KR100935573B1 - Ultra light weight inorganic fine-grained aggregate and its manufacturing method - Google Patents

Abstract

The present invention relates to an ultra-light inorganic fine aggregate and its manufacturing method, and to improve the foaming and foam uniformity and prevent entanglement as compared to the conventional manufacturing method of artificial aggregate, as well as to reduce the weight and strength of the aggregate produced It is to promote. To this end, the present invention is an auxiliary component which is one or two or more mixtures selected from the group consisting of essential components of organic or inorganic binders as waste glass powders, foaming agents and molding aids, and reaction aids, diatomaceous earth, fly ash and perlite powders. The raw material composition containing the additive and sodium hydroxide as an optional ingredient is aged, and the aged raw material composition is primary-molded to prepare agglomerates, and then the aggregate is second-molded and foamed, and the ultra-light weight for rapidly quenching the expanded agglomerates. Providing a method for producing inorganic fine aggregate and the ultra-fine inorganic fine aggregate produced by the above method, while having the effects of improving foamability and foam uniformity, preventing entanglement, increasing strength, etc., specific gravity of 0.2 or less, size of 0.2 to 0.3 mm or less Waste glass and inorganic wastes as raw material composition By using the water, etc., it should be able to have an excellent effect in terms of environmental protection and resource recycling.

Light weight aggregate, fine grain, ultra light, aging, quenching

Description

Ultra light weight inorganic fine-grained aggregate and its manufacturing method

The present invention relates to an ultra-light inorganic fine aggregate and its manufacturing method, and to improve the foaming and foam uniformity and prevent entanglement, and to reduce the weight of the aggregate produced and to enhance the strength compared to the conventional manufacturing method of artificial aggregate It relates to an ultra-light inorganic fine particulate aggregate and a method for producing the same.

In general, concrete is the most widely used in the past as a building and civil engineering material, and as a result of the recent increase of concrete buildings, the construction of concrete buildings is trying to reduce its weight. Much effort is being made to reduce the weight of aggregates, which have the greatest impact on specific gravity among materials.

In addition, it is increasingly difficult to supply high-quality concrete aggregates in a limited aggregate source, and supply and demand aggregates, such as river sand and strong gravel, are collected from rivers. Therefore, in order to solve these problems, interest in artificial lightweight aggregates is increasing, and in particular, many research and developments are being made on artificial lightweight aggregates. In other words, the light weight aggregate can be used to produce light weight concrete. Accordingly, the energy saving effect and the dependence of insufficient natural aggregate can be lowered through the increase of the building's insulation performance along with the increase of the building's height.

In addition, the deck of the ship should be finished with a certain thickness (about 7mm) of unsatisfactory parts such as welded parts. In the past, it was finished by thin coating using non-combustible polymer cement or polymer, but cement has a specific gravity. There was a problem in reducing the overall weight of the vessel, high, such as polymers are not used due to the generation of toxic gases in the fire.

Therefore, there is no problem in fire, it is possible to reduce the overall weight of the ship, in consideration of improving the strength of the construction material it can be said that it is preferable to use a lightweight aggregate, which is an inorganic material in cement as a filler.

However, existing lightweight aggregate could not be applied to ships because it is too large. Conventional artificial lightweight aggregates are used as raw materials such as coal ash (Domestic Patent Publication No. 95-8609) or asbestos (Domestic Patent Publication No. 81-123). , Waste plastic (Domestic Patent Publication No. 80-1056), coal mine waste stone (Domestic Patent Publication No. 80-1054), shale (Domestic Patent Publication No. 79-1985), sediment of sedimentation pond (Domestic Patent Publication No. 73-166) ) And waste materials such as red clay (Korean Patent Publication No. 71-242). The use of such materials may be desirable in the method of recycling waste, but since the granularity of light aggregates and miscellaneous wastes are used as raw materials, the specific gravity and the shape of the cells are also very heterogeneous. Therefore, the raw materials and methods as described above can not expect the effect of improving the foaming and foam uniformity of the lightweight aggregate produced, preventing tangling, and even if manufactured, the specific gravity is more than 0.5, the size is not less than 1mm, and many problems in strength as well. There was this.

