US 6,264,738 B1Granted

Method of producing cement clinker and associated device

AssigneesPaul Lorke, Alexander Lorke

InventorsPaul Lörke, Alexander Lörke

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Abstract

Portland cement has hitherto been produced from finely ground raw meal with a residue on the 80 micron sieve of 10-20%, corresponding to a grain size ratio of 0.01-80 micron grains to 80.01-500 micron grains in the raw meal of 9:1 to 4:1. With the novel process, it should be possible to use coarse-ground raw meal. The process involves roasting the raw meal in which the grain size ratio in the basic raw meal components of the 0.01-80 micron grains to the 80.01-2000 micron grains is 1.5:1 to 1:9. The acidic raw meal components with a melting temperature of no higher than 1,300 C. are ground to the same grain size ratio. Also described are devices and processes for grinding and roasting raw meal. The advantages of the invention are reduced energy consumption during grinding of the raw meal, improved throughput of material through ovens and mills and improved cement characteristics.

Claims11

Dependent claims

A method of producing cement clinker from basic and acidic raw material components including:

a. grinding and drying said raw material components,
b. mixing the raw material components,
c. preheating, calcining, and sintering said raw material components in stages to produce cement clinker, and
d. cooling said cement clinker,
the improvement comprising:
e. grinding the basic raw material components to form a fine grain fraction having a grain size of 0.01 to 80 μm and a coarse grain fraction having a grain size of 80.01 to 2000 μm with a grain size ratio of the fine grain fraction to the coarse grain fraction of 1.5:1 to 1:9;
and
f. heat treating the acidic raw material components having a grain size below 80 μm in a mixture with the fine grain fraction of said basic raw material components, wherein the proportion of the raw material components fine grain fraction relative to said acidic raw material components is in a range which in the sintering stage is sufficient only for the formation of CS and/or C3S2 and C2AS, C3A, C12A7 and C4FA.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/029,017Filed 16 Feb 1998
Priority: DE 195 40 9963 Nov 1995
Granted: 24 Jul 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

C04B 7/43
Manufacture of hydraulic cements in general: heat treatment, e.g. precalcining, burning, melting; Cooling
C04B 7/38
Manufacture of hydraulic cements in general: preparing or treating the raw materials individually or as batches , e.g. mixing with fuel
Y02P 40/121
Production of cement, e.g. improving or optimising the production methods; Cement grinding: energy efficiency measures, e.g. improving or…
C04B
Lime, magnesia