含硫酸镁废水石灰乳法制备氢氧化镁工艺中的分析方法建立

发布时间：2018-06-03 05:01

本文选题：氢氧化镁 + 硫酸镁　；参考：《南京理工大学》2010年硕士论文

【摘要】： 红土镍矿制镍过程中产生含硫酸镁约10%的废水,而废水处理对制镍工艺至关重要。本课题组以硫酸镁废水为原料,采用改进的石灰乳法制氢氧化镁产品。本文研究该氢氧化镁制备工艺中的分析方法及其应用。氢氧化镁制备工艺中待分析物料可分为原料、中间产物和产品。对原料中生石灰、氯化钙的分析沿用文献方法；对原液中镁和硫酸根、中间产物中四种钙镁混液的分析,通过对取样方式和分析操作改进,完善氢氧化镁制备工艺中的分析方法；对氢氧化镁标准中缺少的硫酸根分析方法,在文献基础上建立新的方法,形成了一套适应于改进的石灰乳法含硫酸镁废液制氢氧化镁工艺的系统分析方法。进而,对整套系统分析方法进行精密度和准确度研究,对分析方法进行评价。此外,将系统分析方法应用于含硫酸镁废液制备氢氧化镁实际工艺,分别对其原料、中间产物和氢氧化镁产品进行跟踪分析,并对氢氧化镁制备工艺提出了改进建议。结果表明,整套系统分析方法分析原料、中间产物和氢氧化镁产品的标准偏差最小为0.01%,最高为0.50%,均在1%以下,相对标准偏差基本都在0.1%-2%范围内；分析方法的低、中、高浓度加标回收率最低为95%,最高为104%，均在95%-105%范围内,能满足氢氧化镁制备工艺分析的要求(精密度标准偏差1%,准确度加标回收率在90%-110%)。应用该系统方法对工艺进行跟踪分析,同一工艺两次跟踪分析结果平衡稳定,氢氧化镁产品分析结果如下：氢氧化镁98.7%-98.8%,氧化钙0.32%-0.36%,盐酸不溶物0.21%-0.23%,氯化物0.26-0.28%,硫酸根0.34%-0.35%,铁0.27%-0.30%,水分0.30%-0.33%。由此可见,整套系统分析方法能准确分析氢氧化镁制备工艺中各工艺段物料分配和走向,进而实现为含硫酸镁废水制氢氧化镁工艺中原料采购把关,为氢氧化镁制备工艺中的过程控制提供指导,为氢氧化镁产品的质量检测提供标准,为优化含硫酸镁废液制备氢氧化镁工艺提供参考建议的目的。
[Abstract]:About 10% of waste water containing magnesium sulfate is produced during nickel production from laterite nickel ore, and wastewater treatment is very important to nickel production process. Using magnesium sulfate wastewater as raw material, the modified lime milk was used to produce magnesium hydroxide. In this paper, the analytical method and its application in the preparation of magnesium hydroxide are studied. The materials to be analyzed in the preparation of magnesium hydroxide can be divided into raw materials, intermediate products and products. The methods used in the analysis of quicklime and calcium chloride in raw materials were followed, and the analysis of four kinds of calcium and magnesium mixtures in raw solution, magnesium and sulfate, intermediate products were improved by sampling method and analysis operation. To perfect the analytical method in the preparation process of magnesium hydroxide, to establish a new method for the analysis of sulfate radical in the magnesium hydroxide standard, A systematic analysis method of magnesium hydroxide from waste liquid containing magnesium sulfate was developed. Then, the precision and accuracy of the whole system analysis method are studied, and the analytical method is evaluated. In addition, the systematic analysis method was applied to the practical process of preparing magnesium hydroxide from waste liquid containing magnesium sulfate. The raw materials, intermediate products and magnesium hydroxide products were tracked and analyzed respectively, and some suggestions for improving the preparation process of magnesium hydroxide were put forward. The results show that the minimum standard deviation of the whole system analysis method for raw materials, intermediate products and magnesium hydroxide products is 0.01 and the maximum is 0.500.50. the relative standard deviations are basically within the range of 0.1-2%. The recoveries of high concentration and high concentration were 95% and 104% respectively, which were within the range of 95% -105%, and could meet the requirements of preparation process analysis of magnesium hydroxide (precision standard deviation 1, accuracy recovery 90 -110 0). The results were as follows: magnesium hydroxide 98.7- 98.8, calcium 0.32-0.36x, hydrochloric acid insoluble 0.21-0.23, chloride 0.26-0.28, sulfate 0.34 -0.35, iron 0.27-0.30, moisture 0.30-0.33. The results were as follows: magnesium hydroxide 98.7-98.8, calcium 0.32 -0.36, hydrochloric acid 0.21 -0.23, chloride 0.26-0.28, sulphate 0.34 -0.35, iron 0.27 -0.30, moisture 0.30 -0.33. Thus, it can be seen that the whole system analysis method can accurately analyze the distribution and trend of materials in the preparation process of magnesium hydroxide, and then realize the control of raw material purchasing for magnesium hydroxide production from magnesium sulfate wastewater. It provides guidance for the process control of magnesium hydroxide preparation process, provides the standard for the quality detection of magnesium hydroxide products, and provides reference suggestions for optimizing the process of magnesium hydroxide preparation from magnesium sulfate waste liquid.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TQ132.2

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