CN102826770B - Method for roasting ultralow-carbon lime in rotary kiln and lime product produced by same - Google Patents
Method for roasting ultralow-carbon lime in rotary kiln and lime product produced by same Download PDFInfo
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Abstract
The invention relates to a method for roasting ultralow-carbon lime in a rotary kiln and a lime product produced by the same. The method comprises the following steps: sufficiently roasting limestone at the high temperature of 1010-1050 DEG C for 1.5-2.5 hours under the conditions of coal quantity 6800-7200 Kg/hour and fuel charge 6-10 L/hour, cooling, crushing, screening, and adding a surface modifier for passivation, thereby obtaining the lime product. The low-carbon lime has the advantages of favorable moisture resistance, long storage period, low production cost, high purity and high activity, and satisfies the RH furnace refinement decarburization/denitrification technique of high-designation silicon steel, pipeline steel and ultralow-carbon steel.
Description
Technical field
The present invention relates to a kind of method of rotary kiln baking lime and the lime product of production thereof.
Background technology
At present, the production technique of domestic scale operation quickened lime, mainly contains shaft furnace, rotary kiln, mechanical kiln, and fuel mainly adopts coal dust, coal gas, Sweet natural gas.Quickened lime carbon content >=0.5% that traditional technology is produced, cannot meet high grade silicon steel, pipe line steel, ultra low-carbon steel and RH carbon drop desulfurization lime powder used etc. to the carbon content of quickened lime lower than 0.2%, the specification of quality of S≤0.025%, CaO >=90%.
Therefore, be badly in need of the method that exploitation makes new advances, prepare the above-mentioned lime that carbon content requires that meets.
Summary of the invention
The present invention for can production carbon content lower than 0.2% lime, employing is with vertical preheating, process for cooling large-sized rotary kiln (1000 ton per day) roasting, take coal dust as main fuel, be accompanied by high-calorie fats fuel, by adjusting rotary kiln technology parameter, as drum speed, injecting coal quantity, guarantee that Wingdale is at thorough roasting, keep on high reactivity degree (activity degree represents the ability that Wingdale reacts with water) basis, produce the Ultra-low carbon lime of carbon content≤0.2%, through fragmentation, after screening, add a kind of surface-modifying agent passivation, produce good anti-moisture ability, long quality-guarantee period, production cost is low, high purity and highly active Ultra-low carbon quickened lime, can meet the specification of quality of special kinds steel to quickened lime.
Roasting rate means the index of lime burning degree.Roasting rate >=99% of low carbon lime processing requirement Wingdale, guarantee residual carbon content≤0.2%, the calcining process that science is suitable is the key of guaranteeing that project success is implemented.The calcined by rotary kiln Wingdale that this patent adopts is adjusted calcining temperature and calcining manners under the processing condition of original production quickened lime, the mode that fuel adopts coal dust and oil spout to mix.
Low carbon lime processing requirement CaO >=90%, the Wingdale raw ore that the even impurity of How to choose grade is few plays conclusive effect to finished product.It is 20-40mm that this patent is used particle diameter, and general granularity is super limits the quantity of and do not surpass 3% up and down, and sulphur content is not more than 0.02%, CaO and is not less than 52%.
Passivator is processed will guarantee sulphur content S≤0.025% in lime, lime itself is exactly a kind of effective sweetening agent, and crystal lime intergranular has space, easily absorption, easy deliquescence, guarantee S≤0.025%, and the long period stores, the processing of passivator plays a decisive role to the finished product, this patent sprays the passivator of 1%-15% after being broken into the lime of qualified particle diameter, can make Ultra-low carbon lime extend the shelf life, and generally the quality guaranteed period of this product can reach 3 months.
The invention provides a kind of method of rotary kiln baking lime, it is characterized in that, at injecting coal quantity 6800-7200Kg/ hour, fuel charge 6-10L/ hour, under the condition of calcining temperature 1010-1050 ℃, make the abundant high-temperature roasting 1.5-2.5 hour of Wingdale, through cooling, broken, screening after add surface-modifying agent passivation, obtain lime product;
Preferably, described injecting coal quantity is 6900-7100Kg/ hour, fuel charge 7-9L/ hour, calcining temperature 1020-1040 ℃;
Most preferably, described injecting coal quantity is 7000Kg/ hour, fuel charge 8L/ hour, and 1030 ℃ of calcining temperatures, roasting time is 2h.
