磷石膏处理方案综合评价研究

发布时间：2018-05-05 01:34

本文选题：磷石膏 + 处理方案　；参考：《西南交通大学》2015年硕士论文

【摘要】：随着我国磷肥工业的持续发展,磷石膏排放量也随之增加,而以堆存为主的处理方式不仅占用大量土地,对区域环境也造成了严重污染,同时对周边居民也有着潜在的危害,如何妥善处理磷石膏已成为亟需解决的重要问题。大量实验研究与工程实践表明,磷石膏是一种可回收利用的资源,目前磷石膏的综合处理方式种类繁多,如制作石膏砌块、水泥缓凝剂、土壤改良剂等,但磷石膏特性不一,区域环境不同,其适宜的处理方案也有所差异,因此如何科学有效的选择磷石膏处理方案,对于促进磷石膏的资源化利用,推动资源节约型社会的发展具有重大意义。针对此问题,本文在总结磷石膏污染特性及其处理方案的基础上,应用改进层次分析法确定了磷石膏处理方案评价指标的权重,结合模糊综合评价方法,构建了综合评价磷石膏处理方案的指标体系,分别评价了三个磷石膏堆场不同处理方案的处理效果,并得出了最优处理方案。结果表明,采用G1法得到准则层中环境效益的权重最大(其值为0.3892),社会效益的权重最小(其值为0.1351)；指标层中二次污染控制能力、磷石膏利用率、二次固废量、产品收益的综合权重较大,分别为0.1577、0.1103、0.1213和0.1124；增加就业岗位、社会认可度的综合权重较小,分别为0.0384和0.0461。论文构建的磷石膏综合评价指标体系包含三个层次共12个指标,评价表明制硫酸联产水泥、制石膏粉及石膏砌块、制水泥缓凝剂处理方案应用于堆场一的综合评价得分分别为6.41691分、7.6700分、7.0355分,因而制石膏粉及石膏砌块为堆场一的最适宜处理方案;3种处理方案应用于堆场二的综合评价得分分别为6.0089分、6.7297分、7.1223分,3种处理方案应用于堆场三的综合评价得分分别为5.4842分、5.9985分、7.1353分,故制水泥缓凝剂为堆场二、三的最适宜处理方案。
[Abstract]:With the sustainable development of phosphate fertilizer industry in China, phosphogypsum emissions are also increasing, and the stowage treatment not only occupies a lot of land, but also causes serious pollution to the regional environment, and also has potential harm to the surrounding residents. How to deal with phosphogypsum properly has become an important problem that needs to be solved. A large number of experimental studies and engineering practices show that phosphogypsum is a kind of resources that can be recycled. At present, there are many kinds of comprehensive treatment methods of phosphogypsum, such as making gypsum block, cement retarder, soil improver, etc., but the characteristics of phosphogypsum are different. Therefore, how to choose phosphogypsum treatment scheme scientifically and effectively is of great significance to promote the utilization of phosphogypsum and promote the development of resource-saving society. In order to solve this problem, on the basis of summing up the pollution characteristics of phosphogypsum and its treatment scheme, the weight of evaluation index of phosphogypsum treatment scheme is determined by using improved analytic hierarchy process (AHP) and combined with fuzzy comprehensive evaluation method. The index system of comprehensive evaluation of phosphogypsum treatment scheme was constructed, and the treatment effect of three different treatment schemes of phosphogypsum dump was evaluated, and the optimal treatment scheme was obtained. The results show that the weight of environmental benefit in the criterion layer is the largest (its value is 0.3892), the weight of social benefit is the least (its value is 0.1351), the secondary pollution control ability, the utilization rate of phosphogypsum and the amount of secondary solid waste are obtained by using G1 method. The comprehensive weight of product income is larger, 0.1577-0.103, 0.1213 and 0.1124respectively, and the comprehensive weight of social recognition is smaller, which is 0.0384 and 0.0461respectively. The comprehensive evaluation index system of phosphogypsum consists of 12 indexes at three levels. The evaluation shows that sulfuric acid co-production cement, gypsum powder and gypsum block are produced. The comprehensive evaluation scores of cement retarder treatment scheme applied to yard 1 are 6.41691, 7.6700, 7.0355respectively. Therefore, the most suitable treatment scheme of making gypsum powder and gypsum block is yard one. The comprehensive evaluation scores of three treatment schemes applied to yard 2 are 6.0089, 6.7297, 7.1223 and 7.1223 respectively, and the comprehensive evaluation scores of three treatment schemes applied to yard 3 are 6.0089, 6.7297 and 7.1223 respectively. The scores were 5.4842, 5.9985, 7.1353, respectively. Therefore, the cement retarder is the most suitable treatment scheme for yard two and three.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177.375

【相似文献】