SU43633A1 - A method of processing sludge obtained by the silicole process of hydrogen production - Google Patents

Description

In the production of hydrogen for the purposes of aeronautics in the field, a so-called alkali-silica method, which is widely known to aeronautics, is used. As a result of the reaction in special generators between ferrosilicon (silicone) and hot sodium hydroxide solution, hydrogen is released, and in the generator it remains a mass which, when cooled, is sintered in dense pieces. Usually, before the mass is cooled, the generator is washed off with water from this residue. The gas production process is carried out periodically. This residue is not used further. In Taylor’s book, Hydrogen Production, ed. 1930 pp. 119-120, it is indicated that the residual solution has all impurities: caustic soda, mainly sodium carbonate, and also ferrosilicon, iron oxide and sodium aluminate.

In addition to this indication, no data is available on the use of the components of the solution separately.

The author proposes the separation of a mixture of compounds contained in this solution, with the production of mainly iron, ferrosilicon, and soluble glass.

In the present method, immediately upon completion of the reaction in the generator, the residue is discharged into iron or

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wooden tank of sufficient capacity for one load; the tank should be filled with water at the rate of dilution 1: 2 - the remainder water (by volume). Mixing is desirable to accelerate the formation of a uniform suspension. The heavy constituents of the ferrosilicon solution and metallic iron settle to the bottom of the tank. The liquid portion is led through a siphon tube into an electromagnetic filter that traps the iron from the solution.

As a result, the purified solution will present soda glass with some excess alkalinity; its concentration is 40-50 ° Be, depending on the concentration of caustic used in the gas production reaction and the degree of dilution with water. The modulus of soluble glass is about 1.2 to 1.7 g. najv The solid residue after removal of the liquid solution is washed 4-5 times with water and discarded for the essence or into drums or simply on the tables. Washing should be thorough enough that no alkali is left in the sediment.

Drying is very easy and fast. The dried solid portion of the precipitate is allowed to sieve to separate the fine iron from the large particles, which are mainly unreacted ferrosilicon. Separation at appropriately sized screen openings goes fast.

The resulting parts are fed after sieves to magnetic drum separators, where the magnetic part (iron) is separated from the non-magnetic sludge (ferrosilicate). Often on the surface of ferrosilicon iron particles are in an adherent state, therefore they should be removed so as not to contaminate the ferrosilicon simply by rubbing it.

The small magnetic part will be mainly iron, the nonmagnetic and coarse-ferrosilicon will be large and small.

Suspended iron particles collected from the solution are attached to the batten, to him the solid residue.

The yield of the product. Out of every 4000 kg of residue, this method can be obtained:

1) about 6000-10000 kg of soluble glass with a modulus of 1.2-1.7 and a density of 40-50 ° Be, which can be used as an additive in soap making, to clean the oil from excess acidity, to cover roads using a method of ground dowel, making a non-cut plaster in homes, both inside and outside, to obtain silica gel with good adsorption properties, as well as for other purposes;

2) fine-grained iron, perfectly attracted by the weakest magnet (grain of its size 0.05 to 0.2 mm), may well be used in chemical and physical laboratories as a reagent for experiments. Output 300 kg;

3) ferrosilicon, obtained back in its pure, regenerated form, is used again in the reaction to produce new quantities of hydrogen. Depending on the initial products and grade of ferrosilicon, it is regenerated from 10 to 20% of the initial amount of ferrosilicon.

The subject matter of the invention.

The method of processing the sludge obtained by the silicole process for the extraction of hydrogen, characterized in that the sludge is dissolved in water, filtered, the filtrate containing sodium silicate, after electromagnetic separation of iron, is evaporated, and the residue on the filter after washing and drying is divided into iron and ferrosilicon by sieving and electromagnetic separation.