SU1176952A1 - Method of extraction of unburnt fuel from ash - Google Patents

Abstract

1. METHOD FOR ISOLATING HEALTHY FUEL FROM ASH, including: preparing a suspension by mixing ash with water and separating the suspension, characterized in that, in order to increase the yield of unburned fuel due to the intensification of the separation process, 100 May is taken to prepare the suspension. h. ash and 80-110 May. 0.05 0, 1 May are successively introduced into the resulting suspension, with continued stirring. including phosphate dibasic ammonium and 0.05-0.1 wt.h. tetraborny sodium. 2. Sawing method as claimed in claim 1, characterized by the fact that the separation of the suspension is carried out by vibration or flotation, or by vibration with subsequent flotation.

Description

The invention relates to the wet separation of powdered bulk materials using vibrating and flotation devices, and can be used, for example, in separating unburned fuel particles from the ash of thermal power plants (TPPs). The aim of the invention is to increase the yield of unburned fuel due to the intensification of the separation process. Example 1, May 100 including fly ash from thermal power plants obtained from burning coal containing 34.8 May of unburned fuel, is mixed in eNKocTH from 100 May. h of water. In the resulting suspension with stirring, the INI is dissolved at first 0.08 May, h. ammonium phosphate disubstituted, and then 0.08 May. sodium tetraborate and continue to stir for 3 minutes, after which the suspension container is placed on the vibrating plate and vibrated with vertical vibrations to separate the unburnt fuel from the ash and ash glass. The oscillation frequency is 50 Hz, the amplitude of oscillation is 0.5 mm, the time of vibration is 2 min. Then, its contents are defended in the same container for 5 minutes, and water is decanted from the surface of the resulting sediment. The resulting layers of unburned fuel and ash. the glasses are separated one from the other by mechanical stratification by means of knives or scrapers, after which the separated products are dehydrated and dried. Example 2. Proceed as in example 1 with the difference that 100 may. h. ashes take 80 ma.ch. water, 0.05 mach. ammonium phosphate dibasic and 0.05 May. sodium tetraborate. Vibration time 3 min. Example 3. Proceed as in example 1 with the difference that 100 may. h. ashes take 110 m. h of water, 0.10 m.h. ammonium phosphate disubstituted and 0.10 May. h sodium tetraborate. Vibration time 1.5 min. Example 4. The procedure is similar to Example 1 with the difference that a layer of unburned fuel separated from a layer of ash glass is subjected to additional flotation in 5% aqueous emulsion of sulfonated kerosene stabilized with caustic soda before dehydration, and the precipitate ash glass that leaked during flotation combined with its main mass, separated as a result of vibration and layer-by-layer separation of fuel and ash glass. Example 5. The procedure is the same as Example 1 with the difference that after the stage of mixing all the components of the suspension, flotation of unburnt fuel from the ash is used instead of vibration, for which 200 May is added to the suspension. including 8% aqueous emulsion of sulfonated kerosene, stabilized with caustic soda. Example 6. Take 100 May. including the ash of the hydro-removal of thermal power plants, obtained from the burning of coal and containing 15.6 wt.% of unburnt fuel, and consumed its 100 May. h of water. Next poitepayut similarly to example 1. Example 7 (control). It is obtained in the same way as in example 1 with the difference that ammonium phosphate dibasic and sodium tetraboric acid are introduced into the suspension simultaneously. Example 8 (control). Proceed analogously to example 1 with the difference that ammonium phosphate disubstituted was not introduced into the suspension. Example 9 (control). Proceed analogously to example 1 with the difference that sodium tetraboronic acid was not introduced into the suspension. Example 10 (control). Act similarly to Example 1 with the difference that instead suspension foefornokielogo disubstituted ammonium and sodium tetrabornokielogo injected ammonia as egovodnogo raetvora in kolicheetve, eootvetstvuyuschem number ammonia vschel yuschegoe hydrolysis in ammonium phosphate disubstituted to prieutetvii tetrabornokielogo sodium (0.02 May. am ammonia, in a rachechet on anhydrous ammonia). Example 11 (izveetny). Proceed analogously to example 1 with the difference that they do not enter

31176952. 4

Neither ammonium phosphate dibasic - As follows from the data given in the table, or sodium tetrabornocolithic data, the proposed method for comparison with the known one allows the results of research to apply the output of ash from frames 1-11 are shown in the table. 5 unburnt fuel 3-3.5 times.

Claims (2)

1. METHOD FOR ISSUE OF UNBURBED FUEL FROM ASH, including; preparing a suspension by mixing ash with water and separating the suspension, characterized in that, in order to increase the yield of unburned fuel due to the intensification of the separation process, they are taken on May 100 to prepare the suspension. including ash and May 80-110. including water, while in the resulting suspension with continued stirring, 0.05 0.1 may be sequentially introduced. including phosphate disubstituted ammonium and 0.05-0.1 wt.h. sodium tetraborate. 2. The method of pop. 1, characterized in that the separation of the suspension is carried out by vibration or flotation, or vibration, followed by flotation. .SU, 1176952