弧叶型旋转窑烧制污泥陶粒实验研究

实验选取污水污泥、粉煤灰和港口淤泥为原辅材料,采取正交实验设计物料质量配合比与烧制工艺参数,遴选出最佳物料配比和优化的烧制工艺;依照选定物料配比和工艺参数采用弧叶型旋转窑烧制污泥陶粒并测定产品的1 h吸水率,软化系数,堆积密度,表观密度,颗粒级配,粒型系数以及产品浸出毒性等技术指标,选取制得陶粒产品替代全部天然石料配制...

Experimental study on producing ceramsite with sewage sludge in arc blade rotary kiln

The sewage sludge, PFA (pulverized fuel ash) and harbor sludge were used as raw materials to carry out the experiments. The orthogonal experimental method was used to arrange experiments on the mixture ratio of green pellets and factors of firing process to find out the best ratio of green pellets and the seemly parameters of firing process. In accordance with the selected ratio and firing process factors, experiments were carried out through the arc blade rotary kiln to produce lightweight aggregates. The characteristics of products such as the 1 h water absorption rate, softening coefficient, loose bulk density, apparent density, grain composition, grain shape factor and the extraction toxicity factors were detected. The aggregates made by the arc blade rotary kiln were used to make standard unit concrete instead of stones. After 3 days, 7 days and 28 days standard curing of the concrete, the specifications of the standard unit concrete such as the compressive strength, bulk density and thermal conduction coefficient was tested. The results showed that the lightweight aggregate can fit the correlative standard, and the light concrete made by lightweight aggregates can also fit the standard about the construction material. It was confirmed that the lightweight aggregates made by the arc blade rotary kiln could be used to produce light concrete as coarse aggregates.