Method for removing aluminum from nickel-cobalt solution

Abstract

The invention discloses a method for removing aluminum from a nickel-cobalt solution. The invention relates to Ni and Co metal salt solution purification, in particular to the method for purifying a leaching solution to remove aluminum in the process of producing nickel and cobalt through a wet method. The method is characterized in that the aluminum removal process sequentially comprises the following steps of (1) controlling the pH value of the solution before aluminum removal to be 2-2.5, and carrying out a stirring reaction; (2) controlling the pH value of the solution after reaction to be 2.5-3.0, and carrying out the stirring reaction; (3) controlling the pH value of the solution after reaction to be 3.5-3.5, and carrying out the stirring reaction; (4) controlling the pH value of the solution after reaction to be 4.5-4.5, and carrying out the stirring reaction; (5) controlling the pH value of the solution after reaction to be 3.3-3.5, and carrying out the stirring reaction; and (6) carrying out solid-liquid separation on the solution after reaction. According to the method, the problem that the solution is extremely difficult to filter is effectively solved, the reaction temperature is low, the energy consumption is low, deep aluminum removal can be achieved, the process adaptability is wide, and when the aluminum content in the solution reaches 6 g / L or above, deep aluminum removal can still be achieved.

Description

technical field [0001] A method for removing aluminum from a nickel-cobalt solution. The invention relates to purification of Ni and Co metal salt solutions, in particular to a method for purifying and removing aluminum from Ni and Co metal salt leaching solutions in the process of wet production of nickel and cobalt. Background technique [0002] In the process of wet production of nickel and cobalt, the leaching method is usually used to obtain the leaching solution of Ni and Co metal salts. Since the content of Al in the earth’s crust ranks third after oxygen and silicon, it often exists in Co, Ni, and other ores in the form of impurities, and enters the solution together with valuable metals during leaching. When producing valence metal products, corresponding purification treatment must be carried out first, and the Al content should generally be controlled between 0.1-0.01g / L. Al removal is an important process for the production of nickel and cobalt by hydrometallurg...

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Problems solved by technology

[0003] At present, the method for removing aluminum from the leaching solution of Ni and Co metal salts is: adding a pH regulator to the solution to adjust the pH of the solution to 3.5-4.5 to generate Al(OH) 3 , and then filtered, due to the Al(OH) 3 It is a jelly-like substance, and it is extremely difficult to filter. In order to improve the filtration performance of the liquid after aluminum removal, the temperature of aluminum removal is generally controlled above 80°C, and the main reaction time is generally at 85°C. The reaction temperature is high, energy consumption is large, and it is difficult to achieve depth Aluminum removal, and it is difficult to filter the liquid after aluminum removal

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