A method for vanadium-containing stone coal decarburization-crystal breaking roasting enhanced acid leaching vanadium extraction

Abstract

A method for vanadium-containing stone coal decarburization-crystal-breaking roasting enhanced acid leaching vanadium extraction, which is carried out as follows: (1) crushing and grinding the vanadium-containing stone coal block to make stone coal ore powder; (2) hot flue gas Pass into the suspension roasting device; the coal powder is transported to the suspension roasting device, suspended by the high-temperature air flow, and discharged after heat storage and roasting at 700-900 °C; (3) transported to the decarbonization roasting device, and air is introduced to make the heat storage stone coal powder Suspended, decarburized and roasted at 500-800°C, and the decarbonized material is discharged; (4) Air and nitrogen mixed gas is introduced into the crystal-breaking roasting device, and the decarburized material is transported to the crystal-breaking roasting device for suspension, and oxidized at 750-900 °C, Discharge of crystal-breaking and roasting materials; (5) Carry out acid leaching in sulfuric acid solution to extract vanadium. The invention has the advantages of simple technological process, uniform product properties, large equipment processing capacity, high efficiency, energy saving and environmental protection, and easy realization of large-scale.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal. Specifically, it relates to a method for vanadium-containing stone coal decarburization-crystal-breaking roasting and enhanced acid leaching for vanadium extraction. Background technique [0002] As an important strategic substance, vanadium is widely used in various industries. With the development of iron and steel industry, the consumption of vanadium as an important additive continues to increase, which makes vanadium resources increasingly tight. As an important vanadium-containing resource, stone coal has huge reserves. Due to the complex and changeable mineral composition in stone coal, the occurrence states of vanadium in stone coal are different, which has also led to the fact that vanadium-containing stone coal has not yet Efficient utilization; therefore, how to realize the effective extraction of vanadium resources in stone coal is of great significance to ...

AI Technical Summary

Problems solved by technology

As an important vanadium-containing resource, stone coal has huge reserves. Due to the complex and changeable mineral composition in stone coal, the occurrence states of vanadium in stone coal are different, which has also led to the fact that vanadium-containing stone coal has not yet Efficient utilization; therefore, how to realize the effective extraction of vanadium resources in stone coal is of great significance to alleviate the shortage of vanadium resources in my country

[0003] Patent CN 103952538 A relates to a roasting method for stone coal vanadium ore raising material, adjusting air and supplementing heat. It is proposed to add material raising, air supplementing and heat supplementing devices to the conventional rotary kiln to improve the roasting effect of stone coal, but the rotary kiln still exists Disadvantages such as easy under-burning or over-burning, low energy utilization rate and need to mix bituminous coal

Patent CN 103276195 A relates to a shaft furnace roasting method and system for stone coal and vanadium ore. It is proposed to mix vanadium-containing stone coal and sodium peroxide into the shaft furnace for roasting, which can achieve the oxidation effect to a certain extent, but there are still balls Disadvantages such as poor oxidation uniformity of the inner and outer layers of the pellet, sulfur pollution in the tail gas, etc.

Patent CN 106282538 A relates to a method for preparing high-purity vanadium pentoxide by one-step method from stone coal. Fluidized fluidized furnace can optimize the roasting effect to a certain extent and improve the conversion rate of vanadium, but it needs to adopt the roasting method of intermittent feeding and gradual heating. There are disadvantages such as small processing capacity and difficulty in industrial application

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