Preferably, the secondary air flow 53000-55000Nm of described high-temperature roasting step
3/ h.
Preferably, the drum speed of the rotary kiln of described high-temperature roasting step is 0.73 ~ 0.8r/min.
Preferably, the temperature of kiln head 650-920 ℃ of the rotary kiln of described high-temperature roasting step, preferably, temperature of kiln head 700-800 ℃, most preferably, 750 ℃ of temperature of kiln head.
Preferably, the granularity of described calcining raw materials Wingdale is 20～40mm, and sulphur content is not more than 0.02%, CaO and is not less than 52%.
Preferably, the surface-modifying agent of described passivation step is halogenide, preferably calcium chloride.
Preferably, the add-on of the surface-modifying agent of described passivation step is 1～15%.
Preferably, described screening step is used double deck screen, and mesh size is upper strata 12mm, the 2～5mm of lower floor.
Preferably, roasting rate >=99% of the Wingdale of described high-temperature calcination step.
The present invention also provides a kind of lime product, by aforesaid method, is obtained, and it is characterized in that, described lime carbon content≤0.2%; Sulphur content≤0.025%.
Preferably, the calcium oxide content 90～98% of described lime product.
Preferably, the activity degree 390～440mL of described lime product.
Preferably, the granularity of described lime product is 2～12mm.
This patent has improved traditional rotary kiln manufacturing condition, high-temperature calcination Wingdale.After having calcined, be broken into the lime of release mesh, then spray passivator, obtain that good anti-moisture ability, long quality-guarantee period, production cost are low, high purity and highly active low carbon lime.Lime carbon content≤0.2% of producing by this method, calcium contents can reach 90% ~ 98%, and activity degree is 390 ~ 440mL, meets and smelts high grade silicon steel, pipe line steel, ultra low-carbon steel RH stove refining decarburization, denitrification process.
Accompanying drawing explanation
Fig. 1 is the schema of the main production of lime of the present invention.
Embodiment
With following example, describe in detail as follows, yet, one skilled in the art will appreciate that protection scope of the present invention should not be confined to this.
Raw material:
Coal dust: weakly caking coal coal dust, because its low-sulfur, low ash content are used.
High-calorie fats fuel: general selection all can higher than the diesel oil of 40#.
Wingdale: the granularity of preferably using Wingdale is 20～40mm, granularity is super limits the quantity of and does not surpass 3% up and down, and sulphur content is not more than 0.02%, CaO and is not less than 52%.
In conjunction with schema Fig. 1, the method for rotary kiln baking Ultra-low carbon lime of the present invention, comprises the following steps:
(1) high-temperature calcination
With vertical preheating, (vertical pre-heating technique is a kind of advanced person's sinter process, and roasting raw material can reach 30% rate of decomposition in warm, is convenient to waste gas recycling in kiln, plays energy-conserving action in employing.) process for cooling large-sized rotary kiln (1000 ton per day) roasting, take coal dust as main fuel, be accompanied by high-calorie fats fuel.
High-temperature calcination step of the present invention is by adjusting rotary kiln technology parameter, guarantee that Wingdale is at thorough roasting, specifically, adjusting and making injecting coal quantity injecting coal quantity is 6800-7200Kg/ hour, fuel charge is 6-10L/ hour, calcining temperature 1010-1050 ℃, under this condition, makes the abundant high-temperature roasting 1.5-2.5 hour of Wingdale, preferably, described injecting coal quantity is 6900-7100Kg/ hour, fuel charge 7-9L/ hour, calcining temperature 1020-1040 ℃; Most preferably, described injecting coal quantity is 7000Kg/ hour, fuel charge 8L/ hour, and 1030 ℃ of calcining temperatures, roasting time is 2h.
