Method for improving recovery rate of gold in semi-primary semi-oxidized gold ore by full flotation process

Abstract

The invention provides a method for improving a recovery rate of gold in a semi-primary semi-oxidized gold ore by a full flotation process. The method comprises the following steps: (1) after a raw ore is subjected to grinding, performing rougher flotation by a first-stage flotation column to obtain primary concentrate and primary tailings, and performing cleaner flotation on the primary concentrate by the first-stage flotation column to obtain cleaner tailings and final gold concentrate; (2) performing scavenging flotation on the primary tailings by a first-stage flotation machine to obtain primary scavenging flotation concentrate and primary scavenging flotation tailings, performing scavenging flotation on the primary scavenging flotation concentrate by using a second-stage flotation machine to obtain secondary scavenging flotation concentrate and final tailings, and allowing the secondary scavenging flotation concentrate to return to the first-stage flotation machine for scavengingflotation; and (3) merging tailings having a concentrated gold-supported poor intergrowth body and the primary scavenging flotation concentrate, performing classification operation in a cyclone to obtain a settled sand product and an overflow product, performing grinding on the settled sand product, merging the ground settled sand product with the overflow product to return to a first-stage flotation column for rougher flotation. The method provided by the invention effectively solves the problem that a poor intergrowth body enters tailings in the production process, so that the recovery rateof the gold by flotation is low, and discards cyanide leaching operation in a current process, thereby eliminating environmental hazard of cyanides from a source.

Description

technical field [0001] The invention relates to the technical field of gold recovery from gold mines, in particular to a method for improving the gold recovery rate of semi-primary semi-oxidized gold mines by a full flotation process, which can replace the existing flotation + cyanide process and eliminate the harm of cyanide to the environment . Background technique [0002] my country is rich in gold mineral resources, but with the continuous consumption of gold resources, the current reserves of gold resources are not optimistic, and the average grade of gold mines is showing a downward trend year by year. Due to the excessive consumption of shallow resources in the past, the exploration and development of gold mines has gradually shifted to deep places. Gold ore resources are increasingly characterized by scattered distribution, difficult dressing, smelting and recovery, and the proportion of low-grade refractory mineral resources is gradually increasing. [0003] Durin...

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Problems solved by technology

[0006] Aiming at the characteristics of semi-primary and semi-oxidized mixed gold ore resources, the present invention provides a method of selective grinding of gold-bearing poor contiguous minerals-flotation recovery of fine-grained gold-bearing minerals, which replaces the existing flotation + cyanide leaching process , to solve the problem of low recovery rate of flotation gold caused by poor contiguous organisms entering the tailings in the flotation process, to achieve the purpose of recovering such gold resources by the full flotation process, and to eliminate the environmental pollution caused by cyanide from the source

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