摘要
以硼砂和消石灰为原料,经反应、过滤、洗涤及干燥制备出偏硼酸钙(CaO·B2O3·6H2O)产品。经过实验研究确定了适宜的工艺条件:硼钙配料比(氧化硼与氧化钙质量比)在2.2:1左右;液固体积质量比为2.76mL/g左右;温度为35℃;反应时间为8～10h。在此工艺条件下制得的偏硼酸钙产品含氧化硼质量分数为29%～31%、氧化钙质量分数为23%～25%、氧化钠质量分数≤0.5%。产物的X射线衍射分析和热重分析表明,合成的产品为六水合偏硼酸钙纯相,扫描电镜显示产物为白色的不规则六边形条状晶体。
Borax was employed to react with slaked lime in water, and resultant mixture was then washed and filtrated to obtain calcium metaborate hexahydrate（ CaO · B2O3 · 6H2O）. Based on experiments, suitable process parameters were obtained,namely, m（ B2O3）/m（CaO） of reactive raw materials was about 2.2：1 ;volume to mass ratio of liquid to solid was about 2.76 mL/g;reaction temperature and time. were 35 ℃ and 8 - 10 h,respectively. Mass fractions of B203 and CaO in the product have reached 29% -31% and 23% - 25% respectively and mass fraction of Ns2O was less than 0.5%. XRD and TG - DTA analysis indicated that the product was calcium metaborate hexahydrate, and SEM analysis showed that the product was irregular hexagon long-and-narrow crystal.
出处
《无机盐工业》
CAS
北大核心
2009年第4期31-34,共4页
Inorganic Chemicals Industry
关键词
偏硼酸钙
硼砂
消石灰
calcium metaborate
borax
slaked lime
