CAJ | 학술논문

首先测定了KAlSi_3O_8-CaSO_4-CaCO_3体系在不同焙烧条件下钾长石转化成可溶性氧化钾的转化率,进而通过模拟计算表明:KAlSi_3O_8-CaSO_4-CaCO_3体系的固相扩散动力学过程符合金斯特林格动力学方程,反应表观活化能Ea为128.92 kJ/mol.并着重考察了4种添加剂Na_2SO_4、Na_2SO_3、NaCl和NaF对 KAlSi_3O_8-CaSO_4-CaCO_3体系的影响,结果表明:向体系中分别加入占反应物总质量3%的Na_2SO_4、Na_2SO_3、NaCl和1%的NaF后,体系的反应表观活化能Ea从原来的128.92 kJ/mol依次下降至87.15、98.71、117.38和126.14 kJ/mol,这表明4种添加剂中Na_2SO_4的效果最好,它能较大程度上降低反应表观活化能,从而降低反应温度和提高固相反应速率.
수선측정료KAlSi_3O_8-CaSO_4-CaCO_3체계재불동배소조건하갑장석전화성가용성양화갑적전화솔,진이통과모의계산표명:KAlSi_3O_8-CaSO_4-CaCO_3체계적고상확산동역학과정부합금사특림격동역학방정,반응표관활화능Ea위128.92 kJ/mol.병착중고찰료4충첨가제Na_2SO_4、Na_2SO_3、NaCl화NaF대 KAlSi_3O_8-CaSO_4-CaCO_3체계적영향,결과표명:향체계중분별가입점반응물총질량3%적Na_2SO_4、Na_2SO_3、NaCl화1%적NaF후,체계적반응표관활화능Ea종원래적128.92 kJ/mol의차하강지87.15、98.71、117.38화126.14 kJ/mol,저표명4충첨가제중Na_2SO_4적효과최호,타능교대정도상강저반응표관활화능,종이강저반응온도화제고고상반응속솔.
K-feldspar (KAlSi_3O_8) is a major potassic aluminosilicate mineral in nature, and its total reserves are up to 4.641 billion tons in China. Up till now, however, there still exist many difficulties in using this resource directly as potash fertilizer in agriculture due to its high insolubility. In order to decrease the calcination temperature and shorten the calcination time for transforming K-feldspar into soluble potash salt and hence reducing the production costs, this paper has discussed the influences of the addition of four types of fusing agents on the KAlSi_3O_8-CaSO_4-CaCO_3 system and selected the most favorable fusing agents. The transformation ratios from K-feldspar mineral to soluble K_2O in the KAlSi_3O_8-CaSO_4-CaCO_3 system under different calcination conditions were detected systematically. A simulation calculation on such a basis demonstrated that the solid diffusion dynamical process in this reaction was in accordance with the Ginstling dynamic equation, with its apparent activation energy Ea being 128.92 kJ/mol. Four types of fusing agents, namely Na_2SO_4, Na_2SO_3, NaCl and NaF, were added into this reaction system respectively by 3%, 3%, 3% and 1% of the total mass of reactant, and the value of the apparent activation energy Ea was decreased from 128.92 to 87.15, 98.71, 117.38 and 126.14 kJ/mol in turn. It is thus shown that Na_2SO_4 may be the most favorable fusing agent, which can reduce apparent activation energy Ea, decrease reaction temperature effectively and speed up solid diffusion velocity in the KAlSi_3O_8-CaSO_4-CaCO_3 system.