CN114988725A - Calcium hydroxide suspension and efficient preparation method thereof - Google Patents

Calcium hydroxide suspension and efficient preparation method thereof Download PDF

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Publication number
CN114988725A
CN114988725A CN202210720553.9A CN202210720553A CN114988725A CN 114988725 A CN114988725 A CN 114988725A CN 202210720553 A CN202210720553 A CN 202210720553A CN 114988725 A CN114988725 A CN 114988725A
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calcium hydroxide
quicklime
water
digestion
hydroxide suspension
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CN114988725B (en
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陈婷
孔凡滔
程颖慧
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Anhui Qianjiang Superfine Powder Technology Co ltd
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Anhui Qianjiang Superfine Powder Technology Co ltd
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    • 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
    • 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
    • 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

Abstract

The invention discloses a high-efficiency preparation method of calcium hydroxide suspension, which comprises the steps of crushing and sieving high-activity quicklime to prepare reactant quicklime, adding an activity promoter and/or a stabilizer into water to prepare digestion water, simultaneously and continuously adding the digestion water and the reactant quicklime into a reactor in proportion under the state that a stirrer is continuously stirred or a rotary drum is continuously rotated, and controlling the reaction temperature and the retention time to ensure that the time of the digestion reaction temperature above 60 ℃ is not more than 60 minutes and not less than 20 minutes; and collecting the reacted mixed liquor, and performing hydrocyclone separation and/or screening on the obtained mixed liquor to remove large-particle impurities in the mixed liquor to obtain a finished product of the target calcium hydroxide suspension. The process can produce the calcium hydroxide suspension with high reaction activity, high calcium hydroxide content and low viscosity, has the advantages of delicate process, short flow, no need of expensive equipment and additives, low cost and high applicability, can realize continuous production, and improves the stability and consistency of product quality.

Description

Calcium hydroxide suspension and efficient preparation method thereof
Technical Field
The invention belongs to the technical field of calcium hydroxide production, and relates to a calcium hydroxide suspension and an efficient preparation method thereof.
Background
The calcium hydroxide is widely applied in the water treatment fields of neutralization of acidic wastewater, removal of heavy metal ions, phosphate ions, sulfate ions, fluoride ions and the like. In water treatment practice, calcium hydroxide is generally used as a suspension with water or after a calcium hydroxide suspension is obtained by wet digestion of calcium oxide.
The calcium hydroxide has the advantages of good safety and lower price than inorganic alkaline treatment agents such as sodium hydroxide, sodium carbonate and the like, but the defects mainly comprise two aspects: firstly, calcium hydroxide is slightly soluble in water, and compared with water-soluble alkali such as sodium hydroxide and the like, when chemical reaction occurs, the calcium hydroxide is firstly dissolved in water, and then calcium ions or hydroxide ions react with harmful substances in wastewater, so that the treatment speed of the calcium hydroxide is slower than that of the water-soluble alkali such as sodium hydroxide and the like when the calcium hydroxide is used for treating wastewater, and the water treatment efficiency is influenced; secondly, the solid content of the common calcium hydroxide suspension is 5-10% (while the concentration of the sodium hydroxide solution commonly used for water treatment is more than 30%), and the viscosity of the suspension is too high due to the high concentration, so that the suspension is difficult to convey and measure, and the production load and the production cost in the pulp preparation link are obviously increased. In addition to the two main defects, calcium hydroxide also has the problems of incomplete reaction, excessive addition, high impurity content, increased water treatment sludge amount and the like. Therefore, from the application point of view, calcium hydroxide suspension with high reactivity, high solid content, low viscosity and low impurity content is ideal for the water treatment industry.
It has been found that the dissolution rate of calcium hydroxide in water is related to the particle size, the smaller the particle size, the faster the dissolution rate, and correspondingly the faster the chemical reaction rate, the better the reactivity of calcium hydroxide. At the same time, however, the smaller the particle size, the greater the viscosity of the suspension, which limits the increase in the calcium hydroxide content of the suspension. Therefore, it is technically difficult to obtain a calcium hydroxide suspension having high reactivity, high content and low viscosity at the same time.
To solve the above problems, a great deal of research has been conducted, which mainly includes:
(1) the viscosity of the suspension is reduced by using an additive which can form precipitates or slightly soluble substances with calcium ions, for example, when calcium oxide is subjected to a digestion reaction with water, substances such as gypsum and the like are added into the water to reduce the viscosity of lime milk. However, this method causes a decrease in the reactivity of calcium hydroxide.
