Method for purifying smelting waste acid

A dirty acid and zinc smelting technology, applied in the direction of sulfur trioxide/sulfuric acid, etc., can solve the problems of high operating cost, complex process, and many equipment, and achieve the effects of small equipment footprint, simple process, and low energy consumption

Active Publication Date: 2015-03-25
CENT SOUTH UNIV
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  • Abstract
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  • Method for purifying smelting waste acid

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Embodiment 1

[0028] Embodiment 1: configuration sulfuric acid mass fraction is 5.0%, zinc ion concentration 90mg / L, lead ion concentration 10mg / L, antimony ion concentration 15mg / L, chloride ion concentration 9000mg / L, the mock dirty acid of fluoride ion concentration 3000mg / L solution. In the simulated sewage acid, the molar ratio is Al: (F - +Cl - ) = 1:3 by adding anhydrous aluminum sulfate, stirring to dissolve completely, and then filtering to remove insoluble impurities. Inject 1L of simulated dirty acid and tap water into the head tank respectively. The anion exchange membrane used in the diffusion dialysis device is the DF120 anion exchange membrane produced by a certain company, with a membrane area of ​​1.93m 2 . The inlet flow rate of dirty acid is 0.4L / h, and the flow rate of receiving liquid is 0.4L / h. After dynamic dialysis, the acid concentration in the regenerated acid was 1.18mol / L, the acid recovery rate was 93%, and the heavy metal (Pb, Zn, Sb) rejection rates were ...

Embodiment 2

[0029] Embodiment 2: the polluted acid used in the experiment is the polluted acid produced in the acid production system of the zinc concentrate fluidized furnace roasting flue gas of a certain smelter, the acid mass fraction (in sulfuric acid) 4.6%, the zinc ion concentration 78.4mg / L, the lead ion concentration 1.89mg / L, arsenic concentration 2.04mg / L, cadmium concentration 0.46mg / L, chloride ion concentration 9126.4mg / L, fluoride ion concentration 3152.3mg / L. Measure 1L of dirty acid and put it in a beaker, the molar ratio is Al: (F - +Cl -) = 1:2 ratio of adding anhydrous aluminum sulfate, stirring with a glass rod until completely dissolved. Sludge acid is removed by vacuum filtration device to remove solid particles. Inject 1L of dirty acid and tap water into the head tank respectively. The diffusion dialysis device uses DF120 anion exchange membrane with a membrane area of ​​1.93m 2 . The inlet flow rate of dirty acid is 0.9L / h, and the flow rate of receiving liqu...

Embodiment 3

[0030] Embodiment 3: the polluted acid used in the experiment is the polluted acid produced in a lead smelting plant utilizing the lead concentrate sintering process to produce flue gas acid production system, acid mass fraction (in sulfuric acid) 5.3%, zinc ion concentration 70.1mg / L, The lead ion concentration is 30.13mg / L, the arsenic concentration is 2.17mg / L, the cadmium concentration is 0.51mg / L, the chloride ion concentration is 10126.4mg / L, and the fluoride ion concentration is 2983.3mg / L. Measure 1L of dirty acid and place it in a beaker, the molar ratio is Fe: (F - +Cl - ) = 1:3 by adding anhydrous ferric sulfate, stirring with a glass rod until completely dissolved. Sludge acid is removed by vacuum filtration device to remove solid particles. Then inject 1L of dirty acid and tap water into the two elevated tanks respectively. The anion exchange membrane used in the diffusion dialysis device is the DF120 anion exchange membrane produced by a certain company, with ...

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Abstract

The invention discloses a method for purifying smelting waste acid. The method comprises the following steps: adding a coordination agent into a centralized inflow adjusting pool of waste acid discharged from a sulfuric acid smelting system, stirring uniformly, and filtering the mixture in a filter to further remove insoluble granular impurities; separating dilute acid nearly containing no metal ion and low-acid wastewater through a diffusion dialyzer; adsorbing such residual anion impurities as fluorine and chlorine in the dilute acid through ion exchange resin, concentrating the dilute acid in a multi-effect evaporator and recycling the dilute acid in the sulfuric acid system; further treating the low-acid wastewater to reach the national sewage drainage standard. The method disclosed by the invention can be used for quickly and efficiently separating acid from heavy metal ions in the smelting waste acid, the separated dilute acid can be recycled in a sulfuric acid production procedure after being concentrated, and the method has the advantages of low energy consumption and few residues, and can be used for effectively and comprehensively recycling resources in the waste acid. The wastewater treatment cost is low, and the economic benefit is good. The process is simple, the occupation area of equipment is small and industrialized application is easy to achieve.

Description

technical field [0001] The invention relates to a method for purifying smelting dirty acid, which belongs to the field of metallurgy, chemical industry and environmental protection. In particular, it relates to a method for purifying sulfuric acid in waste acid produced in an acid production system of a recycling smelter. Background technique [0002] With the rapid development of my country's national economy, my country's smelting industry has also caused serious pollution to the environment while making great contributions to economic construction. In particular, the discharge of smelting sewage seriously threatens the ecological environment and drinking water resources around the smelter. Because heavy metal pollution has the characteristics of great harm to human body, long duration and non-degradability, the Ministry of Environmental Protection of my country and other departments compiled the "Twelfth Five-Year Plan for Comprehensive Prevention and Control of Heavy Me...

Claims

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Application Information

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IPC IPC(8): C01B17/90
CPCC01B17/90
Inventor 刘久清吴秀锋
Owner CENT SOUTH UNIV
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