CN101560581B - Rotary furnace cooling agent and manufacturing method thereof - Google Patents
Rotary furnace cooling agent and manufacturing method thereof Download PDFInfo
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- CN101560581B CN101560581B CN2009100116011A CN200910011601A CN101560581B CN 101560581 B CN101560581 B CN 101560581B CN 2009100116011 A CN2009100116011 A CN 2009100116011A CN 200910011601 A CN200910011601 A CN 200910011601A CN 101560581 B CN101560581 B CN 101560581B
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Abstract
The invention provides a rotary furnace cooling agent and a manufacturing method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic dry ash and ferreous dry waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to0.50%. The manufacturing method comprises: the iron scale, the carbonic dry ash and the ferreous dry waste material are firstly sent into a blending machine to be mixed together and evenly mixed with the caking agent; after being evenly mixed, the materials are sent into a mixing mill and then into a twin-roller ball press machine to be pressed into conglomeration; the pressed conglomeration is s creened by a sieving machine, and the qualified screened conglomeration can be sent into a dry furnace to be dried, so that the finished product conglomeration can be obtained. The rotary furnace cooling agent can be used for replacing the common waste steel to be applied in smelting of a rotary furnace; compared with the prior art, the cooling agent completely uses the waste materials generated in the steel production, so that the process flow is short, the cost is low, the using method is flexible, the adding quantity is large, the recovery rate is high, the field operation is seldom affected, the economic benefit and the environmental protection benefit are remarkable, and the promotion and application values are excellent.
Description
Technical field
The invention belongs to metallurgical waste recycling field, relating in particular to a kind of is the rotary furnace cooling agent and the manufacture method thereof of raw material with metallurgical waste.
Background technology
In order to have made slag, morningization slag and control molten steel optimal temperature need add cooling, fusing assistant in convertor steelmaking process.
Traditional cooling, fusing assistant comprise massive iron ore, steel scrap, fluorite, lime etc.When being the cooling fusing assistant with the massive iron ore, because the massive iron ore iron-holder is low, main component mostly is difficult reductive ferric oxide, and mostly be acid ore deposit, not only recovery rate of iron is low, and the quantity of slag is increased, lining life reduces, and does not also have fusing assistant effect preferably; When being cooling, fusing assistant with steel scrap, lime and fluorite, home scrap is under-supply on the one hand, price change is bigger during outsourcing, cost is higher, a large amount of addings of lime and fluorite have not only increased cost on the other hand, and do not meet the technology trends that converter smelting lacks slag operation, be unfavorable for steel quality control.
Along with the pay attention to day by day of iron and steel enterprise to energy-saving and emission-reduction, the metallurgical waste converted products is as converter cooling, fusing assistant utilization, both save the outer circulation of metallurgical waste enterprise and utilized required equipment and place investment, reduced the waste discharge amount again, economic benefit and environmental benefit are obvious, have the excellent popularization prospect.
At present, some are the rotary furnace cooling agent made of raw material and the patent of invention of converter slag fusing assistant with the metallurgical waste, all have certain deficiency.As application number is 99112573.8, and the Chinese patent of " converter cooling, fusing assistant " by name is a raw material with iron scale, steel-smelting sewage sludge, binding agent, and making method is mixed in proportion batching, is crushed to＜32 orders through grinding machine, and the pressure ball moulding is a finished product.This patent is similar to the iron sheet ball (is that raw material and adding additives is made with steel scale of steel rolling, revolving furnace mud etc.) that present steel enterprise adopts, in actual converter smelting, add fashionable, because of itself FeO content higher, easily cause splash during converter smelting, run slag, the slag phenomenon of overflowing is serious, influence smelting operation, limited the add-on of iron sheet ball.And need in this product processing raw material crushings such as iron scales to have increased the technology cost to＜32 orders.Application number is CN101270403A, and the Chinese patent of by name " slugging fluxing agent of steel-smelting revolving furnace " is that 100: 50～120: 50～120 waste steel slag, iron scale and manganese ore powder are raw material with weight ratio, mixes press forming with tackiness agent.This product only conductization slag fusing assistant uses, and add-on is less, is difficult to digest a large amount of metallurgical waste materials, and the certain manganese ore powder of its finished product consumption, has increased cost.
