Ultrafine inorganic powder materials have a wide range of applications in the chemical, electronics, metallurgy, pharmaceutical, food, ceramics and other industries. However, there are extremely high requirements for the purity and fineness of materials. Therefore, the finishing of such new materials as a high-tech, high value-added industry has recently developed rapidly in China. But the main factor constraining its development is often the equipment industry. For example, the cracking catalysts required by some petrochemical industries have long been monopolized by foreign countries, and the import price is very high. The production process has been mastered by domestic scientific and technological institutions, and there are many problems in the production of key calcining equipment. The RG series rotary electric furnace developed by Shanghai Chenhua Electric Furnace Co., Ltd. has been widely used in the calcination preparation of various fine inorganic non-metallic materials. These include the preparation of electroceramics and chemical raw materials BaTio3, LiMnO2 and LiCoO2 in electronic communication materials, and catalysts for rare earth and petrochemical industries. Has the strength to replace imported products.
First, the furnace features
The calcination of high-quality ultra-fine inorganic powder materials requires high purity, and impurities such as flue gas should be avoided to pollute the powder. The relative yield is low (so the specific gravity is generally less than 1, or even less than 0.3), and the temperature is The atmosphere and pressure are highly demanding, so we use a non-polluting, low-noise electric heating method.
The traditional powder heating is heated by shuttle kiln, pusher kiln, etc., and the heating of such equipment generates uneven heating, which is prone to defects such as pinning and over-burning. Therefore, we use the rotary heating method of the metal cylinder, and the barrel is provided with scraping. The plate is fully stirred under the action of the rotation of the cylinder and the scraper, and the material is moved radially and axially in the cylinder to achieve full, uniform and stable heating.
The mechanical transmission is driven by the chain and the gear, and the rolling bearing supports and rotates at both ends of the cylinder.
The main technical parameters productivity 5 - 250Kg / hour heating mode electric heating (outer tube heating)
Rated power 15-200KW±10%
Zui high use temperature 1050 ° C
Temperature control accuracy ≤ ± 2 ° C
Work area furnace temperature uniformity ≤ ± 5 ° C
Control mode intelligent PID
Rotation speed 0-5 rev / min (frequency control)
Second, equipment operation
After the equipment is installed, after commissioning and drying, the test run can be carried out. Considering that the furnace body should have strong adaptability, first run under no-load conditions, evaluate the equipment, and measure the temperature of the furnace and the wall by using the thermocouple and the optical temperature meter in the furnace. After about 90 minutes of heating, the furnace can reach 1000 °C
In the insulation stage of 1000 °C, the uniformity of the furnace temperature in the measured working area is within ±5 °C, which meets the design requirements. At the same time, it was found that the heating and heat preservation of the furnace body basically satisfied the calcination requirements of the ultrafine powder material through the adjustment of the input power.
Third, the conclusion
The calcination of high-grade inorganic non-metallic materials ultra-fine powder can not be solved by electric heating plate kiln, and the rotary resistance furnace is energy-saving (energy-saving effect of 65%), quality of finished products, productivity, sealing and environmental protection. There are incomparable advantages and the prospect of promotion and application. In the special ceramic raw materials, electric porcelain, chemical raw materials and electronic materials, even pharmaceuticals, food additives and other high-demand powder deep processing products, select dynamic heating technology and fine equipment to achieve precise atmosphere control, is to achieve high-grade powder A viable path for product production.
First, the furnace features
The calcination of high-quality ultra-fine inorganic powder materials requires high purity, and impurities such as flue gas should be avoided to pollute the powder. The relative yield is low (so the specific gravity is generally less than 1, or even less than 0.3), and the temperature is The atmosphere and pressure are highly demanding, so we use a non-polluting, low-noise electric heating method.
The traditional powder heating is heated by shuttle kiln, pusher kiln, etc., and the heating of such equipment generates uneven heating, which is prone to defects such as pinning and over-burning. Therefore, we use the rotary heating method of the metal cylinder, and the barrel is provided with scraping. The plate is fully stirred under the action of the rotation of the cylinder and the scraper, and the material is moved radially and axially in the cylinder to achieve full, uniform and stable heating.
The mechanical transmission is driven by the chain and the gear, and the rolling bearing supports and rotates at both ends of the cylinder.
The main technical parameters productivity 5 - 250Kg / hour heating mode electric heating (outer tube heating)
Rated power 15-200KW±10%
Zui high use temperature 1050 ° C
Temperature control accuracy ≤ ± 2 ° C
Work area furnace temperature uniformity ≤ ± 5 ° C
Control mode intelligent PID
Rotation speed 0-5 rev / min (frequency control)
Second, equipment operation
After the equipment is installed, after commissioning and drying, the test run can be carried out. Considering that the furnace body should have strong adaptability, first run under no-load conditions, evaluate the equipment, and measure the temperature of the furnace and the wall by using the thermocouple and the optical temperature meter in the furnace. After about 90 minutes of heating, the furnace can reach 1000 °C
In the insulation stage of 1000 °C, the uniformity of the furnace temperature in the measured working area is within ±5 °C, which meets the design requirements. At the same time, it was found that the heating and heat preservation of the furnace body basically satisfied the calcination requirements of the ultrafine powder material through the adjustment of the input power.
Third, the conclusion
The calcination of high-grade inorganic non-metallic materials ultra-fine powder can not be solved by electric heating plate kiln, and the rotary resistance furnace is energy-saving (energy-saving effect of 65%), quality of finished products, productivity, sealing and environmental protection. There are incomparable advantages and the prospect of promotion and application. In the special ceramic raw materials, electric porcelain, chemical raw materials and electronic materials, even pharmaceuticals, food additives and other high-demand powder deep processing products, select dynamic heating technology and fine equipment to achieve precise atmosphere control, is to achieve high-grade powder A viable path for product production.
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