Production process for manufacturing cement clinker by using cobblestones

Abstract

The invention relates to the technical field of cement preparation, in particular to a production process for manufacturing cement clinker by using cobblestones. The production process comprises the following steps: crushing and homogenizing the cobblestones, clay, coal gangue and a ferrous material by using a mill, and controlling the particle size of the cobblestones fed into a pile to be 60 cm; grinding the formed raw material by using a raw material grinding system, and controlling the ground raw material to be less than or equal to 18.0% and the water content of the raw material to be less than or equal to 0.5%; and conducting treatment by using a combustor, wherein the pressure of a primary fan is controlled to be about 25000 Pa, the internal flow opening degree of the combustor is controlled to be 25%, and the clearance opening degree of a tertiary air gate plate is controlled to be 50 cm, so flame length is extended, and calcining firepower intensity in front of a kiln is improved. The production process overcomes the problems that yield is low, raw materials are easy to wear and poor in burnability, and a clinker is difficult to calcine when the cobblestones are used for replacing limestone to serve as a raw material for firing the clinker.

Description

technical field [0001] The invention relates to the technical field of cement preparation, in particular to a production process for making cement clinker from pebbles. Background technique [0002] In the production of cement clinker, limestone is one of the important raw materials, but the reserves of limestone mines are limited and the grades are not uniform. Most companies are looking for and developing new alternative raw materials. The mining waste residue of the sand and gravel plant is cobblestone, in which the CaO content is about 40.0%-49.0% on average, and the SiO 2 The content is between 5.0% and 15.0%, and it has raw material characteristics such as high impurity content and more crystalline silicon. It can be used in batching to produce cement clinker. [0003] However, due to the high hardness of cobblestone and its poor grindability compared with limestone, it has low output, poor grindability and burnability of raw material, and difficult calcination of c...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to aim at the defects and deficiencies of the prior art, to provide a production process for making cement clinker with pebbles, which solves the problems of low output, easy grinding of raw materials and problems when using pebbles instead of limestone as raw materials for firing clinker. Problems of poor burnability and difficulty in clinker calcination