JPS58162687A - Crushing agent for brittle material - Google Patents

Abstract

PURPOSE:A crushing agent for crushing a brittle material such as stones and rocks, concrete, bricks, etc. without using a kind of gunpowder, comprising mixed powder of quicklime, water and a substance for adjusting the hydration reaction of quicklime in a specific ratio. CONSTITUTION:The desired crushing agent consisting of (A) 100pts.wt. quicklime, (B) 1-5pts.wt. water and (C) 0.1-5pts.wt. adjustor (e.g., aldonic acid, oxycarboxylic acid, formalin condensate of naphthalenesulfonic acid) for a hydration reaction of quicklime. 100pts.wt. crushing agent is blended with usually 20- 50pts.wt. water to give aqueous slurry, which is added to holes bored in a brittle material, and it is allowed to stand, so that the brittle material is crushed by the use of the expansion force of the slurry.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crushing agent for crushing so-called brittle objects such as rocks, concrete, and bricks without using explosives, and a method for producing the same.

More specifically, the present invention relates to a crushing agent for brittle objects made of quicklime powder, water, and a substance that adjusts the hydration reaction of quicklime, and its production and manufacturing method.

As a method for crushing these brittle objects, many proposals have been made in the past that utilize the expansion force caused by the hydration of quicklime. Specifically, this method involves making nine holes in a brittle object, filling the holes with an aqueous slurry of quicklime, and using the expansion force to crush the brittle object.
No. 5 is very violent. When water is added to quicklime powder and stirred to obtain an aqueous slurry, heat is generated during mixing, the slurry becomes stiff and stiff, and the flow required to fill the holes becomes difficult. They may not be able to maintain their sexuality. Although these undesirable phenomena can be alleviated to some extent by increasing the amount of water added to quicklime, in that case the hydration expansion pressure decreases, making it impossible to achieve the desired purpose. In addition, even after the aqueous slurry of quicklime is filled into the holes, the hydration reaction of the quicklime continues to progress, the internal temperature rises, the reaction is further accelerated, and finally reaches the boiling point, and the slurry together with water vapor The so-called gunshot phenomenon, in which water erupts explosively from the opening of the hole, can be dangerous. Because of these problems, it has been virtually impossible to use quicklime itself as a crushing agent for brittle objects.

In order to improve these problems, several proposals have been made, such as using quicklime together with cement, or using special clinker powder containing a large amount of quicklime instead of quickstone or ash, and some of them have already been put into practical use. What is being done (there is)

However, the above improvement method has the following problems.

That is, in the method of using special tallinker powder, the special tallinker is expensive and does not meet the current situation where this type of crushing agent is strongly required to be inexpensive compared to explosives. In addition, in the method of using quicklime together with cement, it is the quicklime that significantly expands in volume upon hydration that is involved in generating the expansion pressure to crush brittle objects, and the cement mainly serves to prevent the gunshot phenomenon. Considering that it is a useless product, it is not preferable to contain a considerable amount of components other than quicklime, as this will increase the expansion pressure.

Therefore, the inventor of this invention conducted intensive research to develop a crushing agent for brittle objects that uses quicklime itself, and as a result, he produced a mixed powder of quicklime, a small amount of water, and a small amount of quicklime hydration reaction regulating substance. By adding water to this mixed powder and injecting it as an aqueous slurry into a hole drilled in a brittle object and then leaving it to stand, dangerous phenomena such as gunshot phenomena will not occur even without the addition of cement. discovered that brittle objects could be crushed by the expanding force of quicklime, and completed this invention.

The mixed powder of this invention is, for example, 100 parts by weight of quicklime, 0.1 to 5 parts by weight of water and 0 parts of quicklime hydration reaction regulating substance.
．． It can be produced by adding 1 to 5 parts by weight, pulverizing, and further adding and mixing a hydration reaction regulating substance as desired.

Generally speaking, the fineness of the powder is high, that is, when the powder is ground relatively finely, the hydration reaction of the resulting mixed powder proceeds relatively easily, and water is added to the mixed powder to form an aqueous slurry. In this case, the time during which the brittle object has enough fluidity to fill the nine holes provided in it (hereinafter referred to as fluidity retention time) is shortened. , the hydration reaction of the resulting mixed powder progresses relatively, K<<, and the fluidity retention time becomes longer. Further, even if the degree of fineness is the same, the fluidity retention time varies depending on the quality of quicklime used as a raw material and the type of quicklime hydration reaction regulating substance.

Furthermore, the fluidity retention time also varies depending on the amount of water used in preparing the aqueous slurry, its temperature, and the outside temperature. As mentioned above, the effect of the mixed powder of this invention is influenced by various factors, so it is not necessarily appropriate to clearly limit the powderiness considering the nature of this invention, but roughly speaking, for example, 88 Decorative remainder is 10-60
The powder level is suitable.

