The realization of wollastonite ore papermaking in Yunnan
Yunnan Province, where wollastonite is ground into superfine powder instead of plant pulp to realize ore papermaking, has produced thousands of tons of high-quality paper. At present, this major technological innovation has been extended to Shaanxi, Sichuan, Shandong and other places. More paper mills can replace part of the wood with ore when making paper.
Wollastonite is a natural chain like calcium metasilicate mineral, which can be divided into α crystal and β crystal, α crystal is usually granular and powdery; β crystal is usually fibrous and acicular, with a length diameter ratio of 20:1 and a maximum of 30:1.
β – crystalline fibrous wollastonite has the characteristics of high whiteness, high resistance, high aspect ratio, low oil absorption rate, low dielectric constant, heat resistance, corrosion resistance, acid and alkali resistance, non-toxic, non-magnetic, low coefficient of thermal expansion, small loss on ignition and excellent mechanical properties, and it has a affinity and force with plant fibers, so it can be used in newsprint, offset paper, writing paper, etc. in part instead of pulp fibers In the paper of printing culture, it not only saves raw materials but also has its unique advantages.
Wollastonite ultrafine powder is called “mineral fiber”. It is reported that using advanced ultrafine grinding technology, wollastonite can be crushed into fibers, which can be mixed with plant pulp for papermaking without changing the traditional process and equipment. Experts said that wollastonite paper can produce all kinds of paper, from ordinary packaging paper to advanced coated paper. These papers no longer have strong static electricity, moreover, the paper performance improvement, transparency enhancement.
Using wollastonite to make paper can also improve economic benefits. For each ton of wollastonite ultrafine powder used in papermaking, 3.6 cubic meters of wood can be saved; compared with wood pulp, each ton of wollastonite ultrafine powder can reduce the cost by 100-300 yuan.
Post time: Feb-10-2020