Reactor and process for preparing iron oxide by circulating precipitation method

Abstract

The invention relates to a reactor and a process for preparing iron oxide by utilizing a circulation type precipitation method. The reactor is composed of a reaction tank, an inner barrel, a frequency conversion motor, a main shaft, stirring paddles, a heating coil and a bottom aeration tray. One inner barrel is installed inside the reaction tank, the frequency conversion motor and the main shaft are installed at the top of the reaction tank, two sets of stirring paddles are installed on the main shaft, and the aeration tray and the heating coil are installed at the bottom of the reaction tank. The frequency conversion motor is controlled by a frequency converter to achieve different stirring speeds and control mixing uniformity of liquid inside the reaction tank. Air required by reaction is fed into the bottom aeration tray, the air rises to drive reaction liquid of the inner barrel to rise and overflow outside the inner barrel, and reaction liquid outside the inner barrel flows downward to form a loop. Reaction material inside the reaction tank is fully mixed, after the reaction is conducted for a period of time, and the reaction is stopped until color paste inside the reaction tank achieves a required state.

Description

technical field [0001] The invention relates to a reactor and a process for preparing iron in an inorganic pigment iron oxide production system, in particular to a reactor and a process for preparing iron oxide by a circulation precipitation method. Background technique [0002] Iron oxide pigment is an important inorganic chemical pigment widely used in coatings, construction and transportation. 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 process of producing iron oxide by the dry method, and the environmental pollution is serious; the wet method is a method commonly used in industry at present. In the production process of producing iron oxide by the wet method, 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 is added to adjust the pH value. At a certain t...

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Problems solved by technology

However, there are few reactor designs for preparing iron oxide in the published reports at present. For example, the invention patent "process and equipment for manufacturing iron oxide red by wet method" (CN1143049A) discloses a production process for iron oxide red, but the reaction equipment requires simpler

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