Recycling method of acid ammonium salt precipitating vanadium waste water
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An acid ammonium salt precipitation vanadium and wastewater technology, applied in metallurgical wastewater treatment, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of underutilization of acid and ammonia and waste of resources.
Inactive Publication Date: 2016-04-27
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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The problem with this method is that the acid and ammonia in the w
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[0038] Example 1
[0039] Take 1000mL vanadium precipitation wastewater, of which Na + Content 20.65g / L, SO 4 2- Content 83.74g / L, NH 4 + The content is 9.58g / L, pH=2.5, add 670mL of sodium polyvanadate solution with vanadium concentration 60g / L, and mix well; adjust the pH of the solution to 5.2 with 30% sulfuric acid solution, at room temperature, stir and react for 1h, stand for 1h; filter; , Get 82.0g vanadium raw material, 1560ml waste water, the main component of waste water is Na + Content 31.85g / L, SO 4 2- Content 65.23g / L, NH 4 + The content is 2.46g / L, pH=5.2.
Example Embodiment
[0040] Example 2
[0041] Take 1000mL of vanadium precipitation wastewater, Na + Content 21.38g / L, SO 4 2- Content 85.67g / L, NH 4 + The content is 9.03g / L, pH=2.5, add 1000mL of sodium polyvanadate solution with vanadium concentration of 30g / L, and mix well; add 25% sulfuric acid solution to adjust the solution pH=5.4, at room temperature, stir for 1h and stand for 3h ; Filtration to obtain 60.05g vanadium raw material, 1920ml wastewater, and the main component of wastewater is Na + Content 27.5g / L, SO 4 2- Content 58.46g / L, NH 4 + The content is 3.02g / L.
Example Embodiment
[0042] Example 3
[0043] Take 1000mL of vanadium precipitation wastewater, Na + Content 22.37g / L, SO 4 2- Content 87.64g / L, NH 4 + The content is 8.87g / L, pH=2.5, add 750mL of sodium polyvanadate solution with vanadium concentration of 47g / L, and mix well; add 30% sulfuric acid solution to adjust the pH of the solution to 5.5, at room temperature, stir for 1h and let stand for 2h; Filtered to obtain 71.59g of vanadium raw material, 1650ml of wastewater, and the main component of wastewater is Na + Content 30.61g / L, SO 4 2- Content 62.62g / L, NH 4 + The content is about 2.45g / L.
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Abstract
The invention belongs to the field of chemical engineering and metallurgy, and particularly relates to a recycling method of acid ammonium salt precipitating vanadium waste water. The recycling method comprises the following steps that a, the acid ammonium salt precipitating vanadium waste water is added to and is uniformly mixed with a polyoxovanadium sodium solution to form a mixed solution; b, the pH value of the mixed solution is adjusted to 5-6, the mixed solution is subjected to standing crystallization and filtration, a vanadium-containing raw material and new waste water are obtained; c, a reducing agent is added to the new waste water for reduction, after the reduction, alkali is added for neutralization, pressure filtration is carried out, and pressure filtration water and vanadium and chromium residues are obtained; and d, the pressure filtration water is subjected to evaporation and concentration, crystals of sodium salt and ammonium salt and condensation water are obtained. According to the recycling method of the acid ammonium salt precipitating vanadium waste water, after alkaline polyoxovanadium solution is mixed with the acid ammonium salt precipitating vanadium waste water, the pH value is adjusted to 5-6, the solution is crystallized sufficiently, and parts of ammonium and acid in the waste water can be recycled.
Description
technical field [0001] The invention belongs to the fields of chemical industry and metallurgy, and relates to a method for reusing waste water, in particular to a method for reusing acid ammonium salt vanadium precipitation waste water. Background technique [0002] Except for the Tula plant in Russia, no matter what vanadium resources are used, the rest of the vanadium plants use sodium oxide roasting-water immersion-acid ammonium salt precipitation vanadium-vanadium oxide (V 2 o 5 and V 2 o 3 ) - Vanadium alloy process to produce vanadium products. Obviously, vanadium oxide is an essential intermediate process for the production of vanadium products, and every ton of V 2 o 5 or V 2 o 3 Discharge about 50~150m 3 The vanadium precipitation wastewater contains not only vanadium and chromium, but also a large amount of Na + , SO 4 2- , NH 4 + Plasma and a small amount of suspended solids. [0003] In the prior art, for example, the wastewater treatment process o...
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