CN103412114B - Quality comprehensive analysis method for limestone raw materials used in sleeve kiln - Google Patents
Quality comprehensive analysis method for limestone raw materials used in sleeve kiln Download PDFInfo
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- CN103412114B CN103412114B CN201310327190.3A CN201310327190A CN103412114B CN 103412114 B CN103412114 B CN 103412114B CN 201310327190 A CN201310327190 A CN 201310327190A CN 103412114 B CN103412114 B CN 103412114B
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Abstract
The invention discloses a quality comprehensive analysis method for limestone raw materials used in a sleeve kiln. According to the quality comprehensive analysis method, the quality conditions of the limestone raw materials can be accurately analyzed through multi-step analysis and screening, so as to screen out high-class limestone raw materials and provide a powerful guarantee for the stable production of the sleeve kiln. The quality comprehensive analysis method comprises the following steps: appearance quality inspection, analysis to all components of the limestone raw materials; calcination in a muffle furnace; and appearance inspection after the calcination. The quality comprehensive analysis method can further comprises the step of crushing test by a pressing machine. From multiple aspects such as appearance, chemical component analysis, calcination simulation, appearance inspection after the calcination, crushing by the pressing machine and the like, various characteristics of the limestone raw materials are comprehensively inspected, and the quality of the limestone raw materials is judged all sidedly. Therefore, a guarantee and a basis are provided for the stable and high-quality production of the sleeve kiln. Besides, accident risks brought by the inferior quality of limestone are remarkably reduced during the production process, so that the safety performance is improved.
Description
Technical field
The invention belongs to quality analysis and the detection technique field of material, especially relate to the quality comprehensive analytical approach of raw material in a kind of sleeve kiln.
Background technology
Sleeve kiln is the one in limekiln, have hear rate low, activity of lime is high, and structure is simple, the feature that fuel tolerance is strong, compared with traditional limekiln, lime is calcined in annular space, air flow method evenly, without cooling device in kiln, failure rate is low, is easy to safeguard, is applicable to the technology such as steel industry utilizes coke-oven gas and calcium carbide, chemical industry utilizes calcium carbide stove exhaust and produces high-quality lime.In sleeve kiln, raw material is lime stone, principal ingredient is calcium carbonate, chemical composition is mainly in the standard of current domestic measurement lime stone quality, but chemical composition can not the general status of complete reaction lime stone, in actual production process, just occurred that lime stone chemical composition detected met standard completely, but cause very large quality accident in actual roasting process, occur larger Decrepitation Phenomena, thus cause the situation that dedusting fan unloading valve blocks completely.Therefore, if lime stone quality inspection standard can be improved, just create better condition for producing, ensureing production efficiency, reducing the accident rate in production run.
Summary of the invention
For solving the problem, the invention discloses the quality comprehensive analytical approach of raw material in a kind of sleeve kiln, by analysis and the screening of multiple step, accurately can analyze the quality condition of raw limestone, when changing the raw limestone that different manufacturers is produced, top quality starting material can be filtered out, for sleeve kiln steady production provides sound assurance.
