Environment-friendly baking-free brick prepared from sludge and furnace slag and preparation method thereof

Abstract

The invention discloses an environment-friendly baking-free brick prepared from sludge and furnace slag. Raw materials include: sludge, domestic incinerator slag, cement, a curing agent and water in amass ratio of (35-40): (10-15): (40-50): (5-10). The preparation method comprises the following steps: carrying out pyrohydrolysis and thermophilic anaerobic digestion treatment on raw sludge, and dehydrating to obtain dehydrated sludge; adding a deodorant into the dehydrated sludge, naturally deodorizing and airing, then crushing, sieving with a 100-mesh sieve to obtain sludge powder, and sieving the domestic incinerator slag with a 50-mesh sieve to obtain slag particles; and mixing the sludge powder and the slag particles with Portland cement, a curing agent and water, putting the obtainedmixture into a mold, performing extrusion and compression molding, and performing maintenance in air so as to obtain the environment-friendly baking-free brick. Waste sludge and furnace slag can be used as raw materials to prepare the environment-friendly baking-free brick which is stable in property, free of pollution and capable of meeting the strength requirement.

Description

technical field [0001] The invention relates to the field of waste recycling, in particular to an environment-friendly burning-free brick prepared by utilizing sludge and slag and a preparation method thereof. Background technique [0002] With the rapid development of the economy, the shortage of energy and the increasingly prominent problems of environmental pollution, the development of a green economy that is energy-saving and environmentally friendly is the focus of economic development, and the recycling of waste is also an important part of the green economy. [0003] Slag is a by-product of domestic waste incineration, and its leached heavy metals and dissolved salts are relatively low in concentration, so it is a waste of resources to be discarded directly. Sludge is the waste produced in the process of sewage treatment. Because it contains a large amount of organic and inorganic substances, it is difficult to treat. If it is directly discarded as solid waste, it is...

AI Technical Summary

Problems solved by technology

[0003] Slag is a by-product of domestic waste incineration, and its leached heavy metals and dissolved salts are relatively low in concentration, so it is a waste of resources to waste directly

Sludge is the waste produced in the process of sewage treatment. Because it contains a large amount of organic and inorganic substances, it is difficult to treat. If it is directly discarded as solid waste, it is often prone to secondary pollution. At present, sludge is used to prepare environmentally friendly bricks. However, the existing sludge brick-making process has the following defects: (1) Most of the brick products popular in the market are fired bricks, which will produce high pollution such as smoke during the production process, and consume a lot of energy; (2) Unburned bricks made of ordinary sludge as brick-making raw materials are often not strong enough, and are likely to cause secondary pollution to the environment, and chemicals are often added in the process of making environmentally friendly bricks; (3) Existing sludge-made unburned bricks The process mainly uses fly ash and other materials as aggregates. Fly ash is the main solid waste discharged from coal-fired power plants. It is easy to generate dust during the brick-making process and pollute the atmosphere.