Cleaner production process for synchronously extracting vanadium and aluminum from aluminothermic vanadium iron slag

Abstract

The invention relates to a cleaner production process for synchronously extracting vanadium and aluminum from aluminothermic vanadium iron slag, and belongs to the technical field of metallurgy. The technical scheme is that: the vanadium iron slag is subjected to sodium oxide roasting by using high-proportion Na2CO3 as a roasting transforming agent, vanadium and aluminum of a clinker obtained after sodium oxide roasting are synchronously dissolved out by using an aqueous solution, sodium vanadate crystals containing aluminum hydroxide are crystallized, the purity of the obtained Al(OH)3 is over 95 percent, the purity of vanadium pentoxide is over 98 percent, the co-extraction of the vanadium and the aluminum, the separation of the vanadium and the aluminum and the cyclic utilization of sodium salt are realized, the recovery rate of the vanadium is over 85 percent, the recovery rate of the aluminum is over 60 percent, the weight of tailings is reduced by 40 to 50 percent after leaching, and the tailings can be used for preparing an aluminum-magnesium flocculant by an acid method. The high-efficiency extraction of the vanadium is realized, the resource reutilization of an aluminum element in the slag is also realized, wastewater discharge is avoided in the whole production process, CO2 gas for carbonation can be replaced by roasting flue gas, the proportion of carbon emission isreduced, and the process has remarkable economic and environmental benefits, and can be effectively applied to the treatment of the aluminothermic vanadium iron slag and related materials.

Description

Technical field [0001] The invention relates to a clean production process for simultaneously extracting vanadium and aluminum from ferrovanadium slag of thermite method, and belongs to the field of metallurgical technology. Background technique [0002] At present, most ferrovanadium production uses the thermite reduction method, which produces a large amount of ferrovanadium slag. The annual output of ferrovanadium slag from the thermite method in my country is more than 15,000 tons. The slag contains 65-85% alumina and 1.3%-4% vanadium pentoxide. Since ferrovanadium slag is formed at a high temperature of nearly 2000°C, has dense crystallization and complex composition, the composition of ferrovanadium slag fluctuates greatly. For example: Al in 80 ferrovanadium slag produced by Panhong Company 2 O 3 At 78-83%, CaO at 10-17%, MgO at 1.0-2.5%, and its main phase composition is CA (CaO ·Al 2 O 3 ), CA 6 (CaO·6Al 2 O 3 ) and a small amount of corundum phase; Al in 80...

AI Technical Summary

Problems solved by technology

In the background technology, Chinese patent CN 1824607 A is a process for recovering vanadium, using sodium carbonate (6.5-7.5%) as a roasting conversion agent, and adding MgSO 4 As a conversion agent, the recovery rate of vanadium is 65-75%. Although this process can recover a part of vanadium in the slag, the recovery rate of vanadium is low, and the aluminum in the slag cannot be used as a resource.

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