Method for purifying and enriching low-concentration vanadium-containing water solution

Abstract

The invention relates to a method for purifying and enriching a low concentration water solution with vanadium content. The technical proposal is as follows: a purifying agent with the concentration ranging from 0.6 to 10g / L is added into the low concentration water solution containing vanadium with the concentration of V2O5 of ranging from 2000 to 5000mg / L, the mixture is mixed evenly with a pH value ranging from 6 to 8; the low concentration water solution containing vanadium performs the ion exchange adsorption through the strongly basic anion ion exchange resin at a speed of 2.0 to 10mLh<-1>mL<-1> wet resin to the adsorption and saturation of the strongly basic anion ion exchange resin to obtain the resin containing vanadium and the adsorption under liquid; and then the mixing solution of 3 to 5wt percent of sodium hydroxide and 8 to 13wt percent of sodium chloride is prepared to be as a strippant, the use level of the strippant is three to five times of the volume of the resin containing vanadium, the strippant performs the desorption through the resin containing vanadium at a speed of 0.8 to 1.6 mLh<-1>mL<-1> wet resin to obtain the vanadium enriching fluid; finally, the purifying agent with the concentration ranging from 0.1 to 2.5g / L is added into the vanadium enriching fluid, the purified fluid is obtained after the solid-fluid separation. The method has the characteristics that the purifying time is shortened, the purifying agent consumption is reduced, the vanadium loss is reduced, the purifying effect is good and the technique is simple.

Description

technical field

[0001] The invention belongs to the technical field of purification and enrichment of vanadium-containing aqueous solution. In particular, it relates to a method for purifying and enriching low-concentration vanadium-containing aqueous solution. Background technique

[0002] The vanadium grade of most vanadium-containing raw materials is relatively low, and the wet vanadium extraction process is mainly used at home and abroad. Due to the differences in vanadium-containing raw materials and overall process requirements, water leaching still plays an important role in the wet vanadium extraction process.

[0003] Because the vanadium grade of the vanadium-containing raw material is usually low, the concentration of vanadium in the vanadium-containing solution obtained by leaching is also low, and the content of impurities such as other metal ions in the solution is relatively high. If the vanadium precipitation operation is directly carried out, the obtained V...

Examples

Embodiment 1

[0014] A method for purifying and enriching low-concentration vanadium-containing aqueous solution, the method for purifying and enriching such as figure 1 shown: first at V 2 o 5 Add 0.6-5.8g / L CaCl to the low concentration vanadium-containing aqueous solution with a concentration of 2000-3500mg / L 2 , adjust to pH = 6-8 after mixing; then the low-concentration vanadium-containing aqueous solution is -1 ·mL -1 The speed of the wet resin is ion-exchange adsorption through the strong basic anion exchange resin of model 201×7 until the strong basic anion exchange resin of model 201×7 is adsorbed and saturated to obtain vanadium-containing resin and adsorption liquid; then prepare 3~ The mixed solution of 4wt%NaOH+8~11wt%NaCl is used as the desorbent, the consumption of the desorbent is 3~4 times of the volume of the vanadium-containing resin, and the desorbent is 0.8~1.1mL·h -1 ·mL -1 The speed of the wet resin is desorbed by the vanadium-containing resin to obtain a vanadiu...

Embodiment 2

[0016] A method for purifying and enriching low-concentration vanadium-containing aqueous solution, the method for purifying and enriching such as figure 1 shown: first at V 2 o 5 Add 5.8-10g / L Ca(NO 3 ) 2 , adjust to pH = 6-8 after mixing; then the low-concentration vanadium-containing aqueous solution is -1 ·mL -1 The speed of the wet resin is ion-exchange adsorption through the strong basic anion exchange resin of model 201×4 until the strong basic anion exchange resin of model 201×4 is adsorbed and saturated to obtain vanadium-containing resin and adsorption liquid; then prepare 4~ A mixed solution of 5wt% NaOH+11-13wt% NaCl is used as a desorbent, the amount of the desorbent is 4-5 times the volume of the vanadium-containing resin, and the amount of the desorbent is 1.3-1.4mL h -1 ·mL -1 The speed of the wet resin is desorbed by the vanadium-containing resin to obtain a vanadium-rich solution; finally, 1.2-2.5g / L Ca(NO 3 ) 2 , solid-liquid separation to obtain pur...

