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Method for combined treatment of hard alloy grinding waste and scheelite

A technology for hard alloys and grinding waste, applied in chemical instruments and methods, phosphorus compounds, non-metallic elements, etc., can solve problems such as methods to be studied

Pending Publication Date: 2022-04-19
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the method of joint treatment of cemented carbide grinding waste and scheelite remains to be studied

Method used

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  • Method for combined treatment of hard alloy grinding waste and scheelite
  • Method for combined treatment of hard alloy grinding waste and scheelite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Step 1. Weigh 1 kg of cemented carbide grinding waste, add phosphoric acid that is 1.3 times the total theoretical amount required for leaching impurity elements such as cobalt, and add an appropriate amount of water to make the liquid-solid ratio 1L:1kg, stir and mix at room temperature for leaching for 10 hours, stirring speed 200 rpm, solid-liquid separation after the reaction is completed to obtain solid slag containing tungsten carbide and leachate containing cobalt phosphate, the leaching rate of cobalt element is 96.5%.

[0049] Step 2. Add 3.5 times the amount of phosphoric acid sodium hydroxide and 1.8 L of pure water to the leach solution obtained in the above-mentioned cobalt phosphate, and stir for 2 hours at 80° C. at a stirring rate of 300 rpm. After the reaction is completed, filter while hot for solidification. The liquid is separated to obtain a solid slag containing cobalt hydroxide and an alkaline sodium phosphate solution.

[0050] Step 3. After the ...

Embodiment 2

[0053] Step 1. Weigh 1 kg of hard alloy grinding waste, add phosphoric acid twice the total theoretical amount required for leaching impurity elements such as cobalt, and add an appropriate amount of water at the same time to make the liquid-solid ratio 2L:1kg, stir and mix at room temperature for leaching for 6 hours, stirring speed 400rpm, solid-liquid separation after the reaction is completed to obtain solid slag containing tungsten carbide and leachate containing cobalt phosphate, the leaching rate of cobalt element is 98.8%.

[0054] Step 2. Add sodium hydroxide and 2.8L pure water of 4.4 times the amount of phosphoric acid added in step 1 to the leaching solution containing cobalt phosphate obtained above, stir and react at 90°C for 1h, and the stirring rate is 200rpm. After the reaction is completed, filter while hot for solidification. The liquid is separated to obtain a solid slag containing cobalt hydroxide and an alkaline sodium phosphate solution.

[0055] Step 3....

Embodiment 3

[0058] Step 1. Weigh 1 kg of cemented carbide grinding waste, add phosphoric acid that is 2.5 times the total theoretical amount required for leaching impurity elements such as cobalt, and add appropriate amount of water at the same time to make the liquid-solid ratio 2.5L:1kg, stir and mix at room temperature for leaching for 8 hours, stir The speed is 300rpm. After the reaction is completed, solid-liquid separation is performed to obtain a solid slag containing tungsten carbide and a leaching solution containing cobalt phosphate, and the leaching rate of cobalt element is 99.2%.

[0059] Step 2. Add sodium carbonate 4.9 times the amount of phosphoric acid added in step 1 and 2L of pure water to the leaching solution containing cobalt phosphate obtained above, stir and react at 85°C for 3 hours, and the stirring rate is 300rpm. After the reaction is completed, filter while hot for solid-liquid separation , to obtain solid slag containing cobalt carbonate and alkaline sodium ph...

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Abstract

The invention discloses a method for combined treatment of hard alloy grinding waste and scheelite, which comprises the following steps: stirring and mixing the hard alloy grinding waste and phosphoric acid, leaching, and carrying out solid-liquid separation to obtain solid slag containing tungsten carbide and leachate containing cobalt phosphate; the leachate and alkali liquor are stirred and mixed to react, then solid-liquid separation is conducted, and solid residues containing cobalt salt and an alkaline sodium phosphate solution are obtained; cooling the alkaline sodium phosphate solution, and performing solid-liquid separation to obtain a saturated sodium phosphate solution and sodium phosphate crystals; the scheelite and a saturated sodium phosphate solution are mixed and subjected to ball milling, obtained ore pulp, sodium phosphate crystals and water are subjected to a leaching reaction, then solid-liquid separation is conducted, and scheelite decomposition residues containing calcium phosphate and basic calcium phosphate and a solution containing crude sodium tungstate are obtained. Therefore, the hard alloy grinding waste and scheelite are circularly and efficiently decomposed through phosphoric acid-sodium phosphate, combined treatment of primary resources and secondary resources of tungsten is achieved, the production cost is reduced, and the utilization rate of the tungsten resources is increased.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal hydrometallurgy, and in particular relates to a method for jointly treating cemented carbide grinding waste and scheelite. Background technique [0002] Tungsten-based cemented carbide will produce a large amount of grinding waste during the grinding process, which contains a large amount of tungsten and a considerable amount of cobalt, as well as silicon, copper, iron, chromium, vanadium, titanium, tantalum, niobium, nickel A small amount of impurity elements and other valuable metals can be recovered to realize the comprehensive utilization of tungsten secondary resources. Based on the coexistence of multiple elements in cemented carbide grinding materials, in the wet recycling process for such waste materials, the acid leaching process can usually be used to separate tungsten from impurity elements such as cobalt, nickel and iron, so that tungsten can be converted into tungsten carbid...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B34/36C01B25/30C01B25/32
CPCC22B7/007C22B23/0415C22B23/0461C22B34/36C01B25/301C01B25/325Y02P10/20
Inventor 李倩徐国钻杨正锋许立强许礼楷傅雨许杰
Owner CHONGYI ZHANGYUAN TUNGSTEN
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