Method of selectively extracting and separating molybdenum from high-phosphorus tungsten- and molybdenum-containing mixed solution

A mixed solution and selective technology, which is applied in the field of tungsten and molybdenum metallurgy, can solve the problem of not being able to directly process and separate molybdenum, and achieve the effect of simple method

Active Publication Date: 2015-07-08
CENT SOUTH UNIV
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Problems solved by technology

For the first time, the method adopts the method of controlling the acid concentration and adding hydrogen peroxide to treat the mixed solution containing high phosphorus tungsten and molybdenum, and then extracts, so that the molybdenum in the mixed solution containing high phos

Method used

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  • Method of selectively extracting and separating molybdenum from high-phosphorus tungsten- and molybdenum-containing mixed solution
  • Method of selectively extracting and separating molybdenum from high-phosphorus tungsten- and molybdenum-containing mixed solution

Examples

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Example Embodiment

[0029] Example 1

[0030] Organic phase composition (volume percentage): 90% TBP + 10% sulfonated kerosene.

[0031] Raw material liquid: a company uses sulfur-phosphorus mixed acid to treat high-molybdenum scheelite leaching liquid, containing WO 3 120.5g / L, Mo 12.05g / L, phosphoric acid concentration 1.3mol / L, sulfuric acid concentration 1.1mol / L.

[0032] Material and liquid adjustment: add 30% H concentration to it 2 O 2 Solution, H 2 O 2 The addition amount is 1.4 times the total number of moles of tungsten and molybdenum. Get WO 3 114.1g / L, Mo 11.41g / L, WO 3 / Mo=10 / 1, the concentration of phosphoric acid is 1.2 mol / L, and the concentration of sulfuric acid is 1 mol / L of hydrogen peroxide solution.

[0033] Extraction separation: the above-mentioned organic phase and the aqueous phase are subjected to 5-stage countercurrent extraction under the condition of 1 / 1, and the organic phase is loaded with 4mol / L aqueous ammonia solution under the condition of 1 / 1. The organic phase is a...

Example Embodiment

[0035] Example 2

[0036] Organic phase composition (volume percentage): 80% TBP + 20% sulfonated kerosene.

[0037] Raw material liquid: the leaching liquid obtained by a company using the method of decomposing high-molybdenum scheelite under alkaline conditions by phosphate, containing WO 3 105.3g / L, Mo 5.27g / L, phosphorus concentration 0.82mol / L, sodium hydroxide concentration 0.4mol / L.

[0038] Material liquid adjustment: add sulfuric acid to it, the final material liquid contains sulfuric acid concentration of 1.4mol / L; and add 30% H 2 O 2 Solution, H 2 O 2 The addition amount is 0.8 times the total moles of tungsten and molybdenum. Finally got WO 3 90.5g / L, Mo 4.53g / L, WO 3 / Mo=20 / 1, phosphorus concentration 0.7mol / L, sulfuric acid concentration 1.4mol / L hydrogen peroxide containing water feed solution.

[0039] Extraction separation: the above-mentioned organic phase and the aqueous phase are subjected to 5-stage countercurrent extraction under the condition of 1 / 1, and the loa...

Example Embodiment

[0041] Example 3

[0042] Organic phase composition (volume percentage): 70% TBP + 30% benzene.

[0043] Original material liquid: material liquid contains WO 3 10.2g / L, Mo 102.9g / L, phosphorus concentration 4.5mol / L, nitric acid concentration 2.6mol / L, hydrochloric acid concentration 1.9mol / L.

[0044] Material and liquid adjustment: add 30% H concentration to it 2 O 2 Solution, H 2 O 2 The addition amount is 1.2 times the total moles of tungsten and molybdenum. Get WO 3 9g / L, Mo 90.8g / L, WO 3 / Mo=1 / 10, phosphorus concentration 4mol / L, nitric acid concentration 2.3mol / L, hydrochloric acid concentration 1.7mol / L hydrogen peroxide containing water feed solution.

[0045] Extraction separation: the above-mentioned organic phase and the aqueous phase are subjected to 7-stage countercurrent extraction under the condition of 2 / 1, and the loaded organic phase is back-extracted with 1mol / L ammonium carbonate aqueous solution under the condition of 2 / 1. After extraction, the organic phase is...

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Abstract

The invention relates to a method of selectively extracting and separating molybdenum from a high-phosphorus tungsten- and molybdenum-containing mixed solution. In the prior art, according to the process of extraction and separation of tungsten and molybdenum through complexation of hydrogen peroxide, when the content of phosphorus in the solution is higher than 0.005 mol/L, the extraction efficiency of the tungsten and the molybdenum is greatly reduced, so that the conventional process of extraction and separation of the tungsten and the molybdenum through complexation of the hydrogen peroxide cannot be used for directly treating the tungsten- and molybdenum-containing mixed solution being higher than 0.005 mol/L in the content of the phosphorus. According to the invention, by means of adjustment and control of the content of acid in the high-phosprous mixed solution, the tungsten and the molybdenum in the mixed solution can be reacted with the phosphorus completely to form tungstomolybdophosphate acid. By means of addition of a proper amount of the hydrogen peroxide, the phosphor-tungstic heteropoly acid and phospho-molybdic heteropoly acid are depolymerized to generate peroxy phosphotungstic acid and peroxy phospho-molybdic acid. By means of TBP as an extraction agent, the peroxy phospho-molybdic acid is extracted into an organic phase and then the loaded organic phase is subjected to reverse-extraction by an alkaline reverse-extraction agent. The method can treat the high-phosphorus tungsten- and molybdenum-containing mixed solution, is low in co-extraction of tungsten, can reach 70% in molybdenum extraction rate in a single stage, is low in the cost of the employed extraction agent and is easy to industrialize.

Description

technical field [0001] The invention belongs to the field of tungsten-molybdenum metallurgy, in particular to a method for selectively extracting and separating molybdenum from a high-phosphorus tungsten-molybdenum mixed solution. Background technique [0002] Tungsten is an indispensable strategic metal in the field of national defense and occupies an important position in the national military strategic reserve. In view of the current situation of resources, it is an inevitable trend to replace black tungsten with scheelite, and it is a strategic choice for the sustainable development of my country's tungsten industry. However, my country's scheelite resource endowment is relatively poor, and there are many impurities such as molybdenum and phosphorus. Tungsten and molybdenum belong to the VIB group in the periodic table of elements. Due to the influence of lanthanide shrinkage, the properties of tungsten and molybdenum are very similar. The separation of molybdenum has b...

Claims

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Application Information

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IPC IPC(8): C22B3/38C22B34/34C22B34/36
CPCY02P10/20
Inventor 赵中伟李永立李江涛王文强
Owner CENT SOUTH UNIV
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