CN103555874A - Thermal refining method of blast furnace hot slags - Google Patents
Thermal refining method of blast furnace hot slags Download PDFInfo
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- CN103555874A CN103555874A CN201310486455.4A CN201310486455A CN103555874A CN 103555874 A CN103555874 A CN 103555874A CN 201310486455 A CN201310486455 A CN 201310486455A CN 103555874 A CN103555874 A CN 103555874A
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Abstract
The invention provides a thermal refining method of blast furnace slags. The thermal refining method of blast furnace slags comprises the following steps of: transfer and temporary storage of hot slag, primary tempering process of hot slags, secondary tempering process of hot slags and fine control. The hot slag tempering system is capable of directly realizing sufficient utilization of sensible heat of the hot slags; and a feasible process is provided for the preparation of products such as microlite materials and mineral wool from blast furnace slags.
Description
Technical field
The application relates to the method for utilizing of the hot slag of a kind of blast furnace, and more particularly, the application relates to the hardening and tempering method of the hot slag of a kind of blast furnace.
Background technology
Blast furnace slag is a kind of waste residue of discharging from blast furnace while smelting the pig iron, and along with the development of China's Iron And Steel Industry, blast-furnace slag discharge capacity is increasing, and pile up like a mountain over the years, takies a large amount of soils.Because Iron and Steel Enterprises in China adopts water quenching technology conventionally, process blast furnace warm sludge, the sensible heat that melted gangue carries is not only utilized, and has wasted on the contrary valuable water resources, and the sewage of generation and sulfur-bearing steam cause severe contamination to environment.Existingly take blast furnace waste residue and as raw material, make cement additire, roadbed or ground based filler, aggregate etc. and utilize mode all not consider the heat energy that blast furnace slag is contained, and eat the recycling difficult problem that the reasons such as the quantity of slag is little, added value is low, production cost is high do not solve blast furnace slag because of product.
According to the special raw material of the hot slag of blast furnace and heat energy advantage, proposition is turned waste into wealth, the method for comprehensive utilization of thermal-arrest consumption reduction, is only metallurgy, iron and steel, the energy industry feasible outlet in blast furnace waste residue utilization.From chemical composition, blast-furnace slag belongs to phyllosilicate material, is again the molten mass forming under 1400 ℃～1600 ℃ high temperature, and its main component is SiO
2, CaO, A1
2o
3, MgO etc., be to form especially CaO-Al of glass
2o
3-SiO
2the important component of system glass, subsidiary sensible heat can be well also a large amount of energy of later stage glass smelting saving.Therefore, glass, ceramic-like stone product can become a direction of blast-furnace slag Efficient Development, utilize blast furnace waste residue to prepare can to substitute the crystallite stone material of marble, grouan, especially a kind of two-way environmental protection and benefited technology.
The utilization of blast furnace waste residue is at present main raw material mainly with the Water Quenching Slag of cold conditions, high temperature melting after mixing with part chemical feedstocks, by glass melt chilling aftershaping, through annealing, carry out at a certain temperature crystallization and coring, to obtain the crystallized glass article of the tiny and even structure of crystal grain.But these production technique all be take cold conditions slag charge as raw material, and in the operations such as high temperature melting, abrasive dust and thermal treatment, energy consumption is high, causes the production cost of cinder microcrystalline glass higher.
In order to solve heat energy and the water resource waste problem causing in blast furnace cinder water quenching processing, some utilize the process imagine of the hot slag direct production of blast furnace cinder microcrystalline glass to be proposed gradually, but there is not the clear and definite hot slag of proposition to utilize the ins and outs such as mode and hardening and tempering process thereof at present, be difficult to realize the vast scale interpolation of blast furnace waste residue, can not consume the current metallurgical a large amount of waste residues that produce.
Summary of the invention
In order to solve the problems of the prior art, the invention provides the hardening and tempering method of the hot slag of a kind of blast furnace, the hardening and tempering method of the hot slag of described blast furnace comprises hot slag transhipment and buffer memory, hardening and tempering process of hot slag, hot slag secondary hardening and tempering process and meticulous control.
