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Acid recycling and arsenic curing method for acidic waste water

A solidification method and resource utilization technology, applied in chemical instruments and methods, separation methods, water pollutants, etc., can solve the problems of unresourced acid utilization, inconvenient disposal of arsenic sulfide precipitation, long process flow, etc., and achieve easy industrialization The effect of implementation, high resource utilization rate and short process flow

Inactive Publication Date: 2017-12-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a long process flow, and the acid in the sewage acid has not been utilized as a resource, and the arsenic sulfide precipitate formed at the same time is not easy to dispose of

Method used

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  • Acid recycling and arsenic curing method for acidic waste water
  • Acid recycling and arsenic curing method for acidic waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, the resource utilization of the acid in the polluted acid and the solidification method of the arsenic, the arsenic fume and the polluted acid are slurried, and then air or oxygen is introduced for oxidation leaching, the pH value of the leaching end point is controlled, and the arsenic-containing leaching solution is subjected to normal pressure Scoorite arsenic fixation, the specific steps are as follows:

[0019] Step 1, at first the polluted acid (its main chemical composition is: As1g / L, H 2 SO 4 5.5g / L) and arsenic dust (the main chemical mass percentage components are: As0.54%, Cu0.48%, Zn0.54% and Pb0.55%) were mixed and adjusted according to the liquid-solid ratio of 2:1mL / g Slurry, and add sulfuric acid with a concentration of 98% at 20% of the mass fraction of arsenic soot, and carry out oxidation leaching for 1 hour at a temperature of 75°C, an oxygen flow rate of 1.5L / min, an end point pH of 0, and a stirring speed of 300r / min. ...

Embodiment 2

[0023] Such as figure 1 As shown, the resource utilization of the acid in the polluted acid and the solidification method of the arsenic, the arsenic fume and the polluted acid are slurried, and then air or oxygen is introduced for oxidation leaching, the pH value of the leaching end point is controlled, and the arsenic-containing leaching solution is subjected to normal pressure Scoorite arsenic fixation, the specific steps are as follows:

[0024] Step 1, at first the polluted acid (its main chemical composition is: As6g / L, H 2 SO 4 60.4g / L) and arsenic dust (the main chemical mass percentage components are: As10.01%, Cu1.34%, Zn9.76% and Pb10.53%) were mixed and adjusted according to the liquid-solid ratio of 5:1mL / g Slurry, and add sulfuric acid with a concentration of 98% at 10% of the mass fraction of arsenic soot, and carry out oxidation leaching for 3 hours at a temperature of 95 ° C, an air flow rate of 6 L / min, an end point pH of 0.2, and a stirring speed of 300 r / ...

Embodiment 3

[0028] Such as figure 1 As shown, the resource utilization of the acid in the polluted acid and the solidification method of the arsenic, the arsenic fume and the polluted acid are slurried, and then air or oxygen is introduced for oxidation leaching, the pH value of the leaching end point is controlled, and the arsenic-containing leaching solution is subjected to normal pressure Scoorite arsenic fixation, the specific steps are as follows:

[0029] Step 1. First, the dirty acid (its main chemical composition is: As20g / L, H 2 SO 4 400g / L) and arsenic dust (the main chemical mass percentage components are: As8.45%, Cu15.02%, Zn8.21% and Pb25%) are mixed and slurried according to the liquid-solid ratio of 1:1mL / g, and Add sulfuric acid with a concentration of 98% at 0% of the mass fraction of arsenic fumes, carry out oxidation leaching for 6 hours at a temperature of 85°C, an oxygen flow rate of 10L / min, an end point pH of 1.0, and a stirring speed of 500r / min. Liquid-solid s...

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Abstract

The invention relates to an acid recycling and arsenic curing method for acidic waste water and belongs to the technical field of the non-ferrous metallurgical industry. The acid recycling and arsenic curing method comprises the following steps: performing size mixing on arsenic soot and acidic waste water, then pumping in air or oxygen to perform oxidation leaching, controlling the pH value of a leaching end point, and performing normal-pressure scorodite arsenic curing on an arsenic-containing leaching agent. According to the acid recycling and arsenic curing method, arsenic-containing soot and acidic waste water mixed size mixing, oxidation leaching and scorodite arsenic curing technologies are adopted to treat acidic waste water, a new thought is provided for recycling of acidic waste water and harmless arsenic treatment of the non-ferrous metallurgical industry, and the acid recycling and arsenic curing method mainly focuses on efficient utilization of acid in acidic waste water and harmless arsenic treatment. Arsenic-containing soot generated in the non-ferrous metal smelting process is taken as a neutralizer, and arsenic-containing soot and arsenic-containing acidic waste water are synchronously treated, so that effective utilization of acid in acidic waste water is realized, meanwhile, obtained scorodite crystals are convenient to pile up, and the characteristics of complete arsenic and acid separation, low treatment cost and the like are achieved.

Description

technical field [0001] The invention relates to a resource utilization of acid in polluted acid and a method for solidifying arsenic, belonging to the technical field of nonferrous metallurgy industry. Background technique [0002] In pyrite or non-ferrous metal smelting sulfur dioxide flue gas acid production system, the flue gas needs to be washed and purified before acid production. During the washing process, the arsenic, cadmium, copper and fluorine in the flue gas and dust Pollutants such as pollutants enter the dilute acid, in order to prevent substances such as arsenic and fluorine from accumulating in the dilute acid, a certain amount of dilute acid must be discharged regularly during production. Because of its high acidity, smelting enterprises generally call it "polluted acid". The polluted acid has the characteristics of high acidity, high arsenic content, many types of heavy metals (including copper, zinc, lead, cadmium, etc.) and high concentration, and has be...

Claims

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Application Information

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IPC IPC(8): C02F9/04C22B7/02C22B30/04C22B19/30C22B19/20C22B15/00B01D53/78B01D53/64C02F101/10C02F103/16
CPCB01D53/64B01D53/78C22B7/007C22B7/02C22B15/0071C22B19/22C22B19/30C22B30/04C02F9/00C02F1/001C02F1/66C02F1/72C02F2103/16C02F2101/103B01D2258/025Y02P10/20
Inventor 李旻廷魏昶邓志敢李兴彬樊刚
Owner KUNMING UNIV OF SCI & TECH
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