SU51907A1 - The method of obtaining pink paint for porcelain and similar masses - Google Patents

Description

in recent years, rose-colored porcelain has become widespread. The literature describes several methods for producing pink dye, consisting in the fact that the nitric acid or sulfuric acid compounds of manganese, together with various aluminum compounds, are treated at low or high temperatures with phosphoric acid compounds. Some dyes contain gold. All these methods require a large consumption of expensive w, their reagents and difficult in their practical application.

The proposed method consists in the fact that the initial raw material — alumina (with a minimum content of coloring impurities — iron, titanium, etc.) is carefully shifted at ordinary temperature with manganese chloride and a phosphate-sodium salt (disubstituted) or directly with manganese phosphate and calcined at 1200-1400 °.

The burned mixture is a raw dye, the dyeing properties of which can be significantly improved by treating the raw dye with aqua regia, according to which the dye is washed and dried.

In this treatment, in pacTi er, the transition, almost completely, of the manganese and phosphorus compounds present in the raw dye.

The pure pink dye is alumina containing a small amount (less than 1%) of manganese. Tsarska vodka and wash waters, which contain, almost completely, the manganese and phosphoric acid required for the new process, are treated with soda, and manganese associated with phosphoric acid precipitates. After separating the precipitate from the solution and washing it, the precipitate may be mixed with a new amount of alumina. The mixture after calcination will give again a pink dye, from which, by treatment with aqua regia, manganese and phosphoric acid compounds are recovered, which can be reused.

Thus, the main amount of manganese and phosphoric acid compounds involved in the process (the amount of which must be taken in excess against the ratios required by the reaction) is continuously released.