CN107779534A - A kind of shaft furnace process processing steel plant are containing zinc, iron dirt bricklayer's's process - Google Patents
A kind of shaft furnace process processing steel plant are containing zinc, iron dirt bricklayer's's process Download PDFInfo
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- CN107779534A CN107779534A CN201710981905.5A CN201710981905A CN107779534A CN 107779534 A CN107779534 A CN 107779534A CN 201710981905 A CN201710981905 A CN 201710981905A CN 107779534 A CN107779534 A CN 107779534A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
- C21B11/02—Making pig-iron other than in blast furnaces in low shaft furnaces or shaft furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
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- Environmental & Geological Engineering (AREA)
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a kind of shaft furnace process processing steel plant containing zinc, iron dirt bricklayer's's process, belong to field of steel metallurgy.It is characterized in that all dirt mud of steel works sintering, blast furnace, converter, electric furnace, steel rolling process are handled by briquetting, it is not sintered, enter stove smelting molten iron directly as shaft furnace raw material.The advantages of technique is integrated with rotary hearth furnace, oxycup shaft furnaces, DK small furnaces each, is improved to oxycup shaft furnace process, the shortcomings that compensate for oxycup shaft furnaces, reduces smelting cost, reduces environmental pollution while add efficiency.The technique can handle all dirt mud of steel works sintering, blast furnace, converter, electric furnace, steel rolling process, and it is molten iron, crude zinc and high heating value gas fully to reclaim valuable element, the primary products such as the iron in dirt mud, carbon, zinc.
Description
Technical field
The present invention relates to one kind processing steel plant containing zinc, iron dirt bricklayer's's skill, more particularly to a kind of shaft furnace process processing steel plant
Containing zinc, iron dirt bricklayer's's skill.
Background technology
Dust of Iron And Steel Works mostlys come from the dust collecting process of each operations such as sintering, pelletizing, blast furnace, converter and rolling, typically
TFe contents are 30~70%, simultaneously containing certain content carbon and valuable element, in traditional blast furnace-converter Steel Production Flow Chart
In, the yield of dust is about the 8~12% of crude steel yield, and quantity is very huge, therefore, recycling is carried out to Dust of Iron And Steel Works
Recycling has very big economic benefit and social benefit.A variety of harmful elements such as the zinc that contains in dirt mud, lead, alkali metal
Its recycling is limited, does not only take up the land resource of preciousness by stacking landfill disposal dirt mud, pollutes environment again, and
Waste mineral resources.Secondary pollution caused by order to avoid selling because of the discharge of dirt mud and outside, many iron and steel enterprises carry out powder reluctantly
Dirt is returned with sintering or pelletizing process to realize that inner loop utilizes, but which results in material quality deterioration, alkali metal, zinc etc. to have
The problems such as enrichment of the evil element in steel flow.
Current dirt sludge treatment technology widely used in the world has tri- kinds of rotary hearth furnace, OxyCup and DK techniques, and this is several
Kind of technique can handle dirt mud to a certain extent, but also perfect part in need.It is once the advantage and disadvantage pair of three kinds of technique
Than：
The rotary hearth furnace of table 1, OxyCup and DK process rations
Rotary hearth furnace major product is metallized pellet, but product sulfur content is higher, and production efficiency Low investment is big and takes up an area
Area is big；OxyCup handicraft products are molten iron, and processing dirt mud scope is wider, but the equipment cycle of operation is short and maintenance load
Greatly；DK technological operations are simple, and application is more ripe, and product is molten iron, but need to sinter, and bring high pollution and high energy consumption.By
In place of three of the above technique Shortcomings.
The content of the invention
It is higher the invention aims to solve conventional rotary hearth furnace major product product sulfur content, production efficiency Low investment it is big and
Floor space is big；OxyCup handicraft products are molten iron, and the equipment cycle of operation is short and maintenance load is big；DK needs to sinter, and brings
The problems such as high pollution and high energy consumption.The shaft furnace process of the present invention is indirect reduction, and product is molten iron.
