焦家金矿尾矿旋流器溢流胶结充填水化机理研究

本文以焦家金矿选厂尾矿旋流器溢流产品为主要研究对象,分别考察了采用普通425水泥(OPC)和自制胶固粉(KD)作为胶凝材料时微细粒尾矿的水化机理.水化反应后OPC的结晶水化产物主要为Ca(OH)2、水化铝酸钙,另含有少量钙矾石(AFt);而KD的结晶水化产物主要为钙矾石,另含有少量氢氧化钙.两种胶凝材料水化反应后结晶水...

Study on Cementation Filling Hydration Mechanism of Hydrocyclone Overflow of Tailings in Jiaojia Gold Deposit

In this paper, taking overflow products of tailings cyclone in concentrator of Jiaojia gold deposit as main research object, hydration mechanism of fine tailings has been studied by using ordinary 425 cement (OPC) and self-made cementitious powder (KD) as cementitious materials. The main hydration products of OPC are Ca (OH) 2, calcium aluminate hydrate and a small amount of ettringite (AFT). The hydration products of KD are mainly ettringite and a small amount of calcium hydroxide. It is showed that the types of crystal hydration products of the two cementitious materials are obviously different. The cementation performance of KD material is better than that of OPC material, and the amount of KD in the test block is lower than that of OPC material to meet the same strength requirements. There are a lot of needle like ettringite filled between the pores of the particles in the KD consolidated body, which plays a bridging and supporting role in the structure. In the OPC consolidated body, the hydrated products, such as flaky Ca (OH) 2, CSH gel are not enough to completely fill the pores, and the "isolated island" structure is easy to appear in the structure, which has a negative effect on the strength.