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A method for resource utilization of copper smelting sulfuric acid polluted acid wastewater and obtaining 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 effect of high fluorine and chlorine removal rate, non-volatile and expensive

Active Publication Date: 2021-11-05
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 treatment is relatively high, and the generated arsenic sulfide slag is extremely difficult to handle
②At the same time of negative pressure evaporation, arsenic and fluorine and chlorine enter the condensate together, and the proportion of arsenic escaping into the condensate can reach up to 20%, which makes the condensate unable to be reused and can only be treated by adding calcium, resulting in more (Shen Dianbang. Research on the treatment technology of dirty acid produced by flue gas acid production in non-ferrous smelting [C] 2011.) and (Liu Xiaolai. Experimental research on removal of fluorine, chlorine and arsenic by evaporation and concentration of dirty acid in copper smelting [D ].2014.)

Method used

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  • A method for resource utilization of copper smelting sulfuric acid polluted acid wastewater and obtaining arsenic-containing products
  • A method for resource utilization of copper smelting sulfuric acid polluted acid wastewater and obtaining arsenic-containing products
  • A method for resource utilization of copper smelting sulfuric acid polluted acid wastewater and obtaining arsenic-containing products

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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 specifically discloses a method for utilizing copper smelting sulfuric acid polluted acid wastewater resources and obtaining arsenic-containing products. 2. Separation of arsenic and fluorine and chlorine: After oxidation, carry out negative pressure evaporation to obtain condensate A, concentrate B and diarsenic pentoxide crystals containing fluorine and chlorine. 3. Separation of fluorine and chlorine: Absorb condensate A with magnesium oxide to obtain magnesium fluoride product and dilute hydrochloric acid. 4. Recovery of valuable metals: Add sodium sulfide solution to the concentrated solution B to obtain valuable metal precipitates and arsenic-containing waste liquid C. The valuable metal precipitates can be returned to the furnace for extraction. 5. Crystallization: add caustic soda or recycled concentrated lye E to the arsenic-containing waste liquid C, adjust the pH to 13.5-14.0, and obtain sodium arsenate product and crystallization filtrate D, and obtain sodium sulfate product after the crystallization liquid is filtered and concentrated and concentrated lye E. The invention recycles sulfuric acid polluted acid waste water as resources, and obtains diarsenic pentoxide and sodium arsenate products.

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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Patent Type & Authority Patents(China)
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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