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Non-ferrous smelting waste acid purification treatment method

A purification treatment, non-ferrous metal technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem that gypsum slag storage occupies a large amount of land resources and is difficult to stabilize Disadvantages such as standard discharge and high concentration of calcium ions in the effluent achieve the effect of reducing the possibility of scaling, stable treatment effect and short process flow

Inactive Publication Date: 2015-04-01
CINF ENG CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this stage, various methods such as lime-gypsum method, chemical precipitation method, lime-iron salt method, vulcanization method, and membrane method are mainly used for combined treatment. The treatment process has high treatment costs, difficulty in stably meeting the discharge standards, and high calcium ion concentration in the effluent. It is difficult to reuse , Landfilling of gypsum slag occupies a large amount of land resources, reverse osmosis membrane is easy to clog and many other shortcomings, it is difficult to meet the requirements of the new national environmental protection policy

Method used

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  • Non-ferrous smelting waste acid purification treatment method
  • Non-ferrous smelting waste acid purification treatment method
  • Non-ferrous smelting waste acid purification treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The polluted acid used in this example comes from Plant A and Plant B. However, the acidity of the polluted acid in the two plants differs greatly, and the F content is lower than the standard level. Therefore, the acidity and F content were adjusted first.

[0021] (1) Acid adjustment and middle immersion

[0022] ①Mix the polluted acid from Plant A and Plant B at a volume ratio of 2:1 to make the acidity of the treated polluted acid more typical, then add 60mL of concentrated sulfuric acid until the acidity of the solution is 43g / L, and at the same time add 8.8 g NaF, so that the F content is more in line with the F content of typical polluted acid; see the following table for the content of each component after mixing:

[0023]

[0024] ② Add 100g of white soot and leach for 1 hour at a temperature of 70-80°C. Keep the temperature stable and then gradually add ZnO to adjust the acidity of the solution to a pH value of 2.5-3.0. When the pH value does not change, st...

Embodiment 2

[0050] This embodiment is to investigate the situation of using the liquid after electrowinning and impurity removal in Embodiment 1 to continue the swirling electrowinning and electrowinning zinc.

[0051] The content of zinc in the solution after electrodeposition and impurity removal is low, and zinc sulfate is added to prepare zinc sulfate solutions with zinc content of 50g / L and 100g / L respectively.

[0052]Clean the equipment with clean water, then inject 3L of zinc sulfate solution into the electrolyte storage tank, start the magnetic pump, and circulate the solution for 5 minutes; the swirl electrodeposition parameter takes the solution circulation volume of 600L / hr, and sets the current density for the electrodeposition experiment . During the test, the voltage was recorded at intervals during electrolysis, and the average cell voltage was calculated; the acidity of each time period was analyzed, and the records of the entire experiment process are shown in Table 1: ...

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Abstract

The invention relates to a non-ferrous smelting waste acid purification treatment method which comprises the following steps: (1) adding waste acid into concentrated sulfuric acid, adjusting the acidity to 40-50g / L, adding white ash, extracting at 70-80 DEG C, then, adding zinc oxide to enable the pH to 2.5-3.0, reacting under stirring and filtering; (2) removing chlorine from the filtrate by chloride ion exchange resin and removing fluorine from the filtrate by fluorine ion exchange resin respectively; and (3) respectively carrying out spiral electrodeposition on the liquid after ion exchange to remove arsenic and carrying out spiral electrodeposition to recover zinc. Waste acid treated reaches zero discharge, arsenic in the waste acid can be separated and heavy metal zinc can be recovered, so that the piling problem of waste gypsum residues generated in conventional sewage treatment is solved, thereby achieving zero discharge and comprehensive recovery and utilization of sewage and solid wastes of a lead, zinc and copper joint smelting enterprise.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a sewage acid purification treatment method. Background technique [0002] Sludge acid is the waste acid produced by washing flue gas during the process of smelting flue gas to sulfuric acid. After the purification section of the sulfuric acid workshop of the nonferrous metal smelter washes and purifies the smelting flue gas, impurities such as arsenic, fluorine, chlorine, and dust in the flue gas enter the circulating acid, and when the impurities are enriched to a certain extent, a certain amount is discharged out of the system of dirty acid. The polluted acid produced by non-ferrous metallurgy has high acidity, many types and high concentrations of heavy metals, and contains a large amount of arsenic, fluorine, and chlorine that are difficult to remove. At this stage, various methods such as lime-gypsum method, chemical precipitation method, lime-iron sal...

Claims

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Application Information

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IPC IPC(8): C02F9/06C25C1/16
CPCY02P10/20
Inventor 李绪忠肖功明虢振强王水云高伟卢丽赵凌波陈林吴班陈寒秋邓涛门海芬张弘强贺迎春夏传
Owner CINF ENG CO LTD
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