A method for reducing the content of suspended particulate matter in qualified bioheap leaching liquid

Abstract

The invention belongs to the field of biological metallurgy and specifically relates to a method for reducing the content of suspended particles in a biological heap leaching qualified liquid. A solution upper heap is initially started by using small flow; and an ore heap is gradually and slowly moistened by using an intermittent spraying and flow gradually-increasing mode; under the capillary actions of internal cracks of the ore heap and ore surfaces, a solution is enabled to be in contact with the ores and react with the ores in a more moderate manner within an enough long time; after the ore heap is sufficiently moistened, a filtration effect on the solution can be generated; at the moment, the intermittent spraying can be changed into continuous spraying; most suspended particles in the solution can be kept in the ore heap under the filtering effect of the ore heap, so that the content of the suspended particles in the solution which is leached from the heap can be reduced. Therefore, the purpose of controlling the TSS content of the qualified liquid is realized.

Description

technical field [0001] The invention belongs to the field of biometallurgy, and in particular relates to a method for controlling the content of suspended particles in a qualified biological heap leaching liquid. Background technique [0002] The bioheap leaching production cycle is long and the leaching rate is low. In order to accelerate leaching and increase the leaching rate, the existing spraying technology often uses a large-flow high-intensity spraying method. Although this can obtain a faster leaching rate, at the same time the large-flow solution is in the mine During the rapid percolation process in the heap, it is inevitable to wash down many solid particles with small particle size and leave the heap together with the solution. Therefore, the content of solid suspended particles (TSS) in the qualified liquid is relatively high, especially for those with high clay content, For new heaps with small broken particle size, and ore heaps that have been turned over to d...

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Problems solved by technology

[0002] The bioheap leaching production cycle is long and the leaching rate is low. In order to accelerate leaching and increase the leaching rate, the existing spraying technology often uses a large-flow high-intensity spraying method. Although this can obtain a faster leaching rate, at the same time the large-flow solution is in the mine During the rapid percolation process in the heap, it is inevitable to wash down many solid particles with small particle size and leave the heap together with the solution. Therefore, the content of solid suspended particles (TSS) in the qualified liquid is relatively high, especially for those with high clay content, For new heaps with small broken particle size, and ore heaps that have been turned over to dry or have a long leisure time, the ore heaps are relatively dry, and the TSS of the heap solution at the beginning of spraying is generally as high as 500-1000mg / L. The solution mixed out of the heap, and then the sedimentation through the solution ditch and the solution pool can be controlled at 150-200mg / L, but it is still far higher than the requirement that the TSS content of the qualified liquid in the extraction workshop is not higher than 30mg / L, so a large amount of three-phase substances are generated. It causes problems such as unstable production process, severe solvent loss, and decreased extraction rate. At the same time, it is very difficult to salvage and remove these three-phase substances, and the labor intensity of workers is high. The method of adding flocculants not only increases production costs, but also may cause damage to downstream electricity Overproduction brings more problems, and there is no simple, feasible, cost-effective control method at present

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