JPH09169551A - Production of reaction retarding quick lime - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of a quick lime having uniform reaction retarding function. SOLUTION: A powdery reaction retarding quick lime is produced by adding a surfactant or an oil and fat to a quick lime coarsely pulverized into a specified particle size at a temp. higher than the liquefaction temp. and lower than the vaporization temp. of the surfactant and finely pulverizing the surfactant or quick lime added with fat and oil. And a granular reaction retarding quick lime is produced by adding a liquid surfactant or the raw quick lime added with fat and oil at a specified temp. and coarsely pulverizing the surfactant or the fat and oil added-quick lime.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a useful method for detoxifying waste substances such as used oil and producing more effective substances in the process of detoxifying.

[0002]

2. Description of the Related Art The use of hydrophilic substances such as surfactants and oily substances, especially hydrophilic or hydrophobic substances such as polymer substances, is increasing more and more, but these used oil substances are carelessly discarded. In some cases, it may cause environmental pollution.
Caution must be taken. On the other hand, quick lime has an extremely active reaction with water, but its application is sometimes limited because it is too active, and attempts have been made to suppress the reaction rate of quick lime with water. For example, the addition of the above-mentioned surfactants or fats and oils to quicklime in order to produce reaction-delayed quicklime is one example.

[0003]

In the production of the reaction-retarding quicklime as described above, the conventional method was to simply add a surfactant to the raw quicklime and grind it. However, quicklime thus obtained was obtained. There were many variations in terms of reaction delay, and they were not managed sufficiently for profit or actual use. This is because the powdery or granular quicklime was not managed to be coated with a necessary and sufficient surfactant or oil. The present invention has been made to solve the problems in the conventional method for producing a reaction-retarding quick lime, and provides a rational production method for powdery and granular reaction-retarding quick lime.

[0004]

In order to achieve the above object, a method for producing powdery reaction-retarding quicklime according to the present invention comprises:
Surfactants or fats and oils are added to the quick lime coarsely crushed to a predetermined particle size at a temperature not lower than the liquefaction temperature of the surfactant and not higher than the evaporation temperature, and the quick lime to which the surfactants or fats and oils are added is finely crushed. It is configured as a method for producing powdery reaction-retarding quick lime by producing powdery reaction-retarding quicklime. The surfactant or oil and fat may be composed of powdery stearic acid, and in this case, the addition temperature of the powdery stearic acid is preferably 80 ° C. or higher and 90 ° C. or lower. The addition amount of the liquid stearic acid is preferably 1% by weight or more, more preferably about 1% by weight, based on the raw quicklime. The residence time of the quicklime added with stearic acid in the fine pulverizer is preferably about 30 seconds. In addition, the method for producing the quick-lime granular reaction retardant according to the present invention comprises adding liquid surfactant or fat and oil to the raw quicklime at a predetermined temperature, and then roughly crushing the quicklime added with the surfactant or fat and oil. The method is for producing a powdery reaction-retarding quick lime for producing granular reaction-retarding quick lime. When the surfactant or oil and fat is composed of liquid stearic acid, the addition temperature of the liquid stearic acid is preferably 60 ° C. or higher and 80 ° C. or lower. It is desirable that the addition amount of the liquid stearic acid is 1% by weight or more with respect to the raw quicklime. The desirable residence time in the coarse crusher of the quicklime added with the stearic acid is about 30 seconds. Further, the surfactant or the oil or fat may be composed of liquid oleic acid, and in this case, the desirable addition temperature of the liquid oleic acid is 60 °.
It is C or higher and lower than 80 ° C. It is desirable that the amount of the liquid oleic acid added be 1% by weight or more based on the raw lime. The above-mentioned surfactant or fat may be composed of liquid soybean fatty acid. In this case, the addition temperature of the above-mentioned liquid soybean fatty acid is 60 ° C or more and 80 ° C or less, and the addition amount is 1% by weight or more based on the raw quicklime. Can be

[0005]

[Hydration test method]

