SU43416A1 - Leaching of potash from ash - Google Patents

Description

The proposed method of extracting potash from ash relates to leaching potash from sunflower ash; however, this method can equally well be extended to leach out other soluble salts from plant and animal ash.

From the time of production in the USSR, drawing from ash anywhere in the literature does not mention any special, special preparation of ash when leaching potash and other salts from it. Usually, in one way or another, the resulting ash is subjected to leaching with water in wooden or iron tanks (extractors) with a false bottom in its natural air-dry state. And only recently, namely in 1933, in the book by V.E. Metelkina and K.A. Kuznetsov “Production of potash and harvesting ashes - on page 62 it is stated:“ Potash plants must subject the ash to pre-lock and only after that load it into leaching tanks and further, on page 37: “The ash should be soaked a day before it is loaded into the tanks with such amount of water (40-45% of the weight of the ash) so that it is moist, but not sticky.

It also says: “... you need to soak in hot water. The soaked ash must be kept warm, otherwise the whole process will be useless. Limit it (60)

everything that is currently available in the literature regarding the preparation of ash for leaching.

The proposed method consists in the following:

1) air-dry ash is moistened with cold (from the aqueduct) water, which takes about 30%;

2) wetted ash is aerated by blowing air through it for about one hour;

3) wetted and aerated ash to leach remains to lie no more than 18 hours (from 6:00 to 18:00) in order for it to completely go through the main physical and chemical processes - hydrolysis, coagulation and oxidation, which determine the success of leaching. The whole preparatory process is very simple, accessible and feasible without the participation of any reagents, catalysts, etc.

The following data clearly characterize the advantages of the proposed method for the preparation of ash:

This method of preparation of the ash after testing it in the factory is introduced into the practice of the Armavir Plant of Azcherhimtrest.

New in the proposed method is the aeration of ash, previously moistened with an optimal amount of cold or hot water, as a result of which the leaching time is reduced by more than three times with increasing yield. However, the liquors obtained are more concentrated and transparent, which reduces the fuel consumption for the residue.

lye and calcining potash and provides high (export) quality of the final product.

The subject matter of the invention.

The method of extracting potash from ash using preliminary wetting of the ash with water before extracting it with water is the same, characterized in that after preliminary wetting the ash is subjected to air blowing, and then it is subjected to extraction.