A kind of shaft furnace processing steel plant containing zinc, iron dirt bricklayer's's process, it is characterized in that by steel works sintering, blast furnace, converter,
Electric furnace, all dirt mud of steel rolling process are handled by briquetting, not sintered, enter stove smelting molten iron directly as shaft furnace raw material, have
Body technology step is as follows：
(1) cloth：Using clock-type cloth, charge composition is：Dirt walk block, coke, flux, ratio are respectively 76%,
23%, 1%.Shaft furnace furnace roof and shaft shaft furnace furnace roof use traditional clock-type cloth, and shaft perforate is as shaft furnace exhanst gas outlet.
(2) air blast：Entering stove air quantity is：1630m3/ t, wind-warm syndrome are 1000~1200 DEG C or so.
(3) coal injection：Injection amount is 30kg/t.
(4) melting：Smelting time 3-5h, smelting temperature are 1100-1250 DEG C.
(5) come out of the stove：Smelting obtains molten iron and slag, and molten iron can be used for pneumatic steelmaking or production cast iron after slag sluicing system,
Slag can also can be directly used for producing non-burning brick, slag wool etc. by Water Quenching into after grain slag as the raw material of production cement.
(6) it is vented：The ash-laden gas come out from shaft furnace, can obtain zinc-rich flue dust, as system after gas dust remover purifies
The raw material of Zn Cr coating.
Further, as shaft furnace exhanst gas outlet, the ratio of furnace roof height and shaft shaft furnace height is 1 for shaft perforate；3,
Shaft furnace ratio of height to diameter is 8：3, shaft perforate is located at shaft 4/5-5/6, blast orifice as shaft furnace exhanst gas outlet, the discharging opening of shaft furnace
At the 15cm -50cm of discharging opening upper end.
Further, the preparation of the dirt mud briquetting is to mix dirt mud and a certain amount of cement bonding agent, coal dust, is passed through
Briquetting is carried out after machine is mixed several times, vibrating punching press by brick machine makes powder pressing into diameter about 70-110mm agglomerate, then passes through
The maintenance for spending 3 days can obtain dirt mud Cold-bonded agglomeration.
Further, the coke powder or coal dust fix carbon content and should be greater than 85%, typically between 85%-90%.
Further, the briquetting all iron content finally given have to be larger than 35%, typically between 35%-40%.
The specific content of the invention of shaft furnace：
(1) shaft furnace furnace roof and shaft
Shaft furnace furnace roof uses traditional clock-type cloth, and shaft perforate is as shaft furnace exhanst gas outlet, due to stock gas trap
Interior hot environment, all zinc and most of alkali metal are discharged with flue gas, and are filtered in follow-up washing system, collected,
Form zinc-rich mud cake；The cold pressing block in furnace roof portion has higher sealing, and therefore, furnace roof only installs a single clock furnace top equipment.
Compared with traditional blast furnace, furnace roof design is simultaneously uncomplicated, and without strict sealing, the flue gas of collection can obtain zinc-rich after processing
Dirt mud.
(2) dirt mud briquetting workshop
Dust Cold bonding briquette is produced compared with DK techniques to replace conventional sintering ore deposit, energy consumption is reduced and reduces pollution.
Table 2 is the chemical constituent of Baosteel different dusts, although different dirt mud chemical compositions are variant, shaft furnace can all unite
One is handled.Table 3 is the main chemical compositions of coke powder, and the fixed carbon content of used coke powder (or coal dust) should be greater than 85%,
Typically between 85%-90%.Dirt mud, coal dust, cement, water are mixed by a certain percentage, wherein dirt mud, coke powder (or coal dust),
Cement, water proportion are respectively 70-80%, 10-12%, 7-9%, 7-9%, and briquetting is carried out after mixing and is freezed off so that dirt mud is made
Knot pressure block.The briquetting all iron content finally given have to be larger than 35%, typically between 35%-40%, a diameter of 70- of briquetting
110mm。
The chemical composition of the different dusts of table 2, wt%
The coke powder chemical composition of table 3, wt%
Briquetting workshop is by raw material workshop, batch plant, transportation system, dust Storage Silo, stirring tower, brick making system and supports
Shield workshop composition briquettings workshop mainly includes following components：
1) raw material workshop (wet feed stockpiling, the accumulating of finished product carbon brick)
2) feed proportioning, transportation system
3) dry powder (dedusting ash) Storage Silo and air-transport system
4) tower and brick making system are stirred (setting mixtures of materials stirs out the mixed material being evenly distributed in advance for reception)