The present invention is to solve the above problems, by using the waste glass powder as a raw material composition for producing light weight aggregates can not only have an excellent effect in terms of recycling environmental protection resources, but also includes a aging process and quenching process The improved manufacturing method not only has the effect of improving the foamability and foam uniformity of the lightweight aggregate, preventing entanglement, and increasing the strength, but also enables the production of ultra-light fine aggregates having a specific gravity of 0.2 or less and a size of 0.2 to 0.3 mm or less. There is this.

In order to achieve the above object, the present invention, one or two selected from the group consisting of an essential ingredient consisting of an organic or inorganic binder as a waste glass powder, a blowing agent and a molding aid, and a reaction aid, diatomaceous earth, fly ash and perlite powder. Aging raw material composition containing a supplementary additive and sodium hydroxide, which are mixtures of species or more, as an optional ingredient, firstly molding the matured raw material composition to prepare agglomerates, secondly molding and foaming, and then quenching the expanded agglomerates Provided is a method for producing an ultra-light inorganic fine particulate aggregate.

In addition, the present invention provides an ultra-light inorganic fine particulate aggregate produced by the above production method in order to achieve the above object.

In the method for producing the ultra-light inorganic fine aggregate, the essential component is 70 to 95% by weight of waste glass powder, 4 to 20% by weight of blowing agent and 1 to 10% by weight of organic or inorganic binder as a molding aid. The embodiment made up can be comprised.

In addition, in the manufacturing method of the ultra-light inorganic fine aggregate, the optional component, based on 100 parts by weight of the essential components, 1 to 20 parts by weight of the reaction aid, diatomaceous earth, fly ash and perlite powder is selected from the group consisting of 1 The embodiment which consists of 1-40 weight part of supplementary additives which consists of a species or 2 or more types of mixtures, and 1-20 weight part of sodium hydroxide can be comprised.

In addition, in the production method of the ultra-light inorganic fine particulate aggregate, the maturation of the raw material composition, may be configured to the embodiment aged for 1 to 3 hours at 65 ~ 120 ℃.

In addition, in the manufacturing method of the ultra-light inorganic fine particulate aggregate, the primary molding, it is possible to form an embodiment of molding at a temperature of 300 ~ 450 ℃ by supplying the aged raw material composition to the rotary kiln.

In addition, in the manufacturing method of the ultra-light inorganic fine aggregate, the secondary molding, after the primary molding, may be configured to form an embodiment of the aggregate formed in the rotary kiln at a temperature of 800 ℃ ~ 1100 ℃. .

In addition, in the manufacturing method of the ultra-light inorganic fine particulate aggregate, the secondary molding may be configured to perform an embodiment by adding a ceramic-based release agent sintered at a higher temperature than glass.

Further, in the method for producing the ultra-light inorganic fine aggregate, the rapid cooling of the foamed aggregate is an embodiment of rapid cooling at the inlet temperature 750 ℃ ~ 800 ℃ outlet temperature 40 ℃ ~ 60 ℃ of the quench machine. Can be configured.

In addition, the quenching machine used in the quenching step may constitute an embodiment using a rotating tubular water-cooled quencher.

According to the present invention, it is possible to prepare ultra-light fine aggregates having a specific gravity of 0.2 or less and a size of 0.2 to 0.3 mm or less while having the effects of improving foaming and foam uniformity, preventing entanglement, and increasing strength, as well as waste glass as a raw material composition. And by using the inorganic waste by-products, etc., it is possible to obtain advantages such as to have an excellent effect in terms of environmental protection and resource recycling.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and effect of the preferred embodiment of the present invention.

1 is a process chart of the manufacturing method of the ultra-light inorganic fine aggregate aggregate according to an embodiment of the present invention, the present invention is, as shown, to mature the raw material composition containing the essential and optional ingredients, the raw material composition After primary molding to prepare agglomerates and secondary molding to foam, the foamed aggregates are quenched to produce ultra-light inorganic fine particulate aggregate, the essential components are waste glass powder, foaming agent and molding aid It is composed of an organic or inorganic binder, characterized in that the optional component consists of a co-additive and sodium hydroxide, one or two or more selected from the group consisting of reaction aids, diatomaceous earth, fly ash and perlite powder.

