Treatment method for arsenical waste liquid
A treatment method and waste liquid technology, applied in the direction of improving process efficiency, etc., can solve the problems that arsenic-containing products cannot be properly disposed of, easily decomposed, and have high economic costs, so as to prevent uncontrollable diffusion, eliminate hidden dangers of pollution discharge, and improve economic efficiency. benefit effect
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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 uns...
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] S51.3%, As18.2%, Cu1.05%, Pb6.4%, Bi1.03%, Sb2.65%, moisture about...
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