Embodiment 3

[0018] A method for purifying and enriching low-concentration vanadium-containing aqueous solution, the method for purifying and enriching such as figure 1 shown: first at V 2 o 5 Add 0.6-4.6g / L MgCl to the low-concentration vanadium-containing aqueous solution with a concentration of 2000-3000mg / L 2 , adjust to pH = 6-8 after mixing; then the low-concentration vanadium-containing aqueous solution is -1 ·mL -1 The speed of the wet resin is carried out ion exchange adsorption by the strongly basic anion exchange resin of model D202, until the strong basic anion exchange resin of model D202 is adsorbed and saturated to obtain vanadium-containing resin and adsorption liquid; then prepare 3~4wt%NaOH+ A mixed solution of 8-11wt% NaCl is used as a desorbent, the amount of the desorbent is 3-4 times the volume of the vanadium-containing resin, and the amount of the desorbent is 1.1-1.3mL·h -1 ·mL -1 The speed of the wet resin is desorbed by the vanadium-containing resin to obtai...

technical field

[0001] The invention belongs to the technical field of purification and enrichment of vanadium-containing aqueous solution. In particular, it relates to a method for purifying and enriching low-concentration vanadium-containing aqueous solution. Background technique

[0002] The vanadium grade of most vanadium-containing raw materials is relatively low, and the wet vanadium extraction process is mainly used at home and abroad. Due to the differences in vanadium-containing raw materials and overall process requirements, water leaching still plays an important role in the wet vanadium extraction process.

[0003] Because the vanadium grade of the vanadium-containing raw material is usually low, the concentration of vanadium in the vanadium-containing solution obtained by leaching is also low, and the content of impurities such as other metal ions in the solution is relatively high. If the vanadium precipitation operation is directly carried out, the obtained V...

Examples

Embodiment 1

[0014] A method for purifying and enriching low-concentration vanadium-containing aqueous solution, the method for purifying and enriching such as figure 1 shown: first at V 2 o 5 Add 0.6-5.8g / L CaCl to the low concentration vanadium-containing aqueous solution with a concentration of 2000-3500mg / L 2 , adjust to pH = 6-8 after mixing; then the low-concentration vanadium-containing aqueous solution is -1 ·mL -1 The speed of the wet resin is ion-exchange adsorption through the strong basic anion exchange resin of model 201×7 until the strong basic anion exchange resin of model 201×7 is adsorbed and saturated to obtain vanadium-containing resin and adsorption liquid; then prepare 3~ The mixed solution of 4wt%NaOH+8~11wt%NaCl is used as the desorbent, the consumption of the desorbent is 3~4 times of the volume of the vanadium-containing resin, and the desorbent is 0.8~1.1mL·h -1 ·mL -1 The speed of the wet resin is desorbed by the vanadium-containing resin to obtain a vanadiu...

Embodiment 2

[0016] A method for purifying and enriching low-concentration vanadium-containing aqueous solution, the method for purifying and enriching such as figure 1 shown: first at V 2 o 5 Add 5.8-10g / L Ca(NO 3 ) 2 , adjust to pH = 6-8 after mixing; then the low-concentration vanadium-containing aqueous solution is -1 ·mL -1 The speed of the wet resin is ion-exchange adsorption through the strong basic anion exchange resin of model 201×4 until the strong basic anion exchange resin of model 201×4 is adsorbed and saturated to obtain vanadium-containing resin and adsorption liquid; then prepare 4~ A mixed solution of 5wt% NaOH+11-13wt% NaCl is used as a desorbent, the amount of the desorbent is 4-5 times the volume of the vanadium-containing resin, and the amount of the desorbent is 1.3-1.4mL h -1 ·mL -1 The speed of the wet resin is desorbed by the vanadium-containing resin to obtain a vanadium-rich solution; finally, 1.2-2.5g / L Ca(NO 3 ) 2 , solid-liquid separation to obtain pur...

Embodiment 3

[0018] A method for purifying and enriching low-concentration vanadium-containing aqueous solution, the method for purifying and enriching such as figure 1 shown: first at V 2 o 5 Add 0.6-4.6g / L MgCl to the low-concentration vanadium-containing aqueous solution with a concentration of 2000-3000mg / L 2 , adjust to pH = 6-8 after mixing; then the low-concentration vanadium-containing aqueous solution is -1 ·mL -1 The speed of the wet resin is carried out ion exchange adsorption by the strongly basic anion exchange resin of model D202, until the strong basic anion exchange resin of model D202 is adsorbed and saturated to obtain vanadium-containing resin and adsorption liquid; then prepare 3~4wt%NaOH+ A mixed solution of 8-11wt% NaCl is used as a desorbent, the amount of the desorbent is 3-4 times the volume of the vanadium-containing resin, and the amount of the desorbent is 1.1-1.3mL·h -1 ·mL -1 The speed of the wet resin is desorbed by the vanadium-containing resin to obtai...

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