CN101891378A - Equipment and method for producing slag wool by utilizing ironmaking slag - Google Patents
Equipment and method for producing slag wool by utilizing ironmaking slag Download PDFInfo
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- CN101891378A CN101891378A CN 201010211387 CN201010211387A CN101891378A CN 101891378 A CN101891378 A CN 101891378A CN 201010211387 CN201010211387 CN 201010211387 CN 201010211387 A CN201010211387 A CN 201010211387A CN 101891378 A CN101891378 A CN 101891378A
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Abstract
The invention provides equipment and method for producing slag wool by utilizing ironmaking slag, belonging to the technical field of ironmaking slag utilization. The equipment comprises a slag tank, a blowing oxygen warming tank, an injection tank, a wool blowing chamber, a heat exchanger, a bag collector, a main exhaust fan and a chimney which are connected end to end in sequence, and a fascicular nozzle, wherein the fascicular nozzle is positioned below the injection tank and provides the air source for injecting the high-temperature slag; the exit of the injection tank is arranged on the upper part of one end of the wool blowing chamber; and the part of 30-100mm on the lower part of the exit of the injection tank is shaped like pendent flat nose. The process comprises the steps of ironmaking slag regulating, slag wool blowing, waste heat recycling and slag wool collecting. The invention has the following advantages: the invention can reasonably utilize the blast-furnace slag, produce the slag wool with high value-added, can effectively recycle the waste heat of the blast-furnace slag and is energy saving, environment-friendly and obvious in economic benefits.
Description
Technical field
The invention belongs to blast furnace slag and utilize technical field, a kind of equipment and method of utilizing blast furnace slag operating mine slag wool is provided, for utilizing metallurgy industry iron-smelting blast furnace slag to produce the high value added product slag wool and rationally utilizing the blast furnace slag waste heat to open up new way, energy-conserving and environment-protective have been realized.
Background technology
Metallurgy industry iron-smelting blast furnace slag treatment process is divided into dried slag and Water Quenching Slag, because it is comparatively serious to go out dried slag environmental pollution, and resource utilization is low, now seldom uses, and is general only when accident treatment, dried pit or slag is set irritates and slag tap; Blast furnace slag is handled the main Water Quenching Slag technology that adopts at present.Obtain grain slag after the shrend, grain slag can be used for making slag brick, lightweight concrete building block or is dried the grinding back as cement raw material, though this method has been carried out reasonable utilization with waste residue, added value of product is lower, and the waste heat of slag does not obtain reasonable use.
Summary of the invention
The object of the present invention is to provide a kind of equipment and method of utilizing blast furnace slag operating mine slag wool, blast-furnace slag rationally can be utilized, produce the slag wool of high added value, but and efficient recovery blast-furnace slag waste heat, energy-saving and environmental protection, remarkable in economical benefits.
Equipment of the present invention comprise slag chute, oxygen blast heat groove, the winding-up groove, pencil nozzle, blow cotton chamber, heat exchanger, cloth bag collector, main exhauster and chimney.Its mode of connection is: slag chute, oxygen blast heat groove, the groove of jetting, blow cotton chamber, heat exchanger, cloth bag collector, main exhauster and chimney successively head and the tail is connected, the pencil nozzle is positioned at winding-up groove below, the high temperature molten slag provides source of the gas in order to jet.The concrete connection of equipment seen Fig. 2.The outlet of winding-up groove is the sagging shape of twitching one's mouth for bottom 30-100 centimetre, and the sagging angle of twitching one's mouth becomes the 5-45 degree with level, twitch one's mouth mouthful width 5-50 centimetre, twitches one's mouth mouthful thickness 3-7 centimetre, can reach maximum per hour 80 tons flow; The oxygen blast groove of heating is a rectangular parallelepiped, and the oxygen blast warming portion is at the middle part, and there are one, two or three outlets in the back; Blow the spheroid that is shaped as of cotton chamber, the bottom is established conical discharge mouth 3-5.
