MATERIAL COMPOSITION AND PROPERTIES OF RED MUD COMING FROM ALUMINA PROCESSING PLANT TANRAI, LAMDONG, VIETNAM

Red Mud coming from Tanrai Alumina Processing plant, Lamdong, Vietnam contains high excess alkaline component and many toxic heavy metals. The results showed that Red mud does not contain artificial radioactive isotopes such as 137 Cs, 7 Be; concentration of Uranium, Thorium in Red mud are less than the average concentration values of Uranium (2ppm) and Thorium (12ppm) in the earth's crust; annual effective dose caused by gamma radiation is smaller than the average effective dose was recommended by UNSCEAR. Physical texture of Red mud classified by equilateral triangle are sandy loam (57.1% sand; limon 33.8%; clay 9.1%). Chemical composition of Red mud is, by weight (% w/w): Fe 2O3 - 30.8; SiO2 31.7; Al2O3 - 15.6; TiO2 - 2.58; Na2O - 3.14, CaO - 3.51; K2O - 0.11; MgO - 0.27; MnO - 0.02; P2O5 - 0.22. Red mud also contains some heavy metals and have pHH2O and pHKCl are 11.23 and 11.12 respectively. The seearch results are an important basis to orient treatment and recovery this source for construction materials production.