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Resource treatment method for smelting flue gas washing wastewater

A technology of smelting flue gas and recycling, which is applied in the direction of gaseous effluent wastewater treatment, chemical instruments and methods, and multi-stage water treatment. It can solve the problems of inconvenient separation and recovery of arsenic, avoid secondary pollution, and simplify the process. Effect

Active Publication Date: 2020-06-19
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since As at room temperature 2 o 3 The solubility in water is only 20g / L, and As 2 o 3 The solubility in acidic solution is still smaller, and the arsenic-containing solution obtained by acid hydrolysis of calcium arsenite is a low-concentration acidic arsenic-containing solution, which brings great inconvenience to the separation and recovery of arsenic

Method used

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  • Resource treatment method for smelting flue gas washing wastewater
  • Resource treatment method for smelting flue gas washing wastewater
  • Resource treatment method for smelting flue gas washing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Take 2.5m of smelting flue gas washing wastewater 3 , stirring to add calcium iodide, the I - The ion concentration is increased to 0.006mg / L, and the residual H in the wastewater is used 2 SO 3 As reducing agent, in I - Under the catalysis of ions, reduce As(V) to As(III), react at room temperature for 15 minutes, then add negative 150 mesh limestone powder, adjust the pH of the solution to 2.3, and filter to obtain calcium sulfate filter cake containing 0.02% As and Reduction and neutralization liquid; the obtained reduction and neutralization liquid is added with titanium, zirconium and silicon containing 2.3% of Ti, 5.6% of Zr, 21.8% of Si and 13.6% of Al according to the mass ratio of the fluorine contained in it to the defluorinating agent of 1:50. , aluminum oxide and its hydrate, adjust the pH of the solution to 3.5, stir at 20°C for 0.5h, filter the defluorinated liquid and the loaded defluorinated agent, and regenerate the loaded defluorinated agent with so...

Embodiment 2

[0043] Take 5m of smelting flue gas washing wastewater 3 , into SO 2 To saturation, stir at room temperature for 24 hours to reduce As(V) to As(III), then add negative 180-mesh limestone powder to adjust the pH of the solution to 2.7, filter to obtain a calcium sulfate filter cake containing 0.03% As and reducing medium And after the liquid; the obtained reduction and neutralization liquid is added with Ti 6.8%, Zr1.3%, Ca 0.8%, Si 19.6%, Al 12.8% titanium, A defluorinating agent composed of oxides of zirconium, calcium, silicon, aluminum and their hydrates, adjust the pH of the solution to 3.9, stir at 25°C for 1 hour, filter to obtain the defluorinated liquid and the loaded defluorinating agent, and use sodium carbonate for the loaded defluorinating agent After the solution is regenerated, it is returned to recycling, and sodium carbonate is added to the desorbed solution, and NaF is crystallized by the same ion effect; the defluorinated solution is adsorbed by D231 strong ...

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Abstract

The invention discloses a resource treatment method for smelting flue gas washing wastewater. According to the method, smelting flue gas washing wastewater is subjected to resourceful treatment through the steps of reduction neutralization deacidification, step-by-step adsorption defluorination and dechlorination, neutralization purification and impurity removal and the like; the sulfuric acid inthe wastewater is neutralized with lime to obtain calcium sulfate containing less than 0.1% of As; the fluorine and the chlorine in the wastewater are separated and recovered in the form of sodium fluoride and sodium chloride solids respectively after adsorbing and enriching, the arsenic in the purification slag is recovered in the form of metallic arsenic or arsenious acid, and the valuable metals in the wastewater are enriched in the neutralization purification slag to facilitate comprehensive recovery; and the neutralized and purified liquid returns to smelting flue gas washing so as to berecycled. The method provided by the invention has the advantages of good treatment effect, high comprehensive utilization rate, zero wastewater discharge, no secondary pollution and the like, and issuitable for industrial application of smelting flue gas washing wastewater treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a resource treatment method for smelting flue gas washing wastewater. Background technique [0002] The flue gas produced by smelting copper, lead, zinc, etc. needs to be sprayed, washed, dust-removed and purified before acid production, and the waste water generated during the washing process contains H 2 SO 4 In addition, it also contains valuable metals such as Cu, Fe, Pb, Zn, and Cd, and harmful elements such as As, F, and Cl, among which As includes both As(III) and As(V). At present, smelting flue gas washing wastewater is generally treated by sulfide-lime neutralization method. The so-called sulfidation is to add sodium sulfide or sodium hydrosulfide to the acidic waste water for washing smelting flue gas, so that heavy metals such as copper and arsenic in it are precipitated in the form of sulfide, and the liquid and solid are separated to obtain arse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F103/18
CPCC02F1/001C02F1/42C02F1/583C02F1/66C02F1/70C02F9/00C02F2001/007C02F2101/103C02F2103/18C02F2301/08
Inventor 王学文孟钰麒王懿王明玉
Owner CENT SOUTH UNIV
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