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KR-20260063547-A - METHOD FOR MANUFACTURING SEAWATER MAGNESIA CLINKER

KR20260063547AKR 20260063547 AKR20260063547 AKR 20260063547AKR-20260063547-A

Abstract

The present embodiments relate to a method for manufacturing seawater magnesia clinker. A method for manufacturing seawater magnesia clinker according to one embodiment may include the steps of: preparing a synthetic magnesium hydroxide (Mg(OH) ₂ ) slurry using seawater and limestone; drying the slurry; adding a fluorine-containing additive to the dried slurry and kneading it to produce a mixture; molding the mixture to produce a molded body; and firing the molded body.

Inventors

  • 임윤탁

Assignees

  • (주)포스코퓨처엠

Dates

Publication Date
20260507
Application Date
20241030

Claims (11)

  1. A step of preparing a synthetic magnesium hydroxide (Mg(OH) ₂ ) slurry using seawater and limestone; A step of drying the above slurry; A step of preparing a mixture by adding a fluorine-containing additive to the above-mentioned dried slurry and then kneading it; A step of manufacturing a molded body by molding the above mixture; and Step of firing the above-mentioned molded body; including, Method for manufacturing seawater magnesia clinker.
  2. In paragraph 1, A method for producing seawater magnesia clinker , wherein the above-mentioned fluorine-containing additive comprises at least one of Na₂SiF₆ , SiF₄ , and C₆H₁₃F₃O₃Si .
  3. In paragraph 1, A method for manufacturing seawater magnesia clinker, wherein the content of the above-mentioned fluorine-containing additive is in the range of 0.01% to 5% by weight based on 100% by weight of the above-mentioned mixture.
  4. In paragraph 1, A method for manufacturing seawater magnesia clinker, wherein the content of the above-mentioned fluorine-containing additive is in the range of 0.05% to 2% by weight based on the above-mentioned mixture.
  5. In paragraph 1, A method for manufacturing seawater magnesia clinker, wherein the content of boron-containing impurities is 0.17 weight% or less based on the total seawater magnesia clinker.
  6. In paragraph 1, A method for manufacturing seawater magnesia clinker, wherein the step of drying the above slurry is performed at 80 to 200°C.
  7. In paragraph 1, A method for manufacturing seawater magnesia clinker, wherein the step of manufacturing the above-mentioned molded body is performed under pressure conditions of 0.5 to 1.5 ton/cm².
  8. In paragraph 1, A method for manufacturing seawater magnesia clinker, wherein the step of firing the above-mentioned molded body is performed at 1,600 to 2,000°C.
  9. In paragraph 1, A method for manufacturing seawater magnesia clinker, wherein the porosity of the seawater magnesia clinker is in the range of 2.4 to 2.6%.
  10. In paragraph 1, A method for manufacturing seawater magnesia clinker, wherein the density of the seawater magnesia clinker is in the range of 3.1 to 3.6 g/cm³.
  11. In paragraph 1, A method for producing seawater magnesia clinker, wherein the MgO content is 97 weight% or more based on the total seawater magnesia clinker.

Description

Method for manufacturing seawater magnesium clinker These embodiments relate to a method for manufacturing seawater magnesia clinker. Magnesia (MgO) is a primary raw material for basic refractories. This magnesia can be divided into natural sintered magnesia, obtained by starting from natural ore (magnesite) and dead burning at high temperatures, and synthetic seawater magnesia, obtained by extracting Mg²⁺ present in seawater, synthesizing it, and then calcining it. Among these, natural sintered magnesia has a high dependence on China, so recently, interest has been focused on developing technology to manufacture seawater magnesia as a way to reduce dependence on China for refractory raw materials. However, seawater inevitably contains various impurities, which negatively affect the quality of synthetic magnesia clinker. When seawater magnesia with a high content of impurities, particularly boron, is used as a raw material for refractories, there are problems such as excessive sintering, shrinkage, and fusion with the base refractory material, which limit its usage. Accordingly, methods such as using ion adsorption technology to reduce impurities containing boron during seawater magnesia production or adding an excess amount of Ca(OH) ₂ when Mg(OH) ₂ is produced have been proposed. However, all of these methods require high-cost equipment investment and incur excessive maintenance costs during plant operation, which increases production costs and significantly reduces economic feasibility. Therefore, there is a need to develop technology to manufacture seawater magnesia with reduced boron-containing impurity content without the need for large-scale facilities. Terms such as first, second, and third are used to describe various parts, components, regions, layers, and/or sections, but are not limited thereto. These terms are used solely to distinguish one part, component, region, layer, or section from another part, component, region, layer, or section. Accordingly, the first part, component, region, layer, or section described below may be referred to as the second part, component, region, layer, or section without departing from the scope of the present invention. The technical terms used herein are for the reference of specific embodiments only and are not intended to limit the invention. The singular forms used herein include plural forms unless phrases clearly indicate otherwise. As used in the specification, the meaning of "comprising" specifies certain characteristics, areas, integers, steps, actions, elements, and/or components, and does not exclude the presence or addition of other characteristics, areas, integers, steps, actions, elements, and/or components. When it is stated that one part is "above" or "on" another part, it may be directly above or on the other part, or other parts may be involved in between. In contrast, when it is stated that one part is "directly above" another part, no other parts are interposed in between. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with relevant technical literature and the present disclosure, and are not interpreted in an ideal or highly formal sense unless otherwise defined. Also, unless otherwise specified, % means weight %, and 1 ppm is 0.0001 weight %. In this specification, the term “combination(s) of these” described in the Markush-type expression means one or more mixtures or combinations selected from the group consisting of the components described in the Markush-type expression, and means including any one or more selected from the group consisting of said components. Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Method for manufacturing seawater magnesia clinker A method for manufacturing a seawater magnesia clinker according to one embodiment may include the steps of: preparing a synthetic magnesium hydroxide (Mg(OH) ₂ ) slurry using seawater and limestone; drying the slurry; adding a fluorine-containing additive to the dried slurry and kneading it to produce a mixture; molding the mixture to produce a molded body; and firing the molded body. First, a synthetic magnesium hydroxide slurry (Mg(OH) ₂ ) is prepared using seawater and limestone. This synthetic magnesium slurry is obtained by reacting carbonated seawater with a quicklime [Ca(OH) ₂ ] slurry, and since this is obvious to a person skilled in the art, a detailed explanation thereof is omitted. Next, the step of drying the above slurry is performed. It is desirable to manage the drying so that the moisture content is abou