DE1646902A1 - Process for the production of moldings from cement raw material - Google Patents

Description

P 608

G.BuKlU ₇ Beubeekum

Process for the production of moldings from cement; raw material

The invention relates to a method for Manufacture of moldings from cement raw material, in particular of insufficient. Flastiaity, which is subsequently a Be subjected to heat treatment.

Pur di · Preparation of raw cement material and the Subsequent production of briquettes "from" the processed material and essentially two processes are known, both of which, however, have certain disadvantages are: |

In the so-called healing process, the cement raw material is processed in the naeeeaa state and the resulting sludge is first fed to a filter press, in which a mechanical dewatering is carried out. Tone yilrs ^ iiti frb ^ i ¹

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is due to the considerable investment expenditure as well as in the also considerable energy requirements of the filter press. Another disadvantage is the relatively high heat requirement, which is calibrated when the briquettes are fired still gives a fairly high moisture content.

In the so-called dry process, on the other hand, the processing of the raw cement material takes place in the dry state. The processed, powdery cement raw material is then processed in a granulating device with the addition of 11 to 14 percent by weight liquid granules are formed, which are then used for production heat treatment required by cement clinker.

This dry process avoids the investment required by the filter press in the wet process. The dry process is also distinguished in In view of the lower moisture content of the granules, there is less heat consumption during firing of the granules.

On the other hand, however, this known trooken procedure is subject to a significant part of the facts, the calibration

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- 3 marls) shows.

In such a raw material, the known dry process namely provides moldings van very low porosity which easily during firing _s platsen so that yields on the traveling grate, which is commonly used for preheating of the briquettes a too diehtee bed of material with low Gasdurchläsaigkeit. This low porosity of the granules produced in the dry process is based - as extensive tests by the applicant have shown - when using less plastic raw material in part on this material structure. However, more importantly, ⁿ is the "Schmiedeirirkun £ experienced by the Formlinge.beim granulation by dae continuous circulation, In this (rrsnulierTdrgang the outer Sehale of the moldings will largely compacted" The reduction of Gasdurchläeeigkeit the outer granules Pushes characterized entering results in the in the experiments the Aßmei & srin frequently found seJialenföralgen platBen the Chranalia during the heat treatment *

35er invention is therefore di "Aufgab® sugKiM © _s a new procedure PMS E © ret®U" ng tos. Fozsaling ^ s. sis »Scaientirohaaterial to create the Bfewotel ü ± e Haektslle de · Trockeararfahreni ?, as well as that of the laiwrfak ^ e & s trsraeidet,

109835/1197

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According to the invention, this object is achieved by that the dry prepared cement raw material is moistened with 10 to 20 weight percent liquid and then further processed in a press au Würetchen-like shapes.

The inventive method is thus based on a dry preparation of the cement raw material and thus reports the specific disadvantages * associated with the known wet processes are connected. So it is not applicable especially the high investment and energy costs for a filter press.

In contrast to the previously known dry process, on the other hand, the solution according to the invention the dry processed cement raw material is not granulated, i.e. shaped into spherical shapes by circulation in a rotating granulating device, but After being moistened in a press, it is processed into sausage ax-shaped shapes Process according to the invention dit avoided undesirable forging effect and compression of the outer shell of the moldings. Rather, the sausage-like moldings produced by the method according to the invention are ice-cream high porosity, so that the undesired flattening of the moldings during the heat treatment and the resulting

109835/1197

BATH

called compaction of the formed by the formations Bed on the traveling grate are excluded. These The fact and the fairly uniform grain size of the briquettes lead to the process according to the invention a much better gas permeability of the material bed on the traveling grate, which increases the heat demand compared to the previously known dry process by about (|

5o kcal / kg clinker can be lowered.

The dry processed cement raw material is used in The method according to the invention is only moistened to the extent necessary for the desired quality of the molding. Depending on the type of cement raw material in question, the Amount of liquid used to moisten the dry raw material between 10 and 20 percent by weight.

Since the energy requirement of the press used to produce the Würatohen-like briquettes depends very much on the Moisture of the dry raw material is closely dependent on the liquid used, the desired degree of humidity of the molding can be adjusted very conveniently as a function of the Regulate the performance of the press. That way results suglftloh a protection against overloading the sausages l · ·! unforeseen occurrence of a particularly dry;

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Claims (2)

16 4 6 "9 O claims 1.) Process for the production of moldings from cement raw material, in particular of insufficient plasticity, which are then subjected to a heat treatment, characterized in that the dry processed cement raw material with Io to 2o Weight percent liquid is moistened and then further processed in a press to form sausage-like shapes. 2.) The method according to claim 1, characterized in that the amount of liquid used for moistening is regulated depending on the power consumption of the press. i V
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