A METHOD AND A SYSTEM FOR PRECIPITATION OF CALCIUM CARBONATE AND A PRODUCT COMPRISING CALCIUM CARBONATE

The invention relates to a method for precipitating calcium carbonate， in which method calcium hydroxide is introduced to a fibre suspension containing cellulose-containing fibres， the calcium hydroxide is allowed to attach onto the surfaces of fibres for a pre-determined time， and the aqueous suspension of calcium hydroxide and fibres is brought into contact with carbon dioxide for precipitating the calcium carbonate. The invention also relates to a corresponding system for precipitating calcium carbonate in connection with cellulose- containing fibres. In addition， the invention relates to a fibrous product， which comprises pulp material produced by said method and comprising calcium carbonate. The invention relates to a method for precipitating calcium carbonate， in which method calcium hydroxide is introduced to a fibre suspension containing cellulose-containing fibres， the calcium hydroxide is allowed to attach onto the surfaces of fibres for a pre-determined time， and the aqueous suspension of calcium hydroxide and fibres is brought into contact with carbon dioxide for precipitating the calcium carbonate. The invention also relates to a corresponding system for precipitating calcium carbonate in connection with cellulose- containing fibres. In addition， the invention relates to a fibrous product， which comprises pulp material produced by said method and comprising calcium carbonate.