Abstract: An example method for operating a plant, which has at least one assembly with a rotating surface that wears to an increasing extent during the operation of the plant, may involve evaluating a wear state of the rotating surface of the assembly. Based on the wear state of the rotating surface, a manner in which the plant is operated may be modified to prolong the running time of the assembly until, for instance, a next-scheduled service or maintenance interval. The modified manner of operating the plant may be adapted to the wear state of the rotating surface. Several examples of such modifications include changing a quantity of water sprayed onto material to be comminuted, changing a quantity of grinding additive added to material to be comminuted, and/or changing a contact pressure of a grinding roll of the assembly.

Abstract: An example method for operating a plant, which has at least one assembly with a rotating surface that wears to an increasing extent during the operation of the plant, may involve evaluating a wear state of the rotating surface of the assembly. Based on the wear state of the rotating surface, a manner in which the plant is operated may be modified to prolong the running time of the assembly until, for instance, a next-scheduled service or maintenance interval. The modified manner of operating the plant may be adapted to the wear state of the rotating surface. Several examples of such modifications include changing a quantity of water sprayed onto material to be comminuted, changing a quantity of grinding additive added to material to be comminuted, and/or changing a contact pressure of a grinding roll of the assembly.

Abstract: A method and system for processing ore-containing material is provided. The material is comminuted in at least one first mill. The comminuted material is classified in a first classification into coarse and fine material. At least part of the coarse material of the first classification is returned back to the first mill. The fine material of the first classification is classified in a second classification again into coarse and fine material. The coarse material of the first classification is subjected to a first sorting into a first valuable and a first less valuable fraction. The first valuable fraction is returned to the first mill and the less valuable fraction is discarded.

Abstract: In the method according to the invention for increasing the calorific value of a material flow containing carbon, preferably a material flow of renewable raw materials, the material flow is brought in direct contact with at least one low-oxygen, inert hot gas flow in a reactor, wherein the hot gas flow is formed at least 50%, preferably at least 80%, by exhaust gas of a process for thermally processing cement raw meal and/or lime and/or an ore, wherein at least part of a preheater exhaust gas for preheating the cement raw meal and/or lime and/or ore is used as the hot gas flow.

Abstract: A device for drying and torrefaction of at least one carbon-containing material flow in a multiple-hearth furnace includes a drying zone, a torrefaction zone, a heat exchanger for heating the drying gas flow, the discharge point of the drying zone being connected via the heat exchanger to the infeed point of the drying zone; and a combustion assembly, wherein the discharge point of the torrefaction zone is connected via the combustion assembly and the heat exchanger to the infeed point of the torrefaction zone, wherein a torrefaction gas flow discharged via the discharge point of the torrefaction zone is combusted in the combustion assembly and the resulting exhaust gas is used in the heat exchanger to heat the drying gas flow and is fed to the torrefaction zone, wherein the drying zone and the torrefaction zone comprise two separate gas circulations.

Abstract: The device according to the invention for drying and torrefaction of at least one carbon-containing material flow in a multiple-hearth furnace substantially comprises a drying zone, which comprises a feed device for feeding a carbon-containing material flow, a discharge point for discharging a drying gas flow containing water vapour and an infeed point for recycling at least a part of the drying gas flow, a torrefaction zone for degassing the material flow dried in the drying zone, which comprises a discharge point for discharging a torrefied material flow, at least one infeed point for an exhaust gas and a discharge point for a torrefaction gas flow, a heat exchanger for heating the drying gas flow, the discharge point of the drying zone being connected via the heat exchanger to the infeed point of the drying zone, a combustion assembly, wherein the discharge point of the torrefaction zone is connected via the combustion assembly and the heat exchanger to the infeed point of the torrefaction zone, wherei

Abstract: Apparatus and method for the production of cement clinker, wherein raw meal is preheated in a heat exchanger and is burnt in a kiln to form cement clinker and the exhaust gases from the kiln flow in succession through the heat exchanger and a catalytic converter, wherein the exhaust gases are analysed before and/or after the catalytic converter arid the preheated raw meal is precalcined in a calciner. Moreover, for the subsequent catalytic exhaust gas purification the provision of a calciner has the advantage that higher exhaust gas temperatures are produced so that a throughput is produced. As a result the required volume of the catalytic converter is reduced and the investment costs are lowered.

Abstract: Apparatus and method for the production of cement clinker, wherein raw meal is preheated in a heat exchanger and is burnt in a kiln to form cement clinker and the exhaust gases from the kiln flow in succession through the heat exchanger and a catalytic converter, wherein the exhaust gases are analysed before and/or after the catalytic converter arid the preheated raw meal is precalcined in a calciner. Moreover, for the subsequent catalytic exhaust gas purification the provision of a calciner has the advantage that higher exhaust gas temperatures are produced so that a throughput is produced. As a result the required volume of the catalytic converter is reduced and the investment costs are lowered.