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Method for treating waste water containing vanadium and chromium

A chromium wastewater, chromium ion technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of strong temperature resistance and strong adsorption capacity

Active Publication Date: 2015-04-29
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The supernatant of vanadium precipitation is treated by reduction, neutralization of chromium precipitation, filtration, and treatment. This process not only brings back ammonia nitrogen wastewater, but also cannot realize the resource utilization of chromium

Method used

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  • Method for treating waste water containing vanadium and chromium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Get 1L of vanadium-extracting wastewater from a certain iron and steel enterprise in Chengde, and process it as follows:

[0029] 1) Adsorption: Use strong base anion exchange resin D201 to adsorb vanadium and chromium ions in wastewater to obtain a strong base anion exchange resin containing vanadium and chromium ions;

[0030] 2) Analysis: At 20°C, add 3mol / L NaOH aqueous solution to the strong base anion exchange resin containing vanadium and chromium ions obtained in step 1) for analysis to obtain an analysis solution. After analysis, the adsorption medium can be reused;

[0031] 3) Precipitation of vanadium: Add alkaline substances to the analysis solution, the alkaline substance is calcium hydroxide slurry, the amount added is the amount of vanadium element substances in the analysis solution: the amount of calcium element substances in the alkaline substances = 0.8:1 , stirring and reacting, the temperature is 80°C, the reaction time is 1h, and after being unifor...

Embodiment 2

[0041] Get the vanadium extraction tail liquid 2L of a certain iron and steel enterprise in Chengde, process as follows:

[0042] 1) Adsorption: Use a strong base anion exchange resin to adsorb vanadium and chromium ions in wastewater to obtain a strong base anion exchange resin containing vanadium and chromium ions;

[0043] 2) Analysis: Add 5 mol / L NaOH aqueous solution to the strong base anion exchange resin containing vanadium and chromium ions obtained in step 1) at 40°C to obtain an analysis solution, and the adsorption medium can be reused after analysis;

[0044] 3) Precipitation of vanadium: Add alkaline substance to the analysis solution, the alkaline substance is calcium hydroxide powder, the amount added is the amount of vanadium element substance in the analysis solution: the amount of calcium element substance in the alkaline substance = 1:1, Stir the reaction, the temperature is 90°C, the reaction time is 2h, and filter after uniformity to obtain the calcium van...

Embodiment 3

[0054] Get the vanadium extraction tail liquid 2L of a certain iron and steel enterprise in Chengde, process as follows:

[0055] 1) Adsorption: Use strong base anion exchange fibers to adsorb vanadium and chromium ions in wastewater to obtain anion exchange fibers containing vanadium and chromium ions. The anion exchange fibers are polypropylene grafted with styrene and then grafted with quaternary amino groups the product obtained;

[0056] 2) Analysis: Add 4mol / L NaOH aqueous solution to the strong base anion exchange resin containing vanadium and chromium ions obtained in step 1) at 80°C to obtain an analysis solution, and the adsorption medium can be reused after analysis;

[0057] 3) Precipitation of vanadium: Add an alkaline substance to the analysis solution, the alkaline substance is calcium oxide, and the amount added is the amount of vanadium element substance in the analysis solution: the amount of calcium element substance in the alkaline substance = 1.1:1, and th...

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Abstract

The invention relates to a method for treating waste water containing vanadium and chromium. The method comprises the following steps of: (1) adsorption: adopting an adsorbing medium to adsorb vanadium and chromium ions in the waste water containing vanadium and chromium; (2) desorption: adding a desorption agent into the adsorbing medium containing vanadium and chromium ions obtained in the step (1) to carry out desorption; (3) vanadium precipitation: adding alkaline substances into desorption solution, stirring to be uniform, and then filtering to obtain a calcium-vanadate product and vanadium-precipitated supernant; (4) chromium crystallization: carrying out evaporating concentration and cooling crystallization on the vanadium-precipitated supernant to obtain a sodium-chromate crude product and crystallizing mother liquor; (5) recrystallization: heating and dissolving the sodium-chromate crude product, and carrying out cooling crystallization to obtain a sodium-chromate product and cooling-crystallizing mother liquor; and (6) returning of the crystallizing mother liquor: returning the crystallizing mother liquor to the step (2) as the ingredient of the analysis solution to be repeatedly utilized. The method has the advantages that the recovery rate for the vanadium and chromium elements in the waste water reaches 99.9% or higher, simultaneously high-purity calcium vanadate and sodium chromate are obtained, and no waste water and waste residue are generated in the whole process.

Description

technical field [0001] The invention relates to a method for treating industrial waste water, in particular to a method for treating waste water containing vanadium and chromium. Background technique [0002] Vanadium and chromium wastewater is industrial wastewater produced during the production of vanadium oxides by vanadium slag through sodium roasting-leaching and filtering-acid ammonium salt precipitation and other processes. The content of pentavalent vanadium is about 50ppm-100ppm, and the content of hexavalent chromium is even higher Between 500ppm-1000ppm, far exceeding the national emission standards. High-priced vanadium and chromium compounds, as heavy pollutants, will cause great pollution to water bodies and soil environments if they are discharged or leaked, causing serious damage to crops, seriously endangering human health, and causing waste of metal resources. [0003] At present, the more effective methods for treating this kind of wastewater are: (1) red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01G31/00C01G37/14
Inventor 陈东辉祁健高明磊石立新
Owner HEBEI IRON AND STEEL
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