金矿尾矿制备烧结砖的力学性能

Mechanical Properties of Sintered Brick Using Gold Tailings

本研究以金矿尾矿为主料,黏土为辅料制备烧结砖,探究原料配比、成型水分及烧制工艺对尾矿烧结砖抗压强度、吸水率,体积密度和烧失重的影响。结果显示:烧结砖的抗压强度、烧失重和体积密度随黏土掺量、烧结时间和保温时间的增加而增大;吸水率随黏土掺量、烧结时间和保温时间的增加而减小;烧结砖吸水率、烧失重和体积密度随成型水分的增加而增大。在尽量利用金矿尾矿的前提下,制备的金矿尾矿烧结砖的最佳烧制参数为:金矿尾矿∶黏土(质量比)为7∶3、成型水分25%、烧结温度1000℃、保温时间2h。在砖烧制过程中,随温度升高,砖坯中结合水、结构水及结晶水随之排出;原料中透长石、硫铁矿、蒙脱石和方解石发生分解,形成了赤铁矿和钙长石。

This paper presents a study to use gold mine tailings to make sintered brick.In the process,the gold tailings were mixed with clay.The effect of materials ratio,molding moisture and calcination process on sintered brick properties(compressive strength,loss on ignition and bulk density)were investigated by experimental study.The test results show that the compressive strength,loss on ignition and bulk density of the sintered bricks increase with the increase of clay content,firing time and holding time.However,the water absorption decreases with the increase of clay content,firing time and holding time.The water absorption,loss on ignition and bulk density of the sintered bricks increase with the increase content of forming water.On the premise of making the best use of gold tailings,the calcination parameters were determined through experiments.The mass ratio of tailings to clay is 7∶3,and forming water content,firing temperature and holding time are 25%,1000℃,2 h respectively.The analysis results show that the bound water,structural water and crystal water in the unfired brick are released during the firing process.The permeable feldspar,pyrite,montmorillonite and calcite in the raw materials are decomposed to form hematite and anorthite.