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Method for recycling sodium molybdate solution from molybdenum contained silica slag

A sodium molybdate solution technology, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., can solve the problems of hydrochloric acid volatility and corrosion, poor slag cooking effect, large reagent consumption, etc., and achieve low environmental pollution and recycling The method is simple and the recovery cost is low

Inactive Publication Date: 2010-07-21
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main recovery methods of molybdenum in silicon slag are: sodium hydroxide alkali boiling method, this method is to use sodium hydroxide and insoluble magnesium molybdate precipitation reaction, so that the insoluble magnesium molybdate precipitation is transformed into soluble sodium molybdate solution and then Reclaim molybdenum, but in fact, because the solubility product of magnesium molybdate precipitation and the solubility product of magnesium hydroxide (the solubility product of magnesium hydroxide is 1.8 * 10 -11 ) is relatively close, and the result is that the final slag cooking effect is poor, and the yield of molybdenum is often only about 50%; the sodium carbonate sintering method is to use soda to decompose insoluble magnesium molybdate at 700-750 ° C to generate molybdenum acid Sodium, this method has a high leaching rate, but high energy consumption and large reagent consumption; acid decomposition method, this method is to use 20% to 30% hydrochloric acid to decompose silicon slag, this method has the volatility and serious corrosion of hydrochloric acid, and needs to be recycled Molybdenum in hydrochloric acid decomposition solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the step of reclaiming sodium molybdate solution in molybdenum-containing silicon slag is as follows:

[0012] A. Batching and pulping: first calculate the weight of dry silicon slag from 268.9kg of purified silicon slag containing 27.95wt% molybdenum (wet silicon slag moisture 64.3%, equivalent to 96kg of dry silicon slag), add 1.5m 3 (1500kg) after the water is stirred and mixed evenly, adding concentration is that 24.2kg of phosphoric acid 24.2kg of 85wt% is fully stirred evenly, and the specific gravity of its final slurry is 1.34g / cm 3 , the resulting slurry is ready for use;

[0013] B. Heating reaction: heat and stir the slurry obtained in step A, and slowly add sodium hydroxide solution at the same time, control the pH value of the slurry at 9.5 to 10, and boil for 2.0 hours;

[0014] C. Solid-liquid separation: the material after the heating reaction in step B is sent to the centrifugal filter for filtration, and the Mo content is 19.4g / l, and th...

Embodiment 2

[0016] Embodiment 2: the step of reclaiming sodium molybdate solution in molybdenum-containing silicon slag is as follows:

[0017] A. Batching and pulping: 121.1kg of purified silicon slag dry residue containing 22.01wt% molybdenum, 2.0m of filter residue washing liquid after solid-liquid separation containing 1.2g / liter of molybdenum 3 Add 20.5kg of phosphoric acid with a concentration of 85% into the reaction tank, stir and mix evenly, and the specific gravity is 1.32g / cm 3 , the resulting slurry is ready for use;

[0018] B. heating reaction: the above-mentioned obtained slurry is heated under stirring conditions, and the pH value of the slurry is controlled at about 9 by adding sodium hydroxide solution at the same time, and the reaction is boiled for 3 hours;

[0019] C. Solid-liquid separation: send it to a plate and frame filter press for filtration, and obtain a sodium molybdate solution with a Mo content of 14.7g / l and a P of 0.008g / l. 3 ; Filter residue with 2m 3...

Embodiment 3

[0021] Embodiment 3: the step of reclaiming sodium molybdate solution in molybdenum-containing silicon slag is as follows:

[0022] A. Batching and pulping: first add 98.8kg of purified silicon slag dry residue containing 16.76wt% molybdenum, and then add 2.0m of filter residue washing solution containing 1.8g / liter of molybdenum after solid-liquid separation 3 and 22.0kg of phosphoric acid with a concentration of 85%, placed in the reaction tank, stirred and mixed evenly to obtain a specific gravity of 1.27g / cm 3 ;

[0023] B. Heating reaction: Slowly add sodium hydroxide solution under stirring and heating conditions, control the pH value of the slurry within the range of 9.0 to 9.5, and boil for 2 hours;

[0024] C. Solid-liquid separation: through pressure filtration solid-liquid separation, Mo content is 9.8g / l, P is 0.012g / l sodium molybdate solution 1.8m 3 , the solution can be used as a raw material solution for subsequent production; the filter residue after 2.0m 3...

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Abstract

The invention belongs to a method for recycling a sodium molybdate solution from purified molybdenum contained silica slag in the molybdenum smelting process, which comprises the steps of mixing and pulping the molybdenum contained silica slag, water and phosphoric acid, undergoing boiling reaction under the condition of controlling the pH value of pulp; and then carrying out solid-liquid separation and cleaning to obtain the sodium molybdate solution. In the invention, only the phosphoric acid is used as a disintegrant of insoluble molybdate, and the reaction is conducted at boiling temperature and normal pressure, thus more than 95% of molybdenum can be recycled from the slag in a form of sodium molybdate solution. The invention has the characteristics of simple recycling method, high efficiency, no waste water exhaust, low recycling cost and the like.

Description

technical field [0001] The invention belongs to a method for recovering sodium molybdate solution from molybdenum-containing silicon slag (purification slag) produced in the molybdenum wet smelting process. Background technique [0002] The hydrometallurgy of molybdenum at home and abroad is mainly divided into ammonia leaching-acid precipitation method and alkali leaching-ion exchange method. The alkali leaching-ion exchange method is used, and the sodium molybdate solution must be purified before ion exchange, that is, molybdenum calcine Alkali leaching is used to adjust the acidity of the obtained crude sodium molybdate solution and then add magnesium salt to remove phosphorus and silicon. In fact, this purification process often adds excessive magnesium salt, so that a large amount of molybdenum-containing silicon slag will be produced. The main forms of molybdenum in the slag are sodium molybdate adsorbed by silicon slag, magnesium molybdate precipitation produced by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
Inventor 兰时林何玉超
Owner ZIGONG CEMENTED CARBIDE CORP
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