磷石膏、钾长石与焦炭热反应试验及机理研究

发布时间：2018-01-24 22:40

本文关键词： 磷石膏钾长石高温焙烧反应机理　出处：《矿产综合利用》2017年05期 　论文类型：期刊论文

【摘要】：利用磷石膏、钾长石与焦炭在高温条件下焙烧生产SO_2制酸并联产硅钙钾镁肥。以磷石膏与钾长石配比、焦炭用量、焙烧温度、焙烧时间为主要因素进行单因素试验,以枸溶性钾的溶出率为主要考察指标,分析各因素对焙烧反应的影响,在最优条件下,枸溶性钾的溶出率为95%。对钾长石与CaO、钾长石与CaSO_4高温焙烧过程进行研究,结果表明CaO与CaSO_4均可单独与钾长石发生反应,CaO与钾长石反应比较彻底,能置换出钾长石中的钾元素,但部分K2_O以气体形式逸出;CaSO_4与钾长石反应程度低,但SO_4~(2-)能固定钾长石分解的钾元素。
[Abstract]:Phosphorous gypsum, potassium feldspar and coke were roasted under high temperature to produce SO_2 acid and co-produce calcium calcium potassium magnesium fertilizer. The ratio of phosphogypsum and potassium feldspar, the amount of coke and the calcination temperature were used. The single factor experiment was carried out with roasting time as the main factor and the dissolution rate of citric soluble potassium as the main index. The influence of each factor on the roasting reaction was analyzed under the optimum conditions. The dissolution rate of citric soluble potassium is 95. The calcination process of potassium feldspar and Cao, potassium feldspar and CaSO_4 at high temperature is studied. The results show that CaO and CaSO_4 can react with potassium feldspar separately. CaO reacts thoroughly with potassium feldspar and can replace potassium element in potassium feldspar, but some K _ 2O escapes in the form of gas. The reaction degree between CaSO_4 and potassium feldspar is low, but so _ 4 / C _ 2) can immobilize the potassium element decomposed by potassium feldspar.
【作者单位】：金正大生态工程集团股份有限公司;养分资源高效开发与综合利用国家重点实验室;金正大诺泰尔化学有限公司;
【基金】：30万t/年磷石膏制酸联产土壤调理剂工程资源节约和环境保护2015年中央预算内投资备选项目黔发改投资[2015]933号
【分类号】：TQ440.1
【正文快照】： 磷石膏是湿法磷酸生产过程中产生的以硫酸钙为主的固体副产物,通常每生产1 t磷酸约副产5t磷石膏[1-2]。我国已成为世界上第一大磷肥生产国,同时也是第一大磷石膏副产国,我国每年产生磷石膏近7000万t,总堆存量超过3亿t[3]。但我国磷石膏的综合利用率很低,只有20%左右[4]。磷石

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