Method for resource utilization of waste sulfuric acid wastewater produced in copper smelting and acquisition of arsenic-containing products

A technology for sewage acid wastewater and copper smelting, which is applied in metallurgical wastewater treatment, chemical instruments and methods, alkali metal sulfite/sulfite, etc. and other problems, to achieve the effects of high fluorine and chlorine removal rate, high cost and non-volatile

Active Publication Date: 2020-04-17
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical difficulties of the former are as follows: ① Due to the relatively low concentration of valuable metal elements in sewage acid, the boundary point of arsenic sulfide and other valuable metal sulfides cannot be effectively distinguished, resulting in the failure of recycling of valuable metals; ② Acid concentration Finally, the arsenic content in the concentrated solution exceeds the national standard, and further sulfuration is required to remove arsenic before it can be reused; ③The efficiency of hot air blowing off fluorine and chlorine is low, and the amount of hot air consumed is relatively large
The technical difficulties of the latter are: ① The cost of sulfidation treatme

Method used

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  • Method for resource utilization of waste sulfuric acid wastewater produced in copper smelting and acquisition of arsenic-containing products
  • Method for resource utilization of waste sulfuric acid wastewater produced in copper smelting and acquisition of arsenic-containing products
  • Method for resource utilization of waste sulfuric acid wastewater produced in copper smelting and acquisition of arsenic-containing products

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Experimental program
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Embodiment 1

[0057] In this embodiment, the sulfuric acid waste water discharged from the sulfuric acid workshop of a copper smelter in Hubei is used as the treatment object. The lead content is 650mg / L, the lead content is 30mg / L, the cadmium content is 124mg / L, the zinc content is 287mg / L, and the pH is 1.5.

[0058] A method for utilizing and obtaining arsenic-containing products from sulfuric acid waste water resources in the copper smelting industry described in this embodiment, the steps are as follows:

[0059] (1) Oxidation stage: Take 1L of polluted acid wastewater, place it in a polluted acid storage tank for air aeration, the gas-liquid ratio is 1.0, the air aeration time is 10h, and the dissolved oxygen in the solution after aeration is 9.1mg / L;

[0060] The polluted acid wastewater after aeration flows into the hydrogen peroxide reaction tank, and 8wt% hydrogen peroxide is added in two sections at the bottom of the hydrogen peroxide reaction tank. The amount of hydrogen peroxi...

Embodiment 2

[0085] In this embodiment, the sulfuric acid waste water discharged from the sulfuric acid workshop of a copper smelter in Gansu is used as the treatment object. The lead content is 200mg / L, the lead content is 60mg / L, the cadmium content is 50mg / L, the zinc content is 1407mg / L, and the pH is 0.7.

[0086] A method for utilizing and obtaining arsenic-containing products from sulfuric acid waste water resources in the copper smelting industry described in this embodiment, the steps are as follows:

[0087] (1) Oxidation stage: take 1L of polluted acid wastewater, place it in a polluted acid storage tank for air aeration, the gas-liquid ratio is 1.0, the air aeration time is 8 hours, and the dissolved oxygen in the solution after aeration is 8.7mg / L;

[0088] The polluted acid wastewater after aeration flows into the hydrogen peroxide reaction tank, and 10wt% hydrogen peroxide is added in two sections at the bottom of the hydrogen peroxide reaction tank. The amount of hydrogen p...

Embodiment 3

[0103] In this embodiment, the sulfuric acid polluted acid wastewater discharged from the sulfuric acid workshop of a copper smelter in Anhui is used as the treatment object. The lead content is 350mg / L, the lead content is 80mg / L, the cadmium content is 30mg / L, the zinc content is 430mg / L, and the pH is 0.6.

[0104] A method for utilizing and obtaining arsenic-containing products from sulfuric acid waste water resources in the copper smelting industry described in this embodiment, the steps are as follows:

[0105] (1) In the oxidation stage, take 1L of polluted acid wastewater, place it in a dirty acid storage tank for air aeration, the gas-liquid ratio is 1.0, the air aeration time is 15 hours, and the dissolved oxygen in the solution after aeration is 9.4mg / L;

[0106] The polluted acid wastewater after aeration flows into the hydrogen peroxide reaction tank, and 8wt% hydrogen peroxide is added in two sections at the bottom of the hydrogen peroxide reaction tank. The amou...

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Abstract

The invention belongs to the technical field of industrial sewage treatment, and particularly discloses a method for resource utilization of waste sulfuric acid wastewater produced in copper smeltingand acquisition of arsenic-containing products. The method comprises the following steps: 1, oxidization of trivalent arsenic: oxidizing the waste sulfuric acid wastewater by air and hydrogen peroxidein sequence; 2, separation of arsenic from fluorine and chlorine: carrying out negative pressure evaporation after oxidation to obtain a condensate A containing fluorine and chlorine, a concentratedsolution B and arsenic pentoxide crystals; 3, separation of fluorine and chlorine: absorbing the condensate A with magnesium oxide to obtain a magnesium fluoride product and diluted hydrochloric acid;4, recovery of valuable metal: adding a sodium sulfide solution into the concentrated solution B to obtain a valuable metal precipitate and arsenic-containing waste liquid C, and returning the valuable metal precipitate to a furnace for refining; and 5, crystallization: adding caustic soda flakes or recycled concentrated alkali liquor E into the arsenic-containing waste liquor C, adjusting a pH value to 13.5-14.0 to obtain a sodium arsenate product and a crystallized filtrate D, filtering the crystallized filtrate D, and conducting concentrating to obtain a sodium sulfate product and the concentrated alkali liquor E. According to the method, waste sulfuric acid wastewater is subjected to resource recycling, and arsenic pentoxide and sodium arsenate products are obtained.

Description

technical field [0001] The invention relates to the technical field of industrial sewage treatment, in particular to a method for utilizing copper smelting sulfuric acid waste water resources and obtaining arsenic-containing products. The method of the invention is suitable for the treatment of waste water with high acidity, fluorine, chlorine, arsenic and valuable metals. Background technique [0002] Sulfuric acid polluted acid widely exists in the copper smelting industry. It has the characteristics of high acidity, arsenic, fluorine, chlorine and other valuable metal elements. It is the most difficult wastewater in the copper smelting industry to treat. The traditional techniques for treating this waste water are sulfidation method and lime iron salt method, although they can all make sulfuric acid polluted acid wastewater meet the national discharge standard. However, as environmental protection laws and regulations become more and more stringent, standard discharge can...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01G28/00C01G28/02C01F5/28C01B7/07C01D5/00C02F103/16C02F101/12C02F101/14C02F101/10
CPCC01B7/0706C01D5/00C01F5/28C01G28/005C01G28/023C01P2006/80C02F1/04C02F1/5236C02F1/72C02F2101/103C02F2101/12C02F2101/14C02F2103/16
Inventor 杜冬云杜颖姚瑛瑛杜亚光郭莉王灵丹
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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