Method for producing cement cementing material through industrial waste residue sludge

Abstract

The invention relates to a method for producing a cement cementing material (called cementing material for short) through industrial waste residue sludge. According to the method, sludge and alkali residues which are completely discharged after the sewage of the biologicalization, printing and dyeing and the like of a sewage treatment plant is treated are treated into the cementing material by virtue of the steps of pelleting, low-temperature calcination and the like after being mixed in a certain proportion, a right amount of gypsum powder is added to be ground into the cementing material, the cementing material can be coagulated and hardened in air and water, and the hydraulic cementing material with high activity can be directly used for the construction of dam building engineering, underwater building engineering, road building engineering, bridge building engineering, civil building engineering and the like; a small amount of other materials can also be added to be ground into a high-standard sludge cementing material. The method disclosed by the invention can be used for effectively overcoming the defects of the traditional treatment modes of stacking, backfilling, incineration and the like which extremely easily cause secondary pollution, and also overcoming the defects of increased energy consumption, reduced production efficiency, and the like caused by directly roasting high-temperature cement clinker, is a very good treatment method which has the advantages of low energy consumption, advancement and reasonability in process and no secondary pollution, can be used for obviously enhancing the quality and property of abrasion resistance and the like of cement and reducing the cost of the cement, is beneficial to environmental conservation, can be used for producing the sludge and the alkali residues into the cementing material, and the like.

Description

technical field [0001] The present invention relates to a sludge cementitious material (abbreviated as cementitious material) produced with industrial waste sludge as the main raw material, especially the sludge discharged from sewage treatment plant biochemical, printing and dyeing sewage as the main raw material. A production method for producing a hydraulic sludge cementitious material capable of coagulation and hardening in both air and water with high activity and its harmless and weight reduction treatment belongs to the field of environmental protection or cement. Background technique [0002] With the rapid development of my country's urban and rural industries, the discharge of sludge has increased sharply, with an annual discharge of 200 million tons, while the developed and utilized sludge only accounts for about 10% of the discharged sludge, resulting in a large amount of sludge accumulation. Unused sludge stacking not only takes up a lot of land, but also serious...

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Problems solved by technology

It contains nitrogen, phosphorus, and potassium needed for plant growth and development, various trace elements to maintain normal plant development, and organic matter that can improve soil structure. It also contains chromium, substances that can cause people to develop cancer, and other toxic and Different types of parasites and other harmful ingredients have a water content of 70-80%, so it is very difficult to develop and utilize

[0004] In order to deal with these sludges, in order to turn waste into wealth and eliminate public hazards, many people at home and abroad have thought of many ways. The main methods are landfilling, stacking, throwing the sludge into the ocean, burning, composting, etc. Now there are also People use sludge to prepare and burn high-temperature cement clinker. This method needs to be calcined in a cement kiln to a high temperature of 1500 degrees before it can be sintered into cement clinker, which increases energy consumption and reduces production efficiency. The effect of reducing costs is not great, no matter how to deal with the above, there will inevitably be secondary pollution problems, and the investment cost is also large

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