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Method for preparing high-purity molybdate from rough sodium molybdate solution

A technology for preparing sodium molybdate and molybdate, applied to magnesium, can solve the problems of removing calcium, magnesium, excessive product impurities, affecting product quality, etc., and achieve the effect of effective separation

Inactive Publication Date: 2017-10-27
XINYANG HUARUI MOLYBRENUM NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

When the extraction process uses the high-molybdenum sodium tungstate solution containing calcium and magnesium as the extraction stock solution, the separation of tungsten and molybdenum can be achieved, but it cannot effectively remove impurities such as calcium and magnesium, resulting in impurities such as sodium molybdate in the later stage. Exceeding the standard, affecting product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] ① Primary acid adjustment: Take 500mL of crude sodium molybdate solution obtained after extraction and separation of primary amines. The molybdenum concentration in the solution is 80g / L, the calcium ion concentration is 0.05g / L, and the magnesium ion concentration is 0.002g / L. Add hydrochloric acid to adjust the pH value to 4, the stirring speed is 80r / min, the stirring time is 5min, and the temperature is 298K.

[0027] ② Introduce transformation additive ammonium chloride, the addition is 5% (2g) of molybdenum mass in the experimental crude sodium molybdate solution, the stirring speed is 80r / min, the stirring time is 10min, and the temperature is 298K;

[0028] ③Secondary acid adjustment, transition precipitation: use hydrochloric acid to adjust the pH value of the solution to 1, the stirring speed is 80r / min; the stirring time is 20min, and the temperature is 298K;

[0029] ④ Solid-liquid separation, centrifugal filtration: The solution obtained in ③ is subjected t...

Embodiment 2

[0031] ① One-time acid adjustment: take 500mL of crude sodium molybdate solution obtained after extraction and separation of primary amine, the concentration of molybdenum in the solution is 80g / L, add nitric acid to adjust the pH value to 4, the stirring speed is 80r / min, and the stirring time is 5min. The temperature is 298K.

[0032] ② Introduce the transformation additive ammonium nitrate, the addition amount is 10% (4g) of the molybdenum mass in the experimental crude sodium molybdate solution, the stirring speed is 80r / min, the stirring time is 10min, and the temperature is 298K;

[0033] ③Secondary acid adjustment, transition precipitation: use nitric acid to adjust the pH value of the solution to 1, the stirring speed is 80r / min; the stirring time is 20min, and the temperature is 298K;

[0034] ④ Solid-liquid separation, centrifugal filtration: Centrifuge the solution finally obtained in ③, the centrifuge speed is 800r / min, and the centrifugal filtration time is 20min;...

Embodiment 3

[0036] ① One-time acid adjustment: take 500mL of crude sodium molybdate solution obtained after extraction and separation of primary amine, the concentration of molybdenum in the solution is 80g / L, add sulfuric acid to adjust the pH value of the crude sodium molybdate solution to 4, and the stirring speed is 80r / min, the stirring time is 5min, and the temperature is 298K.

[0037] ② Introduce the transition additive ammonium sulfate, the addition amount is 8% (3.2g) of the mass of molybdenum in the experimental crude sodium molybdate solution, the stirring speed is 80r / min, the stirring time is 10min, and the temperature is 298K;

[0038] ③Secondary acid adjustment, transition precipitation: adjust the pH value of the solution obtained in ② with sulfuric acid to 2, the stirring speed is 80r / min; the stirring time is 20min, and the temperature is 298K;

[0039] ④ Solid-liquid separation, centrifugal filtration: The solution obtained in ③ is subjected to centrifugal filtration,...

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Abstract

The invention discloses a method for preparing high-purity molybdate from a rough sodium molybdate solution. The method mainly comprises the following steps: adding a proper amount of inorganic acid into the rough sodium molybdate solution to perform primary acid regulation until the pH value of the solution is regulated to be 4-5, and stirring the solution for 5 minutes; adding a proper amount of transition additive, and stirring and mixing for 10 minutes; adding a proper amount of inorganic acid to perform secondary acid regulation, regulating the pH value of the solution to be 1-2, and uniformly stirring the solution for 20-30 minutes; performing centrifugal filtration, washing a obtained washing solution for solid, filtering again, and drying to obtain solid, namely high-purity molybdate; and adsorbing centrifugal filtered solution and washing solution with weakly basic macro porous anion resin, and recycling valuable metal molybdenum. The method can realize effective separation of molybdenum, calcium and magnesium in the rough sodium molybdate solution, so that the high-purity molybdate is prepared.

Description

technical field [0001] The invention relates to the field of rare metal metallurgy, in particular to a method for efficiently separating molybdenum, calcium and magnesium from crude sodium molybdate solution, and then preparing high-purity molybdate. Background technique [0002] China is a big country with tungsten and molybdenum resources, but with the decreasing quality of low-molybdenum and low-impurity black tungsten resources, China's tungsten and molybdenum enterprises gradually shift the focus of production raw materials to the field of tungsten resource utilization with high molybdenum and high impurities. The difficulty in separating tungsten and molybdenum is an urgent problem to be solved. With the breakthrough of technology in recent years, the process of separating tungsten and molybdenum by using primary amine as extraction agent and using solvent extraction method has gradually matured. When the extraction process uses the high-molybdenum sodium tungstate so...

Claims

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Application Information

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IPC IPC(8): C01G39/00C22B34/34C22B3/22C22B3/44
CPCC01G39/003C01P2006/80C22B3/22C22B3/44C22B34/34Y02P10/20
Inventor 江亲义曾斌胡亦发袁善禧胡俊杰
Owner XINYANG HUARUI MOLYBRENUM NEW MATERIALS CO LTD
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