Two-section innocent treatment technology for cyanogens-containing tailing pulp

Abstract

The invention discloses a two-section innocent treatment technology for cyanogens-containing tailing pulp. The technology comprises a pulp concentration step and an oxidization step, wherein in the pulp concentration step, thickening equipment is used for improving the concentration of the pulp to 50-55 percent; thickened supernate is returned to a site selection technology; high-concentration pulp enters the next treatment procedure; a thickening theory is that solid-liquid separation is performed through gravity sedimentation; in the oxidization step, oxidization is divided into two stages by an OOT oxidization method; in the first stage, sulfuric acid is added to control the pH of the pulp to be 9 to 10, and most releasable cyanides, thiocyanate ions and reductive substances can be removed through oxidization, so that the concentration of the releasable cyanides is smaller than 30 mg/L, and the concentration of the thiocyanate ions is smaller than 10 mg/L; in the second stage, the sulfuric acid is added to adjust the pH of the pulp to be 7 to 8; active carbon is fed in the second oxidization stage to enhance the oxidization effect; due to the adsorption effect of the carbon, gold in part of the tailing pulp can be recycled.

Description

technical field [0001] Gold mines generally use sodium cyanide to leaching gold. The cyanide-containing tailings slurry produced by it is harmful to the natural environment during the stacking process, and it needs to be treated harmlessly. The present invention will solve the standard discharge and safety Stacking problem. Background technique [0002] 1. Current status and development trend of harmless treatment technology of cyanide-containing tailings pulp [0003] In recent years, the harmless treatment of cyanide-containing tailings slurry has been gradually paid attention to. There are two types of treatment methods. One is to carry out comprehensive treatment of tailings slurry by pressure filtration, dry stacking of filter residue, and filtrate, and reuse or discharge after treatment; One is the direct treatment of tailings slurry. The method is basically to destroy cyanide. The methods include the Inco method, the alkaline chlorination method, and the ozone oxidat...

AI Technical Summary

Problems solved by technology

[0004] 2. Advantages and disadvantages of cyanide-containing tailings pulp treatment technology

[0016] ① If the pH value is too low during the reaction process, HCN and SO will escape 2 , and the residual cyanide is high; when the pH value is too high, the residual cyanide is also high, so the control of the reaction pH value is strictly required; when there is ferricyanide in the cyanide pulp and wastewater, it is difficult to oxidize to reach the standard

[0019] ④ May need to add catalyst copper salt - precious non-ferrous metals are consumed

[0020] ⑤ High power consumption, generally 3 to 5 times that of the chlorine oxidation method

[0023] ⑧When the wastewater contains arsenic, the removal rate of arsenic decreases due to sulfur dioxide reducing the arsenic to a low price, and the arsenic in the wastewater may exceed the standard

[0033] ① If the equipment is not well sealed during wastewater treatment, CNCl will escape into the air and pollute the operating environment

[0036] ④The concentration of chlorine ions in the drainage is high, which makes the surface water and soil salinized, and the water conservancy facilities corrode

[0037] ⑤ When the concentration of chloride ions is high, a large amount of calcium and magnesium will be dissolved. After the waste water leaks from the tailings pond, it will pollute the groundwater and greatly increase the concentration of calcium, magnesium and chlorine in the groundwater, which will seriously affect the function of the water. In severe cases, it cannot be drunk , cannot irrigate farmland

[0038] ⑥ The ...

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