A method for extracting tungsten from tungsten-containing raw materials by using hydrous sodium silicate

A technology of hydrous sodium silicate and raw materials, which is applied in the extraction of tungsten, using hydrous sodium silicate to extract tungsten from tungsten-containing raw materials, can solve problems such as the difficulty of extracting tungsten resources, and achieve the benefits of large-scale production and application, and the contact area Increase and prevent the effect of secondary generation

Active Publication Date: 2022-04-26
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the defect that traditional tungsten ore smelting methods in the prior art are difficult to extract tungsten resources from non-traditional low-grade tungsten ores, the purpose of the present invention is to provide a method of using aqueous sodium silicate to pyrolyze tungsten-containing raw materials to extract tungsten ore that is difficult to leach. A method for efficiently converting sodium tungstate into easily leached sodium tungstate and realizing the recovery of tungsten resources. This method is not only suitable for the recovery of tungsten resources in traditional tungsten ores such as scheelite concentrate, black tungsten concentrate, and black and white tungsten mixed concentrate, but also for tungsten Low-grade tungsten ores such as ore dressing, tungsten smelting slag, waste tungsten catalysts, and tungsten-containing waste alloys can also obtain good tungsten recovery effects, which overcomes the defect that the existing technology is difficult to extract tungsten resources from non-traditional low-grade tungsten ores.

Method used

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  • A method for extracting tungsten from tungsten-containing raw materials by using hydrous sodium silicate
  • A method for extracting tungsten from tungsten-containing raw materials by using hydrous sodium silicate
  • A method for extracting tungsten from tungsten-containing raw materials by using hydrous sodium silicate

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Effect test

Embodiment 1

[0028] The principle process of a black / scheelite concentrator is as follows figure 2 As shown, the black and white tungsten concentrates in the concentrator all meet the concentrate standard, but the tungsten medium ore products are difficult to meet the metallurgical requirements due to their fine particle size, so they are piled up in warehouses; in addition, the existing black and white tungsten ore metallurgy is usually Separated, so a large number of magnetic separators are needed in the concentrator to separate the black / scheelite concentrate by magnetic separation.

[0029] Utilize the method of the present invention to adopt hydrous sodium silicate as tungsten ore decomposition reagent, carry out sodiumization roasting and water immersion test to scheelite concentrate, black tungsten concentrate, black / scheelite mixed concentrate and tungsten middle ore respectively, concrete operation The steps are as follows: First, mix the sodium silicate with water and the tungst...

Embodiment 2

[0041] A tungsten smelter produces ammonium paratungstate by alkaline pressure cooking, a large amount of tungsten slag will be produced during the alkaline leaching process, and WO in tungsten slag 3 The content fluctuates between 1% and 3%, and the tungsten slag is corrosion slag with extremely fine particle size, and the traditional dressing and smelting process cannot effectively extract the tungsten element.

[0042] Take WO 3 The tungsten slag with a content of 1.1% is mixed evenly with sodium metasilicate nonahydrate according to the mass ratio of 1:0.3, ground to less than 74 μm, dehydrated at 200°C for 5 minutes, and then heated to 850°C and roasted for 30 minutes, the roasted material is ground Put it into water for leaching to less than 45μm, according to the liquid-solid ratio of 2:1, the leaching temperature is 50°C, the leaching stirring time is 30 minutes, and the sodium tungstate leaching solution with a leaching rate of 95.8% is obtained by filtration, and the...

Embodiment 3

[0050] Take a tungsten-containing waste catalyst with a W content of 4.3% and sodium metasilicate nonahydrate, mix evenly according to the mass ratio of 1:0.4, grind to less than 74 μm, dehydrate at 200 ° C for 5 minutes, continue to heat up to 700 ° C and roast for 15 minutes , Grind the calcined material to less than 45μm and put it into water for leaching. According to the liquid-solid ratio of 4:1, the leaching temperature is 80°C, the leaching stirring time is 30 minutes, and the sodium tungstate leaching solution with a leaching rate of 98.4% is obtained by filtration.

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Abstract

The invention discloses a method for extracting tungsten from tungsten-containing raw materials by using hydrous sodium silicate. After mixing and grinding the tungsten-containing material and hydrous sodium silicate, first roasting and dehydrating is carried out, and then high-temperature sintering is carried out, and the obtained sintered material is leached by water. , to obtain sodium tungstate solution. This method requires extremely low tungsten content in tungsten-containing raw materials, WO 3 High-efficiency decomposition and extraction can still be accomplished with a grade as low as 0.5%, and it can process low-grade black / scheelite concentrate, tungsten smelting slag, tungsten-containing catalyst, tungsten-containing waste alloy, etc., which greatly reduces the traditional tungsten extraction method. High requirements for tungsten content in tungsten-containing materials.

Description

technical field [0001] The invention relates to a tungsten extraction method, in particular to a method for extracting tungsten from tungsten-containing raw materials by using hydrous sodium silicate, and belongs to the technical field of tungsten ore smelting. Background technique [0002] To extract the tungsten element from the tungsten-containing material, it is usually necessary to first enrich the tungsten element by physical separation, and then decompose and extract the tungsten element with a decomposition reagent. For example, in the traditional dressing and smelting process, black / scheelite concentrates are obtained from raw ores containing black / scheelite through gravity separation / magnetic separation / flotation and other physical separation processes, and these black / scheelite concentrates are sent to tungsten smelters After that, the tungsten element in the tungsten concentrate is converted into sodium tungstate / tungstic acid / phosphotungstic acid, etc. by alkali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/36C22B1/02C22B1/16C22B3/04C22B7/00
CPCC22B34/36C22B1/02C22B1/16C22B3/04C22B7/001C22B7/006C22B7/009Y02P10/20
Inventor 孙伟胡岳华刘航陈攀韩海生杨磊
Owner CENT SOUTH UNIV
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