WO2024075541A1 - Procédé de production de carbonate de calcium, carbonate de calcium et charge pour fabrication de papier - Google Patents

Procédé de production de carbonate de calcium, carbonate de calcium et charge pour fabrication de papier Download PDF

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Publication number
WO2024075541A1
WO2024075541A1 PCT/JP2023/034383 JP2023034383W WO2024075541A1 WO 2024075541 A1 WO2024075541 A1 WO 2024075541A1 JP 2023034383 W JP2023034383 W JP 2023034383W WO 2024075541 A1 WO2024075541 A1 WO 2024075541A1
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calcium carbonate
calcium
carbonate
hydroxide
calcium hydroxide
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PCT/JP2023/034383
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English (en)
Japanese (ja)
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裕允 阪口
咲也夏 大國
和昂 北
泰徳 南里
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白石工業株式会社
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates

Definitions

  • the present invention relates to a method for producing calcium carbonate using flue gases from combustion furnaces and the like that contain carbon dioxide gas.
  • the present invention also relates to calcium carbonate and a papermaking filler that uses calcium carbonate.
  • Calcium carbonate (CaCO 3 ) is used as a base material or filler for various industrial products, and is also widely used in the fields of agriculture and food.
  • a carbon dioxide gas synthesis method is known in which carbon dioxide gas is blown into milk of lime to carbonate it.
  • flue gas from a lime calcination furnace installed in the vicinity of a calcium carbonate manufacturing plant is often used.
  • exhaust gas from a boiler or a garbage incinerator is also used as a source of carbon dioxide gas.
  • the carbon dioxide gas in the synthesis reaction of calcium carbonate by the carbon dioxide gas synthesis method, the carbon dioxide gas must first be dissolved in water, so the reaction time is long and the reaction efficiency is not high. In order to increase the absorption efficiency of carbon dioxide gas, the reaction is often carried out at low temperatures, so it is not suitable for high temperature reactions. There is also the problem that not all of the carbon dioxide gas is used in the reaction, and the unused carbon dioxide gas is released into the atmosphere.
  • synthesized calcium carbonate is used as an inorganic filler in paper, rubber, sealing materials, plastics, etc.
  • calcium carbonate can be used to fill paper to improve its whiteness and opacity, or added to rubber to improve its mechanical strength and abrasion resistance.
  • Adding calcium carbonate to sealing materials can adjust the viscosity and thixotropy of the sealing materials, and adding calcium carbonate to plastics can improve the mechanical strength and adjust the thermal properties of the plastics. In this way, there are many attempts to create calcium carbonate with the desired particle size, BET specific surface area, and crystal form for various applications.
  • Patent Document 1 discloses a method for simultaneously obtaining aragonite crystalline calcium carbonate, which is useful as a filler or pigment, and an aqueous solution of sodium hydroxide through a causticizing reaction.
  • Patent Document 2 discloses a method for producing spindle-shaped or columnar calcium carbonate by absorbing carbon dioxide gas into an aqueous solution of caustic soda (sodium hydroxide) to produce sodium carbonate, and then reacting the sodium carbonate with milk of lime (aqueous calcium hydroxide dispersion).
  • caustic soda sodium hydroxide
  • Patent Document 1 natural or synthetic soda ash is dissolved in water to obtain an aqueous sodium carbonate solution, and the use of carbon dioxide emitted from exhaust gases, etc. is not taught.
  • milk of lime is made by mixing slaked lime and a 1 mole/liter aqueous sodium hydroxide solution in a ratio that results in a quicklime concentration of 10% by mass, and that a causticizing reaction is carried out using an aqueous sodium carbonate solution (1.6 moles/liter) as the sodium carbonate source at an addition rate of 0.02 g [sodium carbonate]/min/g [calcium oxide] (0.01 mole [sodium carbonate]/min/mol [calcium oxide]), at a temperature of 50°C, and at a stirring speed of 400 rpm, and needle-shaped calcium carbonate of aragonite crystals is observed.
  • the calcium carbonate manufacturing method in Patent Document 2 includes a step of absorbing combustion gases, etc., into a caustic soda solution (sodium hydroxide solution), but the relationship between the particle size, crystal form, and shape of the calcium carbonate obtained by this manufacturing method and the manufacturing method is not necessarily clear.
