Method for recovering gold from roasting-cyanidation tailings

Abstract

The invention relates to a method for recovering gold from roasting-cyaniding tailings. The method comprises the following steps that proportioning is carried out, wherein sodium salt is added into the roasting-cyaniding tailings according to the standard that the ratio of Na2O to (Fe2O3+Al2O3+SiO2) is 1-1.5:1, uniformly mixing is carried out to obtain a mixture, and then water is added to blend the mixture into a mud block material; sintering is carried out, wherein the mud block material is fed into a high-temperature furnace for sintering to obtain sintered clinker; leaching in a low-alkalisolution is carried out, wherein the clinker is finely ground, leaching is carried out under the condition that the mass ratio of the low-alkali solution to the clinker is 4.5-6.5: 1, and primary filtering is carried out after the leaching reaction is finished so as to obtain filtrate 1 and filter residue 1; the filter residue is washed, wherein the filter residue 1 is fed into equipment with a mechanical stirring function, water is added for stirring and washing, and then secondary filtering is carried out to obtain filtrate 2 and filter residue 2; and cyaniding gold leaching is carried out,wherein a solution A is added to blend the filter residue 2 into ore pulp, meanwhile, the pH value is adjusted, activated carbon is added, then a sodium cyanide solution is added for conventional cyaniding gold leaching to obtain gold-loaded carbon, ternary filtering is carried out on cyanided tailing pulp to obtain filtrate 3 and filter residue 3, and the filter residue 3 is piled up. The methodhas the advantages of being simple and smooth in technological process, simple in operation, high in gold recovery rate, short in period, low in investment, environment-friendly, easy to industrialize and the like.

Description

technical field [0001] The invention relates to a method for recovering gold from cyanidation tailings, in particular to a method for recovering gold from roasting-cyanidation tailings, which is suitable for application in the technical field of nonferrous metallurgy. Background technique [0002] It goes without saying that gold can not only be used as a reserve fund to maintain currency and economic stability, but also has become a very important industrial raw material and strategic material. my country is the world's largest gold production and consumption country. With the depletion of single high-quality gold ore resources, low-grade polymetallic associated refractory gold ores have gradually become the main raw materials for gold extraction. Metal is wrapped in typical refractory gold ores, and often occurs in conventional pretreatment-cyanidation tailings, such as roasting pretreatment-cyanide gold extraction process tailings, the gold grade of the tailings is genera...

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Problems solved by technology

For example, Chinese patent CN104046787B discloses "a method for comprehensive utilization of cyanide tailings", which uses cyanide tailings as raw materials, and uses molten salts NaOH, NaCl and NaNO 3 A mixture of NaOH, NaF and NaNO 3 The mixture is used as the medium, roasted at a temperature of 200-700°C, and then the roasted product is soaked in water and separated from solid and liquid. Finally, the Fe in the filter residue is recovered by magnetic separation, and the Au and Au in the filter residue are recovered by cyanide leaching. Ag; while recovering Si from the filtrate, the method has the disadvantage of using NaF and NaNO 3 As a flux, it is not friendly to the roasting environment, and a large amount of toxic gas will be produced during the process, and the roasting material will be leached in water for a long time and the efficiency is low

Another example is "a gold-containing tailings or cyanide tailings pretreatment desiliconization gold leaching" disclosed in Chinese patent CN105349797B. Its process includes the following steps: (1) pouring gold-containing tailings or cyanide tailings In the kettle, mix evenly with lye, heat and react at constant temperature, cool and filter, and the filtrate is adjusted to make water glass or sodium silicate solution; (2) Add the filter residue in step (1) to the normal pressure reactor, add high concentration Alkali, react after heating, cool after the reaction, dilute and filter, and the filtrate is adjusted as the alkali liquor of the high-pressure reaction in step (1), and the filter residue is used for leaching gold; (3) the filter residue in the step (2) is added to cyanide Sodium solution and calcium oxide are added to adjust the pH of the pulp to 9-11, followed by cyanidation treatment, the leaching solution is used to recover gold, and the leaching slag is used to recover iron, which can not only turn gold-containing tailings or cyanide tailings into waste Bao, and the whole process is green and environmentally friendly, but it has the disadvantages of high equipment material requirements, large investment, high concentration of lye, and large consumption

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