CN107098607A - A kind of production technology of active lime - Google Patents
A kind of production technology of active lime Download PDFInfo
- Publication number
- CN107098607A CN107098607A CN201710434918.0A CN201710434918A CN107098607A CN 107098607 A CN107098607 A CN 107098607A CN 201710434918 A CN201710434918 A CN 201710434918A CN 107098607 A CN107098607 A CN 107098607A
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- China
- Prior art keywords
- lime
- additive
- preparation
- production technology
- active lime
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Classifications
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Abstract
The invention discloses a kind of production technology of active lime, its step includes preparation, the preparation of additive, batch mixing, the calcining of limestone fines, that is, is worth active lime.The present invention has carried out major tuneup to conventional limestone burning process, sulfide in raw material more than 99% can be converted into sulfur dioxide and is together discharged in company with the gas of burning generation, in resulting product, sulfur content well below produced in conventional processes quick lime, while improving the activity of lime.Meanwhile, the present invention is improved to additive, and sodium metasilicate and boron oxide are added in additive, and sodium metasilicate mainly plays peptizaiton, and boron oxide can improve lime properties, and Activity of Lime can obtain large increase.Thus, the present invention improves the quality tool significance of quick lime for reduction energy resource consumption, production cost.
Description
Technical field
The invention belongs to construction material technical field of producing, and in particular to a kind of production technology of active lime.
Background technology
With lime fine chemistry industry, medical and health, field of food extensive use, its cost price is cheap, free settling
Separate residue, specific surface area big, active high, production process is fast, has obtained relevant industries abundant affirmation.Lime production primary raw material
It is calcium carbonate, its cracking reaction equation is：CaCO3====CaO+CO2；The content of its calcium carbonate directly affects lime after calcining
Quality, the height of its impurity content, particularly smelting, the sulphur of fine chemical product, carbon, phosphorus, lead, arsenic, cadmium and chromium etc. are contained
The influence of amount is huge.
Chinese patent CN103073204A discloses a kind of energy-conservation preparation method of quick lime, and this method includes preparing lime
Stone fine powder, prepare additive, prepare lime stone idiosome, fire four steps.Compared with existing quick lime method for cooking, using this
Invention can save more than 70% energy, with significant economy and social value, for reduction energy resource consumption, improve enterprise
Benefit, with remarkable effect.Meanwhile, prepared quick lime activity degree is higher, and product quality is significantly improved.Chinese patent
CN103172283A provide a kind of low-carbon active lime method for calcinating, by limestone particle feeding preheater preheating 40 ±
5min, the surface and central temperature for making limestone particle all reaches after 800~850 DEG C that feeding rotary kiln kiln body is warming up to again
850 DEG C~1000 DEG C, afterwards, it is not more than the clinkering zone that 35m, temperature are 1000~1200 DEG C in length and burns till low-carbon high activity stone
Ash.This method for calcinating improves decomposition of limestone speed, reduces thermal losses, improves fuel availability, economizes on resources；Preheating
Stage only will be preheating to it and decompose critical-temperature inside and outside limestone particle, be brought rapidly up not only making to reach inside particle in clinkering zone
To beneficial to CO2The high temperature of discharge, reduces CO in lime2Residual quantity, and external temperature too high will not make the burning of lime surface
There is " closely knit " layer or " porcelain " layer stops CO2Effusion.
Metallurgy lime is that steel produces important flux and slag making materials, as national industry-by-industry is carried to steel product quality requirement
The converter producing of height, particularly special steel proposes higher requirement to metallurgy lime, and being proposed in industry will >=92% oxidation
Calcium, >=350ml activity degrees ,≤0.02% sulfur content lime, that is, require to use active lime.Using low power consuming, production energy-conservation
Environmental protection and direction of the lime as following development with high activity, and necessarily there are good market prospects.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of production technology of active lime, and the sulfur content of preparation is low, and
It is active high.
