锰矿酸浸渣稳定化工艺技术研究

发布时间：2018-06-21 19:36

本文选题：锰矿酸浸渣 + 可溶锰　；参考：《广西大学》2015年硕士论文

【摘要】：锰矿酸浸渣(简称锰渣)是指采用硫酸浸出锰矿过程中所产生的废弃物,一般只采取简易堆放或简单填埋的处置方法。近年来,由于我国锰产业的发展,富锰矿资源已接近枯竭,大多数工厂不得不使用低品位锰矿进行生产,产生的锰渣不断增多,所造成的环境问题日益凸显。因此,研究锰渣稳定化处理工艺,不仅可以消除环境污染隐患,而且为锰行业可持续发展提供了一种新的思路。本文使用广西某锰产品生产企业的锰渣,首先对其理化性质进行分析。结果表明,实验使用的锰渣pH值在6.5左右,显弱酸性,锰渣中总锰含量为6.08%,其中可溶锰含量约占总锰的25%左右,碳酸锰含锰量为3.39%。浸出毒性检测结果表明,锰渣浸出液中可溶锰离子的浓度为378.0 mg/L,是GB8978-1996《污水综合排放标准》最高允许排放浓度标准(2.00 mg/L)的189倍。因此,可溶锰是锰渣中主要的污染物质。在锰渣稳定化实验研究中,分别探索了采用氧化钙、硅酸钠和磷酸钠处理锰矿酸浸渣的工艺。结果表明：(1)使用经干燥后的锰渣20.00 g,氧化钙加入量为1.50 g,用水调至锰渣含水率为100%,在不通风无日照的条件下放置0.5 h,浸出毒性测试可溶锰浓度为1.22 mg/L。(2)使用经干燥后的锰渣20.00 g,硅酸钠加入量为0.50 g,调节物料液固比5：1,pH 8.0,在搅拌速度250 r/min,30 ℃条件下反应15 min,可溶锰固化率为97.11%,浸出毒性测试可溶锰浓度为1.12 mg/L。(3)使用经干燥后的锰渣20.00 g,磷酸钠加入量为1.25 g,调节物料液固比6：1,pH 8.0,在搅拌速度200 r/min,30℃条件下反应15 min,可溶锰固化率为95.83%,浸出毒性测试可溶锰浓度为1.42 mg/L。以上三种处理方式,可溶锰浓度均低于国家标准。此外,本文采用XRD、SEM和化学分析等测试分析手段对稳定剂在锰渣中的固锰机理进行了初步探讨。结果表明,稳定剂和可溶锰离子发生反应生成硅酸盐、磷酸盐等难溶物以及形成的胶凝现象是可溶性锰减少的主要原因,空气中的氧气和氢氧化锰反应产生的Mn02等锰化合物也对可溶锰离子的稳定化有一定的作用。
[Abstract]:Manganese ore acid leaching residue (manganese slag) refers to the waste produced in the process of leaching manganese ore by sulfuric acid. In general, only simple or simple disposal methods are adopted. In recent years, because of the development of the manganese industry in China, the manganese ore resources have been nearly exhausted, and most of the factories must not use low grade manganese ore for production. In addition, the environmental problems are becoming increasingly prominent. Therefore, the study of manganese slag stabilization treatment process can not only eliminate the hidden dangers of environmental pollution, but also provide a new way of thinking for the sustainable development of manganese industry. In this paper, the physical and chemical properties of manganese residue in a manganese product production enterprise in Guangxi are analyzed. The results show that the experiment is used. The pH value of manganese slag is about 6.5, showing weak acidity, the total manganese content in manganese slag is 6.08%, and the soluble manganese content is about 25% of the total manganese. The manganese content of manganese carbonate is 3.39%. leaching toxicity test results show that the concentration of soluble manganese ion in the leaching solution of manganese slag is 378 mg/L, which is the comprehensive emission standard of GB8978-1996< sewage and the highest permissible discharge standard. It is 189 times of (2 mg/L). Therefore, soluble manganese is the main pollution substance in manganese slag. In the experimental study on the stabilization of manganese slag, the process of using calcium oxide, sodium silicate and sodium phosphate to treat manganese leaching residue was explored. The results showed that (1) the use of dried manganese slag 20 g and calcium oxide added to 1.50 g, the water content of manganese slag was adjusted to the water content of manganese slag. For 100%, 0.5 h was placed under the condition of non ventilation and no sunshine. The leaching toxicity test of soluble manganese concentration was 1.22 mg/L. (2) using the dried manganese slag 20 g, the sodium silicate added to 0.50 g, the liquid solid ratio 5:1, pH 8, at the stirring speed 250 r/min, 30 temperature reaction 15 min, the soluble manganese curing rate was 97.11%, leaching toxicity test The soluble manganese concentration is 1.12 mg/L. (3) using the dried manganese slag 20 g, the sodium phosphate added to 1.25 g, the material liquid solid ratio 6:1, pH 8, the stirring speed 200 r/min, 30 centigrade reaction 15 min, the soluble manganese curing rate is 95.83%, the leaching toxicity test manganese concentration is 1.42 mg/L. above 1.42 mg/L., the soluble manganese concentration is all In addition, the mechanism of manganese fixation in manganese residue was preliminarily discussed by means of XRD, SEM and chemical analysis. The results showed that the reaction of stabilizers and soluble manganese ions produced silicate, phosphate and other difficult insoluble substances and the formation of gelation were the main reasons for the reduction of soluble manganese. The Mn02 and other manganese compounds produced by the reaction of oxygen in the gas and manganese hydroxide also play a certain role in stabilizing the soluble manganese ions.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X757

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