(2) The viscosity is reduced by adding an organic polymer dispersant during the preparation of the calcium hydroxide suspension or during the wet digestion of calcium oxide, for example, the viscosity of the calcium hydroxide suspension is reduced by adding a polyacrylate dispersant in patent WO2018/048633A 1. Although the addition of the dispersant can reduce the viscosity of the suspension, the primary particle size of calcium hydroxide cannot be reduced, i.e., the reactivity of calcium hydroxide is not improved.
(3) The method of wet milling (or milling + dispersing agent) is used to reduce the particle size of the calcium hydroxide and thereby increase the reactivity of the calcium hydroxide, as disclosed in US 2019002301. The method increases the preparation steps of the suspension, is more complicated, and increases the addition proportion of corresponding additives although the particle size is reduced, thereby bringing obvious influence on the production cost.
(4) High activity, low viscosity suspensions were prepared by varying the digestion process. For example, in patents CN106470960 and US2019092684, suspensions of calcium hydroxide are prepared by stepwise addition of water to lime, the water containing a dispersant or an inorganic salt. This approach is highly demanding for digestion equipment because at low water-to-ash ratios the lime slake product is pasty and has a very high viscosity that ordinary equipment cannot meet.
In summary, the methods for preparing calcium hydroxide suspensions in the prior art have many disadvantages, which limit the application of calcium hydroxide suspensions in various fields, and in addition, digestion reactions in the production process of calcium hydroxide suspensions are mostly generated by one-time reactions, which has little research on products generated by continuous reactions, and the products produced in each batch have poor consistency.
Disclosure of Invention
In order to fill the blank of the prior art, the invention provides a method for efficiently preparing calcium hydroxide suspension, which overcomes the defects of the prior art and has continuous production and high product stability and consistency.
The technical scheme of the invention is as follows:
a high-efficiency preparation method of calcium hydroxide suspension comprises the following steps:
s1: preparation of reactant quicklime: crushing and sieving quicklime to obtain the quicklime with the particle size of less than 8mm, namely reactant quicklime, wherein the quicklime is high-activity quicklime with the activity degree of more than 360;
s2: preparation of water for digestion: adding water with the water temperature of 15-40 ℃ into a container with a stirrer, adding an active promoter and/or a stabilizer into the water, stirring and dissolving to prepare water for digestion, wherein the mass ratio of the water for digestion to reactant quicklime is 2: 1-4: 1, the mass ratio of the total mass of the added active promoter and/or the stabilizer to the reactant quicklime is 5: 1000-40: 1000, the active promoter is a substance which can make the water alkaline after being dissolved in the water and is mixed with calcium hydroxide to avoid generating precipitates, and the stabilizer is one or a mixture of micromolecular dispersant, sugar alcohol and saccharide;
s3: under the state that a stirrer of a reactor continuously stirs or a rotary drum continuously rotates, simultaneously and continuously adding digestion water and reactant quicklime into the reactor in proportion, controlling the reaction temperature and the retention time to ensure that the time of the digestion reaction temperature above 60 ℃ is not more than 60 minutes and not less than 20 minutes, then opening a valve of the reactor to discharge the reacted mixed liquid outwards, wherein the discharge speed is equal to the feeding speed of the digestion water and the reactant quicklime, and the discharge speed is equal to the feeding speed to keep the material quality in the reactor unchanged, wherein the discharge speed refers to the weight of the mixed liquid discharged per minute, and the feeding speed refers to the total weight of the digestion water and the reactant quicklime added per minute;
s4: and collecting the reacted mixed liquor, and performing hydrocyclone separation and/or screening on the obtained mixed liquor to remove large-particle impurities in the mixed liquor to obtain a finished product of the target calcium hydroxide suspension.
Further, in the step S1, the particle size of the screened ready-to-use quicklime is less than 5 mm.
Further, in the S1, the activity degree of the high-activity quicklime is not lower than 380.
Further, the activity promoter is one or a mixture of more of sodium hydroxide, potassium hydroxide, sodium acetate, sodium formate, monoethanolamine, diethanolamine and triethanolamine.
Further, the stabilizer is one or a mixture of potassium pyrophosphate, sodium hexametaphosphate, xylitol, sorbitol, erythritol, sucrose, glucose and fructose.
Furthermore, the ratio of the total mass of the added active accelerant and/or stabilizer to the mass of the ready quicklime is 10: 1000-30: 1000.
