Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2/00—Lime, magnesia or dolomite
  • C04B2/02—Lime
  • C04B2/04—Slaking
  • C04B2/06—Slaking with addition of substances, e.g. hydrophobic agents ; Slaking in the presence of other compounds
• • 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
  • C01F11/02—Oxides or hydroxides
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2004/00—Particle morphology
  • C01P2004/01—Particle morphology depicted by an image
  • C01P2004/03—Particle morphology depicted by an image obtained by SEM
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2004/00—Particle morphology
  • C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2004/00—Particle morphology
  • C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
  • C01P2004/22—Particle morphology extending in two dimensions, e.g. plate-like with a polygonal circumferential shape
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2004/00—Particle morphology
  • C01P2004/54—Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2004/00—Particle morphology
  • C01P2004/60—Particles characterised by their size
  • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2006/00—Physical properties of inorganic compounds
  • C01P2006/80—Compositional purity
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]

Definitions

• the present invention relates to slaked lime compositions comprising Ca (OH) 2 particles of platelet crystalline morphology, called platelets, said platelets having a circle diameter circumscribed to the wafer and a thickness, as well as a form factor. consisting of the ratio between said circle diameter circumscribing the wafer and said thickness.
• the slaked lime consists of a set of solid particles, mainly calcium dihydroxide Ca (OH) 2 , which is the industrial result of hydration or extinction of quicklime with water. It is also called hydrated lime. Subsequently, the calcium dihydroxide will be named simply "calcium hydroxide".
• Lime means a mineral solid material whose chemical composition is mainly calcium oxide CaO.
• Quicklime is commonly obtained by calcareous firing, mainly consisting of CaCOs.
• Quicklime contains impurities, that is, compounds such as magnesium oxide MgO, silica SiO 2 or alumina Al 2 O 3, etc., up to a few percent. It is understood that these impurities are expressed in the aforementioned forms but may actually appear in different phases.
• quicklime also contains sulfur compounds; sulfur is usually present in quicklime at 0.01% to 0.2% by weight.
• a dry mode of extinction the amount of water added is limited to that required for the quenching reaction, increased by that lost to water vapor due to the exothermic nature of the reaction; the product obtained is powdery.
• a "wet” quench mode the amount of water added is in substantial excess over the amount strictly necessary for the quenching reaction.
• a "lime milk” is thus obtained, namely an aqueous suspension of slaked lime particles.
• the product obtained is pasty and one speaks of extinction "by pasty way" (Lime putty, in English).
• the slaked lime obtained can obviously contain the impurities, resulting from quicklime, mentioned above.
• the hydration reaction is controlled by a CaO-reprecipitation mechanism of Ca (OH) 2 , limited by the diffusion of water within the CaO solid material.
• the lime particles dissolve at the surface, at the most active sites leading to the formation of Ca (OH) 2 .
• This reaction is accompanied by an increase in volume and a release of heat.
• the quicklime particles are then placed under stress, crack, leaving wide access to the water of hydration to continue the reaction. The reaction stops when all the lime has been converted to calcium hydroxide or when all the water in the system has been consumed.
• the kinetics of the hydration reaction of quicklime is clearly dependent on the reactivity of the quicklime.
• Quicklime resulting from soft cooking will have a high porosity and will have a large contact area with extinguishing water.
• the hydration reaction is very fast, often called explosive.
• the The temperature can rise above 100 ° C. and lead to a reaction in the vapor phase.
• the contact surface between lime and water is limited because the porosity of these lime is more closed and therefore the hydration reaction is slower.
• the slaked lime is presented as a set of disordered agglomerates of Ca (OH) 2 crystals of very small size, having any morphology random and sometimes described as amorphous.
• calcium hydroxides mainly composed of particles of defined morphology, in particular in the form of platelets, instead of agglomerates. of Ca (OH) 2 random morphology, usually encountered.
