A kind of drying and calcining processing technology and equipment for crystallized aluminum chloride hexahydrate

Abstract

Provided are a technology and device for dry calcination processing of aluminum chloride hexahydrate. The problems of high energy consumption, serious pollution, incapability of continuous production,incapability of full recycling of a heat source of exhaust gas and a product with an unsatisfied activity value and purity for requirements for the product quality in the prior art are solved. The dry calcination processing technology is characterized by adopting the five steps of: vibration feeding, rapid drying, gas-solid separation, three-level calcination and cooling recovery, and the deviceincludes a disk feeder, a rapid dryer and a three-level calcining furnace. The technology and device for dry calcination processing of the aluminum chloride hexahydrate have the advantages that deviceinvestment is saved, recycling of the heat source of the exhaust gas is achieved, and the problems of the occurrence of material blocking, material swelling and material sticking are solved completely; in addition, full decomposition of a material during the processes of crushing and scattering and full mixing of hot air in space can be kept, the conveying capacity is improved, the delivery loadis reduced, the time of material drying is short, and therefore energy consumption is reduced; furthermore, continuous production in a fully closed state can be achieved, environmental protection is achieved, the purity and activity of the product can reach a highest level, and remote control can be achieved.

Description

Technical field [0001] The invention belongs to the technical field of inorganic salt chemical processing, especially to the technical field of drying and calcination, especially for crystallized AlCl. 3 .6H 2 The separation of crystal water during the drying process of O (aluminum chloride hexahydrate) and the calcination process to form metallurgical Al 2 O 3 The product is a drying and calcining processing technology and equipment for crystalline aluminum chloride hexahydrate. Background technique [0002] Drying calcination is a chemical process suitable for the modification, decomposition, purification, oxidation, and reduction of inorganic salts. It also produces high-temperature gas. The commonly used calcination equipment now includes rotary kilns, push plate kilns, fixed kilns, ebullated beds, etc. State of the art processing of crystallized AlCl 3 .6H 2 There are two ways of O, one is rotary kiln calcining and the other is spray calcining. The rotary kiln is ...

AI Technical Summary

Problems solved by technology

This invention solves the problem of continuous production and reduces energy consumption, but there are still some technical problems, especially the need for two sets of automatic burners, wherein the first automatic burner provides a heat source for the spin flash dryer, and the second The automatic burner provides the heat source for the calciner. During the processing, a lot of energy is wasted invisible. Moreover, the calcined products of this invention are directly recycled into the cloth bag. There is no preheating device and cooling recovery device, and the tail gas heat source cannot be fully recycled. In addition , the calciner used in this invention is a two-stage calciner. After years of research and development experiments and phased production and use, it has been proved that there are many disadvantages in the two-stage calciner. Because the material operates in a fluidized state in the calciner, it instantly flows with the airflow. The calcination time of the two-stage calcination furnace is short, resulting in insufficient calcination. When a similar situation occurs, measures such as increasing the temperature and reducing the wind speed and flow of the induced draft fan need to be taken. However, when taking these measures, The product will be over-burned or sintered, the reduction rate will increase, and the activity value and purity of the product cannot meet the product quality requirements

In addition, the invention adopts a rotary flash dryer, and the inner bottom of the dryer adopts a convex platform base, and its top and both sides are designed as broken scraper blades of the same structure, and the scraper blades are in a W shape. The convex platform moves in a circular motion. Due to the limited breaking space and structure, the resistance and load are too large, the power consumption is too large, and it is easy to cause material blockage, resulting in parking and continuous production.

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