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Method for removing iron with lead sulfate as vegasite-precipitating agent in wet zinc smelting process

A technology of hydrometallurgical zinc and lead sulfate, which is applied in the improvement of process efficiency, photography process, photography auxiliary process, etc., to achieve the effect of regeneration, high metal recovery rate and high precipitation rate

Active Publication Date: 2013-10-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process brings K + 、Na + or NH 4 + and other new impurities

Method used

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  • Method for removing iron with lead sulfate as vegasite-precipitating agent in wet zinc smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Using the neutral leaching slag produced by a certain factory as raw material, the high leaching solution obtained by low acid leaching and high acid leaching was returned to low leaching, the liquid-solid ratio was 6:1, the reaction time was 3 hours, and the temperature was 60°C. The following ingredients (g·L -1 ) after pre-neutralization: Zn 113.7, In 0.375, Cu 1.588, Fe 21.34, Pb 0.007, H 2 SO 4 14.32.

[0042] 2. Slowly add zinc oxide neutralizer to the above 5000mL pre-neutralized solution (that is, the supernatant obtained by one-stage acid leaching), and keep stirring. When the pH value of the solution is stable at 1.5, heat up to 95°C and add 115.56g Lead Sulfate and 50g PbFe 6 (SO 4 ) 4 (OH) 12 Seed, continue to stir for 3h, the whole process uses zinc oxide as a neutralizing agent to keep the acidity constant. After filtering, 5050mL of iron-precipitated liquid was obtained, and its chemical composition was (g·L -1 ): In 0.019, Sn 0.0002, Fe 0.81, ...

Embodiment 2

[0045] 1. Using the neutral leaching slag produced by a certain factory as raw material, the high-acid leaching solution obtained by low-acid leaching and high-acid leaching is returned to the low-acid leaching process. The liquid-solid ratio is 5:1, the reaction time is 4 hours, and the temperature is 55°C , to obtain the following composition (g·L -1 ) of pre-neutralized solution: Zn 110.57, In 0.356, Cu 1.383, Fe 22.84, Pb 0.006, H2 SO 4 13.52.

[0046] 2. Slowly add zinc oxide neutralizer to the above 5000mL pre-neutralized solution, and keep stirring. When the pH value of the solution is stable at 1.3, heat up to 95°C, add 123.68g of lead sulfate and 45g of PbFe 6 (SO 4 ) 4 (OH) 12 Seed, continue to stir for 4h, the whole process uses zinc oxide as a neutralizing agent to keep the acidity constant. After filtering, 5020mL of iron-precipitated liquid was obtained, and its chemical composition was (g·L -1 ): In 0.016, Sn 0.0002, Fe 0.97, Cu 0.96, Cd 0.165. The lead j...

Embodiment 3

[0049] 1. Using the neutral leaching slag produced by a certain factory as raw material, the high-acid leaching solution obtained by low-acid leaching and high-acid leaching is returned to the low-acid leaching process, the liquid-solid ratio is 7:1, the reaction time is 5 hours, and the temperature is 50 °C, the following composition was obtained (g·L -1 ) after pre-neutralization: Zn 105.26, In 0.39, Cu 1.5, Fe 23.37, Pb 0.006, H 2 SO 4 14.45.

[0050] 2. Slowly add zinc oxide neutralizer to the above 5000mL pre-neutralized solution, and keep stirring. When the pH value of the solution is stable at 1.6, heat up to 95°C, add 147.64g of lead sulfate and 40g of PbFe 6 (SO 4 ) 4 (OH) 12 Seed, continue to stir for 5h, the whole process uses zinc oxide as a neutralizing agent to keep the acidity constant. After filtering, 5070mL of iron-precipitated liquid was obtained, and its chemical composition was (g·L -1 ): In 0.022, Sn 0.0002, Fe 0.93, Cu 1.15, Cd 0.176. Alum slag i...

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Abstract

A method for removing iron with lead sulfate as vegasite-precipitating agent in the wet zinc smelting process includes the following steps: (1) high-acid leach liquor is preneutralized; (2) the iron in the preneutralized liquor is precipitated by the vegasite method, so that vegasite slag is obtained; and (3) the vegasite slag is leached with acid, so that leaching residue is obtained, and the leaching residue can be returned to serve as the vegasite-precipitating agent or material for lead smelting. According to the method, the vegasite method is adopted to precipitate iron, iron-zinc separation is realized and the vegasite slag is formed, and after the vegasite slag is leached with acid, the vegasite-precipitating agent is recycled. The process method is simple, the indium and zinc recovery rate is high, the iron-zinc separation flow is short, and the method is environment-friendly, and is suitable for industrial application, and the recycle of the vegasite-precipitating agent can be realized.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and relates to a zinc hydrosmelting process, in particular to a two-stage acid leaching-low-pollution lead jarosite iron removal-lead sulfate regeneration hydro-smelting zinc process. Background technique [0002] At present, several methods commonly used in the zinc removal process of wet smelting are: ① ferric hydroxide precipitation method, iron is precipitated with ferric hydroxide colloid, and its disadvantage is that the solid-liquid separation operation is difficult, especially when the solution contains too much iron. It may even lead to the inability of the production process; ②Hematite method to deposit iron, iron enters the slag in the form of hematite, but this method requires expensive titanium materials to manufacture high-pressure equipment and attached SO 2 Liquefaction plant, high investment cost, needs a SO 2 The stage of reducing iron alone; ③goethite iron p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B3/44C25C1/16
CPCY02P10/20
Inventor 何静罗超杨声海唐朝波杨建广王小能王涛陈永明郭瑞蓝明艳
Owner CENT SOUTH UNIV