Lime Ceramic rotary kiln：
The characteristic of our appropriative kiln for ceramic are as belows: Automatic temperature control, Over-temperature alarm, Secondary air heat recovery, long life kiln lining, advanced sealing technology and device in the head and back of kiln, smooth operation, high intensity material, heat insulation, good Water seepage performance, low weight, high output and other striking characteristics. Our rotary kiln is widely used in the Calcinations and production of yellow soil, silt, coal ash, shale, furnace slag and all kinds of ceramic materials .
Introduction to Leca：
Clay ceramic granules, as the name suggests, are human shaped particles produced in ceramic materials. The main raw materials are clay, sub clay, etc., which are crushed, stirred, rolled, granulated, and fired. Widely used in building structural concrete, thermal insulation, water pollution treatment, landscaping, soilless cultivation and other related fields. The main processes are: raw material preparation, preheating, roasting, and cooling. Thermal conductivity: 0.08-0.15w/(m.k), bulk density: 300-500kg/m ³. The inlet temperature of the flue gas is 800 ℃, the outlet temperature is 200 ℃, the drying time is 20-40min, the roasting time is 15-20 minutes, the maximum temperature is 1150-1300 ℃, the material residence time is 15-20 minutes, and the ceramic particle discharge temperature is 1000 ℃.
The first thing that must be solved in the production of ceramic particles is the processing of raw materials and granulation processes. Its task is to crush, screen, mix, and prepare the collected raw materials into water containing materials with chemical composition that meets the requirements and uniform quality, and then use methods such as rolling and balling to produce raw materials of different particle sizes. There are many preparation processes for raw materials, which can be divided into dry method, plasticization method, grinding into balls method, and slurry into balls method according to the different types of raw materials.
The kiln type is suitable for using a double tube rotary kiln, where the preheating and drying sections of the kiln body can be independently controlled for their rotational speed, in order to control the heating time according to the condition of the raw materials. The factors controlled during the preheating stage are preheating temperature and preheating time, both of which have an impact on the final quality of the ceramic particles. If the preheating temperature is too high or the preheating time is too long, it will cause the raw material to produce a large amount of gas during the preheating stage, resulting in poor expansion of the ceramic particles due to insufficient expansion gas during the roasting stage; However, insufficient preheating can cause the raw materials to explode during the high-temperature roasting process, all of which will affect the final performance of the ceramic particles.
The roasting stage is the most critical step in the entire ceramic pellet roasting process, which directly affects the various properties of the ceramic pellet products. If not controlled properly, it can cause excessive gas pressure to overflow the shell and form open pores, resulting in low strength and high water absorption of the fired ceramic pellets. If the roasting temperature does not reach the optimal roasting temperature, the expansion ratio of the ceramic pellet products will decrease and the apparent density will increase. Usually, expansion occurs at temperatures above 1000 ℃.
The cooling process also has a significant impact on the quality of ceramic particles. It is generally believed that a reasonable cooling system for ceramic particles is as follows: the calcined ceramic particles can be quickly cooled to 1000 ℃ -700 ℃ after passing through the highest temperature expansion zone, but they need to be slowly cooled from 700 ℃ to 400 ℃ because the rapid temperature drop causes strong temperature shrinkage inside and on the surface of the ceramic particles, resulting in fine cracks on their surface and reducing their particle size strength. However, they can be quickly cooled below 400 ℃.
Introduction to shale ceramsite：
Shale ceramsite owns light weight, high strength, good thermal stability,frost resistance, sound absorption etc.,characteristics.Lightweight aggregate concrete has the advantages of light weight, high strength, earthquake resistance, carbonation, acid, wear resistance, heat insulation, volume stability, easy construction, and with the strength grade of ordinary concrete, can reduce the weight of 20% - 25%, greatly alleviating the structural dead load, improve the safety of the structure,which are ideal structural materials of high-rise buildings, large span building engineering.The appearance and color of shale ceramisite are different from different raw materials and process.The color of the ceramisite calcination mostly dark red, reddish brown, also have some special varieties for grey, black, gray and white, blue, grey, etc..
Shale ceramsite production process is as follows: Mining - First broken - Secondary crushing - Screening - feeding - sintering - cooling - screening.
Expanded Shale Lightweight Aggregates:
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