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Compound solvent for extraction separation of tungsten and molybdenum and using method thereof

An extraction and solvent technology, applied in the field of metallurgy, can solve problems such as the inability to meet the high purification requirements of tungsten and molybdenum, and achieve the effects of reducing equipment investment and energy loss, less loss, and cheaper prices

Inactive Publication Date: 2013-02-13
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the prior art that the extraction and removal of molybdenum cannot meet the high purification requirements of the separation of tungsten and molybdenum when the concentration of tungsten is high, the present invention provides a compound solvent for extraction and separation of tungsten and molybdenum and its use method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for extracting and separating tungsten and molybdenum using a compound solvent, comprising the following steps:

[0042] Step 1. Prepare compound solvent

[0043] Take analytically pure reagent N 1923 with P 204 mixed to make a compound solvent, wherein, N 1923 The volume accounts for 30% of the total volume of the compound solvent;

[0044] Step 2. Extraction

[0045] The organic phase is the compound solvent described in claim 1, and the aqueous phase is a sodium tungstate molybdate solution that uses sulfuric acid to adjust the pH value to 3 to 4. The specific extraction conditions are as follows:

[0046] Compared: the volume ratio of the organic phase to the aqueous phase is 0.5;

[0047] Extraction temperature: 5~45℃;

[0048] Extraction contact time: 10min;

[0049] Extraction stages: 3;

[0050] Step 3: Countercurrent washing

[0051] The organic phase is the organic phase obtained after the extraction in step two, and the washing agent is dist...

Embodiment 2

[0065] A method for extracting and separating tungsten and molybdenum using a compound solvent, comprising the following steps:

[0066] Step 1. Prepare compound solvent

[0067] Take analytically pure reagent N 1923 with P 204 mixed to make a compound solvent, wherein, N 1923 The volume accounts for 50% of the total volume of the compound solvent;

[0068] Step 2. Extraction

[0069] The organic phase is the compound solvent described in claim 1, and the aqueous phase is a sodium tungstate molybdate solution that uses sulfuric acid to adjust the pH value to 3 to 4. The specific extraction conditions are as follows:

[0070] Compared: the volume ratio of the organic phase to the aqueous phase is 2;

[0071] Extraction temperature: 5~45℃;

[0072] Extraction contact time: 15min;

[0073] Extraction stages: 6;

[0074] Step 3: Countercurrent washing

[0075] The organic phase is the organic phase obtained after the extraction in step two, and the washing agent is distil...

Embodiment 3

[0089] A method for extracting and separating tungsten and molybdenum using a compound solvent, comprising the following steps:

[0090] Step 1. Prepare compound solvent

[0091] Take analytically pure reagent N 1923 with P 204 mixed to make a compound solvent, wherein, N 1923 The volume accounts for 70% of the total volume of the compound solvent;

[0092] Step 2. Extraction

[0093] The organic phase is the compound solvent described in claim 1, and the aqueous phase is a sodium tungstate molybdate solution that uses sulfuric acid to adjust the pH value to 3 to 4. The specific extraction conditions are as follows:

[0094] Compared: the volume ratio of the organic phase to the aqueous phase is 4;

[0095] Extraction temperature: 5~45℃;

[0096] Extraction contact time: 20min;

[0097] Extraction stages: 8;

[0098] Step 3: Countercurrent washing

[0099] The organic phase is the organic phase obtained after the extraction in step two, and the washing agent is distil...

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PUM

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Abstract

A compound solvent for extraction separation of tungsten and molybdenum is prepared by mixing extractant secondary carbon primary amine and Di-(2-ethylhexyl) phosphoric acid, wherein the volume of the secondary carbon primary amine occupies for 30-70% of the total volume, and the balance is the Di-(2-ethylhexyl)phosphoric acid. The separation of tungsten and molybdenum can be achieved by sequentially using the compound solvent to perform extracting, countercurrent washing and reextraction through (NH4)2CO3. The compound solvent replaces a single extractant to separate tungsten and molybdenum, and due to synergistic effect, the partition coefficient of molybdenum is remarkably improved, so that the content of molybdenum oxide in sodium tungstate solution is reduced to lower than 10ppm, the loss of tungsten during the molybdenum removing process is reduced to lower than 0.1%, and the recovery rate of molybdenum is larger than 95%.

Description

technical field [0001] The invention relates to extraction and separation in the field of metallurgy, in particular to a compound solvent for extraction and separation of tungsten and molybdenum and a use method thereof. Background technique [0002] Extraction is one of the effective means of separating elements with similar properties, and it is also a common method for separating tungsten and molybdenum. Therefore, scholars at home and abroad have carried out a large number of tungsten and molybdenum extraction studies using different extractants. The traditional classic molybdenum removal method is to precipitate MoS 3 Based on this, this precipitation method is not only difficult to meet the high purification requirements of molybdenum removal, but also has a considerable loss of tungsten due to co-precipitation. At the same time, due to the large amount of hydrogen sulfide gas produced in the process, it caused serious environmental pollution and was gradually eliminat...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B34/34C22B34/36
CPCY02P10/20
Inventor 刘振张辉常庆辉秦伟孙海红马向东马建华孙鲜明
Owner HENAN UNIV OF SCI & TECH
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