Pelletizing method suitable for heap leaching of gold ores

Abstract

The invention belongs to the field of metallurgy and mineral engineering, and discloses a pelletizing method suitable for heap leaching of gold ores. According to the method, certain amount of a binding agent is added into crushed cores and ore fines or gold concentrates which are small in grain size and are not suitable for direct heap leaching, a circular disk pelletizer is used for pelletizing, and the rotation speed, the moisture adding amount, the pelletizing time of the pelletizer are controlled in a pelletizing process, so that block mass with a relatively great grain size and various good performance indexes such as compressive strength, dropping strength, leaching strength and the like is finally prepared. The pelletized ore balls are uniform in grain size, and are relatively good in strength, so that the permeability of a stock heap is greatly improved, a leaching agent solution can be distributed more uniformly, and can be in contact with ores more sufficiently, and therefore, the leaching time is shortened, and the gold leaching rate is increased. According to the current condition that gold demand is increasing fiercely, world high-quality gold resource is increasingly exhausted and low-grade refractory gold ores become main raw materials for gold extraction, the method undoubtedly has a wide application prospect today. The method also can be applied to the field of pelletizing and heap leaching of minerals such as copper, nickel-cobalt, and the like.

Description

technical field [0001] The invention belongs to the field of metallurgy and mining engineering, and provides a granulation technology suitable for gold ore powder ore to obtain agglomerates that meet a certain strength and can improve the permeability of the ore heap and are beneficial to gold leaching, so that a large number of low-grade gold ore And the technical method that heap leaching gold extraction of waste rock can be realized. Background technique [0002] When the ore containing muddy components or high pulverization rate is directly heap leached, the gold leaching speed is slow and the leaching rate is low. Granulation technology is an effective means to solve the problem of poor heap leaching effect due to high mud content and high pulverization rate of ore. Since the 1980s, American gold mines have widely used granulation pretreatment technology, even for those ores with low mud content. The main purpose is to shorten the leaching cycle and improve production ...

AI Technical Summary

Problems solved by technology

[0004] The binders used in the above-mentioned and other existing digital granulation methods are cement and lime. This method is suitable for alkaline leaching systems, but under the conditions of acidic leaching systems, the strength of ore particles is often not high, so only leaching untreated When it is completed, some of the ore particles will be broken, resulting in a decrease in the permeability of the ore heap, a decrease in the leaching rate, and a prolonged leaching time. At present, there is no granulation technology that can use gold concentrate as raw material.

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