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Ion exchange method for removing tungsten from molybdate solution

A technology of ion exchange and ion exchange column, which is applied in the field of non-ferrous metal extraction, can solve the cumbersome operation process of weakly basic anion exchange resin and other problems, and achieve the effect of good tungsten removal effect, simple operation and reduced acid consumption

Active Publication Date: 2014-02-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in practice, the regeneration of weakly basic anion exchange resins has always been a relatively cumbersome operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Contains Mo30g / L, Contains WO 36.0g / L sodium molybdate solution, the initial pH of the solution is 9.2. Make it flow through the Φ20×350mm ion exchange column at an average speed, and the ion exchange column is equipped with a macroporous chelating ion exchange resin (D403, the height of the resin bed is 300mm). The flow rate of the feed liquid is controlled to be 1.35ml / min, so that the contact reaction time between the feed liquid and the resin is 70min. Stop the exchange when the throughput of the sodium molybdate solution is 10 times the volume of the resin in the ion-exchange column, and the Mo concentration in the resulting handover liquid is 27.5g / L, WO 3 The concentration is 0.18g / L, and the tungsten removal rate reaches 97%.

[0032] According to the flow rate of the previous steps, continue to feed pure water twice the volume of the resin in the ion exchange column, then desorb the resin in the ion exchange column with a NaOH solution with a concentration of...

Embodiment 2

[0034] Contains Mo100g / L, Contains WO 3 1.0g / L sodium molybdate solution, neutralized with 20% sulfuric acid solution to pH = 8, then let it flow through a Φ20×350mm ion exchange column at an average speed, and the ion exchange column is equipped with macroporous chelating ion exchange Resin (D403, the resin bed height is 300mm), the flow rate of the feed liquid is controlled to 0.78ml / min, and the contact reaction time between the sodium molybdate solution and the resin is 120min. Stop the exchange when the throughput of the sodium molybdate solution is 7 times the volume of the resin in the ion exchange column, and the WO 3 The concentration is 0.07g / L, and the tungsten removal rate reaches 93%.

[0035] Continue to feed 1.5 times the pure water of the resin volume in the ion-exchange column according to the flow rate of the previous steps, and then desorb the resin in the ion-exchange column with a NaOH solution with a concentration of 3%, and control the flow rate at 1.9m...

Embodiment 3

[0037] Contains Mo100g / L, Contains WO 3 1.0g / L, containing V 2 o 5 1.2g / L sodium molybdate solution, neutralized with 15% hydrochloric acid solution to pH = 8, and then let it flow through a Φ20×350mm ion exchange column at an average speed, and the ion exchange column is equipped with a macroporous chelating ion exchange Resin (D403, the resin bed height is 300mm), the flow rate of the feed liquid is controlled to 0.78ml / min, and the contact reaction time between the sodium molybdate solution and the resin is 120min. Stop the exchange when the throughput of the sodium molybdate solution is 7 times of the resin volume in the ion-exchange column, and the Mo concentration in the gained handover liquid is 98g / L, WO 3 The concentration is 0.07g / L, V 2 o 5 0.06g / L, the tungsten removal rate reaches 93%, and the vanadium removal rate reaches 95%.

[0038] Continue to feed 1.5 times the pure water of the resin volume in the ion-exchange column according to the flow rate of the p...

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Abstract

The invention belongs to the field of nonferrous metal extraction and provides an ion exchange method for removing tungsten from a molybdate solution. The ion exchange method comprises the steps of (1) regulating the pH value of a tungsten-contained molybdate solution to 8.0-11.0 by using an inorganic acid; (2) enabling the solution obtained in the step (1) to flow through macroporous chelation ion exchange resin, and stopping exchanging when the throughput of the solution is 7-12 times of the volume of the resin in an ion exchange column, wherein the contact reaction time of the solution and the resin is 60-180min; (3) enabling pure water to flow through the ion exchange column, and stopping washing when the throughflow of the pure water is 1-2 times of the volume of the resin; (4) desorbing and regenerating. The adopted macroporous chelation ion exchange resin containing meglumine groups has relatively strong preferential chelation and adsorption for WO4<2->, and can be used for directly separating the WO4<2-> and MoO4<2-> without adding a great number of inorganic acids for polymerizing WO4<2->, so that the consumption of the acids can be reduced, and the operation difficulty possibly caused by feed liquid acidification can also be avoided.

Description

technical field [0001] The invention belongs to the field of extraction of nonferrous metals, in particular to a method for deep removal of tungsten from a molybdate solution containing tungsten. Background technique [0002] 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 and similar chemical properties such as complexation ability, it is difficult to effectively separate tungsten and molybdenum. Tungsten is also a strictly controlled impurity element in molybdenum products. Therefore, when dealing with molybdenum raw materials with high tungsten content, it is necessary to use effective methods to remove tungsten from the molybdate solution in advance. [0003] In order to remove tungsten from the molybdate solution, the patent CN101264933A proposes a method for deeply purifying and removing trace tungsten from the high-concentration molybdate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
Inventor 霍广生宋琼彭超卢晓颖
Owner CENT SOUTH UNIV