Introducing air, as secondary air, enters the lime after the cooling calcining of refrigerating unit, imports rotary calciner again carry out combustion-supporting by lime after being heated.The secondary air flow 53000-55000Nm of described high-temperature roasting step
3/ h, 0.73 ~ 0.8r/min drum speed;
The temperature of kiln head 650-920 ℃ of described rotary kiln.Preferably, temperature of kiln head 700-800 ℃; Most preferably, temperature of kiln head is 750 ℃.
(2) cooling
By the lime after calcining in rotary kiln, in water cooler, utilize secondary air force to be cooled to≤150 ℃.
(3) fragmentation
By cooled Wingdale, utilize hammer mill, fragmentation obtains the lime of 0-15mm granularity.For example use the crusher of PC300 * 400mm.
(4) screening
The lime that fragmentation is obtained, sub-elects by method for sieving the lime that particle diameter is 2-12mm.Preferably use upper strata, aperture 12mm, the 2-5mm of lower floor, preferably the double-deck screen shale shaker of 5mm carries out.The low carbon lime of this granularity should meet the processing requirement of lower operation steel-making.
(5) passivation
By the lime of screening gained, in screening process, add passivator, passivator is selected halogenide, preferably calcium chloride, the weight ratio adding can be 1～15%, and makes Ultra-low carbon lime carbon content≤0.2%, calcium contents >=90%, sulphur weight percent content≤0.025%, roasting rate >=99% of described Wingdale.Described lime carbon content≤0.2%; Calcium oxide content 90～98%; Activity degree 390～440mL.Sulphur content≤0.025% of described lime product.
Product, after packing, can enter finished bin and store.This product is in strict conformity with smelting the high trade mark, pipe line steel, and the requirement of ultra low-carbon steel and RH carbon drop desulfurization lime powder used has even exceeded its requirement.
Following examples equipment, raw material used is this area routine, commercially available obtaining.Embodiment (preparation test and performance evaluation experiment):
Embodiment 1
Before experiment, prepare 20-40mm Wingdale, granularity is super limits the quantity of and does not surpass 3% up and down, raw material S content 0.02wt%, CaO content 52wt%.
Calcined by rotary kiln significant parameter is controlled according to following standard: 0.73 rev/min of rotating speed, 1010 ℃ of calcining temperatures, 650 ℃ of temperature of kiln head, secondary air flow 53000Nm
3/ hour, 6800 kgs/hour of injecting coal quantities, fuel charge 6L/min.
Calcine after 1.5 hours, through being cooled to 100 ℃, utilize PC300 * 400mm hammer crushing crusher machine to obtain the lime of 0-15mm granularity, by upper strata, aperture 12mm, the linear vibrating screen of the 5mm of lower floor, sieves, and obtains the lime that particle diameter is 2-12mm, add calcium chloride to carry out passivation, obtain lime product.
Embodiment 2
Before experiment, prepare 20-40mm Wingdale, granularity is super limits the quantity of and does not surpass 3% up and down, raw material S content 0.02wt%, CaO content 52wt%.
Calcined by rotary kiln significant parameter is controlled according to following standard: 0.8 rev/min of rotating speed, 1050 ℃ of calcining temperatures, 920 ℃ of temperature of kiln head, secondary air flow 55000Nm
3/ hour, 7200 kgs/hour of injecting coal quantities, fuel charge 10L/min.
Calcine after 2.5 hours, through being cooled to 150 ℃, utilize PC300 * 400mm hammer crushing crusher machine to obtain the lime of 0-15mm granularity, by upper strata, aperture 12mm, the linear vibrating screen of the 5mm of lower floor, sieves, and obtains the lime that particle diameter is 2-12mm, add calcium chloride to carry out passivation, obtain lime product.
Embodiment 3
Before experiment, prepare 20-40mm Wingdale, granularity is super limits the quantity of and does not surpass 3% up and down, raw material S content 0.02wt%, CaO content 52wt%.
Calcined by rotary kiln significant parameter is controlled according to following standard: 0.76 rev/min of rotating speed, 1030 ℃ of calcining temperatures, 785 ℃ of temperature of kiln head, secondary air flow 54000Nm3/ hour, 7000 kgs/hour of coal amounts, fuel charge 8L/min.
