Patent ID: 9746242
Date: 2017-08-29
CPC Classifications: C01B,F27B

Claim:
1. A rotary tube for a rotary tube furnace, configured for producing activated carbon, the rotary tube comprising a rotary tube body and a plurality of mixing sections comprising a plurality of mixing elements for mixing a feed material, wherein the rotary tube body and the mixing elements consist at least essentially of a quartz glass (fused silica); wherein the mixing elements are fastened on an inside of the rotary tube body and are firmly joined to the inside, wherein the mixing elements are firmly and permanently joined to the rotary tube body and the mixing elements comprise a plate-like configuration; wherein the rotary tube body comprises a middle axial section comprising a first internal cross section, two outer axial sections each comprising a second internal cross section and two transition sections each comprising a tapering third internal cross section; and wherein the rotary tube comprises a backflow protection or an overflow protection for solid or liquid materials on one or both of the outer axial sections, wherein the backflow protection or overflow protection is configured in such a way that the end adjacent to the respective transition section of one or both of the outer axial sections projects in the axial direction into the respective transition section.