北美大多数利用回收废纸生产新闻用纸的工厂使用碱性浮选脱墨方法。脱墨时在碎浆机中加入的化学品主要有苛性物质(NaOH),过氧化物(过氧化氢)、硅酸盐(硅酸钠)等。苛性物质有助于将油墨和纤维分开,但是容易引起机械纤维泛黄。过氧化物能够抵消这种泛黄的变化。硅酸盐有助于稳定过氧化物和阻止油墨的重 Most plants in North America that make use of recovered paper to produce newsprint use alkaline flotation deinking. Deinking in the pulper when adding chemicals mainly caustic (NaOH), peroxide (hydrogen peroxide), silicate (sodium silicate) and so on. Caustic helps to separate the ink from the fibers, but easily causes the mechanical fibers to yellow. Peroxides counteract this yellowing. Silicates help to stabilize the peroxide and prevent the weight of the ink