Method for baking self-insulating & energy-saving bricks by using domestic sludge and river & lake sludge as raw materials

Abstract

The invention relates to the technical field of manufacturing building wall bricks, in particular to a method for preparing self-insulating & energy-saving bricks by using domestic sludge and river & lake sludge, and the like as raw materials. By using the method, a good deal of sludge, silt and other wastes can be digested, and more other effective resources are not consumed. The method comprises the following steps: 1) piling up the domestic sludge (moisture content: about 85 percent) in the open until the moisture content of the domestic sludge is 50 to 60 percent for later use; 2) mixing domestic sludge (weight percent: 70 to 80 percent; moisture content: 50 to 60 percent), quick lime (weight percent: 2 to 5 percent), gypsum (weight percent: 2 to 5 percent) and foundry waste sand (weight percent: 15 to 20 percent), then piling up the obtained mixture until the moisture content of the mixture is about 35 percent; 3) mixing the mixture (weight percent: 45 to 55 percent) obtained in step 2, the river & lake sludge dried by airing (weight percent: 30 to 40 percent; moisture content: about 10 percent) and slag (weight percent: 5 to 25 percent), then placing the obtained mixture by way of ageing until the moisture content of the obtained mixture is about 20 percent so as to obtain blank materials; and 4) carrying out blank manufacturing and baking the blank materials so as to obtain finished bricks.

Description

technical field [0001] The invention relates to the technical field of manufacturing building wall bricks, in particular to a method for using domestic sludge from various urban discharges, river and lake silt, etc. as raw materials in the preparation of self-insulating and energy-saving bricks. Background technique [0002] At present, environmental protection has become a topic of increasing concern to the governments of various countries. In my country, with the further acceleration of urbanization and the steady development of urban industry, more and more wastes are formed in the city's citizens' lives and business production. How to deal with them? Domestic sludge after domestic sewage treatment, printing and dyeing sludge after printing and dyeing wastewater treatment, foundry waste sand formed by foundry enterprises, and silt formed by dredging rivers and lakes have become serious problems faced by many cities. , river and lake silt also proposed some solutions, such a...

AI Technical Summary

Problems solved by technology

[0003] 1. The Chinese patent application with publication date of March 26, 2008 and publication number CN101148071 "Method for producing light-weight high-strength sintered bricks using urban sludge and wet-discharged fly ash" discloses a method using nearly half of the The method of mixing the urban sludge and more than half of the amount of fly ash plus a small amount of fluxing pore-forming agent to make sintered bricks. This method uses a large amount of fly ash to make bricks, and the reuse of fly ash has been used for many purposes. Widely, such as the manufacture of fly ash cement, fly ash concrete blocks, etc. In many places, fly ash has also become a resource that costs a certain amount of purchase costs. In addition, the amount of sludge treated by this method is small. In this case, this This method of making bricks is not ideal in many cities that urgently need to solve a large amount of sludge

[0004] 2. The Chinese patent application "One-step Comprehensive Utilization of Garbage Sintered Microporous Ecological Bricks" published on August 6, 2008, with publication number CN101234886. This patent document discloses the use of 20-60 parts of domestic garbage or sludge, 10-20 parts of construction waste, 10-20 parts of fly ash, 20-40 parts of excavation spoil or coal gangue, although the amount of garbage used in this method is relatively large, the composition of fresh domestic waste is complex and will inevitably Affecting the quality of bricks, from the several materials used, it is not possible to obtain ecological bricks that meet national standards such as light weight, high strength, sound insulation, heat insulation, and low radioactivity, while construction waste excavation and spoils are not used Brick making is also easy to find other filling uses

[0005] 3. Publication date September 17, 2008, Chinese patent application with publication number CN101265077 "Process of producing energy-saving sintered bricks with silt", the patent document discloses the use of silt with a weight ratio of 10-50% and 50-90% silicon Binder clay or bentonite, etc., the disadvantage is that the urban sludge that can be consumed is relatively limited, and more other effective resources are consumed in order to digest urban sludge

[0006] The main problems of the above-mentioned schemes are: first, the amount of sludge and silt to be treated is not very large; second, it does not take into account the treatment of other common solid wastes that really need to be treated in the city