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A method for removing fluorine and chlorine in zinc sulfate solution

A zinc sulfate solution and the technology of the solution, which are applied in the direction of improving the process efficiency and the like, can solve the problems of large loss of zinc, difficult to master process conditions, poor defluorination effect, etc., and achieve the effects of low cost, easy control of conditions and simple operation.

Active Publication Date: 2017-03-22
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for removing fluorine and chlorine in zinc sulfate solution, solve the defects of poor fluorine removal effect of copper slag and silver slag dechlorination method, large loss of zinc, and difficulty in mastering process conditions, and meet domestic and foreign requirements for electrolysis. The fluorine content in the liquid is less than 50mg / L and the chlorine content is less than 300mg / L, and the cost is low, the method is simple and easy to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: measure 1L of zinc sulfate solution that contains Zn amount and be 128.8g / L, F, Cl, Cu ion concentration are respectively 359mg / L, 1281mg / L, 1314mg / L in this zinc sulfate solution; Add bromocresol green indicator dropwise to the solution to make the solution turn yellow, then add sodium hydroxide to make the solution turn from yellow to blue, the pH value of the solution is ≥ 3.8, stir, the stirring speed is 600r / min, and the time is 10min After the reaction, continue to stir and add 0.6mg of flocculant PAM, stir at a medium speed of 200r / min for 4.5min, and stir at a slow speed of 60r / min for 10min, let it stand for 20 minutes, settle and centrifuge to separate the zinc-containing precipitate and recover it. The content of zinc in the product is 43.12%, which meets the requirements of grade 8 product ≥ 43% in the zinc concentrate quality standard YB114-82. It can be recycled, and the theoretical molar content of fluorine in the zinc sulfate solution Ca:F i...

Embodiment 2

[0018] Example 2: 1 L of zinc sulfate solution containing 128.8 g / L of Zn was measured, and the ion concentrations of F, Cl and Cu in the zinc sulfate solution were 359 mg / L, 1281 mg / L, and 1314 mg / L, respectively. First add bromocresol green indicator dropwise to the zinc sulfate solution to make the solution turn yellow, then add sodium hydroxide to turn the solution from yellow to blue, the pH value of the solution is ≥ 3.8, stir, and the stirring speed is 600r / Min, 40min to react, after the reaction, continue to stir and add flocculant PAM1.5mg, stir at a medium speed of 200r / min for 4.5min, stir at a slow speed of 60r / min for 10min, let stand for 20 minutes, settle and centrifuge to separate the zinc-containing precipitate and Recycling, the content of zinc in the zinc precipitate is 44.12%, which meets the requirements of grade 8 product ≥ 43% in the zinc concentrate quality standard YB114-82. It can be recycled, and the theoretical molar content Ca:F of fluorine in the ...

Embodiment 3

[0019]Example 3: 1 L of zinc sulfate solution containing 128.8 g / L of Zn was measured, and the concentrations of F, Cl and Cu ions in the zinc sulfate solution were 359 mg / L, 1281 mg / L, and 1314 mg / L, respectively. First add bromocresol green indicator dropwise to the zinc sulfate solution to turn the solution yellow, then add sodium hydroxide to turn the solution from yellow to blue, and the pH value of the solution is ≥ 3.8; stir at a stirring speed of 600r / Min, time 60min to react, after the reaction, continue to stir and add flocculant PAM2.5mg, stir at a medium speed of 200r / min for 4.5min, stir at a slow speed of 60r / min for 10min, let stand for 20 minutes, settle and centrifuge to separate the zinc-containing precipitate and Recycling, the content of zinc in the zinc precipitate is 45.34%, meeting the requirements of zinc concentrate quality standard YB114-82, the seventh-grade product ≥ 45%, can be recycled; according to the theoretical molar content Ca:F of fluorine i...

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Abstract

The invention belongs to the field of zinc hydrometallurgy and particularly relates to a method for removing fluorine and chlorine in a zinc sulfate solution. The method comprises steps as follows: A, adjustment of a pH (potential of hydrogen) value; B, recovery of zinc; C, fluorine removal; D, chlorine removal. According to the method, a bromocresol green indicator is adopted to control the pH value properly, and the condition is easy to control; zinc is recovered, then fluorine and chlorine are removed sequentially, and operation is simple; the defects of poor fluorine removal effect of a current copper slag and silver slag dechlorinating method, great loss of zinc, difficulty in control of technological conditions and the like are effectively overcome, the requirements that the content of fluorine in electrolyte is smaller than 50 mg / L and the content of chlorine in the electrolyte is smaller than 300 mg / L at home and abroad are met, the cost is low, and the method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the field of zinc hydrometallurgy, and in particular relates to a method for removing fluorine and chlorine in a zinc sulfate solution. Background technique [0002] At present, about four-fifths of the world's total production of refined zinc is produced by hydrometallurgy technology. With the rapid development of industrial production and the shortage of mineral resources, the impurity content of zinc concentrate produced by the domestic mining industry is getting higher and higher. Higher requirements are put forward for the adaptability of the zinc smelting system. In recent years, due to the increase of fluorine and chlorine content in raw materials, the gradual implementation of the maximum comprehensive utilization of resources and stricter environmental protection requirements, the fluorine and chlorine levels in many large-scale wet zinc smelting plant systems are on the rise. The presence of fluorine and chlorine is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B19/20
CPCY02P10/20
Inventor 吴速英张大超肖隆文陈云嫩代振鹏朱清江
Owner JIANGXI UNIV OF SCI & TECH
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