In order to achieve the above object, the invention provides following technical scheme:
A kind of sleeve kiln raw material limestone quality comprehensive analytical approach, comprises the steps:
(1) apparent mass inspection
Require that granularity is in lime stone >=95% between 40-70mm, lime stone silicon line width≤2mm;
After limestone crushing is 25mm to granularity, selects the lime stone sample after fragmentation to carry out boiling glue, oven dry, corase grind, fine grinding and polishing, make the reflectance specimen of metallographic microscope, require lime stone crystal size≤100 μm;
(2) full constituent analysis is carried out to lime stone
Principal ingredient in lime stone is analyzed, each composition by weight percent need be met: CaO>=53%, MgO≤3%, SiO
2≤ 2.5%, P≤0.01%, S≤0.025%;
(3) calcine in muffle furnace
Get the lime stone sample of 50-60mm particle diameter, sample clean is clean, then 110 DEG C of oven dry;
Dried lime stone is weighed, and weight before recording sample calcining;
Lime stone sample after drying is placed in muffle furnace;
Muffle furnace is warming up to 850 DEG C from normal temperature, and heating rate is 100 DEG C/h, 8 hours used times;
Preset temperature point 850 DEG C, 950 DEG C, 1050 DEG C, 1150 DEG C, each temperature spot is incubated 2 hours, is warming up to another temperature spot from a temperature spot, and heating rate is 100 DEG C/h;
Cooling: be warming up to 1150 DEG C and after being incubated 2 hours, takes out sample and puts into exsiccator and cool, the glass cover of exsiccator is opened 10 minutes, and then covers, stay a little space, cover completely after one hour again, until reach normal temperature from muffle furnace;
Sample is weighed, and weight after recording sample calcining, require front weight≤56% of weight/calcining after the calcining of sample;
Put into by sample in 5mm, 10mm screen cloth and sieve, screen cloth is homeotropic alignment from top to bottom, puts in order according to screen cloth particle diameter order from big to small, weigh screen overflow and the screen underflow of each screen cloth, and record the weight of screen overflow and screen underflow, calculate the lower rate of sieve, require 5mm screen underflow≤10%;
(4) visual examination after calcining
Not stratified after limestone calcination.
As a modification of the present invention scheme, also comprise the steps:
(5) pressing machine crushing test
Lime after calcining is positioned on pressing machine, crushes by 10KN intensity;
Sample is put in 3mm, 5mm, 10mm screen cloth and sieve, screen cloth is homeotropic alignment from top to bottom, put in order according to screen cloth particle diameter order from big to small, weigh screen overflow and the screen underflow of each screen cloth, and record the weight of screen overflow and screen underflow, following condition should be met: screen underflow≤7% of 3 %≤3mm screen clothes, thing≤7% between the sieve of 3%≤3mm screen cloth and 5mm screen cloth, thing≤12% between the sieve of 8 %≤5mm screen clothes and 10mm screen cloth, screen overflow≤85% of 75%≤10mm screen cloth.
Compared with prior art, sleeve kiln material quality analytical approach provided by the invention, after apparent, chemical composition analysis, simulation calcining, calcining, the many-side such as visual examination, pressing machine fragmentation is started with, the various characteristics of integrated survey lime stone, judge the quality of lime stone all sidedly, provide safeguard and foundation for sleeve kiln stably carries out high quality of production, obviously reduce the risk probability due to lime stone low quality generation accident in production run, improve security performance.
Accompanying drawing explanation
Fig. 1 is heating curve when carrying out sample calcining in muffle furnace.
Embodiment
Below with reference to specific embodiment, technical scheme provided by the invention is described in detail, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
Sleeve kiln raw material limestone quality comprehensive analytical approach provided by the invention, comprises the steps:
(1) first need to carry out apparent mass inspection
1.1 granularity.Sleeve kiln to require in lime stone that most granularity will at 40-70mm, is wherein greater than 70mm and is less than 40mm ratio to be less than 5%, and the screening of limestone granularity can adopt vibratory screening apparatus to complete.
1.2 color.Normal lime stone is black, green grass or young crops, yellowish-brown color because of differences such as impure elements, and the apparent lime stone in white bowlder-like can not be used for the production of sleeve kiln;
1.3 silicon lines.If the width of lime stone silicon line is greater than 2mm aborning, then can not enters kiln and use.
1.4 strata behavior.After being crushed to about 25mm, select sample carry out resin boil glue after, dry at 150 DEG C 4 hours, corase grind (corase grind granularity be 200 orders), fine grinding (fine mill size is 500 orders) and polishing (polishing granularity is 1000 orders) operation, make the reflectance specimen of metallographic microscope, the qualified lime stone crystal size that sleeve kiln is suitable for answers≤100 μm.When carrying out the detection of the lime stone that many are supplied and selecting, in order to reflect the true colors of sample as far as possible objectively, often kind of lime stone all makes 2 samples, and sample is observed under 200 power microscopes.
