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Preparation method of iron oxide brown

An iron oxide brown and oxygen technology, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of unstable product quality and uneven hue, and achieve the effects of convenient operation, pure shade and stable quality.

Inactive Publication Date: 2012-06-20
ANHUI MINGZHU PIGMENT TECH
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Problems solved by technology

[0003] The traditional iron oxide brown is made by physical blending of iron black, iron yellow and iron red. The quality of the product is unstable and there is a lack of uneven hue. Therefore, the direct synthesis of iron brown products is superior to physical mixing in performance. The product

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Embodiment Construction

[0020] A kind of preparation method of iron oxide brown, it is characterized in that: comprise the following steps:

[0021] (1), in the reaction kettle, the ferrous sulfate solution with the concentration of 38-42% and the liquid caustic soda with the concentration of 40-45% are mixed into a slurry in a mass ratio of 1: 0.25-0.3, and water is added to make the slurry The concentration is adjusted to 10-12%, and the temperature is raised to 80-85°C;

[0022] (2), slowly add sodium nitrite according to the ratio of 36KG per ton of product input, and feed oxygen at the same time, and then open the spray equipment to fully mix the slurry, oxygen and the NO produced in the reaction process;

[0023] (3) During the reaction process, keep sampling and comparing with the standard sample, the color of the product is similar to that of the standard sample with yellow-brown or reddish-brown shade, and then stop the reaction, and the taken out slurry is filtered, washed, dried, and broke...

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Abstract

The invention discloses a preparation method of iron oxide brown, comprising the following steps of: adding ferrous sulfate and liquid caustic soda into a closed reaction kettle to be mixed to form a material slurry; adding water to adjust the concentration of the material slurry to 10-12%; raising a temperature to a value in a range of 80-85 DEG C and then slowly adding sodium nitrite while introducing oxygen, then starting spraying equipment to sufficiently mix the material slurry, the oxygen and NO which is generated in a reaction process; continuously sampling in the reaction process and comparing with a standard sample; stopping the reaction after the color light of a product is approximate to that of the standard sample; and carrying out filter pressing on the fetched material slurry, washing, drying and crushing to obtain the product. Iron oxide brown produced by the method of the invention has the advantages of stable quality, pure color light, simple synthesis method and convenience for operation.

Description

technical field [0001] The invention relates to a production method of iron brown, in particular to a preparation method of iron oxide brown. Background technique [0002] The molecular formula of iron oxide brown is (Fe 2 o 3 +FeO)·nH 2 O, it is a brown powder, insoluble in water, alcohol, ether, soluble in hot strong acid, at the same time, it has high tinting power and hiding power, good light resistance, alkali resistance, no water permeability and oil permeability. Its hue is divided into yellow-brown, red-brown, black-brown and so on according to different crafts. It is widely used in the coloring of paint, ink, plastic, shoe powder and other products, as well as in the coloring of paint, construction, rubber, plastic, etc. [0003] The traditional iron oxide brown is made by physical blending of iron black, iron yellow and iron red pigments. The quality of the product is unstable and there is a lack of uneven hue. Therefore, the direct synthesis of iron brown prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
Inventor 孙晓庆崔前志
Owner ANHUI MINGZHU PIGMENT TECH
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