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Method for circularly separating vanadium and chromium in vanadium-chromium solution through calcium salt

A solution, vanadium-chromium technology, applied in the direction of calcium/strontium/barium sulfate, improvement of process efficiency, etc., to achieve the effect of simple regeneration process, less environmental damage and excellent regeneration performance

Pending Publication Date: 2022-02-18
四川省绵阳市华意达化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned existing process for separating vanadium and chromium still needs to be continuously improved and explored.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for circulating vanadium and chromium in a vanadium salt circulating, including the following steps:

[0024] Step 1. Take the vanadium chromium solution (vanadium content is 20.93 g / L, the chromium content is 32.8 g / L) 1500 ml, and then calcium oxide is 109.15 g of calcium oxide while stirring. , Solid-liquid separation, solid is calcium vanadate, liquid is a high purity chromium solution, vanadium content is 11.78 mg / L, satisfying chromium salt production indicators, and vanadium separation of 99.4%;

[0025] Step 2, solid vanadate calcium add water After the suspension, the sulfuric acid to adjust the suspension pH is acidic, solid-liquid separation, solid is calcium sulfate as the next round of vanadium chromium separation cycle, liquid is a high concentration vanadium solution The vanadium content is 53.21 g / L;

[0026] The obtained high-purity chromium solution was acidified, evaporated, cooled crystals according to the sulfuric acid method in the chr...

Embodiment 2

[0029] A method for circulating vanadium and chromium in a vanadium salt circulating, including the following steps:

[0030] Step 1, taking vanadium chromium solution (vanadium content is 20.93 g / l, chromium content is 32.8 g / L) 1500 ml, and then 436.60 g of calcium sulfate from Example 1 is added while stirring, and then the solution of sodium hydroxide is adjusted. After the stirring reaction is 60 min, the solid-liquid separation, the solid is calcium vanadate, the liquid is a high-purity chromium solution, the vanadium content is 23.22 mg / L, satisfying the chromium salt production indicator requirements, vanadium separation of 99.89%;

[0031] Step 2, solid vanadate calcium add water After the suspension, the sulfuric acid to adjust the suspension pH is acidic, solid-liquid separation, solid is calcium sulfate as the next round of vanadium chromium separation cycle, liquid is a high concentration vanadium solution The vanadium content is 54.59 g / L;

[0032] The obtain...

Embodiment 3

[0035] A method for circulating vanadium and chromium in a vanadium salt circulating, including the following steps:

[0036] Step 1, taking vanadium chromium solution (vanadium content is 20.93 g / L, chromium content is 32.8 g / L) 1500 ml, and 431.78 g of calcium sulfate from Example 2 is added to 6.5, and then the sulfuric acid adjustment solution is 6.5, stirred. After 30 min, the solid-liquid separation, the solid is calcium vanadate, the liquid is a high-purity chromium solution, and the vanadium content is 33.57 mg / L, which satisfies chromium salt production indicators, and the vanadium separation is 99.84%;

[0037] Step 2, solid vanadate calcium add water After the suspension, the sulfuric acid to adjust the suspension pH is acidic, solid-liquid separation, solid is calcium sulfate as the next round of vanadium chromium separation cycle, liquid is a high concentration vanadium solution The vanadium content is 53.84 g / L;

[0038] The obtained high-purity chromium solu...

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Abstract

The invention discloses a method for circularly separating vanadium and chromium in a vanadium-chromium solution through calcium salt. The method comprises the steps that: a vanadium precipitation agent is added into the vanadium-chromium solution, the pH value of the vanadium-chromium solution is adjusted through an alkaline or acidic substance, stirring reaction is conducted, vanadium in the solution is converted into calcium vanadate, solid-liquid separation is conducted, the solid is calcium vanadate, and the liquid is a pure chromium-containing solution for preparing a high-purity chromium product; and the cleaned calcium vanadate is subjected to acid leaching with sulfuric acid, vanadium in the calcium vanadate enters the solution to form a pure vanadium-containing solution, calcium in the calcium vanadate forms calcium sulfate, the calcium sulfate is separated out as a solid, solid-liquid separation is performed, the solid is calcium sulfate and returns to serve as a vanadium precipitation agent for vanadium-chromium separation, and the liquid is the pure vanadium-containing solution for preparing a high-purity vanadium product. Compared with an existing vanadium and chromium separation method, the method has the advantages that the calcium sulfate serves as the vanadium precipitation agent to be infinitely recycled, impurities are not introduced in the process, dangerous waste residues carrying vanadium and chromium elements are not generated, the three-waste treatment cost is greatly reduced, and environmental harm is small.

Description

Technical field [0001] The present invention belongs to the field of chemical industry, and more particularly to a method of circulating a calcium salt to isolate vanadium and chromium in a vanadium chromium solution. Background technique [0002] Vanadium and chrome are important strategic resources, widely used in metallurgy, aviation, electronics, and defense. Its chemical properties are similar, and in the natural boundaries, in the form of a symbiotic form, the vanadium is difficult to separate from chromium. At present, in the field of vanadium chronic chemicals, the separation of vanadium chromium solution has a lot of precipitation, adsorption, and the like, the vanadium content is selected from the vanadium chromium solution. For example, China Patent CN102676810A separates recovery of vanadium chrome using anion exchange resin, but is high, long, complex, and low in operation, and low-transmission and recovery. It is not applicable to large industrial production. The pr...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B3/08C22B34/32C22B34/22C01F11/46
CPCC22B3/44C22B3/08C22B34/32C22B34/22C01F11/46Y02P10/20
Inventor 尹春林黄先东白礼太帖秀梅王俊朱乐
Owner 四川省绵阳市华意达化工有限公司
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