And some other cold solid agglomerate that utilizes iron ore concentrate etc. for development of raw materials, can be used as rotary furnace cooling agent, as application number is 200480023510.5, after making agglomerate, the binding agent that the Chinese patent of by name " autoreduction, cold solid agglomerate " utilizes iron ore concentrate, carbon containing reducer and has a particular requirement uses in blast furnace ironmaking, non-blast furnace ironmaking and the steel-making of various steel melting furnace again, but the used raw material of this invention all is a fine fodder, and the granularity to raw material has certain requirement, and raw materials cost, tooling cost are all higher.In addition, each patent all can not replace present steel mill steel scrap resource in short supply to use more than.
Summary of the invention
The purpose of this invention is to provide a kind of is the rotary furnace cooling agent and the manufacture method thereof of raw material with the dried waste material of metallurgy, can replace ordinary scrap steel, cost is low, effective, and can overcome the deficiency that has cooling, fusing assistant existence now, solving Steel Plant's carbon containing iron-containing waste can not efficiently utilize, and steelworks is because the outsourcing steel scrap causes problems such as the rapid rising of cost.
The present invention utilizes the carbon containing iron content waste that is produced in the existing steel manufacture process, replaces the required ordinary scrap steel of converter smelting to use behind the drying pressure ball.The carbon containing iron content agglomerate that the present invention handles has been introduced certain fine carbon powder because of allocating carbon containing dry ash (gas ash, blast-furnace dust, charred ashes) into, characteristics with autoreduction, under the condition of not adding other reductive agents, can in converter, the ferriferous oxide autoreduction in the raw material be tapped a blast furnace, do not influence simultaneously the thermal environment in the converter, less to steel-making reaction process influence in the converter.So just solved in the rotary furnace cooling agent that other iron-containing wastes make because FeO content is higher, easily caused splash during converter smelting, run slag, the slag phenomenon of overflowing is serious, and influenced smelting operation, and then limited the problem of add-on.
The present invention be a kind of be the rotary furnace cooling agent of raw material with the dried waste material of metallurgy, its manufacture method is achieved in that
(1) batching: according to various carbon containing iron-containing wastes to be processed, comprise iron scale, carbon containing dry ash, the dried waste material of iron content, carry out charge calculation according to its main component, the weight percent of main chemical compositions in the carbon containing iron content agglomerate is met the following conditions: carbon content is 5%～25%, TFe 〉=50%, S≤0.50%, P≤0.50%.
If crossing low, carbon content can not satisfy the needs of agglomerate autoreduction; And carbon content is excessive, will cause carbon increase in the converter, forms excessive foamy slag easily, run slag, the slag phenomenon of overflowing is serious, influence converter smelting operation, and the carbon in the agglomerate is introduced by the carbon containing dry ash, the increase of carbon content must cause S, P content to raise, and TFe content descends, and economic benefit reduces.And TFe content height, then the metal quantities received of finished product is also higher, and economic benefit is obvious.The restriction of S, P content is can not cause that molten steel sulphur, phosphorus content raise, and then influence steel quality in order to guarantee after carbon containing iron content agglomerate adds converter.
Gradual deoxidizing reaction according to ferriferous oxide can be calculated needed theoretical carbon amount C
Reason(promptly introducing, in theory the carbon amount that the ferriferous oxide in the carbon containing iron content agglomerate can be restored) by the carbon containing dry ash, calculate according to following reaction:
3Fe
2O
3+C＝2Fe
3O
4+CO (1)
Fe
3O
4+C＝3FeO+CO (2)
FeO+C＝Fe+CO (3)
Carbon in the carbon containing iron content agglomerate is regulated by the amount of allocating into of carbon containing dry ash.
