JP3104036B2 - Static breaking agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breaking agent for statically crushing massive crushed objects such as concrete lumps and rocks.

[0002]

2. Description of the Related Art Means for filling a filling hole formed in a lump with a static breaking agent mainly composed of quick lime, adding water thereto, and using the energy of the hydration reaction to break up the lump. However, it has been difficult to precisely control the hydration reaction time to shorten the crushing time. Also, since the initial reaction of the breaking agent filled in the filling hole is fast,
Often, only the upper part reacted and did not react to the bottom of the hole, or a local reaction caused a squirt to impair safety.

Hitherto, as a technique for controlling the reaction between quick lime and water, which is a static breaking agent mainly composed of quick lime, addition of a third component such as a water reducing agent and co-firing in which ore such as silica is added to quick lime As the properties of the product or the quick lime itself, methods such as a change in the degree of firing and a particle size adjustment are employed.

[0004]

SUMMARY OF THE INVENTION Among these means,
The means for adding the third component accurately reacts because the reaction speed of quicklime and water changes depending on the type and amount of the added component, and furthermore, the mixing ratio with the main component quicklime and the particle shape are greatly affected. It was difficult to control Also, the method of adjusting the degree of calcination and particle size of quicklime is difficult to control the reaction with water at a rate that is troublesome in the production stage, and a particularly remarkable effect is obtained particularly with a breaking agent for the purpose of short-time crushing. I was not able to admit.

[0005] A method of weathering raw lime with water or steam has also been proposed, but its rate could not be adjusted by the reaction of water with a granulating destructive agent.

[0006]

Means for Solving the Problems The present invention has been made as a result of intensive studies to overcome such drawbacks.
The gist of the invention is that a static breaking agent containing 50% by weight or more of quicklime, wherein the static breaking agent is obtained by contacting carbon dioxide gas with raw quicklime powder and using carbon dioxide-treated quicklime. In static breakers.

[0007] As the raw quicklime powder, hard-burnt quicklime is usually used. Carbon dioxide gas treatment by blowing carbon dioxide gas is performed by leaving quicklime powder in a carbon dioxide gas atmosphere for about 1 to 30 minutes. The carbon dioxide gas treatment can be promoted by a method such as stirring and mixing the powder in an atmosphere or increasing the temperature. The atmosphere is preferably 100% carbon dioxide. Further pressurization can further promote the carbon dioxide gas treatment and shorten the treatment time.

By changing the processing conditions, quicklime having a different initial reaction with water can be obtained.

A crushing agent obtained by subjecting raw lime having a water content of 1.5% by weight or less to carbon dioxide treatment is particularly easy to control the initial reaction rate, and can be effectively used as a short-time crushing type.

[0010] The raw quick lime powder thus treated with carbon dioxide is usually made of Portland cement, alumina cement,
Alternatively, it is press-molded together with an auxiliary component such as borate to form a granule containing 50% or more of quick lime, which is used as a breaking agent.

[0011]

[Effect] This static breaking agent depends on the condition of carbon dioxide
It is easy to control the reaction rate with water,
By delaying the reaction in the initial process, it became possible to set an accurate setting at the start of the reaction. For this reason, it can be used without a breaking agent for the purpose of short-time crushing of 30 to 60 minutes or less,
At the same time, safety can be ensured without the risk of spouting.

In addition, since the control of the reaction rate is facilitated, the water content is low and the effective CaO component is large, so that a breaking agent can be obtained, and a high expansion pressure can be exhibited.

[0013]

EXAMPLE Hard-burnt lime powders with different moisture contents (Ca
O) was left for 5 to 30 minutes while being stirred in a 100% carbon dioxide gas atmosphere. After the standing treatment, alumina cement and calcium borate were added to and mixed with CaO, and the molded particles obtained by pressure molding with a briquetting machine were pulverized to about 1 to 10 mm to obtain a breaking agent.

The obtained breaking agent was used as a concrete specimen (6
(00 mm square), a hole having a length of 40 mmφ × 500 mm was made in the center, and 400 g of a breaking agent was filled, followed by pouring 150 g of water. As a comparative example, a sample using CaO untreated with carbon dioxide was also evaluated.

The results are shown in Table 1.

[0016]

[Table 1]

[0017]

The static breaking agent has the following effects.

[0018] No breaking agent was used for the purpose of short-time crushing for 30 to 60 minutes or less, and the crushing of a lump in a short time became possible.

A high expansion pressure and an improved crushing efficiency can be achieved.

The safety of the work in the vicinity of the filling hole is enhanced, water can be directly injected from the hole filled with the breaking agent, and the efficiency of the crushing work can be improved.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C09K 3/00 B02C 19/18

Claims (3)

(57) [Claims] 1. A static breaking agent containing 50% by weight or more of quicklime, wherein the static breaking agent has a water content of 1.5% by weight or less.
A static breaking agent characterized by using quicklime that has been carbon dioxide-treated by contacting quicklime powder with carbon dioxide. 2. A static fracture containing 50% by weight or more of quicklime.
In disintegrant, The static breaking agent is a raw material having a water content of 1.5% by weight or less.
The carbon dioxide treated raw carbon dioxide is brought into contact with quicklime powder.
It is characterized by using granules containing 50% or more of lime.
Marked static breaking agent. 3. The carbon dioxide gas treatment is performed by converting quicklime powder into carbon dioxide gas.
It is characterized by being left in the atmosphere for about 1 to 30 minutes
The static breaking agent according to claim 1.