Guilin Hongcheng annual output of 200,000 tons of building ceramics vertical mill powder dry technology innovation

Ceramic is a hard substance formed by a proper ratio of clay raw material, barren raw material and flux material, through breaking, crushing, grinding (wet, dry), dehydrating Slime (wet method 1) or spray granulation (wet method 2) or semi dry granulation (dry method) forming and drying, after a series of physical and chemical changes have taken place by high temperature roasting. This paper mainly introduces the innovative process of dry powder making system for building ceramic vertical mill.

The commonly used materials in the ceramic field are quartz, feldspar (potash feldspar, sodium feldspar) and clay. At present, more than 90% of the domestic ceramic enterprises are still using the traditional wet ball milling technology. The dry method powder making has not been fully opened in China. It is in the initial stage and is a new technology of energy saving and consumption reduction for compared with the wet process. It can effectively alleviate the bottleneck of high emission, high energy consumption and high electricity consumption. It is a new technology which meets the national energy saving and emission reduction policy and realizes the green low carbon environmental protection production which has bright future.

The three most important non-metallic minerals in ceramic production are clay, quartz (rock, sand, powdery) and potash feldspar. The ceramic industry calls these three main raw materials as "the main body of traditional ceramics". The advantages of ceramics vertical mill dry method for powder making are water saving, saving electricity and reducing heat consumption. The process flow is: raw material crushing, proportioning, homogenization, vertical mill pulverizing, granulating machine granulation (adding water 10-12%), drying (water about 6%), screening, aging, forming, drying (moisture < 1%) and kiln calcination (1150 -1180 C, about 50 minutes) - forced to cool down by blower, edge grinding, polishing (according to product requirements).

Guilin Hongcheng tailored a ceramic powder production line in Guizhou is equipped with a dry milling process and granulation machine, which has reached an annual production capacity of 200,000 tons. The total investment cost is 22.6% less than the wet ball milling process, and the cost of energy consumption and water consumption is greatly reduced. The following is a brief introduction to the technical innovation of dry milling system.

1. Energy saving and environment-friendly Vertical mil and dry method of powder making system: using vertical mill, dry granulator and so on instead of traditional wet ball mill and spray drying tower system, save a lot of energy and water resources consumed by mud dehydration, finish grinding, granulation and drying at once, the cost of fuel is greatly reduced, only a small amount of electricity and water are needed which makes the technology high efficiency, energy saving, environmental protection.

2. Intelligent mixing control system: fine and precise individual control of mixing system ensures the accuracy and efficiency of raw material proportioning.

3. Intelligent automation granulation system: fine particle fluidity, high density of accumulation, granulation and particle optimization according to the requirements of customer particle gradation, high degrees of automation and excellent quality of finished products.

4. Energy saving and environmental protection drying system: the material stay time is adjustable, the heat transfer intensity is high, the heat efficiency is high, the moisture of the finished product is low, the material drying is uniform, the heat of the local raw materials can be avoided, the waste heat of the kiln can be used to reduce the fuel cost; the system adopts multistage dust removal to improve the product capacity, reduce material loss and adopt all closed structure enables environment to be clean and environmental protection.

5. The process is simplified and the cost of investment is low: the traditional wet milling machine grinding process is dry-wet-dry. The production line of the powder granulating line is basically dry. The vertical grinding powder mechanism powder is used to replace the wet ball mill process. The spray drying tower and ball mill are omitted; the investment cost and the infrastructure cost of the equipment are reduced.

6. The quality of the finished product is high: the dry powder granulation process made product has high strength and high mechanical strength, which is beneficial to the first firing and rapid firing of ceramic tiles, and further increase the energy saving of the production process.

At present, the building ceramic vertical mill dry powder production line has stable operation, reliable performance and high production efficiency. The construction of the whole project has been highly recognized by customers.