Gases the easy way – Messer provides solutions - Strategic application technology
Green liquor is formed by dissolving the melt from the liquor recovery boiler; it is converted into white liquor in the causticizing plant and used again for fibre pulping. Oxygen can be used advantageously in the lime kiln.
revised_Customer process causticizing in the Pulp & Paper sector
Causticizing rotary furnace
When the thick liquor is burned under limited air intake, a melt of sodium carbonate (Na2CO3) and sodium sulphide (Na2S) is formed. Dissolving this in water gives "green liquor". The sodium carbonate is causticized with calcium hydroxide (slaked lime, Ca(OH)2) to sodium hydroxide solution. Filtration produces "white liquor" which is re-used in the process. The filtered calcium carbonate is burned in a rotary drum furnace to calcium oxide (burnt lime, CaO).
revised_Application technology causticizing in the Pulp & Paper sector
Causticizing with gas
Improving incineration on causticizing rotary furnace