CAJ | 학술논문

为了探求钾长石、磷石膏制备硫酸钾的机理,以钾长石、石膏、氧化钙为原料,通过 XRD 图谱及钾溶出率分析研究了 n(钾长石)： n(CaSO4·2H2 O)： n(CaO)为1：1：(2~16)配料的热反应过程。结果表明：最适宜物料配比为1：1：10,在此配料体系下,焙烧产物中硅酸钙有 CS、C2 S 和 C3 S 三种,其组成、比例与体系的反应温度有关,硅铝酸钙盐只有 C2 AS 一种,无 C3 A 生成,与文献报告不一致；置换生成 K2 O 的反应有2种途径,当温度低于1100℃时,置换反应发生在 KAlSi3 O8与 CaO 之间,超过1100℃时,则 KAlSi3 O8与 CaO 和 KAlSi2 O6与 CaO 的置换生成反应共存；温度低于1200℃时,置换出的 K2 O 不能结合为硫酸盐,而是以气态的形式逸出；温度高于1200℃时,可溶性钾盐以 K2 S2 O8形式存在,无 K2 SO4成分。 TG-DSC 实验结果表明：体系置换反应起始温度约为1000℃,1100℃以后反应激烈进行,与不同温度下 XRD 图谱分析结果相吻合,高温下体系失重的原因是 K2 SO4转化为 K2 S2 O8释放出K2 O 并以气态逸出所致。
위료탐구갑장석、린석고제비류산갑적궤리,이갑장석、석고、양화개위원료,통과 XRD 도보급갑용출솔분석연구료 n(갑장석)： n(CaSO4·2H2 O)： n(CaO)위1：1：(2~16)배료적열반응과정。결과표명：최괄의물료배비위1：1：10,재차배료체계하,배소산물중규산개유 CS、C2 S 화 C3 S 삼충,기조성、비례여체계적반응온도유관,규려산개염지유 C2 AS 일충,무 C3 A 생성,여문헌보고불일치；치환생성 K2 O 적반응유2충도경,당온도저우1100℃시,치환반응발생재 KAlSi3 O8여 CaO 지간,초과1100℃시,칙 KAlSi3 O8여 CaO 화 KAlSi2 O6여 CaO 적치환생성반응공존；온도저우1200℃시,치환출적 K2 O 불능결합위류산염,이시이기태적형식일출；온도고우1200℃시,가용성갑염이 K2 S2 O8형식존재,무 K2 SO4성분。 TG-DSC 실험결과표명：체계치환반응기시온도약위1000℃,1100℃이후반응격렬진행,여불동온도하 XRD 도보분석결과상문합,고온하체계실중적원인시 K2 SO4전화위 K2 S2 O8석방출K2 O 병이기태일출소치。
To solve the problem of mechanism of potassium preparation with K-feldspar and phosphogysum, with K-feldspar, calcium sulfate and calcium oxide as raw materials, the thermal response process of system was analyzed under the different molar ratios ( n( K-feldspar) : n( CaSO4· 2H2 O): n(CaO) = 1: 1: (2 ~ 16)). The experiments show that the most suitable proportion of material is 1: 1: 10, under the batching system, there are three kinds of calcium silicate in the calcined products, including CS, C2 S and C3 S, and their composition and proportion are associated with the reaction temperature of system. Besides, there is only one form ( C2 AS) of sialic acid calcium salt, C3 A is nonexistent. These are inconsistent with the reported. There are two different reactions to displace generated K2 O, when the temperature is below 1 100 ℃, the replacement reaction occurs between KAlSi3 O8 and CaO, and when the temperature is higher than 1 100 ℃, CaO would react with KAlSi3 O8 and KAlSi2 O6 respectively. Furthermore, when the temperature is below 1 200 ℃, K2 O is not combined with sulfate radical to sulfate, but escaping as gas. When the temperature is higher than 1 200 ℃, soluble potassium exists as K2 S2 O8 , and K2 SO4 is unfound. TG-DSC experimental results show that the initial displacement reaction temperature of the system is about 1 000 ℃, and the reaction goes into overdrive when the temperature is higher than 1 100 ℃. The results are consistent with the XRD analysis of the product which calcined at different temperatures. The cause of system weight loss at high temperature is that K2 SO4 is converted into K2 S2 O8 by releasing gaseous K2 O.