Sulfur is contained in the coal, usually in the form of sulfide (FeS
2
, etc.).
(Sulphate FeSO
4
et al.) And complex organic compounds. According sulfur coal
divided into sulphide (SK) sulfuric (SS) and organic (Sorh).
Reducing the sulfur content in coke 1% gives fuel savings of 10-20% and
increases productivity by 20-30% blast furnace. In an even greater extent the harmful
effects of sulfur is determined during processes such as special molding, preparation
of electrodes, activated carbon production, and so on. P.
In this regard, the fuel characteristics in terms of sulfur content in it is of great
practical significance. Most spend determination of total sulfur in coal (Szah). The
method consists in the fact that the studied sample fuel is burned together with a
mixture of magnesium oxide and sodium carbonate (mixture Eshke). This binds the
sulfur in the form of magnesium sulphate and sodium. In the sodium sulfate passes
with sulfate and sulfur contained in coal. When leaching alloy formed by water soluble
sulfates. Then determine the sulfur content by weight besieged it in the form of barium
sulfate barium chloride. This method is used in determining sulfur and brown coal,
anthracite coal, oil shale and peat.
In pre-weighed in analytical weight porcelain crucible diameter and height 38,5-
46,5 28,5-36,0 mm fuel sample taken in quantities of 1 ± 0,1 g accuracy weighing
0.0002 g sample in the crucible of fuel adds 2 g of a mixture Eshke and after careful
conveying cover the contents of the crucible 1 g mixture. Take a sample of the mixture
to within 0.1 g crucible placed in a cold oven muffle, which gradually (for 1 -2 hrs.)
Heated to 800 ± 25 ° C and calcined at this temperature for at least 2 hours. Then the
pot is removed from the oven, cooled, its content is transferred to a glass with capacity
of 300 cm3, carefully washing crucible wall hot distilled water, then adds 100- 150
cm3 of hot distilled water and heated to boiling. If the surface of the water float
unburned fuel particles, the determination must be repeated again. [7]
The contents of the beaker was decanted through a filter into a second beaker
with a capacity of 500-600 cm3 residue in the glass thoroughly washed three times
with hot distilled water and transferred to a filter which is washed with a jet of hot
water washing, muddy sediment. Next precipitated barium sulfate chloride solution in
the presence of methyl orange and three drops of HC1 to weakly acid reaction.
Percentage of total sulfur in the test fuel is calculated using the formula:
Szah=
G
1
*0.1373*100
G
(5)
where where G - coal sample, g;
G1-weight of barium sulfate, g;
0.1373 - coefficient to convert the masses to ВaSO
4
weight sulfur.
Typically in the resulting mass of barium sulfate amending the content of sulfur
in used chemicals.
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