  • the present invention aims to produce calcium carbonate with a controlled morphology while efficiently utilizing carbon dioxide contained in exhaust gases and the like that are to be discharged into the atmosphere. Specifically, the present invention aims to efficiently produce aragonite crystalline calcium carbonate.
  • the present invention relates to a method for producing a method for manufacturing a semiconductor device comprising the steps of: a carbon dioxide gas absorption step of introducing a gas containing carbon dioxide gas into the aqueous sodium hydroxide solution to obtain an aqueous sodium carbonate solution; a hydration step of reacting calcium oxide with an aqueous sodium hydroxide solution having a concentration of less than 0-6% by mass to obtain a calcium hydroxide aqueous dispersion; a carbonation step of adding the aqueous sodium carbonate solution to the calcium hydroxide aqueous dispersion so that the addition rate of sodium carbonate per 1 mole of calcium hydroxide in the calcium hydroxide aqueous dispersion is 0.25 moles/minute or less to obtain calcium carbonate;
  • the present invention relates to a method for producing calcium carbonate having a BET specific surface area of 2.0 to 15.0 m 2 /g and containing aragonite-based calcium carbonate as a main component.
  • the concentration of each component it is preferable to adjust the concentration of each component so that the calcium hydroxide concentration in the calcium hydroxide water dispersion is 10% by mass to 23% by mass, and the sodium hydroxide concentration is 4% by mass or more.
  • the present invention relates to calcium carbonate containing aragonite-based calcium carbonate as a main component, which is produced by the above-mentioned production method and has a BET specific surface area of 2.0 to 15.0 m 2 /g.
  • the present invention also relates to a papermaking filler containing the above calcium carbonate.
  • the present invention by preparing the aqueous sodium carbonate solution and sodium hydroxide in the process at higher concentrations than in the conventional method, by using a calcium hydroxide aqueous dispersion at a higher concentration than in the conventional method, and by relatively accelerating the rate of addition of sodium carbonate per mole of calcium hydroxide in the calcium hydroxide aqueous dispersion, it is possible to efficiently and continuously obtain calcium carbonate in the desired aragonite crystal form.
  • the calcium carbonate obtained by the method of the present invention can be used as an additive to sealants, adhesives, inks, and various plastic materials, and is particularly suitable for papermaking applications.
  • FIG. 1 is a flow diagram illustrating the production method of the present invention.
  • FIG. 2 is an electron microscope photograph (magnification: 10,000 times) of the aragonite crystalline calcium carbonate obtained in Example 2.
  • FIG. 3 is an electron microscope photograph (magnification: 10,000 times) of the aragonite crystalline calcium carbonate obtained in Example 3.
  • FIG. 4 is an electron microscope photograph (magnification: 10,000 times) of the aragonite crystalline calcium carbonate obtained in Comparative Example 1.
  • FIG. 5 is a graph showing the relationship between the time of addition of an aqueous sodium carbonate solution to a calcium hydroxide water dispersion in the carbonation step and the BET specific surface area and the proportion of aragonite crystals (aragonite content) of the produced calcium carbonate.
  • One embodiment of the present invention is a process for producing a method for producing a polymeric material comprising the steps of: a carbon dioxide gas absorption step of introducing a gas containing carbon dioxide gas into the aqueous sodium hydroxide solution to obtain an aqueous sodium carbonate solution; a hydration step of reacting calcium oxide with an aqueous sodium hydroxide solution having a concentration of less than 0-6% by mass to obtain a calcium hydroxide aqueous dispersion; a carbonation step of adding the aqueous sodium carbonate solution to the calcium hydroxide aqueous dispersion so that the addition rate of sodium carbonate per 1 mole of calcium hydroxide in the calcium hydroxide aqueous dispersion is 0.25 moles/minute or less to obtain calcium carbonate;
  • the present invention relates to a method for producing calcium carbonate having a BET specific surface area of 2.0 to 15.0 m 2 /g and containing aragonite-based calcium carbonate as a main component.
