Asynchronous and simultaneous separation process of poor and difficult nickel-copper ore

Abstract

A kind of asynchronous co-separation process of poor and difficult nickel-copper ore of the present invention adopts cyclone centrifugal separation ore dressing technology, and selects a part of nickel in advance in the grinding circuit before flotation of low-grade poor and difficult separation copper-nickel sulfide ore The gangue and metal minerals with low copper content, fine particle size and meeting the conditions of the second-stage flotation are allowed to directly enter the second-stage flotation, so as to improve the recovery rate of nickel-copper metal and the quality of the concentrate. The present invention applies the process of pre-grading grinding products by centrifugal gravity beneficiation equipment to the ore grinding circuit of the copper-nickel ore beneficiation process. The invention can improve and enhance the flotation operation efficiency of each stage, reduce process energy consumption, achieve the purpose of improving the final copper-nickel separation index, and is economical, applicable, simple and has good beneficiation effect.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to an asynchronous and simultaneous separation process of poor and difficult nickel-copper ore. Background technique [0002] In a copper-nickel polymetallic sulfide ore, in addition to copper and nickel, there are also valuable elements such as cobalt, platinum group elements, gold, silver, selenium, gallium, indium, germanium, and chromium. The ore is characterized by low grade, high oxidation rate, and insignificant enrichment of associated elements. With the deepening of mining in the mining area, the number of poor and difficult ores is increasing year by year. At present, the nickel grade of the ore is about 0.56-0.65%, the copper grade is about 0.42-0.56%, and the content of valuable elements is low. Among the main carrier minerals of valuable elements, the total content of pentlandite and purple sulfur nickel ore is 1%, and the content of chalcopyrite...

AI Technical Summary

Problems solved by technology

The problems in this traditional beneficiation method are: the ore pulp after grinding enters into a stage of roughing synchronously. Due to the mixing of a large amount of gangue minerals, there is little room for improvement in the recovery rate of nickel-copper metal, and the impurity in the concentrate-magnesia The content is always high, which affects the increase in production costs of downstream smelting and processing

The problems existing in traditional beneficiation methods are as follows: for dilute and refractory ores, a large number of non-metallic minerals and a small amount of metallic minerals enter the separation process simultaneously, while serpentine, chlorite and dolomite in gangue minerals are easily separated. Heterogeneous agglomeration occurs in the flotation process, which affects the recovery of chalcopyrite, pentlandite, and purple sulfur nickelite in the ore, and a large amount of concentrate enters the ore during the flotation process.

In turn, the grades of nickel and copper in the concentrate will decrease, and the content of magnesium oxide will increase, which is very unfavorable to the quality assurance of the concentrate in production.

In addition, its own hardness is small, and the grinding process is easy to muddy, which will deteriorate the flotation conditions and cause great difficulties to the enrichment of nickel and copper in the flotation process

From the perspective of economic benefits, due to the synchronous sorting, the second-stage circulation fluctuates greatly, which will reduce the sorting efficiency and greatly increase the consumption of chemicals

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