Italcementi

Giovanni Cinti

Roberto Fedi

Antonio Clausi

It is described an integrated process for the production of clinker by dry process, with treatment in continuous of by-pass dusts produced by the kiln, wherein the solid matter to treat consists of bypass dusts of a clinker production process, containing compounds of chloride, sodium, potassium and sulphur, such a process comprising the following steps: a) extraction of the bypass dusts directly from the phase of quench, without intermediate storage, at a temperature comprised between 150 and 200&#xb0; C., with a moisture content varying from 0.1 to 3% by weight, preferably from 0.1 to 0.5% by weight, and with a quantity of calcium carbonate lower than 55% by weight; b) mixing of said dusts coming from step a), within a maximum time comprised between 2 and 10 minutes, preferably lower than about 5 minutes, with water up to a water/dusts ratio varying from 2:1 to 4:1, preferably from 2.5:1 to 3.5:1, in a way to obtain a mixture with a moisture content comprised between 45 and 75% by weight, preferably between 50% and 55% by weight, even more preferably equal to about 50% by weight; c) mechanical stirring of the mixture diluted up to complete dissolution of the soluble salts; d) mechanical separation of the mixture so diluted in a liquid fraction containing water and soluble salts and in a solid fraction in form of cake or crust.

Integrated process for the production of clinker with treatment of bypass dusts produced by the kiln

The present invention concerns a process for purifying a flow of combustion fumes from a clinker production plant comprising the following operating steps: a) removing dust at a temperature comprised between 250 and 400&#xb0; C. from a flow of combustion fumes exiting from a suspension preheater with formation of a flow of combustion fumes free of dust; b) carrying out on said flow of combustion fumes free of dust a selective catalytic NOreduction treatment with a reducing agent, with formation of a purified flow of combustion fumes. The present invention also concerns an apparatus for carrying out the aforementioned process.

Process for purifying a flow of combustion fumes from a clinker production plant and relative apparatus

The present invention concerns an apparatus for the production of clinker from raw meal, comprising: a rotary kiln (), optionally a precalciner; a multi-stage cyclone preheater () connected downstream of said rotary kiln () with respect to the direction of flow of the fumes () of a combustion taking place in said kiln (); an electrofilter () connected downstream of said preheater () with respect to said direction of flow of the combustion fumes (); characterized in that it comprises a first inlet () for feeding raw meal to said combustion fumes (), said inlet () being arranged downstream of said preheater () and upstream of said electrofilter () with respect to said direction of flow of the combustion fumes (), and in that it comprises a second inlet () for feeding partially preheated raw meal () from said electrofilter () to said preheater (). The present invention also concerns an improved process for the production of clinker from raw meal.

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Bergamo BG, Italy

Giovanni Cinti