freon-free refrigerator

The framework silicon enriched Y zeolite was prepared with fluorine free technique in aqueous solution.

运用ＸＲＤ衍射、红外光谱、固体核磁共振、氨吸附差热、微型脉冲反应等手段对无氟液相法制备的高硅Ｙ沸石的结构性质、酸性及裂化活性进行研究，并与液相氟硅酸法制备的高硅Ｙ沸石进行比较。

In this paper, the relationship between component and melting point of fluorine free mould fluxes was studied by means of regressive orthogonal design.

论文利用二次正交回归的设计方法对无氟保护渣的成分与熔点的关系进行了研究。

Under hydrofluoric acid free and less sulfuric acid conditions, they are separated from each other by combined use of anionic and cationic collectors, increasing SiO 2 content of quartz from 86% to above 97% and reducing Fe 2O 3 content to 0.

在无氟少酸条件下 ,采用阴阳离子混合捕收剂浮选分离物理化学性质、结构构造等方面均十分相似的石英和长石 ,将石英砂SiO2 含量从 86%提高到 97%以上 ,Fe2 O3含量降到 0 。