Method for judging reduction leaching degree of concentrate containing trivalent cobalt in production site

Abstract

The invention relates to a method for judging reduction leaching degree of concentrate containing trivalent cobalt and a terminal point in a production site. The method provided by the invention is characterized by comprising the following steps of: 1) primarily detecting Fe<2+> content value of concentrate slurry containing the trivalent cobalt in the site before reaction; 2) adding acid to carry out the conventional acid-soluble reaction; 3) continuously detecting the Fe<2+> content in the site, adding a reducing agent; 4) continuously detecting potential and the Fe<2+> content in the site, judging whether the conditions that the potential in the site is lower than 380mV, preferably 360mV, and the Fe<2+> content value is 2.5-9.5g / L higher than the Fe<2+> content value in the step (1) are met, if the conditions are met, stopping addition of the reducing agent, and if the conditions are not met, returning to the step (3); and 5) continuously reacting for 0.5-3 hours, preferably 0.5-2 hours, so that reaction is finished. The method provided by the invention is easy to operate, and can be used for reducing the treating difficulty and cost of an after rod purifying process and guaranteeing that leaching slag is insoluble in cobalt and is discharged up to the standard.

Description

technical field [0001] The invention relates to a method for judging the reduction leaching degree and end point of a concentrate containing trivalent cobalt at the production site, in particular, the method for judging the reduction leaching degree and end point of a concentrate containing trivalent cobalt at the production site is an effective method for controlling the concentration of trivalent cobalt. The technical method of the reduction leaching production process of cobalt concentrate. Background technique [0002] During reduction leaching of trivalent cobalt concentrate, the elements in the ore gradually enter the leach solution in the order of nickel, cobalt, copper, and iron. A small part dissolves and remains in the slag. [0003] According to the traditional process method, the oxidation-reduction potential of the solution is 100-200mV to determine the reaction end point. Practice has shown that this will often cause excessive addition of reducing agent to a c...

AI Technical Summary

Problems solved by technology

[0003] According to the traditional process method, the oxidation-reduction potential of the solution is 100-200mV to determine the reaction end point. Practice has shown that this will often cause excessive addition of reducing agent to a certain extent, so that a large amount of iron is dissolved. Therefore, the leaching solution The content of iron is often as high as 12-18g / L, sometimes even up to 20g / L. Therefore, the waste of reducing agent is caused, and the difficulty and cost of the subsequent purification process are increased, and the unnecessary cost loss is relatively high.

Images