高硫铝土矿湿法还原脱硫的基础研究

发布时间：2018-03-29 08:16

  本文选题：湿法还原　切入点：脱硫　出处：《昆明理工大学》2017年硕士论文

【摘要】：高硫铝土矿中的硫以不同价态硫的形式进入铝酸钠溶液,给工业生产造成不同危害。因此,研究高硫铝土矿中含硫矿物的溶出以及不同价态硫的脱除,对我国高硫铝土矿的有效利用具有重要现实意义。本文分别从理论和实验对高硫铝土矿溶出行为和湿法还原脱硫进行研究。对高硫铝土矿中不同形态硫溶出及不同还原剂还原高价硫进行热力学计算和理论分析。通过对富含黄铁矿和石膏的两种高硫铝土矿进行溶出实验,明晰了高硫铝土矿溶出行为。通过湿法还原脱硫实验,分析对比了几种不同还原剂还原脱硫能力,并明确了最佳湿法还原脱硫的条件和效果。论文的主要研究结果如下:(1)分别确定了富含黄铁矿(A矿)和石膏(B矿)的两种高硫铝土矿的最佳溶出条件。A矿最佳溶出条件:CaO含量0%,溶出温度260 ℃,溶出60 min,在此条件下,氧化铝溶出率为86.13%,硫溶出率达到48.97%;B矿最佳溶出条件:CaO含量12%,溶出60min,溶出温度260 ℃,在此条件下,氧化铝溶出率为79.41%,硫溶出率达到40.25%。(2)理论分析表明298～573 K下,以还原S2032-为标准,还原高价硫能力顺序为:AlFeCZn;实验结果显示,四种还原剂均能够还原S2O32-,降低S2O32-浓度,得到还原能力顺序为:AlZnFeC。铝片、锌粒和活性炭均能够提高氧化铝溶出率,铁粉对其影响较小,但铝片和铁粉不能够脱硫,活性炭和锌粒能够脱硫,从而锌粒和活性炭为最佳还原脱硫剂。(3)选择活性炭为最佳还原脱硫剂时,最佳溶出条件为:CaO含量12%,活性炭添加量15%,溶出温度260℃,溶出时间60 min,在此条件下氧化铝溶出率可达到78.45%,同比升高10.63%,硫溶出率达到39.16%,同比下降20.70%。锌粒能够还原脱硫,在锌粒添加量20%,溶出温度260 ℃,溶出时间60 min下,氧化铝溶出率为81.26%,同比升高11.48%,硫溶出率为54.14%,同比下降10.24%。添加活性碳提高高硫铝土矿溶出性能更明显。
[Abstract]:The sulfur in high-sulfur bauxite is entered into sodium aluminate solution in the form of different valence sulfur, which causes different harm to industrial production. Therefore, the dissolution of sulfur-bearing minerals and the removal of sulfur from high-sulfur bauxite are studied. It is of great practical significance for the effective utilization of high-sulfur bauxite in China. In this paper, the dissolution behavior of high-sulfur bauxite and wet reduction desulphurization of high-sulfur bauxite are studied in theory and experiment. The thermodynamic calculation and theoretical analysis of reducing high sulfur with reductant were carried out. The dissolution experiments of two kinds of high sulfur bauxite containing pyrite and gypsum were carried out. The dissolution behavior of high-sulfur bauxite is clarified. Through wet reduction desulfurization experiment, several kinds of reductant reducing desulfurization ability are analyzed and compared. The main results of this paper are as follows: (1) the optimum dissolution conditions of two kinds of high sulfur bauxite containing pyrite (A) and gypsum (B) are determined respectively. The content of Cao is 0, the dissolution temperature is 260 鈩，

本文编号：1680298