JP2006256909A - Rock wool manufacturing method and manufacturing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a rock wool having a homogenous quality in which a rock wool waste material used as a rock wool raw material may be fibrous or powdery or may be a material containing foreign matter such as a metallic material, further a waste material of a silica heat insulating material may be used as the rock wool raw material. <P>SOLUTION: In a manufacturing process for manufacturing the rock wool by charging a raw material consisting essentially of a blast furnace slag and coke into a melting furnace 2 to melt and forming the molten matter in a cotton shape by a cotton making machine 3, gathering a cotton-shaped matter and molding in a prescribed shape and size, and in a method for manufacturing the rock wool by reusing a recovered matter containing at least the rock wool waste material or the silica heat insulating material, the recovered matter is crushed, further a blast furnace cement and water are added to the crushed matter, and the mixture is kneaded, and the kneaded matter is formed and hardened in the prescribed shape and size and dried, and the dried matter is reused as the raw material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a raw material mainly composed of blast furnace slag and coke are charged into a melting furnace and melted, the melt is formed into a cotton shape with a cotton machine, and the cotton-like material is collected into a predetermined shape. The present invention relates to a method for manufacturing rock wool by reusing a recovered material including at least rock wool waste material or silica heat insulating material in a manufacturing process for manufacturing rock wool by molding into a size and a manufacturing apparatus thereof.

  Rock wool is melted by supplying silica or the like as co-coke from the upper part of the cupola to the raw materials such as blast furnace slag and natural rock, blowing in air or oxygen-enriched air from the lower part, and burning it. The molten metal is made into a fiber by a cotton machine, and the cotton-like product is collected in a cotton collection chamber, molded, cut into a predetermined width and length, and then accumulated and packed. And as a fireproof covering material or a heat insulating material, it is widely used from a thermal power plant, a chemical plant to a general house.

  When producing rock wool, rock wool waste is generated as waste material, particularly in the step of cutting to a predetermined width and length. In addition, when inspecting, repairing, or dismantling the above-mentioned facilities and ordinary houses, a large amount of rock wool waste is generated along with general building waste.

  Silica heat insulating materials are mainly composed of calcium silicate and are mainly used on the outer periphery of pipes and tanks in facilities such as thermal power plants and petrochemical plants. Yes. This silica heat insulating material is also generated in large quantities as a waste material when such equipment is inspected, repaired or dismantled, like the rock wool.

  Most of these waste materials (rock wool waste and used rock wool and silica heat insulating materials) are disposed of as industrial waste, but in recent years it has become difficult to secure such landfill sites, which is a major social problem. It has become.

  Accordingly, it is strongly desired to reuse the waste material as a recycled resource. In particular, with regard to rock wool waste and used rock wool (hereinafter referred to as “rock wool waste material”), the generated rock wool waste material is melted. Considerations have been made such as returning to a furnace (such as a cupola) or a cotton collection room for reuse.

  Such a prior art is widely known among those skilled in the art, and since there is no patent document or the like that is mentioned in detail, a prior art document cannot be disclosed.

  However, in the method of returning the rock wool waste material into the melting furnace, it is too light and does not enter the melting furnace even if it is put into the melting furnace, or it rises and scatters due to the rising air current due to the heat of the melting furnace. In addition, if a rock wool waste material containing moisture and having a certain weight is to be put into a melting furnace, temperature control is difficult and product quality is adversely affected.

  Therefore, a method for recycling rock wool by putting rock wool waste material into a cotton collection chamber and mixing it with cotton-like fibers produced from a molten material with a cotton machine has been studied, but various problems have arisen. .

  For example, in the cotton collection room, work is done to collect the melted raw material into a cotton machine and make it into cotton-like fibers, but there is a temperature difference between the input rock wool waste and cotton-like fibers. If a large amount of rock wool waste is added, the cotton-like fibers will be cooled rapidly, and the remaining heat will be taken away. There is a risk of adverse effects.

  Also, if the rock wool waste is in powder form, adhering in large amounts to the cotton fibers will adversely affect the product quality due to the cooling action as described above, or the cotton collection room collects air while sucking the air inside. In order to make cotton, powdery rock wool waste material may be sucked and discharged to the outside as it is.

  Furthermore, when the rock wool waste material is moistened with water, the temperature inside the cotton collection chamber may be lowered by the heat of vaporization, making it difficult to control the temperature in the cotton collection chamber requiring delicate temperature management.

  In addition, since the metal hardware (for example, nail etc.) or silica heat insulating material which can be contained in rock wool waste material has a component composition different from rock wool, when these are thrown into the cotton collection room with rock wool waste material. As a result, a mixture with different appearance and physical properties from the original rock wool is produced, and a homogeneous rock wool cannot be produced. Therefore, conventionally, the rock wool waste material that can be reused as a raw material is only the rock wool waste material from which foreign matters (for example, the above-mentioned hardware or silica heat insulating material) are completely removed, and therefore, for the foreign matter separation work in advance. A great deal of cost and labor is required.

