[Technology] Application of agitating sand mill in the preparation of electric porcelain raw materials

In the manufacturing process of powder materials, one of the most important performance indicators is the particle size of the particles. The size of the particles largely determines the technical performance of the product, and at the same time, it has a great influence on the application range of the product. Among the powder products, specific surface area, sintering property and dispersibility are also important, and these properties are closely related to the particle size and particle size distribution. With the speed of research on powder engineering technology, some new types of grinding equipment and processes have emerged. These new processes can greatly improve the grinding efficiency and quality of the products.

First, the progress of fine grinding technology

(1) Several common fine grinding techniques

The first is the drum ball mill, which is the raw material grinding equipment used by most domestic enterprises, and its application is very extensive. The ball mill is characterized by simple operation and good running performance. After the equipment fails, it can be quickly repaired, but the pulverized particles are large. Generally, ball mills are usually wet-ground, and of course, dry grinding techniques can also be used. However, in the conventional ball mill, the production efficiency is low, and when the particles having a particle diameter of 10 μm or less are ground, the production efficiency is greatly reduced, and the efficiency of the enterprise is greatly reduced, and the production cost is greatly improved. In addition, there are problems such as large equipment damage and large production noise.

The other is agitating mill, which was invented by American scientists. The principle is similar to that of a blender in a chemical experiment. The main component is a fixed cylinder and a rotary agitator, and the cylinder is filled with grinding media. Outside the cylinder of the agitating mill, a jacket is generally installed, and cold water can be introduced into the jacket to reduce the high temperature generated during grinding. For the inner wall of the grinding cylinder, a suitable material can be added according to the needs of the product. In addition, a fixed short rod can be added to increase the grinding effect.

(II) Current status of crushing process of electric porcelain raw materials

For the electric porcelain raw material, the pulverization process is similar to that of other ceramic raw materials, and is mainly finely ground by a conventional ball mill. However, with the continuous improvement of China's high-voltage transmission technology, higher strength requirements are imposed on electric porcelain materials. Therefore, the traditional grinding manufacturing process can no longer meet the production needs.

In order to better enhance the mechanical strength of the electroceramic material, it is possible to add some high-strength material particles, such as corundum , to the conventional production process. In addition, in order to reduce production costs, it can change the production process of aluminum oxide. However, the corundum granules have higher strength and higher hardness, so the conventional grinding technology has higher production cost and is inefficient.

Second, the application of agitating sander in the preparation of electric porcelain raw materials

Through the study of the main hard materials in the production of electric porcelain materials, it can be found that the traditional grinding method has low production efficiency. Therefore, the agitating sanding process has been invented, which can greatly improve the production efficiency and reduce the product in the product. The coarse particle content reduces the distribution range of the particle size.

(1) Application in the preparation of ordinary insulator blanks

Ordinary insulator billet production materials include Guangdong Baimu, Changfeng Mud and Ma Mu, etc. The production equipment is a 10t ball mill. In each billet production, the raw material is filled to 8.5t, and then the ball and water are added according to a certain ratio. After ball milling for 14 hours, the ground material was finally slurried.

For ordinary insulator blanks, the raw materials for production are generally raw ore particles. The raw materials of these raw materials are large, especially some clay- based raw materials, and their shapes are generally large blocks, which cannot be directly ground using a sand mill. By sampling the products produced in the conventional ball mill and then grinding them with a stirring sand mill, and finally comparing the performance of the two, it can be found that most of the products in the ball mill are below 10 micron particle size at 6h. However, there are still larger particles larger than 30 microns, and even the largest products can be above 50 microns.

For the sand mill, the raw material requirements are quite different, and the diameter of the raw material cannot be too large. In order to prevent the production equipment from malfunctioning, the raw material of the sand mill is the billet after 8 hours of ball milling, added to the agitating sand mill, ground for 20 min, and sampled every 5 min to measure the particle size of the particles. And the distribution of the particles.

Through the comparison of experimental data, we found that the combined use of ball milling and sanding technology can greatly reduce the particle size distribution range of the product, reduce production costs and improve production efficiency.

(II) Application in the preparation of high strength suspension insulator blanks

The raw materials for the production of high-strength suspension insulators are: bauxite and left cloud. Then, the agitating sanding is carried out according to the two feeding modes of one-time feeding and two feeding.

The one-time feeding is to batch the raw materials in the production formula, and then add them to the ball mill for sanding, and after the raw materials reach the required fineness, the subsequent production process is carried out. The two feedings are first grinding the hard material such as bauxite in the production formula, and then adding the remaining soft clay to the ball mill for grinding, and performing the subsequent production process after the grinding is completed. After the two grinding methods are completed, the billet is manufactured into a porcelain sample by a subsequent production process, and the properties of the product are measured. By comparing the performance of the products, the combined production process of ball milling and sanding can greatly enhance the bending resistance of the product. In addition, this new production process can improve the process performance of high-strength suspension insulator blanks.

Third, summary

Through the research on the agitating sander, we found that it can not only greatly shorten the production time, but also improve the grinding efficiency, reduce the number of large particles in the product, enhance the uniformity and density of the electroceramic material, and improve the electric porcelain products. Dry strength and so on. However, current agitator sanders are still in the development stage and there are many problems that require further research to optimize certain structures and functions in the equipment. The agitating sand mill will surely achieve great success in the future and bring huge benefits to the enterprise.