Calcine after 2 hours, through being cooled to 120 ℃, utilize PC300 * 400mm hammer crushing crusher machine to obtain the lime of 0-15mm granularity, by upper strata, aperture 12mm, the linear vibrating screen of the 5mm of lower floor, sieves, and obtains the lime that particle diameter is 2-12mm, add calcium chloride to carry out passivation, obtain lime product.
Embodiment 4
Before experiment, prepare 20-40mm Wingdale, granularity is super limits the quantity of and does not surpass 3% up and down, raw material S content 0.02wt%, CaO content 52wt%.
Calcined by rotary kiln significant parameter is controlled according to following standard: 0.76 rev/min of rotating speed, 1020 ℃ of calcining temperatures, 700 ℃ of temperature of kiln head, secondary air flow 54000Nm
3/ hour, 6900 kgs/hour of injecting coal quantities, fuel charge 7L/min.
Calcine after 2 hours, through being cooled to 120 ℃, utilize PC300 * 400mm hammer crushing crusher machine to obtain the lime of 0-15mm granularity, by upper strata, aperture 12mm, the linear vibrating screen of the 5mm of lower floor, sieves, and obtains the lime that particle diameter is 2-12mm, add calcium chloride to carry out passivation, obtain lime product.
Embodiment 5
Before experiment, prepare 20-40mm Wingdale, granularity is super limits the quantity of and does not surpass 3% up and down, raw material S content 0.02wt%, CaO content 52wt%.
Calcined by rotary kiln significant parameter is controlled according to following standard: 0.76 rev/min of rotating speed, 1040 ℃ of calcining temperatures, 800 ℃ of temperature of kiln head, secondary air flow 54000Nm
3/ hour, 7100 kgs/hour of injecting coal quantities, fuel charge 9L/min.
Calcine after 2 hours, through being cooled to 100 ℃, utilize PC300 * 400mm hammer crushing crusher machine to obtain the lime of 0-15mm granularity, by upper strata, aperture 12mm, the linear vibrating screen of the 5mm of lower floor, sieves, and obtains the lime that particle diameter is 2-12mm, add calcium chloride to carry out passivation, obtain lime product.
Reference examples
Raw coal grinds through vertical grinder, after being dried, by coal exhaust blower, delivers to burner, enters the burning of kiln body.The drying source of vertical grinder is taken from kiln hood part secondary air, sends in grinding machine after mixing cold wind.The CaO content of raw material limestone is not less than 52wt%, and S content is lower than 0.030wt%.The Wingdale of granularity between 10-40mm delivered to preheater top feed bin preheating machine feed bin, and kiln tail hot gas is preheating to 900 ℃ of left and right, and Wingdale enters in rotary kiln and calcines.Coal amount is set as 2000 kgs/hour, secondary air flow 8000Nm
3/ h, 1050 ℃ of kiln end temperatures, 600 ℃ of temperature of kiln head.Lime after calcining utilizes secondary air to be cooled to normal temperature, obtains lime finished product.
Measuring method:
Calcium oxide content: the method according to GB/T 3286 < < Wingdales, rhombspar chemical analysis method > > is measured.
Particle diameter: utilize the method in GB/T 2007 < < mineral products sampling in bulk, sample preparation general rule > > to measure.
Carbon content: utilize U.S.'s power to measure by CS simultaneous determination instrument.
Sulphur content: utilize U.S.'s power to measure by CS simultaneous determination instrument.
Roasting rate:
Accurately take the about 5kg of sample, pour in the porose keg in bottom surface, add suitable quantity of water, it is digested 90 minutes naturally.During digestion, prevent that lime kibe from hurting sb.'s feelings.Postdigestive sample is poured the sieve of 5mm into.Screen overflow is poured on steel plate or worktable, and raw burn piece is the limestone block of cyan, and burning piece is black coherent mass, sorts out raw burn piece and burning piece, weighs respectively, obtains raw burn piece quality G1, and burning piece quality G2 calculates roasting rate result by formula below.
