Reactor for preparing iron oxide red

Abstract

The present invention relates to a reactor for preparing iron oxide red. The reactor comprises a reaction tank, a variable-frequency motor, a main shaft, stirring paddles, a heating coil pipe, aeration disks and a conical air distribution plate, wherein the top portion of the reaction tank is provided with the variable-frequency motor and the main shaft, the main shaft is provided with two sets of the stirring paddles, the conical air distribution plate is arranged between the two sets of the stirring paddles and on the inner wall of the reaction tank, and the bottom portion of the reaction tank is provided with the heating coil pipe and the aeration disks. According to the present invention, the frequency converter is utilized to control the variable-frequency motor so as to achieve different stirring rates and control the mixing uniformity of the liquid in the reaction tank; and the air required by the reaction is introduced into the aeration disks on the bottom portion, and rises to the conical air distribution plate so as to be secondarily and uniformly dispersed.

Description

technical field [0001] The invention relates to a reactor for preparing iron oxide red in an inorganic pigment iron oxide red production system, in particular to a gas-liquid-solid three-phase reactor for preparing iron oxide red. Background technique [0002] Iron oxide is an important inorganic chemical pigment, and iron oxide red is a relatively common one, which is widely used in coatings, construction, transportation and other fields. At present, the production methods of iron oxide pigments include dry method and wet method. A large amount of waste gas is produced in the dry production process, the environmental pollution is serious, and it is not practical in a large amount; the wet method is a method commonly used in industry at present. In the production process of wet production of iron oxide, cylindrical reaction tanks are generally used for reaction . The reaction raw material ferrous sulfate solution is added to the reaction tank, and sodium hydroxide solution...

AI Technical Summary

Problems solved by technology

In this case, the distribution of the gas-liquid-solid flow field in the gas-liquid-solid three-phase reactor is extremely important. If the design is unreasonable, it will cause a dead angle in the reaction, resulting in a decrease in the effective reaction volume of the reactor, a decrease in reaction efficiency, and uneven distribution of product particles. The quality has declined, and there are few designs for preparing iron oxide red reactors in the current public reports. For example, the invention patent "Wet Process and Equipment for Manufacturing Iron Oxide Red" (CN1143049A) discloses a production process for iron oxide red, but Simpler requirements for reaction equipment

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