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Method of reducing calcium content in high calcium sulfate content feed liquid

A technology of calcium sulfate and feed liquid, which is applied in the field of reducing calcium content in feed liquid with high calcium sulfate content, can solve the problems of clogging the extraction tank pipeline, wasting manpower and material resources, and reducing production efficiency, so as to reduce the content, improve production efficiency, Effects in simple steps

Inactive Publication Date: 2019-12-17
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the production of hydrometallurgy, calcium carbonate is often used to adjust the pH value of the acidic leaching liquid, resulting in too high calcium sulfate content in the system, forming a supersaturated calcium sulfate liquid, and the liquid after copper and iron is removed in the subsequent extraction In the decalcification process, a large amount of calcium sulfate precipitates will be formed in the extraction tank, which will block the pipeline of the extraction tank
Therefore, it is necessary to frequently and regularly clean the calcium sulfate precipitate in the extraction tank, and the production is forced to be interrupted, which wastes manpower and material resources and reduces production efficiency.

Method used

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Examples

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preparation example Construction

[0024] In the present invention, the content of calcium sulfate in the feed liquid with high calcium sulfate content is 2.30~2.56g / L, and the pH value is 4.0~4.5; The preparation method of the feed liquid with high calcium sulfate content preferably comprises the following steps:

[0025] providing a raw material leaching liquid, the content of calcium sulfate in the raw material leaching liquid is 1.07-1.52g / L, and the pH value is 1.5-2.5;

[0026] Calcium carbonate is used to adjust the pH value of the raw material leaching liquid to perform copper and iron impurity removal treatment to obtain a high calcium sulfate content liquid.

[0027] In the present invention, the raw material leaching liquid is preferably a liquid obtained by leaching cobalt concentrate with sulfuric acid; the content of calcium sulfate in the raw material leaching liquid is preferably 1.07-1.52g / L, more preferably 1.20-1.40g / L, the pH value is preferably 1.5-2.5, more preferably 1.7-2.2. In the pre...

Embodiment 1

[0039] Calcium sulfate dihydrate is roasted at 150°C for 2 hours, and the material obtained after roasting is ball milled and sieved to obtain calcium sulfate seeds with a particle size of 11-13 μm;

[0040]Cobalt concentrate is obtained raw material leaching feed liquid (the content of calcium sulfate is 1.3g / L, pH value is 2.0) after sulfuric acid leaching, adopts calcium carbonate to adjust the pH value of described raw material leaching feed liquid to carry out copper and iron impurity removal treatment ( Specifically, utilize N902 extraction agent to carry out extraction and remove copper), obtain high calcium sulfate content feed liquid (the content of calcium sulfate is 2.56g / L, and pH value is 4.0), add calcium sulfate crystal seed (per liter) under the condition of 200r / min Add 3g of calcium sulfate seed crystals in the feed liquid with high calcium sulfate content), stir at room temperature for 1h and then age for 1h, filter to obtain precipitates and decalcification ...

Embodiment 2

[0042] Calcium sulfate dihydrate is roasted at 150°C for 2 hours, and the material obtained after roasting is ball milled and sieved to obtain calcium sulfate seeds with a particle size of 11-13 μm;

[0043] Cobalt concentrate is obtained raw material leaching feed liquid (the content of calcium sulfate is 1.3g / L, pH value is 2.0) after sulfuric acid leaching, adopts calcium carbonate to adjust the pH value of described raw material leaching feed liquid to carry out copper and iron impurity removal treatment ( Specifically, utilize N902 extraction agent to carry out extraction and remove copper), obtain high calcium sulfate content feed liquid (the content of calcium sulfate is 2.56g / L, and pH value is 4.0), add calcium sulfate crystal seed (per liter) under the condition of 200r / min Add 5g of calcium sulfate seed crystals in the feed liquid with high calcium sulfate content), stir at room temperature for 1.5h and then age for 1h, filter to obtain precipitates and decalcificati...

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Abstract

The invention provides a method of reducing calcium content in a high calcium sulfate content feed liquid and belongs to the technical field of hydrometallurgy. The method of reducing calcium contentin the high calcium sulfate content feed liquid comprises the following steps: mixing the high calcium sulfate content feed liquid with calcium sulfate crystal seeds; and carrying out sedimentation treatment, ageing and solid-liquid separation, successively, wherein the content of calcium sulfate in the high calcium sulfate content feed liquid is 2.30-2.56 g / L, and the pH value is 4.0-4.5; and thegrain sizes of the calcium sulfate crystal seeds are 11-18 [mu]m. The calcium sulfate crystal seeds with special grain sizes are adopted to induce calcium sedimentation, so that the content of calcium sulfate in the feed liquid can be reduced effectively, a condition that calcium sulfate precipitates in an extraction tank are cleaned frequently in a follow-up extraction and calcium removal step is avoided, the manpower and material resources are saved, and the production efficiency is improved. In addition, the method provided by the invention is simple in step and high in operability, and facilitates scale production.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for reducing calcium content in feed liquid with high calcium sulfate content. Background technique [0002] In the process of metal hydrometallurgy, in order to ensure the smooth progress of the smelting process, it is necessary to remove impurities from the raw material leaching liquid, and calcium is one of the main impurity elements. The current decalcification methods mainly include fluoride decalcification and extraction decalcification. Fluoride decalcification is to remove copper and iron from the leaching solution, control the system at a specific pH value and temperature, and add fluoride (such as sodium fluoride or ammonium fluoride) to form calcium fluoride precipitation. However, after fluoride decalcification, fluorine will remain in the feed liquid, which will pollute the environment, and the national "Sewage Comprehensive Discharge Standard" allo...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/44C22B3/22
CPCC22B1/02C22B3/22C22B3/44Y02P10/20
Inventor 徐建兵李忠岐洪侃陈东英梁鑫赖耀斌
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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