CN111606581A - Preparation method of liquid calcium hydroxide - Google Patents
Preparation method of liquid calcium hydroxide Download PDFInfo
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- CN111606581A CN111606581A CN202010377620.2A CN202010377620A CN111606581A CN 111606581 A CN111606581 A CN 111606581A CN 202010377620 A CN202010377620 A CN 202010377620A CN 111606581 A CN111606581 A CN 111606581A
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- calcium hydroxide
- digestion
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- slurry
- calcium oxide
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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
- C04B2/10—Preheating, burning calcining or cooling
-
- 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
- C04B2/045—After-treatment of slaked lime
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a preparation method of liquid calcium hydroxide, which comprises the following steps: calcining, impurity removal, crushing, digestion and separation, wherein the digestion step is divided into two steps, the first step is ordinary coarse digestion, the second step is grinding digestion, the improvement can be realized through grinding digestion, and the sixth step is that the calcium hydroxide slurry after grinding digestion is filtered by a filter screen to remove impurities and then is sent into a centrifugal separator, the rotating speed of the centrifugal separator is controlled, and the slurry is separated into clear liquid and liquid calcium hydroxide with corresponding concentration. Through the mode, the liquid calcium hydroxide particle grinding machine can grind liquid calcium hydroxide particles to micron level, obviously reduce deep digestion time, reduce impurities in finished products and improve product quality and production efficiency.
Description
Technical Field
The invention relates to the field of production processes, and in particular relates to a preparation method of liquid calcium hydroxide.
Background
The calcium hydroxide products commonly used in the market at present are generally solid powder, the powder calcium hydroxide is easy to generate dust in the using process and pollute the surrounding environment, the calcium hydroxide powder has strong hygroscopicity and is easy to burn the skin of a human body and not beneficial to the operation of field personnel, in order to improve the defects, liquid calcium hydroxide with high water content is started to appear in the market, the liquid calcium hydroxide avoids dust pollution and cannot burn the skin, the preparation method of the liquid calcium hydroxide is proposed in Chinese patent (CN 101503208B), but the production flow disclosed in the preparation method is long in working time, the material turnover speed is slow, and the overall production efficiency is poor.
Disclosure of Invention
The invention mainly solves the technical problem of providing a preparation method of liquid calcium hydroxide, which can improve the quality and the production efficiency of the liquid calcium hydroxide.
In order to solve the technical problems, the invention adopts a technical scheme that: the preparation method of the liquid calcium hydroxide is provided, and comprises the following steps:
step one, calcining, namely cleaning the surface of a limestone raw ore and then feeding the limestone raw ore into a lime kiln to calcine to obtain blocky calcium oxide;
removing impurities, namely removing calcium carbonate in calcium oxide by an infrared ray machine selection mode, and removing black impurities on the surface of the calcium oxide by a vibrating screen;
step three, crushing, namely introducing the treated blocky calcium oxide into a crusher to be crushed into small particles and then grinding the small particles into powder;
and step four, digesting, namely feeding calcium oxide powder into a digestion reactor, adding water and stirring, wherein the digestion in the digestion reactor is carried out for 30-45 min, and the mass ratio of the added water to the calcium oxide in the digestion reactor is 1: 1;
step five, adding the mixed slurry into the calcium hydroxide slurry obtained after the primary digestion in the step four according to the process requirements for secondary slurry preparation, and introducing the slurry into a ball mill for grinding for 2-4 hours;
and step six, filtering and removing impurities from the ground and digested calcium hydroxide slurry by a filter screen, then sending the calcium hydroxide slurry into a centrifugal separator, controlling the rotating speed of the centrifugal separator, and separating the slurry into clear liquid and liquid calcium hydroxide with corresponding concentration.
In a preferred embodiment of the invention, the digestion reactor is a spray digestion reactor.
In a preferred embodiment of the present invention, the ball mill used in the fifth step is a vibration ball mill.
In a preferred embodiment of the present invention, the material of the grinding balls in the wet ball mill is zircon, silicon carbide or corundum.
