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Method for separating selenium and mercury from acid mud of copper-lead-zinc smelting sulfuric acid system

A zinc smelting and acid sludge technology is applied in the field of separating selenium and mercury, which can solve the problems of complex process methods, and achieve the effects of shortening stacking time, saving processing costs, and reducing the cost of recovering mercury.

Active Publication Date: 2017-05-31
HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN 103468956 A discloses a multi-element recovery method for acid mud produced in gold smelting, which is obtained by absorbing flue gas with dilute acid-solid-liquid separation-dissolving filter residue with nitric acid-adjusting pH with sulfide for the acid mud produced in gold smelting Mercury-containing minerals have been extracted, and the recovery of selenium and mercury in acid mud from gold smelting has been realized, but the process method is relatively complicated

Method used

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  • Method for separating selenium and mercury from acid mud of copper-lead-zinc smelting sulfuric acid system
  • Method for separating selenium and mercury from acid mud of copper-lead-zinc smelting sulfuric acid system
  • Method for separating selenium and mercury from acid mud of copper-lead-zinc smelting sulfuric acid system

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Embodiment 1

[0029] refer to figure 1 , a method of separating selenium and mercury from copper-lead-zinc smelting sulfuric acid system acid mud of the present embodiment comprises the following steps:

[0030] 1) Oxygen pressure alkali leaching acid mud leaching selenium and mercury fixation: Acid mud, sodium hydroxide, and lime are prepared into a slurry with a liquid-solid ratio of 4:1 in a weight ratio of 1:1.21:0.13, and then the reaction is started. Kettle stirring device, close the feed valve and tail gas valve, open the oxygen inlet valve, feed oxygen-enriched gas (such as industrial oxygen) into the reactor, pressurize to 2.0MPa (that is, 20 atmospheres), and then close the oxygen inlet valve. After reheating to 180°C, open the tail gas valve and oxygen inlet valve, and carry out oxygen pressure alkali leaching for 2.5 hours. The tail gas of the reactor is condensed in the condensation tank to remove mercury vapor, and the condensed water is returned to the reactor as a preparatio...

Embodiment 2~6

[0035] Compared with Example 1, a method of separating selenium and mercury from copper-lead-zinc smelting sulfuric acid system acid mud of the present embodiment, its specific operating conditions are shown in the following table:

[0036] The condition of oxygen pressure alkali leaching in the method described in table 1 embodiment 1~6

[0037]

[0038] Adopt the acid mud that the method shown in embodiment 1 ~ 6 is processed, the composition and content of nonferrous metal in the alkali leaching liquid and alkali leaching residue that it obtains are as shown in table 2, come out by selenium, mercury content in the alkali leaching residue Selenium leaching rate, mercury solid residue rate, and mercury volatilization rate are shown in Table 3.

[0039] Table 2 Composition table of alkali leaching solution and alkali leaching residue corresponding to acid mud treatment in Examples 1-6

[0040]

[0041] Table 3 Selenium leaching rate, mercury solid residue rate and mercu...

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Abstract

The invention discloses a method for separating selenium and mercury from acid mud of a copper-lead-zinc smelting sulfuric acid system. The method includes the steps of 1) leaching the selenium and solidifying the mercury from the acid mud by adopting the oxygen pressure-alkaline leaching process, specifically, mixing the acid mud, sodium hydroxide and lime to form slurry, adding the mixture into a reaction kettle according to a proportion, then, injecting oxygen-enriched gas into the reaction kettle, increasing the pressure to reach 1.7-2.2MPa, namely 17-22atm, carrying out heating to reach 160-220 DEG C, then carrying out oxygen pressure-alkali leaching for 1-4 hours, and condensing tail gas of the reaction kettle to remove mercury steam through a condensation tank, wherein condensed water returns to the reaction kettle to be recycled as a liquid for a alkali leaching mixture; 2) carrying out solid-liquid separation; 3) sealing and storing alkali leaching residues in the step 2), and sending the alkali leaching residues to a mercury factory to recover the mercury in a centralized mode; and 4) carrying out efficient reduction to prepare crude selenium, specifically, purifying alkali leachate in the step 2) and then carrying out reduction to recover the selenium. Compared with an existing technology for calcinating the acid mud by adding the lime, the method for separating the selenium and the mercury from the acid mud of the copper-lead-zinc smelting sulfuric acid system has the advantages that the reaction temperature is greatly reduced, the oxygen-enriched gas is used for oxidation, other oxidizing agents do not need to be added, the treatment cost is saved, and the leaching rate of the selenium is increased.

Description

technical field [0001] The invention relates to a method for recovering scattered metals, in particular to a method for separating selenium and mercury from acid mud in a copper-lead-zinc smelting sulfuric acid system. Background technique [0002] The acid sludge in the copper-lead-zinc smelting acid system mainly contains selenium and mercury. Mercury is a heavy metal that is extremely harmful to the environment. Elemental mercury can volatilize at room temperature. At present, most non-ferrous smelting enterprises sell mercury-containing acid sludge to mercury smelting enterprises to recover mercury, and selenium has not been recovered well. Acid sludge in non-ferrous smelting enterprises is a type of high-risk waste residue. Currently, non-ferrous smelting plants use long-term storage methods for storage. During the storage process, elemental mercury will continuously volatilize and pollute the atmosphere in the factory area. [0003] The common treatment method for mer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B43/00C22B13/00C01B19/02
CPCC01B19/02C22B7/008C22B13/045C22B43/00Y02P10/20
Inventor 付绸琳何从行谭振华阳自霖张晓林杜红付高明陈国兰
Owner HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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