The quicklime used in this invention can be commercially available lump quicklime or coarsely crushed quicklime obtained by crushing it to about the same size as, for example, 1105a #1i. The effect of this invention is particularly noticeable when the temperature of the so-called hard calcined lime zone is 1,200 to 1,4
Among the quicklime obtained at 00° C., the most preferred quicklime is one whose activity is 200 me or less according to the 100y method in the Japan Lime Association reference test method.

Hydration reaction regulating substances for quicklime include aldonic acids such as gluconic acid, glucoheptonic acid, and araponic acid; oxycarboxylic acids such as sugar acid, malic acid, citric acid, and tartaric acid; formalin conjugates of naphthalene sulfonic acid; and melamine sulfonic acid. Formalin conjugate or rigeninsulfonic acid,
Or their salts, etc. Salts of these quicklime hydration reaction regulating substances include, for example, alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as calcium salts and magnesium salts, and ammonicum salts. , trimethylamine salt, triethylamine salt, jetanolamine salt, triethanolamine salt, and other organic salts. These quicklime hydration reaction regulating substances may be used alone or in combination of two or more.

The specific embodiments of the method for producing a crushing agent for brittle objects according to the present invention are as follows.

l) For example, 10ml of lump quicklime! An aqueous solution or suspension consisting of 0.1 to 5 parts by weight of a quicklime hydration reaction regulating substance and 9.1 to 5 parts by weight of water, based on 100 parts by weight of coarsely crushed quicklime obtained by crushing to a uniform particle size. Add liquid and crush to obtain the desired crushing agent mixed powder.

At this time, as the quicklime hydration reaction regulating substance, the above-mentioned substances may be used alone, or, for example, a formalin condensate of naphthalene sulfonic acid or its salt, gluconic acid or its salt, or naphthalene sulfonic acid. Two or more types may be used in combination, such as formalin condensate or its salt and geninsulfonic acid or its salt.

2) The lump quicklime is coarsely crushed to a particle size of, for example, 1OIaIIllI8, and as a first step, 0.1 to 5 parts by weight of a quicklime hydration reaction regulating substance is added to 0.1 to 5 parts by weight of water per 100 layers of crushed quicklime. After adding 1 to 5 parts by weight of an aqueous solution or suspension and pulverizing to form a mixed powder, in the second step, a quicklime hydration reaction regulating substance is added and homogenized to obtain the desired powder. . In this case, a total of 0.1 to 5 parts by weight of the hydration reaction adjusting substance added in the first and second steps is added, and the quicklime hydration reaction adjusting substance used in the first and second steps is added. They may be of the same type, or two or more different types may be used in combination. For example, in the first step, a formalin conjugate of naphthalene sulfonic acid or a salt thereof may be used in addition to the hydration reaction regulating action of quicklime. In the second step, for example, gluconic acid or a salt thereof, or polygeninsulfonic acid or a salt thereof may be used in the second step. Further, in the above manufacturing method, in the first step, only water may be added alone without adding a substance that regulates the hydration reaction of quicklime.

100% quicklime produced by the above method, 0.1 to 100% water
Add 20 to 50 parts by weight of water to 100 parts by weight of a crushing agent for brittle objects consisting of a mixed powder of 5 parts by weight and 0.1 to 5 parts by weight of a quicklime hydration reaction regulating substance, and knead to obtain an aqueous crushing agent. The brittle object can be crushed using the expansion force of the slurry by injecting the slurry into a hole drilled in a brittle object and leaving it to stand.

Here, the standing time after pouring the slurry is usually 10 to 24 hours.
This time period is appropriately selected depending on the strength of the crushed object and the like.

Moreover, examples of crushed objects include rocks, concrete, and bricks.

In addition, in the reference examples and examples, tests to confirm the performance of the crushing agent for brittle objects were conducted using the following test method.

a) Measurement of expansion pressure JIS G3454 Carbon steel pipe for pressure piping 25 (A
) was cut into 40 lengths, welded one end of the pipe to a steel plate, and stood it vertically with the opening facing up. Paper strain gauges are attached to two locations around the outside of the pipe, and an aqueous slurry obtained by mixing a crushing agent with a predetermined amount of water is filled from the opening of the pipe to cool the outer wall of the pipe and reduce the expansion static strain of the pipe. The inflation pressure (Kyf/di) was determined by measurement and calculation.

The expansion pressure required for use as a crushing agent for brittle objects according to the present invention varies depending on the type of brittle object, but is approximately 250 m
Kgf/di or more is desirable.

b) Measurement of fluidity retention time Using a J-funnel for PC gract measurement from the Japan Society of Civil Engineers, mix the crushing agent with a predetermined amount of water to form an aqueous slurry.
Time required for 000#l/ to flow down the J funnel (seconds)
was determined over time, and the period in which the required time was within 30 seconds was defined as the fluidity retention time.

