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Ion-exchange separation method for tungsten and molybdenum in tungstate and molybdate mixed solution

A technology of mixed solution and ion exchange, applied in the field of ion exchange process

Inactive Publication Date: 2011-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned ion exchange process mainly involves the removal of a small amount of molybdenum in high-concentration tungstate solution and the removal of a small amount of tungsten in high-concentration molybdate solution. Separation is not involved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1. Containing Mo30g / L, containing WO 3 6.0g / L sodium tungstate and sodium molybdate mixed solution, after adjusting the pH of the solution to 6.5 with 18% hydrochloric acid, add NaCl to adjust the Cl in the solution - The concentration is 5g / L, so that it flows through two series-connected Ф15×300mm ion exchange columns equipped with D201 macroporous strong basic anion exchange resin at an average speed, and the contact reaction time between the feed liquid and the resin is 90min. Stop the exchange when the throughput of the feed liquid is 5 times the volume of the resin in the two exchange columns, and then use 1mol / L NaCl solution twice the volume of the resin in the single ion exchange column to rinse the first ion exchange column Wash, and combine the resulting eluate with the exchanged solution to obtain a high molybdenum low tungstate sodium tungstate solution, containing Mo 22.5g / L in the solution, containing WO 3 0.35g / L. Analyze the first ion exchan...

Embodiment 2

[0016] Example 2. Containing WO 3 50g / L, containing Mo 6.0g / L mixed solution of sodium tungstate and sodium molybdate, after adjusting the pH of the solution to 7.0 with 18% hydrochloric acid, the Cl in the solution - The concentration is 2.6g / L, so that it flows through two series-connected Ф15×300mm ion exchange columns equipped with D213 macroporous strong basic anion exchange resin at an average speed, and the contact reaction time between the feed liquid and the resin is 120min. Stop the exchange when the throughput of the feed liquid is twice the volume of the resin in the two exchange columns, and then use 1mol / L NaCl solution twice the volume of the resin in the single ion exchange column to rinse the first ion exchange column Wash, and combine the resulting eluate with the exchanged solution to obtain a high molybdenum low tungstate sodium tungstate solution, the solution contains Mo 3.6g / L, contains WO 3 1.6g / L. Analyze the first ion exchange column with a soluti...

Embodiment 3

[0017] Example 3. Containing Mo100g / L, containing WO 3 1.0g / L sodium tungstate and sodium molybdate mixed solution, after adjusting the pH of the solution to 7.0 with 18% hydrochloric acid, add NaCl to adjust the Cl in the solution- The concentration is 12g / L, and then it flows through two series-connected Ф15×300mm ion-exchange columns equipped with D201 macroporous strongly basic anion-exchange resin at an average speed, and the contact reaction time between the feed liquid and the resin is 120min. When the throughput of the feed liquid is 15 times the volume of the resin in the two exchange columns, the exchange is stopped, and the obtained exchanged liquid contains Mo 98g / L, including WO 3 0.09g / L. Use a 1mol / L NaCl solution twice the volume of the resin in a single ion exchange column to rinse the first ion exchange column, and the obtained eluent contains 10g / L Mo and contains WO 3 0.1g / L. Use a solution containing 5mol / L NaCl and 2mol / L NaOH twice the volume of the...

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PUM

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Abstract

The invention discloses an ion-exchange separation method for tungsten and molybdenum in a tungstate and molybdate mixed solution, technically characterized by comprising the following steps of: adjusting the pH of the tungstate and molybdate mixed solution by mineral acid to be appropriate, so that the tungstate ions in the solution are polymerized into paratungstate ions, while molybdenum still exists in the form of tungstate ions; adjusting the concentration of Cl<-> in the solution to be appropriate, enabling the solution to flow through ion exchange columns loaded with macroporous strong base anion exchange resin, so that the tungsten in the solution is absorbed firstly, thereby separating the tungsten from the molybdenum; rinsing a small amount of MoO4<2-> ions absorbed by the resin in the ion exchange columns by a solution with an appropriate concentration of Cl<->; and finally resolving the tungsten absorbed on the resin by using an alkali solution with an appropriate concentration of Cl<-> as a resolving agent to regenerate the resin.

Description

Technical field: [0001] The invention belongs to the field of extraction of non-ferrous metals, specifically an ion exchange process for the separation of tungsten and molybdenum in molybdate and tungstate mixed solutions with similar tungsten and molybdenum contents, and the deep removal of a small amount of tungsten in the molybdate solution . Background technique: [0002] Molybdenum is a strictly controlled impurity element in tungsten products. my country's national standard GB10116-88 stipulates that the content of molybdenum in 0-grade ammonium paratungstate is not more than 20ppm. Molybdenum acid contains no more than 150ppm of tungsten in the product. Molybdenum and tungsten belong to the VIB subgroup elements in the periodic table of elements, and are in the fifth and sixth periods respectively. Due to the similar ionic radius, their complexation ability and other chemical properties are also similar, which makes it difficult to effectively separate tungsten and mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/42C01G39/00C01G41/00C22B34/34C22B34/36
CPCY02P10/20
Inventor 霍广生廖春华李洪桂
Owner CENT SOUTH UNIV
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