CN1069771A - Utilize sulfate slag to produce the new technology of iron-smelting raw material - Google Patents
Utilize sulfate slag to produce the new technology of iron-smelting raw material Download PDFInfo
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- CN1069771A CN1069771A CN 92108251 CN92108251A CN1069771A CN 1069771 A CN1069771 A CN 1069771A CN 92108251 CN92108251 CN 92108251 CN 92108251 A CN92108251 A CN 92108251A CN 1069771 A CN1069771 A CN 1069771A
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Abstract
The invention discloses a kind of new technology that adopts sulfate slag production iron-smelting raw material burnt in a heap, include that sulfate slag is selected, technical process such as batching, mixing, burnt in a heap, broken, screening, and with sulfuric acid sludge selecting and coke powder, limestone powder in 100: 11～13: 10～15 ratio batching, add 20～30% water of gross weight simultaneously, stir.It is burnt in a heap in the stove that compound is packed into, and in process burnt in a heap blowing-in and combustion-supporting, at last with the agglomerate fragmentation, sieve product.This technology is produced does not need to build chimney stack, no exhaust emission, and the TFe of its product is of high grade, and s content is low, can satisfy the blast furnace ironmaking requirement.
Description
The present invention relates to a kind of waste sulfate slag that sulfurous iron ore is produced behind the sulfuric acid and develop and utilize, perhaps is the preparation method of iron-smelting raw material.
Number of patent application is that 91103039.5 application documents disclose a kind of " Aurosulfo ore waste slag sintering treatment method and agglomerate thereof ", it is to add an amount of coke (C content 78%) and a little additive in waste residue of sulfuric acid, mix suitable quantity of water again and evenly stir, enter high wet combustion then.When generating agglomerate, and constantly replenish O
2, produce So
2.Co
2Deng waste gas, be discharged into high-altitude (45 meters).Agglomerate is as iron-smelting raw material, and its Chemical Composition is: T-Fe content 54%, FeO content 14%, SiO
2Content 13%, Ca content 6.4%, Mgo content 8%, Al
2O
3Content 4.0%, S content 0.4%, p content 0.025%, Mno content 0.40%
Aforesaid method will produce a large amount of SO
2, CO
2Arrive in the air serious environment pollution Deng exhaust gas emission; And to build 45 meters high chimneys, production and cost of investment are bigger; Simultaneously, this method institute agglomerating agglomerate, its T-Fe content are that 54% grade is not high, and the content of S 0.4% does not reach the requirement (GB requires to contain S≤0.3% into Lu Kuang) of blast furnace ironmaking.
The objective of the invention is to design a kind of new technology of utilizing sulfate slag to produce iron-smelting raw material, of high grade with the TFe that this technology is produced, sulphur content is low, and environmental pollution is little in process of production, and production technique is simple.
The object of the present invention is achieved like this: it includes batching, and technical process such as batch mixing, burnt in a heap, fragmentation and screening are before batching, at first carry out selected to sulfate slag, make its TFe content bring up to 55～60%, S drops to 0.15%～0.30%, and As drops to≤and 0.05%.The selected sulfate slag that comes out is mixed with addition of limestone powder and coke powder, its proportioning is: sulfuric acid sludge selecting: coke powder: limestone powder=100: (11～13): (10-15) again.Coke powder carbon content 〉=80%, granularity=1～5mm.Limestone powder CaO 〉=52%.
Granularity: 1～6mm.20～30% the water of adding total amount in compound stirs, and carried out in stove then 1～2 hour burnt in a heap, and it is combustion-supporting to carry out air blast in burnt in a heap.Being 5～40mm with agglomerate Mechanical Crushing to lumpiness after sintering finishes, sieving, is product on the sieve, sieve down＜powder of 5mm is as returns.
Below in conjunction with drawings and Examples, technical process of the present invention is described in detail.
Accompanying drawing is process flow sheet of the present invention.
Referring to accompanying drawing, technical process of the present invention mainly comprises following step:
The first step: sulfuric acid sludge selecting.
The sulfate slag method for concentrating has, methods such as selection by winnowing, wet concentration and magnetic separation.Wherein magnetic separation is divided into high intensity magnetic separation and low intensity magnetic separation again, the present invention is according to the ore deposit phase composite of sulphur slag and the characteristics of Chemical Composition, through test of many times, determined the employing weak magnetic separation process, sulfate slag can be with its TFe by 35～40% through after the low intensity magnetic separation, bring up to 55～60%, S is by 1.0～2.0%, drop to 0.15～0.30%＜5%AS by 0.1～2.0 reduce to≤0.05% like this can with the sulfate slag of chemical plant emission through after, its S content has been lower than the requirement (GB requires to contain S≤0.3% into Lu Kuang) of blast furnace ironmaking.So descending operation: can not adopt the S measure of taking off in the local method sinter process, so there is not SO in process of production
2Gas enters atmosphere, and environmental problem is well solved.
