METHOD FOR CONTROL OF BLEACHING PROCESS FOR TREATMENT OF WASTE PAPER AND BLEACHING DEVICE FOR REALISATION OF THIS METHOD Russian patent published in 2009 - IPC D21C9/10 

FIELD: textile fabrics, paper.

SUBSTANCE: invention is intended for application in pulp and paper industry. Method of bleaching process control for waste paper treatment is characterised by the following operations: preparation of fibrous suspension; measurement of fibrous suspension whiteness; mixing of fibrous suspension with bleaching substance; supply of mixed fibrous suspension to reservoir for bleaching; extraction of mixed fibrous suspension from reservoir for bleaching after certain time interval. Bleaching substance comprises mixture of separate substances, besides amount and/or composition of added bleaching substance is established depending on measured whiteness of fibrous suspension so that possible permanent specified whiteness of extracted fibrous suspension is achieved. Whiteness of extracted fibrous suspension is measured and compared in adaptation mode with specified whiteness, and depending on result of comparison compliance pattern is coordinated. Bleaching device contains reservoir for bleaching, supply pipeline with whiteness sensitive element, metering device, control device, discharge device.

EFFECT: prevention of large oscillations of fibrous suspension whiteness at the end of bleaching process, at that load of used bleaching substance is minimum.

7 cl, 2 dwg