• Synthetic calcium hydroxides obtained from sodium hydroxide and calcium chloride whose crystals are in the form of platelets are known (see, for example, Yasue et al (Gypsum and Lime, 1984) and Yilmaz et al. Journal of Materials Science Letters, 1991)). These synthetic calcium hydroxide crystals lead to specific products that are not lime crystals. Among others, Yilmaz et al refers to a composition of cement and the effect of the SMF superplasticizer on the morphology and crystallization of portlandite.
• EP 0152008 discloses an aqueous slurry in which there is calcium sulfate and an organic substance, particularly an oxycarbonic acid to retard the extinction of quicklime.
• an organic substance particularly an oxycarbonic acid to retard the extinction of quicklime.
• crystals in the form of platelets there is no mention of crystals in the form of platelets.
• US 5,332,436 discloses extinguishing reaction modifying chemicals such as ethanolamine, ethylene glycol and derivatives thereof (see column 2, line 54 to column 3 line 5). There is also mention of the use of diethylene glycol (DEG). These chemical agents delay the quenching reaction. No mineral additives are added. In addition, crystallization in the form of platelets is disclosed in order to increase the specific surface area of the resulting slaked lime. The level of platelets with respect to agglomerates of any morphology is not specified; their thickness is not disclosed.
• DEG diethylene glycol
• BE 1017305 relates to particles of calcium hydroxide and / or magnesium with very high reactivity, characterized in that they have an X-ray diffraction line typical of slaked lime, of intensity less than 50%, preferably less than 20% (reduction of at least 75%) of the intensity of a traditional hydrated lime, a sign of low crystallization, an X-ray diffraction line being all the more intense as the crystallization is high.
• preferably at least 50% by weight, advantageously at least 75% or 85% by weight of the particles is in the form of micelles very weakly crystallized.
• this slaked lime is prepared by simply reacting a ground quicklime with a quantity of water corresponding to a specific water / lime weight ratio of 0.60 / 1 and optionally comprises additives of the family.
• siloxanes or organic polymers having one or more ether and alcohol functional groups and mixtures thereof are optionally comprise additives of the family.
• this document mentions that at least 50% by weight of the particles is formed by platelets having a thickness of less than 150 ⁇ m, in particular of less than 75 ⁇ m (see p.12, I. 24 to 26). ).
• the document KR 2002 0004916 discloses an extinction during which additives are added gradually and at a controlled temperature, in the presence of a co-solvent.
• the additives are extinguishing retardants and surfactants or dispersants, added in a significant amount, 1 to 3% relative to the extinguishing water, ie 3% to 15% relative to the mass of quicklime.
• Document BE 1006655 in the name of the applicant relates to a process for producing a highly concentrated lime solid material (up to 60%) and low viscosity. This whitewash is prepared in the presence of a mineral anion (sulphate, sulphite or chloride) and a polyanion (polyacrylate, polymethacrylate, methacrylic acid ).
• the inorganic anion is added independently of the organic polyanion, the inorganic compound being added from the beginning of the reaction while the polyanion is added at the beginning, during or at the end of the reaction and preferably during or at the end of the reaction. reaction, which is clearly related to their respective roles.
• the mineral anion is intended to slow the hydration of quicklime and lead to the formation of larger crystals of Ca (OH) 2 , the polyanion playing a role of dispersant.
• the milk obtained by this method contains microfeuilles of Ca (OH) 2 .
• microfeuilles have a thickness of less than 0.5 ⁇ m, preferably of 0.3 ⁇ m, and may have a lower face and an upper face parallel to each other, the surface of said faces being less than 200 ⁇ m 2 , preferably less than 100 ⁇ m. 2 .
• JP 60086066 discloses a use of a strong acid metal salt alone or in combination with a polyhydric alcohol for the purpose of obtaining slaked lime crystals in the form of platelets. The rate of these specific morphology crystals with respect to non-uniform Ca (OH) 2 particles is not reported.
