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Method for co-extraction-selective reverse extraction separation of vanadium and chromium from solution containing vanadium and chromium

A selective, solution-based technology, applied in the direction of improving process efficiency, etc., can solve the problems of difficult preparation of pure substances, high impurity entrainment, complicated process, etc., and achieve good effect, high recovery rate of vanadium chromium, and short process.

Active Publication Date: 2021-08-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the extraction and separation of vanadium and chromium in vanadium and chromium-containing solutions mainly uses primary amine extractants to selectively extract vanadium, and then selectively extract chromium; The process is complicated and the cost is high
Chinese patent 200610089232.4 discloses a process for extracting and separating vanadium and chromium with primary-secondary amines, using primary-secondary amines to selectively extract vanadium, leaving chromium in the water phase, then recovering chromium by reduction precipitation, and recovering vanadium by ammonium salt precipitation; The method can realize the separation and recovery of vanadium and chromium, but recovering chromium in the form of hydrated chromium oxide requires a large amount of reducing agent to reduce Cr(VI) to Cr(III). In addition, there are many impurities entrained in the precipitation process of hydrated chromium oxide, and it is difficult to obtain pure substances.

Method used

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  • Method for co-extraction-selective reverse extraction separation of vanadium and chromium from solution containing vanadium and chromium
  • Method for co-extraction-selective reverse extraction separation of vanadium and chromium from solution containing vanadium and chromium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Get 5L and contain V 30g / L, the high chromium vanadium slag sodiumization roasting water leachate (pH is 13.5) that contains V 30g / L, Cr 32g / L, add sulfuric acid to adjust leachate pH value to be 10.5, then make solution and composition into 20% methyl trioctyl Extractant (in formula 1, R 1 ~R 3 is n-octyl; R 4 for CH 3 ;A - for Cl - ) + 30% 2-octanol + 50% aviation kerosene (volume percentage) mixed organic phase, and carried out 14 stages of countercurrent extraction under the condition that the flow ratio was 8:1 to obtain the raffinate and the organic phase O1 loaded with vanadium chromium. During the extraction process, the extraction rate of chromium is 99.9%, and the extraction rate of vanadium is 99.9%.

[0057] After the loaded organic phase O1 was washed, 3-stage countercurrent back extraction was carried out with 15 mol / L sodium hydroxide solution, and the contact concentration of alkali was 4 mol / L to obtain the vanadium-containing back extraction solut...

Embodiment 2

[0066] Get 5L and contain V1.0g / L, Cr 1.5g / L vanadium slag sodiumization roasting water soaking liquid acidic ammonium salt precipitation vanadium mother liquor (pH is 2.5), adds sodium hydroxide and regulates leach solution pH value is 6.0, then solution and Composition is 50% methyl trioctyl extractant (in formula 1, R 1 ~R 3 is n-octyl; R 4 for CH 3 ;A - for CO 3 2- )+50% sulfonated kerosene (volume percent) mixed organic phase, and carried out three-stage countercurrent extraction under the condition that the flow ratio was 1:10, to obtain the raffinate and the organic phase O1 loaded with vanadium and chromium. During the extraction process, the extraction rate of chromium is 99.8%, and the extraction rate of vanadium is 99.7%.

[0067] After the loaded organic phase O1 was washed, 10-stage countercurrent back extraction was carried out with 6 mol / L potassium hydroxide solution, and the contact concentration of alkali was 3 mol / L to obtain vanadium-containing stripp...

Embodiment 3

[0079] Get 5L containing V 20g / L, the vanadium-chromium solid waste residue sodiumization roasting water leaching solution (pH is 12.0) that the phosphorous chemical industry enterprise that Cr 1.5g / L produces, adds hydrochloric acid and regulates the leaching solution pH value to be 8.0, then solution and composition is 5% methyltrinonyl extractant (in formula 1, R 1 ~R3 is n-nonyl, R 4 for CH 3 ;A - for CO 3 2- )+10% tridecyl alcohol+85% No. 200 solvent oil (volume percentage) mixed with the organic phase, and carried out 10 stages of countercurrent extraction under the condition that the flow ratio is 1:5, to obtain the raffinate and the organic phase loaded with vanadium chromium O1. After the loaded organic phase O1 was washed, 8-stage countercurrent back extraction was carried out with 6 mol / L sodium hydroxide solution, and the contact concentration of alkali was 3.5 mol / L to obtain vanadium-containing stripping liquid L1 and negative chromium organic phase O2. The...

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Abstract

The invention discloses a method for co-extraction-selective reverse extraction separation of vanadium and chromium from a solution containing vanadium and chromium. The method comprises the following steps that co-extraction of vanadium and chromium is performed by the aid of an ammonium salt extraction agent, then selective reverse-extraction of vanadium is performed by the aid of an alkaline solution according to the difference of the binding capacity of vanadium and chromium with the extraction agent under specific conditions, and finally, reverse-extraction of chromium is performed by the aid of a chlorine salt or solid-phase precipitation method to realize separation of chromium. Different types of chromium products can be obtained according to different requirements; different types of organic phases can also be adopted according to system requirements. The method has the characteristics of good vanadium and chromium separation effect, short flow, simple technology and high vanadium and chromium recovery rate.

Description

technical field [0001] The invention belongs to the field of metallurgical separation, and in particular relates to a co-extraction-selective stripping method for separating vanadium and chromium from a solution containing vanadium and chromium. Background technique [0002] Vanadium slag is the main industrial raw material for vanadium extraction, and the vanadium slag in my country mainly comes from the pyrometallurgy process of vanadium-titanium magnetite. Vanadium-titanium magnetite is a compound ore in which iron, vanadium, titanium, chromium and other valuable elements coexist. Due to the similar properties of vanadium and chromium, the trend of vanadium and chromium in the pyrometallurgy process is basically the same, and the obtained vanadium slag is actually a chromium-containing vanadium slag. At present, the mainstream process for extracting vanadium from vanadium slag is sodium roasting-water leaching process. Vanadium and chromium are leached in the form of V(...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B34/32C22B3/26
CPCC22B34/22C22B34/32Y02P10/20
Inventor 王明玉胡斌张长达赵士杰廖志琴杨明鄂王学文
Owner CENT SOUTH UNIV
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