SU1255629A1 - Method of producing inorganic ferroxide pigments - Google Patents

Description

The invention relates to the technology of inorganic pigments, namely iron oxide pigments, and can be used in the chemical and paintwork industries, as well as in non-ferrous metallurgy in the processing, utilization and neutralization of chloride production wastes.

The aim of the invention is to increase the dispersion of the target product.

Example 1, A solution containing 100 g / l of ferric chloride is treated with alkali Up to pH 7, the resulting pulp is filtered out, the precipitate is dried at 90 ° C, then dispersed in water at, filtered off again, washed of chlorine, dried at 105 C and calcined at 600 ° C. The resulting pigment contains 97% of a fraction of -0.1 mm, which is directly used to make paints and enamels. The remaining 3% in the pigment is a fraction of +0.1 which is refined before use.

Example 2, Solution after being more diluted with sublimates of titanium chlorinators, -containing, g / l: iron 10.6; aluminum - 10.3; titanium 2.8; zirconium 1,2; chromium 0.1; manganese 0.1; sodium and potassium 14.2, treated with alkali to pH 6.0. The resulting pulp is filtered off, the precipitate is dried at PO ° C, then disintegrated, washed from chlorine ion, dried again and calcined at 500 ° C. The fraction content is 0.1 mm in the resulting product is 98. This pigment is not edited by N. Gun'ko.

Compiled by L. Romantseva

Tehred L.Oleynik Proof-reader I.Erdey

Order 4786/29 Circulation 644 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

It is mediocre for paints and enamels.

Example 3. The solution obtained by complex processing of the spent melt of titanium chlorinators, contains 40 g / l of iron and up to 150 g / l of sodium, potassium, calcium, magnesium, manganese chlorides. It is treated to pH 8.0 with alkali, the pulp is filtered out, the resulting precipitate is dried at 120 ° C, then the dried precipitate is pulverized, filtered, washed away from chlorine ion, dried again and calcined at 800 ° C.

In this case, the content of the fraction

-0.1 mm is in pigment 99. The pigment is used to make paints and enamels for a wide range of purposes.

Iron oxide pigments obtained by the proposed method, according to the basic properties, meet the requirements of the technical specifications for red iron oxide pigment grade 1 and have a pH of a water extract of 6.5-7.5, a water content of 0.4-0.8, an opacity of 5-7 g / l, dispersibility in drying oil for 20–30 min, oil absorption capacity of 20–30 g / 100 g of pigment. The color of the pigments preferably varies from orange-red to crimson depending on the calcination temperature.

This invention provides pigments with a high dispersion and allows the use of such pigments directly to obtain paints and enamels without further grinding.

Claims (1)

METHOD FOR PRODUCING · INORGANIC IRON OXIDE PIGMENTS, including treating a solution containing iron (111) chloride with an alkaline reagent, filtering the resulting pulp, washing, drying and calcining the precipitate, characterized in that, in order to increase the dispersion of the target product, the filtered precipitate is washed before washing. SU, 1255629