Preparation of iron oxide black from waste acid and ferrous sulfate by-product of titanium dioxide

Abstract

The invention discloses a method of preparing iron oxide black by using waste acid and ferrous sulfate as a by-product of titanium dioxide, adding an alkali solution to the waste acid and waste liquid as a by-product of titanium dioxide, adjusting the pH, adding ferrous sulfate for beating treatment, and the beating treatment is completed After standing for stratification, the sediment and oxidation aid are added to the reaction vessel, air is introduced, the reaction solution is cooled by heating and stirring, the neutralizing agent is added to adjust the acidity value, the finished product is filtered by suction, dried and pulverized. The method of the present invention for preparing black iron oxide by using waste acid and ferrous sulfate as a by-product of titanium dioxide not only handles the discharge and waste of by-products of titanium dioxide, but also utilizes the waste to prepare black iron oxide pigment, thereby realizing the recycling of waste The iron oxide black pigment prepared by the method of the present invention has pure color, short reaction time, low reaction energy consumption, strong coloring power of the product, and the product yield is 96-98%.

Description

technical field [0001] The invention relates to a method of preparing iron oxide black by using waste acid and ferrous sulfate as a by-product of titanium dioxide, and belongs to the field of iron oxide pigment preparation. Background technique [0002] As an industrial raw material, iron oxide black is also used in a large amount in watercolors and inks. The special magnetic toner for copiers is needle-shaped iron oxide black. In addition, iron oxide black is also used in the production of high-end cosmetics in France and Japan because of its non-toxic and non-polluting characteristics. [0003] In the traditional preparation of iron oxide, the source of iron salt is iron scrap, iron sheet and sulfuric acid or hydrochloric acid. The iron salt obtained by this method is relatively pure, and basically does not need purification treatment, but the cost is relatively high. Most of the iron black manufacturers in my country use this method. In recent years, the research on iro...

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Problems solved by technology

However, no matter it is the reduction method or the precipitation method, the impurities cannot be completely removed, and the obtained product is reddish.

[0004] Generally, the production method of iron oxide black is nothing more than neutralization and oxidation. According to the addition ratio of ferrous ions and ferric ions in ferric sulfite, an appropriate amount of ferric oxide is added according to this ratio during the preparation process. , at 95-105°C for addition reaction to generate ferric oxide. The large-scale old factories in my country all use the addition method. During the reaction process, iron yellow leftovers are added in stages, and ferrous and lye are used in drums. Oxidation in air, long reaction time, high energy consumption, light coloring power of the product