CN111807402B - Preparation method of high-specific-surface-area calcium hydroxide for treating incineration waste - Google Patents

Preparation method of high-specific-surface-area calcium hydroxide for treating incineration waste Download PDF

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CN111807402B
CN111807402B CN202010574746.9A CN202010574746A CN111807402B CN 111807402 B CN111807402 B CN 111807402B CN 202010574746 A CN202010574746 A CN 202010574746A CN 111807402 B CN111807402 B CN 111807402B
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calcium hydroxide
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姚锡洪
陈俊平
吴晨
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Zhejiang Bushi New Material Co ltd
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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
    • C01F11/02—Oxides or hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • 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
    • C01P2006/12—Surface area

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Abstract

The invention relates to the field of calcium industry, in particular to a preparation method of calcium hydroxide with high specific surface area for treating incineration waste. The method comprises the following steps: adding a phosphoric acid donor into the starch slurry, adding clay particles, adjusting to acidity, stirring and reacting under a low-temperature heating condition until the mixture is viscous to form thick liquid; preparing soluble calcium salt solution, mixing the soluble calcium salt solution and the thick liquid, stirring for the first time, adding a precipitator, stirring for the second time, filtering out precipitate, and calcining the precipitate to obtain pre-powder; and (3) placing the pre-powder material in a slaker, acting the slaking water in the slaker on the pre-powder material in an atomization spraying mode, simultaneously stirring and slaking the pre-powder material, and obtaining the calcium hydroxide after slaking is completed. The invention can prepare the product with the specific surface area of 55m2Calcium hydroxide with high specific surface area of more than g; the dry desulfurization treatment effect of the tail gas generated after the waste incineration is excellent; the preparation method is simple and efficient.

