摘要:
利用磷石膏、钾长石与焦炭在高温条件下焙烧生产SO2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CaSO4高温焙烧过程进行研究,结果表明CaO与CaSO4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K2O以气体形式逸出;CaSO4与钾长石反应程度低,但SO4.能固定钾长石分解的钾元素.
关键词:
-
磷石膏
/
-
钾长石
/
-
高温焙烧
/
-
反应机理
Abstract:
Sulphur dioxide and silicon,calcium,potassium and magnesium fertilizers were produced synchronously by using phosphorus gypsum,potassium and coke under high-temperature calcination condition.The main factors such as ratio of phosphorus gypsum to potassium feldspar,the dosage of coke,calcination temperature and calcination time were studied through single-factor tests.With citrate-soluble potassium as the main examined index,the effect of various factors on the calcination reaction was analyzed.Under the optimal conditions the citrate-soluble potassium dissolution rate was 95 %.The high-temperature calcination processes of the potassium feldspar-CaO system and the potassium feldspar-CaSO4 system were studied.The results show that potassium feldspar can react with CaO and CaSO4 separately.CaO can react with potassium feldspar completely and can replace the potassium in potassium feldspar,but some of the K2O escapes in the form of gas.The degree of reaction between CaSO4 and potassium feldspar is very low,but SO42-can fix the potassium decomposed from potassium feldspar.
下载: