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Method for resource utilization of waste acid with arsenic and fluorine import

A technology for recycling and polluting acid, applied in chemical instruments and methods, aluminum fluoride, arsenic compounds, etc., can solve the problems of increased environmental pollution load, a large amount of waste sludge, no utilization, etc., and achieves fewer reaction steps and simple process. , easy to handle effect

Inactive Publication Date: 2017-02-15
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, neutralization precipitation method, chemical coagulation precipitation method, etc. are commonly used to treat smelting arsenic-containing and fluorine-containing polluted acid, but this method does not utilize arsenic and fluorine, and produces a large amount of waste sludge, which increases the environmental pollution load and produces secondary pollution.

Method used

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  • Method for resource utilization of waste acid with arsenic and fluorine import
  • Method for resource utilization of waste acid with arsenic and fluorine import

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take a certain amount of dirty acid containing arsenic and fluorine, add solid sodium hydroxide to precipitate and remove impurities, the amount of solid sodium hydroxide added is based on adjusting the pH value of the dirty acid to 6, and stir at room temperature for 30 minutes. Filter and keep the filtrate.

[0043] Add solid copper sulfate to the filtrate in such an amount that the molar ratio of Cu and As is 1.5:1. While stirring, a sodium hydroxide solution with a mass fraction of 25% was added dropwise, the pH was controlled to be 8, and the reaction was stirred at 40° C. for 30 minutes. Filter to obtain filter cake A and filtrate A. Filter cake A is leached with dilute sulfuric acid with a mass fraction of 15%, the liquid-solid ratio (mL / g) is 4:1 during leaching, the leaching reaction is 45min, and SO is passed into the leaching solution 2 Gas, reduced reaction at room temperature for 45 minutes, filtered, and retained filtrate B. After the filtrate B was eva...

Embodiment 2

[0047]Take a certain amount of dirty acid containing arsenic and fluorine, add solid sodium hydroxide to precipitate and remove impurities, the amount of solid sodium hydroxide added is based on adjusting the pH value of the dirty acid to 6, and stir at room temperature for 20 minutes. Filter and keep the filtrate.

[0048] Add solid copper sulfate to the filtrate in such an amount that the molar ratio of Cu and As is 1.5:1. While stirring, a sodium hydroxide solution with a mass fraction of 25% was added dropwise to control the pH to 9, and the reaction was stirred at 50° C. for 45 minutes. Filter to obtain filter cake A and filtrate A. Filter cake A is leached with dilute sulfuric acid with a mass fraction of 15%, the liquid-solid ratio (mL / g) during leaching is 5:1, the leaching reaction is 60min, and SO is passed into the leaching solution 2 Gas, reduction reaction at room temperature for 60min, filter, and keep the filtrate B. After the filtrate B was evaporated and cr...

Embodiment 3

[0052] Take a certain amount of dirty acid containing arsenic and fluorine, add solid sodium hydroxide to precipitate and remove impurities, the amount of solid sodium hydroxide added is based on adjusting the pH value of the dirty acid to 6, and stir at room temperature for 30 minutes. Filter and keep the filtrate.

[0053] Add solid copper sulfate to the filtrate in such an amount that the molar ratio of Cu and As is 1.5:1. While stirring, sodium hydroxide solution with a mass fraction of 25% was added dropwise, the pH was controlled to be 8, and the reaction was stirred at 60° C. for 60 min. Filter to obtain filter cake A and filtrate A. The filter cake A is leached with dilute sulfuric acid with a mass fraction of 15%, the liquid-solid ratio (mL / g) is 6:1 during leaching, the leaching reaction is 60min, and SO is passed into the leaching solution 2 Gas, reduction reaction at room temperature for 60min, filter, and keep the filtrate B. After the filtrate B was evaporated...

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Abstract

The invention relates to a method for resource utilization of waste acid with arsenic and fluorine import. The method for resource utilization of waste acid with arsenic and fluorine import comprises the steps that dropping hydroxide precipitation in the waste acid, settling and removing weight metal ions and impurities therein, filtrating, and retaining the filtrate; dropping copper salt in the said filtrate, and dripping the hydroxide, stirring and reacting, filtrating and resulting in filtrate cake A, and filtrate A; leaching the filtrate cake A with diluted sulfuric acid, passing the reduction gas into leaching liquid, filtrating after the reduction reaction, retaining filtrate B; evaporating and crystallizing the filtrate B, water rinsing and roasting drying, and resulting in arsenic trioxide; dripping H2SO4 in the said filtrate and regulating filtrate pH, mixing with salt and aluminum salt, stirring and reacting, crystallizing, filtrating and resulting in cake B, and filtrate C; after purifying and rinsing the filter cake B, roasting dry, and resulting in cryolite; dropping lime milk in filtrate C, stirring and reacting, and filtrating; mixing adsorbent in the filtrate, adsorbing and reacting, filtrating, and resulting in standard criterion waste water. The invention has the advantages of process simplicity, reaction process reduction and control of operating conditions easiness.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial waste resources, and specifically relates to a method for recycling and utilizing integrated resources of arsenic and fluorine in arsenic-containing and fluorine-containing polluted acid produced in a smelting industry. Background technique [0002] The arsenic-containing and fluorine-containing polluted acid produced in the smelting industry mainly comes from the purification process of the smelting flue gas acid production process. Before the smelting flue gas enters the acid production stage, the high-temperature flue gas is purified and washed. The washing liquid is the arsenic-containing and fluorine-containing sewage. Acid, mainly containing arsenic, fluoride, sulfuric acid and heavy metals copper, cadmium, lead, etc. At present, neutralization precipitation method, chemical coagulation precipitation method, etc. are commonly used to treat smelting arsenic-containing an...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G28/00C01F7/54C02F101/14C02F101/10
CPCC02F9/00C01F7/54C01G28/005C02F1/283C02F1/66C02F1/70C02F2101/103C02F2101/14
Inventor 张莉李兰田凌霄
Owner WUHAN INSTITUTE OF TECHNOLOGY
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