Sewage sludge shale ceramic particle and preparation method thereof

Abstract

Sewage sludge shale ceramsite and a preparation method thereof are provided, which relates to the light energy-saving ceramsite of building materials and a preparation method thereof. The ceramsite of the invention consists of sewage sludge, shale and admixtures; the method of the invention uses the sewage sludge, the shale and the admixtures as raw materials; first, the shale is grinded into shale powder and then the sewage sludge, the shale and the admixtures are mixed and wedged to be granulated into round particles and then enter into a kiln; the products are obtained after going through drying, preheating, barking and being taken out of the kiln for cooling. The ceramsite employs the sewage sludge discharged directly from sewage treatment plants and the shale as major materials, which greatly saves land resource and partial shale mine resource and provides an extremely good way for the non-hazardous and reclaiming treatment of sewage sludge; the method of the invention is simple, energy-saving and resources-saving and the density rank of the ceramsite is 300-700. The ceramsite of the invention can be widely applied in lightweight aggregate bricks, lightweight aggregate sheet materials, lightweight aggregate concrete, etc. and can also be taken as the filter material of sewage treatment, the water-retaining agent in cultivation, etc.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to ceramsite for light-weight and energy-saving building materials and a preparation method thereof. Background technique [0002] Ceramsite is made of clay, shale, fly ash, etc. as raw materials, processed into a spherical shape, and then rapidly roasted and expanded at high temperature. It is a light aggregate with a certain strength and a honeycomb porous interior. Ceramsite can be used to produce light aggregate concrete, concrete blocks and other building materials. Concrete products using ceramsite can significantly reduce the self-weight of buildings, enhance the earthquake resistance of buildings, significantly improve the thermal insulation performance of buildings, and greatly reduce The energy consumption of buildings, etc. Among them, the better the lightweight performance of ceramsite, the greater the reduction in the weight of the building, and t...

AI Technical Summary

Problems solved by technology

At present, my country's light ceramsite products are mainly clay ceramsite. Although relatively light ceramsite can be produced with clay as raw material, it will consume a lot of clay resources and destroy cultivated land, which is not in line with the national policy of protecting cultivated land. At present, some ceramsite manufacturers with clay as the main raw material have less and less room for development, and have even ceased production.

In addition, although fly ash ceramsite with fly ash as the main raw material can recycle a large amount of waste, ceramsite products have high water absorption rate and low expansion rate, so it is difficult to produce high-quality lightweight ceramsite

The ceramsite fired purely from shale has strict requirements on the quality of shale ore, high swelling temperature, low expansion rate, high production energy consumption, and low economic and technical benefits

For example, the "ultra-light shale ceramsite" patent with the publication number CN 1413952A discloses a production method for ultra-light ceramsite using shale alone as a raw material. Although the ceramsite bulk density produced by it is very small, the Raw material composition requirements are strict, and the chemical composition requirements of shale are: SiO 2 56.2~59.1%, Al 2 o 3 15.7~17%, Fe 2 o 3 7.2-8.1%, CaO 3.1-4.3%, WgO 2.5-3.2%, SO 3 0.04-0.06, the loss on ignition is 7.9-8.3%, the total amount of clay mineral components is required to be greater than 40%, the requirements for shale composition are very narrow, and there is no universal applicability. In addition, it needs to add 10-12% of Moisture, consumes water resources, the total water content should be controlled to 40-45%, the total water content is too high, and the firing temperature is as high as 1300℃-1450℃, which makes the firing in the kiln consume a lot of energy

There have also been some reports on the preparation of ceramsite from sewage (silt) mud, but because the water content of sewage (silt) mud itself is very high, there are dehydration and drying processes in general preparation methods.

For example, the patent of "silt ceramsite and its preparation method" with the publication number CN 1149038A, the disclosed preparation method requires natural dehydration, mechanical dehydration, drying and other processes, which increases the requirements for raw material storage yards and heat energy consumption

Another example is the patent of "Method for producing garbage ceramsite and sludge ceramsite" with publication number C04B 18 / 30. The production method of sludge ceramsite also requires natural dehydration and mechanical dehydration process, and it is required to reach the water content of sludge. rate≤35%, and it needs to be mixed with clay, which will consume a certain amount of clay resources