Process for extracting nickel and molybdenum from black shale through acid wet method

Abstract

The invention discloses a process for extracting nickel and molybdenum from black shale by an acidic wet method. The process comprises the following steps that (1) the black shale is crushed and added into water; (2) the temperature of a solution is raised to 80-100 DEG C under a stirring condition, and then industrial oxygen is introduced into the solution; then concentrated nitric acid is pumped; (3) filtering is carried out to obtain filtrate, and the filtrate passes through an ion exchange tower to obtain leacheate and tower penetrating liquid; (4) the pH value of the leacheate obtained in the step (3) is adjusted with ammonia water, heating is carried out to 80-120 DEG C, and filtering is carried out to obtain a NiSO4 solution; and (5) the pH value of the tower penetrating liquid obtained in the step (3) is adjusted to 5-6 by using a NaOH solution, then the pH value is adjusted to 7-8 with ammonia water, the temperature is raised to 80-100 DEG C, then impurities are removed, and filtering and washing are carried out to obtain an ammonium molybdate solution. Under the action of concentrated nitric acid, sulfur in the black shale is separated and then oxidized into sulfuric acid, so that the problem of air pollution caused by sulfur dioxide in a traditional process is solved.

Description

technical field [0001] The invention relates to a metal mineral extraction technology, in particular to a process for extracting nickel and molybdenum from black shale by an acidic wet method. Background technique [0002] The large area of ​​hilly areas in the southwestern provinces of my country is rich in black shale formations. Although the deposits are scattered, the economic value generated by concentrating all the quantities in the country may not be inferior to the concentrated deposits of vanadium-titanium magnetite. It can be seen that its economic value larger. Based on the above general knowledge, in the short period of ten years from the end of last century to the beginning of this century, more than hundreds of enterprises for smelting black shale to extract nickel and molybdenum have been established spontaneously by the people in Xiangxi, Hunan and Zunyi, Guizhou. There are many processes used, the most representative of which is the patent CN1177012A, which ...

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Problems solved by technology

[0003] The technical problem to be solved in the present invention is to overcome the deficiencies of the prior art and provide a process for extracting nickel and molybdenum from black shale by acidic wet method that solves the problem of environmental pollution caused by sulfur dioxide in the traditional process

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