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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 problems such as the tedious operation process of weakly basic anion exchange resin, and achieve the effect of good tungsten removal effect, reduced difficulty and simple operation

Active Publication Date: 2015-01-14
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 3 6.0g / L sodium molybdate solution, the initial pH of the solution is 9.2. Make it flow through an ion exchange column of Φ20×350mm at an even speed. The ion exchange column is equipped with a macroporous chelating ion exchange resin (D403, the height of the resin bed is 300mm). Control the flow rate of the feed liquid to 1.35ml / min, and make the contact reaction time between the feed liquid and the resin 70min. When the throughput of the sodium molybdate solution is 10 times the volume of the resin in the ion exchange column, the exchange will be stopped, and the Mo concentration in the resulting post-delivery solution will be 27.5g / L, WO 3 The concentration is 0.18g / L, and the tungsten removal rate is 97%.

[0032] According to the flow rate of the previous step, continue to pass pure water 2 times the volume of the resin in the ion exchange column, and then use a 6% NaOH solution to desorb the resin in the ion exchange column. Control the f...

Embodiment 2

[0034] Containing Mo100g / L, Containing WO 3 1.0g / L sodium molybdate solution is neutralized with 20% sulfuric acid solution to pH=8, and then it flows through an ion exchange column of Φ20×350mm at an even 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 0.78ml / min, so that the contact reaction time of the sodium molybdate solution and the resin is 120min. When the throughput of the sodium molybdate solution is 7 times the volume of the resin in the ion exchange column, the exchange is stopped, and the WO 3 The concentration is 0.07g / L, and the tungsten removal rate is 93%.

[0035] Continue to pass in pure water 1.5 times the volume of the resin in the ion exchange column at the flow rate of the previous step, and then use a 3% NaOH solution to desorb the resin in the ion exchange column. Control the flow rate to 1.9ml / min to make the desor...

Embodiment 3

[0037] Containing Mo100g / L, Containing 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 flowed through an ion exchange column of Φ20×350mm at an even speed. 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 0.78ml / min, so that the contact reaction time of the sodium molybdate solution and the resin is 120min. When the throughput of the sodium molybdate solution is 7 times the volume of the resin in the ion exchange column, the exchange is stopped, and the Mo concentration in the resulting post-delivery solution is 98g / L, WO 3 The concentration is 0.07g / L, V 2 O 5 0.06g / L, the tungsten removal rate is 93%, and the vanadium removal rate is 95%.

[0038] Continue to pass in pure water 1.5 times the volume of the resin in the ion exchange column at the flow rate of the previo...

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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 non-ferrous metal extraction, and specifically relates to a method for deeply removing tungsten from a molybdate solution containing tungsten. Background technique [0002] Molybdenum and tungsten belong to the VIB subgroup of the periodic table of elements, and are in the fifth and sixth cycles respectively. Due to the similar ionic radius, their complexing ability and other chemical properties are also similar, which makes it difficult to effectively separate tungsten and molybdenum. Tungsten is also a strictly controlled impurity element in molybdenum products. Therefore, when processing molybdenum materials with high tungsten content, effective methods must be used to pre-purify the molybdate solution for tungsten removal. [0003] In order to remove tungsten from the molybdate solution, patent CN101264933A proposes a method for deep purification and removal of trace tungsten from a high-concentration molybdate soluti...

Claims

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Application Information

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