TWI675812B - Method of fabricating green desiccant wheel - Google Patents

Abstract

A manufacturing method of green environmental protection dehumidification wheel, which is based on the development and purification of aluminum slag for purification and separation of environmentally friendly regenerated aluminum hydroxide and alumina adsorption material as a base material, which is added to a 3D mesh structure foam carrier, and the foam is transferred through a sintering process. In addition to the porous ceramic wheel body with an open-cell porous three-dimensional network skeleton structure, the porous ceramic wheel body is used as the main body, and an activated alumina adsorption monomer is added. After high temperature sintering, the surface is hardened and attached to the inside of the macropores. The surface of the ceramic wheel body evenly spreads many micropores, forming a composite adsorption material of the microporous surface and porous ceramics, increasing the contact area with humid air, improving the moisture absorption capacity, and finally integrating the development of a green, environmentally friendly and efficient dehumidification wheel. In this way, the recyclable materials can be recycled with the same grade or upgraded, and then made into new materials and products to solve the environmental problems derived from waste, increase the life cycle of resources, and establish a model of circular economy, which can effectively increase industrial efficiency.

Description

Manufacturing method of green environmental protection dehumidification wheel

The invention relates to a method for manufacturing a green and environmentally friendly dehumidification wheel, in particular to a technology and method for developing effective material regeneration for the aluminum smelting industry waste (smelting slag), and the development of environmentally sustainable environmentally friendly adsorption materials (alumina and aluminum hydroxide). Alumina) production technology (including purification, refining and synthesis).

The applicant of this case, the Institute of Nuclear Energy, accepted the commission of the domestic aluminum metal smelting industry from 1999 to 103 to develop the technology of purifying aluminum slag and replacing alumina raw materials to make high-alumina refractory bricks. The technology authorization and transfer were completed in 104 This production technology obtained the approval of the Ministry of Economic Affairs to issue the smelting aluminum slag reuse license, and was able to produce and sell resource-based products. The company became the first domestic legal aluminum slag recycling company. The Nuclear Energy Research Institute is very familiar with the ecology and waste distribution of the industry, and has a very good research foundation and development energy for the treatment of aluminum slag and green materials, as well as preliminary research and industrial results. At present, the raw material source of aluminum hydroxide is the ceramic material obtained by mining natural bauxite and refining it through physical and chemical procedures. The precursor source of the alumina material is bauxite. After the purification process, the preparation methods are mainly fixed sintering method and rotary kiln calcination method. Both methods require long-term calcination and subsequent processing. It takes a lot of time and energy to increase energy consumption and carbon dioxide emissions, which is a relatively uneconomical and environmentally friendly process. In addition, there are no quarries and production units in China, and they mainly rely on imports to supply raw materials. In view of the increasing concentration of ownership of existing raw materials, in the face of these multinational corporations monopolizing the raw materials, so that the price of raw materials can be manipulated by a few multinational corporations, develop a set of inventions that can solve the related environmental problems and break the bottlenecks in raw material costs It is necessary.

