Method for vanadium leaching by sulfate-adding wet-pile oxidation conversion of stone coal under atmospheric temperature and atmosphere pressure

A technology of atmospheric pressure and stone coal, applied in the field of metallurgy and chemical industry, can solve the problems of insufficient ore adaptability, low leaching rate, environmental pollution, etc., and achieve the effects of shortening leaching time, small consumption of chemicals, and reducing costs

Inactive Publication Date: 2007-12-05
刘健 +1
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Problems solved by technology

The patent number of the Jiangxi Coal Industry Science Research Institute is ZL90104669.8, and the patent name is: The patented method for extracting vanadium pentoxide from stone coal ash slag mixed with sulfuric acid, heated and ripened in water. The main technical scheme is: stone coal ash Warm curing, the leaching rate is 68%. This patented method has the disadvantages of a large amount of acid gas and sulfur dioxide gas being released during the heating and curing process of stone coal, which causes serious environmental pollution and low leaching rate.
There is also an acid leaching process for extracting vanadium in the prior art. The main technical scheme is: stone coal is leached with continuous stirring for 20 hours at 85°C, and the leaching rate is 78%. Although this process can be produced on a large scale, it still exists Disadvantages such as high energy consumption and insufficient adaptability to different types of ores

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] dry-grind the stone coal primary ore containing 0.5-3.0% by mass of vanadium to less than 60 meshes, add industrial sulfuric acid with a concentration of 70-98% by mass, the mass percentage of material acid is 100:26-35, stir evenly, and Under normal temperature and pressure, the wet pile is 4 to 15 days, and the pile height is more than 0.5 meters; under the above conditions, sulfuric acid reacts exothermicly with metal oxides such as aluminum, potassium, iron and silicate in the stone coal, A large amount of sulfate is generated, a large amount of sulfuric acid is consumed, and the concentration of sulfuric acid decreases accordingly. At the same time, the heat generated by the reaction raises the temperature of the material in the pile to above 85°C, and the water carried by the stone coal itself and the sulfuric acid diluted The added water and the water generated by the reaction evaporate, and the sulfuric acid always maintains a high concentration. Under the action...

Embodiment 2

[0028] The stone coal primary ore containing 0.5% by mass of vanadium is dry ground to 60 mesh, and industrial sulfuric acid with a concentration of 70% by mass is added, and the mass percentage of material acid is 100:26.3, stirred evenly, and wet piled at normal temperature and pressure. 15 days, the pile height is 6.0 meters; under the above conditions, sulfuric acid reacts exothermicly with metal oxides such as aluminum, potassium, iron and silicates in the stone coal, generating a large amount of sulfate and consuming a large amount of sulfuric acid , the concentration of sulfuric acid decreases accordingly, and the heat generated by the reaction raises the temperature of the material in the pile to 85°C, which evaporates the water carried by the stone coal itself, the water added during the sulfuric acid dilution process, and the water generated by the reaction. Sulfuric acid always maintains a high concentration. Under the action of this concentrated acid, high temperatu...

Embodiment 3

[0030]The percentage is 0.97% of stone coal primary ore dry grinding to 80 mesh, adding industrial sulfuric acid with concentration mass percentage of 75%, material acid mass percentage is 100:27.4, stirring evenly, under normal temperature and pressure, wet stacking for 13 days, the obtained The pile height is 2 meters; under the above conditions, sulfuric acid reacts exothermicly with aluminum, potassium, iron and other metal oxides and silicates in stone coal to generate a large amount of sulfate, consume a large amount of sulfuric acid, and the concentration of sulfuric acid At the same time, the heat generated by the reaction raises the temperature of the materials in the pile to 88°C, and evaporates the water carried by the stone coal itself, the water added during the dilution of sulfuric acid and the water generated by the reaction, and the sulfuric acid is always kept relatively high. High concentration, under the action of this concentrated acid, high temperature, wat...

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Abstract

The normal temperature and normal pressure process of leaching vanadium from stone coal includes the following steps: 1. grinding stone coal to below 60 mesh; 2. adding 70-98 wt% concentration sulfuric acid solution in the material / acid weight ratio of 100 to 26-35 via stirring; 3. piling the mixture in the height greater than 0.5 m at normal temperature and normal pressure for 4-15 days; 4. exothermic reaction inside the pile to complete the oxidation of vanadium inside stone coal with oxygen in the air at temperature over 85 deg.c; and 5. adding water in 1-3 times the solid at normal temperature and normal pressure, and stirring for 3-8 hr to leach out vanadium in 65-97.7 %. The process of leaching out vanadium from stone coal is wide applicable for original stone coal ore and oxidized stone coal ore.

Description

technical field [0001] The invention relates to a method for extracting vanadium in the field of metallurgy and chemical industry, in particular to a method for leaching vanadium by wet stack oxidation conversion of stone coal and sulfuric acid under normal temperature and pressure. Background technique [0002] Vanadium and its compounds are widely used in metallurgy, aerospace, chemical and other industrial sectors. Vanadium can improve the strength, toughness, ductility and heat resistance of steel. Metal vanadium can also be used in magnetic materials, cast iron, hard alloys, superconducting materials and In the field of nuclear reactor materials and other fields, vanadium pentoxide and vanadium compounds are mainly used as colorants in the glass and ceramic industries, sulfuric acid and catalysts for petrochemical production. Vanadium catalysts have special activity and cannot be replaced by other elements. With the rapid development of metallurgy and chemical industry,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/08C22B1/14C22B3/44
CPCY02P10/20
Inventor 刘健李纯青
Owner 刘健
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