Process for synthesizing iron oxide brown

Abstract

The invention discloses a process for synthesizing iron oxide brown, comprising the following steps of: feeding a ferrous sulfate solution into a reaction kettle; slowly adding caustic soda liquid in three times; then heating to a temperature in the reaction kettle of 75-78 DEG C and incubating for 50-70 min; adding water to dilute mixed slurry until solid content of the mixed slurry is 8-10%; slowly adding sodium nitrite into the reaction kettle and introducing oxygen simultaneously; then turning on spraying equipment to sufficiently mix the slurry, oxygen gas and NO which is generated in a reaction process; continuously sampling and comparing a sample with a standard sample in the reaction process; stopping the reaction when the colored light of a product is similar to the yellowish-brown or reddish brown colored light of standard sample; and carrying out plate pressure filtration, washing, drying and crashing the taken-out slurry so as to obtain the product. The iron oxide brown produced by the invention includes brownish red iron oxide brown and brownish yellow iron oxide brown. Compared with the traditional method for preparing the iron oxide brown by physically mixing iron oxide red, iron oxide black and iron oxide yellow, the iron oxide brown produced by the invention is stable in quality and pure in colored light, the synthesis method is simple and the operation is convenient.

Description

technical field [0001] The invention relates to a production method of iron palm, specifically a synthesis process of iron palm. Background technique [0002] The molecular formula of iron palm 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 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 performance of directly synthesized iron brown products is better than...

AI Technical Summary

Problems solved by technology

[0003] Traditional iron 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 performance of directly synthesized iron brown products is better than that of physical mixing. product

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