TWI225441B - Method of using stone mud as a source for producing cement fiberboards - Google Patents

Abstract

Disclosed is a method of using stone mud as a source for producing cement fiberboards, wherein stone mud, paper pulp mud, paper pulp boards, furnace slag powder, and Portland cement are mixed in proper proportions. A small amount of interface treating agent is added and fully mixed with water. Cement fiberboards are produced by means of mat forming, trimming, curing and demolding and steam curing, whereby wastes such as stone mud and paper pulp mud may be recycled.

Description

1225441 V. Description of the invention (1) The present invention relates to a method for manufacturing, building, and curing fibers with waste materials such as stone sludge and pulp and paper sludge. BACKGROUND OF THE INVENTION A method for manufacturing a board, in particular, refers to a kind of waste material, which is fireproofed with a proper proportion of fire-resistant cement fiberboard. ≪ Description of prior art >

In recent years, due to the high prosperity and growth of cities in China, the problem of serious casualties due to fires has gradually emerged. The use of fire-resistant compartments and building materials in buildings has become the focus of legislation. According to the decree of Article 88 of the Building Law, since 1986, public places such as stores, offices, hospitals, cinemas, nightclubs, restaurants, dance halls, entertainment venues, exhibition venues, etc., must use fireproof building materials as compartments. + According to the statistics of the Ministry of the Interior, the whole year of fire-resistant building materials in China's compartments, the demand is: 85 XI 〇6 m2 / year, and the current domestic fire-resistant building materials use rate is only about 11%, far lower than advanced countries . Looking around today's domestic fire-resistant compartment panels are mainly imported and costly. In the past, asbestos-containing sheets were the best choice for first-class products with fire resistance, but as a result of domestic regulations, asbestos has been explicitly listed as a carcinogenic and harmful substance in the past j years, strict use of ^ ^ banned the use of them has led to a new generation of refractory sheet products in the market. Major changes. Commercially available flammable materials) materials) 0 fire compartment panel products can be roughly divided into flame-resistant first-grade materials (not, flame-resistant second-grade materials (fire-resistant panels), flame-resistant third-grade materials (flame-resistant materials in accordance with the first chapter of the Construction Technology Regulations Facility Work Article 1) Article 24, right

1225441

Definition of flammable materials (first-grade materials that are resistant to fire): non-combustible materials (grades that are resistant to fire), concrete, stele or hollow brick, tile, stone, artificial stone, asbestos products, steel, aluminum, glass, fiberglass, mineral wool, ceramics, mortar , Lime and other similar materials, those who have been qualified by the central government's main construction agency. Non-combustible materials (first-grade materials that are resistant to fire): In the early stage of the fire (before the occurrence of flashovers), it is not easy to cause combustion, and it is not easy to produce harmful dense smoke and gases. Its smoke coefficient per unit area is lower than 30, and at the same time at high temperature Damage, materials that do not have adverse phenomena (such as deformation, melting, cracking, etc.).

Article 25 of Article 1 of the "Design and Construction of Buildings in accordance with the Technical Rules of the Building" Definition of the fire-resistant materials (fire-resistant third-grade materials): Fire-resistant materials (fire-resistant second-grade materials): fire-resistant plywood, fire-resistant fiberboard, and fire-resistant plastic plates , Gypsum board and other similar materials have been qualified by the central competent construction authority. y Flame-resistant materials (three-grade materials): In the initial stage of the fire (before the occurrence of flashover), only a small amount of combustion will occur, and the burning speed is slow. The smoke coefficient of the unit & area is lower than 120, and at the same time in high temperature fire Damage, materials that do not have adverse phenomena (such as ㊣ shape, melting, cracking, etc.).

The stone sludge produced by the stone factory is estimated to be about 300,000 per year. An Environmental Protection Agency has listed the stone sludge on January 25, 1990 as a general business waste that can be reclaimed. If it is discarded, it will not be used. Not only does the wasteful use of resources also cause considerable harm to environmental protection. "~ Jia" and in view of this, the inventors have researched and improved these shortcomings, and the long-term research finally resulted in the present invention. ^