  • calcium carbonate is a calcium carbonate represented by the composition formula CaCO3 , and is a main component of seashells, eggshells, limestone, chalk, etc.
  • Calcium carbonate is classified into heavy calcium carbonate (natural calcium carbonate) obtained by crushing and classifying limestone, and light calcium carbonate (synthetic calcium carbonate) obtained by chemical reaction, but the calcium carbonate used in this embodiment is light calcium carbonate. Therefore, when simply saying calcium carbonate in this specification, it means light calcium carbonate (synthetic calcium carbonate) unless otherwise specified.
  • Calcium carbonate has crystal forms such as calcite crystals (trigonal rhombohedral crystals), aragonite crystals (rectangular crystals), and vaterite crystals (hexagonal crystals), and in one embodiment, calcium carbonate containing calcium carbonate having an aragonite crystal form (referred to as "aragonite calcium carbonate” in this specification) as a main component can be produced.
  • "aragonite calcium carbonate as a main component” refers to calcium carbonate in which approximately 98% or more, preferably 99% or more, of the total mass of calcium carbonate is aragonite calcium carbonate.
  • the aragonite calcium carbonate preferably has an aspect ratio of primary particles of approximately 2 or more.
  • the aspect ratio refers to the aspect ratio of the primary particles of calcium carbonate, that is, the ratio of the major axis to the minor axis of the primary particles of calcium carbonate.
  • the aspect ratio of calcium carbonate can be measured with an electron microscope. Specifically, it can be calculated by image analysis based on observation using an electron microscope.
  • the aspect ratio of calcium carbonate produced is 2 to 10, preferably 2.5 to 8.
  • One embodiment is a method for producing calcium carbonate, which includes at least a carbon dioxide gas absorption step, a hydration step, and a carbonation step.
  • the carbon dioxide gas absorption step is a step in which carbon dioxide gas (carbon dioxide, CO 2 ) is absorbed in an aqueous solution of sodium hydroxide (NaOH) to obtain an aqueous solution of sodium carbonate (Na 2 CO 3 ).
  • Sodium hydroxide is generally called caustic soda, and a commercially available product can be used as appropriate.
  • the aqueous solution of sodium hydroxide can be obtained by dissolving sodium hydroxide in water, or a liquid containing sodium hydroxide obtained in a papermaking process (so-called "white liquor”) can be used.
  • the hydration step is a step of reacting calcium oxide (CaO) with an aqueous sodium hydroxide solution having a concentration of less than 0-6% by mass to obtain milk of lime, which is an aqueous dispersion of calcium hydroxide (CaCO 3 ).
  • Milk of lime is an aqueous suspension of calcium hydroxide (sometimes referred to as an "aqueous calcium hydroxide dispersion" or an "aqueous calcium hydroxide slurry”).
  • the calcium oxide used in the hydration step is an oxide of calcium, also commonly called quicklime. As calcium oxide, commercially available calcium oxide can be used as appropriate.
  • the concentration of the aqueous sodium hydroxide solution reacted with calcium oxide in this step is less than 0-6% by mass.
  • the calcium hydroxide obtained in this step is a hydroxide salt of calcium, also commonly called slaked lime.
  • the hydration process and the carbon dioxide gas absorption process can be carried out simultaneously in parallel, or they can be carried out successively, such as the carbon dioxide gas absorption process followed by the hydration process, or the hydration process followed by the carbon dioxide gas absorption process.
  • the carbonation step is a step of obtaining calcium carbonate (CaCO 3 ) by reacting the calcium hydroxide water dispersion (hereinafter, sometimes referred to as "lime milk") obtained in the hydration step with the sodium carbonate aqueous solution obtained in the carbon dioxide gas absorption step.
  • This step is also generally called the causticization step.
  • the carbonation step in order to adjust the rate of addition of sodium carbonate per mole of calcium hydroxide in the calcium hydroxide water dispersion and produce calcium carbonate containing aragonite-type calcium carbonate as a main component in one embodiment, it is preferable to further include an adjustment step of adjusting the concentrations of calcium hydroxide and sodium hydroxide in the calcium hydroxide water dispersion after the hydration step.