In a preferred embodiment of the present invention, the diameter of the grinding ball is 0.5 to 2 mm.
In a preferred embodiment of the invention, the addition amount of the slurry prepared in the fifth step does not exceed the initial feeding amount of the calcium oxide.
In a preferred embodiment of the present invention, the size mixing liquid added in the fifth step is a mixture of the clear liquid obtained in the sixth step and water in any proportion.
In a preferred embodiment of the present invention, a surfactant is further added to the size mixing liquid.
In a preferred embodiment of the invention, the addition amount of the surfactant is 0.5-1.5% of the addition amount of the calcium oxide.
In a preferred embodiment of the present invention, the surfactant is stearic acid or sodium dodecylbenzenesulfonate.
The invention has the beneficial effects that: the technical scheme of the invention is that a method for secondary static deep digestion is improved on the basis of a conventional preparation method of liquid calcium hydroxide, the particle size of strong calcium oxide in the whole system is reduced by an active grinding mode, and the contact probability of unreacted calcium oxide in the system and water is improved, so that the digestion efficiency and the digestion depth are improved, the total working hours of the whole production flow are obviously reduced, the turnover efficiency of a production line is improved, the particle size of a final product is uniform and fine, and the reaction speed is high during use.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
The embodiment of the invention comprises the following steps:
example 1
A preparation method of liquid calcium hydroxide comprises the following steps:
step one, calcining, namely cleaning the surface of a limestone raw ore and then feeding the limestone raw ore into a lime kiln to calcine to obtain blocky calcium oxide;
removing impurities, namely removing calcium carbonate in calcium oxide by an infrared ray machine selection mode, and removing black impurities on the surface of the calcium oxide by a vibrating screen;
step three, crushing, namely introducing the treated blocky calcium oxide into a crusher to be crushed into small particles and then grinding the small particles into powder;
and step four, digesting, namely feeding calcium oxide powder into a spray type digestion reactor, adding water in a spray mode, stirring and reacting, wherein the mass ratio of the added water amount to the calcium oxide in the spray type digestion reactor is 1: 1, the reaction time in the spray digestion reactor is 45min,
step five, adding a size mixing liquid with 0.5 time of the addition amount of calcium oxide into the calcium hydroxide size obtained after preliminary digestion in the step four to prepare size, introducing the size into a vibration ball mill to grind for 2 hours to obtain a completely digested calcium hydroxide solution, wherein a grinding ball used in the ball mill is a corundum grinding ball with the diameter of 0.5mm, and the undigested calcium oxide is fully contacted with water by grinding and breaking up agglomerated calcium hydroxide particles, so that the digestion efficiency is improved;
and step six, filtering and removing impurities from the ground and digested calcium hydroxide slurry by a filter screen, then sending the calcium hydroxide slurry into a centrifugal separator, controlling the rotating speed of the centrifugal separator, and separating the slurry into milky liquid calcium hydroxide with corresponding concentration and a clear liquid.
And adding a surfactant sodium dodecyl benzene sulfonate into the slurry in the grinding process in the fifth step. The addition amount of the surfactant is 0.5% of the addition amount of the calcium oxide. The addition of the surfactant can improve the interface compatibility between the calcium hydroxide particles and water and improve the grinding effect.