5) powder transportation system (belt feeder, underground vestibule)
6) carbon brick maintenance workshop (carbon brick solidifies 3 day time at curing)
7) finished product carbon brick, coke and additive transportation system (belt feeder, inclination angle belt conveyor, material feeding hole, vestibule and transhipment
Stand)
(3) feed stock for blast furnace composition
Because feed stock for blast furnace Iron grade is relatively low, the quantity of slag is big, although so shaft furnace ratio of putting coke into furnace is relative to ordinary blast
400kg/tHM is high, reaches 600kg/tHM iron, because this technique need not sinter, can save sintering energy consumption about 50kg/tHM.Dirt
Mud 450,000 tons of dirt mud total amount, using cement as binding agent, is compressed to using the dirt mud of each procedure by press ball device
Six prisms of 50-110mm sizes, about 500,000 tons of dirt walk block can be produced, according to dirt walk block basicity, it is necessary to addition of a certain amount of
Silica is added in stove as flux.Shaft furnace product is molten iron and slag, and hot metal composition is similar to the blast-melted composition of tradition, can be straight
Connect and produced for pneumatic steelmaking, the slag quantity of slag is 448.05kg/tHM, and composition is similar to traditional blast-furnace slag, broken through cooling down
It can be used for building materials or manufacture of cement after broken.Shaft furnace material balance table is as shown in table 3.
The shaft furnace material balance table of table 3
(4) shaft furnace coal gas
Although ratio of putting coke into furnace is high relative to ordinary blast, calorific value of gas is very high, calorific value of gas about 7000kJ/m3, coal
Gas CO contents reach 54% or so.Therefore shaft furnace may be used as gas generator use.Shaft furnace gas composition and the calorific value such as He of table 4
Shown in table 5.
The shaft furnace stock gas composition of table 4
5 various calorifics value of gas of table contrast, kJ/m3
(5) tap a blast furnace form
The Metal In Shaft Furnace cycle is short, and usage factor is high, goes out that iron is big in the unit interval, therefore shaft furnace going out using conventional blast furnace
Iron form, it is different from the siphon tapping of OxyCup techniques.
(6) wind-warm syndrome
Vertical furnace wind-warm syndrome is higher, and wind-warm syndrome is up to 1000~1200 DEG C or so, and OxyCup shaft furnace process only has 600 DEG C of left sides
It is right.High wind-warm syndrome can improve yield first；Secondly wind-warm syndrome improves, and hot blast brings the increase of cupola well heat into, while the coke to burn subtracts
Coal resource is reduced less, coke ratio is reduced；The heat that last coal gas up carries is reduced so that temperature of the furnace hearth carries
High, shaft and top temperature reduce.
Fig. 1 be using Fluent simulation air quantity be 1727.91m3Shaft furnace bulk temperature distribution situation during/h, from Fig. 1
As can be seen that the Temperature Distribution of novel melting stove is reasonable, the raceway zone size of formation is suitable, the softening temperature section of dirt walk block
For 1150~1300 DEG C, this section is particularly narrow, forms one layer of very thin cohesive zone.This be beneficial to Gas Flow rising and
The decline of furnace charge so that gas fluid distrbution is more reasonable.
(7) coal injection
As a result of high wind-warm syndrome, therefore can be with coal injection.The metallurgical coke of costliness is instead of with coal, reduces coke ratio,
The cost of blast furnace ironmaking is set to decline to a great extent.Being blown pulverized coal injection simultaneously can be as a kind of means of the adjustment working of a furnace.Secondly blast furnace
Coal powder injection can improve furnace cylinder working state, make blast furnace stable smooth operation.Can also be finally that blast furnace improves wind-warm syndrome and oxygen-enriched air blast wound
Make condition.
The present invention devises a kind of technology prototype of shaft furnace process efficient process dirt mud, has digested and assimilated rotary hearth furnace, OxyCup
The advantages of with DK techniques, and the shortcomings that make up three kinds of technique, novel melting oven process has without sintering process, crude fuel applicability
The advantage such as wide.Primary product is molten iron, crude zinc and coal gas.Molten iron can be directly entered converter smelting, and crude zinc can be reclaimed directly, coal
The calorific value of gas is higher, can be used as good fuel.
Brief description of the drawings
Fig. 1 is shaft furnace bulk temperature field cloud atlas,
Fig. 2 is shaft furnace process flow chart,
Fig. 3 is shaft furnace body of heater schematic diagram.
