Research on preparation of non-sintered ceramsite from gasification cinder and its performance

In order to realize the resource disposal and harmless utilization of gasification cinder,we took it as the main raw material,and nine sets of non-sintered ceramsites from gasification cinder with different proportions were prepared by the improved method of non-sintered curing.The stacking density,cylinder compressive strength and water absorption of each ceramsite were tested，the attained performance was evaluated.Accounting to the result of which,experimental groups that could enter the test of leaching toxicity were selected.With the detection of the contents of four kinds of heavy metals:Cr,As,Cd and Pb in the leaching solution,their environmental safety was evaluated.The results showed that the cylinder compressive strength of ceramsites all met the requirement of GB/T 17431.1—2010“Lightweight aggregates and its test methods—Part 1:Lightweight aggregates”，the value with the range of 5.59～8.71 MPa.And the water absorption increased with the increase of the content of gasification cinder in ceramsite.The best formula for preparing the ceramsite with the highest attained performance score and the conformity of environmental safety standards was gasification cinder 73%,cement 15% and quartz sand 12% (mass fractions).The results of leaching toxicity showed that non-sintered method posted high immobilization ability of heavy metals in gasification cinder.