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Method for preparing ammonium molybdate from molybdenum calcine by synergistic acid leaching method

A technology of acid leaching and molybdenum calcining, applied in the field of molybdenum hydrometallurgy, can solve the problems of complex impurity removal process, complicated impurity removal process, difficult operation, etc., and achieves short preparation process, improved operating environment, and reduced energy consumption. Effect

Active Publication Date: 2017-02-22
湖南瑞友有色科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing method, leaching and purification are divided into two steps, which need to be leached by ammonia first, and then purified to remove impurities to obtain a qualified ammonium molybdate solution, or by removing impurities, and then ammonia leaching to obtain ammonium molybdate solution; the impurity removal process Complicated, different impurity removal methods are required for different impurity ions. For metal ions such as copper and zinc, sulfide precipitation method is required; for phosphorus, arsenic and silicon, magnesium salt precipitation method is required; Or ammonium molybdate products are washed with pure water or ammonium salt to remove impurities
Therefore, the problems in the existing method include: the process is long, the process of removing impurities is complicated, and the operation is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Organic phase preparation: the volume ratio is 30% P507+70% sulfonated kerosene.

[0017] Leaching: Take 50g molybdenum calcined sand (Mo, Ni, K, Na, Cu, Si, P mass percent content is 50.45, 0.055, 0.01, 0.05, 0.44, 2.33, 0.21%) and 200mL sulfuric acid with a concentration of 2mol / L , 600mL of the organic phase were mixed, stirred and leached at 20°C for 60 minutes, clarified and separated to obtain the negative molybdenum organic phase, and filtered the slurry to obtain the leaching residue and filtrate.

[0018] Stripping: Mix negative molybdenum organic phase with 3.5mol / L ammonia water, O / A=4 / 1, stir at 25°C for 10 minutes to obtain ammonium molybdate solution and empty organic phase.

[0019] Results: The mass percent content of Mo in the filter residue was 1.23%, and the Mo concentration in the filtrate was 1.20g / L. The molybdenum leaching rate was 99.51%. The concentrations of Mo, Ni, K, Na, Cu, Si, and P in the ammonium molybdate solution were respectively 255....

Embodiment 2

[0021] Organic phase preparation: the volume ratio is 30% cyanex272+70% sulfonated kerosene.

[0022] Leaching: Take 50g molybdenum calcined sand (Mo, Ni, K, Na, Cu, Si, P mass percent content is 50.45, 0.055, 0.01, 0.05, 0.44, 2.33, 0.21%) and 100ml hydrochloric acid with a concentration of 3mol / L , organic phase 650mL mixed, stirred and leached at 30°C for 30 minutes, clarified and separated to obtain a negative molybdenum organic phase, filtered the slurry to obtain leaching residue and filtrate.

[0023] Stripping: Mix negative molybdenum organic phase with 2.6mol / L ammonia water, O / A=3 / 1, stir at 25°C for 10 minutes to obtain ammonium molybdate solution and empty organic phase.

[0024] Results: The mass percent content of Mo in the filter residue was 1.01%, and the Mo concentration in the filtrate was 0.71g / L. The leaching rate of molybdenum was 99.71%. The concentrations of Mo, Ni, K, Na, Cu, Si, and P in the ammonium molybdate solution were respectively 136.5, 0.0001,...

Embodiment 3

[0026] Organic phase preparation: the volume ratio is 35% P204+70% sulfonated kerosene.

[0027] Leaching: Take 50g molybdenum calcined sand (Mo, Ni, K, Na, Cu, Si, P mass percent content is 35.11, 0.076, 0.061, 0.081, 2.66, 2.43, 0.12%) and 100mL sulfuric acid with a concentration of 3mol / L , 550 mL of the organic phase were mixed, stirred and leached at 50°C for 40 minutes, clarified and separated to obtain a negative molybdenum organic phase, and filtered the slurry to obtain leaching residue and filtrate.

[0028] Stripping: Negative molybdenum organic phase mixed with 2.0mol / L ammonia water + 0.6mol / L ammonium carbonate, O / A=4 / 1, stirred at 25°C for 15 minutes to obtain ammonium molybdate solution and empty organic phase.

[0029] Results: The mass percent content of Mo in the filter residue was 0.77%, the Mo concentration in the filtrate was 0.95g / L, and the molybdenum leaching rate was 99.31%. The concentrations of Mo, Ni, K, Na, Cu, Si, and P in the ammonium molybdate ...

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Abstract

The invention discloses a method for preparing ammonium molybdate from molybdenum calcine by a synergistic acid leaching method. The method comprises the following steps: mixing molybdenum calcine with acid and an organic matter, decomposing the molybdenum calcine, and finally enabling molybdenum to be selectively combined with the organic matter and enter an organic phase, where impurities are retained in slag or a water phase, and the aims of decomposing the molybdenum calcine and separating the impurities are fulfilled. According to the method, the organic matter such as acidic phosphate ester, acidic phosphonic acid ester and oxime is mixed with a diluents to obtain an organic phase and acid which are mixed with the molybdenum calcine together to fulfill the aims of decomposing the molybdenum calcine and separating the impurities; and the process is short and simple, the reaction speed is high, the molybdenum decomposing rate is high, and the impurity separation effect is good.

Description

technical field [0001] The present invention relates to a novel process for decomposing molybdenum calcine, in particular to an organic phase and acid synergistically decomposing molybdenum calcine, decomposing molybdenum calcine and removing impurities such as copper, iron, silicon, sulfur and phosphorus to prepare ammonium molybdate The method belongs to the field of molybdenum hydrometallurgy. Background technique [0002] Molybdenum calcine often contains impurity elements such as copper, iron, silicon, sulfur, phosphorus, etc., and ammonium molybdate products have extremely high requirements for the content of the above elements. The national standard for ammonium molybdate products (GB / T 3460-2007) shows that the contents of Ni, K, Na, Cu, Si, and P elements in MSA-0 grade products are not higher than 0.003, 0.01, 0.001, 0.0003, 0.0005, 0.0005%. The existing process adopts ammonia-dissolved molybdenum calcine to prepare ammonium molybdate, obtains ammonium molybdate ...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/10C22B3/38C22B3/30C22B3/32C22B3/40C22B34/34
CPCC22B3/08C22B3/10C22B34/34C22B3/26C22B3/30C22B3/32C22B3/3846Y02P10/20
Inventor 肖超李义兵罗鲲
Owner 湖南瑞友有色科技有限公司
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