摘要
为配合化工产品新工艺的开发，研究了25～70℃硫酸钙-硫酸钠-铬酸钙-铬酸钠-水体系中复盐的生成规律。摇床实验及X射线衍射分析发现，将固体铬酸钙加入不同浓度的硫酸钠和铬酸钠溶液中时，除生成CaSO4·2H2O外，还可能生成4种复盐沉淀，即CaSO4·Na2SO4，CaSO4·Na2SO4·4H2O，CaSO4·2Na2SO4-2H2O和5CaSO4·Na2SO4·3H20。当温度和溶液浓度发生变化时，复盐的形式会相应变化，低温稀溶液中只有CaSO4·2H2O沉淀，没有复盐沉淀析出，而高温浓溶液中，4种复盐都会析出。
The formation of double salts in CaSO4 -Na2SO4 -CaCrO4 -Na2CrO4 -H2O system at 25 -70 ℃ is studied. Through the viberating- bed experiment and XRD analysis ,it is found that when the solid CaCrO4 is added in the aqueous solution of Na2SO4 and Na2CrO4 with different concentration,in addition to the CaSO4 · 2H2O is formed,four kind of double salts,i, e. CaSO4 · Na2SO4,CaSO4 · Na2SO4 · 4H2O,CaSO4 · 2Na2SO4 · 2H2O and 5CASO4 · Na2SO4 · 3H2O are also formed. At low temperature and in dilute solution,only CaSO4 · 2H2O is formed,no double salt can be formed,while at high temperature and in concentrated solution, the four kinds of double salts can be precipitated.
出处
《无机盐工业》
CAS
北大核心
2006年第6期30-32,38,共4页
Inorganic Chemicals Industry
关键词
硫酸钙
铬酸钙
硫酸钠
铬酸钠
复盐
calcium sulfate
calcium chromate
sodium sulfate
sodium chromate ； double salts