Carbon content in the carbon containing iron content agglomerate need reach certain coefficient of excess K
c, be meant carbon content C in the actual carbon containing iron content compound
RealWith the theoretical carbon amount C that needs of ferriferous oxide reduction reaction
ReasonRatio, i.e. C
Real/ C
ReasonIf coefficient of excess K
cCross the low needs that then can not satisfy the ferriferous oxide autoreduction; Coefficient of excess K
cExcessive, the a series of problems that cause in the time of will causing carbon content to increase occur, as the excessive foamy slag of easy formation, run slag, the slag phenomenon of overflowing is serious, influence converter smelting operation, and because carbon is introduced by the carbon containing dry ash, the increase of carbon content must cause S, P content to raise, TFe content descends, and economic benefit reduces.
The ingredients principle of raw material is: serving as the skeleton of carbon containing iron content agglomerate by iron scale, is the necessary raw material that forms agglomerate and proof strength; Containing certain carbon in the carbon containing dry ash, is the prerequisite that realizes the reaction of carbon containing iron content agglomerate high-level efficiency autoreduction; The dried waste material of other iron content mainly plays the filling effect of fines, and guarantees that carbon containing iron content agglomerate has sufficiently high TFe content.
When experiment showed, above-mentioned carbon containing iron content agglomerate as rotary furnace cooling agent, carbon content is best results in 5%～25% scope.
(2) batch mixing briquetting piece: elder generation sends into iron scale, carbon containing dry ash, the dried waste material of iron content the mixing machine mixing and allocates binding agent into and mixes, and making the carbon content in the mixing material is 5%～25%, TFe 〉=50%, S≤0.50%, P≤0.50%.The mixing material is sent in the mixing pan again, sends into the pair roller ball press then, and the group's of pressure pressure is set at 〉=50KN, compound is pressed into agglomerate, it is that the sieve apparatus of 15mm screens that the agglomerate that extrudes is sent into the aperture, the qualified agglomerate of screening is sent in the stoving oven dried, and can obtain the finished product agglomerate.Sieving following＜agglomerate of 15mm returns mixing pan and utilizes.
Described binding agent is cold fixed binding agent commonly used, can be sodium silicate aqueous solution or potassium silicate aqueous solution, also can be that other can make agglomerate of the present invention reach 2m dropping strength 〉=5 time, the binding agent of mean compressive strength 〉=1500N.Wherein sodium silicate aqueous solution or potassium silicate aqueous solution add-on are 4%～15% of mixing material weight percent.
Carbon containing iron content agglomerate finished product size range is 15mm～70mm, and wherein granularity is not more than 5% by weight less than the fine powder of 15mm.
The present invention compared with prior art has following beneficial effect:
The present invention utilizes the carbon containing iron content waste that is produced in the existing steel manufacture process, and raw material need not dried, and directly is pressed into agglomerate by the pair roller ball press behind the adding additives mixing, gets product after the oven dry, can replace the required ordinary scrap steel of converter smelting.The product work flow is short, all uses the waste material that produces in the Iron and Steel Production, and cost is low, using method is flexible, but add-on is big, the recovery rate of iron height, it is effective to change slag, reach 8～16 ℃ temperature drop simultaneously, near the cooling performance of steel scrap, less to the execute-in-place influence, not only reduced furnace refractory consumption, and having reduced the waste discharge amount, economic benefit and environmental benefit are obvious, have good value for applications.
Embodiment
Converter steelmaking refrigerant of the present invention, its physical and chemical performance technological standard sees Table 1.
Table 1 carbon containing iron content agglomerate physical and chemical performance technological standard
Embodiment 1
Carbon containing iron content agglomerate is a raw material with Steel Plant's waste iron scale, gas ash and iron oxide red, and material composition sees Table 2.
The material composition of table 2 carbon containing iron content agglomerate
The proportion scheme of carbon containing iron content agglomerate sees Table 3.
