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Method for processing arsenic in nonferrous metallurgy polluted acid through steel slag treatment

A steel slag and non-ferrous technology, applied in metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of ecological environment impact, large amount of waste residue, low pH value, etc. less effect

Inactive Publication Date: 2017-01-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] With the development of my country's non-ferrous metal smelting industry, copper, lead, zinc and other smelting flue gas acid washing processes produce a large amount of dirty acid wastewater, mainly containing sulfuric acid, arsenic, mercury, cadmium, lead, zinc and fluorine and other pollutants, and smelting Compared with the wastewater produced in other processes of the process, the sewage acid wastewater has complex components, extremely low pH value, and the content of various heavy metals is dozens of times higher. The treatment and reuse of sewage acid wastewater is a major problem in the field of environmental protection. Currently, the most widely used treatment method Mainly include lime neutralization method, high concentration mud method, vulcanization method, ferrite method, membrane separation method, biological adsorption method, vulcanization method + lime / limestone neutralization method, high concentration mud method + iron salt neutralization method, lime + Iron salt (aluminum salt) method, these methods usually have disadvantages such as high processing cost, poor effect, large amount of waste residue and difficult recycling
[0004] Steel slag is the waste slag produced in the process of steelmaking. It has a high temperature (about 1600°C), is alkaline in contact with water, and has a pH value of 10~12. Its mineral phase composition is similar to that of cement clinker, and it is a highly active Materials. In 2012, the annual output of steel slag in my country reached more than 100 million tons. After years of research, domestic iron and steel enterprises, scientific research institutions and building materials companies have made some progress in the utilization of steel slag. Steel slag has been successfully used in building materials and road engineering. However, the comprehensive utilization rate of steel slag in my country is still low, only about 10%. At present, steel slag is still mainly piled up, occupying a large amount of land and affecting the ecological environment

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  • Method for processing arsenic in nonferrous metallurgy polluted acid through steel slag treatment

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Experimental program
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Effect test

Embodiment 1

[0020] The method described in this embodiment utilizes steel slag to treat arsenic in non-ferrous metallurgical sewage acid, wherein the steel slag is steel slag from a certain steelmaking plant, and the specific components and contents are shown in Table 2, and the non-ferrous metallurgical sewage acid is certain copper smelting plant sewage acid, specific components and content See Table 3, the processing includes the following steps:

[0021] (1) Pretreatment of non-ferrous metallurgical sewage acid: take 100mL of non-ferrous metallurgical sewage acid wastewater and put it in a plastic bucket, let it settle for 24 hours, take the supernatant for detection, the test result: the pH value is 0.81, the non-ferrous metallurgical sewage acid Filter, add steel slag to the filtrate, adjust the pH value to 6.5, remove some arsenic, zinc and other substances by precipitation, and perform solid-liquid separation;

[0022] (2) Steel slag pretreatment, the specific method is as follows...

Embodiment 2

[0032] The method described in this embodiment utilizes steel slag to treat arsenic in nonferrous metallurgical sewage acid, wherein the steel slag is steel slag from a certain steelmaking plant, the nonferrous metallurgical sewage acid is certain lead smelting plant sewage acid, and the arsenic content is 12.34g / L, specifically comprising the following steps :

[0033] (1) Pretreatment of non-ferrous metallurgical sewage acid: Take 100mL of non-ferrous metallurgical sewage acid wastewater produced in the process of copper smelting, put it in a plastic bucket, let it settle for 24 hours, and take the supernatant for testing. The test result: the pH value is 0.43 , filter non-ferrous metallurgical sewage acid, add steel slag to the filtrate, adjust the pH value to 7, precipitate and remove some arsenic, zinc, lead and other substances, and perform solid-liquid separation;

[0034] (2) Steel slag pretreatment, the specific method is as follows:

[0035] A. Dry the steel slag, g...

Embodiment 3

[0040] The method described in this embodiment utilizes steel slag to treat arsenic in nonferrous metallurgical sewage acid, wherein the steel slag is steel slag from a certain steelmaking plant, the nonferrous metallurgical sewage acid is certain zinc smelting plant sewage acid, and the arsenic content is 15.5g / L, specifically comprising the following steps :

[0041] (1) Pretreatment of non-ferrous metallurgical sewage acid: the non-ferrous metallurgical sewage acid was left to settle in the sedimentation tank for 24 hours, and the supernatant was taken for testing. The test result: the pH value was 0.53. Steel slag is added to the treatment tank 1, the pH value is adjusted to 7.5, some arsenic, zinc and other substances are removed by precipitation, solid-liquid separation is carried out, and the filtrate enters the treatment tank 2;

[0042] (2) Steel slag pretreatment, the specific method is as follows:

[0043] A. Dry the steel slag, grind it with a ball mill and pass i...

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Abstract

The invention discloses a method for processing arsenic in nonferrous metallurgy polluted acid through steel slag treatment. The method includes the steps of putting in steel slag to adjust the pH of nonferrous metallurgy polluted acid, preprocessing the steel slag, putting nonferrous metallurgy polluted acid and preprocessed steel slag in preprocessed polluted acid wastewater according to the volume mass ratio of 100 mL:(1.5-3.0) g to be stirred for 1.5-2 hours at a temperature of 35-50 DEG C, conducting static settlement for 8-10 hours, centrifugally separating supernate, detecting the content of arsenic in filtrate, and entering the next treatment process if the content meets the national standard. The method has the advantages that the raw materials are low in price, steel slag can be easily obtained, water quality adaptability is high, the technological process is short, operation is easy, treatment expenditures are low, actual requirements of enterprises are met, the characteristics of the steel slag are used, other reagents are little added, cost is low, oxidization is not needed, slag amount is small, and stability is achieved; the comprehensive utilization of the steel slag and the purification treatment of nonferrous metallurgy polluted acid are achieved.

Description

technical field [0001] The invention relates to a method for treating arsenic in non-ferrous metallurgical sewage acid by using steel slag, and belongs to the technical field of comprehensive utilization of metallurgical resources. [0002] technical background [0003] With the development of my country's non-ferrous metal smelting industry, copper, lead, zinc and other smelting flue gas acid washing processes produce a large amount of dirty acid wastewater, mainly containing sulfuric acid, arsenic, mercury, cadmium, lead, zinc and fluorine and other pollutants, and smelting Compared with the wastewater produced in other processes of the process, the sewage acid wastewater has complex components, extremely low pH value, and the content of various heavy metals is dozens of times higher. The treatment and reuse of sewage acid wastewater is a major problem in the field of environmental protection. Currently, the most widely used treatment method Mainly include lime neutralization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/62C02F103/16C02F101/20
CPCC02F1/58C02F1/62C02F2101/103C02F2209/06C02F2101/20C02F2103/16
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