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Recovery process for valuable metals in tungsten residues

A technology for valuable metals and tungsten slag, which is applied to the recovery process of valuable metals in tungsten slag, can solve the problems of high energy consumption and large environmental pollution in pyrometallurgy, achieve good environmental benefits, reduce recycling costs, and low costs Effect

Active Publication Date: 2015-06-03
北京恒泰岩磊科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is relatively comprehensive comprehensive recovery, but pyrometallurgy consumes a lot of energy and pollutes the environment, which is not in line with the development direction of energy saving and emission reduction and clean environment production advocated now.

Method used

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  • Recovery process for valuable metals in tungsten residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 Shown, the present invention comprises the steps:

[0038] 1) Preparation of tungsten

[0039] 1) Melting material

[0040] First add hydrochloric acid with a calculated concentration of 15-25% into the tank, heat to 60°C, slowly add black and white mixed tungsten slag under stirring, after adding black and white mixed tungsten slag, add 0.2% of the first hydrochloric acid amount 15-25% hydrochloric acid about twice as much, after heating and boiling, add 20kg / t NaF, 10kg / t NaNO3; when the pH value reaches about 1.0, add 15-25% of 0.4-0.5 times the amount of hydrochloric acid for the first time Hydrochloric acid, make S:L=1:4.5, boil until the mud turns reddish brown, stop heating, continue to stir, add 2t / t of water, stir for 0.5h;

[0041] 2) Press filter

[0042] When the temperature of the material liquid prepared in step 1) is below 80°C, carry out plate and frame filter press, add water to wash after press filter, and blow dry; put the filtrat...

Embodiment 2

[0087] 1) Preparation of tungsten

[0088] 1) Melting material

[0089] Add tungsten slag to the tank body with water or acid leaching and filtered washing water under slow stirring, and the liquid-solid ratio is 1:1; steam is heated to 60°C and then added according to the mass ratio of tungsten slag and sulfuric acid 1:1.2 8% sulfuric acid, keep the reaction temperature for 1.5 hours, then add 15% to 25% HCl 0.25 times the amount of sulfuric acid, heat to boil, then add 20kg / t NaF, 10kg / t NaNO 3 ;When the pH value reaches about 1.0, put in 15-25% hydrochloric acid that is 0.4-0.5 times the amount of sulfuric acid to make S:L=1:4.5, boil until the mud turns reddish brown, stop heating, continue stirring, add water 2t / t, stirring for 0.5h; when the temperature of the feed liquid reaches 80°C, pour the feed liquid into a filter for filtration while stirring, then wash and dry it, put the filtrate in a storage tank and let it stand for at least 12 hours, and then finely filter ...

Embodiment 3

[0136] Except for 7) the step of extracting W in the step of 1) the preparation of tungsten, the other steps are the same as those in Example 1 and will not be repeated here. The specific operation of the extraction step of this embodiment is as follows:

[0137] After the finely filtered filtrate produced in step 2) is reduced, put it into the extraction tank according to O / A=1 / 20-30, stir for 2 minutes, and add a concentration of 0.01% citric acid or stearic acid, grade 4 Countercurrent extraction, then add water according to the ratio O / A=1 / 1, stir for 3 minutes, and wash in 6 stages; then add hot 2mol / L NaOH solution according to the ratio O / A=2 / 1, stir for 15-20 Minutes; 3-stage reverse extraction and countercurrent, filter the stripping solution; then add water for backwashing according to O / A=1 / 3~5, stir for 5~10 minutes, clarify, and return the water phase to alkali dissolution; then press the comparison O / A=3~5 / 1 Add 6mol / L hydrochloric acid to acidify, stir for 3~5 ...

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Abstract

The invention provides a recovery process for valuable metals in tungsten residues. The tungsten residue treatment method comprises the following steps of: boiling tungsten residues and 15%-25% of hydrochloric acid for acid dissolution, further adding NaF and sodium nitrate, and filtering to obtain filtrate after the end of the reaction; then extracting tungsten from the filtrate by adopting N235, and evaporating, crystallizing and drying a stripping solution to obtain APT (ammonium paratungstate); and performing alkali dissolution on filtration residues, and performing pressure filtration to directly recover Ta, Nb and Sn valuable metals. Tungsten, scandium, iron, manganese, tin, copper, tantalum and niobium valuable elements and the like in the tungsten residues can be comprehensively recovered, thus the recovery cost is reduced. The recovery process disclosed by the invention further has the advantages of good environmental benefits and low cost. According to the recovery process disclosed by the invention, the acid is adopted for dissolving the tungsten residues, the tungsten and the scandium are recovered under acid conditions, the other elements are simultaneously recovered, and the process is simple.

Description

technical field [0001] The invention relates to a process for recovering valuable metals in tungsten slag. Background technique [0002] The residue obtained from wolframite concentrate after alkali leaching to extract sodium tungstate is usually called tungsten slag. After decades of production, the domestic accumulation has reached more than one million tons without treatment, and new tungsten slag is produced every year. These slags not only cause a great burden to the environment, but also waste the country's non-ferrous metal resources to a large extent. Because in addition to tungsten, tungsten slag also contains iron, manganese, scandium, molybdenum, tantalum, niobium and other non-ferrous metals (see Table 1 for the content of each element in tungsten slag), which is a very rich non-ferrous metal resource. To recover non-ferrous metals from tungsten slag, the existing technological routes at home and abroad are mainly summarized as wet treatment and combined pyro-w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/04C22B3/20C22B25/06C22B34/24C22B15/00C22B47/00C22B59/00
CPCY02P10/20
Inventor 刘甲祥徐雪明
Owner 北京恒泰岩磊科技有限公司