• the temperature of the hydration reaction is kept below 50 ° C. in order to limit the speed of the hydration reaction.
• sulphates sulphites and bisulphites also
• sulphates contributes to the formation of platelet hexagonal crystals of calcium hydroxide.
• the level of hexagonal crystals remains reduced and the width of the platelets generally remains low in comparison with their thickness.
• sulphate as the only additive during extinction, for example according to JP 60086066, makes it possible to observe platelets with a SEM but of small size (diameter ⁇ 5 ⁇ m) and thick with respect to their size (thickness: 1 - 5 ⁇ m).
• the aim of the invention is to overcome the drawbacks of the state of the art by providing slaked lime compositions which have a high content of Ca (OH) 2 particles having a defined morphology, unlike the documents of the prior art. for which the presence of platelets is fortuitous and / or uncontrolled and in all cases, the platelet morphology is a minority.
• a composition of slaked lime having a platelet content between 50 and 100% relative to the total particles of Ca (OH) 2 and said form factor is between 10 and 300
• composition according to the invention therefore has a majority of Ca (OH) 2 particles which are in the form of platelets and the formation of these platelets is controlled and reproducible, namely that the level of these particles of Ca ( OH) 2 of defined morphology is greater than 50%, relative to the total particles of Ca (OH) 2 , including those of random morphology, usually encountered.
• said platelets have a face of characteristic dimension D, greater than the thickness e.
• the characteristic dimension D is the diameter of the circle circumscribing one face of the wafer.
• these three-dimensional crystals of Ca (OH) 2 defined morphology have a D / e ratio greater than or equal to 10.
• the particles having a platelet crystalline morphology have a form factor D / e of between 10 and 300, preferably between 20 and 200, more preferably between 30 and 100, advantageously between 45 and 80.
• the particles of the slaked lime composition according to the invention have a substantially hexagonal platelet crystal morphology.
• substantially hexagonal platelet crystalline morphology crystallized particles of slaked lime in three dimensions, one of whose faces, when the crystallization is complete, an irregular hexagonal section, regular or truncated.
• the slaked lime composition has a platelet content greater than 70%, more particularly greater than 80% and advantageously greater than
• the dimension D is between 1 ⁇ m and 80 ⁇ m.
• the majority of the particles having a platelet crystalline morphology will have, more particularly a dimension D between 2 and 40 microns and preferably between 3 microns and 30 microns.
• the thickness e is between 0.05 ⁇ m and
• the composition according to the invention is obtained by adding at least one inorganic compound having a sulfur content and an organic compound, namely diethylene glycol (DEG). Consequently, the composition according to the invention has a sulfur content, preferably between 0.01% and 1.5% relative to the weight of the composition.
• the composition according to the invention has, in a preferred form, a DEG content, preferably between 0.1% and 2% relative to the weight of the composition.
• the slaked lime composition according to the invention makes it possible to maintain a relatively high concentration of Ca (OH) 2 and thus to provide a composition of high purity.
• the calcium hydroxide is present in an amount ranging from 80% to 98% by weight relative to the total weight of the composition, preferably in an amount of between 85% and 97%, more particularly between 90% and 96% and very advantageously between 92% and 95% by weight relative to the total weight of the composition. It is indeed particularly advantageous that the slaked lime composition according to the invention is of high purity, all morphologies combined.
• the alkali metal content (sodium or potassium in particular) of the composition according to the invention is less than 3% by weight, more particularly less than 2% and even less than 1% by weight, relative to the total weight of the composition.
• the invention also relates to a process for producing a slaked lime from a quicklime.