The essential component may be variously applied to the mixing ratio of the organic or inorganic binder as the above-mentioned waste glass powder, foaming agent and molding aid, in one embodiment, 70 to 95% by weight of the waste glass powder, foaming agent 4 It is preferably made of 1 to 10% by weight of the organic or inorganic binder as ~ 20% by weight and the molding aid, because the content of the molding aid is too low to be brittle, difficult to mold, the content of the molding aid is too This is because when it is large, self-aggregation and adhesion occur in the equipment, and molding becomes difficult. As the organic or inorganic binder to be used as a molding aid, for example, an inorganic binder such as sodium silicate (water glass), an organic binder such as aqueous PVA solution, aqueous methyl cellulose solution or the like can be used.

The optional component may be variously applied to the mixing ratio of the above-described reaction aids, co-additives and sodium hydroxide, as an example, based on 100 parts by weight of the essential components, 0 to 20 parts by weight, diatomaceous earth, It is preferable to consist of 0 to 40 parts by weight of an auxiliary additive and 0 to 20 parts by weight of sodium hydroxide, which are one or two or more mixtures selected from the group consisting of fly ash and perlite powder. If the content of sodium hydroxide to prevent too much can cause excessive foaming and strength reduction, if the content of the auxiliary additives is too large because the bubble wall is excessively thick can cause poor foaming.

The aging process of the raw material composition containing the essential and optional ingredients as described above, for foaming improvement and foam homogenization, can be aged under various conditions, but in one embodiment it is aged for 1 to 3 hours at 65 ~ 120 ℃ The reason for this is that when the temperature is 120 ° C. or higher, irregularity of internal and external properties occurs due to the rapid and excessive surface drying of the mixed batch, and the granules produced during the granulation process are broken down so that a lot of powdery phase results in product yield. If the temperature is lower than 65 ℃, the reaction temperature is low, the aging is not properly done, it takes a lot of time for aging, productivity is reduced, if the time is too long more than 3 hours, due to excessive drying conditions of the granules Product yield and productivity decrease due to many powdery phases due to crushing, and reaction time is insufficient when time is too short. It is because due to not enough aging effects occur.

In general, the foaming principle of the foamed glass is to form gas as the foaming agent decomposes as heat is applied while the foaming agent penetrates the cullet powder, thereby generating pores. In the conventional manufacturing process, calcium phosphate (or liquid phosphate), which is a foaming agent, is formed. As calcium did not sufficiently penetrate into the powder glass and did not have time to react, there was a lack of foaming degree or uniformity, but in the manufacturing method according to the embodiment of the present invention, the blowing agent and the powder glass were mixed. Afterwards, according to the expansion of foaming as it is aged for 1 to 3 hours in a temperature range of 65 to 120 ° C., ultra-light weight products having a specific gravity of 0.2 or less (0.10 to 0.20) can be manufactured, as well as improved uniformity of presentation, FIG. 2. As can be seen from the comparison of the state of the particulate light aggregate shown in the state of the ultra-light inorganic fine aggregate of the present invention shown in Figure 3, the blowing agent and the glass powder The reaction with uniform pore size and because of the distribution of the interior of and is able to receive a uniform.

The primary molding is to obtain spherical aggregates through molding, and can be molded by applying various equipment and conditions. As an example, the primary molding is preferably supplied at a rotary kiln and formed at a temperature of 300 to 450 ° C. The reason is that if the primary molding temperature is too low, the cohesive strength is weak and the molding strength can be easily broken, and if too high, the secondary reaction between the components (foaming) makes it impossible to produce aggregate.

The secondary molding is for foaming spherical aggregates obtained by the primary molding, and may be molded by applying various facilities and conditions. As an example, after the primary molding, the produced aggregates are rotary kiln. It is preferable to mold at a temperature of 800 ° C. or higher and 1100 ° C. or lower, because in the second molding, the glass softens and sinters, and at the same time, the blowing agent decomposes, releasing gas components, and the released gas is released into the sintered fine particles. In the second molding, when the temperature is too low, the foaming is not properly performed, the specific gravity becomes excessive, and the production of lightweight aggregate becomes impossible. If the temperature is too high, it is difficult to maintain the shape due to excessive liquid production and adhesion. Etc. may occur.

In addition, in the secondary molding, the glass is sintered so that aggregates may be stuck to each other. In order to prevent this, it is preferable to carry out by introducing a ceramic mold release agent which is sintered at a higher temperature than glass, and zircon sand and kaolin as a ceramic mold release agent. In addition, a low cost general ceramic powder may be used which is sintered at a higher temperature than glass. On the other hand, the release agent used is reusable, thereby reducing the manufacturing cost.