  The present invention has been made in view of the above circumstances, and the rock wool waste material used as the rock wool raw material may be in the form of a fiber or powder, or may contain foreign matters such as hardware. In addition, it is possible to use rock wool that is slightly different in composition from rock wool, such as used silica preservatives, and can be used to produce rock wool that is homogeneous in quality and has no problems. A manufacturing method and a manufacturing apparatus are provided.

  The first characteristic configuration of the present invention is that a raw material mainly composed of blast furnace slag and coke are put into a melting furnace and melted, the melt is formed into a cotton shape with a cotton machine, and the cotton-like product is formed. A method for producing rock wool by reusing a collected material including at least rock wool waste material or silica heat insulating material in a production process for producing rock wool by collecting and molding into a predetermined shape and size, wherein the recovery is performed The material is pulverized, kneaded by adding blast furnace cement and water, dried into a predetermined shape and size, dried, and the dried material is reused as the raw material.

[Action and effect]
The rock wool produced by the present invention is a raw material mainly composed of blast furnace slag and coke, which is poured into a melting furnace and melted, and the melt is formed into a cotton shape by a cotton machine, and the cotton-like product. Are manufactured in accordance with a conventional rock wool manufacturing process in which they are collected and molded into a predetermined shape and size, and can be manufactured using existing rock wool manufacturing equipment.

  In addition, since it is possible to reuse at least the recovered material containing rock wool waste or silica heat insulating material, it is possible to inspect rock wool waste generated in the manufacturing process of rock wool, thermal power plants, petrochemical factories or general houses. It is possible to reuse waste materials including used rock wool and silica heat insulating material, which are also generated during repair and dismantling. Therefore, since it is not necessary to landfill these waste materials as industrial waste, the problem of shortage of landfill can be solved.

  Furthermore, since the recovered material is used after being pulverized, even if the recovered material is a mixture of rock wool waste material and silica heat insulating material, they can be mixed and made uniform, The kneading work in which blast furnace cement and water are added and kneaded later is much easier than in the case of cotton as it is. As a result, the recovered material and the blast furnace cement can be uniformly mixed, so that a kneaded product formed into a predetermined shape and size and solidified (solid block) is also homogeneous (component composition between each block) Are uniform, and each component is evenly distributed within the block). Since blast furnace cement is a substance mainly composed of blast furnace slag, which is the main raw material for rock wool, it has a composition similar to that of rock wool and does not adversely affect the quality of the manufactured rock wool.

  Next, the solid block is dried, and the dried product is reused as a raw material. Therefore, since the dry matter containing rock wool waste material, silica heat insulating material, etc. is molded and solidified to a predetermined shape and size with blast furnace cement, a certain amount of weight is secured, and the updraft in the melting furnace So that it can be thrown into the melting furnace. In addition, since a dry substance is thrown in, even if it puts in a high temperature melting furnace, temperature control is easy and there is no bad influence on product quality.

  Further, since it can be put into the melting furnace and melted, for example, even if foreign matters such as hardware (for example, nails) are mixed in the recovered material, the rock wool component is contained in the melting furnace. Specific gravity separation occurs between a blast furnace slag (for example, blast furnace slag) and a foreign substance (for example, a nail), and the foreign substance can be separated and removed. Therefore, the recovered material that can be used in the present invention does not have to be a rock wool waste material from which foreign matters such as nails are completely separated and removed, and the prior foreign matter separation work can be considerably reduced.

  Furthermore, the components of the melt (molten metal) in the melting furnace can be adjusted during melting. Therefore, for example, although the component ratio of rock wool is different, a silica heat insulating material having a similar component structure can be used as a recovered material in the present invention. In other words, the conventional silica heat insulating material has been regarded as a foreign substance, but it can be melted in a melting furnace. It can be added further and melted together to replenish. As a result, the component composition (component ratio and composition) of the molten metal can be approximated to the component composition of the original rock wool, and can be kept constant, and a homogeneous rock wool can be produced.

  A second characteristic configuration of the present invention includes a raw material melting means for melting a raw material mainly composed of blast furnace slag and coke, a cotton making means for forming a melt melted by the raw material melting means into a cotton shape, A rock wool production apparatus comprising a molding means for collecting and molding cotton-like materials produced by cotton means into a predetermined shape and size, and a pulverizing means for pulverizing a recovered material containing at least rock wool waste material or silica heat insulating material , Kneading means for adding blast furnace cement and water to the pulverized recovered material and kneading, and molding solidification means for molding and solidifying the kneaded material, and molding by the molding solidification means. There is a supply means for drying the solidified product and supplying the dried product as the raw material to the raw material melting means.

