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Method for recycling acidic vanadium deposit wastewater

A vanadium-precipitating wastewater and acidic technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as blocked pipes and washing water outlets

Active Publication Date: 2014-05-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above method, to provide a method for recycling acidic vanadium-precipitated wastewater, which effectively controls the concentration of calcium ions in the solution returned to the leaching process, and avoids the process of recycling acidic vanadium-precipitated wastewater Calcium sulfate is produced in the water to block the pipeline and the washing water outlet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 500mL acidic vanadium precipitation wastewater (containing Ca 2+ 0.486g / L, Mn 2+ 8.32g / L, Mg 2+ 1.49g / L), under the condition of stirring, adjust the pH value to 9 with milk of lime, and then carry out solid-liquid separation to obtain gypsum slag and 492mL alkaline solution (containing Ca 2+ 0.772g / L, Mn 2+ 0.75g / L, Mg 2+ 0.51g / L); add 1.70g of ammonium carbonate to the obtained alkaline solution, stir for 10min, let it stand, filter off the decalcification residue, and obtain the supernatant (Ca 2+ 0.144g / L, Mn 2+ 0.08g / L, Mg 2+ 0.46g / L); use sulfuric acid to adjust the pH value of the supernatant to 3.2, and let it stand still, no precipitation is found, and finally return the supernatant to the leaching process for recycling.

Embodiment 2

[0024] 500mL acidic vanadium precipitation wastewater (containing Ca 2+ 0.486g / L, Mn 2+ 8.32g / L, Mg 2+ 1.49g / L), under the condition of stirring, adjust the pH value to 10 with milk of lime, and then carry out solid-liquid separation to obtain gypsum slag and 495mL alkaline solution (containing Ca 2+ 0.847g / L, Mn 2+ 0.38g / L, Mg 2+ 0.34g / L); add 1.20g ammonium bicarbonate to the obtained alkaline solution, stir for 10min, let it stand, filter off the decalcification residue, and obtain the supernatant (Ca 2+ 0.152g / L, Mn 2+ 0.08g / L, Mg 2+ 0.31g / L); use sulfuric acid to adjust the pH value of the supernatant to 4.5, and let it stand still, no precipitation is found, and finally return the supernatant to the leaching process for recycling.

Embodiment 3

[0026] 500mL acidic vanadium precipitation wastewater (containing Ca 2+ 0.486g / L, Mn 2+ 8.32g / L, Mg 2+ 1.49g / L), adjust the pH value to 11 with milk of lime under stirring conditions, and then carry out solid-liquid separation to obtain gypsum slag and 495mL alkaline solution (containing Ca 2+ 0.847g / L, Mn 2+ 0.38g / L, Mg 2+ 0.34g / L); add 1.00g oxalic acid to the obtained alkaline solution, stir for 10min, let it stand, filter off the decalcification residue, and obtain the supernatant (Ca 2+ 0.092g / L, Mn 2+ 0.37g / L, Mg 2+ 0.30g / L); use sulfuric acid to adjust the pH value of the supernatant to 6, and let it stand still, no precipitation is found, and finally return the supernatant to the leaching process for recycling.

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Abstract

The invention provides a method for recycling acidic vanadium deposit wastewater. The method comprises the following steps: adjusting the acidic vanadium deposit wastewater to be alkaline by lime milk, then carrying out solid-liquid separation to obtain an alkaline solution and a gypsum residue; adding a decalcifying agent into the alkaline solution for decalcifying, then carrying out solid-liquid separation to obtain a supernatant liquor and a decalcified residue; and adjusting the pH of the supernatant liquor to be 3-7 by sulfuric acid, then returning the supernatant liquor to the leaching step for recycling. Due to the adoption of the method for recycling the acidic vanadium deposit wastewater, concentration of calcium ions in the solution returned to the leaching step can be effectively controlled, calcium sulfate deposit is prevented from being formed, a pipeline and a water outlet are prevented from being blocked due to calcium sulfate scale, and the production equipment is guaranteed to run normally.

Description

technical field [0001] The invention relates to a treatment method for vanadium-precipitation wastewater, in particular to a treatment method for recycling acidic vanadium-precipitation wastewater. Background technique [0002] At present, there are two main treatment methods for the vanadium precipitation wastewater generated by the production of vanadium oxide from vanadium slag in industry: [0003] One is based on vanadium slag sodium roasting-water leaching vanadium extraction as the main process. The wastewater produced by this process is generally used to reduce vanadium-chromium-neutralization, filtration-evaporation and concentration. This technology is relatively mature but the cost of wastewater treatment is high; [0004] The other is the main process of vanadium slag calcification roasting-acid leaching vanadium extraction. The vanadium precipitation wastewater produced by this process is currently neutralized with lime, filtered-adjusting pH, and then returned ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 付自碧何文艺申彪卢晓林高官金彭毅张林彭一村
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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