1. Scope of application Know the reactivity by titrating the OH elution rate of quicklime with 4N-hydrochloric acid. 2. Approximately 20 kg of massive lime is 10 mm with a jaw crusher
After sieving through a sieve (JIS Z 8801-1966) all the way through, 2000μ sieve (JIS Z8801-
1966). The residue is repeatedly reduced using a reducer, and 100 g is sampled and used as a measurement sample. 3. Reagent (1) Phenolphthalein solution (0.2W / 1V
%, Ethyl alcohol solution) (2) 4N-hydrochloric acid (f = 1) Titration is performed by using sodium carbonate standard reagent with bromphenol blue as an indicator and titration with hydrochloric acid. 4. Operation method (1) Weigh 25 g of the sample with an upper balance. (2) Put pure water in a 500 ml beaker, and
Heat to 2 ° C with a heater. (3) Fill a 200 ml buret with 4N HCl. (4) The graduated cylinder (500 ml) of pure water from (2)
Take 500 ml, put in a 2000 ml poly jug, add a small amount of phenolphthalein indicator, and start stirring with a stirrer. (Adjust water temperature to 30 ° C) (5) Put the sample collected in (1) into the plastic jug (4) and start the stopwatch at the same time. (6) Add 4N HCl of (3) dropwise while paying attention to the red color of the solution of (5). Maintaining the operation of (6) and consuming 4N · H in 10 minutes
Determine the amount of Cl (ml). 5. Calculation formula Hydration = 4N HCl consumption (ml) x 4N HCl
Factor 6. Quick lime titrator The device of FIG. 8 is used. A: 200 ml and 500 ml burette B: 2 l polyjockey C: Stirrer, 3-blade propeller diameter 60 mm, width 10 m
m, blade inclination 45 degrees, propeller shaft speed 350 rpm D ... Stopwatch

[0006]

EXAMPLES The results of the hydration test in the case of granular reaction-retarding quicklime using liquid oleic acid instead of liquid stearic acid are shown in FIGS. Like liquid stearic acid, the preferred addition temperature of liquid oleic acid is 60-80 ° C.
The addition amount is 1% by weight or more (preferably 1 to 3%, particularly preferably about 1%) with respect to the raw quicklime. Also in this case, it is desirable that the material be retained between the coarse pulverizer and the sieve classifier for a time of about 30 seconds and sufficiently diffused. Fig. 5 shows a particle size of 0.5 to 1.0 mm, and Fig. 6 shows a particle size of 0.25 to 0.5.
In the case of mm, FIG. 7 shows the case of 0 to 0.25 mm. From the figure, it is understood that in the case of oleic acid, the coarser the particle size, the longer the delay time. Like oleic acid,
Soybean fatty acids can be used as vegetable oils. The addition conditions in this case are the same as those for oleic acid.

[0007]

Industrial Applicability The method for producing powdery reaction-retarding quicklime according to the present invention comprises a step of adding a surfactant or a fat or oil to quicklime roughly crushed to a predetermined particle size at a temperature not lower than the liquefaction temperature and not higher than the evaporation temperature of the surfactant. It is a method for producing powdery reaction-retarding quicklime by finely pulverizing the quicklime added with the above surfactants or fats and oils, which may adversely affect the environment. Waste oil, which has a certain property, is fixed in quicklime and delays the reaction rate of quicklime to create quicklime, which is more useful than conventional quicklime. In this case, since the surfactant, oil and fat are evenly dispersed in the quick lime, quick lime having a constant reaction delay can be obtained. Powdered stearic acid is used as the surface active agent or oil and fat, and the addition temperature of the powdered stearic acid is set to 80 ° C. or more and 90 ° C. or less, whereby excellent quick lime is obtained in terms of economy and uniformity of reaction delaying property. Obtainable. By setting the addition amount of the powdery stearic acid to 1% by weight or more, preferably 1% to 3% with respect to the raw lime, the minimum necessary adhesion of the surfactant and the fat and oil to the quick lime is achieved. In this case, the addition of about 1% by weight becomes excellent in economic efficiency. By setting the residence time of the quicklime added with the stearic acid in the fine pulverizer to about 30 seconds, the uniformity of the diffusion of stearic acid is improved. The above-mentioned surfactant or fat may be composed of powdery oleic acid. In this case, the addition temperature is 60 ° C or higher and 80 °
When it is C or less, uniform addition becomes possible. When the amount of the powdery oleic acid added is 1% by weight or more based on the raw lime, the uniformity of diffusion of the added oleic acid is improved. In the production of quick-lime granular reaction retardant,
After adding a liquid surfactant or fats and oils to the raw quicklime at a predetermined temperature, the quicklime added with the above surfactants or fats is roughly crushed to produce granular reaction-retarding quicklime. A method is provided. This gives
A granular reaction-retarding quicklime that always achieves a certain delay is obtained. The surfactant or the oil or fat is liquid stearic acid, and the addition temperature of the liquid stearic acid is 60 ° C. or higher and 80 ° C. or lower, whereby uniform adhesion of the surfactant or the oil or fat is achieved. By setting the addition amount of the liquid stearic acid to 1% by weight or more with respect to the raw quicklime, the minimum required amount of stearic acid can be attached. Uniform diffusing of the stearic acid is achieved by setting the residence time of the quicklime added with the stearic acid in the coarse crusher to about 30 seconds. The above-mentioned surfactant or fat may be composed of powdery oleic acid. In this case, the addition temperature is
By setting the temperature to 60 ° C or higher and 80 ° C or lower, uniform addition becomes possible. When the amount of the powdery oleic acid added is 1% by weight or more based on the raw lime, the uniformity of diffusion of the added oleic acid is improved. It is also possible that the surfactant or fat is composed of soybean fatty acid.
The addition conditions in this case are the same as those for liquid oleic acid.