[Action and effect]
The rock wool manufacturing apparatus which can implement the rock wool manufacturing method which has an effect | action and effect of the 1st characteristic structure mentioned above can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment
Fig. 1 shows rock rock waste generated during the manufacturing process of rock wool in the conventional rock wool manufacturing process, or lock generated during inspection, repair, and dismantling of a thermal power plant, petrochemical factory, or general house. It is a block diagram which shows the process of reusing as a raw material the waste material (henceforth such waste and waste materials are collectively called "collected material") containing wool and a silica heat insulating material.
First, a conventional process for producing rock wool will be described. As shown in FIG. 1, the main raw material blast furnace slag (mainly composed of silicic acid component and calcium oxide) and the component adjusting auxiliary raw material (natural stone) are mixed at a predetermined blending ratio so as to be easily fiberized. It mix | blends, it cuts out from the raw material hopper 1 with fuel coke, and throws into melting furnace 2 (for example, cupola etc.). The raw material is melted in the melting furnace 2, becomes a molten metal of about 1500 ° C., and is supplied to the cotton machine 3. The molten metal supplied to the cotton making machine 3 is made into fiber by centrifugal force, further added with a binder (for example, thermosetting resin such as phenol resin, melamine resin, etc.) and collected in the cotton collection chamber 4. The collected rock wool is laminated to a predetermined thickness and molded in the curing furnace 5. The rock wool exiting the curing furnace 5 is cut into a predetermined width and length by a cutting device 6 equipped with a slitter or a cross cutter, and then collected and packed.

  Next, a process for reusing the collected material will be described. As shown in FIG. 1, the recovered material is pulverized by a pulverizer 7. Before crushing, foreign materials (such as hardware such as nails) contained in the collected material that are easy to remove (for example, relatively large materials) should be removed in advance using a magnet or the like to increase work efficiency. Further, problems such as hardware that is difficult to pulverize are caught in the pulverizer and the pulverizer breaks down.

  Subsequently, the pulverized product of the recovered material is blast furnace cement (cement produced by pulverizing blast furnace slag and mixed with lime, Portland cement, or baked gypsum) and water at a certain ratio (for example, pulverized product: blast furnace cement: water). = 1: 2: 4) kneaded by the kneader 8 and then poured into a mold and hardened (molding). In addition, as a formwork used at this time, a cube type (preferably, the length of one side is 40-80 mm) is preferable.

  Next, the solid block molded into the cubic shape is naturally dried (cured) until the water content becomes 10% or less. The dried solid block is supplied to the raw material hopper together with the raw material (main raw material and auxiliary raw material) and coke in the above-described rock wool manufacturing process, and is charged into the melting furnace 2 (for example, cupola). In addition, if the composition of the pulverized material is analyzed in advance and the components are adjusted using the auxiliary raw materials when melting, the recovered material that can change the component composition and supply amount (unstable) is used as the raw material. Even if it does, it becomes possible to make the quality of the rock wool produced | generated after that constant, and a rock wool stable in quality can be manufactured. Further, even when foreign matter such as metal is mixed in the pulverized product, specific gravity separation occurs in the melting furnace, and it is possible to remove the foreign matter, thus adversely affecting the quality of the generated rock wool. There is nothing.

Block diagram showing the process of reusing rock wool waste in the conventional rock wool manufacturing process

Explanation of symbols

1 Raw Material Hopper 2 Melting Furnace 3 Cotton Making Machine 4 Cotton Collection Chamber 5 Curing Furnace 6 Cutting Device 7 Crusher 8 Kneading Machine

Claims (2)

The raw material mainly composed of blast furnace slag and coke are put into a melting furnace and melted, the melt is formed into a cotton shape with a cotton machine, and the cotton-like material is collected into a predetermined shape and size. In a manufacturing process of molding rock wool by molding, a method of manufacturing rock wool by reusing a recovered material containing at least rock wool waste material or silica heat insulating material,
Rock wool production that pulverizes the recovered material, knead by adding blast furnace cement and water, molds and hardens the product into a predetermined shape and size, and reuses the dried product as the raw material Method. A raw material melting means for melting a raw material mainly composed of blast furnace slag and coke, a cotton making means for forming a melt melted by the raw material melting means into a cotton shape, and a cotton-like material produced by the cotton making means. A rock wool manufacturing apparatus equipped with molding means for collecting and molding into a predetermined shape and size,
Crushing means for pulverizing a recovered material containing at least rock wool waste material or silica heat insulating material, kneading means for adding blast furnace cement and water to the pulverized recovered material and kneading, and molding the kneaded material An apparatus for producing rock wool, comprising: a solidifying means for solidifying, a drying means for drying the material solidified by the solidifying means and supplying the dried product as the raw material to the raw material melting means.

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