A kind of drying equipment and drying method of polyaluminum chloride series salts

Abstract

The invention discloses a drying device for polyaluminum chloride series salts. The drying device comprises a heat-conducting oil tank, a drying mixer, a cooling device and an acid mist washing tower,wherein the drying mixer is arranged on the right side of the heat-conduction oil tank, and an acid mist discharge pipeline is arranged above the drying mixer. According to the drying device, polyaluminum chloride is dried through jointly heating of paddles and a box body in a rotating state, the thermal efficiency is high, the energy consumption is low and the drying time is short, materials aretransported along with the rotation of paddle shafts into a spiral track to the direction of a discharge port, stirring is continued during the moving process, so that the materials are continuouslyevaporated, and finally dried and uniform products are discharged from the discharge port. The residence time of the materials in the drying device is short, the drying device is suitable for materials with strict requirements on temperature, compared with roller drying and spray drying technologies, the floor area and space of the drying device are greatly saved, the investment is greatly reduced, the fully automatic production process from drying to packaging can be completely realized, and the production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a drying equipment and a drying method for polyaluminum chloride series salts. Background technique [0002] With the development of society, human beings began to pay more and more attention to the water environment on which they depend for survival. The shortage of water resources is a common problem in the world today. In some countries and regions, it has become an important factor restricting social development. At the same time, due to The deterioration of water quality caused by the discharge of pollutants has seriously damaged the ecological environment and even threatened human health. Water quantity and water quality are two aspects with a dialectical relationship. Water quantity is certainly the basic aspect to meet demand, but the deterioration of water quality In fact, the amount of available water is reduced. Under the condition of water shorta...

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Problems solved by technology

[0007] Due to raw materials and technical reasons, the quality of the products produced is not high, which not only wastes resources, but also affects the coagulation process. Therefore, a new process is developed to produce high-efficiency inorganic polymer flocculants - polyaluminium chloride, so that It is of great significance to improve the quality, thereby enhancing the coagulation capacity. Although the existing production equipment of polyaluminum chloride is improving day by day, there are still some deficiencies to be improved.

[0008] The drying equipment of the polyaluminum chloride series salts of the prior art has the following problems: 1. The existing production process of the polyaluminum chloride series salts is mostly divided into two types, which are drum drying process and spray drying process respectively. The drying process has the advantages of low failure rate and wide application range. The spray drying process has the advantages of large surface area of ​​the droplet group and short drying time. Shortcomings such as too long residence time are not suitable for materials with strict temperature requirements; 2. At present, steam dryers are generally used for drying polyaluminum chloride series salts, which not only produce solid aluminum chloride during the production of solid aluminum chloride. A large amount of steam, steam equipment requires a large investment, high production costs, and a great waste of energy. Moreover, coal combustion will pollute the surrounding environment, and the dust generated by combustion will also threaten the health of operators; 3. Most of the current polychlorinated Aluminum series drying equipment uses a stirring shaft to drive the material to rotate to achieve full mixing of the material. However, due to the high viscosity of polyaluminium chloride, the phenomenon of "shaft holding" often occurs, which not only hinders the normal production process, but also artificially clears the shaft. require a lot of labor costs

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