Welcome to White 'n' White Minerals Private Limited

We manufacture and supply Quick Lime used in sulfite-pulping process at paper mills. This process uses acid to dissolve the glue that holds the fibers (cellulose) together. When acidic water discharged from this process is neutralized, Quick Lime is used as reagent to elevate the pH of the effluent stream prior to discharge. Quick Lime is also used in Kraft-pulping process. This process uses caustic soda (NaOH), among other chemicals, to dissolve the glue. Paper mills have two internal loops in their system working together to generate caustic soda. The first involves the caustic soda itself. Freshly made caustic soda is pumped to large chambers where it is mixed with wood chips under heat and pressure. The caustic soda attacks the glue and, in the process, is converted to sodium carbonate (Na2CO3). This sodium carbonate is then pumped to a large vessel that holds slaked lime (Ca(OH)2). The two react to form caustic soda and calcium carbonate (CaCO3). The caustic soda is pumped off to once again mix with the wood chips, and the calcium carbonate is conveyed to a kiln where it is heated to convert it to lime (calcium oxide or CaO). This lime is then mixed with water, forming slaked lime, and the sodium carbonate returning from the pulping process is mixed with it forming caustic soda; and the process is started all over again.

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