Treatment method of sodium-roasted-leached-acid ammonium salt vanadium precipitation waste water

A technology of acidic ammonium salt vanadium precipitation and sodium roasting, which is applied in the direction of heating water/sewage treatment, etc., and can solve the problem of high treatment cost

Active Publication Date: 2012-06-20
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method needs to continuously blow air and add alkali to adjust pH, the processing cost is relatively high

Method used

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  • Treatment method of sodium-roasted-leached-acid ammonium salt vanadium precipitation waste water
  • Treatment method of sodium-roasted-leached-acid ammonium salt vanadium precipitation waste water
  • Treatment method of sodium-roasted-leached-acid ammonium salt vanadium precipitation waste water

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] Get the sodium salt method waste water 1000L (pH is 8~9.5) after removing the vanadium chromium through filtering, be that its pH=5.6 is adjusted with the industrial sulfuric acid of 50% concentration, with the processing speed of 10L / h on the test device according to the present invention processing method.

[0038] The main parameters are:

[0039] Normal pressure, sodium sulfate crystal evaporation and crystallization temperature of 103-107°C, stirring speed of 380rpm, concentration ratio of 9.2:1, crystallization time of 1 hour, heat preservation and suction filtration temperature of 92°C, to obtain anhydrous sodium sulfate and ammonium-enriched liquid.

[0040] Cool the ammonium-enriched solution to 13°C, and after 4.5 hours of natural crystallization at constant temperature, perform suction filtration to obtain double salt residue and refined solution. The double salt slag is directly redissolved in the initial wastewater storage device.

[0041] The refined sol...

example 2

[0053] Get 2000L of sodium salt process acidic wastewater and filter it, adjust its pH=6.2 with a 30% caustic soda aqueous solution, and treat it according to the treatment method of the present invention with a treatment speed of 15L / h on the test device.

[0054] The main parameters are:

[0055] Negative pressure, sodium sulfate crystal evaporation crystallization temperature 95 ~ 100 ℃, stirring speed 380rpm, concentration ratio 9.2:1. The crystallization time is 1 hour, and the heat preservation and suction filtration temperature is 93° C. to obtain anhydrous sodium sulfate and ammonium-enriched liquid.

[0056] Cool the ammonium-enriched solution to 11°C, and after natural crystallization at constant temperature for 4.5 hours, perform suction filtration to obtain double salt residue and refined solution. The double salt slag is directly redissolved in the initial wastewater storage device.

[0057] The refined solution was evaporated and concentrated in vacuo, the evap...

example 3

[0069] Get the sodium salt method waste water 1000L (pH is 7.8~9) after removing the vanadium chromium through filtering, be that its pH=5.1 is adjusted by the industrial sulfuric acid of 40% with concentration, the processing speed of 10L / h is according to according to the method of the present invention processing method.

[0070] The main parameters are:

[0071] At normal pressure, the sodium sulfate crystal evaporation crystallization temperature is 91-97°C, the stirring speed is 380rpm, the concentration ratio is 8.5:1, the crystallization time is 50 minutes, and the heat preservation and suction filtration temperature is 90°C to obtain anhydrous sodium sulfate and ammonium-enriched liquid.

[0072] Cool the ammonium-enriched liquid to 9°C, and after natural crystallization at constant temperature for 3 hours, perform suction filtration to obtain double salt residue and refined liquid. The double salt slag is directly redissolved in the initial wastewater storage device...

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Abstract

The invention provides a treatment method of sodium-roasted-leached-acid ammonium salt vanadium precipitation waste water. The method comprises the following steps of: (a) concentrating and crystalizing waste water of which the pH value is 5.0-6.5 at the temperature of over 90 DEG C to obtain first magma, and performing solid-liquid separation at the temperature of not lower than 90 DEG C to obtain an anhydrous sodium sulfate crystal and a first solution; (b) crystalizing the first solution at the temperature of 9-20 DEG C, and performing solid-liquid separation to obtain a complex salt of sodium sulfate and ammonia sulfate; and (c) evaporating and concentrating the second solution at the temperature of over 70 DEG C, crystalizing at the temperature of 60-65 DEG C to obtain second magma, and performing solid-liquid separation on the second magma at the temperature of over 55 DEG C to obtain a mixed ammonia salt containing ammonia sulfate and ammonium chloride, and a third solution.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a sodium roasting-leaching-acid ammonium salt precipitation vanadium wastewater treatment method. Background technique [0002] At present, there are two main production processes of vanadium oxide in the world. The raw materials include vanadium slag obtained from vanadium-containing minerals, vanadium-containing stone coal, spent catalysts, and petroleum cinders. One process is calcification roasting-acid leaching-hydrolysis vanadium precipitation (lime method for short). Another process is sodium roasting-leaching-ammonium salt precipitation vanadium (sodium salt method for short), the vanadium products produced by this process are of high quality and stable production. [0003] Sodium salt method wastewater is a kind of high ammonia nitrogen, high V (V) or high V (V) and Cr (VI) Acidic inorganic wastewater, which also contains high concentrations of sulfates and chlorides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/02
Inventor 刘昌林李千文张景垒洪俊辉董智张金阳黎建明蒲德利
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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