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Method for recycling valuable elements in acidic biological oxidation solution containing arsenic, iron and sulfur

A technology of valuable element and oxidizing liquid, applied in the field of hydrometallurgy, can solve the problems of increasing production cost, waste of resources, consumption of large calcium oxide, etc., and achieve the effect of zero discharge of waste, low production cost and stable product quality

Active Publication Date: 2017-03-22
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of calcium oxide will be consumed in the process of processing the biological oxidation solution, which will increase the production cost for the production enterprise and cause waste of resources such as arsenic and iron at the same time

Method used

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  • Method for recycling valuable elements in acidic biological oxidation solution containing arsenic, iron and sulfur

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Add the oxidizing solution and extractant to the mixing clarifier, the extractant is 2-ethylhexyl phosphate mono-2-ethylhexyl, the volume ratio of the organic phase to the water phase is 1:0.5, stir at room temperature Mix for 3 minutes, then clarify for 15 minutes, through three-stage countercurrent extraction, the Fe in the oxidation solution 3+ The ions enter the organic phase, and the iron-loaded organic phase is back-extracted with a hydrochloric acid solution with a concentration of 3mol / L to recover the iron in the organic phase, and the organic phase is recycled. The recovery rate of iron is 95.06%;

[0028] (2) Add milk of lime to the raffinate, adjust the pH value of the solution to 7, stir for 10 hours at a temperature of 15°C, and a stirring intensity of 600r / min, and perform solid-liquid separation after completion, and the solid neutralized slag is acid leached The raw materials and valuable elements of the process all enter the neutralization slag, an...

Embodiment 2

[0034] (1) Add the oxidizing solution and extractant to the mixing clarifier, the extractant is 2-ethylhexyl phosphate mono-2-ethylhexyl, the volume ratio of the organic phase to the water phase is 1:1.0, stir at room temperature Mix for 5 minutes, then clarify for 15 minutes, after three-stage countercurrent extraction, the iron in the oxidizing solution enters the organic phase, and the iron-loaded organic phase is back-extracted with a hydrochloric acid solution with a concentration of 4mol / L, and the iron in the organic phase is recovered, and the organic phase is recycled. , the recovery rate of iron is 96.58%;

[0035] (2) Add milk of lime to the raffinate, adjust the pH of the solution to 8, stir at 20°C and 650r / min for 8 hours, and then separate the solid from the liquid, and the solid neutralized slag is acid leached The raw materials and valuable elements of the process all enter the neutralization slag, and through solid-liquid separation, the enrichment and separa...

Embodiment 3

[0041](1) Add the oxidizing solution and extractant to the mixing clarifier, the extractant is 2-ethylhexyl phosphate mono-2-ethylhexyl, the volume ratio of the organic phase to the water phase is 1:1.5, stir at room temperature Mix for 7 minutes, then clarify for 15 minutes, and through three-stage countercurrent extraction, the iron in the oxidizing solution enters the organic phase, and the iron-loaded organic phase is back-extracted with a hydrochloric acid solution with a concentration of 5mol / L, and the iron in the organic phase is recovered, and the organic phase is recycled. , the recovery rate of iron is 96.28%;

[0042] (2) Add milk of lime to the raffinate, adjust the pH of the solution to 8, stir for 6 hours at a temperature of 25°C, and a stirring intensity of 700r / min. After completion, carry out solid-liquid separation, and the solid neutralized slag is acid leached The raw materials and valuable elements of the process all enter the neutralization slag, and thr...

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Abstract

The invention relates to a method for recycling valuable elements in an acidic biological oxidation solution containing arsenic, iron and sulfur and belongs to the field of hydrometallurgy. The method comprises the following steps: performing three-stage counter-current extraction on the oxidation solution and an extracting agent so that iron ions in the oxidation solution can turn into an organic phase so as to be separated and recycled; adding a precipitator to the iron-removed raffinate, and concentrating the elements such as arsenic, sulfur and a trace amount of copper, lead, zinc and iron in neutral dregs; leaching the ions of arsenic, copper, lead, zinc, iron and the like from the neutral dregs obtained after solid and liquid separation by using a sulfuric acid solution, and then performing solid and liquid separation to obtain a calcium sulfide product; adding sodium sulfide to a sulfuric acid leaching solution, precipitating arsenic ions in the solution in the form of arsenic sulfide and recycling arsenic in the form of a arsenic sulfide product after solid and liquid separation; and adding sulfuric acid to the arsenic-precipitated acidic solution, and repeating the step of leaching the arsenic in the neutral dregs. The method has the advantages that the used raw materials are easy to get and low in price; the technological process is simple and practical; comprehensive recovery rate of the valuable elements is high; and zero emission of wastes is realized.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for comprehensively recovering valuable elements from acidic biological oxidation liquid containing arsenic, iron, sulfur and other ions. Background technique [0002] Bacterial oxidation pretreatment process is a new type of process that began to be studied in the 1980s. It mainly uses the action of chemoautotrophic bacteria and its metabolite ferric sulfate to oxidize and decompose gold-coated sulfide minerals such as pyrite and arsenopyrite, so that The gold particles are exposed so that the gold particles can be in contact with the leaching agent, thereby increasing the gold leaching rate. [0003] Bacterial oxidation is a typical green metallurgical process. Its advantages are low investment, low production cost, simple process and convenient operation. At present, more than ten production enterprises adopting biological oxidation technology have been estab...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/20C22B30/04
CPCC22B7/007C22B26/20C22B30/04Y02P10/20
Inventor 张世镖王秀美郑晔郝福来赵俊蔚赵国惠李健
Owner CHANGCHUN GOLD RES INST
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