摘要
采用DLVO理论对pH值分别为1.9、6.5及12条件下膨润土颗粒间的接触方式进行了计算分析。结果表明pH值为1.9时,膨润土主要以底面-底面及底面-端面接触为主;pH为6.5时,膨润土以底面-端面、端面-端面接触为主;pH为12时,膨润土在分散介质中不易凝聚。沉降试验结果表明,随着pH值升高,膨润土粒径减小,沉降时间延长。以底面-底面接触、端面-端面接触的"卡片宫"结构最稳定,具有最低的等速压缩沉降速度。
Contact models of bentonite particulates at pH values of 1.9,6.5 and 12 were calculated and analyzed using DLVO theory.Face-face and face-edge contact models prevail at pH 1.9,and face-edge and edge-edge contact models prevail at pH 6.5,while bentonite in the suspension of pH 12 is difficult to coagulate.The results of settlement experiments indicate that the diameter of bentonite decreased and the settling time increased with the climbing of pH value.The ＂card house＂ structure of face-face and edge-edge contact is the most stable form,and it has the lowest settling velocity in the compression stage.
出处
《矿冶工程》
CAS
CSCD
北大核心
2011年第3期59-61,65,共4页
Mining and Metallurgical Engineering
关键词
膨润土
DLVO势能
沉降曲线
凝聚
bentonite
DLVO potential
settlement curve
coagulation
