JPS58104050A - Solidification preventing agent for blast furnace quenched slag - 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 present invention relates to a blast furnace quenched slag O caking inhibitor.

In detail, Shi〈 mainly contains barrels and one or more types of tang alcohol, which is a reduced derivative thereof, and is added to blast furnace slag to produce rapidly cooled blast furnace slag of p%±. This invention relates to an anti-caking agent for rapidly cooled blast furnace slag that makes it possible to suppress O caking for a long period of time.

Molten slag from a blast furnace (usually called a blast furnace) is treated with water,
Granular quenched blast furnace slag obtained by quenching using air, etc. has been widely used in cement as a substitute for quality #IIl, due to the depletion of natural sand or the deterioration of the quality of natural sand in recent years.・Used as fine aggregate for mortar, concrete, and concrete.

This quenched blast furnace slag has
There are granulated slag, granulated slag, etc.

Granulated blast furnace slag and air-crushed slag have irregular grain shapes and sizes immediately after sand is obtained through the quenching process, so in many cases, they are further processed by re-pulverizing to adjust the grain size, etc. It is done. As a result, granulated blast furnace slag, which had a tendency to solidify in the air even before processing, becomes more solidified after processing, resulting in a less solid state.It is necessary to prevent calcification during storage or transportation. It is. - The caking property of such rapidly cooled blast furnace slag varies depending on its particle size; the smaller the particle size, the smaller the particle size! Easy to tie, and
When stacking in the open, caking is more likely to occur, especially in the summer, so the higher the temperature, the less likely it is to solidify. Therefore, it is necessary to take some kind of anti-caking measures during the summer.

In order to prevent the solidification of blast furnace slag, the first method is to provide a post-processing step after production in the quenched slag production process or processing process. A method has been proposed for obtaining quenched blast furnace slag that does not solidify by adding a chemical to the quenched slag. An example of such a drug is
These are an aliphatic oxycarboic acid-based anti-caking agent according to No. 4-13049@, and a lidanine sulfonic acid-based anti-caking agent according to JP-A-56-78624.

The second method is 4I Open'11854-11230
No. 4 proposes a carbon dioxide treatment method for granulated slag. This is done by bringing the coal into contact with the processed granulated slag, making the slag inert and non-caking.
,Ah,,Kor. Considering *me**, the processing cost is recommended.

Therefore, the first method, which is considered to be possible by simply attaching some additional equipment to the existing equipment, is preferable as the ninth method to reduce the cost.

Under such circumstances, the inventors of the present invention conducted extensive experimental studies in search of a chemical that could prevent the solidification of rapidly cooled blast furnace slag over a long period of time, and as a result, they were fully satisfied with the above objective. This is the ninth achievement of the present invention.

That is, the object of the present invention is to provide water-soluble aldose-type monosaccharides excluding dione and triose, monosaccharides with pyranose structure, and monosaccharides having a furanose structure, ifg, polym, monosaccharides excluding diose and triose. This is an anti-caking agent for quenched blast furnace slag whose main component is one or more types of Alpur, which is a reduced derivative of sugars.

As an anti-caking agent □, diose and triose in monosaccharides have almost no effect, but tet□ having 4 or more carbon atoms: 1. P-me, pentose, hexo-□, j′1
A full dose of 11-su or Hegtome has an anti-caking effect and is effective. Similarly, ethylene dalycol and dalycerin yK, which are reduced derivatives of dioses and trioses, are not effective in preventing caking, but alcohols having 4 or more carbon atoms are effective. Therefore, for aldose type monomers and 701111 alcohols, those having 4 or more carbon atoms are suitable as anti-caking agents.

Monosaccharides with
fm, i.e. di-111 #l11 trisaccharides, tetrasaccharides,
Pentasaccharides and hexasaccharides also have similar anti-caking properties and are useful as blast furnace quenched slag O caking inhibitors.

However, with regard to polysaccharides, those with large molecular weights (about several million) such as starch or dalicorn are not soluble in water, so even if they have some degree of solidification prevention effect, sufficient effects cannot be expected. No. The reason why a sufficient effect can be obtained is that the anti-caking agent of the present invention is effective for cooling blast furnace slag after crushing processing because it contains tens of thousands of water-soluble components as active ingredients. Of course, it is also effective for rapidly cooling slag before processing.

(9) It is an essential condition that the anti-caking agent of the present invention contains the above-mentioned components, but these do not need to be pure.
By-products from the chemical industry that contain one or more of the above-mentioned components, as well as water and other impurities, can be easily handled as long as they are water-soluble.
, is valid.

Examples of saccharides used in the present invention include aldose II, tetroses such as erythritol and threose, pentoses such as arabinose, xylose, and sugarose, and hexoses such as glubosu, mannose, and galactose. However, there are monosaccharides that have a lanonis structure or a furanose structure. Also, ori:
/ml, trehalose, sucrose,
Maltose, cellulose onis, r-thiobiose, and lactose are effective), and in polyS*, anti-caking effects are observed in destri/etc.

On the other hand, effective alcohols include erythritol, arabitol, aysitol, etc., as well as hexyl alcohols such as solpi, to, mannitol, ishi, to, and dulcit.

When rapidly cooled blast furnace slabs are treated with the anti-caking agent of the present invention, a long-term anti-caking effect can be obtained. As a result, the quenched blast furnace slag particles t-cover, as this compound is difficult to dissolve in water.
It is thought that caking is prevented by preventing contact between particles or preventing elution of calcium.

Next, the amount of the agent required for treatment with the anti-caking agent of the present invention is preferably at least 0.0011 (violet) 9 cents or more based on the weight of the blast furnace quenched slag. Even when piled up outdoors at high temperatures of over 30 degrees Celsius in the summer, 0.02 times the weight is 0.02 times higher.

