Method for detaching impurity copper from solution containing nickel

Abstract

The invention relates to a method for extracting nickel through hydrometallurgy, which particularly relates to a method for removing copper from nickel containing solution. The method comprises the following steps: utilizing sulfur compound of nickel to be decoppering agent which does a reacton with impurity copper ion in anode liquor to generate copper sulfide sediment, adding thiocarbonic acid nickel in nickel solution, and leading the scope of mole ratio between nickel which contains in thiocarbonic acid nickel and copper which contains in solution to be 1.0-2.0, controlling the scope of solution temperature to be 10-150 DEG C and the scope of pH to be 2-7, wherein copper removing time is 5-300 minutes, filtering, and separating copper which is less than 3mg / l and liquid after removing copper of copper / nickel which is bigger than 15. The decoppering agent of the invention has the advantages of high activity, long activity maintenance time, simple operation and low production cost, harmless ion is not led in the process of removing copper, copper removing slag can directly feed copper to smelt.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to nickel extraction metallurgy, which is a method for removing impurity copper from nickel-containing solution. Background technique [0002] Copper and nickel are similar elements, and metallic copper is associated with nickel ore. Nickel / copper separation becomes an important link in the nickel smelting process. [0003] The nickel concentrate plus anode slime method currently used in industry is to add nickel concentrate and anode slime with a ratio of 4:1 to the solution after nickel electrolysis to remove copper. Although the method itself is not complicated, it has the function of nickel supplementation, and the copper content in the solution after copper removal can still meet the requirements, but the labor intensity is high, the reagent consumption is high, and the iron content in the solution also rises after copper removal. Moreover, about 150kg of copper slag should be ...

AI Technical Summary

Problems solved by technology

But in this way, not only sodium is introduced into the system, but also the stoichiometric difficulty is caused (in this test, only through the system control potential to measure indirectly); again, because the pH during the preparation seriously affects the activity of nickel sulfide, precise monitoring is required.

However, NiS is easily deposited on the surface of the glass electrode used to measure pH, which increases the measurement error and seriously lags behind, and its use and maintenance are complicated.