Table 3 carbon containing iron content agglomerate proportion scheme
Manufacture method: earlier with iron scale, gas ash and iron oxide red are sent into mixing machine mixing 5min, and the adding modulus is 4, weight percent is 6% sodium silicate aqueous solution stirring 5min, the mixing material is sent into mixed grind 5min in the mixing pan again, send into the pair roller ball press then, the group's of pressure pressure is set at 60KN, compound is pressed into agglomerate, it is that the sieve apparatus of 15mm screens that the agglomerate that extrudes is sent into the aperture, the qualified agglomerate of screening is sent in the chain mat machine stoving oven (or screen machine stoving oven), and the agglomerate bake out temperature in the stoving oven is 150 ℃, drying time is that 180min can obtain the finished product agglomerate.Sieving following＜agglomerate of 15mm returns mixing pan and utilizes.
Carbon containing iron content agglomerate finished product size range is about 15mm～70mm, and wherein granularity is about 3.5% by weight less than the fine powder of 15mm.Carbon containing iron content agglomerate finished product water content is 1.1%.
The intensity of finished product carbon containing iron content agglomerate is about 7 times of 2m dropping strength, ultimate compression strength average out to 1850N.Dropping strength and ultimate compression strength satisfy the requirement of steel-making high hopper to the converter feed fully.
Embodiment 2
Carbon containing iron content agglomerate is a raw material with Steel Plant's waste iron scale, charred ashes (being coke ore deposit groove ash) and converter dust-removing ash (being converter gas dry method dust ash), and material composition sees Table 4.
The material composition of table 4 carbon containing iron content agglomerate
The proportion scheme of carbon containing iron content agglomerate sees Table 5.
Table 5 carbon containing iron content agglomerate proportion scheme
Manufacture method: earlier with iron scale, charred ashes and converter dust-removing ash are sent into mixing machine mixing 5min, and the adding modulus is 4, weight percent is 4% sodium silicate aqueous solution stirring 5min, the mixing material is sent into mixed grind 5min in the mixing pan again, send into the pair roller ball press then, the group's of pressure pressure is set at 70KN, compound is pressed into agglomerate, it is that the sieve apparatus of 15mm screens that the agglomerate that extrudes is sent into the aperture, the qualified agglomerate of screening is sent in the chain mat machine stoving oven (or screen machine stoving oven), and the agglomerate bake out temperature in the stoving oven is 200 ℃, drying time is that 150min can obtain the finished product agglomerate.Sieving following＜agglomerate of 15mm returns mixing pan and utilizes.
Carbon containing iron content agglomerate finished product size range is about 15mm～70mm, and wherein granularity is about 2.3% by weight less than the fine powder of 15mm.Carbon containing iron content agglomerate finished product water content is 0.9%.
The intensity of finished product carbon containing iron content agglomerate is about 6 times of 2m dropping strength, ultimate compression strength average out to 1810N.Dropping strength and ultimate compression strength satisfy the requirement of steel-making high hopper to the converter feed fully.
Embodiment 3
Carbon containing iron content agglomerate is a raw material with Steel Plant's waste iron scale, gas ash, charred ashes and final dusting ash, and material composition sees Table 6.
The material composition of table 6 carbon containing iron content agglomerate
The proportion scheme of carbon containing iron content agglomerate sees Table 7.
Table 7 carbon containing iron content agglomerate proportion scheme
Manufacture method: earlier with iron scale, gas ash, charred ashes and final dusting ash are sent into mixing machine mixing 7min, and the adding modulus is 2, weight percent is 6% potassium silicate aqueous solution stirring 5min, the mixing material is sent into mixed grind 5min in the mixing pan again, send into the pair roller ball press then, the group's of pressure pressure is set at 60KN, compound is pressed into agglomerate, it is that the sieve apparatus of 15mm screens that the agglomerate that extrudes is sent into the aperture, the qualified agglomerate of screening is sent in the chain mat machine stoving oven (or screen machine stoving oven), and the agglomerate bake out temperature in the stoving oven is 180 ℃, drying time is that 160min can obtain the finished product agglomerate.Sieving following＜agglomerate of 15mm returns mixing pan and utilizes.
Carbon containing iron content agglomerate finished product size range is about 15mm～70mm, and wherein granularity is about 2.1% by weight less than the fine powder of 15mm.Carbon containing iron content agglomerate finished product water content is 0.8%.
