Ferrous sulfate heptahydrate dryer

Abstract

The invention discloses a ferrous sulfate heptahydrate dryer, relates to drying equipment, and provides a dryer suitable for drying ferrous sulfate heptahydrate. The dryer comprises a feeding mechanism, a fixed drying cylinder, a rotating drying cylinder, a discharge mechanism, a center shaft, a rotating drying cylinder support driving mechanism and a center shaft support driving structure, wherein the feeding mechanism, the fixed drying cylinder, the rotating drying cylinder and the discharge mechanism are arranged in sequence, and are communicated through internal spaces; a hot air inlet is formed in the fixed drying cylinder; push blades and dispersing blades connected with the center shaft are arranged in the fixed drying cylinder; the push blades are plane blades arranged slantwise corresponding to the axis of the center shaft; and two push blades and two dispersing blades are arranged on one axial position of the center shaft in a such manner of being centrosymmetric about the axis of the center shaft . The ferrous sulfate heptahydrate dryer is suitable for a drying process for drying a mixture of dried materials and free water-contained ferrous sulfate heptahydrate.

Description

technical field [0001] The invention relates to a drying device, in particular to a ferrous sulfate heptahydrate dryer. Background technique [0002] Ferrous sulfate heptahydrate has a relative density of 1.898 and a melting point of 64°C. It changes from a heptahydrate compound to a tetrahydrate at 56.6°C, becomes a monohydrate at 64.6°C, loses six crystal waters at 90°C, and loses six crystal waters at 300°C. Lose all the water of crystallization and become anhydrous. When using conventional technology and equipment to dry ferrous sulfate heptahydrate slag from sulfuric acid process titanium dioxide, which usually contains 10-20% free water, during the heating process, ferrous sulfate heptahydrate will precipitate water and dissolve to form a slurry The material will stick to each other, so it is easy to stick to the inner wall of the drying equipment, which will reduce the production capacity and output of the drying production line, and even cause shutdown in severe cas...

AI Technical Summary

Problems solved by technology

2. The output is low. When the input is increased, the material above the flash drying body will accumulate. When the accumulation reaches a certain level, it will suddenly fall down, thereby blocking the entire refiner shaft, so that the refiner stops running, and the maintenance is very difficult. inconvenient

[0005] Air drying: 1 feeding problem, using screw feeder, there will be blockage

2 Ascension problem, in order to make some coarse-grained materials enter the airflow pipeline, a lifter is needed. Due to the characteristics of ferrous sulfate heptahydrate, the lifter will also be blocked

3 The output is low, when the output increases, the same symptoms as flash drying will appear

3 The output is low, when the output is increased, the above phenomenon will be more serious

[0007] Drum drying: 4. Sticking to the wall of the cylinder, it will stick to the wall of the cylinder. In severe cases, a large cylinder will stick to a small cylinder; all the lifting plates in the cylinder will lose their function, so that the drying performance will drop sharply

5 Agglomeration, because the material will precipitate moisture when heated, so that the materials will stick to each other, and form agglomerates under the action of the drum, resulting in difficulty in drying

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