Winding-up groove and pencil nozzle are described:. high-temperature slag exports effusive shape and flow from the winding-up groove blowing of slag wool is had material impact.We have selected the outlet of winding-up groove to be the sagging shape of twitching one's mouth, as shown in Figure 1.The sagging angle of twitching one's mouth becomes the 5-45 degree with level, best angle be the 15-30 degree (choosing of the sagging angle of twitching one's mouth can guarantee that flowing out the high temperature molten slag is shaped as flat stream, promptly thickness is at 2-5 centimetre, and when the outlet of winding-up groove is flowed out whereabouts flow velocity 0.2-1.5 meter per second.Should adjust pencil nozzle supply gas pressure increases if exit velocity is too high.Under the supply gas pressure of normal 0.6-1.0MPA, it is best for 3-4 centimetre that the pencil nozzle flows out high temperature molten slag flat stream thickness; Falling velocity 0.3-0.5 meter per second the best during outflow).Twitch one's mouth mouthful width 5-50 centimetre and (per hour can adapt to the slag wool production under the 5-80 ton flow status, twitch one's mouth and the supporting use of pencil nozzle.), twitch one's mouth mouthful thickness 3-7 centimetre (4-5 centimetre for best).So just guaranteed the shape of high-temperature slag when the winding-up concentrated flow goes out, be beneficial to and blow out high-quality slag wool.Owing to twitching one's mouth mouthful broad and downward-sloping, the flow velocity of high-temperature slag is very fast simultaneously, can reach maximum per hour 80 tons flow.
The pencil nozzle is most important to the spray quality of slag wool.40～100 regular arranging of gas orifice are arranged on the pencil nozzle among the present invention, adjacent pore hole is in the heart apart from the 15-40 millimeter, wherein a part of gas orifice level is in line, gas orifice is vertically lined up two row in addition, lay respectively at the both sides of a horizontal venting hole, form a U font with a horizontal venting hole.The horizontal spreads of pore and the winding-up groove mouthful width corresponding (slightly be wider than the winding-up groove and twitch one's mouth mouthful width 4-6 centimetre) of twitching one's mouth, vertically height 15-50 centimetre of the pore arrangement.The diameter of each Spray pore is 5-10 millimeter (the 6-8 millimeter is for best), and the hole heart distance of adjacent two gas orifices is 15-40 millimeter (25-30 millimeter the best).The pencil jet size should mate with the mouth of twitching one's mouth of winding-up groove outlet, adapts to the winding-up concentrated flow and goes out the width and the thickness of high-temperature slag materials flow.
Technical process of the present invention is:
1, the modulation of blast furnace slag: effusive slag iron is the high temperature fluid of 1450-1550 degree through the isolated blast furnace slag of fecal iron separator from the blast furnace casting stokehold, basicity is at 1.05-1.15, add basicity and adjust agent (ground silica, basalt powder, andesite powder or lime) its basicity is adjusted between the 1.0-1.10, it is evenly unrestrained to the slag surface from the slag chute afterbody that basicity is adjusted agent, after adding basicity adjustment agent, the oxygen blast that slag the flows into drop 0.2-1.0 rice groove of heating, the oxygen blast coal pipe of heating in the groove is blown into oxygen blast after mixed and heats in the groove in the slag stream with oxygen lance, the oxygen blast back slag of heating flows temperature 1450-1500 degree scope;
2, the blowing of slag wool: with high pressure nitrogen or pressurized air, pressure is 0.6-1.0Mpa, and the winding-up high-temperature slag is produced slag wool; Process is: enter the winding-up groove by the oxygen blast effusive deployed high-temperature slag of groove of heating, flow out from notch after the materials flow shaping, be blowed materials flow and flow out, fall from the outlet of winding-up groove, the winding-up flow is every cubic metre of slag 2000-3500 cubic meter nitrogen or air; The slag wool fiber diameter 6-8 micron that blows out; Blowing cotton indoor slag wool concentration is 400-700 gram/cubic meter, and blowing cotton chamber pressure is-0.3--1.5Kpa to blow cotton chambers temp 700-1200 degree centigrade;
3, waste heat recovery: the high temperature mineral wool that blows the generation of cotton chamber and the heat of air mixture are absorbed, produce high-temperature steam from heat exchanger; Waste heat is effectively absorbed, after heat exchange is finished, 200-300 degree centigrade of exchanger outlet temperature.
4, the collection of slag wool: gas after waste heat recovery and slag wool mixture, by the cloth bag collector slag wool is caught collection;
5, waste residue recycle: blow cotton indoor happy and harmonious raw material is blown when obtaining the cotton mixture of High Temperature Gas, have the part slag and be not blown to cotton-shapedly, fall into and blow bottom, cotton chamber, assemble at residue mouth place, regularly take out residue, add recycle in the slag chute with the addition material form.
Description of drawings
Fig. 1 is the shape figure of winding-up groove slag notch in the blast furnace slag blowing slag wool technology
Fig. 2 is blast furnace slag blowing slag wool process flow sheet.Wherein 1 is slag chute, and 2 are the oxygen blast groove of heating, and 3 are the winding-up groove, and 4 is the pencil nozzle, and 5 for blowing cotton chamber.6 is heat exchanger, and 7 is the cloth bag collector, and 8 is main exhauster, and 9 is chimney, and 10 is the residue mouth.
Fig. 3 is a pencil nozzle pore layout viewing.
Embodiment
Fig. 2 is seen in technical process of the present invention.
1, the modulation of blast furnace slag: effusive slag iron is the high temperature fluid of 1450-1550 degree through the isolated blast furnace slag of fecal iron separator from the blast furnace casting stokehold, the flowability of general blast-furnace slag better, basicity is in 1.05-1.15 (2 yuan of basicity), this basicity scope is not the best basicity of operating mine slag wool, should add ground silica, basalt powder or andesite powder its basicity is adjusted to (optimum alkalinity 1.03-1.06) between the 1.0-1.10.As basicity of slag lower (less than 1.0), should add lime and guarantee that basicity is at 1.0-1.10.The generalized case blast-furnace burden is under constant material situation, basicity of slag is the comparison fixed, therefore, and when blast-furnace burden is identical, basicity of slag basic fixed, the basicity that adds in the equal volume slag are adjusted agent, and (ground silica, basalt powder or andesite powder all are the adjustment agent that reduce basicity.It is the powder that is broken into by silica, basalt and andesite.Silica is the general name of vein quartz, quartzite, quartz sand.The content of its major ingredient silicon-dioxide is respectively 99%, 98%, 95%.The content 45-55% of basalt silicon-dioxide.The content of andesite silicon-dioxide is lower.Can select for use a kind of according to practical situation.Lime is the adjustment agent that increases basicity, and the major ingredient calcium oxide content is at 80-92%.) kind is that identical addition is a fixed, only needs carry out the basicity of slag chemical examination when each blast furnace changes as charge composition, adds the kind of basicity adjustment agent and what with decision.Slag begins to carry out the basicity adjustment in slag chute, it is evenly unrestrained to the slag surface from the slag chute afterbody that basicity is adjusted agent, add after basicity adjusts agent, the oxygen blast that slag flows into drop 0.2-1.0 rice (the 0.4-0.6 rice the best) groove of heating, drop can guarantee that basicity adjusts agent and slag thorough mixing.The oxygen blast coal pipe of heating in the groove is blown into oxygen blast after mixed and heats in the groove in the slag stream with oxygen lance, can guarantee the oxygen blast back slag stream temperature 1450-1500 degree scope of heating, (with the method interpolation coal dust amount of oxygen top blown how much with reach temperature requirement and be as the criterion.It is different that different tapping temperatures and slag flow oxygen requirement and coal dust amount have, and final purpose is to make the slag temperature that flows to the outlet of the winding-up groove the best winding-up temperature at the 1400-1500 degree.) the oxygen blast groove of heating is a rectangular parallelepiped, the oxygen blast warming portion is at the middle part, there are one, two or three outlets in the back, and (outlet is blown cotton chamber slag stream is provided for one, and each blows cotton chamber slag stream and is 80 tons/hour to the maximum, so will determine export volume according to the tap cinder amount.Several exits is just joined a few cover slag wool preparation systems.), (high-temperature slag is that basicity is adjusted to 1.0-1.10 to high-temperature slag, and optimum alkalinity is: 1.03-1.06.The blast furnace slag that temperature is adjusted to the cotton 1400-1500 degree of suitable spray is also named and blows cotton slag.) flow out from heat groove outlet of oxygen blast, oxygen blast is heated if high-temperature slag is flowed through, and temperature still is higher than 1400 degree behind groove and the winding-up groove, then need not heat.High-temperature slag flows into and blows cotton groove through the materials flow shaping, goes out from blowing cotton concentrated flow.(the whereabouts stream shape that meets blowing is the sheet thickness stream interface that falls uniformly, and stream interface thickness is the best with 3-4 centimetre, and the width no requirement (NR) only need be widened nozzle during wider width to reach the whereabouts stream shape that meets blowing.But be difficult to accomplish that a fluid stream thickness meets 3-4 centimetre of requirement during a fluid stream broad.For obtaining stream interface preferably, the sagging shape of twitching one's mouth that is shaped as of the groove slag notch of jetting, concrete shape is seen accompanying drawing 1.
2, the blowing of slag wool: blow the spheroid that is shaped as of cotton chamber, diameter 6-8 rice, length 40-50 rice, the inwall refractory materials, in order to be incubated thermal insulation, the bottom is established conical discharge mouth 3-5, is not blown to the slag charge of mineral wool in order to regular removing.With high pressure nitrogen or pressurized air (both all can, pressure is 0.6-1.0Mpa) winding-up high-temperature slag, produce slag wool.Process is: enter the winding-up groove by the oxygen blast effusive deployed high-temperature slag of groove of heating, after the materials flow shaping, flow out from notch, the outlet of winding-up groove is on the top of blowing cotton chamber one end, the outlet of winding-up groove is the pencil nozzle for bottom 30-50 centimetre, being blowed materials flow flows out, falls from the outlet of winding-up groove, the pencil nozzle is a branch of transverse jet pore and the vertical with it jet hole of two bundles, the vertical with it jet hole of two bundles is at the two ends of horizontal pore bundle, with horizontal pore Shu Zucheng U font, adjacent pore hole is in the heart apart from 15-40 millimeter (25-30 millimeter the best).Hole diameter is 5-10 millimeter (a 6-8 millimeter for best), jet direction be level slightly upwards (with horizontal sextant angle 10-15 degree) vertical with materials flow face.The winding-up flow is every cubic metre of slag 2000-3500 cubic meter nitrogen (or air).The outlet of pencil nozzle pore is apart from high-temperature slag 20-60 centimetre that falls (30-40 centimetre is best).The slag wool fiber diameter 6-8 micron that blows out.Blowing cotton indoor slag wool concentration is 400-700 gram/cubic meter, and blowing cotton chamber pressure is-0.3--1.5Kpa (pressure is by the air-breathing generation of main exhauster) to blow cotton chambers temp 700-1200 degree.For guaranteeing that blowing bottom, cotton chamber can not produce the slag wool deposition, will purge the bottom with nitrogen or pressurized air.
3, waste heat recovery: the waste heat recovery part absorbs the high temperature mineral wool that blows the generation of cotton chamber and the heat of air mixture, produces high-temperature steam from heat exchanger.Waste heat is effectively absorbed, after heat exchange is finished, heat exchanger outlet temperature 200-300 degree.
4, the collection of slag wool: gas after waste heat recovery and slag wool mixture, by the cloth bag collector slag wool is caught collection.
5, waste residue recycle: blow cotton indoor happy and harmonious raw material is blown when obtaining the cotton mixture of High Temperature Gas, have the part slag and be not blown to cotton-shapedly, fall into and blow bottom, cotton chamber, assemble at residue mouth place, regularly take out residue, add recycle in the slag chute with the addition material form.
Embodiment 1: tap cinder mouth slag temperature is 1498 degree, basicity 1.09 (2 yuan of basicity), add ground silica (wheat silica powder when flowing through slag chute 1, dioxide-containing silica 99%), adjusting back basicity is 1.03, without heating from the oxygen blast groove 2 effusive high-temperature slag temperature of heating is 1460 degree, and effusive to blow cotton slag temperature be 1445 degree from winding-up groove 3, and slag stream thickness is about 3 centimetres, width is about 22 centimetres, nozzle 4 horizontal hole counts are 16, and the hole heart is apart from 1.5 centimetres, and 10 of the every rows of vertical cores are arranged in both sides vertical with it two, hole heart distance is 1 centimetre, all spray orifice apertures are 8 millimeters, and high pressure nitrogen (0.8Mpa) is from the 4 very fast ejections of pencil nozzle, with fall blow cotton slag obliquely upward Spray rise, form the cotton-shaped slag wool of high temperature, float on and blow in the cotton chamber 5, the high pressure nitrogen flow is 6 kilosteres per hour, and the flow of slag stream is per hour 8 cubic metres.Blow the cotton indoor hot gas that is mixed with a large amount of slag wools and enter heat exchanger 6, carry out heat exchange, produce high-temperature steam.The hot gas that is mixed with a large amount of mineral wools flows out the back temperature from heat exchanger and is reduced to 250 degree, enters mineral wool cloth bag collector 7 again, and the clean gas after the cloth bag collector is collected enters atmosphere from chimney 9 behind main exhauster 8.Winding-up bottom, chamber has the long-pending bottom that falls within of the slag that does not form on a small quantity mineral wool, blows the cotton phase cleaning residue mouth 10 that finishes and obtains the particulate state residue, and diameter 1-10 millimeter reclaims form with additive with residue and adds the new slag from slag chute and utilize.
Embodiment 2: tap cinder mouth slag temperature is 1520 degree, basicity 1.08 (2 yuan of basicity), add ground silica (wheat silica powder when flowing through slag chute 1, dioxide-containing silica 99%), be 1.05 after the adjustment, without heating from the oxygen blast groove 2 effusive high-temperature slag temperature of heating is 1485 degree, and effusive to blow cotton slag temperature be 1475 degree from winding-up groove 3, and slag stream thickness is about 3 centimetres, width is about 22 centimetres, nozzle 4 horizontal hole counts are 16, and the hole heart is apart from 1.5 centimetres, and 10 of the every rows of vertical cores are arranged in both sides vertical with it two, hole heart distance is 1 centimetre, all spray orifice apertures are 8 millimeters, and high pressure nitrogen (0.8Mpa) is from the 4 very fast ejections of pencil nozzle, with the mineral wool blowing material that falls obliquely upward Spray rise, form the cotton-shaped slag wool of high temperature, float on and blow in the cotton chamber 5, the high pressure nitrogen flow is 6 kilosteres per hour, and the flow of slag stream is per hour 8 cubic metres.Blow the cotton indoor hot gas that is mixed with a large amount of slag wools and enter heat exchange chamber 6, carry out heat exchange, produce high-temperature steam.The hot gas that is mixed with a large amount of mineral wools flows out the back temperature from heat exchanger and is reduced to 275 degree, enters mineral wool cloth bag collector 7 again, and the clean gas after the cloth bag collector is collected enters atmosphere from chimney 9 behind induced-draft fan 8.Winding-up bottom, chamber has the long-pending bottom that falls within of the slag that does not form on a small quantity mineral wool, blows the cotton phase cleaning residue mouth 10 that finishes and obtains the particulate state residue, and diameter 1-10 millimeter reclaims form with additive with residue and adds the new slag from slag chute and utilize.
Claims (5)
1. an equipment that utilizes blast furnace slag operating mine slag wool is characterized in that, comprise slag groove, oxygen blast heat groove, the winding-up groove, pencil nozzle, blow cotton chamber, heat exchanger, cloth bag collector, main exhauster and chimney; Slag groove, oxygen blast heat groove, the groove of jetting, blow cotton chamber, heat exchanger, cloth bag collector, main exhauster and chimney successively head and the tail is connected, the pencil nozzle is positioned at winding-up groove below, the high temperature molten slag provides source of the gas in order to jet; The outlet of winding-up groove is on the top of blowing cotton chamber one end, the outlet of winding-up groove is the sagging shape of twitching one's mouth for bottom 30-100 centimetre, and the sagging angle of twitching one's mouth becomes the 5-45 degree with level, twitch one's mouth mouthful width 5-50 centimetre, twitch one's mouth mouthful thickness 3-7 centimetre, can reach maximum per hour 80 tons flow; The oxygen blast groove of heating is a rectangular parallelepiped, and the oxygen blast warming portion is at the middle part, and there is 1～3 outlet the back; Blow the spheroid that is shaped as of cotton chamber, the bottom is established conical discharge mouth 3-5.
2. equipment according to claim 1 is characterized in that, the sagging angle of twitching one's mouth becomes the 15-30 degree with level, twitches one's mouth mouthful thickness 4-5 centimetre.
