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Cleaning technology for extracting vanadium from vanadium containing materials through sodium salt roasting

A technology of sodium roasting and raw materials, applied in the direction of improving process efficiency, etc., can solve the problems of sodium chloride resource cost, environmental pollution, high cost, etc., and achieve the effects of low production cost, environmental friendliness and simple process

Active Publication Date: 2018-11-06
王懿
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AI Technical Summary

Problems solved by technology

The flue gas produced by the sodium roasting of vanadium-containing materials can be sprayed and absorbed by lye to reach the standard discharge, but the cost is high, and a large amount of saline waste water and waste residues are produced. The vanadium in the leachate is enriched by ion exchange. - Competition of ions, Cl in feed solution - The higher the ion, the smaller the exchange capacity of the resin to V, so the material liquid must be diluted before the exchange, and the liquid cannot be returned to continue to use after the exchange, but can only be discharged, resulting in a large amount of saline wastewater, which not only causes sodium chloride Concession of resources, and lead to environmental pollution

Method used

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  • Cleaning technology for extracting vanadium from vanadium containing materials through sodium salt roasting

Examples

Experimental program
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Effect test

Embodiment 1

[0032]10kg of pre-decarburized stone coal mine containing 0.95% vanadium (V) is added with 600g of sodium chloride, mixed and ground to -120 mesh pellets, roasted at 750°C for 2.5h, and the roasted flue gas is absorbed by a filter layer of Ф10-15 lime balls Harmful gases, the calcine is leached with water at room temperature for 3 hours at a solid-to-liquid ratio of 1:2g / mL, and filtered to obtain the water immersion liquid and water leaching residue. Add 1mol / L sodium carbonate solution to the water leaching residue at a solid-to-liquid ratio of 1:2.5g / mL, stir and leaching at 25°C for 3h, filter to obtain the alkali leaching solution and leaching residue, the leaching residue contains 0.15% vanadium (V), vanadium The total leaching rate is 84.5%. Add calcium chloride to the water immersion solution according to 1 times the stoichiometric number of vanadium converted into calcium vanadate, stir at room temperature for 0.5h, filter to obtain calcium vanadate filter cake and so...

Embodiment 2

[0034] Add 150g of sodium chloride to 5kg of stone coal ore powder (-150 mesh) containing 1.13% vanadium (V), use the vanadium-precipitated liquid mass ore obtained in Example 1 to roast at 790°C for 2 hours, and use Ф10 to 15 lime balls for the roasting flue gas The filter layer absorbs the harmful gas therein, and the calcine is added to the vanadium-precipitated solution obtained in Example 1 at a solid-to-liquid ratio of 1:2g / mL and leached at room temperature for 2.5 hours, and filtered to obtain the water leaching liquid and water leaching residue. Water leaching slag was added to the crystallization mother liquor obtained in Example 1 at a solid-to-liquid ratio of 1:3g / mL, stirred and leached at 80°C for 1.5h, and filtered to obtain alkali leaching solution and leaching slag. The leaching slag contained 0.093% vanadium (V). The total leaching rate is 91.8%. The water immersion solution is converted into 1 times of the stoichiometric number of calcium vanadate by vanadiu...

Embodiment 3

[0036] Add 60g of sodium carbonate and 40g of sodium chloride to 500g of vanadium slag containing 13.5% vanadium (V), grind and mix well, roast at 800°C for 3h, add water to the calcine at a solid-to-liquid ratio of 1:3g / mL for 2.5h at 45°C, and filter Obtain water immersion liquid and water leaching residue. Add 1.5mol / L sodium carbonate solution to the water leaching slag at a solid-to-liquid ratio of 1:2.5g / mL, stir and leaching at 65°C for 2h, filter to obtain the alkali leaching solution and leaching slag, the leaching slag contains 0.57% vanadium (V), vanadium The total leaching rate is 95.9%. Add the mixture of calcium oxide and calcium chloride to the water immersion solution according to 1.2 times of the stoichiometric number of vanadium converted into calcium vanadate, stir and ball mill at room temperature for 1.5h, filter to obtain calcium vanadate filter cake and solution after vanadium precipitation, and then add vanadium Stir the calcium acid filter cake into t...

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Abstract

The invention discloses a cleaning technology for extracting vanadium from vanadium containing materials through sodium salt roasting. Sodium chloride is added in the vanadium containing material orefor uniform mixing and fine grinding, nodulizing roasting is conducted, after harmful gases in roasting smoke are removed through an adsorbent, the roasting smoke reaches the standard to be exhausted,obtained roasted ore is subjected to water leaching and then subjected to alkaline leaching, and water is added in the roasted ore for leaching; a water leaching solution and water leaching residuesare obtained through filtration, a sodium carbonate salt solution is added in the water leaching residues for leaching, and an alkaline leaching solution and leaching residues are obtained through filtration; calcium chloride is added in the water leaching solution to deposit enriched vanadium, and calcium vanadate filter cakes and a molybdenum precipitation liquid are obtained through filtration;the molybdenum precipitation liquid returns to the roasted ore water leaching procedure or vanadium containing material ore mixing or nodulizing procedure to be circularly used, the obtained calciumvanadate filter cakes are decomposed through the alkaline leaching solution, and calcium carbonate and vanadium enriching liquid are obtained through filtration; after calcium carbonate is roasted andconverted into calcium oxide, the calcium oxide returns to the high-temperature smoke purification procedure to be continuously used; ammonium salt is added in the vanadium enriching liquid, vanadiumis separated by crystallization, and ammonium metavanadate and crystallization mother liquor thereof are obtained through filtration, the ammonium metavanadate is subjected to pyrolysis, a vanadium pentoxide product is obtained, the crystallization mother liquor directly returns to the alkaline leaching procedure, or after calcium is added for vanadium depositing, the crystallization mother liquor returns to the alkaline leaching procedure to be circularly used. Cyclic utilization of sodium chloride, lime, sodium carbonate salt and water in the technology process is achieved, and the beneficial effects that the technology is simple, the vanadium recycling rate is high, the production cost is low, and cleanliness and environment friendliness are achieved are achieved.

Description

technical field [0001] The invention relates to a cleaning process for vanadium-containing materials to be sodiumized and roasted to extract vanadium. Background technique [0002] Both vanadium slag and stone coal are vanadium-containing materials, and they are the main raw materials for producing vanadium pentoxide. [0003] Vanadium in vanadium slag mainly exists in the form of spinel. At present, the main production process of vanadium slag extracting vanadium is sodium roasting of vanadium slag-water immersion-purification-weak acid ammonium salt precipitation of vanadium-ammonium polyvanadate heating Decomposition of vanadium pentoxide products. Liquid reduction after vanadium precipitation - neutralization of precipitated vanadium chromium - evaporation and concentration of liquid after precipitation to obtain a mixture of ammonium sulfate / sodium sulfate / sodium chloride. The vanadium precipitation liquid treatment process produced by the vanadium slag sodium roastin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/04C22B3/12C22B3/44C22B7/00C22B34/22
CPCC22B1/02C22B3/04C22B3/12C22B3/44C22B7/001C22B7/006C22B7/008C22B34/22Y02P10/20
Inventor 王学文王懿葛奇杜艳苹王明玉
Owner 王懿
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