CN104846193A - Method for pressing steel slag into furnace charge of blast furnace - Google Patents
Method for pressing steel slag into furnace charge of blast furnace Download PDFInfo
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- CN104846193A CN104846193A CN201510178812.XA CN201510178812A CN104846193A CN 104846193 A CN104846193 A CN 104846193A CN 201510178812 A CN201510178812 A CN 201510178812A CN 104846193 A CN104846193 A CN 104846193A
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Abstract
The invention relates to a method for pressing steel slag into a furnace charge of a blast furnace. The method comprises the steps: taking the steel slag as a main raw material, according to 100% by mass of the steel slag, adding 2-4% of bentonite, 0.2-0.4% of sodium carboxymethyl cellulose, 6-8% of water and 1-3% of pulverized coal, mixing evenly, then loading into a mold, carrying out pressing molding by a press machine, naturally curing for 8-10 d, and thus obtaining a high-mechanical-strength block ore as the furnace charge of the blast furnace to charging into the furnace for smelting. The method has the advantages of wide application range, simple technological process, low processing cost, and low productive investment, besides, improves the application value of the steel slag, and enables the steel slag resource to be fully utilized.
Description
Technical field
The invention belongs to slag comprehensive utilization technical field, particularly a kind of method slag being pressed into blast furnace burden.
Background technology
Slag is the solid waste that iron and steel enterprise produces when producing steel products, and the output of slag is very big, is about 15 ~ 20% of crude steel output, containing higher iron level in these slags, is a kind of very valuable secondary resource.Make full use of slag, the problem of iron ore deposit anxiety can not only be alleviated, its wasting of resources brought, problem of environmental pollution can also be solved, reduce enterprise's production cost.
At present, the main method of iron and steel enterprise's internal recovering process slag is allocated in sintering and pelletizing iron-bearing material.But directly allocate in raw materials for sintering there will be that sintering utilization coefficient reduces, degradation problem under high, the sinter quality of energy consumption.Several pelletizing method also has Production Flow Chart complicated, and cost is high, invest large problem.Briquetting process has that technical process is simple, processing charges is low and the advantage such as investment of production province, is the very potential production method of one.But in current briquetting process, in order to improve lump ore physical strength, ensure that it can not be pulverized when entering stove and enter stove upset extruding, mostly can allocate the wilkinite of higher proportion into, general bentonite ore ratio is 10%; But containing a large amount of impurity in wilkinite, not only reduce lump ore Iron grade, also increase and smelt the quantity of slag, severe exacerbation blast-furnace smelting.
Summary of the invention
The object of the invention is to ensure that institute briquette reduces bentonite ore ratio while meeting dropping strength, provide that a kind of bentonite ore ratio is lower, lump ore intensity is high and a kind of method slag being pressed into blast furnace burden that metallurgical effect is good for this reason.
For achieving the above object, the technical solution used in the present invention is: take slag as raw material, by the weight ratio of raw material add 2 ~ 4% wilkinite, the Xylo-Mucine of 0.2 ~ 0.4%, the water of 6 ~ 8% and 1 ~ 3% coal dust, mould is loaded after stirring, utilize pressing machine compression moulding, obtain the high lump ore of physical strength after 8 days through natural curing, directly enter stove as blast furnace burden and smelt.
Described slag granularity consists of ﹣ 0.074mm and accounts for 84 ~ 89%, and wilkinite size composition is that ﹣ 0.074mm accounts for 98 ~ 100%, and coal powder size consists of ﹣ 0.074mm and accounts for 88 ~ 95%.
The equipment of described extrusion forming is pressing machine, and forming pressure is 30.6 ~ 51.0MPa.
The invention has the beneficial effects as follows: 1, this is main raw material with slag, with addition of certain binding agent and coal dust, compression moulding directly enters blast-furnace smelting after natural curing, method is applied widely, bentonite consumption is low, lump ore intensity is high, and improve the using value of slag, steel slag resource is fully used.
2, the binding agent adopted is that wilkinite is with addition of Xylo-Mucine, not only bond effect is good, simultaneously compared with single use wilkinite, considerably reduce bentonitic consumption, avoid the Iron grade reduction and the deterioration to blast-furnace smelting that cause because of bentonitic excessive adding.
3, take pressing machine as molding device, not only production technique is simple and convenient, and obtained lump ore shape can change with the change of mould, meets various demand.
