Ion exchange process for preparing ammonium tungstate solution

A technology of ion exchange and ammonium tungstate, applied in the field of ion exchange technology, can solve the problems of slow adsorption speed, complicated operation, and resin damage, and achieve the effects of reducing crystal precipitation, improving impurity removal efficiency, and inhibiting crystal precipitation

Inactive Publication Date: 2006-11-22
CHENZHOU DIAMOND TUNGSTEN PRODS
0 Cites 10 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Among them, the classic process of using strong basic anion resin 201×7 is: adsorption of dilute sodium tungstate solution-leaching-high concentration NH 4 Ammonium tungstate is obtained by desorption of Cl solution, but the 201×7 resin cannot directly treat the APT crystallization mother liquor, and needs to be heated with alkali to convert it into a normal salt, and the treatment cost is high; the ion exchange of the weakly basic anion resin is mainly used for the recovery of the APT crystallization mother liquor. The ...
View more

Abstract

The invention discloses an ionic exchanging technology to prepare ammonium tungstate solution, which comprises the following steps: adopting acid solution to regenerate for large-hole faintly alkaline negative resin; adjusting each solution with tungsten at 4-5; proceeding resin adsorption disposal; washing to neutral through negative tungsten resin; blending ammonia and ammonium salt; proceeding adsorption through negative tungsten resin after linear-flow speed from rapid to slow; removing impurity; conversing to produce the product. The invention is simple to operate, which guarantees the quality of ammonium tungstate solution.

Application Domain

Process efficiency improvement

Technology Topic

Ion exchangeIon +5

Image

  • Ion exchange process for preparing ammonium tungstate solution

Examples

  • Experimental program(4)

Example Embodiment

[0017] Example 1: Prepare 600g of macroporous weakly basic anion resin (dry resin, the same below), using PH=2 containing SO 4 2- The acidic solution to regenerate the above resin. Take 16L of pure sodium tungstate solution, its WO 3 The content is 69g/l, with SO 4 2- Adjust the acidity of the sodium tungstate solution to pH 4.2, at this time WO 3 The content is 26g/l. The acid-adjusted sodium tungstate solution is passed through the regenerated resin for adsorption. The adsorbed negative tungsten resin is washed with pure water until the PH value is neutral; the concentration of ammonia water is 7mol/L and NH 4 5L of the mixed solution with a Cl concentration of 2mol/L, first use a linear flow rate of 15cm/min and then gradually reduce to 3cm/min to desorb the neutral negative tungsten resin, and the obtained ammonium tungstate solution is evaporated and crystallized to obtain APT. The crystallization rate is 94%, and the quality reaches the APT-0 standard.

Example Embodiment

[0018] Example 2: Prepare 600g of a macroporous weakly basic anion resin, using pH=1.5 containing SO 4 2- The acidic solution to regenerate the above resin. Take 19L of sodium tungstate solution, its WO 3 The content is 69g/l, the mass ratio of tungsten and molybdenum is W:Mo=6500, and the PH=2 containing SO4 2- Acid solution, adjust the pH of the above sodium tungstate solution = 4.9, its WO 3 The content is 26.4g/l. The acid-adjusted sodium tungstate solution is passed through the regenerated resin for adsorption. The adsorbed negative tungsten resin is washed with pure water until the PH value is neutral; the concentration of ammonia water is 8mol/L and NH 4 NO 3 6L of the mixed solution with a concentration of 1.5mol/L, first at a linear flow rate of 14cm/min and then gradually reduced to 2cm/min to desorb the neutral negative tungsten resin, and the obtained ammonium tungstate solution is evaporated and crystallized to obtain APT. Its crystallization rate is 93%, and its quality reaches APT-0 standard.

Example Embodiment

[0019] Example 3: Prepare 600g of macroporous weakly basic anion resin, using Cl containing PH=1.0 - The hydrochloric acid solution to regenerate the above resin. Take WO 3 APT crystallization mother liquor 15L and WO with a content of 48.58g/l 3 16L of slag washing water with a content of 25g/l, the mass ratio of tungsten and molybdenum in the solution is WO 3 :Mo=3600; add 0.5% Na with the volume ratio of tungsten-containing solution 2 S solution, use 2mol/L dilute hydrochloric acid and pH 2.5 containing SO4 2- Of the production waste liquid, adjust the pH of the above solution = 4.21, at this time WO 3 The content is 27g/l. The acid adjusted solution is passed through the above-mentioned regenerated resin for adsorption. The adsorbed negative tungsten resin is washed with pure water until the PH value is neutral; the concentration of ammonia water is 10mol/L and NH 4 NO 3 5L of the mixed solution with a concentration of 2.2mol/L, desorb the neutral negative tungsten resin at a linear flow rate of 14cm/min and then gradually reduce to 2.5cm/min, and the obtained ammonium tungstate solution is evaporated and crystallized to obtain APT , Its crystallization rate is 92%, and its quality reaches APT-0 standard.

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Image sensor and method of manufacturing the same

InactiveUS20110128423A1simple processrealistic image
Owner:SAMSUNG ELECTRONICS CO LTD

Transparent laminate having low emissivity

InactiveCN1476379AInhibit crystallizationImprove wear resistance and durability
Owner:CARDINAL CG +1

Treating method for oily sludge

InactiveCN106957136AThe treatment method is simple and effectiveSimple process
Owner:安徽省通源环境节能股份有限公司

Online detecting method and device of SCR urea nozzle faults

ActiveCN105649735Areduce crystallizationImprove reliability
Owner:WEICHAI POWER CO LTD

Mixing device for diesel engine urea SCR system

ActiveCN102085453Areduce crystallizationcompact structure
Owner:HANGZHOU YINLUN TECH CO LTD +1

Classification and recommendation of technical efficacy words

  • Inhibit crystallization
  • Reduce crystallization

Transparent laminate having low emissivity

InactiveCN1476379AInhibit crystallizationImprove wear resistance and durability
Owner:CARDINAL CG +1

Mixing device for diesel engine urea SCR system

ActiveCN102085453Areduce crystallizationcompact structure
Owner:HANGZHOU YINLUN TECH CO LTD +1

Online detecting method and device of SCR urea nozzle faults

ActiveCN105649735Areduce crystallizationImprove reliability
Owner:WEICHAI POWER CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products