JP5327631B2 - Clinker dust control method - Google Patents

Description

The present invention relates to a method for dust suppression click linker, more specifically, emitting a cement material process of manufacturing cement from cement clinker is calcined product obtained upon firing kiln, especially in the process of transporting a clinker after baking The present invention relates to a clinker dust suppression method that effectively uses generated clinker dust to suppress clinker dust generation.

  As is well known, a clinker is a massive substance obtained when a cement raw material is fired in a kiln, and cement is produced by pulverizing the clinker. Such a clinker is baked in a rotary kiln and supplied to a silo through a cooling unit called an air quenching cooler (hereinafter referred to as AQC), and dust is generated in the process of supplying the silo. In particular, the amount of dust generated by AQC is large.

  Since such dust generation is not preferable in the work environment, it is collected by a dust collector. The dust collected in this way can be stored in, for example, a tank or a silo. However, a tank or silo for storage is required, and the cost for processing the dust increases. Therefore, in order to reduce such extra costs, it is also possible to return to the clinker manufacturing process and reuse it. As such a technique, for example, there is an invention according to Patent Document 1 below.

  As described in claim 1 of the patent document 1, the invention according to this patent document 1 uses “exhaust gas discharged from the upper part of the suspension preheater of the cement firing equipment for drying the cement material in the material crushing step. After separating the exhaust gas discharged from the raw material crushing process into purified exhaust gas and dust collection dust with a dust collector, the purified exhaust gas is released into the atmosphere, and the dust collection dust is sent to the upper part of the suspension preheater as part of the cement raw material. In the cement manufacturing process, a part of the dust collection dust is discharged from the circulation path of the cement clinker manufacturing process (A), and the dust collection dust discharged in the process (A) is introduced into the heating device and reduced. (B) step of heat treatment in the atmosphere, (C) step of rapidly cooling the dust-collected dust heat-treated in step (B), and rapid cooling in step (C) And (D) a process of returning the collected dust collected to the circulation path of the cement clinker manufacturing process and feeding it again as a cement raw material from the upper stage of the suspension preheater. Yes, in the step (D), the dust collection dust is returned to the circulation path of the cement clinker manufacturing process and reused.

  However, when the dust collected by the dust collection dust is returned to the clinker manufacturing process and reused, the dust again causes dust generation during the transportation of the clinker for cement production. The fired clinker is mixed with gypsum, etc., and pulverized for use in cement production, but is transported especially when the clinker firing place is different from the gypsum etc. When the clinker is loaded or when the transported clinker is unloaded, significant dust generation occurs.

JP 2009-184902 A

The present invention has been made to solve such problems, and it is possible to effectively use dust collected and collected from a clinker after firing, and to make such effective use possible. , it is reused, it is not name cause dust from the conventional such clinker, and to provide a method of dust suppression click linker.

In order to solve such a problem, the present invention adds a dusting inhibitor comprising an aliphatic polyhydric alcohol in an amount of 1 to 5% by weight based on the weight of clinker dust generated during clinker production. The present invention provides a method for suppressing clinker dust generation, which comprises adding clinker dust to a clinker to suppress clinker dust generation .

  As described above, the present invention provides a method for adding a dusting inhibitor comprising an aliphatic polyhydric alcohol in an amount of 1 to 5% by weight to the clinker dust with respect to the weight of the clinker dust generated during clinker production. Therefore, by adding the clinker dust to which such a dust suppressant is added to the clinker, the clinker dust as described in the above-mentioned conventional Patent Document 1 is simply returned to the clinker manufacturing process and reused. The clinker dust is not generated after reusing the clinker dust, and the clinker dust can be suitably suppressed as in the case where the clinker dust is not added to the clinker. became.

  In addition, since the clinker dust generation due to the reuse of the clinker dust can be suitably suppressed as described above, it has become possible to effectively use the clinker dust, which has been difficult in the past.

  Furthermore, since the generation of clinker dust can be suitably controlled, especially when the clinker firing place is different from the place of mixing and pulverization with gypsum, the clinker to be transported is loaded or transported. When the clinker is unloaded, there is no significant dust generation as in the past, and it is possible to improve the work environment by suppressing the clinker dust generation when unloading the transport destination where it is difficult to suppress dust generation. There is an effect.

  Furthermore, the dust generation inhibitor is not added to the entire clinker, but is added only to the clinker dust that causes dust generation, and it is added to the clinker. It is said that the dust generation inhibitor is not added to the portion of the clinker having a large particle diameter which is difficult to become, and the dust generation inhibitor is not consumed wastefully, so that the generation of dust can be efficiently controlled. effective.

  As described above, the present invention provides a clinker in which a dusting inhibitor comprising an aliphatic polyhydric alcohol in an amount of 1 to 5% by weight is added to the clinker dust with respect to the weight of the clinker dust generated during clinker production. This is an effective method of using dust.