C) Measurement of heat generation onset time The crushing agent was kneaded with a predetermined amount of water to form an aqueous slurry, and a heat generation curve was drawn. The aqueous slurry of the crushing agent of this invention starts an exothermic reaction after a certain period of time. After preparing this aqueous slurry, the time until the exothermic reflex starts (hereinafter referred to as
If the heat generation start time is short (for example, within 5 minutes), it may cause a gun phenomenon, and also cannot be used for the purpose of the present invention from the viewpoint of workability.

d) Limestone crushing test Approximately, a limestone block with a diameter of 1.5 to 2 ms and a height of 1 to 1.5 m is used, and a diameter of 42 f is placed on top of it at an interval of 40σ.
i. A hole with a depth of 50σ is drilled, and a crushing agent of 100 ml is poured into the hole.
An aqueous slurry obtained by adding 30 parts by weight of water to the parts by weight and kneading was injected, and changes (such as whether or not cracks were formed in the limestone) after 15 to 24 hours were observed.

Hereinafter, the present invention will be explained in more detail with reference to Reference Examples and Examples.

Reference Examples 1 to 4 Crushed quicklime with 10 fins obtained from hard burned lump quicklime obtained at a firing zone temperature of 1.200 to 1.400°C was milled using a ball mill to obtain a fineness of 20% with 88 μ sieve residue. After pulverizing to 100 parts by weight, 0.5 parts by weight (Reference Example 1) and 1.0 parts by weight (Reference Example 2) of sodium salt of formalin condensate of naphthalene sulfonic acid were added and mixed. Quicklime powder and gluconic acid) 0.5 of IJ Kum
Quicklime powder was prepared by adding and mixing 1.0 parts by weight (Reference Example 3) and 1.0 parts by weight (Reference Example 4).
30 parts by weight of water at 20° C. was added to 0 parts by weight to form an aqueous slurry, and the heat generation start time and fluidity retention time were determined.

Results None of Reference Examples 1 to 4 can be used for the purpose of the present invention.6 Example 1 A 10-meter-long through-hole tube obtained from hard-burned lump quicklime obtained at a firing zone temperature of 1,200 to 1,400°C. Grinding in a ball mill while sprinkling 50 kg of crushed quicklime with a solution prepared by mixing 100 parts by weight of the crushed quicklime with 0.5 parts by weight of a sodium salt of a formalin condensate of naphthalene sulfonic acid and 1.0 parts by weight of water. The powder was ground to a powder content of 20%, including the residue on the 887 sieve. Sodium gluconate was added to the obtained powder at a ratio of 0.5 parts by weight per 100 parts by weight of the original coarsely crushed quicklime. A pulverizing agent for brittle objects was obtained by adding silica powder and swarming the mixture.

The resulting crushing agent was kneaded with water at 20°C at a ratio of 100 parts by weight of the crushing agent to 30 parts by weight of water, and the heat generation start time, fluidity retention time, and expansion pressure of the aqueous slurry were determined at 20°C.
Measurements were made indoors, and outdoor limestone crushing tests were conducted at temperatures of -6 to 4°C using mixed water at a temperature of 5°C.

Results Heat generation start time 50# Fluidity retention time 60 minutes Expansion pressure (24 hour value) 400Kgf/cII Limestone crushing test A crack occurs in a line connecting two holes,
Crushed (observed 18 hours after filling) Example 2 The firing zone temperature was 1. -10a obtained from hard-burned lump quicklime obtained at -200 to 1.400℃ + coarse crushed quicklime 50K through sieve
Spray a solution of 100 parts by weight of the coarsely crushed quicklime mixed with 0.5 parts by weight of sodium salt of formalin condensation of naphthalene sulfonic acid, 0.5 parts by weight of sodium gluconate, and 100 parts by weight of water. At the same time, pulverization using a ball mill was continued, and the powder was pulverized to a powder degree of 88 μv6 (remaining amount: 20%) to obtain a crushing agent for brittle objects.

The resulting crushing agent was mixed with 30 parts of water per 100 parts by weight of the crushing agent.
Aqueous slurry obtained by kneading parts by weight with water at 20°C.
The measurement was carried out indoors at a temperature of 0.degree. C., and the outdoor limestone crushing test was carried out using kneading water at a temperature of 5.degree. C. at an air temperature of -6 to 4.degree.

Results Heat generation start time 50 minutes Fluidity retention time 60 minutes Expansion pressure (24 hour value) 380 h f /cd
Limestone crushing test A linear crack was formed connecting the two holes, and the limestone was crushed (observed 18 hours after filling).

