在研究分析城市污泥和煤矸石理化特性的基础上,以城市污泥和煤矸石为原料、稻壳作为造孔剂制备轻质烧结砖.结果表明,当城市污泥用量在50％时,随着污泥的增加,烧结砖的表观密度和抗压强度逐渐减小,而气孔率和吸水率逐渐增大;当污泥用量超过50％范围后,随着污泥的增加,烧结砖的表观密度和抗压强度反而有所增大,吸水率和气孔率相应明显减小.当煤矸石∶污泥=60∶40时,外掺6％和10％稻壳时,相应轻质烧结砖的抗压强度为10.27 MPa和4.44 MPa,分别达到承重墙体材料和非承重墙体材料抗压强度的国家标准要求.污泥中重金属等有害物质经过高温焙烧,形成稳定的固溶体,不会造成对人体及环境危害.
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