摘要:
模拟某钒厂沉钒工艺分别用工业硫酸和烟气硫酸沉钒,以钒损和成本均最低的结果为依据进行探索试验。选取其中钒损和成本低的一组试验,优化其工艺参数。试验结果表明,一步沉钒法烟气硫酸沉钒钒损最小,成本最低。其最优沉钒工艺参数:加沉钒剂后调节pH值为2.2,99℃至沸腾沉钒1 h,以每吨V2O3计,钒损为3.06 kg,成本763.18元,远低于工业硫酸沉钒成本。该技术应用于工业生产后,沉钒上层液钒含量均值为0.31 g/L,完全满足生产要求。其最终产品V2O3质量、粒度分布及堆比重均与工业硫酸沉钒水平相当。
关键词:
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V2O3 /
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沉钒 /
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工业硫酸 /
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烟气硫酸 /
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钒损
Abstract:
The exploratory experiments of precipitating vanadium which simulated the process conditions in a vanadium plant with the indexes of vanadium loss and cost were respectively tested with industrial sulfuric acid and flue-gas sulfuric acid in laboratory.The technology optimizations were studied by selecting the experimental group with the lowest vanadium loss and cost.The results indicate that the vanadium loss and cost are the lowest by one-step vanadium precipitation with flue-gas sulfuric acid,and the optimum processes are as follows:the pH of vanadium-containing solution is adjusted to 2.2 after adding the precipitation agent and the precipitation is proceeded 1 hour at 99℃ or 100℃.The vanadium loss and cost per 1 000 kg V2O3 are respectively 3.06 kg and 763.18 RMB yuan by the optimum processes,which are much less than the processes with industrial sulfuric acid.The new technology,which has been applied to industry,can wholly satisfy the production requirements with 0.31 g/L vanadium in the upper-liquor of precipitating vanadium process.Meanwhile,the purity,size distribution and bulk density of the final product V2O3 by the new technology are at the same level as those of the V2O3 by vanadium precipitation with industrial sulfuric acid.