4, present method adds coal dust in the feed, can effectively promote that furnace reduction is reacted after lump ore enters blast-furnace smelting, and reinforcing blast furnace is smelted, and is conducive to producing.
Present method has applied widely, that technical process is simple, processing charges is low, investment of production is economized advantage, improves the using value of slag simultaneously, steel slag resource is fully used.
Accompanying drawing explanation
Fig. 1 is the production technological process of present method.
Embodiment
Below in conjunction with embodiment, the invention will be further described, the restriction not to its protection domain.
Following examples slag is bessemer furnace slag; Wilkinite character is: water-intake rate 37.33%, Absorbance ratio-derivative method 457.5%, rate of expansion 18%, colloid index 102%; Coal dust is popular smokeless coal, and composition is: C 78.38%, Ad 12.50%, Vd 8.31%, Md 0.81%.
In order to meet intensity, can not pulverize when ensureing that lump ore enters stove and enters stove upset extruding, requiring that institute's briquette falls from 2m eminence after natural curing can not be cracked, and therefore, in following examples, the leading indicator weighing lump ore quality is its dropping strength.
When surveying dropping strength, get 20 lump ores, drop on steel plate in 2m eminence, until lump ore is cracked, write down the number of times fallen separately respectively, getting its mean value is dropping strength.According to the requirement entering stove, dropping strength is at least 3.0 times/2m.
The object of following examples is when reducing bentonite ore ratio as far as possible, and the physical strength of the lump ore that makes to cold pressing reaches requirement.
Following examples obtain on the basis of test.
Present method has carried out former briquetting technique in advance, test when bentonite ore ratio is 10%, then while meeting dropping strength, reduces bentonite ore ratio at guarantee institute briquette.
The factor affecting lump ore physical strength of colding pressing mainly contains forming pressure, bentonite ore ratio, mixture moisture etc.
In former briquetting method, bentonite ore ratio is 10%, and therefore, keep bentonite ore ratio 10% constant, water dispenser ratio is 8%, carries out the test of different pressures condition lower lock block.
Testing data is in table 1.
Table 1 pressure size is on the impact of dropping strength
From table 1 experimental result, when pressing pressure is 10.2 MPa, dropping strength is only 1.2 times/2m, but when pressure brings up to 40.8 MPa, dropping strength brings up to 4.7 times/2m, but when pressure continues to improve, dropping strength but has decline to a certain degree.This is due to the increase along with pressure, air between feed particles is extruded eliminating gradually, and the distance between nodulizing endoparticle reduces, and intergranular contact conditions improves, intergranular cohesive action strengthens, so dropping strength improves, but intermolecular the born pressure of material also has certain limit, when pressure exceedes this limit, material is intermolecular just there will be slippage, cause material by conquassation, so when pressure continues to improve, dropping strength can decrease to some degree.
When briquetting pressure is 30.6 MPa, dropping strength is 3.8 times/2m, now namely meets requirement of strength, and has both caused energy consumption waste also easily to cause equipment attrition when pressure is higher, and therefore briquetting pressure is decided to be 30.6 MPa.
On this basis, reduce bentonite consumption, be under the condition of 30.6 MPa at briquetting pressure, different bentonite ore ratio on the impact of dropping strength, in table 2.
Table 2 bentonite ore ratio is on the impact of dropping strength
From table 2 test-results, when reducing bentonite consumption gradually, dropping strength can reduce gradually.This is because wilkinite plays a part high dispersive binding agent, can improve intergranular cohesive force and internal friction, when bentonite ore ratio reduces, an interparticle bonding is inadequate, and dropping strength will reduce.
When bentonite consumption is 8%, dropping strength is just 3.1 times/2m, and when consumption is 6% and 4%, dropping strength is respectively 2.7 times/2m and 2.2/2m.
When bentonite ore ratio is 8%, lump ore dropping strength can reach 3.1 times/2m, but proportioning is still higher, continues to attempt reducing bentonite ore ratio.Design adds wetting ability organic fibre in briquetting compound, plays the Framework Of Steel Reinforcement effect in Steel Concrete of being similar to and role of network in lump ore.There is absorption by the planar water on its network surface and mineral powder granular mineral powder granular is firmly attached together, the reactive force between mineral powder granular is strengthened.In table 3.
Table 3 organic fibre consumption is on the impact of dropping strength
As seen from the experiment, add the dropping strength that organic cellulose can improve lump ore really, when bentonite ore ratio is 4%, when organic fibre addition reaches 0.3%, average dropping strength just in time reaches 3.0 times/2m.
