Two-step low-temperature iron removing method for copper-cobalt ore leachate

Abstract

The invention provides a two-step low-temperature iron removing method for copper-cobalt ore leachate. The process that iron is removed in a two-step neutralization-hydrolysis mode, the final pH of first-step low-temperature iron removal is controlled to be 2.5-3.0, and the final pH of second-step low-temperature iron removal is controlled to be 3.5-4.5 is adopted. An open loop is formed through iron slag after first-step washing, the entrainment rate of valuable metal in the first-step iron slag is as low as being smaller than 0.1%, and the recovery rate of the valuable metal is increased; and the iron content of liquid subjected to second-step iron-removal is smaller than 0.01 g / L, the iron removing depth is high, and the solution purification iron-removing effect is good. Meanwhile, deep iron-removal can be conducted even at a low temperature, the energy consumption is low, accordingly the production cost is lowered, and the economic benefits are high. The method is simple, technical conditions are easy to control, the content of the valuable metal in the open-loop slag is low, and the metal recovery rate is high; the liquid subjected to low-temperate iron-removal is low in iron content and good in solution purification iron-removing effect; and meanwhile, raw materials provided for the method are low in price, low-temperature operation is achieved, the energy consumption is low, scale production is easy to achieve, and the economic benefits and the social benefits are good.

Description

Technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and specifically relates to a method for removing iron from a copper-cobalt ore leachate in the cobalt hydrometallurgical industry by using two-stage low-temperature neutralization water. Background technique [0002] In hydrometallurgy, the ore is usually leached with an acidic solution. The leaching solution contains trivalent or divalent iron ions, which will cause the cathode current efficiency to decrease in the subsequent process and the electrowinning process, and at the same time affect the quality of the electrowinning cobalt. Therefore, in addition to Iron is a very important process in hydrometallurgy. At present, there are many methods for removing iron, mainly the jarosite method, goethite method, hematite method, etc. However, these iron removal methods require high-temperature operation to achieve a good iron removal effect; at the same time, in a solution with a hig...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a copper-cobalt ore leaching solution for the problems and deficiencies in the prior art, such as low iron removal depth, more valuable metals in iron slag, and high energy consumption for high-temperature iron removal. Two-stage low-temperature iron removal method for ore leachate, the method provides cheap raw materials, simple process technology, mild reaction, easy operation, easy to realize large-scale production, and the iron content in the liquid after iron removal is less than 0.01g / L, and the iron removal depth is relatively high High; at the same time, the iron slag can form an open circuit, and the entrainment of valuable metals in the open circuit iron slag is less than 0.1%, and the metal recovery rate is high

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