Method for reduction, evaporation and concentration treatment of wastewater produced by acidic precipitation of vanadate-leaching solution

A technology of vanadium precipitation and evaporative concentration of acid ammonium salts, which is applied in the fields of reduced water/sewage treatment, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc. efficiency, affecting the stable operation of production, etc., to achieve the effect of high separation efficiency, low cost and high resource utilization

Inactive Publication Date: 2016-07-13
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Abstract
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Problems solved by technology

Specifically: ① Although the wastewater entering the reduction neutralization and evaporation concentration system has been settled, the fine particles of APV in it have not settled completely; ② The temperature for wastewater reduction and neutralization is 40°C to 60°C, and the reaction temperature is relatively low
The above two problems lead to: the liquid-solid heterogeneous reaction between the APV of solid particles and the reducing agent solution in the liquid system is difficult to achieve equilibrium, and the reduction reaction is not complete; The evaporative concentration system heats up and concentrates, the unreduced high-valent vanadium-chromium continues to undergo reduction reaction with the reducing agent, and the low-valent vanadium-chromium precipitate acts as a heterogeneous nucleation seed crystal to induce the precipitation of sulfate, calcium, sodium and other ions in the solution, and the precipitated mixture Attached to the tube wall of the heat exchanger, resulting in low heat exchange efficiency, and often block the heat exchange tubes of the heat exchanger (currently, the cost of cleaning the tubes is 1 million to 1.5 million yuan / year), seriously affecting the stable operation of production and Increase the cost of wastewater treatment and reduce the overall benefit of the product

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  • Method for reduction, evaporation and concentration treatment of wastewater produced by acidic precipitation of vanadate-leaching solution

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Embodiment 1

[0039] Load 20 tons of vanadium extraction residue into 10 suction filtration tanks, the thickness of the residue layer is 500mm-800mm, and the continuous suction filtration is 100m 3 Acidic ammonium salt precipitation vanadium wastewater, in the obtained filtrate [Cr 6+ ]=2.0g / L~2.5g / L, [V 5+]=0.29g / L~0.40g / L, according to 6~7kg sodium metabisulfite / m 3 Add sodium metabisulfite to the proportion of waste water to carry out reduction reaction under stirring conditions, add 0.8‰~1‰ of activated carbon and cellulose (the mass ratio of activated carbon and cellulose is 1~5:1) composite sedimentation agent, add 30% of Liquid caustic soda adjusts the pH value of the solution to 7-8, and the vanadium-chromium compound is precipitated. The vanadium-chromium compound slurry is filtered through a plate and frame filter press to achieve solid-liquid separation, and the filtrate enters the four-effect evaporation concentration system for heating and concentration. When it reaches 35% t...

Embodiment 2

[0041] Load 24 tons of vanadium extraction residue into 12 suction filtration tanks, the thickness of the residue layer is 500mm-800mm, and the continuous suction filtration is 100m 3 Acidic ammonium salt precipitation vanadium wastewater, in the obtained filtrate [Cr 6+ ]=1.8g / L~2.7g / L, [V 5+ ]=0.25g / L~0.45g / L, according to 5~8kg sodium metabisulfite / m 3 Add sodium sulfite to the proportion of waste water to carry out the reduction reaction under stirring conditions, add 1.0‰~1.5‰ of activated carbon and cellulose composite sedimentation agent (mass ratio of activated carbon and cellulose is 1~5:1), add 30% liquid Alkali adjusts the pH value of the solution to 7-8, and the vanadium-chromium compound is precipitated. The vanadium-chromium compound slurry is filtered through a plate and frame filter press to achieve solid-liquid separation, and the filtrate enters the four-effect evaporation concentration system for heating and concentration. At 35% to 40%, the discharge syst...

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Abstract

The invention relates to a method for reduction, evaporation and concentration treatment of wastewater produced by acidic precipitation of a vanadate-leaching solution and belongs to the fields of chemical engineering and metallurgy. The invention aims to solve the technical problem of providing the method for reduction, evaporation and concentration treatment of wastewater produced by acidic precipitation of the vanadate-leaching solution. The method comprises the following steps: a, performing sand filtration on the wastewater produced by acidic precipitation of the vanadate-leaching solution through residue obtained after extracting aluminum to obtain a filtrate A; b, adding a composite settling agent and a reducing agent into the filtrate A and regulating the pH value to be 7-8 and filter-pressing to obtain a filtrate B and a solid; evaporating and concentrating the filtrate B, cooling and crystallizing, and separating out sodium sulfate and ammonium sulfate. According to the method provided by the invention, the problems of scaling and blockage inside tubes of a heat exchanger in an evaporation and concentration system are effectively solved, the utilization ratio of heat energy is improved, the expense required for cleaning the tubes of the heat exchanger is reduced, and the production cost of vanadium products is reduced. The method provided by the invention has the advantages that the technological process is simple, the separation efficiency is high, the resource utilization rate is high, the cost is low, the wastewater treatment cost can be reduced, and the comprehensive benefits of the vanadium products are improved.

Description

technical field [0001] The invention relates to a method for reducing, evaporating and concentrating treatment of acidic ammonium salt vanadium precipitation wastewater, which belongs to the fields of chemical industry and metallurgy. Background technique [0002] At present, in the mainstream vanadium oxide production process, the ammonium polyvanadate (APV) intermediate product is produced by acidic ammonium salt vanadium precipitation method, and the ammonium polyvanadate (APV) is produced by heating and melting or reducing ammonium polyvanadate to produce vanadium oxide. The ammonium polyvanadate produced by the acidic ammonium salt vanadium precipitation process has low impurity content, stable product quality and high vanadium recovery rate, but at the same time produces a large amount of V(Ⅴ), Cr(Ⅵ), SO 4 2- 、Na + , NH 4 + and acidic wastewater with fine APV particles. V(Ⅴ) and Cr(Ⅵ) in wastewater are toxic and harmful ions, which cause serious damage to human he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01C1/24C01D5/00C02F101/20C02F101/16
CPCC01C1/24C01D5/00C02F1/001C02F1/048C02F1/5236C02F1/5263C02F1/56C02F1/66C02F1/70C02F9/00C02F2101/16C02F2101/20C02F2303/14Y02P20/10
Inventor 万龙飞彭一村李千文韦林森王英穆小玲冉俊晏杰甘信德
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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