Page 51225441 V. Description of the invention (3) < General summary of the invention > Therefore, the present invention aims at providing a method for producing mud fiberboard by utilizing the recycling of stone sludge for re-resource production, according to such utilization of the present invention. Stone sludge is a manufacturing method of cement fiberboard produced by source chemical. It uses granite (including mica, feldspar, quartz) and marble (containing calcium carbonate) with good thermal insulation properties as a substitute for asbestos and vermiculite. , Perlite and inorganic mixed materials' and use pulp and paper sludge to replace organic fiber and inorganic fiber materials, and also use furnace stone cement as a substitute for some cement raw materials, and develop local industrial waste as a raw material for recyclable cement fiberboard . According to the method for manufacturing cement fiberboard produced by recycling resources of stone sludge according to the present invention, the cement fiberboard products manufactured by the method are mainly made of fireproof compartment building materials, and the basic specifications are the same as those of general commercial cement fiberboard products. 'Complies with CNS3802 fiber cement board product specifications, in terms of fire resistance' in line with CNS6532 Class I flame resistance test method for interior decoration materials. According to the method for manufacturing cement fiber 1 produced by recycling the stone sludge according to the present invention, the stone sludge and pulp and paper sludge are used as the main raw materials. The recycled cement fiber board produced can reach 120 kgf. / cm2 ^ above, the test bending strength, in accordance with CNS38〇2 fiber cement board product requirements. According to the manufacturing method of cement fiberboard produced by reutilization of stone sludge according to the present invention, stone sludge and pulp and paper sludge are used as raw materials for the production and reinvestment of each cement fiber board. The stone sludge is mainly marble and snake. Life, —Shang 7T: Second, the only material characteristic of stone sludge is the use of its main ingredients such as carbon, emulsified silicon, mica, feldspar and other advantages of low thermal conductivity, — ”,“ all 1225441 five, Description of the invention (4) is an ideal fire and heat insulation material for building materials. Pulp and paper sludge uses a large amount of natural wood fibers and has good toughness, which can effectively enhance the strength function of cement fiberboard products. Related to this project The research and development of production technology can be made into a recyclable cement fiberboard product with commercial characteristics. As for the detailed structure, application principle, function and effect of the present invention, it can be fully understood by referring to the following description with reference to the drawings. < Description of a preferred embodiment >, a method for manufacturing cement fiberboard produced by recycling the stone sludge in the present invention The method includes the following steps: 1. Selecting materials such as stone sludge, pulp and paper sludge, pulp board, furnace stone powder, butte cement, etc., and mixing them according to a certain ratio; 2. adding interface agents; 3. mixing with water; 4. operating Resulting type; 5 · cutting size; 6 · high pressure forming; 7 · health dehydration; 8 · steam health; 9 · sanding and cutting, chamfering; 1 10. inspection. After the pulp and paper sludge is taken, add it; /, 〃, sub-fabricated cement fiber board to produce a predetermined thickness 1225441 V. Description of the invention (5) (about 3 feet X 6 feet X 6mm thick), and then cut the appropriate size, After cutting is completed, an average pressure of 80 kg / cm2 is applied for about 20 minutes to perform high pressure molding; after that, steam curing is performed at 60 Torr, about 3 to 4 hours (healthy and peeling procedure); and then 160- 180 ° C, 10kg / cm2 steam autoclave for health, about 5 ~ 8 hours to make the produced stone wood fiberboard more stable; after that, sanding, cutting, chamfering and inspection and other processing Procedure: The proportion of the raw materials used above is as follows: Stone sludge content 30 ~ 40%, pulp and paper sludge content 丨 5 ~ 20%, pulp board content 8 ~ 15%, furnace stone powder content 5 ~, portland cement content 25 ~ 35%, interface agent content is small; after mixing the raw materials with water Mix at a ratio of 1: 9. Among them, the moisture content of the preformed slab embryo is about 60%, and after dehydration by pressure filtration, the content is about 30%, and the water-cement ratio of hydration is about 0.25 in theory. Normally, the water-cement ratio is about 0.45 ~ 0.6. Cement fiber slabs are generally used at 0.45. The initial setting to the final setting of cement is the slowest 2 1 4 minutes. Therefore, the cement fiber slab needs to be formed after molding. After presetting for 3 hours to stabilize the molding, steam high temperature curing is started. Steam curing (Steam Curing) Steam promotes the hydration of concrete, 0C) ~ 3 2 5 T (16 2 0C). : Using high temperature and high pressure saturated water, the normal operating temperature is about 250 ° F (120 quantitative raw materials for various stone sludge test (including marble, snake, aragonite, dagger, etc.), pulp paper sludge fiber, Raw materials such as cement, hearth powder, interface agent, etc. are sufficiently dispersed and mixed with water in a mixer to form a slurry < and then a reduced pressure dehydration device (the reduced pressure is about 2 coffee Hg) can be used.

