Process for comprehensive recovery of copper-cobalt-containing sulfuric acid slag

Abstract

The invention discloses a process for comprehensive recovery of copper-cobalt-containing sulfuric acid slag. The process comprises the following steps that (1) the copper-cobalt-containing sulfuric acid slag is subjected to bioleaching, a vaccinal bacterium is Sulfobacillus thermosulfiooxidans 6Y-1, the leaching pH value is maintained within 1.8-2.5, the reaction period is 1.5-3 h, and the temperature is 60-80 DEG C; (2) bioleaching liquid is subjected to extraction through a copper extractant, an extraction phase enters electrodeposition after reverse extraction through sulfuric acid, and finally cathode copper is obtained; (3) copper extraction residual liquid is precipitated through limestone, iron is removed, cobalt extraction is conducted on a solution after iron removing through a mixed extractant of P507 and Cyanax272, the extraction phase is subjected to reverse extraction through sulfuric acid and concentrated, and a cobalt product is obtained; and (4) bioleaching slag obtained from the step (1) and iron slag obtained after precipitating and iron removing from the step (3) are combined and subjected to reduction roasting, and a metallization pellet is obtained. Valuable metal in the sulfuric acid slag is recycled through bioleaching firstly, meanwhile, the iron grade of the leaching slag is improved, the sulphur grade in the leaching slag is reduced, the quality of a subsequent metallization pellet is further improved, and finally comprehensive recovery of copper-cobalt iron is realized.

Description

technical field [0001] The invention relates to a process for comprehensive recovery of sulfuric acid slag containing copper and cobalt, especially the copper grade in the sulfuric acid slag is higher than 0.3%, the cobalt grade is higher than 0.04%, copper and cobalt can be obtained as separate products, and the iron in the sulfuric acid slag can be used as steelmaking raw materials The craft of recycling. Background technique [0002] Pyrite concentrate usually contains non-ferrous metals such as copper and cobalt. During the acid production process, non-ferrous metals such as copper and cobalt enter into the sulfuric acid slag. On the one hand, they cannot be effectively recovered and cause waste. On the other hand, they will affect the subsequent production of sulfuric acid slag into metals. quality of pellets. In addition, copper and cobalt in sulfuric acid slag usually need to be leached with high-temperature strong acid, and acid leaching will also cause a part of ir...

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Problems solved by technology

[0002] Pyrite concentrate usually contains non-ferrous metals such as copper and cobalt. During the acid production process, non-ferrous metals such as copper and cobalt enter into the sulfuric acid slag. On the one hand, they cannot be effectively recovered and cause waste. On the other hand, they will affect the subsequent production of sulfuric acid slag into metals. quality of the pellets

In addition, copper and cobalt in sulfuric acid slag usually need high-temperature strong acid leaching, and acid leaching will also cause a part of the loss of iron, and the sulfur content in the obtained metallized pellets will be high, affecting its quality

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