Method and system for extracting vanadium from stone coal by compound alkali leaching

A technology of compound alkali and stone coal, applied in the field of vanadium extraction from stone coal, can solve the problems of serious environmental pollution, complicated follow-up treatment, high production cost, etc., and achieve the effect of simple operation process, easy industrialization promotion, and high production cost

Active Publication Date: 2017-10-27
HUNAN LONGE GALLOP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of high production cost, high energy consumption, serious environmental pollution, and complicated follow-up treatment in the original process, and provide a clean and environmentally friendly method that can not only achieve a higher recovery rate of vanadium, but also reduce alkali consumption and production cost of vanadium leaching process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Raw materials: Vanadium-containing stone coal is taken from Anhui area, with a vanadium grade of 0.71%.

[0067] The stone coal is coarsely crushed with a crusher and then ground to a fineness of less than 150 μm by a ball mill. The stone coal is roasted at 850°C for 3.0 hours in a roaster to obtain roasted slag, and the flue gas is collected and purified by a flue gas purifier for future use.

[0068] Grind the stone coal roasting slag with a ball mill, sieve it with a 100-mesh sieve, take the sieve and add it to the leaching tank, and add the compound alkali leaching agent from the compound alkali leaching agent storage tank according to the ratio of liquid to solid (weight ratio) of 2:1. Alkali leaching agent, wherein the concentrations of sodium hydroxide and sodium carbonate in the composite alkali leaching agent are 70g / l and 40g / l respectively, and the alkalinity is 142g / l. Stir the reaction at 95°C in a constant temperature water bath for 2h.

[0069] The mixtu...

Embodiment 2

[0077] Raw materials: Vanadium-containing stone coal is taken from Anhui area, with a vanadium grade of 0.71%.

[0078] The stone coal is roughly crushed by a crusher and then ground to a fineness of less than 150 μm by a ball mill. The stone coal is roasted at 850°C for 2.5 hours in a roaster to obtain roasted slag, and the flue gas is collected by a flue gas purifier for purification.

[0079] Grind the stone coal roasting slag with a ball mill, sieve it with a 100-mesh sieve, take the sieve and add it to the leaching tank, and add the compound alkali leaching agent from the compound alkali leaching agent storage tank according to the ratio of liquid to solid (weight ratio) of 2:1. Alkali leaching agent, wherein the concentrations of sodium hydroxide and sodium bicarbonate in the composite alkali leaching agent are 65g / l and 38g / l respectively, and the alkalinity is 132g / l. The reaction was stirred for 2.0 h under a constant temperature water bath at 90°C.

[0080]The mixtu...

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Abstract

The invention relates to a method and a system for extracting vanadium from stone coal by compound alkali leaching, and particularly provides a method and a system for extracting vanadium from the stone coal. The method comprises the steps of A, roasting stone coal powder to obtain a stone coal roasting residue, B, leaching the stone coal roasting residue by a compound alkali leaching agent, and performing solid-liquid separation to obtain a leaching solution and a leaching residue, C, washing the leaching residue by water, and performing solid-liquid separation to obtain a washing solution and a washing residue, D, supplementing compound alkali to the washing solution and the partial leaching solution, and returning to Step B as the compound alkali leaching agent, E, adding a calcium compound to the rest leaching solution for a reaction, and performing solid-liquid separation to obtain an impurity removal solution, and F, supplying carbon dioxide to the impurity removal solution, performing carbonation, separating out sodium carbonate, and performing solid-liquid separation to obtain sodium carbonate and a rich-vanadium solution.

Description

technical field [0001] The invention relates to the technical field of vanadium extraction from stone coal, in particular to a method and system for vanadium extraction from stone coal compound alkali leaching. Background technique [0002] Vanadium is an important alloying element with a wide range of uses. Stone coal is an important vanadium-containing resource in my country, with huge reserves and wide distribution. The valence analysis of vanadium in stone coal shows that vanadium in stone coal mainly exists in four forms: (1) V(III) replaces Al(III) in mica minerals with isomorphism, which is The main form of vanadium in stone coal; (2) vanadium exists in the form of adsorption on the surface of clay minerals and iron oxide colloids; (3) vanadium exists in the form of metal organic complexes; (4) vanadium exists in the form of single Exists in mineral form. Because of the diversification of vanadium in stone coal, it is very difficult to extract vanadium from stone c...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B3/44C22B1/02C22B3/02C22B34/22
CPCC22B1/02C22B3/02C22B3/12C22B3/44C22B34/22Y02P10/20
Inventor 刘耀驰钟楚彬赖学明
Owner HUNAN LONGE GALLOP TECH CO LTD
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