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Method for treating heavy metal arsenic in colored metallurgy polluted acid

A technology of heavy metal and polluted acid, applied in the field of environmental engineering, can solve the problems of difficult recycling, high treatment cost, complex composition, etc., and achieve the effects of low price, simple operation and low cost

Inactive Publication Date: 2017-01-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the development of my country's non-ferrous metal smelting industry, the harmless treatment of arsenic-containing polluted acid produced in the smelting process has become a major environmental problem to be solved urgently in my country's non-ferrous metallurgical process, such as copper, lead, zinc and other smelting flue gas The acid washing process will produce a large amount of dirty acid wastewater, mainly containing sulfuric acid, arsenic, mercury, cadmium, lead, zinc and fluorine and other pollutants. It is extremely low, and the content of various heavy metals is dozens of times higher. The treatment and reuse of polluted acid wastewater is a major problem in the field of environmental protection. At present, the commonly used treatment methods mainly include lime neutralization, high-concentration mud Bulk method, membrane separation method, biological adsorption method, sulfuration method + lime / limestone neutralization method, high-concentration mud method + iron salt neutralization method, these methods usually have high treatment cost, poor effect, produce a large amount of waste residue and are difficult to recycle Therefore, research and development of a comprehensive utilization technology of heavy metal arsenic in non-ferrous metallurgical sewage acid can make arsenic-containing wastewater resource, reduce the treatment cost of arsenic-containing wastewater, and have great social, environmental and economic benefits.

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  • Method for treating heavy metal arsenic in colored metallurgy polluted acid
  • Method for treating heavy metal arsenic in colored metallurgy polluted acid
  • Method for treating heavy metal arsenic in colored metallurgy polluted acid

Examples

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Effect test

Embodiment 1

[0025] The method for processing heavy metal arsenic in the non-ferrous metallurgical sewage acid described in this embodiment, the specific processing method includes the following steps:

[0026] (1) Take 5000mL of polluted acid wastewater produced during the copper smelting process of a certain factory and put it in a plastic bucket. After 24 hours of static precipitation, take the supernatant for testing. The test results: see Table 2 for the heavy metal content, and the acidity of the polluted acid is 150g / L, take 500mL of the supernatant and place it in a 1000mL Erlenmeyer flask, add limestone, stir at 80°C for 2h at a stirring speed of 150r / min, adjust the pH value of the filtrate to 1, and carry out solid-liquid separation. The composition and content are shown in Table 3, which meets the emission standards;

[0027] (2) Detection step (1) The content of arsenic in the filtrate after solid-liquid separation, according to the molar ratio of iron ion and arsenic ion is ...

Embodiment 2

[0034] The method for processing heavy metal arsenic in the non-ferrous metallurgical sewage acid described in this embodiment, the specific processing method includes the following steps:

[0035] (1) Take 5000mL of polluted acid wastewater produced during the lead smelting process of a certain factory and place it in a plastic bucket. After 24 hours of static precipitation, take the supernatant for testing. The test results: the concentration of arsenic is 13.4g / L, and the acidity of polluted acid 120g / L, take 500mL of the supernatant and place it in a 1000mL Erlenmeyer flask, add limestone, stir at 70°C for 1h at a stirring speed of 180r / min, adjust the pH value to 0.5, carry out solid-liquid separation, filter residue XRD detection, such as figure 1 As shown, the generated product is calcium sulfate and calcium sulfate hydrate;

[0036] (2) Detection step (1) The content of arsenic in the filtrate after solid-liquid separation, according to the molar ratio of iron ion and...

Embodiment 3

[0039] The method for processing heavy metal arsenic in the non-ferrous metallurgical sewage acid described in this embodiment, the specific processing method includes the following steps:

[0040] (1) The polluted acid wastewater produced during the zinc smelting process of a certain factory was placed in a sedimentation tank, and after 24 hours of static precipitation, the supernatant was taken for testing. The test results: the arsenic concentration was 12.9g / L, and the acidity of the polluted acid was 130g / L, inject the supernatant into the treatment tank 1, add limestone, stir at 60°C for 1.5h, the stirring speed is 200r / min, adjust the pH value to 0, and carry out solid-liquid separation;

[0041] (2) Introduce the supernatant from step (1) into treatment tank 1, detect the content of arsenic, add iron sulfate and add sodium hydroxide to adjust the pH value according to the molar ratio of iron ions and arsenic ions at a ratio of 2:1. To 5, stir at 80°C at a speed of 200...

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Abstract

The invention discloses a method for treating heavy metal arsenic in colored metallurgy polluted acid. The method includes the steps that limestone is added, the pH value of the colored metallurgy polluted acid is adjusted to be 0 to 1, the product is stirred for 1 h to 2 h at the temperature of 60 DEG C to 80 DEG C, and then solid-liquid separation is carried out; a certain amount of ferric sulfate is added into filtered liquid, the pH value is adjusted to be 1.5 to 5, the product is stirred for 6 h to 12 h at the temperature of 60 DEG C to 90 DEG C, and then solid-liquid separation is carried out; a certain amount of flocculating agent is added into filtered liquid, the mixture is stirred for 1 h to 3 h, then solid-liquid separation is carried out, and the filtered liquid is detected to meet the standard to enter the next process. According o the method, the colored metallurgy polluted acid is neutralized through lime, the cost of the raw materials is low, the adaptability of the water quality is high, the technology process is short, the treating cost is low, and the actual requirements of enterprises are met; compared with the prior art, strong oxidant is not added into the method, oxidation is not required, the final product slag quantity is small and stable, and safe purification treatment of the heavy metal arsenic in the colored metallurgy polluted acid is achieved.

Description

technical field [0001] The invention relates to a method for treating heavy metal arsenic in nonferrous metallurgical sewage acid, belonging to the field of environmental engineering. [0002] technical background [0003] With the development of my country's non-ferrous metal smelting industry, the harmless treatment of arsenic-containing polluted acid produced in the smelting process has become a major environmental problem to be solved urgently in my country's non-ferrous metallurgical process, such as copper, lead, zinc and other smelting flue gas The acid washing process will produce a large amount of dirty acid wastewater, mainly containing sulfuric acid, arsenic, mercury, cadmium, lead, zinc and fluorine and other pollutants. It is extremely low, and the content of various heavy metals is dozens of times higher. The treatment and reuse of polluted acid wastewater is a major problem in the field of environmental protection. At present, the commonly used treatment methods ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/14C02F103/16C02F101/20
CPCC02F9/00C02F2101/20C02F2103/16C02F1/5236C02F1/66C02F1/56C02F3/34
Inventor 祝星韦龙华祁先进王华魏永刚李孔斋胡建杭
Owner KUNMING UNIV OF SCI & TECH