Method for removing arsenic and antimony in industrial wastewater by using smelting furnace slag
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A technology for industrial wastewater and slag, which is applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as difficult to sell, easy to dissolve, low level of resource utilization, etc., to reduce treatment costs and chemical properties Stable, easy-to-use effects
Inactive Publication Date: 2014-02-05
HONGHE COLLEGE
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This method of treating wastewater containing arsenic and antimony, especially wastewater containing high arsenic and antimony, has major problems such as high cost, long time, large amount of slag, strong toxicity of slag, easy dissolution and secondary pollution, and the quality of the treated water cannot be discharged up to standard. , need to take further deep purification treatment
[0004] The smelting slag produced in the process of pyrometallurgy is divided into quenching water quenching slag, natural cooling slag and thermal insulation cooling slag, t
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[0025] Example 1. The flue gas cleaning scrubber of a lead fire smelting furnace contains As 9.42g / L and Sb 1.34g / L, whichever is 1L, add sulfuric acid to adjust the acidity, and control pH=2.5.
[0026] Add 50g of pre-crushed 100-mesh lead smelting water quenching slag, main components: Fe 26.3%, Zn 3.4%, Si 11.5%, Ca 3.9%, Al 0.9%, Mg 2.5%, As 0.08%, Sb 0.18%; then Add 19g of oxidant manganese dioxide.
[0027] The solution was heated to 60°C, and the temperature was kept for 2.5 hours.
[0028] Add neutralizing agent magnesium oxide for neutralization and control pH=7.
[0029] The solution is filtered, and the filtrate obtained contains As 0.17mg / L and Sb 0.38mg / L. This is a qualified filtrate, which is sent to the sewage treatment system for purification to further remove other impurities. The removal rate of arsenic and antimony in wastewater is close to 100%.
[0030] The filtered residue is sent to the residue yard for storage.
Example
[0031] Example 2. The flue gas purification scrubbing liquid of a copper fire smelting furnace contains 20.78g / L of As and 0.79g / L of Sb, 1L of which is added with nitric acid to adjust the acidity and control pH=3.5. 40g of tailing iron slag (150 mesh) produced by adding copper smelting slag after slag selection, main components: Fe42.5%, Zn 2.1%, Cu 0.34%, Si 14.6%, Ca 4.5%, Al 1.4% , Mg 0.9%, As 0.09%, Sb 0.08%; then add 45ml of oxidant hydrogen peroxide.
[0032] The solution was heated to 95°C and kept for 1h. Add neutralizer sodium carbonate for neutralization and control pH=8.
[0033] The solution is filtered to obtain the filtrate containing As 0.24mg / L and Sb 0.33mg / L. This is a qualified filtrate, which is sent to the sewage treatment system for purification to further remove other impurities. The removal rate of arsenic and antimony in wastewater is close to 100%.
[0034] The filtered residue is sent to the residue yard for storage.
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Abstract
The invention relates to a method for removing arsenic and antimony in industrial wastewater by using smelting furnace slag. The method comprises the following steps: adding acid to the industrial wastewater containing more than 10mg/L of As and more than 10mg/L of Sb so as to adjust the acidity, and controlling the pH to 0.5-4; adding the smelting furnace slag and an oxidizing agent, enabling the smelting furnace slag to chemically react with or physically adsorb As<3+> and Sb<3+> in the wastewater under acidity and oxidation atmospheres, controlling the temperature at 40-100 DEG C, and carrying out heat preservation reaction for 1-3 hours; adding a neutralizing agent for neutralization, and controlling the pH to 6-9; filtering a solution so as to obtain filtrate and filter residues, if the As contained in the filtrate is less than 0.3mg/L and Sb contained in the filtrate is less than 0.5mg/L, meeting the residue removal standards, feeding the filtrate to a wastewater treatment system for further purifying other impurities, if the As contained in the filtrate is more than 0.3mg/L and the Sb contained in the filtrate is more than 0.5mg/L, repeating the steps till meeting the residue removal standards, and sending the filtrate residues to a filter residue yard for storage. The method has the advantages that the smelting furnace slag is used for replacing a precipitant so as to remove impurities, the arsenic and the antimony in the wastewater are rapidly and efficiently removed within 1 to 3 hours, the removal rate is close to 100%, the method is high in efficiency and low in cost, and the filter residues have good crystal structures, are easy to clarify and filter and contain arsenate and antimonite formed by iron, calcium, magnesium, aluminium, pentavalent arsenic and pentavalent antimony and have stable chemical property.
Description
technical field [0001] The invention belongs to waste water purification technology, in particular to a method for removing arsenic and antimony in industrial waste water by using smelting slag. Background technique [0002] During the wet and pyrometallurgical smelting process of various metals, waste water of harmful elements arsenic and antimony is easy to be produced, and the content of arsenic and antimony can sometimes reach 1~20g / L or even higher. For example, flue gas containing sulfur dioxide, arsenic oxides, and antimony oxides is produced in pyrometallurgy furnaces. The flue gas is purified and washed by multi-stage dynamic waves to obtain high-purity sulfur dioxide, which is then sent to the acid system for recovery and preparation of sulfuric acid. In the above-mentioned flue gas purification and washing process, acidic wastewater containing arsenic and antimony with high concentration (0.5~15g / L) will inevitably be produced. For another example, in the wet pro...
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