Method for rapidly preparing black iron oxide from ferrous sulfate as titanium dioxide waste residue

Abstract

The invention discloses a method for rapidly preparing black iron oxide from ferrous sulfate as a titanium dioxide waste residue and belongs to the technical field of chemical engineering. The method comprises the following steps: a, removing impurities from ferrous sulfate to obtain a ferrous sulfate solution; b, taking a part of ferrous sulfate solution, diluting until the concentration is 10-15%, then introducing air or oxygen, controlling the pH value of the solution at 3-6, controlling the reaction temperature at 20-30 DEG C, and reacting until the color of the solution becomes earthy yellow, so as to obtain a crystal seed liquid; simultaneously and continuously adding the residue ferrous sulfate solution and ammonia to the crystal seed liquid, stirring and heating, controlling the pH value of the solution at 3.0-9.5, controlling the temperature at 70-90 DEG C, while continuously introducing air or oxygen, reacting for 5 to 6 hours, and filtering to a black iron precipitate; c, washing the iron black precipitate, filtering and drying to obtain the black iron oxide product. Since the process for preparing the black iron oxide disclosed by the invention requires only 5-6 hours and has the advantages of short time and low cost, and the method has relatively high economical and social benefits.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for rapidly preparing iron oxide black by using ferrous sulfate from titanium dioxide waste residue. Background technique [0002] Iron oxide black, the scientific name is ferric oxide (ferric oxide), is the combination of ferrous oxide (FeO) and ferric oxide (FeO). 2 o 3 ) adduct, which is one of the iron-based oxides, is named for its black color. It is easy to be oxidized when heated at high temperature, and turns into red ferric oxide. Insoluble in water and alcohol, soluble in concentrated acid and hot strong acid. It has magnetic properties, weather resistance, and light resistance. It is widely used in the coloring of inks, paints, papermaking, architectural coatings, and building materials. It is also used in the fields of flaw detection materials, catalysts, lithium batteries, and alkaline dry batteries. It is a common inorganic pigment....

AI Technical Summary

Problems solved by technology

The liquid-phase method iron black has a saturated and pure color, high tinting strength, and a good market, but the consumption of liquid alkali and steam is large and the cost is high

[0009] Patent application number 201110008756.7 discloses a high-purity iron oxide black pigment and its production method, but the method takes a long time to oxidize, and the yield and purity of iron oxide black are not high enough