Method for increasing cyaniding recycling rate of antimony-containing gold concentrate

Abstract

The invention discloses a method for increasing the cyaniding recycling rate of antimony-containing gold concentrate. The method includes the following steps that the antimony-containing gold concentrate from a size mixing groove is conveyed to a closed stirring leaching groove of a leaching workshop through a pump, cathode liquid returning from an electrodeposition workshop is added in, the ore pulp concentration is made to be adjusted to 50%, sodium sulfide and sodium hydroxide are added in the leaching groove for supplementing, the concentration of Na2S and NaOH in leached ore pulp is keptat 50 g / L and 20 g / L; the leaching temperature is 60 DEG C, and the leaching time is 1 h; after antimony in the antimony-containing gold concentrate in the leaching groove completely reacts with sodium sulfide and sodium hydroxide, ore pulp is pressed and filtered, antimony slag is obtained, and the antimony grade of antimony leaching slag is 0.5% or so; and the produced antimony leaching slag issubjected to ore blending again, and after ore blending, secondary calcining is performed. By optimizing the leaching process, the leaching rate is increased to 85% from the original 75%, and the antimony slag grade is lowered to 0.7% or so; and the cyaniding recycling rate is increased, and the alkaline leaching antimony removing process of the antimony-containing gold concentrate is optimized.

Description

technical field [0001] The invention relates to a method for improving the cyanidation recovery rate of antimony-containing gold concentrate, which belongs to the technical field of metallurgy and chemical industry. Background technique [0002] Antimony (English: Antimony, Latin: stibium) is a poisonous chemical element with symbol Sb and atomic number 51. Antimony is a silvery white shiny hard and brittle metal with a scaly crystal structure. It gradually loses its luster in humid air, and burns into white antimony oxides under strong heat. Soluble in aqua regia, soluble in concentrated sulfuric acid. Toxic, the minimum lethal dose is 100mg / kg; irritating. [0003] Antimony is a metalloid with metallic luster, which mainly exists in nature in the sulfide mineral stibnite (SbS). It is now known that antimony compounds were used as cosmetics in ancient times, and metal antimony was also recorded in ancient times, but it was mistaken for lead at that time. Antimony was k...

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Problems solved by technology

[0010] 1. In the sodium sulfide leaching-sodium sulfide antimonite solution electrodeposition method, the accumulation of sodium sulfate, sodium thiosulfate, sodium sulfite and sodium thioantimonate is serious, the waste liquid treatment volume is large and complicated, the current efficiency is low, and the power consumption high;

[0011] Two, the hydrogenation reduction method of sodium thioantimonite leaching solution is technically feasible, but there are problems such as slow reduction speed in this method, antimony method bonding reaction tube wall, etc.;

[0012] 3. In the ferric chloride-electrodeposition method, the accumulation of impurities in the solution is faster, the anion exchange membrane is more expensive and the loss is faster, and the electrodeposition control conditions are harsh; the separation of As and Au in the leaching residue is difficult, and the production cost is high;

[0013] 4. The hydrolysis process requires a large amount of water to dilute the solution, high acid consumption, large water consumption, and large reagent consumption, while the antimony recovery rate is low and the wastewater discharge is large

[0014] In the above method, the highest recovery rate of cyanide in the gold concentrate is only 85%, the recovery efficiency is low, and the labor intensity in the operation process is high

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