Second step: batching
With selected sulfate slag, limestone powder is in the same place by 100: 10～15: 11～13 mixed with coke powder, and the water stirring and evenly mixing of adding into total amount 20-30% becomes compound.And compound is with can be agglomerating in hand, loses and can loose into granule on the ground for well.Wherein, coke powder can be with nut coke through the roll crusher fragmentation, and carbon content is 〉=80%, and granularity is 1-5mm, limestone powder CaO
〉=52%, granularity 1～6mm.
The 3rd step: burnt in a heap
With sulfuric acid sludge selecting and coke powder and limestone powder and add water and be mixed in proportion and be transported to that stove is other prepares charging, the igniting material of shop fixtures is the about 8～10kg of straw, every stove bed coke (bituminous coal or nut coke) consumption is 10～15kg, every kiln compound Intake Quantity 3.0-3.5 ton, Intake Quantity is too much unsuitable, otherwise can influence sintering quality.Sintered material adds in batches: after adding bed coke, add first compound 0.3～0.5t, the stove top layer is paved with, and the shop is even, begins igniting, should light evenly on fire all around.
When burn with anger in the first batch of material surface, add compound gradually, up to adding.In sintering process, stove is carried out air blast, and air blast takes ascendingly, to guarantee igniting evenly, bed coke fully burns, and makes the on fire also even of sinter bed.Air blast got final product blowing-out in 1.5～2 hours again when compound adds, outage.
The 4th step: product treatment
After sintering finishes, product transported to stack the place, adopt Mechanical Crushing, lumpiness is 5-40mm, screening then, sieve down＜the pulverizing end of 5mm is as returns, returns to the compound sintering once more, is finished product on the sieve.
The present invention compared with prior art, its outstanding effect is: adopt the low intensity magnetic separation sulfate slag to carry out its product main chemical of local method baked for producing iron-smelting raw material to be: TFe=55～60%, R=＜CaO/SiO2=1～1.5.As≤0.05%, other physical and chemical indexs all can satisfy the requirement of blast furnace ironmaking, have greatly alleviated to contain S gas to the pollution of atmosphere, and production technology is simple, need not build tall and big chimney.
Claims (3)
1, a kind of new technology of utilizing sulfate slag to produce iron-smelting raw material, include batching, mix, burnt in a heap, broken, the sieving technology flow process, it is characterized in that before batching, carrying out sulfate slag selected earlier, make its TFe content bring up to 55～60%, S content drops to 0.15%～0.30%, As drops to≤and 0.05%, the raw material and the proportioning of batching are: sulfuric acid sludge selecting: coke powder: limestone powder=100: 11～13: 10～15, in batching, add simultaneously 20～30% water mixing and stirring of gross weight, in stove, carry out burnt in a heap then, and ascending in process burnt in a heap to carry out air blast combustion-supporting, at last agglomerate is pulverized, screening, be finished product on the sieve, the powder that sieves following＜5mm turns back to capable again sintering in the compound.
2,, it is characterized in that sulfuric acid sludge selecting adopts weak magnetic beneficiation technology according to the said new technology of utilizing sulfate slag to produce iron-smelting raw material of claim 1.
3, according to the said new technology of utilizing sulfate slag to produce iron-smelting raw material of claim 1, limestone powder CaO content 〉=52% in it is characterized in that preparing burden, granularity 1～6mm, coke powder are through roll crusher with nut coke, being broken into granularity is 1～5mm, carbon content 〉=80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108251 CN1069771A (en) | 1992-08-17 | 1992-08-17 | Utilize sulfate slag to produce the new technology of iron-smelting raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108251 CN1069771A (en) | 1992-08-17 | 1992-08-17 | Utilize sulfate slag to produce the new technology of iron-smelting raw material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1069771A true CN1069771A (en) | 1993-03-10 |
Family
ID=4943370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92108251 Pending CN1069771A (en) | 1992-08-17 | 1992-08-17 | Utilize sulfate slag to produce the new technology of iron-smelting raw material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1069771A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371470C (en) * | 2005-09-01 | 2008-02-27 | 中南大学 | Method of producing high grade magnetic concentrate from sulfuric-acid residue composite pellet |
| CN102822317A (en) * | 2010-03-19 | 2012-12-12 | 新日本制铁株式会社 | Process for production of solid fuel for use in sintering, solid fuel for use in sintering, and process for manufacturing sintered ore using same |
-
1992
- 1992-08-17 CN CN 92108251 patent/CN1069771A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371470C (en) * | 2005-09-01 | 2008-02-27 | 中南大学 | Method of producing high grade magnetic concentrate from sulfuric-acid residue composite pellet |
| CN102822317A (en) * | 2010-03-19 | 2012-12-12 | 新日本制铁株式会社 | Process for production of solid fuel for use in sintering, solid fuel for use in sintering, and process for manufacturing sintered ore using same |
| CN102822317B (en) * | 2010-03-19 | 2014-08-27 | 新日铁住金株式会社 | Process for production of solid fuel for use in sintering, solid fuel for use in sintering, and process for manufacturing sintered ore using same |
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