  • the adjustment step it is preferable to adjust the solid content concentration of calcium hydroxide in the calcium hydroxide water dispersion to 10-23 mass%, and the concentration of sodium hydroxide to 4 mass% or more.
  • the concentration of the calcium hydroxide water dispersion obtained in the hydration step can be adjusted by adding solid sodium hydroxide to the calcium hydroxide water dispersion.
  • the solid content concentration of calcium hydroxide in the calcium hydroxide water dispersion in this way it is possible to easily adjust the rate of addition of sodium carbonate per mole of calcium hydroxide in the calcium hydroxide water dispersion in the carbonation step.
  • the addition rate of sodium carbonate per mole of calcium hydroxide in the calcium hydroxide aqueous dispersion can be set to 0.25 moles/minute or less.
  • the aqueous sodium carbonate solution when the aqueous sodium carbonate solution is added to the calcium hydroxide water dispersion whose concentration has been adjusted to the above range, the aqueous sodium carbonate solution is added so that the molar ratio of the amount of sodium carbonate present in the aqueous sodium carbonate solution to the amount of calcium hydroxide present in the calcium hydroxide water dispersion is 0.9-1.5. It is preferable to add the aqueous sodium carbonate solution obtained in the carbon dioxide gas absorption process, the concentration of which has been adjusted as necessary, to the calcium hydroxide water dispersion whose concentration has been adjusted, and react at a temperature of 40-80°C or 45-65°C.
  • reaction temperature in the carbonation process is too high or too low, the cost required for energy required for heating and cooling increases. Note that if the reaction temperature in the carbonation process is increased, the shape of the obtained aragonite-based calcium carbonate (needle-like) tends to become thicker.
  • the reaction in the carbonation process is preferably carried out by stirring the reaction liquid.
  • the stirrer can be adjusted so that the time required for completely mixing the aqueous sodium carbonate solution (complete mixing time) when the aqueous sodium carbonate solution is gradually added to the calcium hydroxide water dispersion at the above speed is 3-25 seconds, or 5-22 seconds.
  • FIG. 1 shows the flow of the production method of one embodiment.
  • 1 is a carbon dioxide gas absorption process
  • 2 is a hydration process
  • 3 is a carbonation process.
  • the calcium carbonate produced in one embodiment has a BET specific surface area of 2.0 to 15.0 m 2 /g, preferably 3.0 to 8.0 m 2 /g.
  • the BET specific surface area can be measured according to Japanese Industrial Standard JIS Z 8830 "Method for measuring specific surface area of powder (solid) by gas adsorption".
  • the calcium carbonate of the second embodiment which has a BET specific surface area of 2.0 to 15.0 m 2 /g and contains aragonite calcium carbonate as a main component.
  • the calcium carbonate of the second embodiment produced in the first embodiment preferably has an average particle size [D 50 ] of 5.0 to 12.0 ⁇ m based on the number measured by a laser diffraction type particle size measuring device.
  • the average particle size [D 50 ] can be calculated based on the number measured by a laser diffraction type particle size measuring device.
  • the average particle size [D 50 ] refers to the size of higher order particles formed by aggregation of primary particles of calcium carbonate.
  • the calcium carbonate of the second embodiment preferably has an aragonite calcium carbonate content of 99 mass% or more.
  • the surface of the calcium carbonate of the second embodiment can be treated and used as surface-treated calcium carbonate.
  • surface-treated calcium carbonate refers to a state in which the surface of the calcium carbonate is covered with a surface treatment agent, or at least a state in which the surface treatment agent is attached to the surface of the calcium carbonate.
  • the surface coverage rate of the surface treatment agent per unit BET specific surface area of the calcium carbonate i.e.
  • the surface treatment amount can be measured from the weight loss after heating (heat loss), and can be measured, for example, by the following method: a specified amount of surface-treated calcium carbonate is weighed out, heated from room temperature using a thermogravimetric analyzer (TG) or the like, and the weight is measured when the temperature reaches 200° C. and when the temperature reaches 500° C.
  • TG thermogravimetric analyzer
  • Heat loss ratio [%] [ ⁇ (weight [g] of sample at 200°C) - (weight [g] of sample at 500°C) ⁇ / (weight [g] of sample at 200°C)] ⁇ 100
  • the heat loss ratio of the surface-treated calcium carbonate is calculated by the above and divided by the BET specific surface area described above to obtain the surface coverage ratio of the surface-treated calcium carbonate.