Caking will not occur if more than 1.0 cents is added. This addition amount is
In order to fully exhibit the effect of preventing caking of blast furnace slag, the temperature and humidity, which are the storage conditions, and the storage lI1. This is determined by the length of the slag, the particle size distribution of the quenched slag, the size of the slag, and its masonry.
Even if it is necessary to store it in a dangerous manner or to completely prevent caking, it is sufficient to add 0.02 weight tons or more. However, if too much Atb is added, no particularly noticeable effect can be expected, and O, OS
It is preferable to suppress the addition amount to no more than S weight free.

In order to add the above-mentioned required amount of chemicals to the rapidly cooled blast furnace slag, it is possible to dilute it as an aqueous solution to the corresponding amount, make adjustments once, and then add the water bath liquid to the rapidly cooled slag. . Methods of rounding include stacking rapidly cooled blast furnace slag in piles, spraying a chemical solution using a larder, etc., placing an aqueous solution of chemicals in a water tank, and passing the rapidly cooled slag through it. When re-crushing and processing the rapidly cooled blast furnace slag, a method of adding an aqueous chemical solution using a shower or the like may be considered. Although there are no restrictions on this method, it is necessary to choose a method that allows the drug to be dispersed as uniformly as possible.

On the other hand, after the quenched blast furnace slag is subjected to the above-mentioned treatment, it is covered with the otia-soluble salt-like addition compounds, etc., so when this quenched slag is used for cement mortar or concrete, the addition compound is There is a concern that it may inhibit the setting of the cement and have a negative effect on the strength of the concrete, etc. However, as a result of testing within the above-mentioned range of additive amounts, no such problem occurred. It was found that the blast furnace quenched slag anti-caking agent of the present invention is sufficiently effective.

As described above, by using the anti-caking agent of the present invention, it is possible to economically and sufficiently prevent caking of rapidly cooled blast furnace slag.

Examples of the use of the anti-caking agent for blast furnace slag according to the present invention will be described below, but the present invention is not limited thereto.

Example 1 A processed granulated blast furnace slag having the following properties was used as a sample.

Washing test 2.2191 (JIB-Mu-110
3] Coarse grain ratio 2.945 (JIB-Mu-11
02) First, regarding the various drugs shown by Hori IK, 25
A 0x diluted aqueous solution was prepared, and on the other hand, the processed granulated slag was dried under reduced pressure and aliquoted into 20 #s per 1 sample. Next, 1llil! 1.5111 of an aqueous solution of 1.511% of the 100% preservative agent was added to each sample slag, and each sample was mixed and stirred using a mixer so that the whole was sufficiently homogeneous. The amount of drug added at this time was '0.00 for all samples.
3-, and for those without any drug addition, only water was added at 1.511. The thus prepared granulated slag-treated sample was placed in a t-gallon can (1841 can), rocked back and forth and from side to side to tightly tighten the contents, and then sealed and cured outdoors.

The solid state is based on Mu8TM C403-65T! According to the rotator penetration resistance method, a penetration needle with a needle head of l- is slowly penetrated to a predetermined depth, and the force required at that time is 11 times the unit length, that is, the penetration resistance is evaluated. be. Here, the penetration depth is 20 cm, and 1
These 11 were measured every day 0.

The larger the value of the penetration resistance value of the kernels, the more advanced the caking is, and if no caking has occurred, the penetration resistance value remains almost the same as the initial penetration resistance value even after curing. - The results of the experiment thus displayed are Table 1. In addition, the temperature during outdoor curing was at an average level of 25 to 30 degrees Celsius. In the end, no chemicals were added! Compared to the blank blank, no caking occurred for samples 2 to 5 according to the present invention, whereas a certain degree of caking was observed in the starch of the sample Mura.

Mayu, from the results of samples A7 to 12, even the addition of 0.001 wt. has an anti-caking effect, resulting in 9.0.005 fLm.
If * is also added, a sufficient effect can be obtained.

On the other hand, in Samples 413 to 16 for comparison, it can be seen that the solidification has completely progressed, with almost no change from the blank.

Example 2 Next, granulated blast furnace slag after processing having the following properties was actually piled up, and the solidification status was observed using the same penetration resistance value as in Example 1.

Washing test 2411G (JIB-A-1103
fCj coarse grain ratio 2.922 (JI8 Town Mu-1
102)) Immediately before crushing during processing, a chemical aqueous solution adjusted to a chemical concentration of 0.75 wt. did.

The treated granulated slag (3G) was piled up in a pile about 3 meters high outdoors, and then the solidification status of the pile was examined for about a month, and the results were compared with one without any chemical additives. As shown in Table 2, the average temperature during this period was at a level of 25 to 30°C.

From this, it can be seen that the agent according to the present invention exhibits a sufficient anti-clumping effect even in actual piles. Here, the values are one-fifth to one-tenth of the values in Table 1, which are rounded and are not constrained by the gallon can container as in Example 1. ζAs a guideline for solidification, the penetration resistance value is 0.
．． 45 K#/ca or more may be considered to be in a substantially consolidated state.

Continuation of page 1 0 shots Akira Tanaka 2-21- Higashiyotsugi, Katsushika-ku, Tokyo 13 Inside Toho Chemical Industry Co., Ltd. 0 applicants Toho Chemical Industry Co., Ltd. 1- Kakigara-cho, Nihonbashi, Chuo-ku, Tokyo 4-9

Claims (1)

[Claims] Water-soluble aldose excluding dioses and trioses #I11 A type of shelf alcohol that is a single type of pyranose or furanose structure, orifII class, polysaccharide, and a reduced derivative of a class II class excluding dioses and trioses. Or an anti-caking agent for rapidly cooled blast furnace slag that contains two or more of these as main ingredients.