The principle and equipment of waste paper flotation process are all derived from mineral flotation. With the development and needs of printing technology, besides deinking, flotation is also very important to effectively remove stickies and inorganic fillers in pulp. For flotation machines, efficient separation of fine particles (dp-5μm) and very large particles (dp-500μm) is necessary. On the basis of the original static mixed flotation machine, a series of high-pressure static mixed flotation machines such as PDM and Eco-cell were developed. More prominently, based on the results of research on mineral flotation absorption, significant progress has been made in the development of mechanical agitation and microporous gas flotation machines: Kvaener Hymac accepted the concept of flotation column in mineral flotation and applied it to Deinking flotation, developed in 1994 the successful deinking flotation column (Column Cell); Ahlstrom company absorbed Outokumpu (Outokumpu) flotation machine design ideas, developed Ahlstrom mechanical stirring deinking flotation machine, while It is also based on the principle of cyclone centrifugal field separation and has developed a gas-sparging cyclone (Gas Sparged Cyclone, GSC), so that the three types of deinking flotation machine also appeared in industrial practice.
As a technology source for de-inking and flotation, China's mineral flotation technology and its research and development are at the international advanced level: the world-famous mineral flotation problem - the flotation and enrichment of Baotou Baiyun Obo rare-earth-poor iron ore and Anshan Iron ore red floatation The election has been conquered by the Changsha Mining and Metallurgy Research Institute, among which the former was named one of the top ten scientific and technological achievements in the country in 1992. In the 90's, new cyclone flotation machines and flotation columns for the introduction of deinking flotation were used for flotation in China. In the field, it is a conventional flotation device; in terms of flotation chemicals, the "molecular design theory of flotation chemicals" pioneered by Academician Wang Yianzuo is at the leading international level. Therefore, scientific research workers in China's pulp and paper and mineral flotation industries should work closely together and rely fully on the solid foundation of mineral flotation research to apply advanced flotation scientific and technological achievements to waste paper deinking flotation to realize China's waste paper. The leap of deinking flotation technology.