超塑化剂对微细粒料浆流动性的影响  

Effect of Superplasticizers on the Fluidity of Microfine Slurry

作　　者：郑娟荣[1] 赵振波[1] 吕杉杉[1] 

机构地区：[1]郑州大学土木工程学院,河南郑州450002

出　　处：《金属矿山》2014年第1期154-157,共4页Metal Mine

基　　金：国家自然科学基金项目(编号:51274174)

摘　　要：全尾膏体胶结充填地下采空区成为建设环境友好、资源高效利用型地下矿山的必然选择。为解决尾矿砂粒度变细带来的全尾膏体流动性及浓度下降的问题,探索了聚羧酸系及萘系超塑化剂对水泥和微细尾砂净浆流动度的影响,并对试验产品的絮网结构进行了显微分析。结果表明:聚羧酸系超塑化剂能显著提高水泥和微细尾砂净浆的流动度;萘系超塑化剂对水泥净浆流动度也有明显提高,但对微细尾砂净浆流动度提高的幅度十分有限;显微镜下水泥和微细尾砂净浆在未掺超塑化剂时具有相似的絮网结构,由于微细尾砂粒度更细,因而其絮网结构更小、结合力更大;与基于静电斥力效应的萘系超塑化剂相比,基于空间位阻效应的聚羧酸系超塑化剂能打开结合力较强的絮网结构,释放更多自由水,使料浆流动度增大。因此,聚羧酸系超塑化剂将是制备全尾砂膏体胶结充填料浆的潜在优良外加剂。Total tailings paste cemented backfill is a necessary choice of developing underground mining with environ- mentally friendly and resource efficient use of type. In order to resolve the problem of the fluidity and concentration fall of total tailings paste produced by refined tailings, effect of polycarboxylate and naphthalene sulfonate superplasticizers on the fluidity of cement and microflne tailings slurry was explored and the microscopic analysis of the flocculation structure of the test sam- ples was carried out. The test results showed that polycarboxylate superplasticizer greatly increased the fluidity of cement and microfine tailings slurry, and naphthalene sulfonate superplasticizer also obviously increased the fluidity of cement slurry but less increased the fluidity of microfine tailings slurry. The cement slurry and microfine tailings slurry without superplasticizers had similar floceulation structures observed by microscope, and the flocculation structures of tailings slurry were smaller and their bond force was stronger because of finer particle size of tailings compared with cement slurry, polycarboxylate superplasti- eizer based on steric hindrance effect could break flocculation structures with strong bond and released more free water to in- crease slurry fluidity in comparison with naphthalene sulfonate superplasticizer based on electrostatic repulsion force effect. So, the conclusion is that polycarboxylate superplasticizer will be a potential excellent admixture in preparing total tailing paste ce- mented backfill slurry.

关 键 词：微细尾砂 水泥 净浆流动度 絮网结构 超塑化剂 

分 类 号：X751[环境科学与工程—环境工程] TD926.4[矿业工程—选矿]