Cleaner production process for synchronously extracting vanadium and aluminum from aluminothermic vanadium iron slag
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A technology for simultaneous extraction of ferrovanadium slag, applied in the field of metallurgy, can solve the problems of low recovery rate of vanadium, failure of resource utilization of aluminum, etc., and achieve the effects of significant economic and environmental benefits, reduction of carbon emission ratio, and high-efficiency extraction.
Active Publication Date: 2012-07-18
HEBEI IRON AND STEEL
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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,
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Embodiment 1
[0012] Embodiment 1, a clean production process for synchronously extracting vanadium and aluminum from the aluminothermic ferrovanadium slag, comprising the following steps:
[0013] (1) Crushing and ball milling the iron-vanadium slag to make the particle size below -120 mesh;
[0014] (2) Ingredients: Na 2 CO 3 Mix with ferrovanadium slag in a ratio of 1:1 by weight, and stir evenly;
[0015] (3) Roasting: Roast the mixed material at a temperature of 900°C for 4 hours;
[0016] (4) Leaching: Put the clinker into the leaching solution, leaching at the leaching temperature of 80°C, the leaching time is 30min, the liquid-solid ratio is 1.5:1, and the alkalinity of the leaching solution is 260.5g / L. The leaching rate of vanadium pentoxide is 89.1%, the leaching rate of aluminum is 69.3%, the concentration of aluminum in the leach solution is 102.3g / L, and the concentration of vanadium is 9.26g / L;
[0017] (5) Washing: the filtered filter cake is washed with water at 80°C; ...
Embodiment 2
[0021] Embodiment 2, a clean production process for synchronously extracting vanadium and aluminum from the aluminothermic ferrovanadium slag, comprises the following steps:
[0022] (1) Crushing and ball milling the iron-vanadium slag to make the particle size below -120 mesh;
[0023] (2) Ingredients: add Na 2 CO 3 Mix with the return liquid (carbon mother liquid) vanadium iron slag of the previous reaction in a ratio of 1:1.0 by weight;
[0024] (3) Roasting: Roast the mixed material at a temperature of 900°C for 5 hours;
[0025] (4) Leaching: Put the clinker into the leaching solution (the tailings washing solution and the aluminum hydroxide washing solution from the last reaction), leaching at the leaching temperature of 80°C, the leaching time is 30min, and the liquid-solid ratio is 2:1. The alkalinity of the leach solution is 281.5g / L. The vanadium leaching rate is 87.6%, and the aluminum leaching rate is 72.5%. The leachate contains 113.6g / L aluminum and 11.65g / L...
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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 synchronously extracting vanadium and aluminum from aluminothermic vanadium-iron slag, belonging to the technical field of metallurgy. Background technique [0002] At present, the production of ferrovanadium mostly adopts the aluminothermic reduction method, and a large amount of ferrovanadium slag will be produced in the production process. The annual output of ferrovanadium slag by aluminothermic method is more than 15000t in my country. The slag contains 65-85% alumina and 1.3%-4% vanadium pentoxide. Since the vanadium-iron slag is formed at a high temperature of nearly 2000°C, the crystallization is dense, and the composition is complex, the composition of the vanadium-iron slag fluctuates greatly. For example: Al in the 80 vanadium iron slag produced by Panhong Company 2 o 3 At 78-83%, CaO at 10-17%, MgO at 1.0-2.5%, its main phase composition is CA(CaO Al 2 o 3 ), CA 6 (CaO 6 Al 2 o ...
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