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Method for recovering iron from sulphuric acid leachate through extraction

A technology for leaching liquid and recovering iron, which is applied in the direction of improving process efficiency, etc., can solve problems such as complicated operation, secondary pollution, and being in the experimental stage, and achieve the effects of simple operation, avoiding consumption, and reducing production costs

Inactive Publication Date: 2014-11-26
广东省工业技术研究院(广州有色金属研究院)
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  • Abstract
  • Description
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Problems solved by technology

Although the precipitation method can achieve the effect of iron removal, such methods generally have complicated operations, difficult filtration, large loss of valuable metals, high consumption of neutralizers, and difficulty in reclaiming iron slag. At the same time, stacking takes up land and is easy to cause secondary pollution. and other problems, especially iron-rich leachate, iron removal by precipitation is more difficult
②Extraction method: It has the advantages of low energy consumption, less pollution, and easy operation, but it is still in the experimental stage, and no industrialization report has been seen.
At the same time, when the concentration of iron in the feed liquid is high, the change of pH during the extraction process will easily cause iron to precipitate.
For this reason, how to remove iron from the sulfuric acid leaching solution with Fe>14g / L and pH<0.5 has not been reported.

Method used

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  • Method for recovering iron from sulphuric acid leachate through extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The sulfuric acid leaching solution of a composite ore contains Fe 14.0g / L (of which Fe 2+ 2.8g / L), Cu 5.35g / L, Co 0.25g / L, Ni 6.31g / L, the concentration of free acid is 0.32mol / L, add hydrogen peroxide which is 1.2 times the theoretical amount required for the oxidation of ferrous iron into the leaching solution After oxidation, the volume ratio of 20%N235-5%TBP-75% sulfonated kerosene extraction agent and leachate is O:A=1:1, and the extraction time is 2min for a first-stage cross-flow extraction to the acid-removed raffinate pH=0.89, after the first extraction of iron, the raffinate pH=1.68, the pH was adjusted to 0.7, the second extraction of iron, the raffinate pH=1.88, the pH was adjusted to 0.7, the third extraction of iron, the obtained extraction The remaining liquid contains Fe 0.31g / L, and the calculated iron extraction rate is 97.79%. The iron-loaded organic phase and 20g / L sulfuric acid solution are subjected to two-stage countercurrent stripping at O:A=1:...

Embodiment 2

[0020] The sulfuric acid leaching solution of a composite ore has a main component content of Fe 28.4g / L (of which Fe 2+ 4.53g / L), Cu 4.35g / L, Co 0.19g / L, Ni 4.63g / L, the concentration of free acid is 0.78mol / L, add hydrogen peroxide which is 1.2 times the theoretical amount required for the oxidation of ferrous iron into the leaching solution After oxidation, the volume ratio of 40%N235-20%TBP-40% sulfonated kerosene extractant and leachate is O:A=1:1, and the extraction time is 20min to perform a first-stage cross-flow extraction from acid to acid removal raffinate Liquid pH=0.95, after extracting iron for the first time, the raffinate pH=2.34, adjusting the pH to 0.9, extracting iron for the second time, the obtained raffinate contains Fe 0.56g / L, and the calculated iron extraction rate is 98.04%; The iron-loaded organic phase and 60g / L sulfuric acid solution were subjected to a first-stage back extraction according to O:A=1:1, and the back extraction time was 20min. The b...

Embodiment 3

[0022] The iron-containing sulfuric acid leaching solution of a composite ore has a main component content of Fe 28.4g / L (of which Fe 2+ 4.53g / L), Cu 4.35g / L, Co 0.19g / L, Ni 4.63g / L, the concentration of free acid is 0.78mol / L, and 1.5 times the theoretical amount required for the oxidation of divalent iron is added to the leaching solution. After sodium sulfate oxidation, the volume ratio of 30%N235-10%TBP-60% sulfonated kerosene extraction agent and leachate is O:A=1:1, and the extraction time is 2min for 1-stage cross-flow extraction to acid removal extraction. The raffinate pH=0.75, after extracting iron for the first time, the raffinate pH=1.88, adjust the pH to 1.2, extract iron for the second time, the raffinate pH=2.52, adjust the pH to 0.95, extract iron for the third time, extract Raffinate pH=2.24, adjust pH to be 1.2, extract iron for the 4th time, obtained raffinate contains Fe 0.52g / L, calculates iron extraction rate 98.17%; Load iron organic phase and 60g / L sul...

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Abstract

The invention discloses a method for recovering iron from sulphuric acid leachate through extraction. The sulphuric acid leachate contains greater than 14g / L of iron and 0.3-4.0mol / L of free acids, and has a pH value of less than 0.5. The method is characterized by comprising the following steps of: adding an oxidant to oxidize divalent iron in the sulphuric acid leachate; extracting the sulphuric acid leachate by an extractant to obtain deacidified raffinate; extracting iron from the deacidified raffinate by using the extractant; extracting the previous raffinate by the extractant, repeating for 2-5 times in this way, and mixing iron-loaded organic phases; re-extracting the mixed iron-loaded organic phase by using a sulphuric acid solution to obtain iron sulphate solution and an organic phase; mixing an acid-loaded organic phase and the organic phase, neutralizing acid by a basic solution, and recycling the extractant. The invention discloses a method for recovering iron, which is low in cost, simple in process and operation and environment-friendly and can be put into industrialization.

Description

technical field [0001] The invention relates to a method for extracting and recovering iron from sulfuric acid leaching solution, belonging to the field of hydrometallurgy. Background technique [0002] Due to the large amount of iron reserves, iron occupies a relatively large proportion in different minerals. In the non-ferrous metallurgical wet process, the iron in the ore is leached into the leachate with the main metal to varying degrees, which has a great effect on the subsequent purification and enrichment of valuable metals. It has a great negative impact and is the most important impurity element. In recent years, with the exhaustion of high-grade ores, the utilization of low-grade complex composite ores has become the key. In order to improve the leaching rate of valuable metals in low-grade complex composite ores, the leaching method of high-concentration sulfuric acid under pressure is often used. The characteristics of the leachate : ① The concentration of iron ...

Claims

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Application Information

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IPC IPC(8): C22B3/26C22B3/44
CPCY02P10/20
Inventor 邱显扬张魁芳刘志强曹洪杨朱薇李伟郭秋松
Owner 广东省工业技术研究院(广州有色金属研究院)
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