Method for producing portland cement clinker using domestic waste incineration residue

Abstract

The invention discloses a method for producing Portland cement clinker with incineration slag of municipal solid waste. The method is to mount a by-way air exhaust device on the prior novel cement kiln so as to solve the problem of crust and blockage caused by chlorine brought into the kiln by the slag. For a kiln system with a kiln row and a furnace row which are independent from each other, the by-way air exhaust device is arranged in an uptake of a kiln end gas chamber in the kiln row close to a five-stage cylinder; while for common industrial kiln, the air exhaust device is arranged between an outlet of decomposing furnace and an inlet of the five-stage cylinder or arranged at an uptake of an outlet of the five-stage cylinder. The use frequency of the by-way air exhaust device is between once per eight hours and once per three days, the temperature of the air entering the by-way air exhaust device is controlled to be more than 950 DEG C. The method is simple in process, low in treatment cost, and complete in toxicity removal due to the fact that heavy metals in the slag are solidified in the Portland cement clinker and are solidified in hydrates during the hydration of the mineral compositions of the Portland cement clinker. The method contributes to the development of cyclic economy and reduces the consumption of natural resources and energy of the cement industry.

Description

Technical field [0001] The invention relates to a method for producing Portland cement clinker, in particular to a method for producing Portland cement clinker by using domestic waste incineration slag. The method utilizes domestic waste incineration slag through resource utilization of cement industrial kilns. Background technique [0002] Domestic waste incineration power generation is currently one of the main ways to treat domestic waste in developed areas at home and abroad. Incinerator slag is a by-product of municipal solid waste incineration power plants. Each ton of solid waste burned produces about 0.2 tons of slag (also called bottom ash), which includes the residual incineration residue on the grate and the particulate matter falling from the grate. The incinerator slag contains a certain amount of heavy metals such as Cd, Hg, Pd, As, Cr, Se, Zn and more alkali metal ions (K + , Na + ) And chloride ions, most of which have heavy metal content exceeding the limit for C...

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Problems solved by technology

There are following deficiencies in the existing slag comprehensive utilization technology: (1) because the slag contains unburned plastic bags, cloth strips, wood, and larger bricks and glass, and has a certain smell, the smell has a certain smell. Therefore, the slag needs to be sorted and deodorized before the implementation of the above-mentioned resource utilization technology. The process is complicated and the treatment cost increases; Reports, studies and solutions of chloride ions on concrete durability (such as steel bar corrosion, alkali-aggregate reaction, etc.); The damage to the durability of the product, and the slag does not have pozzolanic activity, so it can only be used as an inert mixture. When it is mixed in a large amount, it will easily cause a sharp drop in cement performance; (3) It is used in the manufacture of floor tiles in large amounts, and there is no heavy metal dissolution in its products. The research and reports of heavy metal dissolution on surface water and groundwater are more worrying.

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