查詢結果分析
相關文獻
- Dissolution and Crystallization of Na-Ca Silicate Glasses in Na2CO3 Solutions
- 應用表面反應法於車削時和刀具限制接觸長度對切屑曲率半徑影響之研究
- Monte Carlo Simulation of the Effect of Diffusion and Island Formation on Laser Induced Thermal Desorption of Xe from W(110) Surfaces
- Synthesis of Merlinoite from Andesitic Tuff Under Hydrothermal Conditions
- 化學氣相沈積前驅物分子的表面化學
- 排煙脫硫吸收劑之研磨性與溶解速率評估
- 碳.矽和鋁對奧氏體不銹粉末燒結時表面反應的影響
- 非勻相氫氣/空氣/鉑反應之層流平板流數值模擬
- The Effects of the Finite Dissolution Rate on the Drug Release of Spherical Particles Loaded with Uniformly Dispersed Drugs
- 白化閃玉與蛇紋石實驗之化學成份變化
頁籤選單縮合
題 名 | Dissolution and Crystallization of Na-Ca Silicate Glasses in Na2CO3 Solutions=鈉鈣矽酸玻璃在碳酸鈉溶液中的溶解與結晶作用 |
---|---|
作 者 | 羅煥記; 陳惠芬; 宋聖榮; | 書刊名 | 中國地質學會會刊 |
卷 期 | 41:3 1998.08[民87.08] |
頁 次 | 頁381-408 |
分類號 | 357.56 |
關鍵詞 | 鈉鈣矽酸玻璃; 熱液實驗; 溶解速率; 表面反應; 共生順序; Na-Ca silicate glasses; Hydrothermal experiment; Rate of dissolution; Surface reaction; Paragenetic sequence; |
語 文 | 英文(English) |
中文摘要 | 本研究在探討鈉鈣矽酸玻璃,在熱液條件下的溶解機制和速率,以及共生礦物生 成的順序。實驗的條件為:壓力為蒸氣壓,溫度在攝氏 150 至 210 度之間,時間從三小時 至六十天,用濃度 0.25 至 1.7 莫爾,未加緩衝劑的碳酸鈉溶液。 實驗結果顯示,玻璃在 溶解過程中,其溶解速率近乎不變,依此,溶解作用隨時間的變化,可用公式 y=l-(l-k), 表示之。殘留玻璃表面的溶蝕現象顯示,溶解作用以表面反應為主。二氧化矽含量低的玻璃 常伴生溶濾層與破裂層。再就溶解速率而言,開放系統大於封閉系統的實驗;而溶解速率也 隨溫度、溶液濃度及玻璃中二氧化矽含量的增加而增加。溶解一段時間後,溶液達飽和而沈 澱,沈澱物均為晶質。本研究合成的礦物有霰石、方解石、針鈉鈣石、石英及四種含水鈉鈣 矽酸礦物,其中以四種含水鈉鈣矽酸礦物最重要。共生礦物生成的順序為:(一 ) 霰石→方 解石→針鈉鈣石→含水鈉鈣矽酸礦物( 1 ),( 2 )(二氧化矽含量低的玻璃);(二) 霰石→方解石→含水鈉鈣矽酸礦物( 1 )→含水鈉鈣矽酸礦物( 2 ),( 3 ), 石英→ 含水鈉鈣矽酸礦物( 4 )(二氧化矽含量高的玻璃)。 |
英文摘要 | Synthetic Na-Ca silicate glasses were used as the starting materials to study the mechanism and the rate of dissolution and the paragenetic sequence of mineral phases under hydrothermal experiments. The experiments were carried out under autogeneous pressures, temperatures from 150 ℃ to 210 ℃, and for durations of 3 hours to 60 days in the presence of 0.25 M to 1.7 M Na �� CO �� solutions without buffer. It is shown that the dissolution rate is near constant in the major part of dissolution of the glasses. Based on this, a simple equation, i.e., y = l-(l-k), is proposed to describe the kinetics of dissolution. Etched pits on the surface of residual glasses indicate thafr?he dissolution is mainly controlled by surface reactions. A cracked layer has been observed at the surface zone of the silicapoor glasses where a leached layer occurs. The rate of dissolution is higher under the open system than under the closed system. Temperature, solution concentration and silica content of glass sho@v a positive correlation with the rate of dissolution. Precipitation generally occurs after a certain duration of experiments and the precipitates are all crystalline. The minerals synthesized include aragonite, calcite, pectolite, quartz, and four species of Na-Ca silicate hydrates, i.e., Na-Ca silicate hydrate (1), (2), (3) and (4). Among them, the four Na-Ca silicate hydrates are essential. The paragenetic sequences of the synthetic minerals are: (a) aragonite → calcite → pectolite → Na-Ca silicate hydrate (1), (2) for the silica-poor glasses, and (b) aragonite → calcite → NaCa silicate hydrate (l) → Na-Ca silicate hydrate (2), (3), quartz → Na-Ca silicate hydrate (4) for the silica-rich ones. |
本系統中英文摘要資訊取自各篇刊載內容。