Further, the reactor is a digestion reactor with a stirring device or a rotary digestion reactor.
The calcium hydroxide suspension prepared by any one of the preparation methods has the calcium hydroxide mass content of 25-45%, the particle size distribution of D50 which is more than or equal to 3 mu m and less than or equal to 5.5 mu m, D97 which is less than or equal to 20 mu m, D100 which is less than or equal to 40 mu m, viscosity which is less than or equal to 400 centipoises (namely cP, 1cP which is 1mPa.s) at 25 ℃ and the reaction activity t90 which is less than or equal to 4.5 seconds.
The quicklime mentioned in step S1 is tested according to the method specified in YB/T105-2005 metallurgical lime physical inspection method, the activity degree is not lower than 360, preferably not lower than 380, and the use of the quicklime with lower activity can cause the digestion reaction speed to be slow and the reaction activity of the calcium hydroxide to be reduced. The method has the advantages that the quicklime is crushed and then used, so that the digestion reaction process is more uniform and stable, the phenomena of bumping, local overheating and the like caused by porous massive lime are reduced, and the stability of the product quality is facilitated. The size of the ground and sieved lime particles is not more than 8mm, otherwise the phenomena of bumping and the like are easily caused; the size of the crushed and sieved quicklime particles is preferably less than 5mm, and experiments show that the size has more remarkable effect on eliminating phenomena such as bumping and the like.
In step S2, a temperature of the water for digestion lower than 15 ℃ leads to a decrease in reactivity of the resulting calcium hydroxide suspension, while a temperature higher than 40 ℃ leads to a significant increase in viscosity of the calcium hydroxide suspension. The mentioned active promoter is a substance which can make water alkaline after being dissolved in water, but does not include a substance which can react with calcium hydroxide to generate precipitate, and sodium hydroxide, potassium hydroxide, sodium acetate, sodium formate, monoethanolamine, diethanolamine, triethanolamine and the like are preferred. The mentioned stabilizer has double functions of improving the reaction activity of calcium hydroxide and reducing the agglomeration of calcium hydroxide particles, can be used alone or together with an activity promoter, and preferred stabilizers include small molecular dispersing agents such as potassium pyrophosphate, sodium hexametaphosphate, sugar alcohols such as xylitol, sorbitol, erythritol and sugar substances such as sucrose, glucose, fructose and the like. The total mass of the active promoter and/or stabilizer added is 0.5-4%, preferably 1-3% of the mass of the active quicklime. The water-ash mass ratio of the digestion reaction is 2: 1-4: 1, the viscosity is too high when the water-ash ratio is too low, and the content of calcium hydroxide in the suspension is lower when the water-ash ratio is higher than 4: 1, so that the economy is not good. The quicklime and the water for digestion are respectively metered into the digestion reactor according to a set proportion, the adding speed is determined according to the volume of the reactor and the set material retention time, and the mass ratio of the added water to the quicklime at any moment is ensured to meet the set value requirement.
In step S3, when calcium hydroxide is generated by a digestion reaction between quicklime and water, heat is released to raise the temperature of the reaction system, and for the preparation of calcium hydroxide suspension, the temperature rise is favorable for the digestion reaction to be more complete, but the long-term high temperature will cause the reaction activity of calcium hydroxide to decrease, so the time of the digestion reaction temperature above 60 ℃ should not exceed 60 minutes and should not be less than 20 minutes.
In step S4, during normal production, the digestion product is continuously discharged, and the discharging speed is consistent with the material feeding speed so as to ensure the continuous and stable production. The suspension obtained from the discharge of the digestion reaction is removed with large particles by a hydrocyclone and/or a vibrating screen, and the like, so that the unreacted impurities carried in the lime raw material, such as silicon oxide, aluminum oxide, unburnt limestone and the like, can be removed, the content of calcium hydroxide in the suspension is increased, and the sludge amount generated in sewage treatment is reduced.
In conclusion, the beneficial effects of the invention are as follows:
(1) the invention can greatly improve the production efficiency of the calcium hydroxide suspension by the continuous preparation process, and meanwhile, the quality stability and consistency of the product are higher by using the continuous production process.
(2) According to the invention, the calcium hydroxide suspension with high reactivity, high calcium hydroxide content and low viscosity is prepared by accurately controlling the raw materials, the process and the auxiliary agent, and large-particle impurities in the suspension are removed by a hydrocyclone separation or sieving method, so that the problems of low reaction speed, low production efficiency, high addition amount, more sludge and the like existing in the existing calcium hydroxide application in water treatment are solved.