• This process is characterized in that it comprises: a mixture of quicklime, extinguishing water, a sulfur-containing mineral additive and DEG, - an extinction of said quicklime by said extinguishing water, in the presence of said sulfur-containing mineral additive and DEG, forming platelets of Ca (OH) 2 having a circle diameter circumscribed to the wafer and a thickness, and a shape factor consisting of a ratio of said circle diameter circumscribing the platelet with a thickness of between 10 and 300, at a platelet content of between 50 and 100% relative to the total of the Ca (OH) 2 particles formed
• a slaked lime composition according to the invention can be prepared according to a method of slaking lime using a pair of additives, one being of mineral origin (sulfur mineral additive), the other organic (DEG). .
• Said sulfur-containing mineral additive and DEG can be added to either quicklime or extinguishing water, together or separately (one in quicklime, the other in water). In all cases, these two additives must be present when the water is brought into contact with the quicklime.
• said sulfur mineral additive is added to the quicklime and the DEG is added to the quenching water.
• said sulfur mineral additive and DEG are added to the quenching water.
• the method according to the invention does not require more infrastructure than an infrastructure in which a current channel extinction is performed.
• the process is indeed particularly flexible since the additives are added to either quicklime or extinguishing water.
• it is advantageous that the combination of additive is added to the extinguishing water.
• the sulfur-containing mineral additive is chosen from the group of sulfur-containing compounds, preferably from sulphates, sulphites, bisulfates and bisulfites with solubility (at 20 ° C.)> 1 g / dm 3 , of their derivatives and of their mixtures.
• Said mineral additive is more particularly chosen from the group consisting of CaSO 4 (in the form of gypsum CaSO 4 .2H 2 O for example), MgSO 4 , Na 2 SO 4 , Na 2 SO 3 , NaHSO 4 and NaHSO 3 , their derivatives and their mixtures
• the sulfur-containing mineral additive is, according to the invention, a salt, or the corresponding acid, chosen so that it is capable of forming a weakly soluble compound with the calcium ions in solution at the time of the hydration reaction.
• quick lime This poorly soluble compound preferably has a solubility in water of between 0.05 and 3 g / dm 3 at 20 ° C.
• said sulfur-containing mineral additive is added in an amount of between 0.1% and 5%, in particular between 0.3% and 2.5% and preferably between 0.5% and 1.5% by weight of anhydrous additive relative to the weight of quicklime.
• the total amount of sulfur, from quicklime and said sulfur mineral additive present in the medium before extinction is between 0.03% and 1.75%.
• Part of the sulfur present in the medium before extinction can of course be removed by the excess water and it is estimated that the fraction of sulfur remaining in the composition according to the invention varies between 50% and 100% of the sulfur initially present in the medium. before extinction.
• the DEG is advantageously added in an amount ranging from 0.1% to 2.5% by weight relative to the weight of quicklime, more particularly from 0.2% to 1%, and particularly preferential from 0.3% to 0.6% by weight relative to the weight of quicklime.
• said water is added for extinction in a quicklime / water weight ratio of between 1/1, 5 and 1/12.
• quicklime is added to the water.
• the product is then obtained in the form of a paste or a milk of lime.
• the reaction time is 1 to 5 hours, especially 2 hours.
• the medium is stirred during part or all of the reaction time.
• the process does not require temperature control.
• a curing time of the aforesaid mixture, with or without stirring, of several hours, in particular from 12 h to 24 h can also be applied to the medium.
• a subsequent step of removing the water, possibly combined with deagglomeration or grinding, allows to harvest a powdery product. This method allows a control of the morphology, thanks to the aforementioned combination of additives.
• FIG. 1 is a scanning electron microscope view focused on a Ca (OH) 2 wafer obtained according to the invention.
• FIG. 2 is a scanning electron microscope view of a set of Ca (OH) 2 platelets of the composition according to the invention.
• FIG. 3 is another view by scanning electron microscope focused on a Ca (OH) 2 wafer of the composition according to the invention.
• Figure 4 is a graphic illustration of the incidence of the sulfur-containing mineral additive (gypsum) and DEG on the kinetics of the quicklime quenching reaction according to the invention.