The intensity of finished product carbon containing iron content agglomerate is about 6 times of 2m dropping strength, ultimate compression strength average out to 1780N.Dropping strength and ultimate compression strength satisfy the requirement of steel-making high hopper to the converter feed fully.
Embodiment 4
Carbon containing iron content agglomerate is a raw material with Steel Plant's waste iron scale, blast-furnace dust and converter dust-removing ash, and material composition sees Table 8.
The material composition of table 8 carbon containing iron content agglomerate
The proportion scheme proportioning of carbon containing iron content agglomerate sees Table 9.
Table 9 carbon containing iron content agglomerate proportion scheme
Manufacture method: earlier with iron scale, blast-furnace dust and converter dust-removing ash are sent into mixing machine mixing 7min, and the adding modulus is 3, weight percent is 7% sodium silicate aqueous solution stirring 5min, the mixing material is sent into 5min in the mixing pan again, send into the pair roller ball press then, the group's of pressure pressure is set at 70KN, compound is pressed into agglomerate, it is that the sieve apparatus of 15mm screens that the agglomerate that extrudes is sent into the aperture, the qualified agglomerate of screening is sent in the chain mat machine stoving oven (or screen machine stoving oven), and the agglomerate bake out temperature in the stoving oven is 250 ℃, drying time is that 110min can obtain the finished product agglomerate.Sieving following＜agglomerate of 15mm returns mixing pan and utilizes.
Carbon containing iron content agglomerate finished product size range is about 15mm～70mm, and wherein granularity is about 2.7% by weight less than the fine powder of 15mm.Carbon containing iron content agglomerate finished product water content is 0.5%.
The intensity of finished product carbon containing iron content agglomerate is about 7 times of 2m dropping strength, ultimate compression strength average out to 1840N.Dropping strength and ultimate compression strength satisfy the requirement of steel-making high hopper to the converter feed.
Embodiment 5
Carbon containing iron content agglomerate is a raw material with Steel Plant's waste iron scale, converter dust-removing ash and blast furnace dust, and material composition sees Table 10.
The material composition of table 10 carbon containing iron content agglomerate
The proportion scheme proportioning of carbon containing iron content agglomerate sees Table 11.
Table 11 carbon containing iron content agglomerate proportion scheme
Manufacture method: earlier with iron scale, converter dust-removing ash and gas ash are sent into mixing machine mixing 7min, and the adding modulus is 3, weight percent is 12% sodium silicate aqueous solution stirring 5min, the mixing material is sent into 5min in the mixing pan again, send into the pair roller ball press then, the group's of pressure pressure is set at 70KN, compound is pressed into agglomerate, it is that the sieve apparatus of 15mm screens that the agglomerate that extrudes is sent into the aperture, the qualified agglomerate of screening is sent in the chain mat machine stoving oven (or screen machine stoving oven), and the agglomerate bake out temperature in the stoving oven is 230 ℃, drying time is that 120min can obtain the finished product agglomerate.Sieving following＜agglomerate of 15mm returns mixing pan and utilizes.
Carbon containing iron content agglomerate finished product size range is about 15mm～70mm, and wherein granularity is about 1.2% by weight less than the fine powder of 15mm.Carbon containing iron content agglomerate finished product water content is 0.4%.
The intensity of finished product carbon containing iron content agglomerate is about 11 times of 2m dropping strength, ultimate compression strength average out to 2070N.Dropping strength and ultimate compression strength satisfy the requirement of steel-making high hopper to the converter feed.
Embodiment 6
Carbon containing iron content agglomerate is a raw material with Steel Plant's waste iron scale, charred ashes and converter dust-removing ash, and material composition sees Table 12.
The material composition of table 12 carbon containing iron content agglomerate
The proportion scheme proportioning of carbon containing iron content agglomerate sees Table 13.
