Technique for using dry discharging carbide slag to completely substitute natural calcareous raw material for producing cement chamotte

Abstract

The invention discloses a method for producing cement clinkers from dried carbide slag completely instead of natural limy materials, which relates to the field of building materials. Firstly, three auxiliary materials (including sand rock, coal ash and sulfur acid residue) are compounded, pulverized and sieved, and the fine powder is fed into a dryer. Then, the carbide slag with a water content less than or equal to 12% is fed into the dryer, and undergoes intensive heat exchange with the hot flue gas at the charge side, realizing complete drying and mixture. The crude material powder is fed into first-stage, second-stage and third-stage cyclone cylinders to undergo multiple suspension heat exchange with the hot flue gas, and then enter a rotary kiln for calcination. The hot flue gas inside the klin undergoes the heat exchange in a pipeline calciner and a wind pipe and then reversely flows into the third-stage, second-stage and first-stage third-stage cyclone cylinders, the dryer, a cyclone dust collector, a system fan and an airbox pulse bag-shaped dust collector sequentially, and the purified gas is discharged into the external atmosphere. The coal powder jets into the calciner at the charge side for further combustion, and the crude material powder undergoes decomposition reactions: Ca(OH)2-H2O+CaO. The clinker burned in the rotary kiln is cooled by a grate cooler and then delivered to a clinker storage room. In the invention, the waste carbide slag is completely dried by using the exhaust gas at the discharge side, and the heat consumption for clinker combustion is reduced by about 25%, thereby realizing energy conservation and exhaust reduction.

Description

1. Technical field: [0001] The dry-discharged carbide slag 100% replaces the natural calcareous raw material to produce cement clinker and belongs to the field of building materials. 2. Background technology: [0002] The invention patent with the application number of 200610146907.4 "100% Substitution of Calcium Carbide Slag for the Production of Cement Clinker by External Decomposition of Natural Calcareous Raw Materials" discloses a method of producing cement clinker by using calcium carbide slag as the main raw material and by external decomposition of the kiln. The ratio of raw materials is: carbide slag 75.05%, silica 11.84%, steel slag 8.31%, fly ash 4.80%. Since the water content of the main raw material calcium carbide slag is less than or equal to 37%, this method has the following disadvantages: [0003] (1) Since the chemical plant adopts the wet method to produce acetylene, the waste slag produced by the acetylene production unit-calcium carbide slag generally...

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Problems solved by technology

[0005](3) Since the moisture content of calcium carbide slag entering the kiln is ≤37%, it needs to be dried and dehydrated first, and the heat consumption per kilogram of carbide slag increases by 940kj, and the heat consumption of the whole system increases 25%

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