Method for preparing baking-free brick by utilizing sludge

Abstract

The invention relates to a method for preparing a baking-free brick, in particular to a method for preparing a baking-free brick by utilizing sludge. According to the method, the technical problems that a mud brick produced in the prior art is poor in water absorption rate, durability and environmental corrosion resistance and long in brick curing period, the additive amount of shale and sludge is large, the sludge stability is poor and bad smell is generated are solved mainly. A mud water separation device is used, the moisture content of the sludge is reduced to 20-30%; the sludge is placed in a sludge reaction tank to undergo fermentation drying, the sludge is smashed, coarse particles of 10 mm or above are screened out and then the sludge is stirred and cured; a curing agent is added into dehydrated sludge, and after the sludge is evenly stirred, the sludge reaches a normal temperature state; building rubbish, power plant ash deposits, cement and a sufficient amount of water are added, the mixture is aged and undergoes secondary stirring, a die is added to perform vibration, filling and leveling up and pressurization, steam curing is performed after demolding, and the finished product baking-free brick is obtained after natural curing.

Description

technical field [0001] The invention relates to a method for preparing unburned bricks, in particular to a method for preparing unburned bricks from sludge. Background technique [0002] The banks and rented farmland where a large amount of sludge is piled up after river dredging will cause secondary environmental pollution. If dredging efforts are to be intensified, the way out of the river sludge must be resolved, and the new sewage sludge should be used as a resource. Utilization is very necessary. A Chinese patent discloses a method for firing self-insulating and energy-saving bricks using domestic sludge and river and lake silt (publication number: CN101935199A), which has the following process: the domestic sludge with a moisture content of about 85% is naturally stacked to a moisture content of 50% -60% is for use; the domestic sludge with a water content of 50-60%, 2-5% quicklime, 2-5% gypsum and 15-20% foundry waste sand of 70-80% by weight are passed through Stir...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for preparing non-fired bricks from sludge, which mainly solves the existing problems in the prior art, such as poor water absorption rate of mud bricks, poor durability of bricks, and poor corrosion resistance to the environment. The maintenance period is long, and at the same time, the amount of shale and sludge added is large, the stability of the sludge is poor, and it will produce technical problems such as odor

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