Description

Preparation method of high-specific-surface-area calcium hydroxide for treating incineration waste
Technical Field
The invention relates to the field of calcium industry, in particular to a preparation method of high-specific-surface-area calcium hydroxide for treating incineration waste.
Background
In the process of burning garbage, a large amount of burning tail gas is usually generated, the burning tail gas contains harmful gases, and the harmful gases are usually treated by dry desulfurization, wet deacidification or co-combustion by adding a treating agent to remove acidic toxic and harmful gases in the harmful gases.
The common dry desulfurization treatment of tail gas generated after the incineration of garbage comprises calcium hydroxide, which can react with acid gas to realize the adsorption of the acid gas, but the existing calcium hydroxide has certain defects when being used for the incineration of garbage.
For example, the existing calcium hydroxide has limited specific surface area and poor absorption effect on acid gas, and the calcium hydroxide surface can absorb a large amount of acid gas in the treatment process, but the inner core part of the calcium hydroxide is difficult to be effectively utilized, the effective rate is low, and the removal efficiency is low.
In view of this, researchers in the field have attempted to develop a method for preparing calcium hydroxide powder having a higher specific surface area. For example, CN101774620B, an invention patent of a preparation method with high specific surface area for dry desulfurization, which obtains calcium hydroxide with high specific surface area by digesting after blending and calcining limestone and anthracite. The technical scheme can prepare superfine calcium hydroxide powder with the specific surface area of 15-30 m2The catalyst is used for dry desulphurization, but a certain lifting space still exists.
Disclosure of Invention
The invention provides a preparation method of calcium hydroxide with high specific surface area for incinerating garbage, which aims to solve the problems of low efficiency, poor effect, low utilization rate and the like in the dry desulfurization treatment of tail gas generated after incinerating garbage because the specific surface area of the existing calcium hydroxide is generally small.
The invention aims to:
1) can prepare calcium hydroxide powder with higher specific surface area which can reach 55m2More than g;
2) the preparation method is simple and efficient;
3) the catalyst has good use effect when being used for dry desulfurization treatment of tail gas generated after garbage incineration.
In order to achieve the purpose, the invention adopts the following technical scheme.
A preparation method of calcium hydroxide with high specific surface area for treating incineration waste,
the method comprises the following steps:
1) adding a phosphoric acid donor accounting for 32-35 wt% of the starch mass into 28-32 wt% of the starch slurry, adding clay particles accounting for 0.3-0.5 wt% of the starch mass, adjusting to be acidic, and stirring and reacting under a low-temperature heating condition until the mixture is viscous to form thick liquid;
2) preparing soluble calcium salt solution, mixing the soluble calcium salt solution and the thick liquid, stirring for the first time, adding a precipitator, stirring for the second time, filtering out precipitate, and calcining the precipitate to obtain pre-powder;
3) and (3) placing the pre-powder material in a slaker, acting the slaking water in the slaker on the pre-powder material in an atomization spraying mode, simultaneously stirring and slaking the pre-powder material, and obtaining the calcium hydroxide after slaking is completed.
In the method, firstly, thick liquid is prepared, the thick liquid contains carrier particles used as a template, the carrier particles take clay particles as cores, phosphoric acid modified starch shell layers with rich pore structures are formed on the surfaces of the clay particles through crosslinking, after the thick liquid and calcium salt solution are mixed, the phosphoric acid modified starch shell layers and the clay particles both have good adsorption effects on calcium ions and can be used as carriers to fully absorb and bear the calcium ions, a precipitator is added to effectively promote the precipitation and the forming of calcium to form insoluble calcium salt particles, and after the shell layers are removed through calcination, calcium oxide shell layers with a microporous structure and covered on the surfaces of the calcium oxide shell layers and the clay can be formed, so that the thick liquid has good structural stability, is not easy to generate excessive pulverization and has good specific surface area, and the phosphoric acid modified starch of the shell layers has obvious swelling property and can generate swelling when being mixed with the calcium salt solution, is more beneficial to the adsorption and deposition of calcium ions and the formation of more stable calcium hydroxide particles.
As a preference, the first and second liquid crystal compositions are,