In described hot slag transhipment and buffer memory step, by cinder ladle or slag ladle, from tap cinder mouth, connect slag, transportation is transferred in the storage slag bath in modified place, and cinder ladle and slag ladle are provided with auxiliary heating system, and in transfer process, slag temperature is not less than 1350 ℃.
In described hot slag transhipment and buffer memory step, by the mode in Liu Zha road is set at blast furnace slag-drip opening, liquid blast furnace slag is drained in the storage slag bath of tempering system under action of gravity from table eminence, Liu Zha road is provided with heating unit, the slag road gradient is not more than 1km between 1～3 °，Zha road length.
According to modified composition, require to select after corresponding auxiliary material, after auxiliary material pretreatment system carries out proportioning, weighs, heats and melts, by charging opening or stream material hole, synchronize and be introduced in one-level hardening and tempering furnace with the hot slag of blast furnace.
Solid-state auxiliary material directly joins in one-level hardening and tempering furnace by charging opening.
Solid adjuvant material melts in advance by dog-hole and hot slag and is jointly incorporated in one-level hardening and tempering furnace with liquid-liquid hybrid mode.
The temperature of one-level hardening and tempering furnace and secondary hardening and tempering furnace is between 1350～1500 ℃, and outfit is stirred, the homogenization device of bubbling, and meticulous control work pool arranges melt liquid level monitoring equipment, and realizes liquid level with the interlock of secondary hardening and tempering furnace dog-hole and stablize.
According to the hardening and tempering method of the hot slag of blast furnace of the present invention, by utilizing hot blast furnace slag, take full advantage of the sensible heat of high-temperature slag, improved the utilising efficiency of blast furnace slag.
Accompanying drawing explanation
Fig. 1 shows the schema of the hardening and tempering method of the hot slag of blast furnace according to an exemplary embodiment of the present invention.
Embodiment
For overcoming the domestic shrend waste residue that utilizes at present, especially utilize the high shortcoming of shrend waste residue slakin devitrified glass energy consumption, be expected to break through the treatment process (even blast furnace smelting technique) of traditional blast furnace slag.The present invention proposes the direct hardening and tempering method of the hot slag of a kind of blast furnace, the hardening and tempering method of the hot slag of blast furnace of the present invention, by composition, temperature and the physicochemical property of modifier treatment blast furnace slag, makes it in fields such as glass, potteries, have abundanter, more direct purposes.
With reference to Fig. 1, according to the hardening and tempering method of the hot slag of blast furnace of the present invention, comprise the steps:
1, hot slag transhipment and buffer memory
For make high furnace slag discharge mode and high temperature slag heat decay characteristic and modified after the slag utilization link such as melt forming, thermal treatment process keep certain continuity and matching, the present invention proposes to utilize insulation slag ladle and adds two kinds, hot-fluid slag road mode, and liquid high temperature waste residue is shifted and leaves blast furnace table to tempering system or nearly using area.
Hot slag shifts can take discontinuity tranfer system according to blast furnace warm sludge discharge characteristics and waste residue operational version,, by cinder ladle or slag ladle, from tap cinder mouth, connect slag, by vehicle transport, be transferred in the storage slag bath in modified place, cinder ladle and slag ladle are provided with auxiliary heating system, and heating can adopt electrically heated or gaseous combustion heating.
Shift and also can take continuous tranfer system,, the mode that Liu Zha road is set at blast furnace slag-drip opening by liquid blast furnace slag from table eminence, under action of gravity, drain in tempering system, wherein Liu Zha road is provided with heating unit equally, preferably the ，Zha road gradient is not more than 1km between 1～3 °，Zha road length.
Above-mentioned warm sludge shifts or transport process, requires slag temperature in transfer process to be not less than 1350 ℃, to guarantee that slag can have certain mobility, is also convenient in hardening and tempering furnace, topple over and stir.When being greater than 1km, slag shipment distance can only adopt the transporting mode of cinder ladle or slag ladle.
2, hardening and tempering process of hot slag
One time hardening and tempering process mainly carries out in one-level hardening and tempering furnace, most important link between one-level hardening and tempering furnace is used as blast furnace and later stage melt, except playing buffering, gather materials and act on, also born change bath composition, temperature, inhomogeneity vital role.According to modified rear melt utilize mode different, once modified introduced supplementary product kind, introduction volume and melting process are all not identical.