The first molding and the second molding may be performed in different rotary kilns, but in order to reduce manufacturing costs, it is also possible to perform secondary molding followed by primary molding in a single rotary kiln.

The quenching process of the foamed aggregate is a process for improving the foam, strength and preventing entanglement of light weight aggregates, usually foaming is possible through the prevention of pore shrinkage in the aggregate due to the slow cooling of the foamed aggregate, the strength is improved It is possible by the reinforcing principle due to the formation of surface compression stress due to the surface quenching of the glass, and also to prevent entanglement is possible by the separation effect due to surface shrinkage and microcracks generated by the surface quenching, in one embodiment of the present invention, Cooling to 40 ~ 50 ℃ in 20 ~ 30 minutes at inlet temperature of 750 ~ 800 ℃ by using the tubular rotary equipment connected in the foaming process, the expanded aggregate prevents volume reduction due to instant quenching and maintains the foaming state. It is possible to manufacture ultra-light weight aggregate (low specific gravity 0.2 or less) with low specific gravity. Is due to the temperature difference between the portion to be a compressive stress formed in the surface strength is improved, so that the quench be done As prevent surface portion by shrinkage and flocculation is separated from the surface caused by micro-cracks.

On the other hand, it is possible to apply a variety of equipment and conditions to perform the quenching process, but in one embodiment, it is possible to use a rotating tube-type water-cooled quenching machine, the cooling and residence time can be maintained in the range 20 to 30 minutes The reason is that if the cooling and dwelling time is maintained at 30 minutes or more, the cooling rate is low, so the cooling effect is insufficient. This is because cracks may occur to lower the strength.

In addition, the present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope of the technical idea of the present invention. It will be apparent to those of ordinary skill in the art.

1 is a process chart of the manufacturing method of ultra-light inorganic fine particulate aggregate according to an embodiment of the present invention

Figure 2 is a photograph taken with an electron microscope of the state of the conventional fine aggregate aggregate

Figure 3 is a photograph taken with an electron microscope of the state of the ultra-light inorganic fine particulate aggregate according to an embodiment of the present invention

Claims (10)

As waste glass powders, foaming agents and molding aids, an essential ingredient consisting of an organic or inorganic binder, a co-additive and sodium hydroxide which are one or two or more mixtures selected from the group consisting of reaction aids, diatomaceous earth, fly ash and perlite powder are selected. Aging is carried out for 1 to 3 hours at 65 to 120 ℃ raw material composition containing as a component, After the aged raw material composition is primary molded to produce an aggregate and secondary molded and foamed, The foamed agglomerates were quenched using a tubular water-cooled quenching machine under an inlet temperature of 750 ° C to 800 ° C and an exit temperature of 40 ° C to 60 ° C. Ultra-light inorganic fine aggregate aggregate manufacturing method. The method of claim 1, The essential ingredient, 70-95% by weight of waste glass powder on a solids basis; 4-20 wt% of blowing agent and 1 to 10% by weight of an organic or inorganic binder as a molding aid Ultra-light inorganic fine aggregate aggregate manufacturing method. The method of claim 1, The optional ingredient, 1-20 parts by weight of the reaction aid based on 100 parts by weight of the essential components; 1 to 40 parts by weight of an auxiliary additive comprising one or a mixture of two or more selected from the group consisting of diatomaceous earth, fly ash and perlite powder; And Consisting of 1-20 parts by weight of sodium hydroxide Ultra-light inorganic fine aggregate aggregate manufacturing method. delete The method of claim 1, The primary molding, The aged raw material composition is supplied to a rotary kiln to be molded at a temperature of 300 to 450 ° C. Ultra-light inorganic fine aggregate aggregate manufacturing method. The method of claim 1, The secondary molding, After the primary molding, the produced aggregate is molded in a rotary kiln at a temperature of 800 ℃ ~ 1100 ℃ Ultra-light inorganic fine aggregate aggregate manufacturing method. The method of claim 1, The secondary molding, Performed by adding a ceramic-based release agent sintered at a higher temperature than glass Ultra-light inorganic fine aggregate aggregate manufacturing method. delete delete Ultra-light inorganic fine aggregate aggregate produced by the manufacturing method of claim 1.

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