SU59054A1 - The method of obtaining soda or potash and sulfuric acid from alumina-containing raw materials - Google Patents

Description

A1, Oz 2SiO2 2H, O. + R, SO.i -f CO + Hz

resulting in the formation of nepheline-type compounds from kaolin, with release of SOj. This compound is formed due to alkali sulfates of alkali metals, which are reduced in the process of hydrothermal treatment of the above mixture, with aqueous gas to sulfur compounds, which, in turn, under the total action of superheated water vapor and constituents of kaolin, release hydrogen sulfide burned in the long-range RjO - Al.Og 2SO2 -f ЗНаО + SOa + СО

shem in the furnace, with the formation of SO, and N.O.

Alkali-liberating sulfate acts on a molecule of kaol-initoic acid, which under the action of high temperature affects AlgOj and SiOa to form ALO and RoO SiOj, which in turn react with each other to form a nepheline compound of R, O type. A1, Oz. 2SiO ,.

This transformation takes place almost completely within about 1 hour of heat treatment under the conditions mentioned above, since in the resulting product only small amounts of sulfur compounds are found that do not interfere with the distance. n-e | ne if y-technological process. ;; Gases containing A30 that are released from the furnace are converted into sulfuric acid in a known manner. By . A lumpy nepheline-type compound is processed by a known alkaline SP01Sob (sintering with lime) to alumina, soda (or potash) and cement with the same characteristics that characterize the sintering process of nepheline concept limestone.

As a result of the complex process, all components of the raw material are fully utilized: kaolin (clay) and the like, sulfate (in alkali metals and limestone by obtaining valuable products (soda or potash, alumina, sulfuric acid and cement).

The advantage of the proposed method over the known ones is that the resulting aluminate solutions are free of sulfuric or sulfuric acid compounds, and the resulting soda or potash (due to alkali sulfates of alkali metals) are free from sulfur compounds and do not require additional purification, which is not achieved by using known methods, since the aluminate solutions obtained in them are heavily polluted with either sulfurous or sulphate compounds, so that the final products — soda or potash — are obtained with significant A mixture of sulfur compounds and require additional heating. In addition, the proposed method can yield alumina, while sintering the resulting nepheline-type compound with limestone, up to 85-90%, while by known methods the alumina output ranges from 65-80%.

These circumstances are the reason that the previously proposed methods have not yet been commercialized.

When the alkali metal sulfates in the proposed process are replaced by their Chloxes, the complex process proceeds as described, with the difference that hydrochloric acid is obtained instead of sulfuric acid.

The subject matter of the invention.

Claims (2)

1. A method of obtaining soda or potash and sulfuric acid from alumina-containing raw materials by npoKajfaiBani mixture of the latter with sodium or potassium sulfate at 1000-1100 ° in an atmosphere of water vapor, so that with the aim of complete Sulfur extraction from the charge, the sintering process is carried out in a reducing gaseous medium, after which the sodium or potassium aluminosilicate thus obtained is processed into alumina and alkali using the known methods of aluminum technology. 2. A method according to claim 1, characterized in that, in order to by-pass hydrochloric acid, sodium sulfate is partially or completely replaced in the mixture with chlorides, alkali metals.