PRELIMINARY STUDY ON PREPARATION PROCESS OF HIGH-PERFORMANCE CERAMSITE FROM IRON ORE TAILINGS AND COAL GANGUE
In this study,iron ore tailings and coal gangue were used as raw materials to prepare high-strength and lightweight ceramsite by referring to the methods and equipment of iron ore pelletization in ferrous metallurgy.The influence of pelleting parameters on the properties of the pellet,and the influence of roasting parameters on the properties of ceramsite were investigated,and the structure-function relationship among the phase composition,structure,and performance of the ceramsite was explored.The results showed that the composition structure of 45％iron ore tailings and 55％coal gangue was calculated based on Riley's three-phase diagram,and the green pellet was prepared under the conditions of 60％of particle size below 0.074 mm,8 min pelletizing duration,and 10.5％moisture.After drying,the dried pellet was roasted at 1175 ℃ for 25 min to prepare ceramsite.The bulk density,apparent density,1 h water absorption,and cylinder compressive strength was 859 kg/m3,1705 kg/m3,8.0％,and 6.7 MPa,which meet the requirements of various indexes of high-strength and light-weight ceramsite.The main phases of the ceramsite are quartz,feldspar,and hematite,which can provide strength for ceramsite.The well-developed pores in the ceramsite are beneficial to reducing bulk density,and apparent density,but the over-developed pores of the outer layer harm the cylinder compression strength.
iron ore tailingscoal ganguehigh-strength and light-weight ceramsitepellet
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