Method for producing iron oxide black

Abstract

The invention relates to the producing method of a kind of oxidized iron black. It includes following steps: add ferrite watery solution into neutralization action pot, add ammonia and mix round watery solution to neutralize it to prepare hydroxidized ferrous gelatin, transmit the produced gelatin into oxidizing reaction pot; send oxygenous gas and meanwhile heat gelatin to make it oxidated, after reaction we can get oxidized iron oxide black pulp; separate iron oxide black and mother liquor in pulp; make the separated iron oxide black water washed, sieved, dried and comminuted orderly to get finished products. This method adopts liquid phase method to make its reaction rate greatly improved, the particle granularity of oxidized iron oxide black finished products even; it has higher pigmentation strength, and the obtained product contains 96.5% Fe3O4. Compared with the industry appointed standard sample, its pigmentation strength is 200% - 250%; ulteriorly make offal in producing titanium oxide powder as material of this method, which is beneficial to circulation usage of industry waste material and environmental protection, and can greatly reduce producing cost.

Description

technical field [0001] The invention relates to a production method of a pigment, in particular to a production method of a high tinting strength iron oxide black pigment. Background technique [0002] Iron oxide black pigment, commonly known as iron black, the main component is ferric oxide, the molecular formula is Fe 3 o 4 , or Fe 2 o 3 .FeO. The production method of the existing iron oxide black pigment generally adopts the direct addition method. This process is to use the leftovers from the production of iron red or iron yellow as raw material, add ferrous sulfate and caustic soda, the pH value is 7 to 8, and the temperature is Iron black is produced by addition and dehydration at 90-100°C. The disadvantage of this process is that the primary particle shape of the obtained iron black product is inconsistent, the particle size is large and the distribution is very uneven, and the hue is reddish or reddish when used as a pigment. Yellow phase, low color saturation a...

AI Technical Summary

Problems solved by technology

The production method of existing iron oxide black pigment generally adopts direct addition method, and this technology is to use the leftovers of producing iron red or iron yellow as raw material, add ferrous sulfate and caustic soda, the pH value is 7~8, the temperature is Iron black is produced by addition and dehydration at 90-100°C. The disadvantage of this process is that the primary particle shape of the obtained iron black product is inconsistent, the particle size is large and the distribution is very uneven, and the hue is reddish or reddish when used as a pigment. Yellow phase, low color saturation and tinting strength

In addition, in the existing production of titanium dioxide, every ton of titanium dioxide produced will produce 3-4 tons of waste residue containing ferrous sulfate, causing serious environmental pollution