Ferrous sulfate heptahydrate drying system

Abstract

The invention discloses a ferrous sulphate heptahydrate drying system, relates to drying equipment, and provides a ferrous sulphate heptahydrate drying system capable of avoiding a wall-adhering phenomenon. The ferrous sulphate heptahydrate drying system comprises a ferrous sulphate heptahydrate conveying device, a first dry material conveying device, a material mixing machine and a first drying device, wherein the ferrous sulphate heptahydrate conveying device and the first dry material conveying device are used for conveying materials to the material mixing machine respectively, and the materials discharged from the material mixing machine enter the first drying device. According to the ferrous sulphate heptahydrate drying system, ferrous sulphate heptahydrate and the dried materials are conveyed into the material mixing machine and mixed at first, and then conveyed into the first drying device and dried; the mixed materials cannot be adhered to the front sections of a charge system and a drying system of the first drying device; the materials are dried after entering the first drying device, and can be changed into particles with surfaces which are white ferrous sulphate monohydrate and with cores which are basically ferrous heptahydrate, and because a layer of ferrous sulphate monohydrate exists on the surfaces respectively, the wall-adhering phenomenon is avoided during the later drying process.

Description

technical field [0001] The invention relates to a drying device, in particular to a drying system for ferrous sulfate heptahydrate. 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 (usually also containing 10-20% free water) of sulfuric acid process titanium dioxide waste residue, in the process of heating up, ferrous sulfate heptahydrate will precipitate water and dissolve, The slurry is formed to make the materials stick to each other, so that 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, ...

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, and when the accumulation reaches a certain point, it will suddenly fall, thereby blocking the entire refiner shaft, so that the refiner stops running, and Maintenance is very inconvenient

[0005] Airflow drying: (1) Feeding problem, if the screw feeder is used, there will be blockage

(2) Lifting problem. In order to make some coarse-grained materials enter the air flow pipe, 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

(4) The pipe is blocked, especially at the elbow, and the general drying time is about seven days, and it needs to be cleaned once.

(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, and in severe cases, a large cylinder will be stuck into 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 materials 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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