Beneficiation process for increasing recovery rate of gold of refractory gold ores

Abstract

The invention relates to a beneficiation process for increasing the recovery rate of gold of refractory gold ores. According to the process, a reselection-floatation-reselection combined procedure is adopted to increase the recovery rate of the gold, and in other words, ores are ground till the particle size is -0.074 mm(60-80)%; a hydraulic power classifier is firstly utilized for classification, coarse gold concentrate is obtained from classified setting sand through a reselection method, and reselected tailings return to a ball mill to be ground gain; and classified overflow adopts a total-sulfur flotation method to recycle the gold, mustard gold concentrate is obtained, flotation tailings are reselected through a Nilson centrifugal ore separator, and obtained reselected concentrate returns to the ball mill to be ground gain. Early recovery and much recovery of the gold can be achieved through the process, gold which cannot be recycled because the particle size is too large or too small in total-sulfur flotation is effectively recycled, the purpose of selective ore grinding is achieved through reselection-ball mill closed cycle, the dissociation degree of the ores can be improved easily, the grade of the gold concentrate is remarkably improved, the metal recovery rate is remarkably increased, and good economic benefits can be brought to enterprises.

Description

technical field [0001] The invention relates to a beneficiation process for increasing the recovery rate of gold from refractory gold mines, and belongs to the technical field of beneficiation. Background technique [0002] With the massive development and utilization of vein gold ore resources, there are fewer and fewer gold mines that are easy to select and process, and more and more refractory gold mines with fine particle size and low grade. Broken zone altered rock type gold deposit is an important type of gold deposit discovered and determined in recent years, and belongs to refractory gold deposit. This type of ore deposit is formed by the gold-bearing hydrothermal metasomatization of broken zone rocks. The alteration of surrounding rocks is characterized by silicification and pyrite-sericite. The ore body mainly occurs in pyrite-sericite rocks. Chlorite is the main mineral, pyrite is the main metal mineral, and the ore is mostly disseminated in veinlets. Gold and s...

AI Technical Summary

Problems solved by technology

The advantage of using the total sulfur flotation method to recover gold is that the process structure is simple and easy to operate, but the disadvantages are also obvious: First, minerals with a particle size greater than 100 μm or less than 10 μm in flotation are difficult to float through the adhesive foam due to their low adhesion. Therefore, it will cause the loss of part of the dissociated coarse-grained gold and part of the micro-fine-grained gold; second, when the particle size of the gold inlay is relatively fine, after fine grinding and flotation, the muddying phenomenon in the pulp is serious, resulting in the middle ore circulation Large amount, low concentrate grade

The advantages of the amalgamation method for recovering this type of gold are low production costs and simple facilities, but the disadvantage is that the recovery rate of gold is low, and often due to mercury toxicity and mercury pollution to the environment, the amalgamation method has been banned at present.

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