  • the surface treatment of calcium carbonate can be carried out, for example, using a surface treatment agent containing a substance selected from the group consisting of fatty acids and derivatives thereof, resin acids and derivatives thereof, silica, organosilicon compounds, condensed phosphoric acid, and condensed phosphates.
  • a surface treatment agent containing a substance selected from the group consisting of fatty acids and derivatives thereof, resin acids and derivatives thereof, silica, organosilicon compounds, condensed phosphoric acid, and condensed phosphates it is particularly preferable that the surface is treated using a surface treatment agent containing a metal salt of a fatty acid, in particular a fatty acid sodium salt or a fatty acid potassium salt.
  • the fatty acid include saturated and unsaturated fatty acids having 6 to 24 carbon atoms, preferably 10 to 20 carbon atoms.
  • fatty acids examples include hexanoic acid (caproic acid), heptanoic acid (enanthic acid), octanoic acid (caprylic acid), nonanoic acid (pelargonic acid), decanoic acid (capric acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), pentadecanoic acid (pentadecylic acid), hexadecanoic acid (palmitic acid), heptadecanoic acid (margaric acid), octadecanoic acid (stearic acid), icosanoic acid (arachidic acid), docosanoic acid (behenic acid), tetracosanoic acid, oleic acid, linoleic acid, linolenic acid, arachidonic acid, eicosapentaenoic acid, docosahexaenoic acid, myristoleic acid,
  • the surface-treated calcium carbonate is preferably surface-treated so that the surface coverage by the surface treatment agent per unit BET specific surface area of calcium carbonate is 0.15-0.60 [%/(m 2 /g)], preferably 0.20-0.45 [%/(m 2 /g)], and more preferably 0.25-0.40 [%/(m 2 /g)].
  • the surface treatment of calcium carbonate can be carried out by any known method, for example, by adding at least one of the above-mentioned fatty acids to a slurry containing calcium carbonate and water, followed by dehydration and drying (wet method).
  • wet method for surface treating calcium carbonate with an alkali metal salt of a fatty acid.
  • a fatty acid is heated in an aqueous solution of an alkali metal such as an aqueous solution of sodium hydroxide or an aqueous solution of potassium hydroxide to obtain an aqueous solution of a fatty acid alkali metal salt.
  • an alkali metal such as an aqueous solution of sodium hydroxide or an aqueous solution of potassium hydroxide
  • the aqueous solution of a fatty acid alkali metal salt is added to a slurry of calcium carbonate and water, and the mixture is stirred. This allows the fatty acid alkali metal salt to adhere to the surface of the calcium carbonate.
  • the content of the solid content of calcium carbonate in the slurry of calcium carbonate and water may be appropriately adjusted in consideration of the average particle size of calcium carbonate, the dispersibility of calcium carbonate in the slurry, the ease of dehydration of the slurry, and the like.
  • the solid content of the slurry may be adjusted to about 2 to 30 mass%, preferably about 5 to 20 mass%, a slurry with an appropriate viscosity can be obtained, which makes it possible to appropriately perform the surface treatment of calcium carbonate.
  • the solid content of the calcium carbonate water slurry, the concentration of the fatty acid alkali metal salt, the stirring time, the stirring speed, and the like can be adjusted so that the surface coverage rate of the calcium carbonate by the surface treatment agent per unit BET specific surface area is 0.15 to 0.60 [%/(m 2 /g)].
  • the calcium carbonate water slurry whose surface has been treated with a fatty acid alkali metal salt can be dehydrated, for example, by a method such as a filter press. Drying can be performed, for example, by using a box dryer. In this way, the calcium carbonate of the second embodiment can be surface-treated as necessary for use as the papermaking filler of the third embodiment.
  • the calcium carbonate of the second embodiment can be preferably used as a papermaking filler. Therefore, the third embodiment is a papermaking filler containing the above calcium carbonate. To use the calcium carbonate of the second embodiment as a papermaking filler, it is preferable to use it as is without carrying out the above-mentioned surface treatment.