[Brief description of the drawings]

FIG. 1 is a process drawing showing a process for producing powdery reaction-retarding quicklime according to an embodiment of the present invention.

FIG. 2 is a process drawing showing a process for producing granular reaction-retarding quicklime according to an embodiment of the present invention.

FIG. 3 is a graph showing a hydration time of granular quicklime produced by the method for producing powdery reaction-retarding quicklime according to an embodiment of the present invention.

FIG. 4 is a graph showing the hydration time of granular quicklime produced by the method for producing quick-lime granular reaction retardation according to an embodiment of the present invention.

FIG. 5 is a graph showing the hydration time of quicklime added with oleic acid (0.5 to 1%).

FIG. 6 is a graph showing the hydration time of quicklime added with oleic acid (0.25 to 0.5%).

FIG. 7 is a graph showing the hydration time of quicklime added with oleic acid (0 to 0.25%).

FIG. 8 is a diagram showing an outline of a quicklime titrator.

[Explanation of symbols]

A: 200 ml and 500 ml burette B: 2 l polyjockey C: Stirrer, 3-blade propeller diameter 60 mm, width 10 m
m, blade inclination 45 degrees, propeller shaft speed 350 rpm D ... Stopwatch

Claims (13)

[Claims] 1. A quick lime coarsely crushed to a predetermined particle size is added with a surfactant or fat at a temperature not lower than the liquefaction temperature and not higher than the evaporation temperature of the surfactant, and the surfactant or fat is added. A method for producing powdery reaction-retarding quicklime, which comprises finely pulverizing quicklime to produce powdery reaction-retarding quicklime. 2. The surfactant or fat is powdery stearic acid, and the addition temperature of the powdery stearic acid is 8
The method for producing powdery reaction-retarding quicklime according to claim 1, which is 0 ° C or higher and 90 ° C or lower. 3. The method for producing powdery reaction-retarding quicklime according to claim 2, wherein the addition amount of the powdery stearic acid is 1% by weight or more based on the raw quicklime. 4. The method for producing powdery reaction-retarding quicklime according to claim 2, wherein the amount of the powdery stearic acid added is about 1% by weight based on the raw quicklime. 5. The method for producing powdery reaction-retarding quicklime according to claim 1, wherein the quicklime added with stearic acid has a residence time in a fine pulverizer of about 30 seconds. 6. A granular reaction for producing granular reaction-retarding quick lime by adding liquid surfactant or fat and oil to raw material quick lime at a predetermined temperature and then coarsely crushing the quick lime added with the surfactant or fat and oil. Method for producing delayed quicklime. 7. The surfactant or fat is liquid stearic acid, and the addition temperature of the liquid stearic acid is 60.
The method for producing granular reaction-retarding quicklime according to claim 6, wherein the temperature is from 80 ° C to 80 ° C. 8. The method for producing granular reaction-retarding quicklime according to claim 6, wherein the surfactant or oil and fat is liquid oleic acid, and the addition temperature of the liquid oleic acid is 60 ° C. or higher and 80 ° C. or lower. 9. The method for producing granular reaction-retarding quicklime according to claim 7, wherein the amount of the liquid stearic acid added is 1% by weight or more with respect to the raw quicklime. 10. The method for producing granular reaction-retarding quicklime according to claim 8, wherein the addition amount of the liquid oleic acid is 1% by weight or more with respect to the raw quicklime. 11. The method for producing granular reaction-retarding quicklime according to claim 6, wherein the residence time of the quicklime added with stearic acid in the coarse crusher is about 30 seconds. 12. The method for producing granular reaction-retarding quicklime according to claim 6, wherein the residence time of the quicklime added with oleic acid in the coarse pulverizer is about 30 seconds. 13. The surfactant or oil and fat is a liquid soybean fatty acid, and the addition temperature of the liquid soybean fatty acid is 6
The method for producing granular reaction-retarding quicklime according to claim 6, which is 0 ° C or higher and 80 ° C or lower, and the addition amount is 1% by weight or more based on the raw quicklime.