高硫精矿弱氧焙烧制酸技术研究

发布时间：2018-03-31 08:23

本文选题：高硫精矿　切入点：弱氧焙烧　出处：《中国科学院大学(中国科学院过程工程研究所)》2017年硕士论文

【摘要】：低品位硫铁矿焙烧制酸过程中产生的低铁硫酸烧渣堆放量逐年增加,一方面占用大量土地资源,造成环境的污染和资源的极大浪费,另一方面低品位硫铁矿制酸余热无法被充分利用。针对上述问题,为了高效利用矿产资源,提高企业的经济社会效益,需采用高硫精矿替代低品位硫铁矿实现焙烧制酸的技术路线。本文为解决高硫精矿替代低品位硫铁矿焙烧制酸的技术难题,开展了高硫精矿弱氧焙烧制酸技术的小型试验研究和工艺装置的优化。本论文通过小型试验,重点研究了沸腾层温度、烟气停留时间、炉底压力等参数对渣残硫的影响,研究了入炉矿硫品位、沸腾炉出口氧浓、沸腾炉出口负压等参数对烧渣铁含量和铁价态的影响,得到了优化的工艺参数,确立了高硫精矿弱氧焙烧制酸工艺。在小型试验的基础上,对80kt/a低品位硫铁矿制酸系统进行焙烧强度、沸腾炉后室排渣口、沸腾炉布风系统、沸腾炉下料方式、排渣系统、产酸系统的集成优化,满足了高硫矿焙烧制酸的系统要求,生产效率和产品质量明显提升。优化后的系统适合于高硫精矿弱氧焙烧制酸新工艺,设备运行稳定,开车率99.6%。产酸量(折100%)245t/d,达到GB/T534-2002 一等品标准。铁精粉产量110t/d,可直接外销,渣残硫0.28%,铁品位62.2%。
[Abstract]:The amount of low-iron sulphuric acid cinder produced in the process of producing acid from low-grade pyrite roasting increases year by year. On the one hand, it occupies a large number of land resources, resulting in environmental pollution and great waste of resources. On the other hand, the waste heat of making acid from low-grade pyrite can not be fully utilized. In order to efficiently utilize mineral resources and improve the economic and social benefits of enterprises, It is necessary to use high sulfur concentrate instead of low grade pyrite to realize acid production by roasting. In order to solve the technical problem of high sulfur concentrate replacing low grade pyrite roasting to produce acid, In this paper, the effects of temperature of boiling layer, residence time of flue gas and bottom pressure of furnace on residual sulfur in slag were studied. The effects of sulfur grade, oxygen concentration at the outlet of fluidized bed furnace and negative pressure at the outlet of fluidized bed furnace on iron content and iron valence state of slag were studied, and the optimized process parameters were obtained. On the basis of small scale experiments, the 80kt/a low grade pyrite acid making system was roasted, the slag outlet of the chamber after fluidized bed furnace, the air distribution system of the fluidized bed furnace, the feeding mode of the fluidized bed furnace and the slag discharging system were established. The integrated optimization of acid-producing system meets the system requirements of high-sulfur ore roasting, and the production efficiency and product quality are obviously improved. The optimized system is suitable for the new process of acid production from high-sulfur concentrate with weak oxygen roasting, and the equipment runs stably. The yield of iron powder is 110 t / d, which can be exported directly, the residue residue sulfur is 0.28%, the iron grade is 62.2%.
【学位授予单位】：中国科学院大学(中国科学院过程工程研究所)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ111.16

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