Cement clinker calcined on mechanical shaft kiln and preparation method thereof

Abstract

The invention discloses a high-quality cement clinker burnt on a mechanical shaft kiln by applying industrial waste residues instead of non-renewable material and a preparation method thereof. Carbide slag, furnace slag and fly ash are grinded and homogenized to be added into a pre-feed water ball-shaped system, so as to form pellets with average particle diameter of Phi5 to Phi10mm; then the pellets are sent to the mechanical shaft kiln and burnt into the high-quality cement clinker. The invention makes full use of the furnace slag, fly ash and dry carbide slag which are three waste residues difficult to treat in industrial production as the main materials for producing cement, thus greatly increasing the content of the furnace slag and the carbide slag in manufacturing cement, and the produced cement clinker has higher quality; in addition, the invention changes waste into valuable matters, which is beneficial for reducing production cost and for environmental protection with remarkable economic and social benefits.

Description

technical field [0001] The invention relates to the field of building materials, in particular to calcining high-quality cement clinker in a shaft kiln by replacing all non-renewable raw materials with industrial waste slag and a preparation method thereof. Background technique [0002] Cement is an essential material in the construction industry. The main mineral composition of general-purpose Portland cement clinker is tricalcium silicate (3CaO·SiO 2 ), dicalcium silicate (2CaO SiO 2 ) Tricalcium aluminate (3CaO·Al 2 o 3 ), tetracalcium aluminoferrite (4CaO·Al 2 o 3 · Fe 2 o 3 )). There are mainly four kinds of oxides, namely calcium oxide (CaO), silicon oxide (SiO 2 ), alumina (Al 2 o 3 ), iron oxide (Fe 2 o 3 ). The content of each oxide has a very important influence on the properties of cement, so it is necessary to find suitable raw materials to meet the requirements when preparing raw materials. But in nature, it is difficult to find...

AI Technical Summary

Problems solved by technology

[0017] The ratio of these raw materials is difficult to determine. For example, due to the high content of CaO in calcium carbide slag, if the amount of CaO is too large in the production of mechanical shaft kiln, the content of CaO in the raw meal will be too high, not only the water required for pelleting will increase greatly, The quality of the balls will decrease, and it will cause high free calcium oxide in clinker, which will seriously affect the stability of cement; if the dosage is too small, the CaO content will be low, the clinker leaving the kiln will be severely pulverized, and the secondary free calcium oxide will be high. High, affecting cement stability

Calcium carbide slag particles are small, the calcination reaction is fast, and the charcoal in the slag burns for a long time. If the slag is too large, the primer will be elongated, and the cooling effect is not good. Clinker C 3 S crystallization is incomplete, even decomposed, C 2 S is easy to pulverize, resulting in low strength and poor stability; if the proportion is too small and the firing heat is insufficient, the clinker will be underburned and the reaction will be incomplete, resulting in low strength and poor stability.