JPS59159877A - Breaking agent for brittle substance - Google Patents

Abstract

PURPOSE:To provide a breaking agent for brittle substance such as rock, which has sufficient fluidity time even in winter season and is capable of producing a high hydration expansion pressure, prepared by adding a fluidizing agent and a carbonate to quick lime, fllowed by crushing. CONSTITUTION:The breaking agent for brittle substance (e.g. rock or concrete) is prepared by adding 0.1-5pts.wt. fluidizing agent (e.g. formalin condensate of naphthalenesulfonic acid) and 0.05-5pts.wt. carbonate (g. sodium carbonate) to 100pts.wt. quick lime. For improved performance, about 0.1-5pts.wt. water is added for partial slaking of the lime. For application, 20-50pts.wt. water is added to 100pts.wt. breaking agent to prepare an aqueous slurry, which is poured into a hole made in a brittle substance to cause breaking of the substance by expansive 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.

More specifically, it relates to a crushing agent for brittle objects consisting of a mixed powder of quicklime, fluidizing agent, and carbonate.

Many proposals have been made that utilize the swelling power of quicklime due to hydration. Specifically, this method involves drilling a hole in a brittle object, filling the hole with an aqueous slurry of quicklime, and using the expansion force to crush the brittle object, but in general, the hydration reaction of quicklime is very violent. When water is added to quicklime powder and stirred to obtain an aqueous slurry, heat is generated during kneading and the slurry becomes stiff, making it difficult to maintain the fluidity necessary to fill the pores. These unfavorable phenomena occur conspicuously during summer when the temperature rises, that is, at high temperatures when the hydration reaction rate is high. Although these unfavorable phenomena can be alleviated to some extent by increasing the amount of water added to the quicklime, in that case the hydration expansion pressure decreases, making it impossible to achieve the desired purpose. In addition, an aqueous slurry of quicklime is used to pore the slurry.

Even after filling the inside, the hydration reaction of quicklime continues to progress,
The internal temperature rises, which further accelerates the reaction until it reaches the boiling point and the slurry explodes out from the hole opening along with water vapor.On the other hand, in the winter when the temperature is low, the hydration reaction rate itself slows down. Although it is smaller than in the summer, the time required for an aqueous slurry obtained only from quicklime to have enough fluidity to fill a hole in a brittle object (hereinafter referred to as fluidity retention time) is still short. Furthermore, it is short and the expression of hydration swelling pressure is not sufficient.

The inventor of this invention conducted extensive research in order to obtain a crushing agent for brittle objects that has sufficient fluidity retention time in winter and develops high hydration expansion pressure, and added fluidization, thorns, and carbonate to quicklime. This invention was completed after coming to the conclusion that a new formulation could achieve this purpose.

The mixed powder of the present invention includes, for example, 100 parts by weight of quicklime, 0.1 to 5 parts by weight of plasticizer, and 0.05 to 0.05 parts by weight of carbonate.
It can be produced by adding 5 parts and pulverizing.

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 fluidity retention time is shortened, and on the other hand, if the fineness is low, that is, if the powder is ground relatively coarsely, the hydration reaction of the resulting mixed powder becomes relatively difficult to proceed, and the fluidity retention time becomes long. However, even if the powder level is the same, the fluidity retention time will vary depending on the quality of the quicklime used as a raw material, the type of fluidizing agent, and the carbonate. Furthermore, the fluidity retention time also varies depending on the strength of the 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 affected by various powders, so it is not necessarily appropriate to clearly limit its fineness considering the nature of this invention, but roughly speaking, for example, 88 Door n decoration remaining 10-60
A powder degree of about 1.9% is appropriate.

The quicklime used in this invention can be generally commercially available lump quicklime or coarsely crushed quicklime obtained by crushing it to the extent that it can be passed through a 10 mm sieve, but the effects of this invention are particularly @ What appears in the name is the so-called hard calcined quicklime, fired #8J: the degree of permeability is 1.200 to 1.
．． Among the quicklime obtained at 400'C, the most preferable quicklime is quicklime with a 1o fraction value of 200 ttle or less according to the 1ooy method in the Japan Lime Association reference test method.

