Method for producing red iron oxide pigment

Abstract

The invention relates to a method for producing a red iron oxide pigment. The method has the main points: adding water into waste iron vitriol dregs for coarse washing, dewatering the waste iron vitriol dregs with a frame filter press, placing the dewatered waste iron vitriol dregs in a drying oven for drying at 120 to 150 DEG C for 3 to 5 hours; and cooling the iron vitriol dregs, crushing the cooled iron vitriol dregs and filling the crushed iron vitriol dregs in a porcelain boat, placing the crushed iron vitriol dregs in a high temperature calciner for calcination treatment at a temperature of 550 to 650 DEG C for 2 to 4 hours, absorbing furnace tail gas SO3 with 60 percent sulfuric acid to produce more than or equal to 98 percent concentrated sulfuric acid, and absorbing residual air after absorption with sodium hudroxide. Powder formed by calcining the iron vitriol dregs is washed, and the temperature is controlled to be 60 to 90 DEG C; after being washed, the powder is dewatered by the frame filter press and then enters the drying oven to be dried at a low temperature of 120 to 150 DEG C for 2 to 3 hours; and the dried powder is passed through a 150 mesh sieve to obtain a finished product of the red iron oxide pigment. The method emphasizes environmental protection in a production process and has the characteristics of low energy consumption, short production flow, easy mastered process, stable product quality, change of waste into valuable, and the like.

Description

technical field [0001] The invention relates to a production method of chemical products, in particular to a method for producing red iron oxide pigments from waste ferrite slag as a raw material. Background technique [0002] Iron oxide red is widely used in colored bricks and tiles, colored cement, architectural coatings and paints, inks and other industries. At present, the production of high-purity iron oxide red in my country mostly uses high-purity low-carbon steel flakes or finished high-priced iron salts as raw materials. It is difficult to collect such raw materials, the source is uncertain, the price is relatively expensive, and the quantity is very small. There are also some iron oxide red production methods that use iron-containing industrial waste residue, slag, iron mud, etc. as raw materials. Most of these methods need to go through acid-dissolving, magnetic separation and other treatment processes, and the production process is long and energy-consuming. [...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned deficiencies, the purpose of the present invention is to provide a production method of iron oxide red pigment in the art, so that it can solve the problem of high energy consumption, long production cycle, complicated process and high production cost of existing similar products. relatively high technical issues

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