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Method for removing manganese from acidic molybdenum precipitation wastewater

A vanadium-precipitated wastewater and acidic technology, applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems that sediment and wastewater can no longer be effectively used, cannot be further separated, and cannot be directly applied. Achieve good social and economic benefits, low equipment requirements, and easy operation

Inactive Publication Date: 2014-07-16
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

[0004] At present, one of the commonly used treatment methods for the above-mentioned vanadium precipitation wastewater is the method of lime neutralization, but this method will precipitate all the metal ions in it, and there are a large amount of calcium sulfate and manganese hydroxide together in the generated precipitate , can not be further separated and can not be directly applied, so manganese cannot be simply removed, and the obtained sediment and wastewater can no longer be effectively used, so it is necessary to provide a new method for manganese removal of acidic vanadium precipitation wastewater

Method used

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  • Method for removing manganese from acidic molybdenum precipitation wastewater

Examples

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example 1

[0037]Add 1000mL of acidic vanadium-precipitation wastewater with the components listed in Table 1 to a 2000mL clean beaker, stir and keep the temperature of the acidic vanadium-precipitation wastewater at 25°C, use calcium oxide to adjust the pH of the acidic vanadium-precipitation wastewater to 5.0, and then add 0.24 mol of ammonium oxalate was reacted for 30 minutes, cooled and settled for 30 minutes, and filtered to obtain manganese oxalate precipitate and supernatant. After testing, the manganese ion in the obtained supernatant was less than 0.05g / L. Heat and concentrate the obtained supernatant at 90°C so that the concentration of ammonium sulfate in the concentrated supernatant is greater than 300g / L, then cool and crystallize at 0°C to obtain ammonium sulfate, and the obtained condensed water can be directly used for calcification of vanadium slag Leaching of roasted clinker.

example 2

[0039] Add 1000mL of acidic vanadium precipitation wastewater with the components listed in Table 1 to a 2000mL clean beaker, stir and keep the temperature of the acidic vanadium precipitation wastewater at 60°C, use ammonium carbonate to adjust the pH value of the acidic vanadium precipitation wastewater to 7.0, and then add 0.36 mol of ammonium oxalate was reacted for 120 minutes, cooled and settled for 60 minutes, and filtered to obtain manganese oxalate precipitate and supernatant. After testing, the manganese ion in the obtained supernatant was less than 0.05g / L. Heat and concentrate the obtained supernatant at 100°C so that the concentration of ammonium sulfate in the concentrated supernatant is greater than 300g / L, then cool and crystallize at 10°C to obtain ammonium sulfate, and the obtained condensed water can be directly used for calcification of vanadium slag Leaching of roasted clinker.

example 3

[0041] In the 2000mL clean beaker, add 1000mL acidic vanadium precipitation wastewater with the composition listed in Table 1, stir and keep the temperature of the acidic vanadium precipitation wastewater at 50°C, use calcium hydroxide to adjust the pH value of the acidic vanadium precipitation wastewater to 6.0, and then Add 0.30 mol of ammonium oxalate, react for 100 minutes, cool and settle for 40 minutes, and filter to obtain manganese oxalate precipitate and supernatant. After testing, the manganese ion in the obtained supernatant was less than 0.05g / L. Heat and concentrate the obtained supernatant at 95°C so that the ammonium sulfate concentration in the concentrated supernatant is greater than 300g / L, then cool and crystallize at 5°C to obtain ammonium sulfate, and the obtained condensed water can be directly used for vanadium slag calcification Leaching of roasted clinker.

[0042] In summary, the present invention uses chemical methods to remove manganese from acidic...

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Abstract

The invention discloses a method for removing manganese from acidic molybdenum precipitation wastewater. The method comprises the steps of adjusting the pH value of the acidic molybdenum precipitation wastewater to be 5-7, adding ammonium oxalate, and filtering to obtain ammonium oxalate deposits and supernatant liquor, wherein the supernatant liquor contains less than 0.05g / L of Mn<2+>. The method has the advantages of being simple in process, easy and convenient to operate, capable of recovering manganese resources, low in equipment requirement, environment-friendly and the like, and has very good social and economic benefits. In addition, ammonium sulfate obtained after manganese removal can be used for molybdenum precipitation, condensed water can be directly recycled, and the resources can be effectively utilized.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, and more specifically relates to a method for removing manganese from acidic vanadium-precipitated wastewater obtained by leaching vanadium-precipitated wastewater after calcification and roasting. Background technique [0002] The current methods for extracting vanadium from vanadium-containing minerals mainly include sodium roasting vanadium extraction method and calcification roasting vanadium extraction method. [0003] Among them, in calcification roasting, sulfuric acid is usually used to leach the clinker to obtain an acidic vanadium-containing leaching solution. Since the acidic vanadium-containing leaching solution contains a large amount of manganese, ammonium salts are used to precipitate vanadium in the acidic vanadium-containing leaching solution. The wastewater contains a large amount of divalent manganese ions dissociated in the vanadium precipitation wastewater, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/64C22B7/00C02F103/16C22B47/00
CPCY02P10/20
Inventor 殷兆迁游本银吴刘柱高官金孟伟巍
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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