After introducing supplementary product kind and introduction volume and determining, the mode that adds (being that liquid liquid mixes) after can adopting respectively auxiliary material directly to add (being that solid-liquid mixes) and auxiliary material melting, original slag melt is carried out to composition modified, the modes such as utilization during this time reheats, stirring, bubbling increase fluidity of molten and homogeneity, after melt chemical composition, temperature, viscosity reach continuous production requirement, by material road or stream material mouth, enter secondary hardening and tempering furnace.
Wherein, when auxiliary material is introduced with liquid liquid mixed form, auxiliary material should be after pre-treatment link proportioning be weighed, is mixed, be heated to fusing, can jointly import in one-level hardening and tempering furnace in corresponding ratio and melted gangue, also can be that two strands of melts are proportionally set to conflux simultaneously and entered one-level hardening and tempering furnace, increase mixedness.
3, hot slag secondary hardening and tempering process
In secondary hardening and tempering furnace, melt is carried out to the further fusing such as concurrent heating, stirring, bubbling, homogenizing processing, complete later stage melt and utilize required temperature, viscosity and uniformity requirement, secondary hardening and tempering furnace also can be used as the buffer memory stove of modified good melt simultaneously, coordinates meticulous control work pool of later stage to complete the accurate control of liquid stream, liquid level height, temperature.Secondary hardening and tempering furnace is communicated with follow-up work pond by controlled stream material mouth.
Preferably, the temperature of one-level hardening and tempering furnace and secondary hardening and tempering furnace is between 1350～1500 ℃.
4, meticulous control
According to the mode of utilizing of later stage melt, at meticulous control work pool, the important process parameters such as the liquid level of modified rear melt, discharge form, confession flow quantity and melt temperature, viscosity are carried out to meticulous control, to adapt to the demand of various processes and product.
Provide concrete example to explain the hardening and tempering method of the hot slag of blast furnace of the present invention below.
Example 1:
Utilize hot blast furnace slag hardening and tempering method to prepare slag stone material
Prepare slag stone raw material proportioning as shown in the table.
| Raw material | Blast-furnace slag | Quartz sand | Soda ash | Fluorite | Sodium Silicofluoride | Phosphoric acid hydrogen ammonia | Zinc oxide |
| Mass fraction | 60 | 40 | 11 | 6 | 2 | 2 | 1.5 |
1) according to the reserves of proportioning raw materials and one-level hardening and tempering furnace, utilize insulation cinder ladle from 6 tons of the hot slags of the disposable access blast furnace of blast furnace slag flow port, and be transported to modified place and slag stone material production line by acting trailer system, and pour into subsequently in storage slag bath, be incubated 1400 ℃.
2), according to proportioning raw materials configuration 6.25 tons of quartz sands, soda ash, fluorite, Sodium Silicofluoride, ammonium hydrogen phosphate and zinc oxide, utilize auxiliary material smelting furnace that auxiliary material is melted to 1.5h to meltings completely at 1480 ℃.
3) open one-level hardening and tempering furnace and the fluid port that stores up slag bath, auxiliary material smelting furnace, proportionally make 6 tons of hot slags and corresponding molten state auxiliary material be injected into one-level hardening and tempering furnace simultaneously, now one-level hardening and tempering furnace temperature remains 1480～1500 ℃, under thermograde and melt flow effect, 1～1.5h tentatively realizes two kinds of melt-mixing.
4) open subsequently the dog-hole of one-level hardening and tempering furnace and secondary hardening and tempering furnace, mixed melt in one-level hardening and tempering furnace is slowly transferred in secondary hardening and tempering furnace, now secondary hardening and tempering furnace temperature is between 1450～1480 ℃, after melt is all transferred to secondary hardening and tempering furnace, open stirring homogenization device, after insulated and stirred 1～1.5h, realize the even mixing of two kinds of melts.
5) open subsequently secondary hardening and tempering furnace and accurately control the dog-hole between work pool, make modified uniform mixed melt slowly flow into meticulous control work pool, and the height monitoring switch of dog-hole valve and meticulous control work pool interlock, melt liquid level height stable of realizing meticulous control work pool, now the temperature of meticulous control work pool is between 1400～1450 ℃.
