Paper
United States Patent Office 1
Published 2017 ยท Eldon Ray De
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Abstract
This invention pertains to a new and novel process for producing extremely pure iron oxide pigments from low grade, inexpensive iron ores, which pigments are neverthe less highly pure and suitable for exacting uses. This in Vention further relates to the controlled production of iron oxide pigments of various colors. Various methods are well known to those skilled in the art for producing iron oxide pigments. One presently popular route is by recovering ferrous sulphate from Waste pickling acids of the steel industry and then calcin ing this ferrous sulphate to iron oxide (Fe2O). Still an other method is to add alkalis to solutions of ferrous iron, Such as copperas, in such a manner as to precipitate iron hydroxide or hydrated iron oxide, which can then be roasted to an iron oxide pigment. It will be noted that the foregoing procedures involve the iron in a solution phase at some point in the processing and the handling of Such relatively large volumes of so lution, caused by the low solubility of ferrous sulphate, can be troublesome or at least costly. Other procedures for producing less pure iron oxide pigments involve simply the addition of sulphuric acid to an iron ore or iron mineral concentrate (acid striking) followed by roasting of the acid-struck mass to the best pigment color possible. In this procedure, however, all the impurities originally present in the ore are obviously pres ent in the finished pigment thus downgrading the pigment for many applications.
The invention provides a novel process for producing extremely pure iron oxide pigments from low grade, inexpensive iron ores, suitable for exacting uses and eliminating impurities.
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