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Method for extracting tungsten and molybdenum by decomposing high-molybdenum scheelite

A technology of scheelite and tungstic acid, applied in chemical instruments and methods, tungsten compounds, improvement of process efficiency, etc., can solve problems such as harsh working environment, volatilization of hydrochloric acid, and unnecessary use, and achieves overcoming influence, reducing burden, and simple operation. Effect

Inactive Publication Date: 2019-04-16
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, hydrochloric acid volatilization and corrosion problems are serious during operation, and the working environment is harsh, so it is basically not used at present.

Method used

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  • Method for extracting tungsten and molybdenum by decomposing high-molybdenum scheelite
  • Method for extracting tungsten and molybdenum by decomposing high-molybdenum scheelite
  • Method for extracting tungsten and molybdenum by decomposing high-molybdenum scheelite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] High molybdenum scheelite (containing WO 3 51%, Mo 3.5%) into the prepared mixed solution, control the H 2 SO 4 The concentration is 2.5mol / L, H 2 o 2 The concentration is 3.0mol / L, the leaching temperature is 55°C, the leaching time is 2h, and the liquid-solid ratio is 8:1. The leaching rates of tungsten and molybdenum are divided into 98.2% and 98.5%. Characterize it, XRD figure and SEM picture are as follows figure 2 , as shown in 3. The filtrate uses 30% TBP+70% sulfonated kerosene, and extracts molybdenum according to O / A=1. The extraction rate of molybdenum is 93.4%, and the extraction rate of tungsten is 1.1%. The loaded organic phase is back-extracted with ammonia water to obtain crude ammonium molybdate solution. The raffinate was thermally decomposed at 90°C, and the precipitation rate of tungsten was 99.2%. The XRD and SEM spectra of the decomposition products are as follows: Figure 4 , as shown in 5. The mother liquor is supplemented with sulfuric ...

Embodiment 2

[0026] High molybdenum scheelite (containing WO 3 56%, Mo 4.5%) was added to the prepared mixed solution, and the H 2 SO 4 The concentration is 3.0mol / L, H 2 o 2 The concentration is 3.5mol / L, the leaching temperature is 50℃, the leaching time is 3h, the liquid-solid ratio is 6:1, the leaching rates of tungsten and molybdenum are 98.5% and 98.9%, and after filtration and washing, the filter cake is washed three times with pure water to obtain leaching residue. The filtrate uses 30% N235+70% sulfonated kerosene to extract molybdenum according to O / A=2, the extraction rate of molybdenum is 94.8%, and the extraction rate of tungsten is 0.9%. The raffinate is thermally decomposed at 95°C, and the precipitation rate of tungsten is 99.5%. The mother liquor is added with sulfuric acid and hydrogen peroxide to the initial concentration and then returns to leaching. The powdery tungstic acid obtained by thermal decomposition is subjected to ammonia dissolution-impurity removal-eva...

Embodiment 3

[0028] High molybdenum scheelite (containing WO 3 43%, Mo 5.1%) was added to the prepared mixed solution to control the H 2 SO 4 The concentration is 2.5mol / L, H 2 o 2 The concentration is 2.5mol / L, the leaching temperature is 60°C, the leaching time is 2h, and the liquid-solid ratio is 7:1. The leaching rates of tungsten and molybdenum are 99.2% and 99.1%. The filtrate uses 35% TBP+65% sulfonated kerosene, O / A=1:2 to extract molybdenum, the extraction rate of molybdenum is 94.8%, and the extraction rate of tungsten is 1.2%. The loaded organic phase is back-extracted with ammonia water to obtain crude ammonium molybdate solution . The raffinate was passed through SO at 40°C 2 Gas, the precipitation rate of tungsten is 99.0%, and the mother liquor is added with sulfuric acid and hydrogen peroxide to the initial concentration and then returns to leaching. The powdery tungstic acid obtained by thermal decomposition is subjected to ammonia dissolution-impurity removal-evapo...

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Abstract

The invention discloses a method for extracting tungsten and molybdenum by decomposing high-molybdenum scheelite. The method comprises the steps that a sulfuric acid-hydrogen peroxide mixed solution is prepared, the high-molybdenum scheelite is added into a reactor to be decomposed after the temperature rises to the temperature needed by reacting, filtrate obtained after reacting is subjected to the processes of molybdenum extraction, reverse extraction, impurity removal and the like to obtain ammonium paramolybdate, raffinate is decomposed at high temperature or reduced through SO2 to obtainpowdery tungstic acid, mother liquid is added into hydrogen peroxide and sulfuric acid till the initial concentration is obtained and then returns to the leaching process, the tungstic acid is subjected to the processes of ammonia neutralization, impurity removal and the like, and then ammonium paratungstate is obtained. According to the method, efficient normal-pressure leaching of the high-molybdenum scheelite is achieved, no impurity is introduced in the leaching process, energy sources are saved, the subsequent purification burden is reduced, and the tungsten and molybdenum leaching rate in the leaching process can reach 98% or above; molybdenum extraction can be achieved without adding a reagent in the tungsten and molybdenum separating process, and the separating efficiency is high;the thermal decomposition or reduction process achieves the impurity removal effect, the content of produced tungstic acid impurities is low, a leaching agent can be cyclically used, and the leachingcost and wastewater drainage are reduced; and the technological process is easy to operate.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy and relates to a new method for decomposing high-molybdenum scheelite to extract tungsten and molybdenum. technical background [0002] my country is the world's largest tungsten-producing country, ranking first in the world in terms of tungsten reserves, product output, export volume and consumption, and holds the dominance of the world's tungsten market. Although my country is rich in tungsten resources, it has long relied on high-quality black tungsten resources that are easy to smelt and smelt, resulting in a small amount of reserves. At present, scheelite has an absolute advantage. However, my country's scheelite has low grade, few rich ore, and complex composition of ore deposits. There are more than 30 kinds of associated components, mainly including tin, molybdenum, bismuth, lead, zinc, rare earth, fluorite and so on. Among them, molybdenum and tungsten exist in scheelite in the same ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B34/34C22B34/36C22B3/40C01G41/00
CPCC01G41/00C22B3/08C22B34/34C22B34/36C22B3/409Y02P10/20
Inventor 张文娟王成彦马保中
Owner UNIV OF SCI & TECH BEIJING
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