$ 8 页 1225441 V. Description of the invention (6) Effectively promote the dehydration of the slab blank. At the same time, the proper thickness of the slab can be controlled by the quantitative determination of the sludge. Generally, the appropriate sludge concentration (about 8 ~ 1 0) %), The lower slurry concentration is helpful for the molding of the slab, but it is easy to lose the smaller particles. After forming the slab, the internal fiber has a good staggered structure. 'The hydration of cement belongs to the initial setting stage. At this time, the lignocellulosic fiber swells due to hydration.' Therefore, it is necessary to remove part of the The moisture also makes the slab reach a fixed thickness. In order to avoid damaging the structure of the slab, or causing the displacement of cement and fibers, resulting in uneven composition inside the slab, the pressurization process is gradually increased. Hold pressure for 2 minutes at final pressure. According to the present invention, cement fiberboard is trial-produced with different proportions of test materials for stone sludge (including marble, serpentine, granite, etc.). After mixing and copying board treatment and steam curing, it is pressure-molded at 80 kg / cm2. After being left to stand at room temperature for 28 days to complete the wet curing and curing, it was dried at 600 ° C for 6 hours, and then it was made into various physical property test specimens, including flexural strength, bulk density, and water absorption. Tests related to the physical properties of sheet materials such as the rate of change, the rate of change in water absorption length, the thermal conductivity, the flame-resistant substrate test, and the surface test CA value. The test results of the stone sludge cement fiberboard products of various proportions produced through preliminary trials show that the bending strength can reach more than 120 Kgf / cm2, which can meet the requirements of the fiber cement board products of CNS 3 802. Figures 2 and 3 show the comparison of the% flexural strength and bulk density test results of cement fiberboard samples with different raw material ratios. The numbered and 3_2 samples are 30% marble and 30% granite, respectively. Samples made of stone sludge, samples SDS-3 and SDS-4 both contained 15% marble and 15%

1225441, invention description (is a sample made of% granite stone sludge, but SDS-1, SDS-2 and SDS-3 are made by adding 25% pulp and paper sludge (residual wood fiber (Content is about 10%) ° and SDS-4 is added with 9% pure pulp wood fiber instead of pulp and paper sludge. The results show that SDS-4 with pure pulp wood fiber has the best flexural strength. The toughness and strength of the residual wood fiber of the mud is poor, but the strength ratio of the two boards can be adjusted appropriately. In addition, the comparison of the strength of ^ 1 shows that the sample made of granite stone sludge is more marble / defective. 'Ni' has better bending strength. Compared with the results of the bulk density test, the density of the four is between 1 · 4 and 1 · 5, and there is not much difference between them. The bulk density of the cement fiberboard of Q is similar to 1. 4 Figure 4 shows the addition of cement fiberboard with different pulp and paper sludge addition ratio. The results show that when the β scoop ratio of pulp and paper soil in recycled cement fiberboard increases, the The bending strength tends to increase, especially: i iT rate is between 0% and 30% At the same time, the increasing trend is even clearer, and the right and r are inconsistent with the wood fiber material contained in the pulp and paper sludge mentioned earlier. Recycling raw materials for cement fiber board production, there are also hydration of inorganic substances such as calcium oxide and calcium oxide contained in mud: organic furnace II in the product produced by cement during the curing process. The θ mud a-dimensional board production experience shows that the adiabatic resistance of 2: 1 will limit the sheet material of the hose fiberboard cement fiberboard product] relatively has a certain degree of negative impact on the degree 3.