3. equipment according to claim 1 is characterized in that, 40～100 regular arranging of gas orifice are arranged on the pencil nozzle, and adjacent pore hole is in the heart apart from the 15-40 millimeter; Wherein a part of gas orifice level is in line, and gas orifice is vertically lined up two row in addition, lays respectively at the both sides of a horizontal venting hole, forms a U font with a horizontal venting hole; Laterally the spreads of pore and the winding-up groove mouthful width of twitching one's mouth is corresponding, and is wider than the groove of jetting and twitches one's mouth mouthful width 4-6 centimetre; Vertically height 15-50 centimetre of the pore arrangement.The diameter of each Spray pore is the 5-10 millimeter, and the hole heart distance of adjacent two gas orifices is the 15-40 millimeter; The pencil jet size should mate with the mouth of twitching one's mouth of winding-up groove outlet, adapts to the winding-up concentrated flow and goes out the width and the thickness of high-temperature slag materials flow.
4. method that adopts the described equipment utilization blast furnace slag of claim 1 blowing slag wool is characterized in that technology is:
(1) modulation of blast furnace slag: effusive slag iron is the high temperature fluid of 1450-1550 degree through the isolated blast furnace slag of fecal iron separator from the blast furnace casting stokehold, basicity is at 1.05-1.15, adding basicity adjustment agent adjusts to basicity between the 1.0-1.10, it is evenly unrestrained to the slag surface from the slag chute afterbody that basicity is adjusted agent, after adding basicity adjustment agent, the oxygen blast that slag the flows into drop 0.2-1.0 rice groove of heating, the oxygen blast coal pipe of heating in the groove is blown into oxygen blast after mixed and heats during slag flows in the groove with oxygen lance, after heating, slag stream temperature 1450-1500 degree scope;
(2) blowing of slag wool: with high pressure nitrogen or pressurized air, pressure is 0.6-1.0Mpa, and the winding-up high-temperature slag is produced slag wool; Process is: enter the winding-up groove by the oxygen blast effusive deployed high-temperature slag of groove of heating, after the materials flow shaping, flow out from notch, the materials flow that is blowed is flowed out, is fallen from the outlet of winding-up groove, and pencil nozzle winding-up flow is every cubic metre of slag 2000-3500 cubic meter nitrogen or air; The slag wool fiber diameter 6-8 micron that blows out; Blowing cotton indoor slag wool concentration is 400-700 gram/cubic meter, and blowing cotton chamber pressure is-0.3--1.5Kpa to blow cotton chambers temp 700-1200 degree; For guaranteeing that blowing bottom, cotton chamber can not produce the slag wool deposition, will purge the bottom with nitrogen or pressurized air;
(3) waste heat recovery: the high temperature mineral wool that blows the generation of cotton chamber and the heat of air mixture are absorbed, produce high-temperature steam from heat exchanger; Waste heat is effectively absorbed, after heat exchange is finished, 200-300 degree centigrade of exchanger outlet temperature;
(4) collection of slag wool: gas after waste heat recovery and slag wool mixture, by the cloth bag collector slag wool is caught collection;
(5) waste residue recycle: blow cotton indoor happy and harmonious raw material is blown when obtaining the cotton mixture of High Temperature Gas, have the part slag and be not blown to cotton-shapedly, fall into and blow bottom, cotton chamber, assemble at residue mouth place, regularly take out residue, add recycle in the slag chute with the addition material form.
5. equipment according to claim 1 is characterized in that, it is ground silica, basalt powder or andesite powder that described basicity is adjusted agent.
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| CN2010102113877A CN101891378B (en) | 2010-06-29 | 2010-06-29 | Equipment and method for producing slag wool by utilizing ironmaking slag |
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| CN2010102113877A CN101891378B (en) | 2010-06-29 | 2010-06-29 | Equipment and method for producing slag wool by utilizing ironmaking slag |
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| CN102787185A (en) * | 2012-08-31 | 2012-11-21 | 周学义 | Energy-saving production method of mineral wool insulation boards in iron and steel companies |
| CN102826747A (en) * | 2012-08-31 | 2012-12-19 | 朱兴发 | Method used for meeting requirement on mineral wool production with short process |
| CN102838274A (en) * | 2011-06-23 | 2012-12-26 | 青岛青力环保设备有限公司 | Method for producing solidified slag rock wool by smoke afterheat and slag of cupola furnace |
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| CN102838274A (en) * | 2011-06-23 | 2012-12-26 | 青岛青力环保设备有限公司 | Method for producing solidified slag rock wool by smoke afterheat and slag of cupola furnace |
| CN102787185A (en) * | 2012-08-31 | 2012-11-21 | 周学义 | Energy-saving production method of mineral wool insulation boards in iron and steel companies |
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