The technical solution adopted by the present invention is as follows：
A kind of production technology of active lime, comprises the following steps：
（1）The preparation of limestone fines：Agstone is broken into powder, sieves, obtains limestone fines, it is standby；
（2）The preparation of additive：Take coal dust, sodium metasilicate and boron oxide respectively, be mixed it is uniform, wherein coal dust, sodium metasilicate and
Boron oxide mass ratio is 10:4:3~10:2:1；
（3）Batch mixing：By step（1）The limestone fines and step of preparation（2）The additive of preparation is uniformly mixed, and must be mixed
Material, the wherein mass ratio of limestone fines and additive are 100:2~100:0.3；
（4）Calcining：By step（3）In compound feeding kiln body in calcine, calcining heat be 1120 DEG C~1200 DEG C, during calcining
Between be 1.5h~2h, the rotating speed of rotary kiln is the r/min of 5 r/min~8.
It is preferred that, the step（1）The middle mesh sieve of mistake 100.
It is preferred that, the step（2）The wt% of middle coal powder fraction≤6, granularity is 200 mesh.
It is preferred that, the step（2）Middle coal dust, sodium metasilicate and boron oxide mass ratio are 10:2.5:1.5.
It is preferred that, the step（3）The mass ratio of middle limestone fines and additive is 100:0.8
It is preferred that, the step（2）Middle calcining heat is 1160 DEG C, and calcination time is 1.6h, and the rotating speed of rotary kiln is 6 r/
min。
Beneficial effect：
The sulfide that the present invention has been carried out to conventional limestone burning process in major tuneup, raw material more than 99% can be converted into
The gas that sulfur dioxide is produced in company with burning is together discharged, in resulting product, and sulfur content is given birth to well below conventional method
The quick lime of production, while the activity of lime is improved, when being applied to STEELMAKING PRODUCTION, it is possible to increase temperature during steel-making, is carried
High slag discharge efficiency, reduces quick lime consumption, improves the quality of product steel, reduces STEELMAKING PRODUCTION cost, reduces the wasting of resources and right
The pollution of environment.Meanwhile, the present invention is improved to additive, and sodium metasilicate and boron oxide, silicon are added in additive
Sour sodium mainly plays peptizaiton, and boron oxide can improve lime properties, and Activity of Lime can obtain large increase.Thus, this
Invention improves the quality tool significance of quick lime for reduction energy resource consumption, production cost.
Embodiment
The present invention is further described in detail below by specific embodiment, but is not limited to this.
Embodiment 1
A kind of production technology of active lime, comprises the following steps：
（1）The preparation of limestone fines：Agstone is broken into powder, 100 mesh sieves is crossed, obtains limestone fines, it is standby；
（2）The preparation of additive：Coal dust, sodium metasilicate and boron oxide are taken respectively, are mixed uniformly, wherein coal powder fraction≤6
Wt%, granularity is 200 mesh, and coal dust, sodium metasilicate and boron oxide mass ratio are 10:4:3；
（3）Batch mixing：By step（1）The limestone fines and step of preparation（2）The additive of preparation is uniformly mixed, and must be mixed
Material, the wherein mass ratio of limestone fines and additive are 100:0.3；
（4）Calcining：By step（3）In compound feeding kiln body in calcine, calcining heat be 1120 DEG C, calcination time is 2h,
The rotating speed of rotary kiln is 5 r/min.
Embodiment 2
A kind of production technology of active lime, comprises the following steps：
（1）The preparation of limestone fines：Agstone is broken into powder, 100 mesh sieves is crossed, obtains limestone fines, it is standby；
（2）The preparation of additive：Coal dust, sodium metasilicate and boron oxide are taken respectively, are mixed uniformly, wherein coal powder fraction≤6
Wt%, granularity is 200 mesh, and coal dust, sodium metasilicate and boron oxide mass ratio are 10:2:1；
（3）Batch mixing：By step（1）The limestone fines and step of preparation（2）The additive of preparation is uniformly mixed, and must be mixed
Material, the wherein mass ratio of limestone fines and additive are 100:2；
（4）Calcining：By step（3）In compound feeding kiln body in calcine, calcining heat is 1200 DEG C, and calcination time is
1.5h, the rotating speed of rotary kiln is 8 r/min.
