發(fā)布時(shí)間：2018-03-29 08:16

  本文選題：濕法還原　切入點(diǎn)：脫硫　出處：《昆明理工大學(xué)》2017年碩士論文

【摘要】：高硫鋁土礦中的硫以不同價(jià)態(tài)硫的形式進(jìn)入鋁酸鈉溶液,給工業(yè)生產(chǎn)造成不同危害。因此,研究高硫鋁土礦中含硫礦物的溶出以及不同價(jià)態(tài)硫的脫除,對我國高硫鋁土礦的有效利用具有重要現(xiàn)實(shí)意義。本文分別從理論和實(shí)驗(yàn)對高硫鋁土礦溶出行為和濕法還原脫硫進(jìn)行研究。對高硫鋁土礦中不同形態(tài)硫溶出及不同還原劑還原高價(jià)硫進(jìn)行熱力學(xué)計(jì)算和理論分析。通過對富含黃鐵礦和石膏的兩種高硫鋁土礦進(jìn)行溶出實(shí)驗(yàn),明晰了高硫鋁土礦溶出行為。通過濕法還原脫硫?qū)嶒?yàn),分析對比了幾種不同還原劑還原脫硫能力,并明確了最佳濕法還原脫硫的條件和效果。論文的主要研究結(jié)果如下:(1)分別確定了富含黃鐵礦(A礦)和石膏(B礦)的兩種高硫鋁土礦的最佳溶出條件。A礦最佳溶出條件:CaO含量0%,溶出溫度260 ℃,溶出60 min,在此條件下,氧化鋁溶出率為86.13%,硫溶出率達(dá)到48.97%;B礦最佳溶出條件:CaO含量12%,溶出60min,溶出溫度260 ℃,在此條件下,氧化鋁溶出率為79.41%,硫溶出率達(dá)到40.25%。(2)理論分析表明298～573 K下,以還原S2032-為標(biāo)準(zhǔn),還原高價(jià)硫能力順序?yàn)?AlFeCZn;實(shí)驗(yàn)結(jié)果顯示,四種還原劑均能夠還原S2O32-,降低S2O32-濃度,得到還原能力順序?yàn)?AlZnFeC。鋁片、鋅粒和活性炭均能夠提高氧化鋁溶出率,鐵粉對其影響較小,但鋁片和鐵粉不能夠脫硫,活性炭和鋅粒能夠脫硫,從而鋅粒和活性炭為最佳還原脫硫劑。(3)選擇活性炭為最佳還原脫硫劑時(shí),最佳溶出條件為:CaO含量12%,活性炭添加量15%,溶出溫度260℃,溶出時(shí)間60 min,在此條件下氧化鋁溶出率可達(dá)到78.45%,同比升高10.63%,硫溶出率達(dá)到39.16%,同比下降20.70%。鋅粒能夠還原脫硫,在鋅粒添加量20%,溶出溫度260 ℃,溶出時(shí)間60 min下,氧化鋁溶出率為81.26%,同比升高11.48%,硫溶出率為54.14%,同比下降10.24%。添加活性碳提高高硫鋁土礦溶出性能更明顯。
[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，

本文編號：1680298