By Gerald Ondrey |
Till now, waste tires have been used primarily for recovering power. Solely small proportions of the carbon black contained in these tires are recycled, because the mineral ash generated by pyrolysis consists of about 20 wt.% of components used to make the tires. A brand new course of developed by the Fraunhofer Institute for Constructing Physics (IBP; Valley, Germany; www.ibp.fraunhofer.de) is ready to isolate virtually all of this ash, permitting each the carbon black and the minerals from the ash to be reused. The method was developed on behalf of RCB Nanotechnologies GmbH (Munich, Germany; www.recovered-carbon-black.com).
To purify the carbon-black/ash combination created throughout the pyrolysis course of, a moist chemical technique is used. The (uncooked) carbon-black/ash combination, along with varied components and a liquid, are blended in a reactor, and brought by an outlined strain and temperature curve. The parameters and components are adjusted in such a method that just one specific mineral is selectively extracted from the combination at a time. This demineralization course of produces high-purity, recycled carbon black to be used in tires and different rubber merchandise, in addition to colorants (masterbatch) for plastic purposes, silicates, which can be utilized within the constructing supplies trade or for dyes, for instance, and likewise zinc salts for a broad vary of purposes.
A 200-L pilot plant will function for the following two years at Fraunhofer IBP, aiming to make recovered carbon black usable for different industrial purposes in addition to tires. The essential course of has already been patented, and RCB Nanotechnologies GmbH is the unique licensee. The corporate is presently engaged on scaling up the method and the manufacturing corridor is already constructed. The reactor quantity for one manufacturing line is predicted to be round 4,000 L, which is able to produce 400 kg/h of recycled carbon black from the ash, or 2,500 ton/yr. Within the ultimate enlargement stage, the plant could have a capability of 30,000 ton/yr.