Carbonates that can be used in this reaction 811 include lyticum salts of carbonate or bicarbonate, alkali metal salts such as nato, '4, cum salts, potassium salts, triethylamine salts, jetanolamine salts, triethanolamine salts, etc. Examples include organic base salts. These carbonates may be used alone or in combination of two or more.

As a fluidizing agent, naphthalene sulfonic acid pol-tl is used.
) M compound, polymarine condensate of melamine sulfonic acid or polygenine sulfonic acid, their alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as calcium salts and magnesium salts, and ammonium salts. , trimethylamine salt, triethylamine salt, jetanolamine salt, triethanolamine salt, and other organic salts, and these fluidizing agents may be used alone or in combination of two or more. .

The addition of the superplasticizer and carbonate used in this invention includes the temperature at which the crushing agent is used, the properties and fineness of the quicklime used, and the final addition to the quicklime (total addition of the superplasticizer and carbonate). ) and the mixing ratio of the fluidizing agent and carbonate, etc., so it is not necessarily appropriate to clearly limit the addition part, taking into account the nature of the present invention.

Generally speaking, when the final part is left to stand, it is preferable to use 0.1 to 3 parts by weight of 1'OO heavy part of quicklime when the crushing agent is used at a temperature of about 15 to 15°C.

When crushing lumpy or coarsely crushed quicklime,
Add 0.1 to 5 parts of water to 0 parts of OO,
More preferred crushing agents can be obtained by partially digesting quicklime. The water used to partially digest the quicklime may be used alone, or may be used together with the fluidizing agent or carbonate as an aqueous solution or suspension thereof.

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

1) Pulverize lump quicklime or coarsely crushed quicklime obtained by crushing it to a particle size that can pass through a 1OTITn sieve, and add 0.1 to 5 parts of a fluidizing agent and carbonate to 100 parts of this quicklime powder. 005 to 5 parts and mix to obtain the intended crushing agent mixed powder.

At this time, the fineness of the powdered quicklime is preferably 88 μIII lb with a residual content of 10 to 60%.

2) 0.1 to 5 parts of fluidizing agent and 0.5 to 5 parts of carbonate per 100 parts of crushed quicklime obtained by crushing lump quicklime or crushing it to a particle size of 10 mm. The mixture to which the heavy side is added is crushed to obtain the desired crushing agent mixed powder.

At this time, the fineness of the mixed powder is preferably such that the 88 fim 671 heavy residue is 10 to 60%.

3) For example, coarsely crush the lump quicklime to a particle size that can pass through a 10rIm sieve, and add 0.1 to 5 weight parts of plasticizer and 0.1 to 5 weight parts of water to 100 parts by weight (7) parts of the resulting coarsely crushed quicklime. The first part of the aqueous solution or suspension is added, and 5 to 5 parts by weight of carbonate 000 is further added and pulverized to obtain the intended crushing agent mixed powder.

At this time, the fineness of the powdered quicklime was 881m, and the residue on the sieve was 1.
A range of 0 to 60% is preferable.

4) Crushed lump quicklime to a particle size that can pass through a 10 mrn sieve, for example, and as a first step, for 100 parts by weight of coarsely crushed quicklime,
An aqueous solution or aqueous suspension containing 0.1 to 5 parts of a superplasticizer to 0.1 to 5 parts of water is added and pulverized to form a mixed powder, followed by a second step of adding 0.05 to 5 parts of carbonate. Add a 5-fold closed section and homogenize to obtain the desired powder.

After this, the fineness of the mixed powder is 88.4u + decoration residue is 1
A range of 0 to 60% is preferable.

100 parts by weight of the crushing agent for the brittle object produced by the above method are mixed with 20 to 50 parts by weight to form an aqueous slurry of the crushing agent, and the slurry is injected into the hole drilled in the brittle object. By allowing the slurry to stand, the expansion force of the slurry can be used to crush brittle objects.

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.

Examples of crushed objects include rocks, concrete,
Examples include bricks.

