Municipal sludge expanded ceramsite and preparation method thereof

Abstract

The invention provides municipal sludge expanded ceramsite and a preparation method thereof. The municipal sludge expanded ceramsite is prepared from the following materials by mass percentage: 20% to 45% of municipal sludge, 50% to 70% of shale, tailings or clay, 1% to 5% of organic matter and 1% to 5% of iron powder, wherein, the tailings is one of pyrite tailings, gold tailings, lead-zinc tailings and aluminum tailings; and the organic matter is sawdust. The preparation method comprises the following steps: feeding the shale, tailings or clay into a crusher, and carrying out the screening treatment; adding and mixing the municipal sludge, the organic matter and the iron powder, feeding into an ageing silo and stirring; then, feeding into a granulating machine, granulating and calcinating in a rotary kiln; and finally, cooling and stacking the calcinated ceramsite by classification. By using a great amount of municipal sludge, the invention is resource-saving and environment-friendly; compared with the original cost, the overall cost of a building is reduced by 5% to 10%; and the prepared expanded ceramsite has the advantages of light weight, fire resistance, sound absorption, good heat insulating and preserving performance, simple process and low cost, so that the invention is suitable for industrialized production.

Description

Technical field

[0001] The invention belongs to the technical field of building materials, and relates to a city sludge expanded ceramsite and a manufacturing method thereof. Background technique

[0002] At present, the ceramsite used in construction is mainly made of clay, shale, etc. as raw materials, and is produced through the process of measuring, aging, mixing, granulating, and returning to the brick kiln. It has the characteristics of light weight, high strength, energy saving and heat preservation, but, Need to consume a lot of clay and shale resources, destroy vegetation and destroy farmland at the same time. With the acceleration of urbanization, the sludge produced by urban sewage treatment throughout the country is as high as 12 million tons per year, and it is increasing at a rate of 15% per year. A large amount of sludge is mainly disposed of by landfill and other measures, which will cause secondary pollution to groundwater. . Therefore, exploring the treatment ...