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Method for extracting sodium tungstate from tungsten-containing waste material

A technology of tungsten waste and sodium tungstate, which is applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of increased processing costs, cumbersome process, and large tungsten loss, and achieve reduced equipment footprint and simplified production process Process, the effect of enhancing industrial utilization value

Inactive Publication Date: 2018-02-23
HUNAN LITIAN TUNGSTEN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is relatively cumbersome, the loss of tungsten is relatively large, and the processing cost is increased

Method used

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  • Method for extracting sodium tungstate from tungsten-containing waste material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The following steps are used to extract sodium tungstate from tungsten-containing waste:

[0026] (1) 30kg of powdery tungsten-containing waste containing 35% tungsten was prepared by mixing high-tungsten-containing waste and low-tungsten-containing waste, and its chromium content was determined to be 7% and the vanadium content to be 2%;

[0027] (2) Add 10.55kg of sodium carbonate, 1.5kg of sodium hydroxide, and 0.67kg of sodium sulfate to the powdery tungsten-containing waste and mix, then add 15kg of raffinate to make a wet material;

[0028] (3) adopt brick press machine to make described wet material into hollow brick, dry naturally;

[0029] (4) Send the dried hollow bricks into the trolley furnace, bake at 900°C for 60 minutes, and then drop to room temperature within about 240 minutes;

[0030] (5) Use a jaw crusher to break the hollow brick obtained in step (4) into blocks, add raffinate to make the liquid-solid ratio reach 0.3:1, grind with a ball mill, then...

Embodiment 2

[0032] The following steps are used to extract sodium tungstate from tungsten-containing waste:

[0033] (1) 50kg of powdery tungsten-containing waste containing 60% tungsten was prepared by mixing high-tungsten-containing waste and low-tungsten-containing waste, and its chromium content and vanadium content were determined to be 3% and 2%;

[0034] (2) Add 25kg of sodium carbonate, 5kg of sodium hydroxide, and 0.25kg of sodium sulfate to the powdery tungsten-containing waste and mix, then add 10kg of causticized liquid to make wet material;

[0035] (3) The wet material is made into a hollow brick (similar to briquette) by a lotus root coal machine, and dried naturally;

[0036] (4) Send the dried hollow bricks into the trolley furnace, bake at 600°C for 180 minutes, and then drop to room temperature within about 120 minutes;

[0037] (5) Use a jaw crusher to break the hollow brick obtained in step (4) into blocks, add raffinate to make the liquid-solid ratio reach 1:1, grin...

Embodiment 3

[0039] The following steps are used to extract sodium tungstate from tungsten-containing waste:

[0040] (1) 30kg of powdery tungsten-containing waste containing 10% tungsten was prepared by mixing high-tungsten-containing waste and low-tungsten-containing waste, and its chromium content was determined to be 1%, and the vanadium content was 0.5%;

[0041] (2) Add 6.5kg of sodium carbonate, 0.9kg of sodium hydroxide, and 0.11kg of sodium sulfate to the powdery tungsten-containing waste to mix, then add 9kg of water to make a wet material;

[0042] (3) adopt brick press machine to make described wet material into hollow brick, dry naturally;

[0043] (4) Send the dried hollow bricks into the trolley furnace, bake at 800°C for 120 minutes, and then drop to room temperature within about 200 minutes;

[0044] (5) Use a jaw crusher to break the hollow brick obtained in step (4) into blocks, add water to make the liquid-solid ratio reach 0.5:1, grind with a ball mill, then add water...

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Abstract

The invention relates to a method for extracting sodium tungstate from a tungsten-containing waste material. The method comprises the following steps: (1) preparing a tungsten-containing waste material; (2) adding sodium carbonate, sodium hydroxide and sulfate into the blocky tungsten-containing waste material, mixing, and then adding a solvent, so that a wet material is prepared; (3) making the wet material into a hollow brick, and naturally drying; (4) roasting the naturally dried hollow brick, and then cooling to room temperature; and (5) crushing into a blocky brick, adding a solvent tiilthe liquid-solid ratio reaches (0.3-1):1, grinding, then adding a solvent till the liquid-solid ratio reaches (1-6):1, leaching for 5-30 minutes at the temperature of 50-120 DEG C, and carrying out filter pressing, so that a sodium tungstate solution and cobalt slag are obtained. The method provided by the invention has the advantages that sodium tungstate can be extracted from the tungsten-containing waste material with relatively high extraction efficiency, the production technical process is simplified, land occupied by equipment is reduced, and the industrial utilization value of the tungsten-containing waste material is comprehensively improved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for extracting sodium tungstate from tungsten-containing waste by roasting causticizing liquid. Background technique [0002] Tungsten resources are strategic reserve resources and one of the protected minerals in my country. In the hydrometallurgy of tungsten, no matter which tungsten ore decomposition process is adopted, some leaching waste residue containing a small amount of tungsten will be discharged. Among the industrial wastes containing tungsten, waste slag, waste cemented carbide and waste catalyst containing tungsten in the process of tungsten smelting play an important role. Tungstic acid is a raw material for the production of metal tungsten, tungsten-containing catalysts and other chemicals. At present, the main process of extracting tungstate from tungsten-containing waste is to pickle and roast tungsten ore (tungsten-containing waste...

Claims

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Application Information

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IPC IPC(8): C01G41/00
CPCC01G41/00
Inventor 王理群田吉英徐源源杨际幸
Owner HUNAN LITIAN TUNGSTEN IND CO LTD
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