Method for recycling gangue wrapping micro-fine particle gold in tailings through Nielsen gravity concentration equipment

Abstract

The invention discloses a method for recycling gangue wrapping micro-fine particle gold in tailings through Nielsen gravity concentration equipment, and belongs to the field of gold-containing tailings valuable metal recycling. The method specifically comprises the following steps that gold-containing tailings pulp is ground through a ball grinding mill till the mass percent content of particles with the granularity being -200 meshes is larger than or equal to 60%; then, the levigated gold-containing tailings pulp is fed into a continuous changeable mine discharging type Nielsen concentrating machine to be subjected to gravity concentration; the treatment amount accounts for 50%-80% of the minimum treatment amount of the type of the Nielsen concentrating machine; the middle or slightly low value in the design reference value range of the Nielsen concentrating machine is adopted as the fluidization water amount and is kept stable; and the gravity value ranges from 60 G to 120 G. According to different gold-containing tailings gold grades and occurrence states, when gold concentrates obtained through Nielsen gravity concentration do not reach the qualified gold concentrate quality standard, one or more times of table concentrator fine selection are added. According to the method, the gold grade which is 30g / t or above can be achieved, and the recycling rate is 50% or above.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of valuable metals from gold-containing tailings, and in particular relates to a method for recovering gangue-wrapped fine particles of gold from tailings by using Nielsen gravity separation equipment. Background technique [0002] With the decrease of easy-to-select gold ore resources in the world, it is more and more important to recover gold minerals from gold-bearing tailings. However, most of the gold minerals in the tailings are fine-grained gold wrapped in gangue minerals, so they have not been well utilized. The remarkable feature of gold in tailings is that gold is mainly wrapped in fine particle size (<0.037mm) in tailings, and most of the gangues wrapped in gold minerals are also in fine particle size. Due to the extremely fine particle size and the enveloping of quartz gangue, these fine particles of gold cannot be recovered by cyanidation leaching or flotation processes. ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method of recovering fine-grained gold minerals wrapped in gangue in tailings with Nelson gravity separation equipment, so as to solve the problem that the fine-grained gold minerals wrapped in gangue in tailings are difficult to be sorted in the natural gravity field , By adopting Nielsen gravity separation equipment to recover the fine-grained gold wrapped in gangue in the tailings, most of the gold minerals in the abandoned tailings can be recovered very well, so that the problem of the dwindling gold ore resources that are easy to be separated can be buffered

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