Page 10 1225441 V. Description of the invention (8) Figure 5 shows the water absorption test of the raw material fiber sludge with different raw material ratios and mud mud fiber board samples. The results show that * 'there is a tendency for the water absorption of the board to decrease. This knot: the increase of the ratio of t should be used to recycle the cement fiber board products: the maximum S 7 7 clay fiber board that will benefit future calcium silicate boards or gypsum boards The product is suitable for use in subtropical domestic warm and humid climates with low f-rates. Figure 6 shows the relationship between the difference in water absorption length of granite stone sludge added fiberboard products. Sourced cement fiberboard contains granite stone sludge. Second: the water absorption length of the board changes slightly.] Once it is changed, the change is small. This may result in the hydration that occurs during the curing process of cement and other raw materials. There is a degree of 1, which results in that there is still a composition in the water immersion process according to the CNS6532 test specification. 'The first-grade flame-resistant surface test time is 10 minutes, and the smoke coefficient CA value must be less than 30 to meet the first-grade resistance Figure 7 shows the relationship between the CA value of the first-grade flammable surface test of cement fiberboard with different granite stone sludge addition ratios. The results show that the recycled cement fiber board contains granite stone sludge. When the ratio increases, the value of the first-grade fire-resistant surface test of the board tends to decrease significantly. As far as the most important description of this research and development of re-recyclable cement fiber board is concerned, this result also confirms the previous development of granite stone sludge raw materials as cement The function of adiabatic and incombustible raw materials of fiberboard products is determined to be feasible, that is, the greater the proportion of granite stone sludge raw materials used in cement fiberboard products, the absolute flame resistance of the board of cement fiberboard products is absolute.

Page 11 1225441 V. Description of the invention (9) Enhanced effect. Figure 8 shows the relationship between the water absorption length of cement fiberboard with different ratios of furnace stone powder instead of cement. The results show that when the ratio of cement powder with recycled stone fiber is increased, the rate of change in the water absorption length of the plate increases. This result is also related to the slower hydration of hearth powder during the maintenance process previously discussed. It is speculated that it should also be improved by increasing the oxidation dance (lime) or increasing the use of cement. And it can be adjusted and improved according to the actual performance requirements of the target product and the proportion of raw materials.

The feasibility and technology of fiberboard technology and products are affirmative and clear. In particular, when the domestic industry is facing a major impact of the opening up of international trade in recent years, the development of this re-resourced cement fiber board production technology will be able to establish a domestic independent fire-resistant partition board industry. In addition, the use of domestically produced re-resourced raw materials for development and utilization will effectively reduce the domestic production cost of fire-resistant materials and greatly enhance the domestic competitiveness of the domestic fire-resistant building materials industry. And it is not used publicly, which is in line with the regulations of the Patent Law. J, please ^ Product Chen Ming, the above is the preferred and specific function of this patent, every change made according to the concept of this creation, its resulting function ^

All spirits beyond the description and illustrations should: 应

Inside, together with Chen Ming.丨 made I

1225441 Brief description of the diagram. Figure 1 is a block flow chart of the present invention. Figure 2 is a comparison diagram of the bending strength test results of cement fibers with different raw material ratios in the present invention. Figure 3 is the density of cement fiber boards with different raw material ratios in the present invention. Comparison of measurement results; Figure 4 shows the relationship between bending strength of cement fiberboard with different pulp and paper sludge addition ratios; Figure 5 shows the relationship between water absorption of cement fiberboard with different stone sludge addition ratios according to the invention; Figure 6 The figure is the relationship diagram of the change rate of the water absorption length of the cement fiberboard with different stone sludge addition rates according to the present invention; FIG. 7 is the relationship diagram of the CA value change of the first-grade flame-resistant surface test with different stone sludge addition rates according to the present invention; Relation diagram of change rate of water absorption length of cement fiberboard with stone sludge addition ratio.

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Claims (1)

1225441 6. Scope of patent application: A method for manufacturing cement fiberboard using stone sludge re-recycling to produce cement fiber board. 2ττ, raw materials such as stone sludge, pulp and paper sludge, pulp board, furnace stone powder and Portland mud, After the preparation according to appropriate examples, add a small amount of interface agent, and mix with water filling ^, and pass through the forming, cutting, high-pressure forming, health de-filming, and high-pressure health treatment processes to achieve stone sludge and paper sludge. When the waste is reused, fiberboards with different fireproofing properties are produced. 2 · The manufacturing method as described in item 1 of the scope of the patent application, wherein the content of each component of the raw material is: stone sludge 300-400%, pulp and paper sludge 15-200%, pulp board 8-15%, Furnace powder is 5-15%, Portland cement is 25-35%. 3. The manufacturing method described in item 1 of the scope of patent application, wherein the ratio of raw materials to water is about 1: 9. 4 · The manufacturing method as described in item 1 of the scope of the patent application ^ wherein the step of health-removing film is carried out with steam at a temperature of 60 ° c for 3 to 4 hours. I., 5 · According to the scope of the patent application, the method of manufacturing Wanfa / Zhongnan pressure health regimen is 1 60 -1 80 ° C, 10Kg / cm2, and the temperature is 5 ~ 8 hours. Proceeder. Page 14