The main purpose of the present invention is to overcome the problems encountered in the conventional techniques and provide an effective material regeneration technology and method for the aluminum smelting industry waste (smelting slag), and develop an environmentally sustainable and environmentally friendly adsorbent material (hydrogen Alumina and alumina) production technology (including purification, refining, and synthesis), the same grade of the reusable materials or upgrade recycling, and then make new materials and products of green environmental protection dehumidification wheel manufacturing method. A secondary object of the present invention is to provide a regenerated aluminum hydroxide or alumina material as a base material, which is added to a foam carrier having a network structure, and then the foam is removed through a sintering process to leave a porous nature. The network structure, as a porous ceramic dehumidification wheel structure, has the characteristics of good chemical stability, mechanical strength and high temperature resistance, no powder, no aging, and can be repeatedly cleaned and reused. It can solve the environmental problems derived from waste. , Increase the life cycle of resources, establish a model of circular economy, and expand the manufacturing method of green environmental protection dehumidification wheels that increase industrial efficiency. In order to achieve the above object, the present invention is a method for manufacturing a green and environmentally friendly dehumidification wheel, which includes at least the following steps: (A) the purification and extraction step of waste aluminum slag: adding uncalcined waste aluminum slag to an alkaline aqueous solution to extract aluminum element into aluminum Sodium hydroxide aqueous solution to produce high-purity aluminum hydroxide and alumina adsorption material; (B) slurry preparation step: using the aluminum hydroxide and alumina adsorption material as a base material, adding a rheology additive of 0.1% to 50% , 0.1% to 30% of anti-foaming agent, and 0.1% to 60% of coagulant to form ceramic slurry, promote the viscous flow properties of the ceramic slurry to reduce bridging; (C) molding process step: adding the ceramic slurry Into a carrier material with a 3D network structure; and (D) drying and sintering steps: the carrier material is removed by high temperature combustion through a sintering process to produce a recyclable dehumidification wheel, which has air holes passing through each other. Porous ceramic wheel body, which is an open-cell porous three-dimensional network structure with a pore diameter greater than 100 nm, and several micropores are evenly distributed on the surface of the porous ceramic wheel body, so that the dehumidification wheel forms a microporous surface and a porous structure. Porcelain composite adsorption material; the porous ceramic wheel body of the dehumidification wheel has a diameter of 1 to 120 cm, a pore density of 10 to 60 PPI (Pores per inch), a porosity of 60 to 85%, and a bending strength More than 20 kgf / cm ² and thickness between 10 and 100 cm. In the above embodiments of the present invention, the alkaline aqueous solution is sodium hydroxide having a pH between 10 and 14. In the above embodiments of the present invention, the purity of the aluminum hydroxide and the aluminum oxide adsorption material is greater than 99%. In the above embodiment of the present invention, the forming process in step (C) is to adsorb the ceramic slurry to a flammable foamed plastic porous carrier material through extrusion through plastic forming techniques. In the above embodiment of the present invention, the forming process in step (C) is injecting the ceramic slurry into a polymeric foam carrier material having a continuous pore structure by a polymerized foam method. In the above embodiment of the present invention, the polymer foam is made of Polyurethane, polyvinyl chloride, polystyrene, silicone, or cellulose.

