Method for baking ceramsite by using town sludge, river mud and bentonite

Abstract

The invention discloses a method for baking ceramsite by using town sludge, river mud and bentonite. The method comprises the following steps of: milling 30 to 35 weight percent of original sludge, 45 to 50 weight percent of river sludge, and 17 to 23 weight percent of bentonite by wheels, mixing and stirring to homogenize the materials; and aging, pelleting, screening, sintering and expanding, and performing air cooling. The bulk density of the obtained ceramsite is 400 to 500Kg/m<3>, the compression strength is 1 to 3.5Mpa, one-hour water absorption is 8 to 10 percent, and the grain size of the product is 1 to 26mm; and the original sludge, the river sludge and the bentonite are used as the raw materials, the ceramsite is directly baked by taking cavings as fuel, the treatment capacity of the sludge is large, the production cost is low, secondary pollution in the production process is avoided, and the performance of the obtained ceramsite product meets the standard requirement of GB/T17431.1-1998.

Description

Technical field: [0001] The invention relates to a firing method for producing ceramsite, in particular to a method for firing ceramsite by using urban raw sludge, river silt and bentonite. Background technique: [0002] According to incomplete statistics, the daily sewage treatment capacity in the country is about 300 million m 3 Sludge is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles containing heavy metals, and colloids. The main characteristics are high water content, high organic content, easy to rot and smell, fine particles, colloidal liquid, it is a thick substance between liquid and solid, and cannot be separated from solid and liquid by precipitation. Because the sludge produced by urban sewage and wastewater treatment is rich in many pollutants, the treatment cost is very high, and casual disposal will cause secondary pollution and sequelae. It has become a technical bottleneck restricting the development...

AI Technical Summary

Problems solved by technology

[0011] Although there is a method for firing ceramsite using sludge or river sludge in the prior art, the existing method can only use dry sludge or river sludge alone, and the original sludge must be dehydrated and dried first, and then powdered coal ash, limestone, clay and other raw materials for firing, and some need to add ceramsite proppant to fire

The dehydration and drying treatment of sludge is not only costly, but also during the sludge dehydration and drying process, the volatilization of sewage odor in the sludge will lead to secondary pollution of the air at the treatment site, producing SO 2 , directly affect people's normal life and health, and clean water must be added during the mixing process, which consumes a lot of heat energy and water, and the cost of ceramsite firing is too high, which is very uneconomical. The ability to deal with sludge is also limited, so it is difficult to popularize and apply