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- SINGAPORE
Sulfur
Sulfur is used for the development of leaves and production of chlorophyll.
Fertilizers with sulfur are more and more requested. This is due to regulations on sulfur rejects leading to less and less acid rains, but on the other hand, sulfur became less and less abundant in the soils
Sulfuric acid plant
SULFURIC ACID
Sulfuric acid is a key ingredient in the fertilizer industry – contributing for the majority production of phosphoric acid.
Sulfuric acid is made from liquid sulfur. Filtered liquid sulfur is fed to the sulfur furnace by sulfur pumps. The technological gas leaving the sulfur furnace is sent to the waste heat boiler. From this, technological gases are fed to the first bed of the convertor where oxidation of SO2 to SO3 takes place. The converter work in adiabatic mode with intermediate cooling of gases between beds. After first stage of conversion, cooled process gas is fed to interpass absorption tower where SO3 absorption takes place. After theinterpass absorption tower, the gases are fed to the convertor for second stage of conversion. After second stage of conversion, process gases are sent to final absorption tower where SO3 absorption takes place. Off-gases are discharged to atmosphere via stack.
References:
Kazphosphate (2 000 MTPD)
Epsomite
EPSOMITE
The magnesium sulfate heptahydrate, also named Epsomite, is the result of the reaction between magnesium oxide and sulfuric acid.
Magnesium oxide powder is mixed with water in a tank and transferred into an isothermal reactor in which sulfuric acid is added and reacts with magnesium oxide. The magnesium sulfate liquor is through the press filter. The filtered magnesium sulfate solution is sent to the DTB crystallizer. The crystals slurry is discharged in a thickener (hydrocyclone or gravity settler) and the centrifuge (pusher type) and the Epsomite crystals are separated. Wet Epsomite crystals are dried in the drum dryer and are sent to storage. Dusty air coming from the process is treated in a scrubber before being released to atmosphere.
Kieserite
KIESERITE
The magnesium sulfate monohydrate, also named Kieserite, is the result of the reaction between magnesium oxide and sulfuric acid.
Magnesium oxide powder is mixed with water in a tank and transferred into an isothermal reactor in which sulfuric acid is added and react with magnesium oxide. The magnesium sulfate liquor is through the press filter. The filtered magnesium sulfate solution is being sent to the DTB crystallizer. The crystals slurry is discharged in a thickener (hydrocyclone or gravity settler) and the centrifuge (pusher type) and the Epsomite crystals (magnesium sulfate heptahydrate) are separated. Wet Epsomite crystals are dried in a specific drying system for an efficient water evaporation leading to a dehydration of crystals from Epsomite to Kieserite. Kieserite crystals are sent to storage. Dusty air coming from the process are treated in a scrubber before being released to the atmosphere.