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

Abstract

The invention discloses an asynchronous simultaneous separation process of poor and difficult-to-separate nickel-copper ore. A cyclone centrifugal separation beneficiation technology is adopted, a part of gangue and metal minerals with low nickel-copper grade and fine granularity and meeting secondary flotation conditions are separated in advance in an ore grinding loop before flotation of the low-grade poor and difficult-to-separate copper sulfide ore, and directly enter the secondary flotation, so that the recovery rate of nickel-copper metal and the concentrate quality are improved. According to the asynchronous simultaneous separation process of the poor and difficult-to-separate nickel-copper ore, a process for pre-grading an ore grinding product by utilizing centrifugal gravity ore beneficiation equipment is applied to the ore grinding loop of a copper-nickel ore beneficiation flow. The asynchronous simultaneous separation process of the poor and difficult-to-separate nickel-copper ore can improve the flotation operation efficiency of each section, reduces the process energy consumption, achieves the purpose of improving the final copper-nickel separation index, and is economical, applicable, simple and good in 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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