  • Example 1 Carbon dioxide gas absorption step A carbon dioxide-air mixed gas containing 30% by volume of carbon dioxide gas was introduced into a 12.9% by mass aqueous sodium hydroxide solution until the pH of the aqueous solution reached 11.5. 644 kg of a 14.8% by mass aqueous sodium carbonate solution was obtained.
  • FIG. 2 is an electron microscope photograph (magnification 10,000 times) of the calcium carbonate obtained in Example 1.
  • the calcium carbonate had a BET specific surface area (measured according to JIS Z 8830) of 7.4 m 2 /g, and an aragonite content measured by an XRD method of 99.6%.
  • Example 2 Example 1 was repeated, except that in the carbonation step of Example 1, 630 kg of sodium carbonate aqueous solution was added to the calcium hydroxide aqueous dispersion over 15 minutes (the rate of sodium carbonate added per mole of calcium hydroxide in the calcium hydroxide aqueous dispersion was 0.08 mole/min). 79 kg of calcium carbonate powder was obtained. When the obtained calcium carbonate was observed under an electron microscope, it was found to be aragonite having a needle-like shape.
  • FIG. 3 is an electron microscope photograph (magnification 10,000 times) of the calcium carbonate obtained in Example 2.
  • Example 3 The BET specific surface area (measured according to JIS Z 8830) of this calcium carbonate was 7.9 m 2 /g, and the aragonite content measured by the XRD method was 99.4%.
  • Example 3 Example 1 was repeated, except that in the carbonation step of Example 1, 630 kg of sodium carbonate aqueous solution was added to the calcium hydroxide aqueous dispersion over 10 minutes (the addition rate of sodium carbonate per mole of calcium hydroxide in the calcium hydroxide aqueous dispersion was 0.12 moles/minute). 79 kg of calcium carbonate powder was obtained. When the obtained calcium carbonate was observed under an electron microscope, it was found to be aragonite having a needle-like shape.
  • Example 4 The BET specific surface area of this calcium carbonate (measured according to JIS Z 8830) was 3.9 m2 /g, and the aragonite content measured by the XRD method was 100%.
  • Example 4 Example 1 was repeated, except that in the carbonation step of Example 1, 630 kg of sodium carbonate aqueous solution was added to the calcium hydroxide aqueous dispersion over 5 minutes (the rate of sodium carbonate added per mole of calcium hydroxide in the calcium hydroxide aqueous dispersion was 0.24 moles/minute). 79 kg of calcium carbonate powder was obtained. When the obtained calcium carbonate was observed under an electron microscope, it was found to be aragonite having a needle-like shape.
  • Example 1 The BET specific surface area of this calcium carbonate (measured according to JIS Z 8830) was 5.0 m2 /g, and the aragonite content measured by the XRD method was 100%.
  • Example 1 was repeated, except that in the carbonation step of Example 1, 630 kg of sodium carbonate aqueous solution was added to the calcium hydroxide aqueous dispersion over 1/6 minute (10 seconds) (the rate of sodium carbonate added per mole of calcium hydroxide in the calcium hydroxide aqueous dispersion was 7.2 moles/minute). 79 kg of calcium carbonate powder was obtained.
  • FIG. 4 is an electron microscope photograph (magnification 10,000 times) of the calcium carbonate obtained in Comparative Example 1.
  • Example 2 Example 1 was repeated, except that the concentration of the calcium hydroxide aqueous dispersion (lime milk) obtained in the hydration step was adjusted to 15.0 mass% solids concentration and 3.3 mass% sodium hydroxide concentration (the rate of sodium carbonate addition per mole of calcium hydroxide in the calcium hydroxide aqueous dispersion was 0.01 mole/min).
  • the calcium carbonate obtained was observed under an electron microscope and found to contain aragonite-based calcium carbonate.
  • the BET specific surface area of this calcium carbonate (measured according to JIS Z 8830) was 10.7 m 2 /g, and the aragonite content measured by the XRD method was 97.1%.
  • Example 3 In the hydration step of Example 1, a 6.5% by mass aqueous solution of sodium hydroxide was used instead of water, but the resulting calcium hydroxide aqueous dispersion (milk of lime) had high viscosity and could not be advanced to the next step.
