Description
Cement production line is mainly composed of crushing equipment, pre-homogenization equipment, raw material preparation homogenization, preheating decomposition, cement clinker firing, cement grinding packaging and other processes. The so-called pre-homogenization is the cement production process, most of the raw materials to be broken, such as limestone, clay, iron ore and coal. Limestone is a large amount of cement production of raw materials, mining after the grain size is large, high hardness, so limestone crushing in the cement plant material crushing occupies a relatively important position. On the other hand, in the process of storage and retrieval of raw materials, the use of scientific stacking technology to achieve preliminary homogenization of raw materials is that the raw material pile has the function of storage and homogenization at the same time.
Process
1, cement production line crushing and pre-homogenization
(1) In the production process of broken cement, most of the raw materials should be broken, such as limestone, clay, iron ore and coal. Limestone is the raw material used in the production of cement, the grain size after mining is larger, the hardness is higher, so the crushing of limestone occupies a relatively important position in the crushing of cement plants.
(2) Pre-homogenization of raw materials Pre-homogenization technology is to use scientific stacking and taking technology to achieve preliminary homogenization of raw materials in the process of storage and taking of raw materials, so that the raw material yard has the function of storage and homogenization at the same time.
2, cement production line raw material preparation
Cement production process, each production of 1 ton of Portland cement to grind at least 3 tons of materials (including various raw materials, fuel, clinker, mix, gypsum), according to statistics, dry cement production line grinding operation needs to consume more than 60% of the power of the plant, of which raw material grinding accounted for more than 30%, coal grinding accounted for about 3%, cement grinding accounted for about 40%. Therefore, reasonable selection of grinding equipment and process, optimization of process parameters, correct operation and control of operation system are of great significance to ensure product quality and reduce energy consumption.
3, cement production line raw material homogenization
In the process of new dry cement production, the stable raw material composition is the premise of the stable clinker firing thermal system, and the raw material homogenization system plays the role of the last check on the stable raw material composition.
4, cement production line cement clinker firing
After the raw material is preheated and predecomposed in the cyclone preheater, the next step is to enter the rotary kiln for clinker firing.
In the rotary kiln, the carbonate is further decomposed rapidly and a series of reactions occur to produce isominerals in the cement clinker. As the temperature of the material rises, the mineral will become liquid and react to produce a large amount of clinker. After the clinker is fired, the temperature begins to drop. The cement clinker cooler cools the high temperature clinker discharged from the rotary kiln to the temperature that can be borne by the downstream conveying, storage and cement mill. At the same time, the waste heat of the high temperature clinker is recovered to improve the thermal efficiency and clinker quality of the system.
5, cement production line cement grinding
Cement grinding is a process of cement manufacturing, but also a process that consumes more electricity. Its main function is to grind the cement clinker (and gelling agent, performance adjustment materials, etc.) to the appropriate particle size (expressed in fineness, specific surface area, etc.) to form a certain particle composition, increase its hydration area, accelerate hydration speed, and meet the requirements of cement slurry condensation and hardening.
Advantage
1. Large crushing ratio, simple operation and reliable performance.
2, save resources, essentially create time and labor saving for users, and try to improve the interests of users
3, the equipment has a high degree of automation, saving time and improving production efficiency.