Case introduction

The grinding production line we designed is composed of jaw crusher, bucket elevator, electromagnetic vibrating feeder, grinding main machine, auxiliary machines, fans, dust removal equipment, centralized electronic control and other equipment. According to the user's needs, the main machine of the grinding production line can be equipped with Raymond mill, high-pressure suspension roller mill, three-ring medium-speed micro-powder mill, etc. The equipment configuration of the grinding production line is mainly determined based on the customer's grinding raw materials, output and finished product usage. We provide comprehensive pre-sales, sales and after-sales services, configure the process based on the customer's production site, and strive to provide the most reasonable and optimal configuration for customers. Economical grinding production line.

Case advantages

1. High output, low cost, durable and low efficiency

Under the same fineness condition, it requires less investment than airflow mill. The wearing parts are made of good wear-resistant materials and have a long service life. The entire production line has many advantages such as low cost and high efficiency.

2. The grinding production line is highly complete

Whether it is the processing and transportation of raw materials or powdering and final packaging, it can form an independent production system. This is something that other grinding mills cannot achieve, and it has a good user experience, large output, low investment but great benefits. High, which can save customers a lot of infrastructure funds.

3. Good sealing, green production

The sealing of the entire production system has been optimized and upgraded to fully capture dust, reduce noise decibels, and achieve green grinding.

Production Process

1. Crushing and pre-homogenization

(1) Crushing: In the cement production process, most raw materials need to be crushed, such as limestone, clay, iron ore and coal. Limestone is the raw material used in cement production. After mining, the particle size is larger and the hardness is higher. Therefore, the crushing of limestone plays an important role in the material crushing of cement plants.

(2) Pre-homogenization of raw materials: Pre-homogenization technology is to use scientific stacking and retrieval technology to achieve preliminary homogenization of raw materials during the storage and retrieval process of raw materials, so that the raw material yard has both storage and homogenization capabilities. function.

2. Raw material preparation

In the cement production process, at least 3 tons of materials (including various raw materials, fuels, clinkers, mixtures, and gypsum) must be ground for every ton of Portland cement produced. According to statistics, the grinding operation of dry cement production lines The power required accounts for more than 60% of the power of the whole plant, of which raw meal grinding accounts for more than 30%, coal grinding accounts for about 3%, and cement grinding accounts for about 40%.

3. Homogenization of raw materials

In the production process of new dry process cement, stabilizing the composition of the raw meal entering the pit is the prerequisite for stabilizing the thermal system of clinker firing. The raw meal homogenization system plays a check role in stabilizing the composition of the raw meal entering the pit.

4. Preheating and decomposition

The preheating and partial decomposition of the raw meal is completed by the preheater, replacing part of the functions of the rotary kiln to shorten the length of the return kiln. At the same time, the gas and material heat exchange process is carried out in the kiln in a stacked state and moved to the preheater. It is carried out in an internal suspended state, so that the raw material can be fully mixed with the hot gas discharged from the kiln, which increases the gas-material contact area, has fast heat transfer speed and high heat exchange efficiency, thereby improving the production efficiency of the kiln system and reducing the clinker firing rate. heat loss purpose. After the raw meal is preheated and pre-decomposed in the cyclone preheater, the next process is to enter the rotary kiln for clinker firing.

5. Firing of cement clinker

In the rotary kiln, the carbonate further rapidly decomposes and undergoes a series of solid phase reactions to generate other minerals in cement clinker. As the temperature of the material increases, the minerals will turn into a liquid phase, and the and dissolved in the liquid phase will react to generate a large amount of clinker (clinker). After the clinker is fired, the temperature begins to decrease. The cement clinker cooler cools the high-temperature clinker discharged from the rotary kiln to a temperature that can be tolerated by downstream transportation, storage and cement mills. At the same time, it recovers the sensible heat of high-temperature clinker and improves the thermal efficiency of the system and clinker quality.

6. Cement grinding

Cement grinding is the process of cement manufacturing and the process that consumes the most electricity. Its main function is to grind cement clinker (and gelling agent, performance adjustment materials, etc.) to a suitable particle size (expressed in terms of fineness, specific surface area, etc.) to form a certain particle gradation, increase its hydration area, and accelerate The hydration speed meets the cement slurry setting and hardening requirements.

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