摘要
研究了蒙脱石、高岭石、水铝英石、蛭石和针铁矿在高温下释放氟污染物的特征 .结果表明 :高温下氟化物从这些矿物中的逸出率不仅随矿物种类而变化 ,而且与烧成温度、比表面积、矿物结构水含量的变化以及高温加热时间密切相关 .蒙脱石的晶格瓦解温度比高岭石的滞后 ,可能是不同高温下蒙脱石氟化物逸出比高岭石滞后的原因之一 .含钙化合物能降低氟从蒙脱石中的逸出率 .以CaCO3 处理蒙脱石为例 ,80 0℃时 ,氟化物逸出率比对照降低了 59.6% ,80 0℃时 ,5种含钙物质的固氟能力的大小顺序为 :CaCO3>CaO >Ca3(PO4 ) 2 >Ca(OH) 2>CaSO4 .
The emission characteristics of fluoride pollutants from montmorillonite, kaolinite, vermiculite, geothite and allophane were studied to elucidate the mechanism of fluoride releasing from soils during brick and tile making at high temperatures from 300℃ to 1000℃. The rate of fluoride emission varied with temperature, mineral type, heating time, specific surface area and cations added to minerals. The escape of crystalline water resulting from crystal lattice collapse at a certain high temperature was found to affect the rate of fluoride emission. Calcium compounds could decrease fluoride emission rate from montmorillonite. At 800℃, the rate of fluoride emission from Ca treated montmorillonite decreased by 59.6% compared to untreated montmorillonite. The order for fluoride fixing capacity of the 5 calcium compounds at 800℃ was as follows: CaCO 3>CaO>Ca 3(PO 4) 2>Ca(OH) 2>CaSO 4.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2001年第2期106-109,共4页
Environmental Science
基金
国家重点基础研究发展规划项目!(973项目
G19990 1180 9)
浙江省自然科学基金
