Process Optimization Experiment of Preparing Light Ceramsite from Qinghai Reshui Coal Gangue

Abstract

Qinghai has abundant coal resources, but the accumulation of coal gangue poses a certain threat to the fragile ecology of the area. In this paper, coal gangue light ceramsite was prepared by using coal gangue from Qinghai Reshui coal mine as raw material and sodium carbonate as auxiliary material. The optimized process conditions are as follows: the mass ratio coal of gangue and sodium carbonate = 50:1 (10% hydrochloric acid contamination); the drying temperature is 105±2°C; the drying time is 90min; preheating temperature is 450°C; the preheating time is 10 min; the calcination temperature is 950 °C; the roasting time is 15 min. The ceramsite prepared under this condition has a packing density of 423 kg/m3 and a bulk density of 889 kg/m3. The process does not use fly ash, and all the coal gangue raw materials were used without any residue, which can effectively reduce the environmental pressure brought by the accumulation of coal gangue, and has high industrial application value.