• the composition according to the invention has particles of Ca (OH) 2 in the form of substantially hexagonal platelets having a high form factor (low thickness e and high diameter D). circumscribed circle).
• Figure 2 illustrates a set of obtained particles where the number of platelets is high.
• the particles have a platelet crystalline morphology (small thickness e and large diameter D) substantially hexagonal. This means that the crystallization tends to form regular or irregular hexagonal crystals and that this includes all the intermediate forms illustrated in FIG.
• FIG. 4 represents the evolution of the temperature as a function of the extinction time when 150 g of industrial quicklime are hydrated in 600 ml of water, initially at 20 ° C.
• Four situations are illustrated: 1. a control solution without additive; 2. extinction of quicklime with water containing 0.5% DEG; 3. slaking quicklime with water containing 1% gypsum and 4. quenching quicklime with water containing 1% gypsum and 0.5% DEG.
• the percentages of aforementioned additives are expressed in relation to the weight of quicklime.
• the DEG alone hardly modifies the curve with respect to the control solution. Moreover, no platelet formation is observed (see in particular Comparative Example No. 2).
• gypsum alone can delay the reaction.
• the delay in hydration is represented by the value of t 6 o, namely the time required to reach 60 0 C in the suspension of slaked lime, from a water at 20 ° C. A platelet morphology is observed but the form factor is low (see in particular Comparative Example No. 1).
• the mass of water used for a hydration reaction is calculated according to the selected CaO / H 2 O mass ratio. for this reaction, as shown in Table 1 below.
• the calculated mass of water, previously heated to 20 ° C. is introduced into a container equipped with a stirring system.
• the stirring system is chosen such that the diameter of the stirring blades corresponds to about 50% of the internal diameter of the isothermal vessel.
• the additives are added to the water, first the mineral and then the organic (DEG); the different additives used as well as the proportions in which they were added, are noted in the table
• Ratio 1 % by weight of anhydrous sulfur-containing mineral compound relative to CaO mass.
• Ratio 2 % by weight of DEG relative to the mass of CaO.
• Report 3 weight ratio of the amount of quicklime to the quantity of water
• e in ⁇ m 5 platelet thickness in ⁇ m
• P% 6 proportion of particles with a platelet morphology to the total number of Ca (OH) 2 particles.
• Example 1 was repeated with 20 kg of quicklime.
• the product obtained under the conditions given with 20 kg of quicklime is similar to that obtained under the same experimental conditions with 150 g of quicklime.
• the proportion of platelets obtained was greater than 90%, the platelet diameter D was between 3 and 45 ⁇ m while the thickness e was 0.2 to 0.3 ⁇ m.
• the form factor was between 10 and 225.
• Example 1 was repeated but without adding any organic compound.
• the mass of sulfur in quicklime is 0.015 g while the mass of sulfur provided by the mineral additive is 0.353 g.
• the mass of the initial solid mixture is 151.5 g and the percentage of sulfur in the initial mixture is therefore 0.24.
• Table 2 As can be seen, many Ca (OH) 2 slaked lime of platelet crystalline morphology are synthesized, but the platelets are very small and the form factor is low.
• Example 1 was repeated but the mineral additive is sodium sulfate and the proportion of quicklime in relation to the amount of water was 1 / 0.6. The results are shown in Table 2. As can be seen, platelet formation was not observed, which can probably be attributed to the fact that the proportion of quicklime in relation to the amount of water is too high . Comparative Example 4
• Example 2 was repeated but the mineral additive is magnesium nitrate hydrated six times. The results are shown in Table 2.
• Example 2 was repeated but the mineral additive is magnesium iodate hydrated four times. The results are shown on the chart
• the mass of sulfur in quicklime is 0.015 g while the mass of sulfur provided by the mineral additive is
• Example 1 was repeated, but the mineral additive added at a level of 1% of anhydrous mineral additive relative to the weight of quicklime is Na 2 S 2 O 3 hydrated five times, a carrier of soluble sulfur but which form with the Ca ++ ions in solution from the quicklime highly soluble (solubility in water at 20 0 C CaS 2 O 3 high).
