CN109956684B - Production method of ultra-low potassium active fine lime - Google Patents
Production method of ultra-low potassium active fine lime Download PDFInfo
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- CN109956684B CN109956684B CN201711499850.0A CN201711499850A CN109956684B CN 109956684 B CN109956684 B CN 109956684B CN 201711499850 A CN201711499850 A CN 201711499850A CN 109956684 B CN109956684 B CN 109956684B
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 65
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 65
- 239000004571 lime Substances 0.000 title claims abstract description 65
- 229910052700 potassium Inorganic materials 0.000 title claims abstract description 28
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000011591 potassium Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 235000019738 Limestone Nutrition 0.000 claims abstract description 47
- 239000006028 limestone Substances 0.000 claims abstract description 47
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 238000001354 calcination Methods 0.000 claims abstract description 15
- 239000004094 surface-active agent Substances 0.000 claims abstract description 15
- 239000011593 sulfur Substances 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000012958 reprocessing Methods 0.000 claims abstract description 6
- 239000011265 semifinished product Substances 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000292 calcium oxide Substances 0.000 claims abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000002270 dispersing agent Substances 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 12
- 238000012216 screening Methods 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000002802 bituminous coal Substances 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 5
- 239000000194 fatty acid Substances 0.000 claims description 5
- 229930195729 fatty acid Natural products 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- -1 sodium fatty acid Chemical class 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 238000005188 flotation Methods 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000012634 fragment Substances 0.000 claims 1
- 239000011148 porous material Substances 0.000 claims 1
- 230000036632 reaction speed Effects 0.000 claims 1
- 239000004576 sand Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 5
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 4
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 239000012847 fine chemical Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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
- C04B2/10—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
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/108—Treatment or selection of the fuel therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention provides a production method of ultra-low potassium active refined lime, which is characterized by comprising the steps of preparing a surfactant, pretreating raw materials, preheating, calcining and reprocessing semi-finished products to obtain the ultra-low potassium active refined lime. The invention can effectively remove silt and impurities of the limestone by controlling the granularity of the crushed limestone and adding the surfactant to screen, float and wash the limestone raw material, thereby greatly reducing the introduction of K into the limestone raw material+、SO42‑And Cl‑And the content of harmful impurities; the activity of the prepared ultra-low potassium refined lime is improved to more than 430ml, the content of calcium oxide is more than or equal to 92 percent, harmful elements such as sulfur content is less than 0.01 percent, carbon content is less than 0.02 percent, and K is+≤100ppm、SO42‑≤400ppm、Cl‑Less than or equal to 10ppm, and the 325-mesh passing rate of the grinding active fine lime is more than 95 percent.
Description
Technical Field
The invention belongs to the technical field of chemical smelting, and particularly relates to a production method of ultra-low potassium active fine lime.
Background
The active refined lime with ultralow potassium content is a main and necessary raw material for producing high-end sodium hypophosphite, and the sodium hypophosphite is an ideal reducing agent and is mainly used for chemical nickel plating, copper and tin plating, preparation of organic synthesis catalysts, food processing and fresh keeping, engineering plastic stabilizers and the like. The chemical industry requires that the calcium oxide is more than or equal to 92 percent, the activity degree is more than or equal to 350ml, the sulfur content is less than or equal to 0.01 percent, the carbon content is less than or equal to 0.02 percent, and the K is+≤100ppm、SO42- ≤400ppm、Cl- Less than or equal to 10ppm, the 325-mesh pass rate of the ground active fine lime is more than 95 percent, the effective calcium content and the activity of the lime are high, the content of harmful impurities in the lime is low, the active lime produced at present can meet the requirements of other industries in the aspects of calcium oxide, sulfur, carbon content and activity, but the harmful impurities such as K are contained in the active lime+、SO42-、Cl-The method can not meet the requirements of the field of fine chemical new materials and is used for preparing the new materials such as high-end sodium hypophosphite and raw materials of PVC heat stabilizerAnd (4) requiring.