Organic fibre has two kinds of forms, and one is staple fibre, and another kind is macrofiber, because Mierocrystalline cellulose is very carefully difficult to dispersed in compound opening, and along with consumption increase more and more difficulty scatter, compound is difficult to mix.Therefore the suitable usage of organic fibre is for adding staple fibre 0.3%.
The moisture of compound has important effect to compression moulding process.Suitable moisture can reduce the friction resistance between briquetting raw material and die wall, raw material between particle and particle, tightly packed under pressure, makes lump ore have good intensity.At forming pressure 30.6 MPa, during bentonite ore ratio 4%, during organic fibre addition 0.3%, the test-results of mixture moisture is in table 4.
Table 4 mixture moisture is on the impact of lump ore dropping strength
As seen from the experiment, when moisture is increased to the process of 6% from 4%, lump ore dropping strength brings up to 3.4 times/2m by 2.9 times/2m, this is due to the increase along with moisture, during compression moulding, between mixture particle, water fullness rate increases, reduce intergranular friction resistance, between particle, cohesive force strengthens, so dropping strength is carried.But when moisture increases further, dropping strength but can reduce.And find in pressing process, after moisture is more than 6%, during compression moulding, a small amount of water can be born in lump ore surface.Therefore determine, during compacting, adequate moisture is 6%.
Allocate a certain amount of coal dust into and can more effectively promote that furnace reduction is reacted, be conducive to producing, coal blending powder under the condition therefore met the demands in intensity.
The impact of table 5 coal dust addition and lump ore dropping strength
From testing data, when coal dust content is 3%, the dropping strength of lump ore has the raising of minute quantity, because every part of fineness ratio is thinner than slag granularity, when suppressing, pulverized coal particle is filled between steel slag particle, play certain lubrication, improve the plasticity of lump ore.But when continuing to improve coal dust proportioning, dropping strength sharply declines, and this is because the wetting ability of coal dust is less than slag granularity, after being added beyond certain proportion, can worsen the bonding situation between lump ore particle, reduces dropping strength.
According to above test, most preferred embodiment of the present invention is as follows.
embodiment 1
Slag, wilkinite, Xylo-Mucine, coal dust and water are mixed according to the ratio that massfraction is 100:4:0.2:3:6, then compound is taken, joining diameter is in 50mm model, TYE-200 universal press is made at the pressure of 30.6MPa the lump ore of Ф 50mm × 50mm, through natural curing after 8 days, its dropping strength is 3.5 times/2m, can meet into stove requirement, enters stove smelt as blast furnace burden.
embodiment 2
Slag, wilkinite, Xylo-Mucine, coal dust and water are mixed according to the ratio that massfraction is 100:2:0.4:3:6, then compound is taken, joining diameter is in 50mm model, and TYE-200 universal press is made at the pressure of 30.6MPa the lump ore of Ф 50mm × 50mm.
Comparative example 1, and bentonite consumption declines, the corresponding rising of Xylo-Mucine consumption, and same natural curing is after 8 days, and its dropping strength can reach 3.8 times/2m, can meet into stove requirement, enters stove smelt as blast furnace burden.
Known by embodiment 1-2, present method can on the basis ensureing slag block dropping strength, and maximum amplitude reduces bentonite consumption, improves blast-furnace smelting environment.
embodiment 3
Slag, wilkinite, Xylo-Mucine, coal dust and water are mixed according to the ratio that massfraction is 100:2:0.4:3:6, then compound is taken, joining diameter is in 50mm model, TYE-200 universal press is made at the pressure of 40.8MPa the lump ore of Ф 50mm × 50mm, through natural curing after 8 days, its dropping strength can reach 4.0 times/2m, and intensity can meet into stove requirement, enters stove smelt as blast furnace burden.
Known by embodiment 1-3, under the prerequisite of other condition optimums, suitably increase pressure, slag block dropping strength can be improved.
embodiment 4
Slag, wilkinite, Xylo-Mucine, coal dust and water are mixed according to the ratio that massfraction is 100:2:0.4:3:7, then compound is taken, joining diameter is in 50mm model, TYE-200 universal press is made at the pressure of 40.8MPa the lump ore of Ф 50mm × 50mm, through natural curing after 8 days, its dropping strength can reach 3.8 times/2m, and intensity can meet into stove requirement, enters stove smelt as blast furnace burden.