(3) The additives used in the invention are common small molecular chemical reagents, a polymer dispersant with high price is not selected, and the optimal effect is realized by adjusting the combination of different reagents; meanwhile, the method has low requirements on equipment, does not need special equipment such as a high-torque digester and the like, is simple to operate, has short reaction flow and good process flow applicability, and reduces the production cost.
Detailed Description
The following describes in detail embodiments of the present invention.
Example 1
S1, preparation of reactant quicklime: crushing high-activity quicklime with the activity degree of 400 by using a crusher, sieving to select powder with the particle size less than 5mm, adding the powder into a charging barrel, wherein the charging barrel is provided with a control valve for controlling the discharging speed, and the quantity of the reactant quicklime powder added into the charging barrel is 20 kg;
s2: preparation of water for digestion: adding 79.84kg of water into a tank (container) with a stirrer, controlling the water temperature at 40 ℃, adding 80g of sodium hydroxide and 80g of potassium pyrophosphate into the water, namely, the digestion water is dissolved with 0.1 percent of sodium hydroxide and 0.1 percent of potassium pyrophosphate, the tank is provided with a flow control valve for controlling the discharge speed, and the water and the additive are timely supplemented into the container according to the formula proportion according to the consumption speed of the digestion water during the digestion reaction;
s3: 0.08m with condensate return device 3 In the stirred reactor, water and the reactant quicklime were fed to the reactor at 0.8 kg/min and 0.2 kg/min, respectively, while stirring. After the quicklime and the water are mixed, the reaction system is quickly heated to more than 60 ℃, and 60 minutes is carried out from the beginning of feedingThe inner reaction kettle (namely the reactor) does not discharge materials, a valve at the bottom of the reaction kettle is opened after 60 minutes, the materials are discharged by a pump, the discharging speed is controlled to be 1 kg/minute so as to keep the quality of the materials in the reaction kettle unchanged, and the continuous preparation of the continuous addition of the raw materials and the continuous discharging of the mixed liquid after the reaction is realized.
S4: and collecting the reacted mixed liquor, and sieving the obtained mixed liquor by a 200-mesh sieve to remove large-particle impurities in the mixed liquor to obtain a target calcium hydroxide suspension finished product.
The content of the calcium hydroxide in the obtained calcium hydroxide suspension is tested according to the method specified in GB/T27815-2011 Industrial milk calcium hydroxide; the viscosity of the suspension is tested by using an NDJ-9S rotational viscometer, the temperature of the suspension is stabilized at 25 ℃, and the suspension is tested by using a No. 2 or No. 3 rotor at the rotating speed of 60 revolutions per minute; the particle size distribution of the solid particles in the suspension was tested using a laser particle sizer; the reactivity of calcium hydroxide in the suspension is determined by conductivity method, i.e. according to the content of calcium hydroxide in the suspension, 0.1g of the suspension containing calcium hydroxide is weighed, the suspension is rapidly poured into 700g of deionized water (water temperature is 25 ℃), the change of the conductivity of the deionized water along with time is recorded, and the time consumed from pouring the calcium hydroxide suspension until the conductivity reaches 90% of the maximum value is calculated and recorded as t90, and the smaller t90, the faster the dissolution speed of calcium hydroxide is, and the higher the reactivity is.
Through determination, the calcium hydroxide suspension prepared in this example has the following indexes: calcium hydroxide content 25%, t90 ═ 4.5 seconds, viscosity 166cP, D50 ═ 5.5 μm, D97 ═ 20 μm, and D100 ═ 40 μm.
Example 2
With reference to example 1, 0.08m with condensate return 3 In a stirring type reactor, slaking water and reactant quicklime are respectively added into the reactor according to the speed of 2 kg/min and 1 kg/min under the stirring state, wherein the activity of the quicklime is 360, the granularity is less than 8mm, the water temperature is 15 ℃, the concentration of sodium acetate dissolved in the slaking water is 0.22 percent, and the concentration of glucose dissolved in the slaking water is 1 percent. After the reactant quicklime and the water for digestion are mixed, the reaction system is quickly heated to more than 60 ℃, the reaction kettle does not discharge materials within 20 minutes from the beginning of feeding, and the reaction kettle does not discharge materials within 20 minutesThen opening a valve at the bottom of the reaction kettle, discharging by a pump, and controlling the discharging speed to be 3 kg/min to keep the quality of the materials in the reaction kettle unchanged, thereby realizing the continuous preparation of the continuous addition of the raw materials and the continuous discharging of the products.
