Process for extracting vanadium through alkaline leaching conducted after stone coal oxidizing roasting

Abstract

The invention relates to a process for extracting vanadium through alkaline leaching conducted after stone coal oxidizing roasting, and belongs to the technical field of metallurgy and chemical industry. The process is characterized by including the steps of firstly, grinding stone coal ore till the 200-mesh particles accounts for about 80% of the total amount, adding water to form balls, and conducting high-temperature roasting in a flat kiln; secondly, using NaOH and sodium carbonate to conduct leaching together in the vanadium leaching process, and conducting leaching for three hours at the temperature lower than 95 DEG C, wherein the massic volume ratio of stone coal roasted product to leaching liquid is 1g/ml to 3g/ml, the additive amount of the NaOH is 40g/L, and the additive amount of the sodium carbonate is 13.5g/L; thirdly, enabling the stone coal to enter a purifying pool after primary leaching and washing are conducted so that the solid-liquid separation can be achieved, stacking and storing the stone coal balls, enabling lixivium to directly flow back to be used for leaching vanadium of newly added stone coal, adding leaching agents to the secondary lixivium according to the proportion of the NaOH to the leaching liquid, namely, 13.5g/L and the proportion of the sodium carbonate to the leaching liquid, namely, 4.5g/L, and enabling the product to flow back to be used for leaching vanadium of stone coal balls which are added for the third time. The process has the advantages of being small in pollution, high in vanadium extraction rate, few in heavy metal impurities produced in the leaching process, small in water consumption and the like, and has certain economic benefits under the present technical condition.

Description

technical field [0001] The invention relates to a process for vanadium extraction by alkali leaching after oxidation and roasting of stone coal. Specifically, it relates to a vanadium leaching process in which NaOH and soda ash composite alkali leaching and leaching liquid are recycled, and belongs to the technical field of metallurgy and chemical industry. Background technique [0002] Vanadium is an important metal widely used in metallurgy, aerospace, electronics, chemical industry, medicine and other fields, and is an important chemical product in my country. Under the current technical conditions, the vanadium ore resources that can be mined and utilized mainly include vanadium-titanium magnetite and stone coal. V in stone coal 2 o 5 The content is generally 0.13 to 1.2%. Vanadium in stone coal mainly exists in acid-base insoluble trivalent vanadium V(Ⅲ) and tetravalent vanadium V(Ⅳ), and V(Ⅲ) accounts for the vast majority. The key to extracting vanadium from ston...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the technical deficiencies such as low vanadium leaching rate, serious air pollution, and large water resource consumption in the process of extracting vanadium from stone coal, and provide a leaching agent with high vanadium leaching rate and less pollution. Vanadium Leaching Process with Less Water Consumption

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