Rotary kiln production method and equipment for bleaching powder product

Abstract

The invention relates to a rotary kiln production method and equipment for a bleaching powder product. The production method is characterized by comprising the following steps: pouring slaked lime into a rotary kiln with inclination during a chlorination process of slaked lime and chlorine, continuously winnowing and spreading slaked lime through a plurality of winnowing plates arranged in the rotary kiln and capable of rotating along with the rotary kiln so that the slaked lime and refluent chlorine are fully contacted and chlorinated, wherein the adopted rotary kiln is a cylinder with two closed ends and can axially rotate, a feed inlet is formed in one end of the rotary kiln, a discharge outlet and a chlorine inflation inlet are formed in the other end of the rotary kiln, the cylinder has a gradient as a whole, and a plurality of L-shaped winnowing plates which are axially arranged and have bends are evenly arranged on the inner wall of the cylinder. The defects and deficiencies of the traditional central screw chlorination technology can be fundamentally overcome, the technological process and the adopted equipment are simpler, the chlorination effect is better, the products have higher quality and are energy-saving and environment-friendly, and the rejection rate of products and the production, installation, and maintenance costs of equipment can be greatly lowered.

Description

technical field [0001] The invention relates to the production of bleaching powder, in particular to a production method of bleaching powder products, that is, a rotary kiln production method and the equipment used therein. Background technique [0002] At present, the production method of known bleaching powder product is: slaked lime (calcium hydroxide) is sent in the bleaching powder machine by conveyor, becomes bleaching powder finished product after contacting chlorination with chlorine countercurrent in the bleaching powder machine. The chlorination process of this method adopts central spiral stirring chlorination: the powder bleaching machine is composed of four or five mixing drums 1 fixedly arranged and connected in order from top to bottom, and the central shaft 2 of each mixing drum is equipped with multiple pieces Stirring screw blade 3 (as attached figure 1 As shown), the motor drives the central shaft and rotates the spiral blades to stir the slaked lime to c...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1. The slaked lime is piled up at the bottom of the mixing drum, and it needs to be stirred by the spiral blade to make it contact with the countercurrent chlorine gas. It cannot be evenly dispersed, so the contact with chlorine gas is not thorough. Even if it is repeatedly stirred by four-section or five-section mixing drums, there will still be a certain proportion of slaked lime that cannot fully contact with chlorine gas and be chlorinated, resulting in a decline in the quality of bleaching powder , the scrap rate is high, and the production cost increases; 2. The powder bleaching machine is composed of multi-section mixing drums arranged up and down, and the production, installation and maintenance costs of the equipment are high; Friction, and the stirring spiral blade is generally made of metal material with anti-corrosion surface, which is not resistant to corrosion and wear. When the corrosion or wear reaches a certain level, the forward (lower section) pushing and turning functions will gradually lose. One is to make the bleaching powder barrel If the body is blocked, the heat of reaction cannot be removed, causing the bleaching powder to decompose, and the effective chlorine content of the finished product is reduced. Or insufficiently reacted materials cannot be fully contacted with chlorine gas and chlorinated, so that the resulting bleaching powder product cannot meet the quality requirements; the third is that the screw blades are replaced frequently, which not only delays production, but also increases maintenance costs.

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