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Clean vanadium extracting method for high-calcium raw material containing vanadium

A high-calcium and raw material technology is applied in the field of vanadium extraction from high-calcium vanadium-containing raw materials and clean vanadium extraction from high-calcium vanadium-containing raw materials, which can solve problems such as complex processes and pollution, achieve efficient vanadium extraction, reduce evaporation, and reduce vanadium extraction. The effect of energy consumption

Active Publication Date: 2019-03-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of extracting vanadium produces pollution, and the process is complex

Method used

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  • Clean vanadium extracting method for high-calcium raw material containing vanadium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Mix the concentrated lye, lime and steel slag with a CaO content of 30% evenly and add it to the pressure reaction kettle. 1% of vanadium-containing steel slag. The pressure leaching reaction temperature is 175°C, and the reaction time is 1h. After the reaction is completed, the reaction kettle is cooled to 70° C., the reaction kettle is opened, and the mixed slurry is filtered and separated to obtain a vanadium-containing leaching solution.

[0062] When the vanadium concentration in the leaching solution is 10g / L, dilute the leaching solution to a NaOH concentration of 10%, then add lime according to the Ca:V molar ratio of 0.4:1 for vanadium precipitation, the vanadium precipitation temperature is 90°C, and the vanadium precipitation time is 1h . The slurry after vanadium precipitation is filtered to obtain calcium vanadate and solution after vanadium precipitation. After vanadium precipitation, the solution is evaporated and concentrated to 20%, and then returned...

Embodiment 2

[0064] Mix the concentrated lye, lime and steel slag with a CaO content of 40% evenly and add it to the pressure reactor. 2% of vanadium-containing steel slag. The pressure leaching reaction temperature is 168°C, and the reaction time is 3h. After the reaction is completed, the reaction kettle is cooled to 90° C., the reaction kettle is opened, and the mixed slurry is filtered and separated to obtain a vanadium-containing leaching solution.

[0065] When the concentration of vanadium in the leaching solution is 12g / L, dilute the leaching solution to a NaOH concentration of 11%, and then add lime according to the ratio of Ca:V molar ratio of 0.6:1 for vanadium precipitation. The vanadium precipitation temperature is 92°C and the vanadium precipitation time is 1.5 h. The slurry after vanadium precipitation is filtered to obtain calcium vanadate and solution after vanadium precipitation. After the vanadium precipitation, the liquid is evaporated and concentrated to 22%, and th...

Embodiment 3

[0067] Mix the concentrated lye, calcium hydroxide and steel slag with a CaO content of 35% and add it into the pressure reactor. Calcium oxide is added in an amount of 3% of the vanadium-containing steel slag. The pressure leaching reaction temperature is 140°C, and the reaction time is 2h. After the reaction is completed, the reaction kettle is cooled to 85° C., the reaction kettle is opened, and the mixed slurry is filtered and separated to obtain a vanadium-containing leaching solution.

[0068] When the concentration of vanadium in the leaching solution is 13g / L, dilute the leaching solution to a NaOH concentration of 12%, then add lime according to the ratio of Ca:V molar ratio of 0.8:1 for vanadium precipitation, the vanadium precipitation temperature is 93°C, and the vanadium precipitation time is 2h . The slurry after vanadium precipitation is filtered to obtain calcium vanadate and solution after vanadium precipitation. After the vanadium precipitation, the liquid...

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Abstract

The invention provides a clean vanadium extracting method for a high-calcium raw material containing vanadium. The method comprises the following steps that (1) alkaline liquor, a residue solidifyingagent and the high-calcium raw material are mixed, and after the leaching reaction, mixed paste is obtained; (2) the mixed paste obtained in the step (1) is filtered and separated, tailings and leaching liquid containing vanadium are obtained, and the leaching liquid is subjected to the operation in the step (1); (3) the steps (1) and (2) are repeated, concentration of vanadium in the leaching liquid is improved, and after dilution, diluent is obtained; (4) a vanadium precipitation agent is added into the dilution for vanadium precipitation, and after filtering, vanadic acid calcium and vanadium post-precipitation liquid are obtained. The vanadium extracting method is clean, pollution-free, low in cost, high in efficiency, simple in technology, short in process, and suitable for industrialapplication.

Description

technical field [0001] The invention relates to the technical field of vanadium chemical metallurgy, and relates to a method for extracting vanadium from a high-calcium vanadium-containing raw material, in particular to a method for cleanly extracting vanadium from a high-calcium vanadium-containing raw material. Background technique [0002] High-calcium vanadium-containing raw materials usually include vanadium-containing steel slag and some vanadium-containing tailings with high calcium content, among which vanadium-containing steel slag is an important vanadium-containing raw material. Vanadium-containing steel slag is a by-product of smelting vanadium-titanium magnetite, and is formed by vanadium-containing molten iron steelmaking. 2 o 5 In 2-10% steel slag (compared with vanadium slag, its calcium content is larger), there are two ways to produce it, one is that the residual vanadium in the semi-steel is oxidized into the slag after steelmaking, and the other is that ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B7/04C22B34/22C01G31/00
CPCC01G31/00C22B7/008C22B7/04C22B34/22Y02P10/20
Inventor 杜浩刘彪王少娜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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