6) modified qualified melt enters glass pressing machine through work pool supply channel, discharge port, be pressed into the thick parent glass sheet material of 12～13mm, enter subsequently annealing roller kiln and crystallization roller kiln, through 750 ℃ of coring 1h, process, after 860 ℃ of crystallization 1h process, slow cooling, to coming out of the stove, can obtain slag microlite material products.
In production line and tempering system non-stop run situation, according to production material starting time interval, slag waggon, auxiliary material are founded and are taked intermittently feed way, until last time in one-level hardening and tempering furnace, mixed melt was injected new material after entering secondary hardening and tempering furnace, secondary hardening and tempering furnace and meticulous control work pool need to take automatic control mode to control melt injection according to working level height, and then realize later stage feed, calendering, heat treated steady and continuous.
Example 2: utilize hot slag hardening and tempering method to prepare slag glass cotton
| Raw material | Blast-furnace slag | Quartz sand | Feldspar | Basalt | Rhombspar |
| Mass fraction | 60 | 10 | 10 | 10 | 10 |
1) utilize the mode in heating blast furnace Liu Zha road, Liu Zha road slope design is 1 °, extend the mobile distance of blast furnace slag, directly hot blast furnace slag is transferred in 500 meters of tempering systems and near storage slag bath glass wool production line in addition, it is more than 1400 ℃ that storage slag bath keeps temperature.
2) 2 proportioning raw materials by example, 6 tons of hot blast furnace slags are transferred in one-level hardening and tempering furnace by slag flow port, now the temperature of one-level hardening and tempering furnace is 1500 ℃, utilize that auxiliary material is weighed, mixing system takes the blended solids such as 4 tons of quartz sands, feldspar, basalt, rhombspar according to upper table, the solid-state charging mouth by one-level hardening and tempering furnace is slowly added in one-level hardening and tempering furnace simultaneously.
3) after in one-level hardening and tempering furnace, above-mentioned mineral auxiliary material melts completely, open the fluid port between one-level hardening and tempering furnace and secondary hardening and tempering furnace, by preliminary modified melt transfer to secondary hardening and tempering furnace, now the temperature of secondary hardening and tempering furnace is 1480 ℃, through being incubated, stirring after 2～4h, make modified melt further even.
4) after the modified composition of melt, homogeneity are qualified, melt enters meticulous control work pool through dog-hole, and according to glass wool preparation technology requirement, work pool temperature is controlled between 1350～1400 ℃.
5) modified qualified melt is flowed out by work pool stream material mouthful, through movable chute, be imported into whizzer and become glass fibre, under the compound action of centrifugal force and high velocity air, fiber blows to cotton collecting machine, with preparing slag glass cotton board material by equipment such as the cotton band of collection, pendulum bob machine, press, curing ovens.
According to the hardening and tempering method of the hot slag of blast furnace of the present invention, by utilizing hot blast furnace slag, take full advantage of the sensible heat of high-temperature slag, improved the utilising efficiency of blast furnace slag.
Claims (7)
1. a hardening and tempering method for the hot slag of blast furnace, is characterized in that the hardening and tempering method of the hot slag of described blast furnace comprises hot slag transhipment and buffer memory, hardening and tempering process of hot slag, hot slag secondary hardening and tempering process and meticulous control.
2. the hardening and tempering method of the hot slag of blast furnace according to claim 1, it is characterized in that in described hot slag transhipment and buffer memory step, by cinder ladle or slag ladle, from tap cinder mouth, connect slag, transportation is transferred in the storage slag bath in modified place, cinder ladle and slag ladle are provided with auxiliary heating system, and in transfer process, slag temperature is not less than 1350 ℃.
3. the hardening and tempering method of the hot slag of blast furnace according to claim 1, it is characterized in that in described hot slag transhipment and buffer memory step, by the mode in Liu Zha road is set at blast furnace slag-drip opening, liquid blast furnace slag is drained in the storage slag bath of tempering system under action of gravity from table eminence, Liu Zha road is provided with heating unit, the slag road gradient is not more than 1km between 1～3 °，Zha road length.
