石煤提钒环保型新工艺研究VIP免费

攀枝花学院本科毕业设计（论文）石煤提钒环保型新工艺研究学生姓名： 李振江 学生学号： 200310519097 院（系）： 材料工程系 年级专业： 2003 级材料科学与工程 指导教师： 王金超 高级工程师 助理指导教师：黄守华 高级工程师 二〇〇七年六月摘 要我国大多数石煤提钒厂都采用“钠化焙烧—水浸—酸沉粗钒—碱溶—偏钒酸铵沉钒”这一传统工艺流程。由于食盐作为钠化焙烧的添加剂，优于其他钠盐，而被广泛的应用。但是，由于其分解产生的氯气和氯化氢气体，严重影响生态平衡和生存环境[1]。研究一种环保型新工艺，是本次毕业设计试验的主要目的。本文针对钠盐焙烧会产生有毒有害气体，而选用加氧化钙的办法进行氧化钙化焙烧，同时废水在系统内循环，达到无废水或只有少量废水排放的环保型新工艺。通过试验，得到下列结果：当石煤与氧化钙的比为 100：8 时，焙烧温度 950℃，焙烧时间 4h，浸出温度 85℃，浸出时间 3h，wt10%H2SO4介质，钒转浸率为 50%～51%之间。全流程钒的总收率在 44%～45%之间。关键词 钙化焙烧，酸浸，萃取-反萃，沉钒ABSTRACTMost of our coal stone vanadium plant "Na-baking-flooding-acid crude vanadium-alkali - NH4VO3 Shen V" - EC process[2 ～ 3]. Because as a sodium salt of baking additives other than sodium, which were widely used. However, due to the decomposition of chlorine and hydrogen chloride gas, seriously affecting the ecological balance and survival of the environment. Research a new type of environmental technology, is the graduation of the main design goal.This paper will produce sodium baking poisonous gases, and use of calcium oxide and calcium oxide approach to roasting, The wastewater recycling within the system to achieve no or only a small amount of wastewater effluent discharge new environmental protection technology. Through testing, results were as follows : When the stone coal and calcium oxide compared to the 100 : 8, the calcination temperature 950, 4 hours roasting time, leaching temperature is 85, leaching time 3h, wt10%℃℃ H2SO...