Please refer to "Figures 1 to 3", which are schematic diagrams of the manufacturing process of the green environmentally friendly dehumidification wheel of the present invention, the side stereoscopic photo of the green environmentally friendly dehumidification wheel of the present invention, and the frontal stereoscopic photo of the green environmentally friendly dehumidification wheel of the present invention. . As shown in the figure: the present invention is directed to the aluminum smelting industry waste (smelting slag), develops effective materialization regeneration technology and methods, and develops environmentally sustainable environmentally friendly adsorption materials (alumina and alumina) production technology (including purification , Refining and synthesis), recyclable materials of the same grade or upgraded for recycling, and then made into new materials and products, solve the environmental problems derived from waste, increase the life cycle of resources, establish a model of circular economy, and expand the industry benefit. The invention relates to a method for manufacturing a green and environmentally friendly dehumidifying wheel, which uses an environmentally friendly and regenerating adsorption material as a base material to produce a honeycomb runner structure, and then integrates and develops an environmentally friendly and efficient dehumidifying wheel. The method includes at least the following steps: Purification and extraction step s11 of the waste aluminum slag: adding the uncalcined waste aluminum slag to an alkaline aqueous solution, the pH is between 10 and 14, extracting the aluminum element into an aqueous sodium aluminate solution, thereby producing high-purity hydroxide Aluminum and alumina adsorption materials. Slurry preparation step s12: Using the aluminum hydroxide and the aluminum oxide adsorbent as a base material, adding a rheological additive (0.1% to 50%), an anti-foaming agent (0.1% to 30%), and a coagulant (0.1 % ～ 60%) to form ceramic slurry, promote the viscous flow properties of the ceramic slurry and reduce bridging. The molding process step s13: adding the ceramic slurry to a carrier material having a 3D network structure. Drying and sintering step s14: The carrier material is removed by high temperature combustion through a sintering process to obtain a reusable dehumidification wheel. The dehumidification wheel has a porous ceramic wheel body with pores passing through each other, which is an open hole with a pore diameter greater than 100 nm. Type porous three-dimensional network skeleton structure, and several micropores are evenly distributed on the surface of the porous ceramic wheel body, so that the dehumidification wheel forms a composite adsorption material of the microporous surface and the porous ceramic; among them, the porous ceramic wheel body of the dehumidification wheel The diameter is between 1 and 120 cm, the pore density is between 10 and 60 PPI (Pores per inch), the porosity is between 60 and 85%, the flexural strength is greater than 20 kgf / cm ² , and the thickness is between 10 and 100 cm. If so, a new method for manufacturing a green environmental protection dehumidification wheel is constituted by the above-disclosed process. The above-mentioned step s11 of the purification and extraction of waste aluminum slag is an experimental plan for the purification and extraction of high-purity aluminum hydroxide by using the Taguchi-type experimental design method in the aluminum smelting industry to reduce the time required for the adoption of the trial and error method and define the optimal recovery. Rate and separation and purification efficiency operating parameters, accelerate the trial production system verification, and apply to the industry. In the process of purification and extraction of waste aluminum slag, an alkaline aqueous solution must be added to extract the aluminum element to form an aqueous sodium aluminate solution. The amount and concentration of the alkaline aqueous solution will be lost during the purification and extraction process. As long as the water and sodium hydroxide are replenished and adjusted to an appropriate concentration value, you can Recycling reduces waste water treatment requirements and production costs, and the efficiency of separating and purifying aluminum hydroxide adsorption materials is more than 90%, and the purity is greater than 99%. Effective reuse of aluminum slag, materialization into aluminum hydroxide ceramic materials, can reduce waste landfill disposal costs, impact on the environment after landfill, raw material mining and production costs, greenhouse gas emissions, resource consumption And environmental diseconomy, increase resource use efficiency and commercialize green materials technology. After that, the core high-temperature melting process of the Nuclear Energy Research Institute was used as the main technology to develop alumina refining systems, pre-refining treatment and collection technologies to produce high-purity alumina, in order to improve the ownership of raw materials. Multinational corporations monopolized raw materials. The problem of manipulating the price of raw materials in a few large multinational companies effectively broke the bottleneck in the cost of raw materials and created a new page in the ceramic material market. The above-mentioned forming processing step s13 is classified as macroporous ceramics in view of a pore diameter greater than 50 nm. Generally, macroporous ceramics can be formed by plastic forming techniques or polymerized foam methods. The ceramic slurry is adsorbed on a flammable foamed plastic porous carrier through extrusion or the ceramic slurry is injected into a polyurethane foam with a continuous pore structure, and then through the above-mentioned drying and sintering step s14, the carrier material is burned at high temperature. Remove to form large holes (> 100 nm) and regular holes. The organic foaming materials suitable for this molding method are generally polymer foams made by specific foaming technology. The materials are usually polyurethane (polyurethane), polyvinyl chloride, polystyrene, silicone, cellulose, etc. In practical applications, a soft polyurethane foam material is generally used. Because of its low softening temperature, thermal stress damage can be avoided in the volatilization exclusion, thereby preventing the collapse of the pore skeleton of the test body and maintaining the strength of the test body. The pore size of the open organic foaming material determines the pore size of the porous ceramic (usually 5-60 pores / inch), so the appropriate organic foaming material should be selected according to the planned pore size and porosity. The porous ceramic wheel system of the dehumidification wheel obtained by the present invention has an open-cell porous three-dimensional network structure, and the pores are connected to each other. Therefore, the dehumidification wheel can also be used in Molten metal filter materials, gas separation and purification (Hot Gas filtration is used to remove particles from power plant exhaust gas, and porous electrodes and catalyst carriers of solid-state oxidized fuel cells. As shown in Figures 2 and 3, the recycled aluminum hydroxide and alumina adsorption materials are used as the base material, added to the foam carrier with a 3D network structure, and the foam is removed through the sintering process to leave The open-cell porous three-dimensional network skeleton structure, as a porous ceramic wheel structure, has the characteristics of good chemical stability, mechanical strength and high temperature resistance, and has the advantages of no powder, no aging, and repeated cleaning and reuse. In this way, the present invention takes the development of aluminum slag for purification, separation and extraction of environmentally friendly recycled aluminum hydroxide and alumina adsorption materials as the base material, adds it to a 3D mesh structure foam carrier, and removes the foam through a sintering process. A porous ceramic wheel body with a porous porous three-dimensional network structure. The porous ceramic wheel body is used as the main body, and aluminum hydroxide and activated alumina adsorption monomers are added. After high temperature sintering, the surface is hardened and attached to the inside of the macropores. The surface of the ceramic wheel body evenly spreads many micropores, forming a composite adsorption material of the microporous surface and porous ceramics, increasing the contact area with humid air, improving the moisture absorption capacity, and finally integrating the development of a green, environmentally friendly and efficient dehumidification wheel. Therefore, the dehumidification wheel has the following advantages: 1. Good chemical stability; 2. Suitable mechanical strength; 3. High temperature resistant operation; 4. No powder and no aging; 5. Three-dimensional composite porous ceramic flow channel and structure; 6. Millimeter and micron composite porous adsorption channels and structures; 7. Increase the contact area with humid air to increase the moisture absorption capacity; 8. The moisture absorption capacity of the dehumidification wheel is greater than 20%; and 9. The drying capacity of the dehumidification wheel is greater than 200 g / h. To sum up, the present invention is a green environmental protection dehumidification wheel manufacturing method, which can effectively improve the various shortcomings. It aims at the aluminum smelting industry waste (aluminium slag), develops effective materials regeneration technology and methods, and develops environmentally sustainable environmental protection. Production technology (including purification, refining and synthesis) of adsorbent materials (aluminum hydroxide and alumina). Reusable materials are of the same grade or upgraded for recycling, and then made into new materials and products to solve the environment derived from waste Problems, increase the life cycle of resources, establish a paradigm of circular economy, and increase industrial efficiency, so that the production of the invention can be more progressive, more practical, and more in line with the needs of users. File a patent application. However, the above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited by this; therefore, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the invention specification of the present invention , All should still fall within the scope of the invention patent.

