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Method for preparing ammonium metavanadate from vanadium extraction leaching solution

A technology of ammonium metavanadate and leaching solution, which is applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., and can solve problems such as large ammonium consumption, entering products, and incomplete purification

Inactive Publication Date: 2010-06-23
PANGANG GRP PANZHIHUA STEEL & VANADIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple in process and easy to operate, but the waste liquid contains 1-2.5g / L of vanadium, consumes a lot of ammonium, and the composition of the leachate is complicated, and the purification is not complete, and it is easy for impurities to enter the product during the precipitation process, so the obtained partial The ammonium vanadate product has high impurity content, and it is impossible to obtain high-purity NH 4 VO 3 product

Method used

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  • Method for preparing ammonium metavanadate from vanadium extraction leaching solution
  • Method for preparing ammonium metavanadate from vanadium extraction leaching solution

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take 500mL of sodium roasting leaching solution (concentration of vanadium is 30.0g / L), adjust the pH value of the solution to 5.0 with concentrated sulfuric acid, heat the solution to 30°C, and 4 + : The mass ratio of V=2, in the solution, add 131.7g ammonium bicarbonate solid, fully stir, add mineral acid in the reaction process and keep the pH value of solution constant, after reacting for 160 minutes, gained solid is filtered, and quick washing obtains 36.0g containing Sodium ammonium polyvanadate crystallization. The resulting sodium-containing ammonium polyvanadate is placed in a sealed reactor, according to the NH 4 + : The molar ratio of V=5, in reactor, add ammonium bicarbonate and control the pH value of solution at 8.5, stir under room temperature condition, in solution, separate out light yellow solid, after reaction is finished, solution is filtered, and dry, get final product 33.1 g of ammonium metavanadate solid was obtained, the product purity was 99....

Embodiment 2

[0022] Take 500mL of sodium roasting leaching solution (concentration of vanadium is 25.0g / L), adjust the pH value of the solution to 5.2 with concentrated hydrochloric acid, heat the solution to 35°C, and 4 + : The mass ratio of V=3.0, in the solution, add 100.0g ammonium carbonate solid, fully stir, add mineral acid in the reaction process and keep the pH value of solution constant, after reacting for 140 minutes, the gained solid is filtered, and quick washing obtains 29.7g containing sodium Ammonium polyvanadate crystallization. The resulting sodium-containing ammonium polyvanadate is placed in a sealed reactor, according to the NH 4 + : Molar ratio of V=4.0, add NH to the reactor 4 HCO 3 And control the pH value of the solution at 8.0, stir at room temperature, and a light yellow solid is precipitated in the solution. After the reaction is completed, the solution is filtered and dried to obtain 26.7 g of ammonium metavanadate solid, and the product purity is 99.9%. Th...

Embodiment 3

[0024] Take 500mL of sodium roasting leaching solution (concentration of vanadium is 21.3g / L), adjust the pH value of the solution to 5.5 with concentrated nitric acid, heat the solution to 40°C, and 4 + : The mass ratio of V=2.5, in the solution, add 116.9g ammonium bicarbonate solid, fully stir, add mineral acid in the reaction process and keep the pH value of the solution constant, after reacting for 120 minutes, the gained solid was filtered, and washed quickly to obtain 25.2g containing Sodium ammonium polyvanadate crystallization. The resulting sodium-containing ammonium polyvanadate is placed in a sealed reactor, according to the NH 4 + : The molar ratio of V=5.0, in reactor, add ammonium bicarbonate and control the pH value of solution at 8.3, stir under room temperature condition, precipitate light yellow solid in the solution, after reaction is finished, solution is filtered, dry, can obtain Ammonium metavanadate solid was 23.0 g, the product purity was 99.9%, and...

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Abstract

The invention discloses a method for preparing ammonium metavanadate from a vanadium extraction leaching solution, comprising the following steps of: adjusting the pH value of the vanadium extraction leaching solution to 5-5.5 by using inorganic acid, then heating to the temperature of 30-40 DEG C, subsequently adding a soluble ammonium salt into the solution according to the mass ratio of NH4+:V=2.0-3.0, fully and uniformly stirring, and obtaining ammonium polyvanadate containing sodium after the reaction is finished; putting the obtained ammonium polyvanadate containing sodium into a sealed reactor, adding the soluble ammonium salt into the reactor according to the mol ratio of NH4+:V=3.0-5.0, slowly, uniformly stirring under the room temperature by controlling the pH value in the range of 7.5-8.5 and filtering the obtained solution after the reaction is finished to obtain an ammonium metavanadate solid.

Description

technical field [0001] The invention relates to a method for preparing ammonium metavanadate from vanadium extraction leaching solution. Background technique [0002] At present, the preparation of ammonium metavanadate at home and abroad is mainly extracted from the vanadium-containing sodium roasting leachate. "Vanadium and Titanium Materials" (written by Yang Shaoli, published by Metallurgical Industry Press on August 31, 2007) introduces the ammonium metavanadate precipitation method, which is to add ammonium chloride or sulfuric acid to the vanadium extraction leachate after purification. Ammonium, the pH value of the solution is controlled at about 8 during precipitation, and the temperature is controlled at 20-30°C to obtain precipitation of ammonium metavanadate. The reaction principle is NaVO 3 +NH 4 Cl=NH 4 VO 3 ↓+NaCl. This method is simple in process and easy to operate, but the waste liquid contains 1-2.5g / L of vanadium, consumes a lot of ammonium, and the ...

Claims

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Application Information

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IPC IPC(8): C22B34/22C01G31/00
Inventor 陈亮李千文李大标
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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