Raw burn rate (%)=G
1÷ G * 100
Burning rate (%)=G
2÷ G * 100
Roasting rate (%)=100-raw burn rate-burning rate
In formula
Sample weight before G-digestion
The weight of G1-raw burn piece
The weight of G2-burning piece
Activity degree (fast test method):
Measure and be ready in advance the water 2000ml of 40 ℃ ± 1 ℃ and pour in the beaker of 3000ml, add 5～6 phenolphthalein indicators.In drop-burette, install (4N) hydrochloric acid, then start stirrer, the lime sample that takes 50 grams of 1-5mm is poured in beaker, when solution takes on a red color, uses immediately hydrochloric acid (4N) Continuous Titration, and starts timing, until red, disappears.The ml number of the hydrochloric acid that consumes while recording 5 minutes, the coefficient that this consumption is multiplied by demarcated good 4N hydrochloric acid is activity degree.
Measurement result:
Embodiment sees the following form shown in 1 compared with the prior art.Mensuration or the method for calculation of each comparative parameter are briefly described below:
Interpretation of result:
By relatively drawing above, in various embodiments of the present invention, lime indices is all better than reference examples, and especially carbon content is low to moderate below 0.16%, and reference examples is 0.9%; Quality guaranteed period is 90 days, and reference examples only has 2 days; More than activity degree all reaches 400ml, and reference examples is only 360ml; Roasting rate reaches more than 99%, and reference examples only has 88% etc.And, meet the requirement to quickened lime such as high grade silicon steel, pipe line steel, ultra low-carbon steel and RH carbon drop desulfurization lime powder used, carbon content≤0.2%, calcium contents >=90%, sulphur weight percent content≤0.025%.And wherein, preferred method is embodiment 4 and embodiment 5, it adopts respectively injecting coal quantity is 6900Kg/ hour and 7100Kg/ hour, fuel charge 7L/ hour and 9L/ hour, 1020 ℃ and 1040 ℃ of calcining temperatures, the product carbon content 0.15% and 0.12% that it obtains, calcium oxide content 94.01% and 95.85%, activity degree 411ml and 420ml, roasting rate reaches 99.95% and 99.98%, production cost 1089.40 and 1153.15 yuan/ton, totally more satisfactory.Most preferred method is embodiment 3, its carbon content 0.14%, and calcium oxide content 94.42%, activity degree 419ml, roasting rate reaches 99.98%, quality guaranteed period 90mm, 1099.05 yuan/ton of production costs, general effect is best.
The lime quality evaluation that method of the present invention is produced:
359 tons of method production Ultra-low carbon quickened limes in ore deposit, Dongshan employing embodiment 3, for more than 289 tons of steel-making RH refinings, its physical and chemical index meets refining specification of quality (inner confidential state) completely.
Ultra-low carbon lime carbon content≤0.2% of producing by this method, calcium contents can reach 90% ~ 98%, and activity degree is 390 ~ 440mL, meets and smelts high grade silicon steel, pipe line steel, ultra low-carbon steel RH stove refining decarburization, denitrification process.
Claims (17)
1. the method for a rotary kiln baking lime, it is characterized in that, the granularity of take is calcining raw materials as 20～40mm, sulphur content are not more than the Wingdale that 0.02wt%, CaO be not less than 52wt%, at injecting coal quantity 6800-7200Kg/ hour, fuel charge 6-10L/ hour, under the condition of calcining temperature 1010-1050 ℃, makes the abundant high-temperature roasting 1.5-2.5 hour of Wingdale, through cooling, broken, screening after add surface-modifying agent passivation, obtain lime product.
2. the method for claim 1, is characterized in that, described injecting coal quantity is 6900-7100Kg/ hour, and described fuel charge is 7-9L/ hour, and described calcining temperature is 1020-1040 ℃.
3. the method for claim 1, is characterized in that, described injecting coal quantity is 7000Kg/ hour, and described fuel charge is 8L/ hour, and described calcining temperature is 1030 ℃, and described roasting time is 2h.
4. the method for claim 1, is characterized in that, the secondary air flow 53000-55000Nm of described high-temperature roasting step
3/ h.
