Method for reducing viscosity of ferroferric oxide

Abstract

The invention discloses a method for reducing viscosity of ferroferric oxide. The method comprises the following steps: performing the water adding, the beating and the dispersing on an industrial-grade ferroferric oxide filter cake material, adding the above ferroferric oxide and water to a reaction barrel so as to form serous fluid of which the concentration is 15-25%, controlling a temperatureto be 85-90 DEG C, and adding alkaline liquor to control a PH value of feed liquid to be 9.7-9.9, and stirring in a high speed for 2-3 hours. The method is simple, the ferroferric oxide can be rapidlyreduced without adding any metal ions or oxides, and the viscosity of the ferroferric oxide can be reduced to 40-50 KU.

Description

technical field [0001] The invention relates to a method for treating ferric oxide, in particular to a method for reducing the viscosity of ferric oxide by controlling certain slurry concentration, pH value, temperature, stirring speed and stirring time. Background technique [0002] Ferroferric oxide, also known as hydroxy iron or iron yellow for short, is an oxide with relatively stable chemical properties. The chemical formula is Fe 2 o 3 ·H 2 O or FeOOH, in the form of yellow powder. The color is a vivid, pure ocher yellow with shades from lemon to orange. It is a needle-shaped hydrated compound with strong hiding power, high coloring power, non-toxic, light resistance of 6-7 grades, insoluble in alkali, slightly soluble in acid. Ferroferric oxide is widely used in building materials, coatings, paints, plastics, rubber, electronic materials, industrial catalysts, tobacco, cosmetics and other industries. [0003] In industry, currently most manufacturers in China us...

AI Technical Summary

Problems solved by technology

The reason: the iron flake method is relatively mature. The advantage is that the pH value in the reaction process is automatically maintained and stable after the internal reaction of the system without external control. The color of the product is relatively controllable and stable. The disadvantage is that the reaction time is long and generally requires 2-3 Today, it is cumbersome and labor-intensive to put the iron flakes into the barrel and clear the barrel. In addition, the iron filings and impurities in the final product are high

[0004] The disadvantage of the above method is that when the surface of the iron yellow is treated with an inorganic charge modifier, a low concentration of transition metal ions is added. Although it is reported that there is no color shift phenomenon, this will make the heavy metal ions of the pigment exceed the standard. , which more or less affects other performance, and the use occasions will be subject to certain restrictions