氟硅酸钾滴定法测定铬矿中二氧化硅  

Determination of silicon dioxide in chromium ore by potassium fluosilicate titrimetry

作　　者：戚淑芳[1] 邴一宏[1] 张杰[1] 王隽[1] 

机构地区：[1]鞍钢股份公司技术中心,辽宁鞍山114009

出　　处：《冶金分析》2010年第9期74-76,共3页Metallurgical Analysis

摘　　要：提出了采用KOH或KOH-KNO3低温亚熔盐法分解铬矿,用氟硅酸钾滴定法测定其中二氧化硅的方法。本方法消除了Al2O3及MgO的共沉淀干扰,同时避免了过氧化钠对坩埚材料的严重腐蚀,坩埚使用寿命比用过氧化钠高温熔融时提高了10倍以上。用自制的带塑料抽滤器的抽滤瓶抽滤沉淀物,速度快,残余酸易洗涤、中和,无漏滤现象。方法用于铬矿中二氧化硅的测定,相对标准偏差(RSD)小于1.3%,回收率为98%～101%。Decomposing the chromium ore by KOH or KOH-KNO3 low temperature sub-molten salt method,silicon dioxide in it was determined by potassium fluoride titrimetry.This method not only eliminated the interference of the co-precipitation formed by Al2O3 and MgO,while avoiding the severe corrosion to the crucible material by introducing the sodium peroxide,but also improved the service life of crucible by more than 10 times in comparison with sodium peroxide fusion method.A self-made filter flask with a plastic pump device was adopted,which has such advantages as： fast and easy to filtrate and wash and neutralize acid,leak-free.This method has been applied to determine SiO2 in chromium ore with relative standard deviation（RSD） less than 1.3 %,and recoveries of 98 %-101 %.

关 键 词：铬矿 二氧化硅 低温亚熔 氟硅酸钾滴定法 

分 类 号：TG115.313[金属学及工艺—物理冶金]