Patent ID: 11938527
Assignee: AMATEQ HOLDING GMBH
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A process for the purification of waste materials or industrial by-products comprising chlorine (B), the process comprising the steps of:
a) preparing a composition (C) by blending or mixing waste materials or industrial by-products comprising chlorine (B) with one or more materials comprising heavy metals (HM);
b) reacting (B) and (HM) by thermal treatment of (C);
c) separating evaporated heavy metal chloride compounds (HMCC); and
d) obtaining a solid material after the thermal treatment step, wherein:
the heavy metals (HM) are one or more from the following set of elements: Zn, Pb, Hg, Cu, Cd, Tl, In, Sn, Ni, Co;
the thermal treatment is carried out at a temperature of 500-1200° C. and under a non-oxidizing atmosphere;
the materials comprising heavy metals (HM) and the waste materials or industrial by-products comprising chlorine (B) are mixed or blended in the presence of water, with 2-50% by mass of water being present in the composition (C); and:

a) a ratio of the materials comprising heavy metals (HM) to the waste materials or industrial by-products comprising chlorine (B) is chosen so that a chlorine content of the composition (C) is between 100 and 150% of an amount necessary for a stoichiometric conversion of the heavy metals (HM) in the materials comprising heavy metals (HM) into chlorides; or
b) the ratio of the materials comprising heavy metals (HM) to the waste materials or industrial by-products comprising chlorine (B) is chosen so that the chlorine content of the composition (C) is between 80 and 100% of the amount necessary for a stoichiometric conversion of the zinc in the materials comprising heavy metals (HM) into chlorides.