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首页> 外文会议>China international conference on high-performance ceramics >A New Method of Producing High Purity 4A-Molecular Sieve from High Modulus Sodium Silicate Liquor Purified by Carbonization
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A New Method of Producing High Purity 4A-Molecular Sieve from High Modulus Sodium Silicate Liquor Purified by Carbonization

机译：碳化提纯高模量硅酸钠制液生产高纯度4A分子筛的新方法

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摘要

A new technology for producing high purity 4A-molecular sieve was developed with high modulus sodium silicate liquor and sodium aluminate liquor extracted from coal fly ash as starting materials.The sodium silicate liquor extract was purified by precipitating ferrous,titanium,and other impurities by carbon dioxide injection.Concentration of carbon dioxide in the extract was maintained at 48％,and the pH value of the extract controlled in the range of 11 and 11.2.After that,the purified sodium silicate liquor was mixed with sodium aluminate liquor in the ratios of SiO2/Al2O3=2.0,Na2O/SiO2=l.6 and H2O/Na2O=60.The mixture was then heated to 90 °C and kept for 2 h.A high purity 4A-molecular sieve product was obtained after washing and drying the crystals obtained from the reaction mixture.The molecular sieve product has a purity of 99％ and aperture of 0.4nm.Its calcium absorption capacity is about 290mg/g.The product was also characterized by SEM,BET,XRD and IR analysis.
机译：以高模量硅酸钠液和从粉煤灰中提取的铝酸钠液为原料，开发了生产高纯度4A分子筛的新技术。萃取液中二氧化碳的浓度保持在48％，萃取液的pH值控制在11和11.2之间。然后，将纯净的硅酸钠液与铝酸钠液按以下比例混合： SiO2 / Al2O3 = 2.0，Na2O / SiO2 = 1.6，H2O / Na2O = 60，然后将混合物加热至90°C并保持2小时，在洗涤和干燥所得晶体后获得高纯度4A分子筛产品该分子筛产物的纯度为99％，孔径为0.4nm。其钙吸收能力约为290mg / g。还通过SEM，BET，XRD和IR分析对产物进行了表征。

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