  • Figure 5 is a graph showing the relationship between the time of adding the aqueous sodium carbonate solution to the calcium hydroxide water dispersion in the carbonation process and the BET specific surface area and aragonite content of the produced calcium carbonate.
  • the aragonite content increases as the addition rate of sodium carbonate per mole of calcium hydroxide in the calcium hydroxide water dispersion decreases, and the aragonite content decreases when the rate exceeds approximately 0.25 moles/minute.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

Le but de la présente invention est de produire efficacement du carbonate de calcium cristallin d'aragonite tout en utilisant efficacement le dioxyde de carbone contenu dans le gaz d'échappement, etc. qui est évacué dans l'atmosphère.　La présente invention concerne un procédé de production de carbonate de calcium contenant comme composant principal du carbonate de calcium d'aragonite ayant une surface spécifique BET de 2,0 à 15,0 m2/g. Ledit procédé comprend les étapes suivantes : une étape d'absorption de dioxyde de carbone qui introduit du gaz contenant du dioxyde de carbone dans une solution aqueuse d'hydroxyde de sodium pour obtenir une solution aqueuse de carbonate de sodium ; une étape d'hydratation qui fait réagir de l'oxyde de calcium et une solution aqueuse d'hydroxyde de sodium ayant une concentration de 0 à moins de 6 % en masse pour obtenir une dispersion aqueuse d'hydroxyde de calcium ; et une étape de carbonatation qui ajoute la solution aqueuse de carbonate de sodium à la dispersion aqueuse d'hydroxyde de calcium, de telle sorte que le taux d'addition de carbonate de sodium soit de 0,25 mol/min ou moins par mole d'hydroxyde de calcium dans la dispersion aqueuse d'hydroxyde de calcium, pour obtenir du carbonate de calcium.
PCT/JP2023/034383 2022-10-07 2023-09-22 Procédé de production de carbonate de calcium, carbonate de calcium et charge pour fabrication de papier WO2024075541A1 (fr)

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WO2007078018A1 (fr) * 2005-12-31 2007-07-12 Korea Institute Of Geoscience And Mineral Resources Procede de fabrication de carbonate de calcium precipite d'aragonite a phase simple
JP6970469B1 (ja) * 2020-12-28 2021-11-24 白石工業株式会社 炭酸カルシウムの製造方法
JP7089311B1 (ja) * 2021-11-05 2022-06-22 白石工業株式会社 炭酸カルシウムの製造方法
JP7104446B1 (ja) * 2021-12-06 2022-07-21 白石工業株式会社 表面処理炭酸カルシウムおよびそれを含む樹脂組成物
CN115072757A (zh) * 2022-06-27 2022-09-20 山西石器时代新材料科技有限公司 一种微细棒状文石型碳酸钙及其制备方法
CN115092948A (zh) * 2022-06-27 2022-09-23 山西石器时代新材料科技有限公司 一种利用烟气制备微细棒状文石型碳酸钙及其制备方法

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WO2007078017A1 (fr) * 2005-12-31 2007-07-12 Korea Institute Of Geoscience And Mineral Resources Nouveau procede de fabrication de carbonate de calcium sous forme d'aragonite

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001199720A (ja) * 2000-01-18 2001-07-24 Nippon Paper Industries Co Ltd 炭酸カルシウムの製造方法
JP2002293537A (ja) * 2001-04-02 2002-10-09 Okutama Kogyo Co Ltd 炭酸カルシウムの製造方法
WO2007078018A1 (fr) * 2005-12-31 2007-07-12 Korea Institute Of Geoscience And Mineral Resources Procede de fabrication de carbonate de calcium precipite d'aragonite a phase simple
JP6970469B1 (ja) * 2020-12-28 2021-11-24 白石工業株式会社 炭酸カルシウムの製造方法
JP7089311B1 (ja) * 2021-11-05 2022-06-22 白石工業株式会社 炭酸カルシウムの製造方法
JP7104446B1 (ja) * 2021-12-06 2022-07-21 白石工業株式会社 表面処理炭酸カルシウムおよびそれを含む樹脂組成物
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