Self catalyzed reduction ammonia soaking process of deep sea polymetallic nodule in ammonia-ammonium chloride system

Abstract

The present invention is self catalyzed reduction ammonia soaking process of deep sea polymetallic nodule in ammonia-ammonium chloride system, and relates to method of optionally leaching out Ni, Cu, Co, Mo and other valuable metals from polymetallic nodule. The soaking process includes the following steps: leaching out ground polymetallic nodule in ammonia-ammonium chloride solution containing NH3 in 60-180 g / l, Cl- in 10-60 g / l and Cu+ over 4 g / l; concentrating and separating the leached out ore pulp; returning the supernatant to the leaching process and filtering and washing the underflow; oxidizing the leached liquid with air to eliminate impurity and returning the precipitate to the leaching process; and conventional extraction-electric depositing to recover Ni, Cu, Co, Mo and Zn from the oxidized leached solution. The process has simple leaching system, high metal leaching rate, low power consumption and other advantages.

Description

technical field [0001] A method for the self-catalytic reduction of ammonia leaching of deep-sea polymetallic nodules ammonia-ammonium chloride system relates to a method for selectively leaching valuable metals such as nickel, copper, cobalt, and molybdenum from polymetallic nodules, especially in ammonia-ammonium chloride In the solution, the autocatalytic reduction ammonia leaching method using carbon monoxide as the reducing agent. Background technique [0002] Deep-sea polymetallic nodules are an important metal mineral resource in the international seabed area. They are widely distributed on the surface of the ocean bottom at a water depth of 3500-6000m. The reserves are about 3×1012t, and the Pacific Ocean alone has 1.7×1012t, and it is still growing. It is estimated that the global The new growth of polymetallic nodules reaches 1×107t every year. Polymetallic nodules are rich in nickel, copper, cobalt and other metals, of which the content of nickel and copper is ab...

AI Technical Summary

Problems solved by technology

However, divalent copper ions enter the system, resulting in increased consumption of carbon monoxide, and the energy consumption of ammonia distillation is high, and the process is complicated

In order to ensure the smooth progress of the reduction leaching reaction, it is also required to adopt a higher leaching liquid-solid ratio, and the liquid-solid weight ratio is usually around 40, resulting in a large leaching equipment

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