Embodiment 3
A kind of production technology of active lime, comprises the following steps：
（1）The preparation of limestone fines：Agstone is broken into powder, 100 mesh sieves is crossed, obtains limestone fines, it is standby；
（2）The preparation of additive：Coal dust, sodium metasilicate and boron oxide are taken respectively, are mixed uniformly, wherein coal powder fraction≤6
Wt%, granularity is 200 mesh, and coal dust, sodium metasilicate and boron oxide mass ratio are 10:3:2；
（3）Batch mixing：By step（1）The limestone fines and step of preparation（2）The additive of preparation is uniformly mixed, and must be mixed
Material, the wherein mass ratio of limestone fines and additive are 100:1.2；
（4）Calcining：By step（3）In compound feeding kiln body in calcine, calcining heat is 1140 DEG C, and calcination time is
1.8h, the rotating speed of rotary kiln is 7r/min.
Embodiment 4
A kind of production technology of active lime, comprises the following steps：
（1）The preparation of limestone fines：Agstone is broken into powder, 100 mesh sieves is crossed, obtains limestone fines, it is standby；
（2）The preparation of additive：Coal dust, sodium metasilicate and boron oxide are taken respectively, are mixed uniformly, wherein coal powder fraction≤6
Wt%, granularity is 200 mesh, and coal dust, sodium metasilicate and boron oxide mass ratio are 10:2.5:1.5；
（3）Batch mixing：By step（1）The limestone fines and step of preparation（2）The additive of preparation is uniformly mixed, and must be mixed
Material, the wherein mass ratio of limestone fines and additive are 100:0.8；
（4）Calcining：By step（3）In compound feeding kiln body in calcine, calcining heat is 1160 DEG C, and calcination time is
1.6h, the rotating speed of rotary kiln is 6 r/min.
Comparative example
A kind of production technology of active lime, comprises the following steps：
（1）The preparation of limestone fines：Agstone is broken into powder, 100 mesh sieves is crossed, obtains limestone fines, it is standby；
（2）The preparation of additive：Coal dust and sodium metasilicate are taken respectively, are mixed uniform, the wherein wt% of coal powder fraction≤6, granularity
For 200 mesh, coal dust and sodium metasilicate mass ratio are 10:2.5；
（3）Batch mixing：By step（1）The limestone fines and step of preparation（2）The additive of preparation is uniformly mixed, and must be mixed
Material, the wherein mass ratio of limestone fines and additive are 100:0.8；
（4）Calcining：By step（3）In compound feeding kiln body in calcine, calcining heat is 1160 DEG C, and calcination time is
1.6h, the rotating speed of rotary kiln is 6 r/min.
Physicochemical property is carried out using the DL/T 1483-2015 lime prepared to above-described embodiment 1 to 4 and comparative example and performance is surveyed
Examination, its result is as shown in the table：
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Comparative example |
| CaO（wt%） | 94.5 | 93.6 | 96.8 | 98.3 | 88.7 |
| C（wt%） | 0.11 | 0.08 | ＜ 0.01 | ＜ 0.01 | 0.56 |
| S（wt%） | 0.04 | 0.03 | ＜ 0.01 | ＜ 0.01 | 0.24 |
| Activity degree（mL） | 490 | 487 | 506 | 512 | 416 |
As can be seen from the above table, the indices of embodiment 1 to 4 are superior to comparative example, and comparative example goes not being with embodiment 4,
The additive used in embodiment 4 adds the additive used in boron oxide, two comparative examples and does not add boron oxide, embodiment
4 compared to comparative example, and CaO content improves about 10%, and activity degree improves about 100mL, and C, S content are substantially reduced, and are said
It is bright to improve the performance of lime in additive addition boron oxide, obtain the lime of high activity degree.In addition, present invention uses a variety of
Additive simultaneously defines that it is matched, and reduce further power consumption, improves the activity degree of lime, in rotary kiln production process, kiln
Speed is also the factor of very crux to product quality, using different kilns speed, makes lime stone number of revolutions, high temperature in kiln in kiln
Action time etc. is connected, and using quick burning method, the activity degree of lime is improved to more than 480mL, has obtained active lime.
