新闻动态
新闻动态 当前位置:首页>新闻动态>新闻动态

无机硅胶用途

网址:  2019-03-19  作者:admin    阅读:

硅胶可以用来作干燥剂,而且可以重复使用。硅胶是由硅酸凝胶mSiO2·nH2O适当脱水而成的颗粒大小不同的多孔物质。具有开放的多孔结构,比表面(单位质量的表面积)很大,能吸附许多物质,是一种很好的干燥剂、吸附剂和催化剂载体。硅胶的吸附作用主要是物理吸附,可以再生和反复使用。 在碱金属硅酸盐(如硅酸钠)溶液中加酸,使之酸化,再加入一定量的电解质进行搅拌,即生成硅酸凝胶;或者在较浓的硅酸钠溶液中加酸或铵盐也能生成硅酸凝胶。将硅酸凝胶静置几小时使之老化,然后用热水洗去可溶性盐类,在60~70℃下烘干并在约300℃时活化,即可得硅胶。 将硅酸凝胶用氯化钴溶液浸泡后再烘干和活化,可得变色硅胶。用它作干燥剂时,吸水前是蓝色,吸水后变红色,从颜色的变化可以看出吸水程度,以及是否需要再生处理。硅胶还广泛用于蒸气的回收、石油的精炼和催化剂的制备等方面。硅胶还能用来做手机壳,具有极其高的防摔性
Silica gel can be used as a desiccant and can be reused. Silica gel is a porous material with different particle sizes due to proper dehydration of silica gel mSiO2? NH2O. It has open porous structure, large specific surface area per unit mass, and can adsorb many substances. It is a good desiccant, adsorbent and catalyst carrier. The adsorption of silica gel is mainly physical adsorption, which can be regenerated caiguangwa.89ix.comdipinh.89ix.comdipingg.89ix.comzhusuji.89ix.comceshi.89ix.commend.89ix.comand reused. In alkaline silicate (such as sodium silicate) solution add acid, acidification, add a certain amount of electrolytes to stir, that is to form silicic acid gel, or in a strong sodium silicate solution, adding acid or ammonium salt can also produce silica gel. Silica gel was placed for several hours to make it aged, then washed with hot water to remove soluble salts, dried at 60~70 degrees Celsius and activated at about 300 degrees, so that silica gel can be obtained. The silica gel is soaked in cobalt chloride solution and then dried and activated to obtain discolourant silica gel. When it is used as a desiccant, it is blue before water absorption, and becomes red after water absorption. From the change of color, we can see the degree of water absorption and whether it needs regeneration. Silica gel is also widely used in steam recovery, petroleum refining and catalyst preparation. Silica gel can also be used as mobile phone shell, with extremely high anti-fall performance.

转让电话
13313028229