DE624600C - Process for grinding and mixing cement clinker and raw gypsum - Google Patents

Description

When grinding cement clinker for cement production, the exact allocation is of the plaster of paris is of great importance in order to achieve the usual setting times. In the previously known cement mills the allocation of raw gypsum to the mill mostly by means of a special feeding device. When grinding cement clinker In mills with stream sifting, this method of working showed strong fluctuations in the setting time of the finished cement. The reason for this was that the raw plaster because of the mills sighted in the wind the prevailing low temperatures was not drained. It is then voi 'struck and also been tempted; ' current-sighted 'cement mills to heat using to heat your raw plaster of paris together with the clinker and to dry it by grinding to drain here.

However, the measure described above has major disadvantages. Giving up Raw gypsum together with, the clinker in the current-sighted mill / and application of the Mill drying for this mill is so unfavorable from a thermal point of view that it cannot be used in Question comes. You "have to" remove the small amount of red plaster in the clinker from about 2 to 30/0 to about 100 to 180 ° C heat up, too, the 97 to 980/0 clinker heat this temperature.

The invention described below avoids these disadvantages. The raw plaster will in a manner known per se in a special one Mill. With mill drying dehydrates and grinds, but is not only then stored, but rather blown into the circuit of the clinker mill together with the conveying air or sucked in. In this case, the dehydrated gypsum is introduced directly into the circuit of the grinding plant for clinker and mixed very intimately with the cement while in suspension. The invention allows also, by regulating the temperature in the gypsum mill during operation more or less dehydrating the plaster and thus influencing the setting time of the cement.

It is known that during the grinding process o the strength of cement. Like. ER- g leinzuführen in the mill where this has sufficient ER to vermählende Good due to the progressive grinding effect the degree of fineness of the introduced additives ₀ höhende dry aggregate at those locations.

The drawing gives a thematic representation of a system for carrying out the new process. The cement clinker is thrown from the container by means of the feed device g ₀ into the suction pipe of the clinker mill b, which is designed as a tube mill. The clinker mill is connected to the classifier c, the dust separator d and the fan e in a known manner. 6g

The raw plaster of paris is removed from the container h and fed into the suction line η of the plaster mill by means of a feed device

threw. Through these 'suction line "would" hot air or. Tieiße "Rajiijhgase from a heater or a furnace in k-stromgesichtete the gypsum mill * sucked. During the grinding process, the plaster of paris is dehydrated at the same time. It is then sucked out of the mill by means of the fan (s) and pressed into the feed pipe ο of the clinker mill. It then mixes intimately with the crude 1Ό clinker or the grits from the classifier c, which are thrown through the pipe socket q into the supply line ο. Since the clinker grinding plant works with negative pressure, and as a result, in addition to the hot gases coming from the gypsum mill, false air also enters the plant, this must be constantly vented. This is done by the fan, which mtaims the mentioned air or gas quantities through the dust filter jF and the line from the line 0 .

If the negative pressure in the IOinkermahi- - the system is large enough, there is no need for special fans in the gypsum grinding system will. The movement of the hot conveying gases through the gypsum mill is then carried out the negative pressure generated by the fan switched on in the clinker grinding plant

achieved. ■

The introduction of the ground and dried gypsum into the circuit of the KHmkennahlanlage can take place at any point of the conveying path between the pressure port of the mill fan e and the dust separator> ci. The introduction of gypsum in the dust collectors has proven to be very useful? A very good utilization of the clinker mill and a substantial relief of the gypsum mill can be achieved if the clinker mill is a very finely ground tube mill and the plaster mill is a coarser grinding mill, e.g. B. a hammer mill, a cross beater mill, a Sehleudermühle o. The gypsum ... then only gets its final fineness in the Klimkermühle.

Claims (3)

Claims :. 1. Process for grinding and mixing cement clinker and raw gypsum in. . sighted mills with grinding drying of the Gipisesi, characterized in that the ground and dehydrated plaster of paris the gypsum mill immediately without intermediate storage blown into the circuit of the cement mill with the hot conveying gases or is sucked in by the negative pressure prevailing in it. 2. The method according to claim 1, characterized in that the conveying gases The stream-controlled gypsum mill is fed directly into the KHnkermüble's dust collector will. 3. The method according to claim 1, characterized in that when using a tube mill as a cement clinker mill and a coarser grinding mill, e.g. B. one Hammer, cross beater, centrifugal mill o. The like. As a plaster mill, the plaster of paris with the conveying gases in the introduction line the clinker mill is introduced so that it only reaches its final fineness in the clinker mill receives / 1 sheet of drawings