in the step 1), the phosphate donor is sodium trimetaphosphate or phosphorus oxychloride;
the clay particles in the step 1) are D50Kaolin and/or montmorillonite particles with the diameter less than or equal to 3 mu m.
The calcium trimetaphosphate or the phosphorus oxychloride can be crosslinked with the starch, modify the starch and form a network structure, and can coat clay particles to form a network-shaped coating shell layer in the presence of the clay particles, so that the clay particles are controlled to be ultrafine kaolin and/or montmorillonite particles, and the particle size of the prepared calcium hydroxide powder can be further reduced.
As a preference, the first and second liquid crystal compositions are,
step 1) adjusting acidity to a pH value of 3.0-3.5;
step 1), the low-temperature heating temperature is 65-80 DEG C
The stirring reaction time of the step 1) is 5-6 h.
After the conditions are adjusted, a better preparation effect can be produced. The low temperature heating can promote the shaping of the shell layer.
As a preference, the first and second liquid crystal compositions are,
step 2), the soluble calcium salt solution is a calcium nitrate water solution, and the concentration is 50-60 g/L;
step 2) mixing the soluble calcium salt solution and the thick liquid according to the volume ratio of 1: (1.2-1.5);
and 2) one-time stirring time is 25-30 min.
Calcium nitrate is a common soluble calcium salt, has low cost, and is superior to other common soluble calcium salts such as calcium chloride and the like in the technical scheme of the invention through tests. Mixing and stirring the soluble calcium salt solution according to the proportion can ensure that the carrier particles fully expand to adsorb calcium ions and deposit to form calcium precipitates with rich pore structures.
As a preference, the first and second liquid crystal compositions are,
the precipitant in the step 2) is sodium carbonate or sodium bicarbonate;
step 2) adding excessive precipitant.
The addition of sodium carbonate and sodium bicarbonate can effectively promote the formation of stable precipitate of the adsorbed calcium and avoid the loss of calcium ions.
As a preference, the first and second liquid crystal compositions are,
and 2) carrying out secondary stirring for 15-20 min, standing for 5-10 min before secondary stirring, and setting the stirring speed to be 120-300 rpm.
The effective pre-precipitation effect can be formed by standing before the secondary stirring, namely the nucleation of the calcium precipitate is completed in the standing process, and the growth and fixation of the calcium precipitate can be promoted by low-speed stirring.
As a preference, the first and second liquid crystal compositions are,
step 3), the mass ratio of the digestion water to the pre-powder is 1: (3-4);
and 3) the air pressure in the digester is 0.06-0.065 MPa.
The digestion effect is good under the conditions, and calcium hydroxide can be effectively formed.
As a matter of preference,
and 3) controlling the stirring rotating speed to be 800-1200 rpm in the stirring and digesting process.
Clear up the process and adopt faster stirring rotational speed to stir, can improve and clear up efficiency and the effect of handling.
The invention has the beneficial effects that:
1) can prepare the product with the specific surface area of 55m2Calcium hydroxide with high specific surface area of more than g;
2) the dry desulfurization treatment effect of the tail gas generated after the waste incineration is excellent;
3) the preparation method is simple and efficient.
Detailed Description
The present invention will be described in further detail with reference to specific examples. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.
Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all those known to those skilled in the art.
Example 1
A method for preparing high specific surface area calcium hydroxide for use in incineration disposal, the method comprising:
1) adding phosphorus oxychloride with the mass of 33.3 percent of the starch into starch slurry with the mass of 30 percent of the starch slurry, and then adding phosphorus oxychloride with the mass of 0.4 percent of the starch slurry and phosphorus oxychloride with the mass of D50Adjusting the pH value of kaolin particles with the particle size less than or equal to 3 mu m to be about 3.2, and stirring and reacting at 70 ℃ for 6 hours until the kaolin particles are viscous to form thick liquid;
2) preparing 55g/L of calcium nitrate aqueous solution, and mixing the calcium nitrate aqueous solution and the thick liquid according to the volume ratio of 1: 1.35 for 30min, adding excessive sodium carbonate, standing for 10min, stirring at 180rpm for 20min, filtering out precipitate, and calcining the precipitate to constant weight to obtain pre-powdered material;
3) placing the pre-powder material in a digestion device, adjusting the air pressure in the digestion device to be 0.06MPa, and allowing digestion water in the digestion device to act on the pre-powder material in an atomization spraying manner, wherein the mass ratio of the digestion water to the pre-powder material is 1: and 3.5, stirring and digesting the pre-powdered material at 1000rpm, and obtaining the calcium hydroxide after digestion is completed.