(2) secondly full constituent analysis is carried out to lime stone
In 2.1 qualified lime stones, each component content is as shown in the table
| Project | CaO | MgO | SiO 2 | P | S |
| Unit | % | % | % | % | % |
| Index (percentage by weight) | ≥53 | ≤3.0 | ≤2.5 | ≤0.01 | ≤0.025 |
2.2 full constituent analysis detection methods adopt known chemical analysis method in the industry, and its sampling and constituent analysis flow process are carried out according to the regulation of industry standard, repeat no more in the present invention.
(3) simulation laboratory's calcining in muffle furnace
This step, by carrying out sample calcining in muffle furnace, can simulate calcining working condition in sleeve kiln, obtains lime stone finished product pulverized limestone rate.
Experimental procedure is as follows:
3.1 4 pieces, the lime stones getting 50-60mm particle diameter, and be numbered sample A, sample B, sample C, sample D, sample clean is clean, then 110 DEG C of oven dry;
3.2 pairs of dried lime stones are weighed, and weight m1 before recording each sample calcining;
Lime stone sample after oven dry is placed in muffle furnace by 3.3;
3.4 muffle furnaces are warming up to 850 DEG C from normal temperature, and heating rate is 100 DEG C/h, 8 hours used times;
3.5 preset 850 DEG C-950 DEG C-1050 DEG C-1150 DEG C (totally 4 temperature spots), and each temperature spot is incubated 2 hours, and as shown in Figure 1, be warming up to another temperature spot from a temperature spot, heating rate is 100 DEG C/h;
3.6 coolings: be warming up to 1150 DEG C and after being incubated 2 hours, take out sample and put into exsiccator and cool from muffle furnace; The glass cover of exsiccator is opened 10 minutes, and then covers, stay a little space, prevent the lime stone moisture absorption, cover completely again after one hour, until reach normal temperature; This cooling procedure is comparatively mild, causes loose cracking after avoiding lime stone to cool rapidly.
Then 3.7 weigh sample, and weight m2 after recording each sample calcining.
M2/m1 answers≤56%
Sample is put in 5mm, 10mm screen cloth and carry out sieving that (screen cloth is homeotropic alignment from top to bottom, projection is overlapping, puts in order according to screen cloth particle diameter order from big to small), weigh screen overflow and screen underflow, and record the weight of screen overflow and screen underflow, calculate the lower rate of sieve.If 5mm screen underflow is greater than 10%, then after calcining is described, powdery is many, directly can judge that this lime stone can not be used for the production of sleeve kiln.
(4) also tackle lime stone after calcining and carry out visual examination
Lime after calcining under normal circumstances should in white, surperficial yellowish; And in black, brownish red after improper limestone calcination;
If there is layering after limestone calcination, Particulate Inclusion between layers, then illustrate that lime stone silicon line is wider, can not use in sleeve kiln;
(5) if the lime color after calcining is normal, and in step (3), 5mm screen underflow is less than or equal to 10%, also can carry out pressing machine crushing test, to ensure the quality of lime stone further.
Lime after calcining is positioned on pressing machine by 5.1, crushes by 10KN intensity;
Sample to be put in 3mm, 5mm, 10mm screen cloth and is carried out sieving that (screen cloth is homeotropic alignment from top to bottom by 5.2, projection is overlapping, puts in order according to screen cloth particle diameter order from big to small), weigh screen overflow and screen underflow, and record the weight of screen overflow and screen underflow, calculate the lower rate of sieve.
The normal range of 5.3 screen underflows should be as shown in the table:
| Particle diameter | <3mm | 3mm-5mm | 5mm-10mm | >10mm |
| Percent (%) | 3～7 | 3～7 | 8～12 | 75～85 |
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, also comprises the technical scheme be made up of above technical characteristic combination in any.