The same effect can also be obtained by dissolving the fluidizing agent and carbonate in water in advance and adding quicklime powder to form an aqueous slurry.

That is, 0.0 to 0.0 0.0 of the acid salt for the thickening part
By dissolving 5 to 5 parts by weight in 20 to 50 parts by weight of water and adding 100 parts by weight of quicklime powder to form a slurry, it is possible to prevent heat generation during kneading and maintain sufficient fluidity and N, making it easy to sludge. The brittle object can be crushed by injecting the slurry into a hole drilled in the brittle object and leaving it to stand.

The present invention will be explained below with reference to Examples.

In addition, in the examples, the test to confirm the performance of the crushing agent for brittle objects was conducted using the following test method. Ta.

a) Measurement of inflation pressure One end of the pipe cut into a length of 40 cm is welded to a steel plate, and the pipe is stood vertically with the opening facing upward. Pipe outer circumference 2
A paper strain gauge is attached to the opening of the pipe, and an aqueous slurry obtained by mixing a crushing agent with a predetermined amount of water is filled, and the expansion static strain of the pipe is measured and calculated while cooling the pipe outer wall. by inflation pressure (lv f /c!
11) was calculated.

The expansion pressure necessary for use as a crushing agent for brittle objects according to the present invention varies depending on the type of brittle object, but it is preferably about 200 kFlf/cd or more.

b) Measurement of fluidity retention time Using a J-funnel for PCC grafting from the Japan Society of Civil Engineers, mix the crushing agent with a predetermined amount of water to form an aqueous slurry.
The required time (seconds) for 0 me to flow down the J-funnel is determined over time, and the period in which the required time is within 30 seconds is defined as the fluidity retention time.

Example 1 Hard calcined lump quicklime calcined at a calcining zone temperature of 1,200 to 1,400°C was coarsely crushed and crushed so that the degree of greenstone obtained by passing through a 10 mm sieve reached 37% with a sieve residue of 88 μm. did.

To 100 parts of the obtained powder were added sodium salt of napucrene sulfonic acid formalin condensate (hereinafter abbreviated as NSA) and sodium carbonate in the proportions shown in Table 1, and the mixture was homogenized to obtain a brittle and object crushing agent. Ta. Obtained crushing agent 10
30 parts of water at 5°C was added to the 0 parts and kneaded, and the fluidity retention time and expansion pressure of the slurry were measured in a room at 5°C.

Table 1 Example 2 N per 100 parts of the coarsely crushed quicklime 50k17
5A1. ] 03 Chong Hui Club for 4 Chong Hui Club and Carbonated Sodium Club, oh!
Add water type 1 opening, fineness is 88μm711'1Fj
It was ground to a residual content of 40%. Obtained crushing agent 1
1 part of 30 weight G of water at 5°C was added to the 00M volume, and the fluidity retention time and expansion pressure of the slurry obtained by kneading were adjusted to 5°.
Measurements were taken indoors at C. Miscarriage 1 sex retention time is 75 minutes, 24
The inflation pressure after hours was 2301<gf/crd.

Example 3 For 50 kg of coarsely crushed quicklime, 100 f ￥ N per hanging part
Add 0.67 parts by weight of 5A and 1 type side of water to obtain a powder degree of 88.
It was ground to 40% with μIll sieve residue.

To 100 parts of the quicklime powder obtained, 30 parts of water at 5°C in which the chemicals shown in Table 2 were added and dissolved were added and mixed, and the Z fluidity retention time and swelling pressure were measured.

Table 2

Claims (1)

[Scope of Claims] +1+ 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 a fluidizing agent, and 0.05 to 5 parts by weight of carbonate. (2) 100M side of quicklime, 0.1 to 5 parts by weight of water, flowing!
A crushing agent for brittle objects made from a mixed powder of 0.1 to 5 parts of IJ forming agent and 0.05 to 5 parts of carbonate. (3) 100 parts of quicklime, 01 to 5 parts of superplasticizer,
Crushing agent for brittle objects consisting of 5 to 5 parts of carbonate and 20 to 50 parts of water 1.