Example 2
A method for preparing high specific surface area calcium hydroxide for use in incineration disposal, the method comprising:
1) adding sodium trimetaphosphate accounting for 33.3 wt% of the mass of the starch into 30 wt% of the starch slurry, and then adding 0.4 wt% and D of the mass of the starch50Adjusting the pH value of kaolin particles with the particle size less than or equal to 3 mu m to be about 3.2, and stirring and reacting at 70 ℃ for 6 hours until the kaolin particles are viscous to form thick liquid; 2) preparing 55g/L of calcium nitrate aqueous solution, and mixing the calcium nitrate aqueous solution and the thick liquid according to the volume ratio of 1: 1.35 for 30min, adding excessive sodium carbonate, standing for 10min, stirring at 180rpm for 20min, filtering out precipitate, and calcining the precipitate to constant weight to obtain pre-powdered material;
3) placing the pre-powder material in a slaker, adjusting the air pressure in the slaker to be 0.06MPa, and allowing slaking water in the slaker to act on the pre-powder material in an atomization spraying mode, wherein the mass ratio of the slaking water to the pre-powder material is 1: and 3.5, stirring and digesting the pre-powdered material at 1000rpm, and obtaining the calcium hydroxide after digestion is completed.
Example 3
A method for preparing high specific surface area calcium hydroxide for use in incineration disposal, the method comprising:
1) adding 35 wt% of sodium trimetaphosphate in the mass of starch into 32 wt% of starch slurry, and then adding 0.5 wt% of starch and D50Montmorillonite particles with a diameter less than or equal to 3 μm are adjusted to pH value of about 3.5, and stirred for reaction for 5h at 80 ℃ until the montmorillonite particles are viscous to form thick liquid;
2) preparing 60g/L calcium nitrate aqueous solution, and mixing the calcium nitrate aqueous solution and the thick liquid according to the volume ratio of 1: 1.5, stirring for 30min, adding excessive sodium bicarbonate, standing for 10min, stirring at 300rpm for 15min, filtering out precipitate, and calcining the precipitate to constant weight to obtain pre-powdered material;
3) placing the pre-powder material in a slaker, adjusting the air pressure in the slaker to be 0.065MPa, and allowing slaking water in the slaker to act on the pre-powder material in an atomization spraying mode, wherein the mass ratio of the slaking water to the pre-powder material is 1: and 4, simultaneously stirring and digesting the pre-powdered material at 1200rpm, and obtaining the calcium hydroxide after digestion is completed.
Example 4
A method for preparing high specific surface area calcium hydroxide for use in incineration disposal, the method comprising:
1) adding sodium trimetaphosphate accounting for 32 wt% of the starch mass into 28 wt% of the starch slurry, and then adding 0.3 wt% and D of the starch mass50Montmorillonite particles with the particle size less than or equal to 3 mu m are adjusted to the pH value of about 3.0, and stirred and reacted for 6 hours at the temperature of 65 ℃ until the montmorillonite particles are viscous to form thick liquid;
2) preparing 50g/L calcium nitrate aqueous solution, and mixing the calcium nitrate aqueous solution and the thick liquid according to the volume ratio of 1: 1.2, stirring for 25min, adding excessive sodium carbonate, standing for 5min, stirring at the rotating speed of 120rpm for 20min, filtering out precipitates, and calcining the precipitates to constant weight to obtain pre-powder;
3) placing the pre-powder material in a slaker, adjusting the air pressure in the slaker to be 0.06MPa, and allowing slaking water in the slaker to act on the pre-powder material in an atomization spraying mode, wherein the mass ratio of the slaking water to the pre-powder material is 1: and 3, simultaneously stirring and digesting the pre-powdered material at 800rpm, and obtaining the calcium hydroxide after digestion is completed.
Example 5
A method for preparing high specific surface area calcium hydroxide for use in incineration disposal, the method comprising:
1) adding phosphorus oxychloride with the mass of 35 wt% of the starch into starch slurry with the mass of 30 wt%, and then adding phosphorus oxychloride with the mass of 0.3 wt% of the starch and phosphorus oxychloride50Adjusting the pH value of kaolin less than or equal to 3 μm to about 3.2, and stirring at 75 deg.C for 6 hr until it is viscous to form thick liquid;
2) preparing 55g/L of calcium nitrate aqueous solution, and mixing the calcium nitrate aqueous solution and the thick liquid according to the volume ratio of 1: 1.5, stirring for 30min, adding excessive sodium carbonate, standing for 5min, stirring at 180rpm for 20min, filtering out precipitate, and calcining the precipitate to constant weight to obtain pre-powder;
