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Method for preparing lead chloride and zinc sulfate by using mid low grade zinc oxide ores and zinc oxide-lead oxide paragenetic ores

A technology of zinc oxide ore and lead chloride, which is applied in the direction of zinc sulfate and lead halide, can solve the problems of ammonia distillation tower scarring, single product structure, and high energy consumption in the ammonia distillation process, and achieve low production costs and low equipment requirements. High, simple process effect

Inactive Publication Date: 2015-04-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ammonia method has problems such as high energy consumption in the ammonia distillation process, serious scarring of the ammonia distillation tower, and single product structure.

Method used

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  • Method for preparing lead chloride and zinc sulfate by using mid low grade zinc oxide ores and zinc oxide-lead oxide paragenetic ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The zinc ore composition used is: ZnO 30.6%, SiO 2 21.70%, Fe 2 o 3 20.10%, Al 2 o 3 4.70%, PbO 4.67%, CaO 4.26%, SrO 3.56%.

[0030] Grind zinc ore to below 80μm and mix evenly with ammonium sulfate. The amount of ammonium sulfate added is 0.8 times the theoretical value of ammonium sulfate required for the complete reaction of zinc, iron and aluminum in the zinc oxide ore, and the roasting temperature is 350°C for 3 hours. The generated tail gas is absorbed by sulfuric acid and then returned to the roasting process.

[0031] The clinker is eluted with water, the liquid-solid mass ratio is 2:1, the elution time is 2 hours, the temperature is 100° C., and it is filtered after the elution is completed. Add hydrogen peroxide to oxidize Fe in the obtained filtrate 2+ , and spray it into the bottom solution at a certain flow rate to keep the Fe in the bottom solution 3+ The concentration is below 1g / L, the pH of the solution is adjusted to 3.5 with zinc calcine, ...

Embodiment 2

[0034] The zinc ore composition used is: ZnO 35.82%, SiO 2 18.05%, Fe 2 o 3 14.06%, Al 2 o 3 5.10%, PbO 6.84%, CaO 3.67%, SrO 2.24%.

[0035] Grind zinc ore to below 80μm and mix evenly with ammonium sulfate. The amount of ammonium sulfate added is 1.1 times the theoretical value of ammonium sulfate required for the complete reaction of zinc, iron and aluminum in the zinc oxide ore. The roasting temperature is 400°C and the time is 2.5 hours. The generated tail gas is absorbed by sulfuric acid and then returned to the roasting process.

[0036] The clinker is eluted with water, the liquid-solid mass ratio is 4:1, stirring is carried out during the elution process, the elution time is 1.5 h, the temperature is 80° C., and filtering is performed after the elution is completed. Add hydrogen peroxide to oxidize Fe in the obtained filtrate 2+ , and spray it into the bottom solution at a certain flow rate to keep the Fe in the bottom solution 3+ When the concentration is ...

Embodiment 3

[0039] The zinc ore composition used is: ZnO 25.5%, PbO 10.34%, SiO 2 20.41%, Fe 2 o 3 16.90%, Al 2 o 3 6.99%, CaO 5.80%, SrO 2.98%.

[0040] Grind zinc ore to below 80μm and mix evenly with ammonium sulfate. The amount of ammonium sulfate added is 1.5 times the theoretical value of ammonium sulfate required for the complete reaction of zinc, iron and aluminum in the zinc oxide ore, and the roasting temperature is 500°C for 1 hour. The tail gas produced by roasting is absorbed by sulfuric acid, and then returned to the roasting process. The clinker is eluted with water, the liquid-solid mass ratio is 5:1, stirring is carried out during the elution process, the elution time is 0.5h, the temperature is 20°C, and the elution is completed and filtered.

[0041] Add hydrogen peroxide to oxidize Fe in the obtained filtrate 2+ , and spray it into the bottom solution at a certain flow rate to keep the Fe in the bottom solution 3+ When the concentration is below 1g / L, use zi...

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Abstract

The invention discloses a method for preparing lead chloride and zinc sulfate by using mid low grade zinc oxide ores and zinc oxide-lead oxide paragenetic ores, comprising the following steps: (1) crushing zinc ores and levigating, then mixing the levigated zinc ores with ammonium sulfate and roasting; (2) dissolving out clinkers obtained by roasting, carrying out iron precipitation and aluminium precipitation on the obtained filtrate, and further separating lead from the residues of zinc extraction; (3) boiling down a zinc sulfate solution obtained after iron precipitation and aluminium precipitation for electrolysis; and (4) leaching the residues of zinc extraction with an NaCl solution to obtain a filtrate, condensing the filtrate, cooling down and crystallizing out PbCl2 crystals, and returning the NaCl solution to the leaching process. According to the invention, circulation utilization is realized.

Description

technical field [0001] The invention relates to a method for preparing lead chloride and zinc sulfate by using middle and low-grade zinc oxide ore, zinc oxide and lead oxide symbiotic ore, in particular to hemimorphite, smithsonite, willemite, zinc oxide and lead oxide symbiotic Comprehensive utilization of mines. Background technique [0002] Most zinc ores in nature exist in the form of zinc sulfide ore. The consumption of zinc sulfide concentrate in my country is huge, and the lead-zinc sulfide ore has been mined for many years, and the output is difficult to increase, which cannot meet the development requirements of zinc smelting in my country. my country is rich in zinc oxide ore resources. Yunnan Lanping lead-zinc mine contains a large amount of zinc oxide ore, which is a huge deposit with reserves of more than 10 million tons. In addition, there are 6 zinc oxide mines with reserves greater than 2 million tons. The processing and smelting of zinc oxide ore will ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/06C01G21/16
Inventor 翟玉春孙毅申晓毅王佳东辛海霞
Owner NORTHEASTERN UNIV LIAONING
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