4. the hardening and tempering method of the hot slag of blast furnace according to claim 1, it is characterized in that selecting after corresponding auxiliary material according to modified composition requirement, after auxiliary material pretreatment system carries out proportioning, weighs, heats and melts, by charging opening or stream material hole, synchronize and be introduced in one-level hardening and tempering furnace with the hot slag of blast furnace.
5. the hardening and tempering method of the hot slag of blast furnace according to claim 4, is characterized in that solid-state auxiliary material directly joins in one-level hardening and tempering furnace by charging opening.
6. the hardening and tempering method of the hot slag of blast furnace according to claim 4, is characterized in that, solid adjuvant material melts in advance by dog-hole and hot slag and is jointly incorporated in one-level hardening and tempering furnace with liquid-liquid hybrid mode.
7. the hardening and tempering method of the hot slag of blast furnace according to claim 1, it is characterized in that the temperature of one-level hardening and tempering furnace and secondary hardening and tempering furnace is between 1350～1500 ℃, and outfit is stirred, the homogenization device of bubbling, meticulous control work pool arranges melt liquid level monitoring equipment, and realizes liquid level with the interlock of secondary hardening and tempering furnace dog-hole and stablize.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104370455A (en) * | 2014-11-19 | 2015-02-25 | 鞍山钢铁集团公司矿渣开发公司 | Method and device for producing mineral wool by matching molten-state blast furnace slag with mine tailings |
| CN106082678A (en) * | 2016-05-30 | 2016-11-09 | 中冶赛迪工程技术股份有限公司 | Vessel slag utilization of resources equipment and technique thereof |
| CN106435060A (en) * | 2016-09-30 | 2017-02-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Modifying method of titanium-contained slag in molten iron |
| CN108546132A (en) * | 2018-05-08 | 2018-09-18 | 东北大学 | A method of preparing foamed ceramic material using blast furnace hot molten slag |
| CN112484503A (en) * | 2020-12-11 | 2021-03-12 | 交城义望铁合金有限责任公司 | Device for transporting hot melting slag |
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| CN1400181A (en) * | 2002-09-02 | 2003-03-05 | 严煜 | Method for hot-charging, smelting and producing mineral wool fibre by adopting blast furnace |
| CN103204628A (en) * | 2012-01-16 | 2013-07-17 | 宝山钢铁股份有限公司 | Process method and apparatus for directly producing mineral wool from thermal state blast furnace slag |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400181A (en) * | 2002-09-02 | 2003-03-05 | 严煜 | Method for hot-charging, smelting and producing mineral wool fibre by adopting blast furnace |
| CN103204628A (en) * | 2012-01-16 | 2013-07-17 | 宝山钢铁股份有限公司 | Process method and apparatus for directly producing mineral wool from thermal state blast furnace slag |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104370455A (en) * | 2014-11-19 | 2015-02-25 | 鞍山钢铁集团公司矿渣开发公司 | Method and device for producing mineral wool by matching molten-state blast furnace slag with mine tailings |
| CN104370455B (en) * | 2014-11-19 | 2016-09-14 | 鞍山钢铁集团公司矿渣开发公司 | It is equipped with mill tailings with melt blast-furnace cinder and produces the method and device of mineral wool |
| CN106082678A (en) * | 2016-05-30 | 2016-11-09 | 中冶赛迪工程技术股份有限公司 | Vessel slag utilization of resources equipment and technique thereof |
| CN106082678B (en) * | 2016-05-30 | 2019-05-24 | 中冶赛迪工程技术股份有限公司 | Vessel slag utilization of resources equipment and its technique |
| CN106435060A (en) * | 2016-09-30 | 2017-02-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Modifying method of titanium-contained slag in molten iron |
| CN106435060B (en) * | 2016-09-30 | 2019-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of modifying of titanium-containing slag in a kind of molten iron |
| CN108546132A (en) * | 2018-05-08 | 2018-09-18 | 东北大学 | A method of preparing foamed ceramic material using blast furnace hot molten slag |
| CN108546132B (en) * | 2018-05-08 | 2020-07-17 | 东北大学 | Method for preparing foamed ceramic material by using blast furnace hot slag |
| CN112484503A (en) * | 2020-12-11 | 2021-03-12 | 交城义望铁合金有限责任公司 | Device for transporting hot melting slag |
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Application publication date: 20140205 |