3) placing the pre-powder material in a slaker, adjusting the air pressure in the slaker to be 0.065MPa, and allowing slaking water in the slaker to act on the pre-powder material in an atomization spraying mode, wherein the mass ratio of the slaking water to the pre-powder material is 1: and 4, simultaneously stirring and digesting the pre-powdered material at 1200rpm, and obtaining the calcium hydroxide after digestion is completed.
Example 6
A method for preparing high specific surface area calcium hydroxide for use in incineration disposal, the method comprising:
1) adding phosphorus oxychloride with the mass of 32 wt% of the starch into starch slurry with the mass of 30 wt%, and then adding phosphorus oxychloride with the mass of 0.3 wt% of the starch and phosphorus oxychloride50Adjusting the pH value of kaolin less than or equal to 3 μm to about 3.5, and stirring at 75 deg.C for 6 hr until it is viscous to form thick liquid;
2) preparing 55g/L of calcium nitrate aqueous solution, and mixing the calcium nitrate aqueous solution and the thick liquid according to the volume ratio of 1: 1.5, stirring for 30min, adding excessive sodium carbonate, standing for 10min, stirring at 180rpm for 20min, filtering out precipitate, and calcining the precipitate to constant weight to obtain pre-powder;
3) placing the pre-powder material in a slaker, adjusting the air pressure in the slaker to be 0.06MPa, and allowing slaking water in the slaker to act on the pre-powder material in an atomization spraying mode, wherein the mass ratio of the slaking water to the pre-powder material is 1: and 3.5, simultaneously stirring and digesting the pre-powdered material at 900rpm, and obtaining the calcium hydroxide after digestion is completed.
Comparative example 1
The specific procedure was the same as in example 1, except that: no clay particles are added.
Comparative example 2
The specific procedure was the same as in example 1, except that: the aqueous calcium nitrate solution was replaced with an aqueous calcium chloride solution.
Comparative example 3
The specific procedure was the same as in example 1, except that: no precipitant was added.
Comparative example 4
No standing treatment is carried out before the secondary stirring.
Testing
The calcium hydroxide powders prepared in examples 1 to 6 and comparative examples 1 to 4 were tested, and the tests included a specific surface area test and a dry desulfurization effect test. The specific surface area test is carried out by adopting a full-automatic BER specific surface area tester, and the test result is recorded by taking an average value of 5 effective measurements; the dry desulfurization effect detection is implemented by measuring the sulfur dioxide content in the flue gas, continuously testing, recording the effective use days (1d continuously discharging for 16h) of the tail gas composite tail gas discharge standard discharged in the continuous use process, recording the exceeding standard of the sulfur dioxide content in the tail gas discharged after treatment as failure, measuring the powder weight gain in the first day after failure to estimate the utilization rate, and simultaneously measuring the highest tail gas flow rate (10 m) of effective desulfurization under the condition of measuring different tail gas flow rates by using fresh loose calcium hydroxide powder (the length of an effective adsorption section is 1m)3H gradient test) to indirectly determine the using effect of the calcium hydroxide powder.
The specific test results are shown in table 1 below.
Table 1: test results
Figure BDA0002550583180000071
The same test comparison was carried out using a commercially available calcium hydroxide powder as a control 1 and the same test comparison was carried out using CN101774620B as a control 2, which is the same as the embodiment described in example 2.
The control group test results are as follows:
control group 1: BET test mean value of 9.4m3Per h, effective days 62day, utilization 67.4%, maximum tail gas flow rate 110m3H; control group 2: BET test mean of 21.4m3The effective days are 76day, the utilization rate is 84.9 percent, and the maximum tail gas flow rate is 190m3/h。
It is obvious from the above tests and comparisons that the specific surface area of the calcium hydroxide prepared by the technical scheme of the present invention is significantly improved compared with that of the calcium hydroxide of the control group 1 and the control group 2, and the adoption of the clay particles also has a large influence on the specific surface area of the calcium hydroxide, and a difference of about 18.6% in specific surface area is generated in the case of adding or not, and meanwhile, in terms of the effective days, the powder prepared by the calcium hydroxide powder sold in the market and the control group 2 is significantly inferior to that prepared by the present invention. For comparative example 2, it can be seen that the choice of calcium salt also has some effect on the product. In comparative examples 3 and 4, the area of the powder was increased to some extent when the powder was not allowed to stand sufficiently or the precipitant was not added, but the actual use effect was poor, and it is expected that the effective component actually contained in the powder was decreased, and the effect was rather decreased when the specific surface area was increased.

