

Description

technical field [0001] The invention relates to the field of ammonium paratungstate production and processing, in particular to a process for producing ammonium paratungstate by using cemented carbide waste. Background technique [0002] In recent years, with the wide application of cemented carbide and the increase in demand in China, the shortage of tungsten and cobalt resources has caused the price to rise. Reusing cemented carbide waste as valuable tungsten secondary resources is an important means to solve the source of raw materials and reduce the production cost of cemented carbide. [0003] At present, the grinding debris of many cemented carbide enterprises is processed into sodium tungstate, which is then used to produce APT (ammonium paratungstate), and the returned cobalt slag is processed into cobalt powder and then used to produce alloys, which has high processing costs and long processing cycles. and other shortcomings. [0004] In order to reduce processing...

Claims

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Application Information

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IPC IPC(8): C01G41/00C22B23/00C22B7/00
CPCC01G41/00C01G41/003C22B23/043C22B7/007Y02P10/20
Inventor 曾庆宁谢远乐
Owner 赣州市海龙钨钼有限公司
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