Claims (6)
1. a kind of production technology of active lime, it is characterised in that comprise the following steps：
（1）The preparation of limestone fines：Agstone is broken into powder, sieves, obtains limestone fines, it is standby；
（2）The preparation of additive：Take coal dust, sodium metasilicate and boron oxide respectively, be mixed it is uniform, wherein coal dust, sodium metasilicate and
Boron oxide mass ratio is 10:4:3~10:2:1；
（3）Batch mixing：By step（1）The limestone fines and step of preparation（2）The additive of preparation is uniformly mixed, and must be mixed
Material, the wherein mass ratio of limestone fines and additive are 100:2~100:0.3；
（4）Calcining：By step（3）In compound feeding kiln body in calcine, calcining heat be 1120 DEG C~1200 DEG C, during calcining
Between be 1.5h~2h, the rotating speed of rotary kiln is the r/min of 5 r/min~8.
2. the production technology of active lime according to claim 1, it is characterised in that the step（1）The middle mesh sieve of mistake 100.
3. the production technology of active lime according to claim 1, it is characterised in that the step（2）Middle coal powder fraction≤
6 wt%, granularity is 200 mesh.
4. the production technology of active lime according to claim 1, it is characterised in that the step（2）Middle coal dust, silicic acid
Sodium and boron oxide mass ratio are 10:2.5:1.5.
5. the production technology of active lime according to claim 1, it is characterised in that the step（3）Middle limestone fines
Mass ratio with additive is 100:0.8.
6. the production technology of active lime according to claim 1, it is characterised in that the step（2）Middle calcining heat is
1160 DEG C, calcination time is 1.6h, and the rotating speed of rotary kiln is 6 r/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710434918.0A CN107098607A (en) | 2017-06-10 | 2017-06-10 | A kind of production technology of active lime |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710434918.0A CN107098607A (en) | 2017-06-10 | 2017-06-10 | A kind of production technology of active lime |
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| CN107098607A true CN107098607A (en) | 2017-08-29 |
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| CN201710434918.0A Pending CN107098607A (en) | 2017-06-10 | 2017-06-10 | A kind of production technology of active lime |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467211A (en) * | 2018-06-19 | 2018-08-31 | 郑小华 | A kind of active lime and its production technology |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5421994A (en) * | 1977-07-20 | 1979-02-19 | Midori Inoue | Mass production of small coal blocks from powder coal |
| CN1827752A (en) * | 2005-03-04 | 2006-09-06 | 郑恒春 | Novel fuel with limestone as main component and preparation method thereof |
| CN101643325A (en) * | 2009-09-03 | 2010-02-10 | 湖北和石钙业发展有限公司 | Preparation method of low-sulfur low-carbon active lime |
| 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 |
-
2017
- 2017-06-10 CN CN201710434918.0A patent/CN107098607A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5421994A (en) * | 1977-07-20 | 1979-02-19 | Midori Inoue | Mass production of small coal blocks from powder coal |
| CN1827752A (en) * | 2005-03-04 | 2006-09-06 | 郑恒春 | Novel fuel with limestone as main component and preparation method thereof |
| CN101643325A (en) * | 2009-09-03 | 2010-02-10 | 湖北和石钙业发展有限公司 | Preparation method of low-sulfur low-carbon active lime |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 郭汉杰: "《活性石灰生产理论与工艺》", 30 April 2014, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467211A (en) * | 2018-06-19 | 2018-08-31 | 郑小华 | A kind of active lime and its production technology |
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