Example 3 Coarsely crushed quicklime 50 K passed through a 10 fl sieve obtained from hard burned lump quicklime obtained at a firing zone temperature of 1.200 to 1,400°C
Step 9: 100 parts by weight of the coarsely crushed quicklime was mixed with a solution of 1.0 parts by weight of sodium gluconate and 2.0 parts by weight of water, and crushed in a ball mill while sprinkling it to obtain a fineness of 88μ. The mixture was crushed to a sieve residue of 10 g to obtain a crushing agent for brittle objects.

The resulting crushing agent was mixed with 30 parts of water per 100 parts by weight of the crushing agent.
The heat generation start time, fluidity retention time and expansion pressure of the aqueous slurry obtained by kneading parts by weight with water at 20°C were determined to be 20% by weight.
The measurement was carried out indoors at 50°C, and the outdoor limestone crushing test was carried out using kneading water at 5°C at an air temperature of -6°C to 4°C.

Results Heat generation start time: 60 minutes Fluidity retention time: 10 minutes Expansion pressure (24 hour value) 360Kgf/cII!
Limestone crushing test A linear crack was formed connecting the two holes, and the limestone was crushed (observed 18 hours after filling).

Example 4 10III+# whole-phase crushed quicklime 5 obtained from hard burned lump quicklime obtained at a firing zone temperature of 1.200 to 1,400°C
0 kg, 100 parts by weight of the coarsely crushed quicklime, 1.
Grinding with a ball mill was carried out while sprinkling a mixed solution of 0 parts by weight and 2.0 parts by weight of water, and the powder degree was ss.
The powder was crushed with the pfa residue to obtain a crushing agent for brittle objects.

Add the obtained crushing agent to 100 parts of crushing material and 30 parts of water.
The heat generation start time, fluidity retention time and expansion pressure of the aqueous slurry obtained by kneading parts by weight with water at 20°C were determined to be 20% by weight.
The measurement was carried out indoors at a temperature of 0.degree. C., and the outdoor limestone crushing test was carried out using kneading water at a temperature of 5.degree. C. at an air temperature of -6 to 4.degree.

Results Heat generation start time: 10 minutes Fluidity retention time: 15 minutes Expansion pressure (24 hour value): 300 Kgf/c
d Limestone crushing test A linear crack was formed connecting the two holes, and the limestone was crushed (observed and observed 18 hours after filling).

Example 5 1 (50 kg of coarsely crushed quicklime passed through a 1 m sieve) obtained from hard burned lump quicklime obtained at a firing zone temperature of 1.200 to 1.400°C
Then, 100 parts by weight of the coarsely crushed quicklime was ground by a ball mill while sprinkling a solution of 0.5 parts by weight of sodium salt of a formalin condensate of naphthalene sulfonic acid and 1.0 parts by weight of water. The fineness is 88jfs.
The remaining material was ground to 20 pieces. To the obtained powder,
0.475 parts by weight and 0.475 parts by weight of sodium gluconate and malic acid were added to 100 parts by weight of the original crushed quicklime.
0.025 parts by weight was added and homogenized to obtain a crushing agent for brittle objects. The resulting crushing agent was kneaded with water at 20°C in a ratio of 100 parts by weight of the crushing agent to 30 parts by weight of water, and the heat generation start time, fluidity retention time and expansion pressure of the aqueous slurry were determined at 20°C. Measurements were carried out indoors, and limestone crushing tests outdoors were carried out using crosstalk water at a temperature of 5°C and at an atmospheric pressure of -6 to 4°C.

Results Heat generation start time: 60 minutes Fluidity retention time: 70 minutes Expansion pressure (24 hour value) 400Kgf/cM Limestone crushing test A crack formed in a line connecting two holes and the product was crushed (observed 18 hours after filling) .

Claims (1)

[Scope of Claims] ill An agent for crushing brittle objects comprising a mixed powder of 100 parts by weight of quicklime, 0.1 to 5 parts by weight of water, and 0.1 to 5 parts by weight of a quicklime hydration reaction regulating substance. (2) After crushing the lump quicklime, 0.1 to 5 parts by weight of water and 0.1 to 5 parts by weight of a quicklime hydration reaction regulating substance are added to 1 to 5 parts by weight of the coarsely crushed quicklime, and the mixture is crushed. . A method for producing a crushing agent for non-brittle objects, which comprises further adding and mixing a quicklime hydration reaction regulating substance to the obtained powder, if desired. (3) A crushing agent for brittle objects consisting of a mixed powder of 100 parts by weight of quicklime, 0.1 to 5 parts by weight of water, and 0.1 to 5 parts by weight of a quicklime hydration reaction regulating agent, and 20 to 5 parts by weight of water.
0 parts by weight is added and kneaded to obtain an aqueous slurry of the crushing agent, and the slurry is injected into a V-shaped hole in a brittle object and left to stand, thereby crushing the brittle object using the expansion force of the slurry. A method for crushing brittle objects characterized by: