What are the complete sets of equipment for producing lime powder
In modern industrial production, lime powder is widely used as an important building material and chemical raw material in various fields such as construction, metallurgy, environmental protection, agriculture, etc. So, what complete sets of equipment are needed to produce high-quality lime powder? Next, we will provide a detailed introduction to the main equipment for producing lime powder, including lime kiln production lines, screening equipment, grinding equipment, packaging equipment, etc.
1、 Lime kiln production line
Lime kiln is the core equipment for producing lime powder, which is used to calcine and decompose limestone raw materials at high temperatures to produce quicklime (CaO). According to different calcination processes and fuel types, lime kilns can be divided into various types, such as rotary kilns, vertical kilns, and rotary kilns.
（1） Rotary kiln
A rotary kiln is a large-scale rotary calcination equipment, which works by adding limestone raw materials from the kiln tail and slowly moving towards the kiln head as the kiln body rotates. After preheating, calcination, and cooling stages inside the kiln, the finished quicklime is finally discharged at the kiln head. Rotary kilns have the advantages of high production capacity, high degree of automation, and stable product quality, making them suitable for large-scale lime production. For example, a lime rotary kiln production line with a daily output of 500 tons can meet the needs of large-scale construction projects and chemical enterprises.
（2） Vertical kiln
Vertical kiln is a type of vertical calcination equipment with a relatively simple structure and low investment cost. The limestone raw materials in the vertical kiln are distributed in layers from top to bottom, and the fuel is added from the top or side of the kiln for counter current or co current calcination with the limestone. The production capacity of vertical kilns is relatively small, but the energy consumption is low, making them suitable for small and medium-sized lime production enterprises.
（3） Sleeve kiln
Sleeve kiln is an advanced lime calcination equipment that adopts a double sleeve structure, which fully utilizes heat and improves energy efficiency. The calcination process of the rotary kiln is stable, the product quality is high, and the pollution to the environment is small, making it a relatively environmentally friendly type of lime kiln.
2、 Screening equipment
The screening equipment is used to screen the calcined quicklime, removing impurities and oversized particles to ensure uniform particle size of the product. Common screening equipment includes vibrating screens, drum screens, etc.
（1） Vibrating screen
A vibrating screen uses the excitation force generated by a vibrating motor to vibrate the screen surface, thereby screening materials on the screen surface. The vibrating screen has the advantages of high screening efficiency, large processing capacity, and simple structure. It can adjust the mesh size as needed to achieve screening of different particle sizes. For example, for the production of lime powder for construction, it is usually necessary to sieve the quicklime into products with different particle sizes such as 0-3mm, 3-6mm, 6-10mm, etc.
（2） Drum screen
Drum screen is a device that uses the rotation of a drum to roll materials inside the drum and sieve them through the sieve holes. Drum screen is suitable for screening materials with large processing capacity and particle size, and has the advantages of smooth operation, low noise, and easy maintenance. In the production of lime powder, drum screens are commonly used for preliminary screening of large quicklime blocks to remove impurities and oversized particles.
3、 Grinding equipment
The grinding equipment is used to further grind the screened quicklime into fine powder to meet the requirements of different industries for the fineness of lime powder. Common grinding equipment includes Raymond mill, vertical mill, ring roller mill, etc.
（1） Raymond Mill
Raymond mill is a traditional grinding equipment, which works by rotating the grinding roller inside the grinding ring to crush the material and grind it into fine powder. Raymond grinding tools have the advantages of compact structure, simple operation, and convenient maintenance, but their production capacity is relatively small and suitable for small and medium-sized lime powder production enterprises.
（2） Vertical mill
Vertical mill is a new type of grinding equipment that adopts the principle of material bed grinding. It forms a material bed on the grinding disc and grinds the material into fine powder through the rolling and grinding action of the grinding roller on the material bed. Vertical mills have the advantages of high production capacity, low energy consumption, and uniform product fineness, making them suitable for large-scale production of lime powder. For example, a lime powder vertical mill with a daily output of 100 tons can meet the needs of large building materials enterprises.
（3） Ring roller mill
Ring roller mill is a medium speed micro powder grinding equipment that crushes materials into fine powder through the squeezing and grinding action between the grinding ring and the grinding roller. Ring roller grinding tools have the advantages of high product fineness, low energy consumption, and small footprint, and are suitable for producing lime powder products with high fineness requirements.
4、 Packaging equipment
The packaging equipment is used to quantitatively package the ground lime powder for storage, transportation, and sale. Common packaging equipment includes valve pocket packaging machines, open pocket packaging machines, etc.
（1） Valve Pocket Packaging Machine
Valve pocket packaging machine is a device that uses valve pockets for packaging. Its working principle is to feed the material into the valve pocket through a screw feeder, then control the weight of the material through a weighing sensor, and finally seal it. The valve pocket packaging machine has the advantages of fast packaging speed, high measurement accuracy, and good sealing, and is suitable for packaging lime powder products with high fineness.
（2） Open Pocket Packaging Machine
Open pocket packaging machine is a device that uses open pockets for packaging. Its working principle is to feed materials into the open pockets through a belt conveyor, then control the weight of the materials through an electronic or mechanical scale, and finally seal them. The open pocket packaging machine is suitable for packaging lime powder products with large particle size and low packaging speed requirements.
The production of lime powder requires a complete set of equipment, including lime kiln production line, screening equipment, grinding equipment, and packaging equipment. When selecting equipment, comprehensive consideration should be given to factors such as production scale, product quality requirements, and investment budget to ensure the production of high-quality lime powder products that meet market demand.
