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A kind of treatment method of arsenic-containing waste liquid

A treatment method and waste liquid technology, applied in the direction of improving process efficiency, can solve the problems that arsenic-containing products cannot be properly disposed of, are prone to decomposition, and have high economic costs. effect of benefit

Active Publication Date: 2018-01-19
ULTRA MINOR METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most factories can only use a single technology to remove arsenic, and the result is that arsenic-containing products cannot be properly disposed of (such as arsenic sulfide produced by sulfidation precipitation method, calcium arsenate produced by calcium salt method, which cannot be further disposed of, You can only choose to stack or transfer, but neither arsenic sulfide nor calcium arsenate is a stable arsenic compound, which is easy to decompose and cause secondary pollution to air and water), or the cost of arsenic removal is too high and you can only choose to stack or violate the law Sneak discharge (Although the arsenic-iron co-precipitation produced by the iron salt precipitation method has good stability, it can be safely landfilled, but the economic cost is high when used to remove high arsenic, and it cannot be recycled)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Taking the process of producing sulfuric acid from flue gas of a copper flash furnace in a large-scale copper smelter in China as an example, the arsenic in the concentrate is volatilized into the flue gas as arsenic oxide after roasting, and part of it enters with the flue gas of sulfur dioxide after dust collection. The polluted acid in the acid making process, the polluted acid forms arsenic-containing waste liquid and needs to be purified to remove impurities. The polluted acid treatment method provided by the invention is as follows:

[0040] (1) A certain amount of sulfide is added to the polluted acid for sulfidation treatment to form a precipitated arsenic-sulfur-copper mixed slag material. After solid-liquid separation, the dearsenic solution is transferred to the wastewater treatment tank, and iron salt is added to form scorodite precipitation. For the purpose of removing arsenic, the added sulfide is hydrogen sulfide;

[0041] (2) Analysis of arsenic-sulfur-c...

Embodiment 2

[0051] Taking the process of producing sulfuric acid from flue gas from lead concentrate smelting in a bottom-blown furnace in a large lead-zinc smelter in Guangxi as an example, the composition and amount of flue gas (into purified flue gas) are as follows:

[0052] ingredients

SO 2

SO 3

O 2

CO 2

N 2

h 2 o

total

m 3 / h

1687

36

3537

430

13145

2445

21280

％

7.93

0.17

16.62

2.02

61.77

11.49

100

[0053] In addition: Dust in the flue gas≤0.5g / m 3 , which contains arsenic 13.22kg / h. Sulfuric acid discharge from sulfuric acid workshop is 6m 3 / h, which contains H 2 SO 4 3%, containing 2.40g / L arsenic, sent to the sewage acid treatment station for treatment, the original treatment method is to add lime to generate CaAsO 4 Precipitation removes arsenic, separates arsenic-calcium slag and stacks it in a special area. Due to the accumulation of time and the unstable chemical pr...

Embodiment 3

[0066] The source of polluted acid is identical with embodiment 2, and processing method adopts following operating steps:

[0067](1) According to the analysis of the dynamic data of the content of arsenic, lead, antimony, bismuth, etc. in the polluted acid, a certain amount of sulfide is added for vulcanization treatment to form a precipitated arsenic-sulfur-copper mixed slag. The temperature of the vulcanization treatment is controlled at 50°C, and the treatment time is controlled In 1h, after solid-liquid separation, the dearsenic solution is transferred to the wastewater regulating tank, combined with other workshop wastewater sources, and iron salt is added to form scorodite precipitation to achieve the purpose of deep arsenic removal. The added sulfides are hydrogen sulfide, sulfide A mixture of sodium and ammonium sulfide;

[0068] (2) Analysis of arsenic and sulfur slag content is as follows:

[0069] S 51.3%, As 18.2%, Cu 1.05%, Pb 6.4%, Bi 1.03%, Sb 2.65%, moisture...

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Abstract

The invention provides a treatment method for arsenical waste liquid, which comprises the following steps: (A) performing sulfurization treatment of arsenical waste liquid to obtain arsenic-sulfur-copper mixed slag; (B) performing concentrated sulfuric acid oxidation treatment of the arsenic-sulfur-copper mixed slag to obtain sulfur precipitate and mother liquid; (C) recycling the sulfur precipitate to prepare concentrated sulfuric acid and / or a sulfurization agent, performing crystallization treatment of the mother liquid to separate out arsenic oxide, and continuing to perform purification treatment of arsenic oxide; and (D) enabling the mother liquid subjected to crystallization treatment to circulate back to step (A) to be mixed with arsenical waste liquid repeatedly, and directly extracting elemental copper from the mother liquid when the copper element enrichment concentration in the mother liquid is up to 100-120 g / L. The treatment method for arsenical waste liquid, provided by the embodiment of the invention, is simple, is easy to operate has mild operation conditions, realizes safe and innocent treatment of arsenic pollution, can recycle elemental metal from waste liquid and creates a certain economic value.

Description

technical field [0001] The invention relates to the fields of waste liquid treatment and metal element recovery, in particular to a treatment method for arsenic-containing waste liquid. Background technique [0002] Arsenic, commonly known as arsenic, is a non-metallic element, located in the 4th period, group VA, atomic number 33, and element symbol As in the periodic table of chemical elements. Arsenic is a carcinogen that is toxic to the human body and other organisms, and its fatal dose of acute poisoning is 0.2-0.6g. Arsenic poisoning is mainly caused by arsenic compounds. The toxicity of trivalent arsenic compounds is stronger than that of pentavalent arsenic. Among them, poisoning by arsenic trioxide (commonly known as arsenic), which is more toxic, is more common. Poisoning can occur after oral administration of 0.01-0.05g. 0.76-1.95mg / kg. Arsenic compounds can also be poisoned through skin or wound absorption. Long-term exposure to arsenic can cause chronic poiso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B30/04C22B7/00
CPCY02P10/20
Inventor 秦寒梅
Owner ULTRA MINOR METALS
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