The discharged mixed solution after the reaction was sieved through a 200-mesh sieve, and a calcium hydroxide suspension having a calcium hydroxide content of 45%, a t90 ═ 2.8 seconds, a viscosity of 450cP, a D50 ═ 3 μm, a D97 ═ 15.9 μm, and a D100 ═ 37.5 μm was obtained by detection.
Example 3
Reference example 1, 0.08m with condensate return 3 In the stirring type reactor, under the stirring state, slaking water and reactant quicklime are respectively added into the reactor according to the speed of 1.2 kg/min and 0.4 kg/min, wherein the activity of the quicklime is 380, the granularity is less than 5mm, the water temperature is 20 ℃, the water is dissolved with sorbitol with the concentration of 0.67 percent and sodium hexametaphosphate with the concentration of 0.33 percent. After mixing the reactant quicklime and the digestion water, quickly heating a reaction system to above 60 ℃, not discharging the materials from the reaction kettle within 40 minutes from the beginning of feeding, opening a valve at the bottom of the reaction kettle after 40 minutes, discharging the materials by using a pump, and controlling the discharging speed to be 1.6 kg/minute so as to keep the quality of the materials in the reaction kettle unchanged, thereby realizing the continuous preparation of the continuous feeding of the raw materials and the continuous discharging of the product.
The discharged mixture after the reaction was sieved through a 200 mesh sieve, and the mixture was examined to obtain a calcium hydroxide suspension having a calcium hydroxide content of 35%, a t90 of 3.6 seconds, a viscosity of 304cP, a D50 of 5.1 μm, a D97 of 18.1 μm, and a D100 of 39.5 μm.
Example 4
With reference to example 1, 0.08m with condensate return 3 In a stirring type reactor, under the stirring state, digestion water and reactant quicklime are respectively added into the reactor at the speed of 1.6 kg/min and 0.4 kg/min, wherein the activity of the quicklime is 390, the granularity is less than 5mm, the water temperature is 30 ℃, and the dissolved concentration in the water is 0.25 percent of triethanolamine, 0.25 percent of xylitol and 0.5 percent of sucrose. After the reactants of quicklime and water for digestion are mixed, the reaction system is quickly heated to above 60 ℃, the materials are not discharged from the reaction kettle within 30 minutes from the beginning of feeding, and after 30 minutes, a valve at the bottom of the reaction kettle is opened, a pump is used for discharging the materials, and the materials are controlled to be dischargedThe material speed is 2 kg/min to keep the material quality in the reaction kettle unchanged, and the continuous preparation of the continuous feeding of the raw materials and the continuous discharging of the products is realized.
The discharged mixed solution after the reaction was sieved through a 200 mesh sieve, and the calcium hydroxide suspension having a calcium hydroxide content of 25%, a t90 value of 4 seconds, a viscosity of 187cP, a D50 value of 5.3 μm, a D97 value of 17.9 μm, and a D100 value of 40 μm was obtained by detection.
In summary, the process can produce the calcium hydroxide suspension with high reactivity, high calcium hydroxide content and low viscosity, and the calcium hydroxide suspension has various performance indexes of the calcium hydroxide with the mass content of 2545%, the particle size distribution of 3 mu m-D50-5.5 mu m, D97-20 mu m, D100-40 mu m, the viscosity of 25 ℃ of 400 centipoises (centipoises namely cP, 1 cP-1 mPa.s) and the reactivity t90 of 4.5 seconds; the process is exquisite and short in flow, expensive equipment and additives are not needed, the cost is low, the applicability is high, continuous production can be achieved, and the stability and consistency of product quality are improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A high-efficiency preparation method of calcium hydroxide suspension is characterized by comprising the following steps: the method comprises the following steps:
s1: preparation of reactant quicklime: crushing and sieving quicklime to obtain the quicklime with the particle size of less than 8mm, namely reactant quicklime, wherein the quicklime is high-activity quicklime with the activity degree of more than 360;
s2: preparation of water for digestion: adding water with the water temperature of 15-40 ℃ into a container with a stirrer, adding an active promoter and/or a stabilizer into the water, stirring and dissolving to prepare water for digestion, wherein the mass ratio of the water for digestion to reactant quicklime is 2: 1-4: 1, the mass ratio of the total mass of the added active promoter and/or the stabilizer to the reactant quicklime is 5: 1000-40: 1000, the active promoter is a substance which can make the water alkaline after being dissolved in the water and is mixed with calcium hydroxide to avoid generating precipitates, and the stabilizer is one or a mixture of micromolecular dispersant, sugar alcohol and saccharide;
s3: under the state that a stirrer of a reactor continuously stirs or a rotary drum continuously rotates, simultaneously and continuously adding digestion water and reactant quicklime into the reactor in proportion, controlling the reaction temperature and the retention time to ensure that the time of the digestion reaction temperature above 60 ℃ is not more than 60 minutes and not less than 20 minutes, then opening a valve of the reactor to discharge the reacted mixed liquid outwards, wherein the discharge speed is equal to the feeding speed of the digestion water and the reactant quicklime, and the discharge speed is equal to the feeding speed to keep the material quality in the reactor unchanged, wherein the discharge speed refers to the weight of the mixed liquid discharged per minute, and the feeding speed refers to the total weight of the digestion water and the reactant quicklime added per minute;
s4: and collecting the reacted mixed liquor, and performing hydrocyclone separation and/or screening on the obtained mixed liquor to remove large-particle impurities in the mixed liquor to obtain a finished product of the target calcium hydroxide suspension.