s11‧‧‧Purification and extraction steps of waste aluminum residue

s12‧‧‧ slurry preparation step

s13‧‧‧forming processing steps

s14‧‧‧Sintering and sintering steps

Figure 1 is a schematic diagram of the manufacturing process of the green environmental protection dehumidification wheel of the present invention. FIG. 2 is a side view stereo photo of the green environmental protection dehumidification wheel of the present invention. Figure 3 is a front view stereo photo of the green environmental protection dehumidification wheel of the present invention.

Claims (6)

A method for manufacturing a green and environmentally friendly dehumidification wheel includes at least the following steps: (A) the step of purifying and extracting the waste aluminum slag: adding uncalcined waste aluminum slag to an alkaline aqueous solution to extract aluminum into an aqueous sodium aluminate solution, thereby producing high-purity hydrogen Alumina and alumina adsorption materials; (B) Slurry preparation step: The aluminum hydroxide and alumina adsorption materials are used as the base material, and 0.1% to 50% of a rheological additive and 0.1% to 30% of an anti-fat are added. Foaming agent and 0.1% to 60% coagulant form a ceramic slurry, which promotes the viscous flow properties of the ceramic slurry to reduce bridging; (C) Molding process step: adding the ceramic slurry to a carrier material with a 3D network structure (D) Drying and sintering step: The carrier material is removed by high temperature combustion through a sintering process to obtain a reusable dehumidification wheel. The dehumidification wheel has a porous ceramic wheel body with pores passing through each other. A 100-nm open-cell porous three-dimensional network skeleton structure, and several micropores are evenly distributed on the surface of the porous ceramic wheel body, so that the dehumidification wheel forms a composite adsorption material of the microporous surface and the porous ceramic; Porous ceramic wheel of the desiccant wheel diameter between 1 and 120 cm, the pore density is between 10 ~ 60 PPI (Pores per inch ), a porosity of between 60 to 85%, the flexural strength greater than 20 kgf / cm ^2, The thickness is between 10 and 100 cm. The method for manufacturing a green and environmentally friendly dehumidification wheel according to item 1 of the scope of the patent application, wherein the alkaline aqueous solution is sodium hydroxide having a pH of 10-14. According to the manufacturing method of the green and environmentally friendly dehumidification wheel according to item 1 of the scope of the patent application, the purity of the aluminum hydroxide and the aluminum oxide adsorption material is greater than 99%. According to the manufacturing method of the green and environmentally friendly dehumidification wheel according to item 1 of the scope of the patent application, wherein the step (C) forming treatment adopts plastic forming techniques to adsorb the ceramic slurry to flammability through extrusion. Foamed plastic porous carrier material. According to the method for manufacturing a green and environmentally friendly dehumidification wheel according to item 1 of the scope of the patent application, in this step (C), the molding process is to inject the ceramic slurry into a continuous porous structure by a polymerized foam method. Polymer foam carrier material. The method for manufacturing a green and environmentally friendly dehumidification wheel according to item 5 of the scope of the patent application, wherein the polymer foam is polyurethane, polyvinyl chloride, polystyrene, silicone, or cellulose.