High-temperature biological heap leaching method of primary copper sulphide ores

Abstract

The invention relates to a high-temperature biological heap leaching method of primary copper sulphide ores. The method comprises the following steps of: (1) crushing primary copper sulphide ores, and uniformly mixing the crushed primary copper sulphide ores with a sulphur source, wherein the sulphur content of a mixture of the primary copper sulphide ores and the sulphur source is more than 3wt%, and the sulphur source is sulfide, sulphide ore and / or sulphur which can oxidize microorganisms and generate heat; (2) building the mixture which is formed by uniformly mixing the ores with the sulphur source to form an ore pile, and laying an inflation pipeline at a pile bottom and embedding oxygen and temperature probes in the pile in a pile building process; and (3) after the ore pile is built, leaching, and supplying oxygen into the ore pile through the inflation pipeline at the same time until the leaching is completed. According to the method, sulfide is oxidized under the action of microorganisms to release a great quantity of heat, so that the pile temperature is maintained at high temperature, and finally, the high-temperature leaching of the primary copper sulphide ores is realized.

Description

technical field [0001] The invention relates to a high-temperature biological heap leaching method of primary sulfide copper ore. Background technique [0002] The traditional primary copper sulfide ore treatment technology usually adopts the flotation-smelting method, but due to high cost and serious pollution, and with the depletion of resources, resource and environmental problems will become more prominent. In recent years, with the development of biometallurgy technology, the bioleaching of secondary copper sulfide ores has been industrialized. However, due to the passivation phenomenon in the bioleaching of primary copper sulfide ores, the primary copper sulfide ores cannot obtain a good leaching rate when leaching at room temperature. Experiments have shown that primary copper sulfide ore can obtain a higher leaching rate by using thermoacidophilic bacteria at high temperature (>60°C). In the actual bioheap leaching process, sulfide ore will release a lot of heat...

AI Technical Summary

Problems solved by technology

In the actual bioheap leaching process, sulfide ore will release a lot of heat during the oxidation process (see Table 1), but due to the heat dissipation of the ore heap and the cooling of the spraying process, and the sulfide content in the ore is usually low (< 5%), it is difficult to maintain the ore heap at a higher temperature

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