Rotary crystallization kiln for alpha gypsum powder

Abstract

The invention discloses a rotary crystallization kiln for alpha gypsum powder. The rotary crystallization kiln for alpha gypsum powder comprises a rack, a kiln body, a feeding end, a discharging end, a tail gas collector, a heat supply chamber, a heat exchanging pipe, an inlet end socket, an outlet end socket and a power transmission device, wherein the kiln body and the power transmission device are mounted on the rack; the power transmission device is used for driving the kiln body to rotate on the rack, and when the inlet end socket and the outlet end socket are closed, the kiln becomes an airtight space; and a circle of heat exchanging pipe communicated with the heat supply chamber and having the function of a lifting board is fixed on the inner wall of the kiln body. The rotary crystallization kiln is in a dynamic mode rather than a static mode; the heat exchanging area is increased due to the arrangement of the heat exchanging pipe; heat energy is fully used through multiple technical methods, and therefore, energy consumption is lowered; the functions of pre-drying, autoclaving crystallization and product drying are integrated, the process steps are reduced, the quantity of equipment is lowered, the production time is shortened, and the production cost is lowered; and no external high-temperature steam or aqueous solution participates in heat exchange and reaction, and hemihydrate gypsum is prevented from being hydrated again into dihydrate gypsum, so that the product quality is more stable.

Description

technical field [0001] The invention relates to a gypsum processing equipment, in particular to an α-type high-strength gypsum powder rotary crystallization kiln. Background technique [0002] α-type high-strength gypsum is also called α-type hemihydrate gypsum, or α-gypsum for short. Because of its high strength, high density, high hardness, high fluidity and many other advantages, it is widely used in molds, precision casting, high-grade building decoration materials and other fields. At present, there are two main types of equipment commonly used for the production of α-gypsum: horizontal, vertical Type autoclave reactor and liquid phase reactor, both types of equipment are fixed equipment. [0003] The horizontal and vertical autoclave reaction kettles mainly use massive natural gypsum as raw materials. After putting the raw materials into the kettle, they are filled with saturated water vapor and autoclaved for 7-12 hours, and then dried for 10-24 hours to prepare α p...

AI Technical Summary

Problems solved by technology

This process requires large investment in equipment, complex process, lengthy process, unstable product quality, and the highest energy consumption and unit cost of the product among all process methods.

[0007] The liquid phase method is still in the experimental stage due to its complicated process and equipment, as well as strict operating requirements.

Even if it is occasionally used in industrial production, it will eventually be eliminated by the market due to poor product quality stability and high cost.

Therefore, the liquid phase method cannot really realize competitive industrial application at this stage.

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