SU106836A1 - The method of obtaining magnesium oxide for high refractories - Google Patents

Description

Oxide f; iritHJi, obtained from natural magpezitop (for example, by calcining satkapp magnesite), contains 1--, calcium oxides, which reduces the service life of the magpezial refractory articles manufactured from it, 1И11.

A method of obtaining papine oxide magpi from Sivania brine ((; ensuring more ntiicoKyto purity of oxide) is proposed. In addition, the refinement of this method allows the southern regions of the country to be local (a very high product, necessary for the use of metal;);

The production of magnesium oxide from Sivai1a by treating it well by the usual method results in a whole harder than 1PT. Siva1nska brine contains sulphates, and this is carried out by processing its extracts) to the release of gypsum contaminating magnesium oxide (the preliminary desulfation of the brine is required); one should use pure initial limestone and its high-quality calcination (to reduce the calcium oxide content in the final product to minimum); when washing gndrooknsi magnesium from ballast salts, it is contaminated with cargunlt calcium.

All of these complications are eliminated by using a simple technique of carbonating a hypomagnesnal mixture in a solution of 11.5% sulfate slug, preferred, and its conversion of gypsum to carbonate.

The sunshine of the proposed method consists in the following.

From the p; IP) with a lime mob.

a mixture that is subjected to felting the flue gases of calcareous HC4eii.

During carbonization, magnesium bicarbonate goes into solution, and gypsum precipitates. For the prevention of carpaceous gypsum, carbonaceous mixture dispersed in a 11.5% solution of magnesium sulfate is subjected to carbonization.

Magnesium carbonate is separated from the solution by precipitation by heating the liquid to a boil, or by treating back to magpi. The isolated product is filtered, dried and rolled; 1. Gypsum, taught as waste, is used for various purposes.

And the proposed method of obtaining magnesia from Sivash brine can be used with brine of any kind, without prior desulfating it, as well as with ordinary builders.

The optimal conditions for the production of magnesia are in the subsequent experiment carried out by the following operations:

1. Getting ginsomagpezialnoy mixture.

2.Dispersion of the hypomagical-desolate party, given in a solution of magnesium sulphate, SODI, RI 11, G, (V, at 1H) expensive (I1I1G m pulp 3-3.5% Mg (Oll), j mg Festochet PA MgO. The yield The liquid phase in the liquid phase is 87-90% at a pressure of 100% carbon dioxide in 3 atm of 40% gas at 7.5 at. The duration of carbonization under these conditions is 25-30 minutes, during which the liquid phase about 85% of magnesium is transferred, and the concentration of magnesium carbonate is 30-35 g / l in terms of MgO.

3. The release of basic magnesium carbonate by a 30-minute cue. bicarbonate solution when it is injected and in direct steam.

4. Filtration, drying and calcining of magnesium carbonate in a typical apparatus in a known manner.

Subject matter

The method of obtaining 1 and magnesium oxide for high-refractories from natural sulphate solutions of magnesium salts, precipitating from UTIC solutions with a lime with a mixture of magnesium hydroxide and calcium sulfate, after | L1i. ) Silica1 (t pmspmagis: 5I; 1spa mixture to obtain soluble magnesium bicarbonate and a tree by heating it into basic magnesium salts, characterized in that in order to prevent the carbonization of gypsum and to obtain magnesium oxide containing up to 1% of calcium oxide, the hypomagnesium mixture is carbonized in a solution containing 11.5% sulfate magic.