Abstract:
The present invention relates to a method and apparatus for feeding chemicals into a process liquid flow. The object of a preferred embodiment of the method and the apparatus of the present invention is feeding retention /chemical together with an additive, which may be another chemical or for example a mineral, to paper suspension flow to be fed to a paper machine. The method and the apparatus of the invention are particularly well applicable in feeding an additive of the paper manufacture, such as a filler, together with a retention chemical to paper pulp essentially simultaneously.
Abstract:
The present invention relates to a method and an arrangement for proportioning thick stock to a short circulation of a fiber web machine. Specifically, the method and the arrangement of the invention relate to treating and proportioning thick stock components of paper making stock having a consistency of the order of 2 -12 %, preferably 2 -5 %, for instance into white water one component after another alone or together with an additive.
Abstract:
The present invention relates to a method and apparatus for mixing various flows into a process liquid flow. The inventive method and apparatus are especially preferably suitable for introducing various chemicals into the pulp used in paper making.
Abstract:
The present invention relates to a method and an arrangement for proportioning thick stock to a short circulation of a fiber web machine. Specifically, the method and the arrangement of the invention relate to treating and proportioning thick stock components of paper making stock having a consistency of the order of 2 -12 %, preferably 2 -5 %, for instance into white water one component after another alone or together with an additive.
Abstract:
The present invention relates to a method and apparatus for feeding chemicals into a process liquid flow. The object of a preferred embodiment of the method and the apparatus of the present invention is feeding retention /chemical together with an additive, which may be another chemical or for example a mineral, to paper suspension flow to be fed to a paper machine. The method and the apparatus of the invention are particularly well applicable in feeding an additive of the paper manufacture, such as a filler, together with a retention chemical to paper pulp essentially simultaneously.
Abstract:
The present invention relates to a method and apparatus for in-line production of milk of lime into an in-line production process of PCC arranged in connection with a fibrous web machine. In the solution according to the invention the lime is slaked in a slaking apparatus (52) at a temperature of at least 80 degrees, preferably over 85 degrees, more preferably at over 100 degrees, the produced milk of lime is cleaned (58) by separating excessively large calcium hydroxide particles from it immediately prior to introducing (38) the milk of lime into the production process of PCC an the milk of lime is introduced into the in-line production process of PCC located in the production line of the end or intermediate product of the fibrous web machine (28).
Abstract:
The present invention relates to a method and a reactor for mixing one or more flows into a process liquid flow. Advantageously the method and reactor according to the invention are suitable for introducing such flows into a process liquid flow that either alone or together with a process flow tend to form organic or inorganic deposits onto the wall of the flow pipe. Especially preferably the invention is suitable for use when the chemicals of papermaking are introduced into the pulp.
Abstract:
The present invention relates to a method of and reactor for in-line production of calcium carbonate into a target suspension flow. The method and reactor according to the invention are suitable for introducing and mixing lime milk and carbon dioxide into a target suspension flow so that the calcium carbonate crystals formed during their reaction are not allowed to precipitate onto the walls (12) of the reactor (10), because the reactor is provided with means (16, 18, 20) for preventing the carbonate crystals from attaching to the surfaces of the structures located in the reaction zone.
Abstract:
The present invention relates to a method of and reactor for in-line production of calcium carbonate into a target suspension flow. The method and reactor according to the invention are suitable for introducing and mixing lime milk and carbon dioxide into a target suspension flow so that the calcium carbonate crystals formed during their reaction are not allowed to precipitate onto the walls (12) of the reactor (10), because the reactor is provided with means (16, 18, 20) for preventing the carbonate crystals from attaching to the surfaces of the structures located in the reaction zone.
Abstract:
The present invention relates to a method and a reactor for mixing one or more flows into a process liquid flow. Advantageously the method and reactor according to the invention are suitable for introducing such flows into a process liquid flow that either alone or together with a process flow tend to form organic or inorganic deposits onto the wall of the flow pipe. Especially preferably the invention is suitable for use when the chemicals of papermaking are introduced into the pulp.