Thesis Advisor叶树峰
Degree Grantor中国科学院大学
Degree Name硕士
Degree Discipline化学工程

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。本论文通过大量小型试验,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机理,建立了“高硫精矿弱氧焙烧制酸与含铁组分价态控制”模型,并以此为理论基础,对招金贵合原有80kt/a硫铁矿制酸系统进行高硫精矿弱氧焙烧改造升级,主要对该工艺流程系统的焙烧强度、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、产酸系统等进行了革新改造。本研究形成了“高硫铁矿弱氧焙烧制酸与含铁组分价态控制”的关键技术核心体系,应用该核心技术将原有80kt/a适合于低品位硫铁矿制酸工艺流程系统改造升级为适合于高硫铁矿弱氧焙烧制酸新工艺流程体系,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%,经济社会效益显著。;A large amount of pyrite slag produced by pyrite slag containing low iron after acid preparation through roasting stacks for a long time and increases year by year, it not only occupies a lot of land resources and leads to environmental pollution, but also results in a great waste of resources. The waste heat produced by acid preparation cannot be fully utilized as well. Accounting for these problems, in order to make full use of mineral resources and improve the economic and social efficiency of enterprises, low grade pyrite need to be substituted by high sulfur concentrate to prepare sulphuric acid by roasting.This paper focuses on investigating the influence mechanism of boiling temperature, flue gas residence time, bottom pressure on the residual sulfur content in slag through a lot of small-scale experiment, established “sulphuric acid preparation by roasting high sulfur concentrate under weak oxygen and valence control of iron containing component” model. On this theoretical basis, the 80kt/a sulphuric acid preparation system only suitable for roasting low grade pyrite in Zhaojin Guihe was reformed to roast high sulfur concentrate under weak oxygen, including roasting intensity reform, slag discharge opening of boiling furnace reform, boiling furnace air distributor reform, boiling furnace feeding reform, slag discharge system reform, acid producing system reform etc.This study formed a key technology system of "Acid preparation through roasting high pyrite under oxygen weak and valence state control of iron containing components ". The original acid preparation process of 80kt/a suitable for toasting low pyrite is reformed to be applicable for roasting high grade pyrite under weak oxygen through the core technology. The process runs stable with 99.6% of start-up rate, 245t/d production of acid (100%) which reaches the standard of GB/T534-2002, 110t/d production of iron powder which can be directly sold, 0.28% of sulfur residue and iron grade of 62.2%, bringing significant economic and social benefit. 

Document Type学位论文
Recommended Citation
GB/T 7714
杨洪忠. 高硫精矿弱氧焙烧制酸与含铁组分价态控制技术研究[D]. 中国科学院大学,2017.
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