Chinese patent ZL201510231514.2 discloses a method for producing high-efficiency active lime, which comprises washing limestone raw material with water, removing silt, other impurities and crushed stone therein, pulverizing, and sieving; then adding the prepared additive (dispersing agent, coupling agent, chlorate and the like which are uniformly mixed) and the raw material limestone into a mixer for uniformly mixing; secondly, preheating the limestone mixture at 680-720 ℃ for 5-10 min; and finally, feeding the preheated limestone mixture into a rotary kiln body, wherein the rotating speed of the rotary kiln is 2.7-3.2 r/min, the temperature is raised to 1210-1300 ℃ by adopting bituminous coal spraying, and the calcining time is 200 min. And cooling the calcined lime to obtain a finished product. The method has the following defects: harmful impurity elements are not thoroughly removed in the processes of crushing, washing and screening raw materials; meanwhile, the control of the technological parameters such as the calcining temperature, the calcining time, the kiln rotating speed and the like in the calcining process is unreasonable, so that harmful impurity elements such as K in the lime discharged from the kiln are easily caused+、SO42- 、Cl-The content is high, and the application of the active lime in the production of new fine chemical material products cannot be met.
Disclosure of Invention
The invention aims to provide a production method of ultra-low potassium active refined lime, aiming at reducing harmful element K in active lime+、SO42-The content of impurities.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a production method of ultra-low potassium active fine lime comprises the following steps:
step 1) preparation of a surfactant: weighing sodium fatty acid, sodium carbonate and a dispersing agent in a mass ratio of 1:1:1:1 to mix into a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening limestone as a raw material; flotation and washing are carried out on the raw materials by adding the surfactant prepared in the step 1), so that impurities such as silt and lime chips of the limestone raw materials are completely removed, and meanwhile, part of harmful elements in the raw materials are removed;
step 3), preheating: preheating the limestone in the step 2), wherein the temperature is 680-720 ℃, and the preheating time is 220-260 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotating speed of the rotary kiln is 0.57-0.77 r/min, the temperature is raised to 1350-; rapidly cooling the discharged lime in a vertical preheater by adopting a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), adding a chelating dispersant, grinding and winnowing to obtain the ultra-low potassium refined lime.
Further, the dispersant in the step 1) is a synthetic high molecular polymer or a chelating dispersant.
Further, the particle size of the limestone raw material in the step 2) is 10-30 mm.
Further, the dosage of the surfactant in the step 2) is 8.0-12.0 ten thousandth of the mass of the limestone.
Further, the preheating temperature in the step 3) is 700-; preferably, the preheating temperature is 700 ℃ and the preheating time is 240 min.
Preferably, the rotating speed of the rotary kiln in the step 4) is 0.67 r/min; feeding into rotary kiln, heating to 1400 deg.C, and calcining for 90 min.
Furthermore, in the step 4), the bituminous coal is prepared from less than or equal to 0.5wt% of sulfur, more than or equal to 35wt% of volatile matter, less than or equal to 8wt% of ash, more than or equal to 6000J/kg of heat productivity, less than or equal to 5wt% of pulverized coal fineness, less than or equal to 1 wt% of water and 200 meshes of particle size.
Further, the chelating dispersant added in the step 5) is 1.0-3.0 ten thousandth of the mass of lime.
Further, the activity of the ultra-low potassium refined lime is improved to more than 430ml, the content of calcium oxide is more than or equal to 92 percent, harmful elements such as sulfur content is less than 0.01 percent, carbon content is less than 0.02 percent, and K is added+≤100ppm、SO42- ≤400ppm、Cl-Less than or equal to 10ppm, and the 325-mesh passing rate of the grinding active fine lime is more than 95 percent.
The invention has the following beneficial effects:
1. by controlling the granularity of the crushed limestone and adding the surfactant to screen, float and wash the limestone raw material, the silt and impurities of the limestone can be effectively removed, and the introduction of K into the limestone raw material is greatly reduced+、SO42-And Cl-And the content of harmful impurities.
2. The production process has the advantages that the low-sulfur, high-volatile and low-ash bituminous coal is ground into 200-mesh coal powder, the spray combustion technology and the slow calcining method are adopted, the kiln speed is controlled to be 0.57-0.77 r/min, and the produced active lime has high effective calcium content and high activity.
3. By sieving and separating the semi-finished active lime, adding a dispersant for grinding and winnowing, the activity, the dispersibility and the fluidity of the refined lime are further improved, and the K in the active lime is reduced+、SO42-And Cl-Harmful element content, and is favorable for pneumatic transmission.