Table 13 carbon containing iron content agglomerate proportion scheme
Manufacture method: earlier with iron scale, charred ashes and converter dust-removing ash are sent into mixing machine mixing 7min, and the adding modulus is 3, weight percent is 11% sodium silicate aqueous solution stirring 5min, the mixing material is sent into 5min in the mixing pan again, send into the pair roller ball press then, the group's of pressure pressure is set at 70KN, compound is pressed into agglomerate, it is that the sieve apparatus of 15mm screens that the agglomerate that extrudes is sent into the aperture, the qualified agglomerate of screening is sent in the chain mat machine stoving oven (or screen machine stoving oven), and the agglomerate bake out temperature in the stoving oven is 200 ℃, drying time is that 140min can obtain the finished product agglomerate.Sieving following＜agglomerate of 15mm returns mixing pan and utilizes.
Carbon containing iron content agglomerate finished product size range is about 15mm～70mm, and wherein granularity is about 1.1% by weight less than the fine powder of 15mm.Carbon containing iron content agglomerate finished product water content is 0.2%.
The intensity of finished product carbon containing iron content agglomerate is about 10 times of 2m dropping strength, ultimate compression strength average out to 1990N.Dropping strength and ultimate compression strength satisfy the requirement of steel-making high hopper to the converter feed.
Claims (5)
1. rotary furnace cooling agent, it is characterized in that it be a kind of be that raw material adds the carbon containing iron content agglomerate that binder making becomes with iron scale, carbon containing dry ash, the dried waste material of iron content, the agglomerate finished product satisfies carbon coefficient of excess K
cBe 0.7～1.8, the weight percent of its main chemical compositions meets the following conditions: carbon content is 5%～25%, TFe 〉=50%, S≤0.50%, P≤0.50%; Described carbon containing dry ash is one or more the mixture in gas ash, blast-furnace dust, the charred ashes; The dried waste material of described iron content is one or more the mixture in iron oxide red, converter dust-removing ash, the final dusting ash; The intensity of described carbon containing iron content agglomerate is 2m dropping strength 〉=5 time, mean compressive strength 〉=1500N, finished product water content≤1.5%.
2. rotary furnace cooling agent according to claim 1 is characterized in that it is 2～4 sodium silicate aqueous solution or potassium silicate aqueous solution that binding agent is selected modulus for use.
3. rotary furnace cooling agent according to claim 1, the finished product size range that it is characterized in that carbon containing iron content agglomerate is 15mm～70mm, wherein granularity is not more than 5% by weight less than the fine powder of 15mm.
4. manufacture method that is used for any described rotary furnace cooling agent of claim 1～3, it is characterized in that earlier iron scale, the carbon containing dry ash, the dried waste material of iron content is sent into the mixing machine mixing and is allocated binding agent into and mixes, the mixing material is sent in the mixing pan again, send into the pair roller ball press then, the pair roller ball press is pressed the pressure 〉=50KN of group, compound is pressed into agglomerate, the agglomerate that extrudes screens through sieve apparatus, qualified agglomerate is sent in the stoving oven and is dried, bake out temperature is 110～300 ℃, drying time is 60～240min, can obtain the finished product agglomerate, the following agglomerate of sieve returns mixing pan and utilizes.
5. the manufacture method of rotary furnace cooling agent according to claim 4 is characterized in that:
(1) the binding agent add-on is 4%～15% of a mixing material weight percent;
(2) sieve apparatus sieve aperture aperture is 15mm;
(3) stoving oven is selected chain mat machine stoving oven or screen machine stoving oven for use.
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| CN103509939A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Self-reducing cold-bonded pellet |
| CN106148711B (en) * | 2015-04-19 | 2020-05-05 | 王虎 | Simple and efficient treatment process for metallurgical dust and mud |
| CN108396110B (en) * | 2017-02-05 | 2019-10-29 | 鞍钢股份有限公司 | It is a kind of that mud is sunk as the converter slagging agent and preparation method of raw material using whirling well |
| CN110016551A (en) * | 2019-05-06 | 2019-07-16 | 中冶华天工程技术有限公司 | Cold rolling sludge converter resource utilization method |
| CN112981095B (en) * | 2021-02-08 | 2023-01-31 | 山西太钢不锈钢股份有限公司 | Iron scale ball pressing process |
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