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重金属元素对高能射线具有优良的屏蔽性能,将富含重金属污泥烧制成集料,并利用其制备成防辐射混凝土,可有效解决重金属污染和高密度矿石配制的防辐射混凝土匀质性不良的问题。利用钢铁废水污泥、钡泥、铜渣和电镀污泥作为主要原材料,掺入页岩、淤泥等校正原料,研究了生料的化学组成、烧成制度对防辐射功能集料的矿物组成、力学性能和屏蔽性能的影响规律,提出了各种富含重金属污泥与校正原料的适宜掺配比例和烧成制度。烧制的防辐射集料,其抗压强度>40 MPa,表观密度均在2.2~3.0g/cm~3之间,对0.662MeVγ射线的线性衰弱系数均大于铁矿石,接近重晶石,其重金属浸出浓度符合GB5080.3—2007《危险废物鉴别标准-浸出毒性鉴别》国家标准要求。
Heavy metal elements have excellent shielding performance for high-energy radiation, the heavy metal-rich sludge is burned into aggregates and used to prepare radiation-proof concrete, which can effectively solve the problems of heavy metal pollution and high-density ores prepared by radiation homogenization of poor concrete homogeneity The problem. Iron and steel wastewater sludge, barium, copper slag and electroplating sludge as the main raw material, shale, sludge and other correctional materials incorporated into raw materials to study the chemical composition of the firing system of radiation-resistant aggregates of mineral composition, Mechanical properties and shielding properties of the law, proposed a variety of heavy metal-rich sludge and the correct mixing ratio of raw materials and the firing system. The fired radiation aggregate has compressive strength> 40 MPa and apparent density of 2.2 ~ 3.0 g / cm ~ 3. The linear weakening coefficient of 0.662 MeV γ ray is larger than that of iron ore, , Its heavy metal leaching concentration in line with GB5080.3-2007 “Hazardous Waste Identification Standard - Identification of leaching toxicity,” the national standard.