Method for leaching nickel and molybdenum from amorphous nickel-molybdenum sulfide mineral by oxidative conversion

Abstract

The invention belongs to the field of metallurgical chemical industry, and particularly relates to a method for leaching nickel and molybdenum from an amorphous nickel-molybdenum sulfide mineral by oxidative conversion. According to the technical scheme, the method comprises the following steps: mixing the amorphous nickel-molybdenum sulfide mineral which is finely ground with water to prepare pulp; adding the pulp into a pressure kettle, introducing industrial oxygen, and performing temperature rising reaction under the pressure of 0.8-2.0 MPa and at the temperature of 110-200 DEG C; converting the nickel and the molybdenum into sulfates, dissolving the sulfates into a solution, and filtering the pulp to obtain a leachate containing nickel sulfate and molybdenum sulfate acyl. The characteristics of large specific surface area and high activity of the amorphous nickel-molybdenum sulfide mineral are fully utilized; under the condition that acid is not added, colloidal sulfide is directly converted into sulfuric acid and sulfate in an oxidative manner, so that the nickel and the molybdenum can be leached, the process flow is short, conventional roasting is not needed, harmful smoke pollution is avoided, the process is clean, the consumption of reagents is low, and the leaching rate of metal is high.

Description

technical field

[0001] The invention belongs to the field of metallurgy and chemical industry, and in particular relates to a method for leaching nickel and molybdenum through oxidation transformation of amorphous nickel-molybdenum sulfide ore. Background technique

[0002] Amorphous nickel-molybdenum sulfide ore is a polymetallic complex mineral resource. The main metals are present in amorphous colloidal sulfide with extremely fine particle size, and most of the carbon is amorphous and filled in quartz and silk. Between mica and kaolin particles or in cracks, it is difficult to separate and enrich useful minerals by mineral processing technology. The existing technology for processing amorphous nickel-molybdenum sulfide ore is mainly based on the fire treatment process of molybdenite. The main technical methods are: oxidation roasting, calcification roasting, concentrated sulfuric acid curing roasting, etc. The basic process of these processes is to oxidize and desulfuri...