  Examples of aliphatic polyhydric alcohols that are dust generation inhibitors include glycols such as diethylene glycol, ethylene glycol, and triethylene glycol, and glycerin. The carbon number of the aliphatic polyhydric alcohol is not particularly limited, but an aliphatic polyhydric alcohol having 3 to 20 carbon atoms can be preferably used.

  The addition amount of the dust generation inhibitor composed of aliphatic polyhydric alcohols is 1 to 5% by weight with respect to the clinker dust. When the amount exceeds 5% by weight, the clinker dust aggregates and generates dust in the cement. This is because the inhibitor is unevenly distributed and may adversely affect the hydration reaction of the cement. On the other hand, if it is less than 1% by weight, a sufficient clinker dusting suppression effect may not be obtained.

  As a means for adding the dust generation inhibitor to the clinker dust, for example, a means for adding the dust generation inhibitor to the clinker dust by dropping or spraying the dust generation inhibitor on the clinker dust can be employed.

  In addition, when adding the dust suppressant to the clinker dust, if the viscosity of the dust suppressor becomes an obstacle, it can be diluted with water, ethanol or methanol. Further, when the dust generation inhibitor is added to the clinker dust, the dust generation inhibitor can be suitably mixed into the clinker dust when stirred.

  Furthermore, the present invention is a clinker dust suppression method for suppressing clinker dust generation by adding the clinker dust to which the dust suppression agent has been added as described above to the clinker.

  The location and timing of adding the clinker dust to which the dust suppressant is added to the clinker are not particularly limited. For example, in the process of conveying the baked clinker by a conveyor or the like, it is possible to add clinker dust to which a dust generation inhibitor is added to the clinker.

  Furthermore, when handling the clinker at the manufacturing site when manufacturing cement, not only the clinker dust to which the dust generation inhibitor is added is added to the clinker, but also the clinker is transported to a place different from the firing place, Even when clinker is pulverized at the transport destination to produce cement, clinker dust to which a dust generation inhibitor is added can be added to the clinker to suppress dust generation.

  For example, the clinker firing place is different from the place of mixing and grinding with gypsum and the like. In addition, for example, when clinker is exported overseas and cement is produced at the export destination, dust generation inhibitor can be added to the clinker at the time of unloading at the export destination to suppress dust generation. The present invention has an actual advantage in that it can be applied to the clinker dusting suppression during the unloading.

  Examples of the present invention will be described below.

Example 1
After adding 3% by weight of diethylene glycol to the dust collected by the dust collector, 5% by weight of the dust to which the diethylene glycol was added was added to the clinker.

(Example 2)
After adding 3% by weight of diethylene glycol to the dust collected by the dust collector, 10% by weight of the dust added with the diethylene glycol was added to the clinker.

(Comparative Example 1)
Comparative Example 1 was prepared by adding 5% by weight of dust collection dust to which no dust suppressing agent such as diethylene glycol was added to the clinker.

(Comparative Example 2)
Comparative Example 2 was prepared by adding 10% by weight of dust collection dust to which no dust suppressant such as diethylene glycol was added to the clinker.

(Comparative Example 3)
A clinker to which dust collection dust was not added was prepared and used as Comparative Example 3.

(Test Example 1)
A dust generation test was performed using the samples of Example 1, Example 2, Comparative Example 1, Comparative Example 2, and Comparative Example 3. The test method is as follows. That is, 10 kg of clinker is placed in an empty ball mill and stirred for 1 minute. After stirring, the lid of the mill was opened, and the dust concentration was measured with a dust meter (Shibata Scientific Instrument Co., Ltd .: Digital dust meter P-5H2 type). The results are shown in Table 1.

  As is clear from Table 1, in Examples 1 and 2 in which diethylene glycol was added to dust collection dust, the dust concentrations were 450 CPM and 620 CPM, respectively, but a comparative example using dust collection dust to which no diethylene glycol was added. In 1 and Comparative Example 2, the dust concentration was very high, 1850 CPM and 2370 CPM. Therefore, it was found that by adding dust collection dust added with diethylene glycol to the clinker, dust generation is suppressed as compared with the case where dust collection dust without adding diethylene glycol is added to the clinker.

  In Comparative Example 3 in which dust collection dust is not added to the clinker, the dust concentration is naturally lower than that in Comparative Example 1 and Comparative Example 2. However, in Example 1 and Example 2, the dust concentration is inferior to that of Comparative Example 3. No result was obtained. In particular, the dust concentration in Example 1 was almost the same as that in Comparative Example 3.

Claims (1)

Clinker dust added with a dust suppressant composed of aliphatic polyhydric alcohols in an amount of 1 to 5% by weight based on the weight of clinker dust generated during clinker production is added to the clinker to generate clinker dust. A method for suppressing dust generation of a clinker, characterized by suppressing the dust .