| CaMnSi2O6-CaAlSiAlO6系统的实验研究 |
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| 引用本文： | 石玉泉
,叶大年
,郭竞雄.CaMnSi2O6-CaAlSiAlO6系统的实验研究[J].地质科学,1977,12(4):343-354. |
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| 作者姓名： | 石玉泉 叶大年 郭竞雄 |
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| 摘 要： | 冶金炉渣是在迅速冷却的条件下结晶的,铸石是在熔体的固相线以下恒温结晶的,这两种情况皆属不平衡状态。过去的硅酸盐体系的实验研究几乎仅局限于平衡状态,对非平衡状态研究甚少,只是近来才开始这方面的研究。在硅锰渣铸石和硅锰渣微晶铸石中,主要矿物为锰铸普通辉石--钙锰辉石与钙契尔马克分子（CaAlSiAlO6）以及少量的Mg2Si2O6的固溶体,其次是钙蔷薇辉石和钙长石,另外还有极少量的方锰石、硫化锰等。
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EXPERIMENTAL STUDIES OF CaMnSi2O6-CaAlSiAlO6 SYSTEM |
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| Shi Yuquan,Yeh Danian,Guo Jingliong.EXPERIMENTAL STUDIES OF CaMnSi2O6-CaAlSiAlO6 SYSTEM[J].Chinese Journal of Geology,1977,12(4):343-354. |
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| Authors: | Shi Yuquan Yeh Danian Guo Jingliong |
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| Abstract: | The glasses of desired compositions in CaMnSi2O6-CaAlSiAlO6 system are prepared from the chemically pure MnSO·BW), Al(OH)3, CaCOs and natural quartz. The crystallization of the glasses was completed isothermally at subsolidus temperatures at 1 atm. The following conclusions may be made:1. By means of the crystallization of glasses at subsolidus temperatures (830-900℃) at 1 atm., the limited solubility of Ca-Tschermak’s molecule (Ca-Tsch) in johannssenite (Jh) is equal to 35 mol per cent. The relation between the d150 spacing of plane nets, and the content of Ca-Tsch in johannssenite solid solution (Jhss) is linear, in conformity with the so-called "vagard Law".2. The Jh,, can be inverted by heating into the triclinic bustamite. The inverted temperature (830°± - 950℃± rises as the Ca-Tsch content increases, while the inverted velocity would be decreased as the latter increases.3. In the crystal lattice of bustamite the Al2O3 is absent due to the fact that all bustamites inverted from Jhss have wholly invariable unit cell dimensions. In the process of facies change the Ca-Tsch was excluded from Jhss forming the anorthite by reacting with the silica of residual glasses. X-ray quantitative analysis shows that anorthite formed from facies change increases as Ca-Tsch content in Jhss increases.4. Differential thermal analysis shows that for the CaMnSi2O6-CaAlSiAlO6 system the oxidation of the glasses is slower than that of the crystalline material, that is, the former oxidizes at 700℃, while the latter at about 340℃.5. The crystallochemical duality of Mn2+ cation, the facies change from Jh into bustamite and the effect of Al on increasing the structural stability of Jh are discussed in this paper from the point of view of Belov’s "Second Chapter of silicate crystallochemistry’’.6. The experimental results may be applied to interpret a series of practical problems encountered in the production of casting stone by the slag of mangano-silieon alloy. |
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