Example 2
A preparation method of liquid calcium hydroxide comprises the following steps:
step one, calcining, namely cleaning the surface of a limestone raw ore and then feeding the limestone raw ore into a lime kiln to calcine to obtain blocky calcium oxide;
removing impurities, namely removing calcium carbonate in calcium oxide by an infrared ray machine selection mode, and removing black impurities on the surface of the calcium oxide by a vibrating screen;
step three, crushing, namely introducing the treated blocky calcium oxide into a crusher to be crushed into small particles and then grinding the small particles into powder;
and step four, digesting, namely feeding calcium oxide powder into a spray type digestion reactor, adding water in a spray mode, stirring and reacting, wherein the mass ratio of the added water amount to the calcium oxide in the spray type digestion reactor is 1: 1, the reaction time in the spray digestion reactor is 30min,
step five, adding a size mixing liquid with the same amount of calcium oxide addition into the calcium hydroxide size obtained after preliminary digestion in the step four to prepare size, introducing the size into a vibration ball mill to grind for 4 hours to obtain a completely digested calcium hydroxide solution, wherein a grinding ball used in the ball mill is a zircon grinding ball with the diameter of 2mm, and the calcium hydroxide particles which are not completely digested are ground and agglomerated to fully contact the calcium oxide which is not completely digested with water, so that the digestion efficiency is improved;
and step six, filtering and removing impurities from the ground and digested calcium hydroxide slurry by a filter screen, then sending the calcium hydroxide slurry into a centrifugal separator, controlling the rotating speed of the centrifugal separator, and separating the slurry into liquid calcium hydroxide with corresponding concentration and clear liquid.
And the slurry mixing liquid used in the fifth step is prepared by adding water and a surfactant into the clear liquid separated in the sixth step according to the addition amount, wherein the surfactant is sodium dodecyl benzene sulfonate. Wherein the addition amount of the surfactant is 1.5% of the addition amount of the calcium oxide. The addition of the surfactant can improve the interface compatibility between the calcium hydroxide particles and water and improve the grinding effect.
Example 3
A preparation method of liquid calcium hydroxide comprises the following steps:
step one, calcining, namely cleaning the surface of a limestone raw ore and then feeding the limestone raw ore into a lime kiln to calcine to obtain blocky calcium oxide;
removing impurities, namely removing calcium carbonate in calcium oxide by an infrared ray machine selection mode, and removing black impurities on the surface of the calcium oxide by a vibrating screen;
step three, crushing, namely introducing the treated blocky calcium oxide into a crusher to be crushed into small particles and then grinding the small particles into powder;
and step four, digesting, namely feeding calcium oxide powder into a spray type digestion reactor, adding water in a spray mode, stirring and reacting, wherein the mass ratio of the added water amount to the calcium oxide in the spray type digestion reactor is 1: 1, the reaction time in the spray digestion reactor is 40min,
step five, adding a size mixing liquid with the same amount of calcium oxide addition into the calcium hydroxide size obtained after preliminary digestion in the step four to prepare size, introducing the size into a vibration ball mill to grind for 3 hours to obtain a completely digested calcium hydroxide solution, wherein a grinding ball used in the ball mill is a silicon carbide grinding ball with the diameter of 1mm, and the calcium oxide which is not completely digested is fully contacted with water by grinding and breaking up agglomerated calcium hydroxide particles, so that the digestion efficiency is improved;
and step six, filtering and removing impurities from the ground and digested calcium hydroxide slurry by a filter screen, then sending the calcium hydroxide slurry into a centrifugal separator, controlling the rotating speed of the centrifugal separator, and separating the slurry into liquid calcium hydroxide with corresponding concentration and clear liquid.
And the size mixing liquid used in the fifth step is prepared by adding sufficient water and a surfactant into the clear liquid separated in the sixth step according to the requirement, wherein the surfactant is stearic acid, and the addition amount of the surfactant is 1% of the addition amount of calcium oxide. The addition of the surfactant can improve the interface compatibility between the calcium hydroxide particles and water and improve the grinding effect.