Embodiment
The present invention, with addition of a certain amount of coal dust, cement, flux and water, is well mixed using steel plant's dirt mud as primary raw material
Afterwards by shaking cuber, dusting mud Cold-bonded agglomeration is done, agglomerate enters shaft furnace after the maintenance of three days, finally gives thick
Zinc, molten iron and high heating value gas.Specific embodiment is as follows：
Embodiment one：
(1) by blast furnace cloth bag ash, revolving furnace mud, gas mud, mill (furnace) cinder the like waste centralized collection.
(2) dirt mud, coke powder (or coal dust), cement, water are mixed according to 74%, 10%, 8%, 8% ratio respectively, warp
Briquetting is carried out after machine several times is mixed, vibrating punching press by brick machine makes powder pressing into diameter about 70mm agglomerate, then by 3
It maintenance can obtain dirt mud Cold-bonded agglomeration.
(3) dirt walk block is fitted into shaft furnace with a certain proportion of coke and flux and smelted, smelting temperature 1200
DEG C, smelting cycle 4h.
(4) smelt and obtain molten iron and slag, molten iron can be used for pneumatic steelmaking or production cast iron, slag warp after slag sluicing system
Water Quenching is crossed can also to can be directly used for producing non-burning brick, slag wool etc. as the raw material of production cement into after grain slag.
(5) ash-laden gas come out from shaft furnace, can obtain zinc-rich flue dust, as Zn Cr coating processed after gas dust remover purifies
Raw material.
(6) CO contents can reach more than 50% in coal gas, belong to high heating value gas, can be used for the hot blast that generates electricity or return
Furnace technology flow.
Embodiment two：
Dirt mud and a certain amount of cement bonding agent, coal dust are mixed, briquetting is carried out after machine several times is mixed, by pressing brick
Machine vibration punching press makes powder pressing into diameter about 90mm agglomerate, then can obtain dirt mud Cold-bonded agglomeration by the maintenance of 3 days.
Other are identical with embodiment one.
Embodiment three：
Dirt walk block is fitted into shaft furnace with a certain proportion of coke and flux and smelted, smelting temperature is 1100 DEG C,
Smelting cycle is 5h.Other are identical with embodiment one.
Claims (6)
1. a kind of shaft furnace processing steel plant are containing zinc, iron dirt bricklayer's's process, it is characterized in that by steel works sintering, blast furnace, converter, electricity
Stove, all dirt mud of steel rolling process are handled by briquetting, not sintered, enter stove smelting molten iron directly as shaft furnace raw material, specifically
Processing step is as follows：
(1) cloth：Using clock-type cloth, charge composition is：Dirt walk block, coke, flux, ratio are respectively 76%, 23%,
1%, shaft furnace furnace roof and shaft shaft furnace furnace roof use traditional clock-type cloth, and shaft perforate is as shaft furnace exhanst gas outlet；
(2) air blast：Entering stove air quantity is：1630m3/ t, wind-warm syndrome are 1000~1200 DEG C；
(3) coal injection：Injection amount is 30kg/t；
(4) melting：Smelting time 3-5h, smelting temperature are 1150-1250 DEG C；
(5) come out of the stove：Smelting obtains molten iron and slag, and molten iron is used for pneumatic steelmaking or production cast iron, slag warp after slag sluicing system
Cross Water Quenching into after grain slag as production cement raw material or be directly used in and produce non-burning brick, slag wool；
(6) it is vented：The ash-laden gas come out from shaft furnace, can obtain zinc-rich flue dust, as zinc work processed after gas dust remover purifies
The raw material of industry.
2. a kind of shaft furnace processing steel plant are containing zinc, iron dirt bricklayer's's process as claimed in claim 1, it is characterized in that shaft perforate is made
For shaft furnace exhanst gas outlet, the ratio of furnace roof height and shaft shaft furnace height is 1；3, shaft furnace ratio of height to diameter is 8：3, shaft perforate conduct
Shaft furnace exhanst gas outlet, the discharging opening of shaft furnace are located at shaft 4/5-5/6, and blast orifice is located at the 15cm-50cm of discharging opening upper end.
