A method for removing rings in a kiln

Abstract

The invention relates to a method for removing formation rings in a kiln. The method comprises the step of blowing air into the kiln, wherein the oxygen content of the air is 60%-70%. The method has the advantages that cost can be lowered, melting can be quickly performed on the kiln, the time for performing melting on the kiln is 5 hours or so, and therefore time is greatly saved.

Description

technical field [0001] The invention relates to a method for removing rings in a kiln. Background technique [0002] Ring formation refers to the formation of an annular and hard ring in a specific area of ​​the kiln due to excessive bonding of materials during normal production in the kiln, which hinders the movement of materials. Ring formation in the kiln is a problem that often occurs in the smelting industry at present. It will destroy the normal heating process in the kiln, affect the ventilation in the kiln, and directly affect the product, quality and long-term safe operation of the kiln. For example, usually low melting point in the production process of volatilization kiln: SiO 2 ≥13%, Al 2 o 3 ≥3.5%, S≥7%, Pb≥7%, the liquid phase in the volatilized materials increases at 850-1100°C, and the low melting point substances will stick to the inner wall of the kiln layer by layer. The diameter is getting smaller and smaller to form a ring (ridge), so that the materi...

AI Technical Summary

Problems solved by technology

This method has the disadvantage that the kiln shutdown time is too long, which affects the production output.

[0006] Most manufacturers now adopt the first method, which can continue production without stopping the kiln; the second method is used when the first method cannot be used, such as the following situations: (1) The ring-forming part enters from the kiln head After 28m, the chemical kiln has no effect for a few days

(2) The ring formation in the kiln is quite serious, the inner diameter is too small, the smoke can hardly pass through, and the kiln cannot be melted

[0007] The internal diameter of the kiln ring in the applicant's processing plant is only 800cm, which seriously affects the inability of raw materials to pass through. A large amount of raw materials blocked at the end of the kiln fall over the retaining ring and fall into the first dust hopper, resulting in a large amount of raw material, and the product quality drops by 8-15. %

Therefore, the kiln must be chemicalized, and the ring-forming part is 20-25m away from the kiln head. It takes more than 72 hours to reduce the inner diameter of the ring-forming part to 1.8-2.1m. The coal ratio of the chemical kiln is 2 tons of coal: 1 ton of ore, and the processing capacity is 90 Ton / h, 60 tons of coal and 30 tons of ore consume 48 tons more per hour than normal production × 3 shifts = 144 tons. In order to use 5 kg of wind pressure, in addition to the Roots blower, it is necessary to open a 40m 3 Air compressor, motor power 100KW×72h, total cost 315,744 yuan, and other costs related to this have not been estimated