Sludge autoclaved brick and preparation method thereof

Abstract

The invention discloses a sludge autoclaved brick. The sludge autoclaved brick comprises the following raw material components in parts by weight: 20-60 parts of sludge dehydrated mud cakes, 11-25 parts of first fly ash, 0-10 parts of carbide slag or first lime, 22-39 parts of furnace slag and 1-6 parts of a reinforcing agent, wherein the sludge dehydrated mud cakes comprise the following raw material components in parts by weight: 33-66 parts of sludge, 15-33 parts of second fly ash, 15-33 parts of second lime and 1-5 parts of a coagulating agent. The autoclaved brick is prepared from industrial wastes as main raw materials, and is low in energy consumption, non-sintered, safe, healthy and stable for a long time. The invention also discloses a preparation method of the sludge autoclaved brick. According to the preparation method, the sludge water content is controlled in a mode of conditioning at first and then dehydrating to form the sludge dehydrated mud cakes, and the fly ash and the like are added to perform hydration reaction. The autoclaved brick prepared by the method can meet performance requirements of a standard brick, and the production process is simple, low in energy consumption and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of sludge resource utilization, in particular to a sludge autoclaved brick and a preparation method thereof. Background technique [0002] Sludge is a type of waste that is distinguished from both liquid and solid wastes because of its slurry-state characteristics of liquid-solid phase mixture. It not only has the characteristics of a slurry when it is produced, but also has a certain stability in its liquid-solid mixed state. Usually, it can only separate solid and liquid when a great external force (physical, chemical) is applied. At the same time, the sludge has a high water content, is not easy to dehydrate, contains hydrophilic substances in a colloidal structure, and has a high content of organic matter, is perishable and smelly, and contains various pathogenic bacteria. If a large amount of untreated sludge is randomly stacked and discharged, it will not only cause new pollution to the environment, b...

AI Technical Summary

Problems solved by technology

However, the existing sintered bricks are not easy to obtain materials, the production process is complicated, and the energy consumption is high. The production process will produce harmful gases and cause great potential pollution to the atmosphere. my country's National Wall Reform Office has requested that all cities in the country ban the use of clay bricks in 2010. At the same time strictly restrict the fired brick project

Furthermore, the existing sintered brick process has a poor dehydration effect on sludge cakes, and the moisture content after dehydration is still high, at least 80%. In this way, the sludge sludge cakes are easy to form agglomerates during the mixing process of the brick making process. The resulting "weak point" in the strength of the adobe, coupled with other traditional raw materials, the resulting sludge brick has poor performance and cannot be widely used in wall materials, municipal engineering, slope protection bricks and other fields

Images