磷石膏、钾长石与焦炭热反应试验及机理研究

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。

Study on the thermal reaction test and mechanism of phosphorus gypsum, potassium feldspar and coke

Sulphur dioxide and silicon, calcium, potassium and magnesium fertilizers were produced synchronously by using phosphorus gypsum, potassium and coke at high-temperature calcination condition. The main factors such as ratio of phosphorus gypsum to potassium feldspar, the dosage of coke , burned temperature, burned time were studied through single-factor test. In terms of citrate-soluble potassium as the main examine index, and analysis of the effect of various factors on the roasting reaction, under the optimal conditions the citrate-soluble potassium dissolution rate was 95%. Study on the potassium feldspar-CaO system, potassium feldspar-CaSO4 system under high-temperature calcination process, the results show that potassium feldspar can react with CaO and CaSO4 separate, CaO and potassium feldspar reaction completely, can replace the potassium, but some of K2O overflow in the form of gas. Low degree of CaSO4 reaction with potassium feldspar, but SO42-can be fixed potassium decomposition of potassium feldspar.