How cement is formed and how cement is formed

After the silicate and aluminate are mixed and burned in the blast furnace to the melting state, the rock will undergo very complex chemical changes at high temperatures, the semi-finished products formed by this process are called clinker, and then the clinker and some fillers are ground into powder in the ball mill, which becomes cement, generally speaking, one ton of clinker can produce 3 tons of PO325 cement.

If you break the stone, burn it again, burn it, burn it, and it will become cement!

Cement is made of limestone, clay and silica as the main raw materials, which are crushed, batched and ground to make raw meal, fed into the cement kiln to calcine the mature material, and added an appropriate amount of gypsum (sometimes mixed with mixed materials or admixtures) to grind finely.

The production of cement can generally be divided into three processes: raw meal preparation, clinker calcination and cement making of empty reed potatoes.

1. Raw meal grinding.

There are two types: dry and wet. The dry method generally adopts a closed-circuit operating system, that is, after the raw materials are ground by the mill, they enter the separator for sorting, and the coarse powder flows back into the mill and then grinds the operation, and most of the materials are dried and ground in the mill at the same time, and the equipment used includes tube mill, intermediate unloading mill and roller mill. The wet process usually uses an open-circuit system such as a tube mill or a baseball mill that does not return through the mill at one time, but there are also closed-circuit systems with classifiers or arc screens.

2. Calcination.

There are two main types of equipment for calcining clinker: vertical kiln and rotary kiln, vertical kiln is suitable for small production scale factories, and large and medium-sized factories should use rotary kiln.

3. Grinding. <>

Fine grinding of cement clinker is usually carried out using a coil-flow grinding process (i.e. closed-circuit operating system). In order to prevent dust from flying in production, cement chain factories are equipped with dust collection equipment. Electrostatic precipitators, bag collectors and cyclone dust collectors are commonly used dust collection equipment in cement plants.

The production process of Portland first rotten cement is representative in cement production, which is made of limestone and clay as the main raw materials, which is made into raw meal by crusher, batching and grinding, and then fed into the cement kiln to calcine the mature material, and then the clinker is finely ground with an appropriate amount of gypsum.

Cement production can be divided into dry and wet according to the different raw meal preparation methods. Dry production, the raw materials are dried and ground at the same time, or dried and ground into raw meal powder and then fed into the dry kiln to calcine the mature material. Wet production, the raw materials are mixed with water powder and ground into raw meal slurry, and then fed into the wet kiln to calcine the mature material.

The production of cement can generally be divided into three processes: raw meal preparation, clinker calcination and cement making, and the whole production process can be summarized as two grinding and one burning.

1. Raw meal grinding is divided into two types: dry method and wet method. That is, after the raw materials are ground by the mill, they enter the separator for sorting, and the coarse powder flows back into the mill and then grinds;

2. Clinker calcination, calcining clinker equipment mainly includes vertical kiln and rotary kiln, vertical kiln is suitable for small production scale of factories, large and medium-sized factories should use hand rotary kiln;

3. Cement grinding, the fine grinding of cement clinker usually adopts the circle flow grinding process. The calcined clinker is calcined into a finished cement product.

Cement is finely ground and mixed by limestone, clay and iron ore powder in proportion, and then calcined, the general temperature is about 1450 degrees, and the calcined product is ground fine with gypsum, and cement is formed by mixing it in proportion. After the cement is mixed with water to form a slurry, it can be hardened in air or water, and can firmly cement sand, stone and other materials together.

How cement is madeCement is very common in life, like the bridges, houses, roads, etc. built have the credit of cement. So how is cement made? Cement is finely ground and mixed by limestone, clay and iron ore powder in proportion, and the mixture at this time is called raw meal.

Then calcination is carried out, the general temperature is about 1450 degrees, and the product after calcination is called clinker. Then the clinker and gypsum are ground together and mixed in proportion to be called cement.

Principle of cement solidification and hardeningAfter the cement is mixed with water to form a slurry, it can be hardened in air or water, and can firmly cement sand, stone and other materials together. This is because the substances in the cement react with water, and some small crystals are formed to wrap on the surface of the cement particles in the early stage, and these fine crystals are bonded together by a small attraction, thus forming a network structure, called a solidified structure, because this structure is formed by the disorderly connection of a very small attraction, so the strength of this structure is very low, and it has obvious plasticity.

Cement is made of calcareous (such as limestone, by sheng, marl limestone, etc.) and clay (such as clay, marl clay, etc.) raw materials, according to the appropriate proportion of raw meal, at high temperature (1300 1450) burning to partial melting, the obtained clinker with calcium silicate as the main component, add an appropriate amount of gypsum, ground into a fine powder surface made of hydraulic cemented material.

Cement is mainly made from a mixture of limestone, clay, gypsum and other auxiliary materials. The process usually involves the following steps:

Gathering raw materials: Limestone and clay are often the most important raw materials in cement production, they are excavated and then sent to cement plants for processing.

Crushing and mixing raw materials: Raw materials are crushed and mixed within the cement plant to obtain the desired chemical composition.

Calcination: The mixed raw materials are fed into a cement kiln for high-temperature calcination. In this process, the raw materials undergo a chemical reaction that produces new compounds, the most important of which is clinker.

Clinker is the most important intermediate product in cement production and is usually a powdery grey substance.

Grinding: The clinker is sent to a mill for grinding to obtain the desired particle size and surface area.

Addition of gypsum: Finally, the gypsum is added to the finely ground clinker to regulate the setting time and hardening process of the cement. The cement is then packed and transported to where it needs to be used.

It should be noted that different types of cement may differ in the selection of raw materials and in the production process. Clever Manuscript Town.