Production process of low-viscosity iron oxide yellow

Abstract

The invention discloses a production process of low-viscosity iron oxide yellow, and belongs to the technical field of iron oxide yellow production. According to the process, water is added into an iron oxide yellow filter cake, pulping is conducted at high temperature, and an assistant is added in the high-temperature pulping process for dispersing to obtain dispersed slurry A, wherein the assistant is selected from one or more of a dispersion wetting agent and an active dispersing agent. In the process, the viscosity of the slurry is rapidly and effectively reduced and the surface characteristics of the slurry are changed in the pulping process through the assistant. Then the obtained dispersed slurry A is dispersed and ground by using a grinding device, a leveling agent is continuouslyand uniformly added in the grinding process, and grinding and leveling are performed to obtain dispersed slurry B, wherein the leveling agent is selected from one or more of acrylic acid leveling agents and organic silicon leveling agents, the wettability, smoothness and anti-blocking property of the slurry are effectively improved by utilizing leveling dispersion, and finally, the low-viscosity iron oxide yellow is prepared through filter pressing, rinsing, drying and crushing.

Description

technical field [0001] The invention relates to the technical field of iron oxide yellow production, in particular to a production process of low-viscosity iron oxide yellow. Background technique [0002] Iron oxide yellow is also called hydroxyl iron, or iron yellow for short. Its color varies from lemon to yellow-orange depending on the grain size, and the particle size is between 0.5-2 μm. It has very good light resistance, atmospheric resistance and resistance alkaline. The hiding power reaches 10-12g / m2, which is higher than all other yellow pigments, and the coloring power is also very strong. Iron oxide yellow is widely used in building materials, coatings, paints, plastics, rubber, electronic materials, industrial catalysts, tobacco, cosmetics and other fields. [0003] The wet sulfate oxidation method is widely used in the industry to produce iron oxide yellow. The process is specifically as follows: ferrous sulfate oxidation method sulfuric acid reacts with iron ...

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Problems solved by technology

[0004] Industrially, iron oxide yellow pigments are prepared in an acidic system (PH=2.5-3.5), and the pigment particles themselves will absorb or entrain some fine particles and acidic liquids. The acidic liquid will be washed away, and the PH value will increase slightly (PH=3.5~4.5), but there will still be a small amount of small particles and acidic liquid in the iron yellow pigment, plus the mutual agglomeration between the pigment particles and the particles themselves Factors such as rough surface and rough surface make iron oxide particles exhibit greater anti-flow performance, which makes the viscosity value of industrial grade iron oxide yellow generally high

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