Claims (8)

1. A preparation method of calcium hydroxide with high specific surface area for treating incineration waste is characterized in that,
the method comprises the following steps:
1) adding a phosphoric acid donor accounting for 32-35 wt% of the starch mass into 28-32 wt% of the starch slurry, adding clay particles accounting for 0.3-0.5 wt% of the starch mass, adjusting to be acidic, and stirring and reacting under a low-temperature heating condition until the mixture is viscous to form thick liquid;
2) preparing soluble calcium salt solution, mixing the soluble calcium salt solution and the thick liquid, stirring for the first time, adding a precipitator, stirring for the second time, filtering out precipitate, and calcining the precipitate to obtain pre-powder;
3) and (3) placing the pre-powder material in a slaker, acting the slaking water in the slaker on the pre-powder material in an atomization spraying mode, simultaneously stirring and slaking the pre-powder material, and obtaining the calcium hydroxide after slaking is completed.
2. The method for preparing calcium hydroxide with high specific surface area for incinerating waste disposal according to claim 1,
in the step 1), the phosphate donor is sodium trimetaphosphate or phosphorus oxychloride;
adhesion in step 1)The soil particles are D50Kaolin and/or montmorillonite particles with the particle size less than or equal to 3 mu m.
3. The method for preparing calcium hydroxide with high specific surface area for incineration disposal according to claim 1 or 2,
step 1) adjusting acidity to a pH value of 3.0-3.5;
step 1), the low-temperature heating temperature is 65-80 DEG C
The stirring reaction time of the step 1) is 5-6 h.
4. The method for preparing calcium hydroxide with high specific surface area for incinerating waste disposal according to claim 1,
step 2), the soluble calcium salt solution is a calcium nitrate water solution, and the concentration is 50-60 g/L;
step 2) mixing the soluble calcium salt solution and the thick liquid according to the volume ratio of 1: (1.2-1.5);
and 2) carrying out primary stirring for 25-30 min.
5. The method for preparing calcium hydroxide with high specific surface area for incinerating garbage according to claim 1 or 4,
the precipitant in the step 2) is sodium carbonate or sodium bicarbonate;
step 2) adding excessive precipitant.
6. The method for preparing calcium hydroxide with high specific surface area for incinerating waste disposal according to claim 1,
and 2) carrying out secondary stirring for 15-20 min, standing for 5-10 min before secondary stirring, and setting the stirring speed to be 120-300 rpm.
7. The method for preparing calcium hydroxide with high specific surface area for incinerating waste disposal according to claim 1,
step 3), the mass ratio of the digestion water to the pre-powder is 1: (3-4);
and 3) the air pressure in the digester is 0.06-0.065 MPa.
8. The method for preparing calcium hydroxide with high specific surface area for incinerating garbage according to claim 1,
and 3) controlling the stirring rotating speed to be 800-1200 rpm in the stirring and digesting process.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101503208A (en) * 2009-03-13 2009-08-12 杭州稳健钙业有限公司 Process for preparing high concentration milky calcium hydroxide
CN101774620A (en) * 2009-12-31 2010-07-14 常熟大众钙化物有限公司 Method for preparing high-specific surface area calcium hydroxide for dry desulphurization
CN107603278A (en) * 2017-08-31 2018-01-19 贺州钟山县双文碳酸钙新材料有限公司 A kind of paper grade (stock) modified calcium carbonate and its processing technology
CN110078389A (en) * 2019-06-17 2019-08-02 邓金营 A kind of high response and high-specific surface area calcium hydroxide raw powder's production technology

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8999278B2 (en) * 2010-03-11 2015-04-07 The Board Of Trustees Of The University Of Illinois Method and apparatus for on-site production of lime and sorbents for use in removal of gaseous pollutants

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101503208A (en) * 2009-03-13 2009-08-12 杭州稳健钙业有限公司 Process for preparing high concentration milky calcium hydroxide
CN101774620A (en) * 2009-12-31 2010-07-14 常熟大众钙化物有限公司 Method for preparing high-specific surface area calcium hydroxide for dry desulphurization
CN107603278A (en) * 2017-08-31 2018-01-19 贺州钟山县双文碳酸钙新材料有限公司 A kind of paper grade (stock) modified calcium carbonate and its processing technology
CN110078389A (en) * 2019-06-17 2019-08-02 邓金营 A kind of high response and high-specific surface area calcium hydroxide raw powder's production technology

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