Claims (2)
1. a sleeve kiln raw material limestone quality comprehensive analytical approach, is characterized in that, comprise the steps:
(1) apparent mass inspection
Require that granularity is in lime stone >=95% between 40-70mm, lime stone silicon line width≤2mm;
After limestone crushing is 25mm to granularity, selects the lime stone sample after fragmentation to carry out boiling glue, oven dry, corase grind, fine grinding and polishing, make the reflectance specimen of metallographic microscope, require lime stone crystal size≤100 μm;
(2) full constituent analysis is carried out to lime stone
Principal ingredient in lime stone is analyzed, each composition by weight percent need be met: CaO>=53%, MgO≤3%, SiO
2≤ 2.5%, P≤0.01%, S≤0.025%;
(3) calcine in muffle furnace
Get the lime stone sample of 50-60mm particle diameter, sample clean is clean, then 110 DEG C of oven dry;
Dried lime stone is weighed, and weight before recording sample calcining;
Lime stone sample after drying is placed in muffle furnace;
Muffle furnace is warming up to 850 DEG C from normal temperature, and heating rate is 100 DEG C/h, 8 hours used times;
Preset temperature point 850 DEG C, 950 DEG C, 1050 DEG C, 1150 DEG C, each temperature spot is incubated 2 hours, is warming up to another temperature spot from a temperature spot, and heating rate is 100 DEG C/h;
Cooling: be warming up to 1150 DEG C and after being incubated 2 hours, takes out sample and puts into exsiccator and cool, the glass cover of exsiccator is opened 10 minutes, and then covers, stay a little space, cover completely after one hour again, until reach normal temperature from muffle furnace;
Sample is weighed, and weight after recording sample calcining, require front weight≤56% of weight/calcining after the calcining of sample;
Put into by sample in 5mm, 10mm screen cloth and sieve, screen cloth is homeotropic alignment from top to bottom, puts in order according to screen cloth particle diameter order from big to small, weigh screen overflow and the screen underflow of each screen cloth, and record the weight of screen overflow and screen underflow, calculate the lower rate of sieve, require 5mm screen underflow≤10%;
(4) visual examination after calcining
Not stratified after limestone calcination.
2. sleeve kiln raw material limestone quality comprehensive analytical approach according to claim 1, is characterized in that, also comprise the steps:
(5) pressing machine crushing test
Lime after calcining is positioned on pressing machine, crushes by 10KN intensity;
Lime sample through crushing is put in 3mm, 5mm, 10mm screen cloth and sieves, screen cloth is homeotropic alignment from top to bottom, put in order according to screen cloth particle diameter order from big to small, weigh screen overflow and the screen underflow of each screen cloth, and record the weight of screen overflow and screen underflow, following condition should be met: screen underflow≤7% of 3 %≤3mm screen clothes, thing≤7% between the sieve of 3%≤3mm screen cloth and 5mm screen cloth, thing≤12% between the sieve of 8 %≤5mm screen clothes and 10mm screen cloth, screen overflow≤85% of 75%≤10mm screen cloth.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102200502A (en) * | 2010-03-25 | 2011-09-28 | 宝山钢铁股份有限公司 | Method for authenticating dolomite for metallurgy in rotary kiln |
| CN102411047A (en) * | 2010-09-21 | 2012-04-11 | 宝山钢铁股份有限公司 | Method for identifying limestone for suspension kiln |
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| JP3657678B2 (en) * | 1995-11-29 | 2005-06-08 | 太平洋セメント株式会社 | Simplified determination of limestone and dolomite |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102200502A (en) * | 2010-03-25 | 2011-09-28 | 宝山钢铁股份有限公司 | Method for authenticating dolomite for metallurgy in rotary kiln |
| CN102411047A (en) * | 2010-09-21 | 2012-04-11 | 宝山钢铁股份有限公司 | Method for identifying limestone for suspension kiln |
Non-Patent Citations (1)
| Title |
|---|
| 石灰石性能综合实验研究;苏白兰 等;《河南冶金》;20000831(第4期);第12-14,22页 * |
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