A short-process gold extraction method for alkaline sulfur-arsenic-coated gold deposits

Abstract

The invention relates to the process technology for extracting precious metal gold from ore, and particularly discloses a short-process gold extraction method for alkaline sulfur-arsenic wrapped goldore. Acid consumption of piled ore is reduced through a carbonate sorting process, then nitric acid is applied to acidizing, and the pH value of percolating fluid generated after ore pile acidizing isadjusted through nitric acid or sulfuric acid; after ore pile acidizing is completed, microorganisms are inoculated for biological dump leaching oxidation, and the pH value of bioleaching liquid is adjusted through acid or alkali; after ore pile biological oxidation is completed, a non-cyanogen leaching agent prepared by thiocyanate, thiourea, sulfuric acid and the like is used for gold extraction; and ore obtained after pile discharging and carbonate products in the carbonate sorting process are mixed so as to avoid hillock acidizing. By means of the short-process gold extraction method, theapplication range of the biological dump leaching technology is widened, new choices are provided for development of the alkaline sulfur-arsenic wrapped refractory gold ore, and the resource reserveof available gold is increased.

Description

technical field [0001] The invention belongs to the technical field of clean hydrometallurgy, and in particular relates to a process technology for extracting precious metal gold from ores, in particular to a short-flow gold extraction method for alkaline sulfur-arsenic wrapped gold ore. Background technique [0002] With the continuous development of gold mining, the easy-to-handle gold ore resources are increasingly exhausted, and the refractory gold ore will become the main resource of the gold industry in the future. According to the statistics of the China Gold Association, the total amount of refractory gold ore resources in my country (mainly sulfur-arsenic-coated fine-grained disseminated gold ore) is 1500t--2000t, accounting for more than 30% of the geological reserves; and with the continuous development of deep resources It has been proved that its proportion is increasing. Most of my country's newly proven gold resources are distributed in remote mountainous area...

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Problems solved by technology

[0006] The present invention aims at the characteristics (remote, low grade, small scale, etc.) of alkaline sulfur and arsenic wrapped gold ore resources in my country, and is suitable for the production method of directly extracting gold on site by biological heap leaching and oxidation, and provides an alkaline sulfur A short-process gold extraction method for arsenic-encapsulated gold mines, which uses photoelectric separation or radioactive separation to separate coarse-grained carbonate minerals, which can reduce the content of acid-consuming carbonate minerals in stockpiled ores; before biological oxidation Dilute nitric acid leaching treatment of carbonate minerals in the ore heap can avoid problems such as poor permeability of the ore heap, local compaction and low oxidation efficiency caused by the cementation of calcium sulfate and iron hydroxide during the bioheap leaching oxidation process; After heap leaching and oxidation, use acidic non-cyanide leaching agent to extract the gold in the ore

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