3. a kind of shaft furnace processing steel plant are containing zinc, iron dirt bricklayer's's process as claimed in claim 1, it is characterized in that the dirt mud pressure
The preparation of block is to mix dirt mud, coal dust, cement, water by a certain percentage, wherein dirt mud, coke powder or coal dust, cement, water ratio model
Enclose respectively 70-80%, 10-12%, 8-10%, 8-10%.
4. a kind of shaft furnace processing steel plant are containing zinc, iron dirt bricklayer's's process as claimed in claim 3, it is characterized in that the coke powder or
Coal dust fixes carbon content between 85%-90%.
5. a kind of shaft furnace processing steel plant are containing zinc, iron dirt bricklayer's's process as claimed in claim 3, it is characterized in that described final
The briquetting all iron content arrived is between 35%-40%.
6. a kind of shaft furnace processing steel plant are containing zinc, iron dirt bricklayer's's process as claimed in claim 3, it is characterized in that the dirt mud pressure
Block is to carry out briquetting after machine several times is mixed, and vibrating punching press by brick machine makes powder pressing into diameter 70-110mm group
Block, then can obtain dirt mud Cold-bonded agglomeration by the maintenance of 3 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710981905.5A CN107779534B (en) | 2017-10-20 | 2017-10-20 | Process for treating zinc-containing and iron dust and mud in iron and steel plant by shaft furnace method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710981905.5A CN107779534B (en) | 2017-10-20 | 2017-10-20 | Process for treating zinc-containing and iron dust and mud in iron and steel plant by shaft furnace method |
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| CN107779534A true CN107779534A (en) | 2018-03-09 |
| CN107779534B CN107779534B (en) | 2020-06-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108796217A (en) * | 2018-08-14 | 2018-11-13 | 宝钢工程技术集团有限公司 | A kind of device and method that zinc-iron-containing dust mud resource utilizes |
| CN109097588A (en) * | 2018-10-26 | 2018-12-28 | 宝钢工程技术集团有限公司 | A kind of device and method that iron content solid wastes recycling containing zinc utilizes |
| CN110741101A (en) * | 2017-05-10 | 2020-01-31 | 沙特基础工业全球技术公司 | Method for producing self-reducing pellets/blocks from carbon-mixed dust-collecting ash for steel furnaces |
| CN115261612A (en) * | 2022-08-24 | 2022-11-01 | 武汉科技大学 | ROS shaft kiln for roasting laterite-nickel ore and ROSEF nickel-containing molten iron production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073649A (en) * | 2014-07-11 | 2014-10-01 | 中冶南方工程技术有限公司 | Iron-containing zinc powder recycling process |
| CN106480248A (en) * | 2015-08-31 | 2017-03-08 | 鞍钢股份有限公司 | Blast furnace operation method using dust, mud, iron and carbon balls as partial furnace burden |
-
2017
- 2017-10-20 CN CN201710981905.5A patent/CN107779534B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073649A (en) * | 2014-07-11 | 2014-10-01 | 中冶南方工程技术有限公司 | Iron-containing zinc powder recycling process |
| CN106480248A (en) * | 2015-08-31 | 2017-03-08 | 鞍钢股份有限公司 | Blast furnace operation method using dust, mud, iron and carbon balls as partial furnace burden |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110741101A (en) * | 2017-05-10 | 2020-01-31 | 沙特基础工业全球技术公司 | Method for producing self-reducing pellets/blocks from carbon-mixed dust-collecting ash for steel furnaces |
| CN108796217A (en) * | 2018-08-14 | 2018-11-13 | 宝钢工程技术集团有限公司 | A kind of device and method that zinc-iron-containing dust mud resource utilizes |
| CN108796217B (en) * | 2018-08-14 | 2024-04-19 | 宝钢工程技术集团有限公司 | Device and method for recycling zinc-containing and iron-containing dust mud |
| CN109097588A (en) * | 2018-10-26 | 2018-12-28 | 宝钢工程技术集团有限公司 | A kind of device and method that iron content solid wastes recycling containing zinc utilizes |
| CN115261612A (en) * | 2022-08-24 | 2022-11-01 | 武汉科技大学 | ROS shaft kiln for roasting laterite-nickel ore and ROSEF nickel-containing molten iron production method thereof |
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| Publication number | Publication date |
|---|---|
| CN107779534B (en) | 2020-06-19 |
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