In the above embodiments 1, 2 and 3, the vibration ball mill can drive the grinding balls to collide with each other at a high speed and rub each other at a high speed to grind calcium hydroxide particles to micron level by high-speed vibration, thereby performing digestion reaction deeply, completely removing unreacted calcium oxide particles in the system, and finally mixing calcium hydroxide solid obtained by a centrifugal separation mode with hydrated calcium hydroxide and a certain amount of water to obtain an emulsion product, wherein the separated clear liquid can be used as a slurry mixing raw material for recycling, water can not be added if the amount of the clear liquid generated in the recycling process is large, a surfactant can be directly added as the slurry mixing liquid, if the amount of the generated clear liquid is not enough, water can be added to the amount required by the process according to requirements, and then the surfactant is added to prepare the slurry mixing liquid, the liquid calcium hydroxide particles prepared by the above steps are fine and uniform, have high reaction speed, and can be widely used in the food industry, environmental protection water treatment, flue, and the time for standing and aging is reduced in the manufacturing process, the production efficiency is improved, the clear calcium hydroxide solution generated in the production process can be comprehensively utilized, and the environmental pollution and the resource waste are reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The preparation method of the liquid calcium hydroxide is characterized by comprising the following steps of:
step one, calcining, namely cleaning the surface of a limestone raw ore and then feeding the limestone raw ore into a lime kiln to calcine to obtain blocky calcium oxide;
removing impurities, namely removing calcium carbonate in calcium oxide by an infrared ray machine selection mode, and removing black impurities on the surface of the calcium oxide by a vibrating screen;
step three, crushing, namely introducing the treated blocky calcium oxide into a crusher to be crushed into small particles and then grinding the small particles into powder;
and step four, digesting, namely feeding calcium oxide powder into a digestion reactor, adding water and stirring, wherein the digestion in the digestion reactor is carried out for 30-45 min, and the mass ratio of the added water to the calcium oxide in the digestion reactor is 1: 1,
step five, adding the mixed slurry into the calcium hydroxide slurry obtained after the primary digestion in the step four according to the process requirements for secondary slurry preparation, and introducing the slurry into a ball mill for grinding for 2-4 hours;
and step six, filtering and removing impurities from the ground and digested calcium hydroxide slurry by a filter screen, then sending the calcium hydroxide slurry into a centrifugal separator, controlling the rotating speed of the centrifugal separator, and separating the slurry into clear liquid and liquid calcium hydroxide with corresponding concentration.
2. The method for preparing liquid calcium hydroxide according to claim 1, wherein the digestion reactor is a spray digestion reactor.
3. The method for preparing liquid calcium hydroxide according to claim 1, wherein the ball mill used in the fifth step is a vibratory ball mill.
4. The method for preparing liquid calcium hydroxide according to claim 3, wherein the material of the grinding balls in the wet ball mill is zircon, silicon carbide or corundum.
5. The method for preparing liquid calcium hydroxide according to claim 4, wherein the grinding balls have a diameter of 0.5 to 2 mm.
6. The method for preparing liquid calcium hydroxide according to claim 1, wherein the amount of the slurrying in the fifth step is not more than the initial amount of the calcium oxide.
7. The method for preparing liquid calcium hydroxide according to claim 1, wherein the size mixing liquid added in the fifth step is a mixture of the clear liquid obtained in the sixth step and water in any ratio.
8. The method for preparing liquid calcium hydroxide according to claim 7, wherein a surfactant is further added to the slurrying solution.
9. The method for preparing the superfine liquid calcium hydroxide according to claim 8, wherein the addition amount of the surfactant is 0.5-1.5% of the addition amount of the calcium oxide.
10. The method for preparing liquid calcium hydroxide according to claim 8, wherein the surfactant is stearic acid or sodium dodecylbenzenesulfonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010377620.2A CN111606581A (en) | 2020-05-07 | 2020-05-07 | Preparation method of liquid calcium hydroxide |
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| CN202010377620.2A CN111606581A (en) | 2020-05-07 | 2020-05-07 | Preparation method of liquid calcium hydroxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113307513A (en) * | 2021-06-18 | 2021-08-27 | 韩力 | Automatic change hydrated lime production facility |
| CN116282257A (en) * | 2023-03-21 | 2023-06-23 | 湖南耕石环境科技有限公司 | Nanoscale calcium-based active composite alkali and preparation method, preparation device and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113307513A (en) * | 2021-06-18 | 2021-08-27 | 韩力 | Automatic change hydrated lime production facility |
| CN116282257A (en) * | 2023-03-21 | 2023-06-23 | 湖南耕石环境科技有限公司 | Nanoscale calcium-based active composite alkali and preparation method, preparation device and application thereof |
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