4. The prepared ultra-low potassium active fine lime can be used as a raw material for professional production of high-end sodium hypophosphite in the field of fine chemical engineering.
Detailed Description
The invention is illustrated below with reference to specific examples.
Example 1
A production method of ultra-low potassium active fine lime comprises the following steps:
step 1) preparation of a surfactant: weighing sodium aliphatate, fatty acid, sodium carbonate and chelating dispersant in a mass ratio of 1:1:1:1, and mixing to obtain a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening raw limestone, and floating and washing the raw limestone by adding a surfactant with the mass of 10.0 ten-thousandth of the mass of the limestone, so that impurities such as silt, lime chips and the like of the raw limestone are completely removed, and meanwhile, part of harmful elements in the raw material are removed; selecting limestone with the granularity of 20 mm;
step 3), preheating: preheating the limestone in the step 2) at 700 ℃ for 240 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotary speed of the rotary kiln is 0.67 r/min, the temperature is raised to 1400 ℃ by adopting bituminous coal spraying, and the calcining time is 90 min; rapidly cooling the discharged lime in a vertical preheater by adopting a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), adding a chelating dispersant with the mass of 2.0 ten thousandth of the lime, grinding, and winnowing to obtain the ultra-low potassium refined lime.
In the step 4), the bituminous coal is prepared from less than or equal to 0.5wt% of sulfur, more than or equal to 35wt% of volatile components, less than or equal to 8wt% of ash, more than or equal to 6000J/kg of heat productivity, less than or equal to 5wt% of pulverized coal fineness, less than or equal to 1 wt% of water and 200 meshes of particle size.
Example 2
A production method of ultra-low potassium active fine lime comprises the following steps:
step 1) preparation of a surfactant: weighing sodium aliphatate, fatty acid, sodium carbonate and chelating dispersant in a mass ratio of 1:1:1:1, and mixing to obtain a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening raw limestone, and floating and washing the raw limestone by adding a surfactant with the mass of 12.0 ten-thousandth of the mass of the limestone, so that impurities such as silt, lime chips and the like of the raw limestone are completely removed, and meanwhile, part of harmful elements in the raw material are removed; selecting limestone with the granularity of 30 mm;
step 3), preheating: preheating the limestone in the step 2) at 720 ℃ for 260 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotary speed of the rotary kiln is 0.77 r/min, the temperature is raised to 1450 ℃ by adopting bituminous coal spraying, and the calcining time is 100 min; rapidly cooling the discharged lime in a vertical preheater by adopting a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), and then adding 3.0 ten-thousandth of the mass of the lime for grinding and winnowing to obtain the ultra-low potassium refined lime.
In the step 4), the bituminous coal is prepared from less than or equal to 0.5wt% of sulfur, more than or equal to 35wt% of volatile components, less than or equal to 8wt% of ash, more than or equal to 6000J/kg of heat productivity, less than or equal to 5wt% of pulverized coal fineness, less than or equal to 1 wt% of water and 200 meshes of particle size.
Example 3
A production method of ultra-low potassium active fine lime comprises the following steps:
step 1) preparation of a surfactant: weighing sodium aliphatate, fatty acid, sodium carbonate and chelating dispersant in a mass ratio of 1:1:1:1 to mix into a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening raw limestone, and floating and washing the raw limestone by adding 10 ten-thousandth of surfactant of the mass of the limestone, so as to completely remove impurities such as silt, lime chips and the like of the raw limestone and remove part of harmful elements in the raw material; selecting limestone with the granularity of 20 mm;
step 3), preheating: preheating limestone in the step 2), wherein the temperature is 710 ℃, and the preheating time is 220 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotary speed of the rotary kiln is 0.67 r/min, the temperature is raised to 1420 ℃ by adopting bituminous coal spraying, and the calcining time is 85 min; rapidly cooling the discharged lime in a vertical preheater by adopting a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), and then adding 1.5 ten-thousandth of the mass of the lime for grinding and winnowing to obtain the ultra-low potassium refined lime.
In the step 4), the bituminous coal is prepared from less than or equal to 0.5wt% of sulfur, more than or equal to 35wt% of volatile components, less than or equal to 8wt% of ash, more than or equal to 6000J/kg of heat productivity, less than or equal to 5wt% of pulverized coal fineness, less than or equal to 1 wt% of water and 200 meshes of particle size.
