Test report on extraction of copper from Xinjiang Kashi Xinxin low-sulfur low-iron copper concentrate

High copper, high silicon, low sulfur, low iron sulphide concentrate Kashi Xin produced, tested hydrometallurgical copper extraction.

The hydrometallurgical process selected in this study is correct, reasonable and feasible. Compared with the improved roasting-leaching-electrolytic deposition process, there are the following differences and characteristics:

1) The roasting in the conventional method is sulphation roasting, and copper is present in the form of sulphate in the roasting ore;

2) In the traditional method, there is an independent setting of the purification process; the improved process flow can not independently set the purification process and shorten the process flow.

3) After the electrowinning, the liquid treatment is greatly reduced. Reduce reagent consumption and increase copper recovery.

4) The main indicators of each process have been improved. Both are higher than the indicators of traditional processes.

The roasting ore is leached with dilute sulfuric acid solution, and the leaching rate of copper is 97.5%~98.5%, and the index is stable.

According to the characteristics of the chemical composition of the mine and the composition of the copper phase, combined with the metallurgical principle, scientific experiments and production practice analysis, it is proposed to extract copper from copper concentrate by hydrometallurgy. The specific process is: copper fine powder roasting-baking Sand leaching - leachate purification - electrolytic deposition to obtain metallic copper. The key in this process is the two processes of roasting and leaching. Therefore, this study focused on the leaching of concentrate roasting and roasting sand, and explored reasonable roasting and leaching conditions, and obtained a high leaching rate of 98.50%. The result of low copper content in the leaching residue. The roasting of copper fine powder realizes the semi-sulfation roasting which is difficult to achieve in domestic production, reduces the treatment amount of the electrolyzed liquid, and improves the recovery rate of the metal. Due to the purification of the leachate, electrolytic deposition is a mature process, so this test is no longer a conditional test.

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