JPS58104048A - Manufacture of granular slaked lime - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to the technical field of improving the granulation efficiency of slaked lime. Therefore, the present invention is applicable to the application of slaked lime for fertilizer, etc. from slaked lime powder industrially produced from quicklime etc. This invention relates to a method for producing suitable granular slaked lime, and in particular, the above-mentioned slaked lime powder is pre-caulked and humidified, quicklime powder is added and mixed therein, and then pressure molded and the molded product is subjected to reaction curing. This invention relates to a method for producing granular slaked lime in which the quicklime powder undergoes a water utilization reaction and its expansion force is used to disintegrate it.

As is well known, the methods for producing granular slaked lime used for spraying fertilizers, etc. have been the so-called wet method in which water is added to slaked lime powder, kneaded, extruded through a designated die and dried, and the slaked lime powder is A so-called dry method is employed in which the material is pressure-molded, crushed by a designated crusher, and then classified.

However, in the above-mentioned wet method in the United States, the particle size is particularly limited to 1
There is a drawback that it is difficult to improve the production efficiency when the drying process is lower than that, and there is also the disadvantage that the process is complicated because it requires a drying process.

This has the disadvantage of requiring a large amount of thermal energy for drying, resulting in high costs.

Furthermore, in the dry method, for example, when trying to obtain a product with a particle size of about 2 to 511 m, the recovery rate is less than 50 mm, resulting in a poor recovery yield.

In addition, due to the poor recovery rate, crushing and classification equipment with a volume more than twice the volume of the product is required, which also has the disadvantage of increasing costs. Many of them had a sharp, angular shape, and had the disadvantage of poor texture and fluidity.

The purpose of this invention is to solve the technical problem of the method for producing granular slaked lime based on the above-mentioned conventional technology, and to solve the problem by pre-caulking and humidifying slaked lime powder, adding and mixing quicklime powder to it, press-molding it, and curing it. We have solved the above-mentioned problems by taking technical measures to disintegrate the quicklime powder by utilizing its expansion force due to the water use reaction, and we have made it possible to efficiently manufacture high-quality products in a simple process. The purpose of this invention is to provide an excellent method for producing granular slaked lime that can be useful in the field of utilizing granular slaked lime in the quicklime industry.Next, one embodiment of the present invention is shown in Figs. Therefore, the explanation is as follows.

As shown in Figure 1, the raw material slaked lime powder 1 has a particle size of 5 to 15 μm.
Contains over 80% by weight.

Then, approximately 2 to 15 inches of water is added by weight to the slaked lime powder 1 and mixed to form a soft aggregate 2 coagulated by water as shown in FIG.

Next, as shown in FIG. 3, quicklime powder 3 having a particle size of about 1 to 3 m or less is added at a weight ratio of 5 to 20 to the slaked lime powder IK.
% and mix well.

When the above-mentioned mixture is quickly pressure-molded using a well-known briquette machine, pressure press, etc. at a pressure of, for example, 200 K9/cd or more, the material aggregate has fewer voids (as shown in Fig. 4). Therefore, the aggregate 2 becomes hard granular slaked lime 4.

Therefore, when the molded product obtained in this way is stored and cured, the quicklime powder 3 absorbs surrounding moisture and grows into granular slaked lime 4', and in the reaction process, about 2 Because the volume expansion is doubled, the molded product collapses into small pieces.

As a result, a granular material of a preferable particle size consisting of the granular slaked lime 4 and the granular slaked lime 4' is obtained, in which the quicklime powder 3 does not remain (and most of the water is contained). It is in a dry state because it is consumed in water use reactions.

It should be noted that the embodiments of the present invention are of course not limited to the above embodiments; for example, the amount of water added may vary.

Particle size and amount of quicklime powder added, pressure during pressure molding, etc.
However, by changing these conditions, the particle size and recovery rate of the granules can be varied.

Next, the experimental data conducted according to the above embodiment will be explained with reference to FIGS. 6 and 7.

Figure 6 shows the particle size distribution of granular slaked lime obtained when quicklime powder with a particle size of 0.149~Q, 5m/m was used and the amount added was changed. The cumulative transmittance T% is plotted on the axis, and the slaked lime particle size is plotted on the horizontal axis.
-x-x curve 1d5 weight ratio, --- curve represents 8% by weight, and -Δ--Δ- curve represents 9% by weight.

Figure 7 shows the particle size distribution of the obtained granular slaked lime when 10% by weight of slaked lime powder was added and the particle size was changed, and the vertical axis shows the cumulative transmittance T%. , the horizontal axis shows the slaked lime particle size -/-R1, in the figure, the curve of -...- is -0,149Ill/II, the curve of -x--x- is 0.149~Q, 5 m/y*1-Δ-Δ- song # is 0
．． 5~1.0 m/m, -o -o- curve is to~3
．． 07+1/, respectively.

Therefore, referring to the distribution state shown in Figure 6 and Figure 7 above, most of the obtained granular slaked lime has a particle size of 311JI or less, and moreover, it has a particle size of 100μ or less, which is the essential particle size of slaked lime powder. It is clear that the recovery rate is only 1° or less, which is an excellent recovery rate.

As described above, according to the present invention, slaked lime powder is pre-caulked and humidified, quicklime powder is added and mixed therein, and then pressure molded, and the molded product is reacted and cured, thereby increasing the water expansion power of the quicklime powder. Since it is used to disintegrate it, it has the excellent effect of omitting the crushing process.

In addition, since water is consumed by the water utilization reaction of the quicklime powder, the obtained granular slaked lime is in a dry state.
Another advantage is that the drying process can be omitted.

Furthermore, the particle size distribution of the above-mentioned granular slaked lime is mostly 3 mar or less, and the particle size distribution of the slaked lime powder is 100 μm.
Since the following substances have a molecular weight of 10'1 or less, they have an excellent effect of having an extremely high recovery rate.

In addition, since the granular slaked lime is obtained by disintegration, it is much more rounded than that obtained by crushing, and has superior properties in terms of texture and fluidity.
There is also the effect of

[Brief explanation of the drawing]

The drawings show examples of the present invention; Fig. 1 is an explanatory diagram of the state of slaked lime powder, Fig. 2 is an explanatory diagram of the state in which water is added and mixed, and Fig. 3 is an explanatory diagram of the state in which quicklime powder is added and mixed. Explanatory diagram, 4th. :,,The figure is an explanatory diagram of the state after pressure molding, Figure 5 is an explanatory diagram of the state of broken molded product 4'iM, and Figure 6 is the particle size of the obtained granular slaked lime when the amount of quicklime powder added is changed. Distribution diagram, FIG. 7 is a particle size distribution diagram of granular slaked lime obtained when the particle size of quicklime powder was changed. 4.4'... Granular slaked lime, 1... Slaked lime powder, 3
...Quicklime powder 1' Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 F2+ @6 Illustration ('A) Fig. 7 T

Claims (1)

[Claims] In a method for producing granular slaked lime from slaked lime powder, the slaked lime powder is humidified in advance, quicklime powder is added and mixed therein, and then pressure molded, and the molded product is reacted and cured to improve the water expansion capacity of the quicklime powder. A method for producing granular slaked lime characterized by disintegrating it using.