• the mass of sulfur in the quicklime is 0.015 g while the mass of sulfur provided by the mineral additive is 0.608 g.
• the mass of the initial solid mixture is 151.5 g and the percentage of sulfur in the initial mixture is therefore 0.41.
• the results are shown in Table 2. As can be seen, platelet formation was not observed. Comparative Example 8
• Example 1 was repeated, but decreasing the proportion of water in the mixture.
• 500 g of quicklime No. 1 was added in 500 g of demineralized water at 20 ° C., which corresponds to a CaO / H 2 O ratio of 1/1 instead of 1/4 in the example 1.
• This case can be considered as hydration in pasty / dry way.
• Stirring was modified to obtain a homogeneous mixture.
• the mass of sulfur in the quicklime is 0.05 g while the mass of sulfur provided by the mineral additive is 1. 176 g.
• the mass of the initial solid mixture is 505 g and the percentage of sulfur in the initial mixture is therefore 0.24.
• Table 2 comparative examples
• Ratio 1 % by weight of the anhydrous compound relative to the mass of CaO.
• Ratio 2 % by weight of the organic additive relative to the mass of CaO.
• Report 3 weight ratio of the amount of quicklime to the quantity of water
• e in ⁇ m 5 platelet thickness in ⁇ m.
• P% 6 proportion of particles with platelet morphology relative to the number of Ca (OH) 2 particles.
• Comparative Example 9 Example 1 was repeated, but the DEG which is the organic additive used in Example 1 is replaced by mono-ethylene glycol (MEG) at a level of 0.5% by weight of the lime. vivid.
• the mass of sulfur in the quicklime is 0.015 g while the mass of sulfur provided by the mineral additive is 0.353 g.
• the mass of the initial solid mixture is 151.5 g and the percentage of sulfur in the initial mixture is therefore 0.24.
• Table 3 As can be seen, the platelets obtained are small and their form factor is low.
• Example 1 was repeated, but the DEG which is the organic additive used in Example 1 is replaced by th-ethylene glycol (TEG) to 3% of the weight of the quicklime.
• the mass of sulfur in quicklime is 0.015 g while the mass of sulfur brought by the mineral additive is 0.353 g.
• the mass of the initial solid mixture is 151.5 g and the percentage of sulfur in the initial mixture is therefore 0.24.
• the results are shown in Table 3. As can be seen, the platelets obtained are small and their form factor is low.
• the Ca (OH) 2 quenched lime particles of platelet crystalline morphology obtained are similar to that obtained in Comparative Example 1 in the presence of gypsum only, indicating that TEG has no additional effect with respect to gypsum alone.
• Comparative Example 11 Example 1 was repeated, but the DEG which is the organic additive used in Example 1 is replaced by diethanolamine (DEA) at 3% of the weight of the quicklime.
• the mass of sulfur in the quicklime is 0.015 g while the mass of sulfur provided by the mineral additive is 0.353 g.
• the mass of the initial solid mixture is 151.5 g and the percentage of sulfur in the initial mixture is therefore 0.24.
• the results are shown in Table 3. As can be seen, the platelets obtained are small and their form factor is low.
• the Ca (OH) 2 quenched limestone particles of platelet crystalline morphology obtained are similar to that obtained in Comparative Example 1 in the presence of gypsum only, indicating that DEA has no additional effect with respect to gypsum alone.
• Ratio 1 % by weight of the anhydrous compound relative to the mass of CaO.
• Ratio 2 % by weight of the organic additive relative to the mass of CaO.
• Ratio 3 weight ratio of the amount of quicklime to the quantity of water
• e in ⁇ m 5 platelet thickness in ⁇ m.
• P% 6 proportion of particles with platelet morphology relative to the number of Ca (OH) 2 particles.

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