5. the method for claim 1, is characterized in that, the drum speed of the rotary kiln of described high-temperature roasting step is 0.73～0.8r/min.
6. the method for claim 1, is characterized in that, the temperature of kiln head 650-920 ℃ of the rotary kiln of described high-temperature roasting step.
7. method as claimed in claim 6, is characterized in that, the temperature of kiln head 700-800 ℃ of the rotary kiln of described high-temperature roasting step.
8. method as claimed in claim 7, is characterized in that, 750 ℃ of the temperature of kiln head of the rotary kiln of described high-temperature roasting step.
9. the method for claim 1, is characterized in that, the surface-modifying agent of described passivation step is halogenide.
10. method as claimed in claim 9, is characterized in that, the surface-modifying agent of described passivation step is calcium chloride.
11. the method for claim 1, is characterized in that, the add-on of the surface-modifying agent of described passivation step is 1～15wt%.
12. the method for claim 1, is characterized in that, described screening step is used double deck screen, and mesh size is upper strata 12mm, the 2～5mm of lower floor.
13. the method for claim 1, is characterized in that, roasting rate >=99% of the Wingdale of described high-temperature calcination step.
The lime product that the method for 14. rotary kiln baking lime as described in claim 1～13 any one obtains, is characterized in that the carbon content≤0.2wt% of described lime product; Sulphur content≤0.025wt%.
15. lime product as claimed in claim 14, is characterized in that, the calcium oxide content 90～98wt% of described lime product.
16. lime product as claimed in claim 14, is characterized in that, the activity degree 390～440mL of described lime product.
17. lime product as claimed in claim 14, is characterized in that, the size range of described lime product is 2～12mm.
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| CN105198239A (en) * | 2015-09-30 | 2015-12-30 | 长兴富强钙业有限公司 | Calcium hydroxide production technology |
| CN106350632B (en) * | 2016-10-31 | 2019-05-24 | 湛江盛宝科技有限公司 | Pneumatic steelmaking light-burned pressure ball and preparation method thereof |
| CN106587667B (en) * | 2016-12-28 | 2019-05-03 | 柳州市昌泉贸易有限公司 | A kind of method of calcined limestone production active lime powder |
| CN108439828A (en) * | 2018-01-31 | 2018-08-24 | 广西华洋矿源材料有限公司 | A kind of production method of low-carbon active lime |
| CN112960916A (en) * | 2020-11-28 | 2021-06-15 | 张顺元 | Self-circulation system of active lime rotary kiln |
| CN115490440B (en) * | 2021-06-17 | 2023-05-05 | 太原钢铁(集团)有限公司 | Operation method for calcining limestone with large particle size ratio |
| CN113281212B (en) * | 2021-06-28 | 2022-10-14 | 江苏鹏飞集团股份有限公司 | Raw and overfire rate measuring and calculating method |
| CN113336457B (en) * | 2021-07-10 | 2023-02-10 | 阳泉恒跃兴钙业有限公司 | Self-feedback calcination control method and device for lime burning in rotary kiln |
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| US4259081A (en) * | 1977-04-30 | 1981-03-31 | Metallgesellschaft Aktiengesellschaft | Process of calcining limestone in a rotary kiln |
| US4391671A (en) * | 1981-05-27 | 1983-07-05 | Pulp And Paper Research Institute Of Canada | Method of producing lime in a rotary kiln |
| CN1621351A (en) * | 2003-11-30 | 2005-06-01 | 刘景三 | Method for producing high activity calcium oxide |
| 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 |
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|---|---|---|---|---|
| US4259081A (en) * | 1977-04-30 | 1981-03-31 | Metallgesellschaft Aktiengesellschaft | Process of calcining limestone in a rotary kiln |
| US4391671A (en) * | 1981-05-27 | 1983-07-05 | Pulp And Paper Research Institute Of Canada | Method of producing lime in a rotary kiln |
| CN1621351A (en) * | 2003-11-30 | 2005-06-01 | 刘景三 | Method for producing high activity calcium oxide |
| 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 |
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