2. The method for efficiently preparing a calcium hydroxide suspension according to claim 1, wherein: in the S1, the particle size of the screened standby quicklime particles is less than 5 mm.
3. The method for efficiently preparing a calcium hydroxide suspension according to claim 1, wherein: in S1, the activity degree of the high-activity quicklime is not lower than 380.
4. The method for efficiently preparing a calcium hydroxide suspension according to claim 1, wherein: the activity promoter is one or a mixture of more of sodium hydroxide, potassium hydroxide, sodium acetate, sodium formate, monoethanolamine, diethanolamine and triethanolamine.
5. The method for efficiently preparing a calcium hydroxide suspension according to claim 1, wherein: the stabilizer is one or more of potassium pyrophosphate, sodium hexametaphosphate, xylitol, sorbitol, erythritol, sucrose, glucose and fructose.
6. The method for efficiently preparing a calcium hydroxide suspension according to claim 1, wherein: the ratio of the total mass of the active accelerant and/or the stabilizer to the mass of the standby quicklime is 10: 1000-30: 1000.
7. The method for efficiently preparing a calcium hydroxide suspension according to claim 1, wherein: the reactor is a reactor with a stirring device or a rotary digestion reactor.
8. A calcium hydroxide suspension characterized by: the calcium hydroxide suspension prepared by any one of the preparation methods has the calcium hydroxide mass content of 25-45%, the particle size distribution of 3 mu m-D50-5.5 mu m, D97-20 mu m, D100-40 mu m, viscosity at 25 ℃ of 400 centipoises (namely cP, 1 cP-1 mPa.s) and the reaction activity t90 of 4.5 seconds.
CN202210720553.9A 2022-06-21 2022-06-21 Calcium hydroxide suspension and efficient preparation method thereof Active CN114988725B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014237582A (en) * 2014-07-05 2014-12-18 古手川産業株式会社 Hydrated lime, manufacturing method of hydrated lime and acidic gas removing agent
CN104609745A (en) * 2015-01-21 2015-05-13 南宁苏格尔科技有限公司 Production control method of lime milk for preparing sugar
US20190092684A1 (en) * 2016-03-08 2019-03-28 S. A. Lhoist Recherche Et Developpement Process for Manufacturing a Milk of Slaked Lime of Great Fineness and Milk of Lime of Great Fineness Thereby Obtained With Process Water
CN112292363A (en) * 2018-03-22 2021-01-29 Sika技术股份公司 Preparation of calcium hydroxide nanoparticles and their use as promoters in mineral binder compositions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014237582A (en) * 2014-07-05 2014-12-18 古手川産業株式会社 Hydrated lime, manufacturing method of hydrated lime and acidic gas removing agent
CN104609745A (en) * 2015-01-21 2015-05-13 南宁苏格尔科技有限公司 Production control method of lime milk for preparing sugar
US20190092684A1 (en) * 2016-03-08 2019-03-28 S. A. Lhoist Recherche Et Developpement Process for Manufacturing a Milk of Slaked Lime of Great Fineness and Milk of Lime of Great Fineness Thereby Obtained With Process Water
CN112292363A (en) * 2018-03-22 2021-01-29 Sika技术股份公司 Preparation of calcium hydroxide nanoparticles and their use as promoters in mineral binder compositions

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