Experimental study on the making of sintered brick using municipal sludge in Shenyang City

Taking municipal sludge of Shenyang City as an example, the operation processes and product application feasibility of sintered brick made of sludge mixed with coal gangue and shale were explored. The optimal sintering system was determined by optimizing the proportion of mixed materials through raw material test and evaluation and orthogonal experiment. On this basis, the influence of sludge addition on the performance of brick and the environmental safety of brick samples were evaluated. The results showed: The optimum sintering system for brick making with three kinds of mixed materials was as follows: sludge addition was 5%, sintering temperature was 1 050 ℃ and sintering time was 9 h. The performance of sintered brick samples met or exceeded Fired Common Bricks ( GB 5101-2003). In the test of mixed materials, the compressive strength of sintered bricks with sludge addition of 0%-15% could meet the factory standard. The sintered bricks with 0%-20% sludge, 1 050 ℃ sintering temperature and 9 h sintering time were safe and harmless for the environment.