Brown Iron Oxide

Brown Iron Oxide Description

Brown iron oxide is a pigment composed of red iron oxide and yellow iron oxide, a small amount of black iron oxide can be added if needed. Depending on the production process, the color phase can be yellow brown, red brown, black brown, etc… Because the dispersion is roughly the same, they can be mixed evenly. It has the characteristics of iron oxide red and yellow iron oxide pigment, such as the strong coloring and covering power, and the functions of heat resistance, alkali resistance, acid resistance. Of course, it also has the same applications as most iron oxide pigments.

Item Unit Index Value Test Method
Contents(α-FeOOH) % ≥88 ISO1248
Oil absorption ml/100g 25-35 ISO787-5
Res.on 325 mesh % ≤0.3 ISO787-7
Water soluble salts % ≤0.5 ISO787-3
Moisture % ≤1.5 ISO787-2
PH value 4-7 ISO787-9
Ignition loss(1,000℃,1/2h) % DIN55913
Bulk density g/cm³ 0.5-0.8 ISO787-11
Specific gravity g/cm³ 4.7 ISO787-10
Particle size BET µm Irregular Eletron Micrographs
Dispersibility(Hegman) µm ISO787-20
Tinting Strength(Compared with Standard) % 95-105 ISO787-24
Color Difference ΔE (Compared with Standard) ≤1.0 ISO787-1

   Item/Colour Alta   

Primary Color

Dilute Color(TiO2: brown iron oxide=5:1)

 Iron Oxide Brown 610

 Iron Oxide Brown 663

 Iron Oxide Brown 686

  • Ferrous sulfate oxidation method. Ferrous sulfate reacted with soda ash, after washing, filtering, drying, crushing and mixing, the pigment is prepared.
  • Mechanical mixing method. It is made of iron oxide red, yellow and black through mechanical mixing.
  • An energy-saving and environment-friendly preparation method. First, add the mother liquor of iron oxide red and iron oxide yellow to the oxidation barrel, which can turn waste into treasure and improve resource utilization. Then add polymer composite alkali solid to water to prepare saturated solution. Third, pour air into the oxidation tank, add the prepared polymer composite alkali saturated solution, make the PH value of the solution be 7.5 to 13, and perform oxidation reaction for 2 to 5 hours to obtain a mixture. Finally, the obtained mixture is filtered, rinsed, dried and crushed to obtain brown iron oxide pigment.
  • A liquid phase low heavy metal iron oxide brown. Add the purified ferrous sulfate solution with a concentration of 400g/L to the pressure reactor, pour nitrogen into the reactor to drive out the remaining air in the reactor and fill the remaining space of the reactor. Then close all valves of the reactor, heat the reactor and turn on the stirring at the same time, control the temperature of the reactor at 90℃ to 120℃. Third, use a pressure pump to inject lye with the same concentration. Control the PH value at 6.8 to 7.3 under the pressure and temperature at this time. Turn on the stirring, continue to raise the temperature and control the temperature at 90℃ to 120℃, the heating rate should be controlled at 2-6℃per minute. When the temperature rises to 90℃- 120℃, heat preservation is performed, keep the time within 2-5 hours. After the heat preservation is completed, use cold circulating water to quickly coll to room temperature, open the valve, rinse the brown slurry, press filter, dry and crush to get brown iron oxide powder.

Applications of Brown Iron Oxide

Uses in bricks
Uses in bricks

As a pigment, brown iron oxide is widely used for the coloring of paint, ink, shoe powder, building material, rubber, plastic and other products.
Know the raw material composition of the product from the production process of iron oxide brown, so as to determine the performance structure of the product and which industries it can be used. In order to ensure the safety of product operation, the storage and uses must be carried out in strict accordance with the specified operating requirements to avoid accidents and threats to operators.

Brown Rubber Floor Adhered
Uses in asphalt road
Brown Rubber Floor Adhered
Use in rubber floor
Brown Wall
Uses in paint and coating
Brown Masterbatch
Uses in plastic masterbatch

Advantages of Brown Iron Oxide in Chemate

  • High coloring power and hiding power
  • Excellent light resistance, weather resistance and high temperature resistance.
  • Strong coloring force and good dispersivity.
  • High purity, high saturation, high tinting power

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