Abstract: Fracturing propping agents, which the grain diameter was 425-850 μm and could be able to work under clossing pressure 35 MPa, were prepared by sintering process with flint clay as a new material and dolomite as adjuvant material.The effects of dolomite addition contenton the grain growth and performance of propping agent prepared by flint clay were investigated deeply.The morphology structure and phase analysis of fracturing proppants were investigated by SEM and XRD.The volume/apparent density and breakage radio of different sample were tested many times.The results reveal that the addition of dolomite in ceramic proppant is helpful to boost mullite and can decrease volume/apparent density but the breakage radio is still below 9%.

Key words: flint clay;dolomite;fracturing propping agent;low-density