The physicochemical data of the raw materials of examples 1 to 3 are shown in Table 1, and the physicochemical test data of the prepared refined lime are shown in Table 2.
TABLE 1 physicochemical data for limestone
TABLE 2 physicochemical test data of the prepared lime
Claims (7)
1. The production method of the ultra-low potassium active fine lime is characterized by comprising the following steps:
step 1) preparation of a surfactant: weighing sodium fatty acid, sodium carbonate and a dispersing agent in a mass ratio of 1:1:1:1 to mix into a uniform solution;
step 2) raw material pretreatment: crushing, floating, washing and screening limestone as a raw material; flotation and washing are carried out on the raw materials by adding the surfactant prepared in the step 1), so that sand, lime stone fragments and other impurities of the lime stone raw materials are completely removed, and meanwhile, part of harmful elements in the raw materials are removed;
step 3), preheating: preheating the limestone in the step 2), wherein the preheating temperature is 680-720 ℃, and the preheating time is 220-260 min;
step 4) calcining: feeding the preheated limestone in the step 3) into a rotary kiln body, wherein the rotating speed of the rotary kiln is 0.57-0.77 r/min, the temperature is raised to 1350-; rapidly cooling the discharged lime in a vertical cooler in a forced air supply mode;
step 5), reprocessing of semi-finished products: screening the semi-finished active lime in the step 4), adding a chelating dispersant, grinding and winnowing to obtain the ultra-low potassium refined lime.
2. The method for producing active refined lime with ultra-low potassium as claimed in claim 1, wherein the particle size of the limestone raw material in step 2) is 10-30 mm.
3. The method for producing active refined lime with ultra-low potassium content as claimed in claim 1, wherein the amount of the surfactant used in step 2) is 8.0-12.0 ten-thousandths of the mass of the limestone.
4. The method for producing the ultra-low potassium active fine lime according to claim 1, wherein in the step 4), bituminous coal is used with sulfur of not more than 0.5wt%, volatile components of not less than 35wt%, ash of not more than 8wt%, calorific value of not less than 6000J/kg, coal fines of not more than 5wt%, water of not more than 1 wt%, and particle size of 200 mesh.
5. The method for producing refined lime with ultra-low potassium activity as claimed in claim 1, wherein the chelating dispersant added in step 5) is 1.0-3.0 ten thousandths of the lime mass.
6. The method for producing ultra-low potassium active refined lime according to claim 1, wherein the dispersant is a synthetic high molecular polymer or a chelating dispersant.
7. The method for producing active refined lime with ultra-low potassium content as claimed in claim 1, wherein the active degree of the active refined lime with ultra-low potassium content is high, the content of available calcium is large, the internal pore space is large, the reaction speed is fast, the content of harmful impurity elements is low, specifically, the active degree is increased to more than 430ml, the content of available calcium oxide is more than or equal to 92%, the sulfur content is less than 0.01%, the carbon content is less than 0.02%, K is less than K+≤100ppm、SO42- ≤ 400ppm、Cl-Less than or equal to 10 ppm; the specific surface area of the grinding active refined lime is large, and the passing rate of a 325-mesh sieve is more than 95 percent.
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04193746A (en) * | 1990-11-26 | 1992-07-13 | Osaka Koukai Kk | Hard burnt lime granular body and its manufacture and method for using the same to heat insulation of high temperature molten metal |
CN104844020A (en) * | 2015-05-08 | 2015-08-19 | 湖南衡山皕成钙业有限公司 | Method for producing high-efficient active lime |
CN107206393A (en) * | 2014-12-01 | 2017-09-26 | 德国钾盐集团股份有限公司 | The method of collecting agent selective floation kainite from mineral intermixture is used as by the use of sulfated fatty acid |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04193746A (en) * | 1990-11-26 | 1992-07-13 | Osaka Koukai Kk | Hard burnt lime granular body and its manufacture and method for using the same to heat insulation of high temperature molten metal |
CN107206393A (en) * | 2014-12-01 | 2017-09-26 | 德国钾盐集团股份有限公司 | The method of collecting agent selective floation kainite from mineral intermixture is used as by the use of sulfated fatty acid |
CN104844020A (en) * | 2015-05-08 | 2015-08-19 | 湖南衡山皕成钙业有限公司 | Method for producing high-efficient active lime |
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