Known by embodiment 1-4, under the prerequisite of other condition optimums, moisturize, be unfavorable for the enhancing of slag block dropping strength.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (7)
1. slag is pressed into the method for blast furnace burden by one kind, by slag crushing, it is characterized in that: take slag as main raw material, by the mass ratio of slag 100% add 2 ~ 4% wilkinite, the Xylo-Mucine of 0.2 ~ 0.4%, the water of 6 ~ 8% and 1 ~ 3% coal dust, mix rear loading mould, utilize pressing machine compression moulding, obtain the high lump ore of physical strength after 8 ~ 10 days through natural curing, enter stove as blast furnace burden and smelt.
2. method slag being pressed into blast furnace burden according to claim 1, it is characterized in that slag granularity consists of ﹣ 0.074mm and accounts for 84 ~ 89%, wilkinite size composition is that ﹣ 0.074mm accounts for 98 ~ 100%, and coal powder size consists of ﹣ 0.074mm and accounts for 88 ~ 95%.
3. method slag being pressed into blast furnace burden according to claim 1, is characterized in that the pressure of pressing machine compression moulding is 30.6 ~ 51.0MPa.
4. method slag being pressed into blast furnace burden according to claim 1-3, slag, wilkinite, Xylo-Mucine, coal dust and water is it is characterized in that to mix according to the ratio that massfraction is 100:4:0.2:3:6, then compound is taken, joining diameter is in 50mm model, pressing machine is made at the pressure of 30.6MPa the lump ore of Ф 50mm × 50mm, through natural curing after 8 days, enter stove as blast furnace burden and smelt.
5. method slag being pressed into blast furnace burden according to claim 1-3, slag, wilkinite, Xylo-Mucine, coal dust and water is it is characterized in that to mix according to the ratio that massfraction is 100:2:0.4:3:6, then compound is taken, joining diameter is in 50mm model, pressing machine is made at the pressure of 30.6MPa the lump ore of Ф 50mm × 50mm, through natural curing after 8 days, enter stove as blast furnace burden and smelt.
6. method slag being pressed into blast furnace burden according to claim 1-3, slag, wilkinite, Xylo-Mucine, coal dust and water is it is characterized in that to mix according to the ratio that massfraction is 100:2:0.4:3:6, then compound is taken, joining diameter is in 50mm model, pressing machine is made at the pressure of 40.8MPa the lump ore of Ф 50mm × 50mm, through natural curing after 8 days, enter stove as blast furnace burden and smelt.
7. method slag being pressed into blast furnace burden according to claim 1-3, slag, wilkinite, Xylo-Mucine, coal dust and water is it is characterized in that to mix according to the ratio that massfraction is 100:2:0.4:3:7, then compound is taken, joining diameter is in 50mm model, pressing machine is made at the pressure of 40.8MPa the lump ore of Ф 50mm × 50mm, through natural curing after 8 days, enter stove as blast furnace burden and smelt.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107586950A (en) * | 2017-09-30 | 2018-01-16 | 四川德胜集团钒钛有限公司 | A kind of production method of the sintering deposit of the slag containing dephosphorization |
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| CN1203954A (en) * | 1998-04-29 | 1999-01-06 | 宝山钢铁(集团)公司 | Production method of direct reduction shaft and blast furnace cold-bonded pellet |
| CN102051473A (en) * | 2010-12-14 | 2011-05-11 | 山东创新腐植酸科技股份有限公司 | Preparation method of non-sintered carbon-bearing iron pellets |
| CN103397178A (en) * | 2013-07-15 | 2013-11-20 | 中南大学 | Molding and agglomerating process of secondary iron-contained mud from iron and steel plant |
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- 2015-04-16 CN CN201510178812.XA patent/CN104846193A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1203954A (en) * | 1998-04-29 | 1999-01-06 | 宝山钢铁(集团)公司 | Production method of direct reduction shaft and blast furnace cold-bonded pellet |
| CN102051473A (en) * | 2010-12-14 | 2011-05-11 | 山东创新腐植酸科技股份有限公司 | Preparation method of non-sintered carbon-bearing iron pellets |
| CN103397178A (en) * | 2013-07-15 | 2013-11-20 | 中南大学 | Molding and agglomerating process of secondary iron-contained mud from iron and steel plant |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107586950A (en) * | 2017-09-30 | 2018-01-16 | 四川德胜集团钒钛有限公司 | A kind of production method of the sintering deposit of the slag containing dephosphorization |
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Application publication date: 20150819 |