Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for purifying and removing rhenium from ammonium paratungstate

A technology of ammonium paratungstate and ammonium tungstate, applied in the field of purification and removal of rhenium, can solve the problems of inability to separate and remove, and achieve good adsorption effect.

Active Publication Date: 2018-03-09
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current methods for separating tungsten and rhenium are mainly to deal with materials with a similar proportion of tungsten and rhenium or a large content of tungsten and rhenium, and it is impossible to separate and remove rhenium from materials containing trace amounts of rhenium in tungsten

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method for purifying and removing rhenium from ammonium paratungstate whose rhenium content is 18ppm is:

[0028] Step 1. Dissolution: Dissolve 57g of sodium hydroxide (analytical pure) in 4.425L of water to obtain a sodium hydroxide solution, then dissolve 100g of ammonium paratungstate with a rhenium content of 18ppm in the sodium hydroxide solution, and react with the sodium hydroxide , finally obtain the alkaline solution of sodium tungstate; the mass concentration of NaOH in the alkaline solution of sodium tungstate is 6g / L, WO 3 The mass concentration is 20g / L;

[0029] Step 2, adsorption: pass the alkaline solution of sodium tungstate described in step 1 through the - The ion exchange column of type 201×7 resin performs dynamic ion exchange, when the effluent of the ion exchange column contains WO 3 The mass concentration and WO in the influent 3 At the same mass concentration, Cl - Type 201 × 7 resin adsorption saturation, then stop the ion exchange; the e...

Embodiment 2

[0033] The method for purifying and removing rhenium from ammonium paratungstate with a rhenium content of 15ppm is:

[0034] Step 1. Dissolving: Dissolve 44.6g of sodium hydroxide (analytically pure) in 3.54L of water to obtain a sodium hydroxide solution, then dissolve 100g of ammonium paratungstate with a rhenium content of 15ppm in the sodium hydroxide solution, and react with sodium hydroxide reaction, finally obtain the alkaline solution of sodium tungstate; the mass concentration of NaOH in the alkaline solution of sodium tungstate is 4g / L, WO 3 The mass concentration is 25g / L;

[0035] Step 2, adsorption: pass the alkaline solution of sodium tungstate described in step 1 through the - The ion exchange column of type 201×7 resin performs dynamic ion exchange, when the effluent of the ion exchange column contains WO 3 The mass concentration and WO in the influent 3 At the same mass concentration, Cl - Type 201 × 7 resin adsorption saturation, then stop the ion exchan...

Embodiment 3

[0039] The method for purifying and removing rhenium from ammonium paratungstate whose rhenium content is 22ppm is:

[0040] Step 1. Dissolution: Dissolve 58.8g of sodium hydroxide (analytically pure) in 3.54L of water to obtain a sodium hydroxide solution, then dissolve 100g of ammonium paratungstate with a rhenium content of 22ppm in the sodium hydroxide solution, and react with sodium hydroxide reaction, finally obtain the alkaline solution of sodium tungstate; the mass concentration of NaOH in the alkaline solution of sodium tungstate is 8g / L, WO 3 The mass concentration is 25g / L;

[0041] Step 2, adsorption: pass the alkaline solution of sodium tungstate described in step 1 through the - The ion exchange column of type 201×7 resin performs dynamic ion exchange, when the effluent of the ion exchange column contains WO 3 The mass concentration and WO in the influent 3 At the same mass concentration, Cl - Type 201 × 7 resin adsorption saturation, then stop the ion exchan...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for removing rhenium from ammonium paratungstate through purification. The method comprises steps as follows: step one, dissolving: ammonium paratungstate with rhenium content higher than 15 ppm is dissolved with a sodium hydroxide solution, and an alkaline solution of sodium tungstate is obtained; step two, adsorption: the alkaline solution of sodium tungstate is subjected to dynamic ion exchange, and ion exchange is stopped after adsorption saturation; step three, desorption: a 10g / L NH4Cl and 1mol / L NH3.H2O solution is adopted for leaching, then 5mol / L NH4Cl and 2mol / L NH3.H2O solution is utilized for desorption, and a pure ammonium tungstate solution is obtained; step four, crystallization: the pure ammonium tungstate solution is subjected to evaporative crystallization, a crystallizing rate is controlled to be not higher than 80%, and the ammonium paratungstate crystals with the rhenium content lower than 5 ppm are obtained. The preparation of higher-purity ammonium paratungstate obtained through purification of ammonium paratungstate containing trace of rhenium impurities is realized, so that the requirement of certain special materials for low rhenium content of tungsten is met.

Description

technical field [0001] The invention belongs to the technical field of metallurgical purification, in particular to a method for purifying and removing rhenium from ammonium paratungstate. Background technique [0002] Tungsten has the highest melting point and boiling point among metal elements, but also has high density, high strength, high sound velocity, superior corrosion resistance and radiation resistance, as well as good thermal properties and low sputtering yield strength , And widely used in iron and steel metallurgy, national defense and aerospace, electronics and other industries. [0003] The effect of impurity element content on the properties of tungsten materials and tungsten alloys has gradually been recognized by people. High-purity tungsten (99.999% by mass) or ultra-high-purity tungsten (99.9999% by mass) has the characteristics of high electrical conductivity to electron migration, high temperature stability, and the ability to form stable silicides. It...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00
CPCC01G41/003C01P2006/80
Inventor 吴永谦操齐高陈昆昆张卜升郭瑞
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH