Method for extracting copper, cobalt and nickel from cupric oxide cobalt ore

Abstract

The invention provides a method for extracting copper, cobalt and nickel from copper oxide and cobalt oxide ores by a hydrochloric acid method. The method takes the copper oxide and cobalt oxide ores as raw materials, and comprises the steps of mining, ore preparation, ore leaching, separation, washing of leaching dregs, precipitation of copper in leaching liquid, precipitation of cobalt and nickel in the leaching liquid, purification of the leaching liquid, reclaiming of regeneration hydrochloric acid(caustic soda), utilization; and intermediate products of copper and nickel are extracted, the hydrochloric acid and the caustic soda are reclaimed and regenerated for cyclic utilization, and simultaneously washing water is reclaimed for cyclic utilization, no waste is discharged, so that the environmental pollution is not existed. The method has the advantages of fast leaching, strong impurity removal capability, high leaching ratio of the copper, the cobalt and the nickel, high recovery, wide application range of resources, the formation of a closed cycle not discharging to the outside and maximal environmental protection; under the condition of low unit metal investment, the process, the technology and the equipment of the invention can completely meet the requirements of mass production and industrial production; moreover, the technological process also has the advantages of simpleness, low energy consumption, little material consumption, low cost and relatively high comprehensive utilization rate of ores, and the economic benefits and the environmental protection benefits of the invention are much better compared with the prior art.

Description

technical field [0001] The invention relates to a method for extracting copper, cobalt and nickel from copper-cobalt oxide ore, in particular to a method for extracting copper, cobalt and nickel from copper-cobalt-nickel ore by acid leaching with hydrochloric acid, and belongs to the technical field of non-ferrous metal hydrometallurgy. Background technique [0002] At present, there are three main processing methods for copper oxide ore: (1) flotation, the flotation of copper oxide ore is divided into direct flotation and sulfide flotation. Direct flotation is the earliest method that does not use sodium sulfide activation and directly uses collector flotation methods, including fatty acid flotation, amine flotation, neutral oil emulsion flotation and chelation collector flotation. Selection method, etc. Oxidized copper ores are mostly characterized by high oxidation rate, large mud content, high combined copper content, uneven distribution of fine particles, mixed oxygen ...

AI Technical Summary

Problems solved by technology

Oxidized copper ores are mostly characterized by high oxidation rate, large mud content, high combined copper content, uneven distribution of fine particles, mixed oxygen and sulfur, and coexistence of various minerals, so it is difficult to use collectors to adsorb to the mineral surface. The surface of copper oxide minerals needs to be vulcanized to change fundamentally. Therefore, the recovery rate of copper oxide minerals treated by flotation is very low, generally only about 50%. It refines copper-cobalt ore into copper-cobalt white alloy through three processes of crushing, drying and smelting

Since the mineral forms in the copper-cobalt ore of the Congo (gold) are mainly hydrocobalt ore and miscellaneous cobalt ore, and associated copper oxide ore; the gangue minerals are mainly quartzite, with low calcium and magnesium contents, so the fire method exists The disadvantages are: (1) the smelting temperature is too high due to the small amount of slag-forming components in the ore; (2) the dust in the production process is large and the working environment is poor; (3) the operating voltage is low, which makes the composition of copper-cobalt oxide ore The fluctuation is large, the quartz stone content is as high as 76%, the specific resistance of the slag is large, the electrode is inserted deeper, the alloy temperature is high, and the furnace bottom load is increased; (4) It is difficult to replace the alloy discharge port, and the alloy discharge port adopts the form of graphite bushing , under the scouring of high-temperature alloys, it is easy to become larger. When replacing, it is necessary to protect the carbon brick of the furnace lining with refractory mud, and then press the graphite bushing. Because the carbon brick has good heat conduction, the refractory mud is easy to dry, and the graphite bushing is not easy to compress. Alloys are easy to run out of the gap, resulting in production safety accidents

However, with the rise of the price of raw materials, especially sulfuric acid, the investment in processing leached slag has also increased, which has greatly increased production costs and made it difficult for mining enterprises to operate

More importantly, the recovery rate of nickel and cobalt leached by sulfuric acid method is also very low

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