CN106566904A - Method of one-step reducing melted iron ore concentrate to obtain low sulfur/phosphor pig iron - Google Patents
Method of one-step reducing melted iron ore concentrate to obtain low sulfur/phosphor pig iron Download PDFInfo
- Publication number
- CN106566904A CN106566904A CN201610944655.3A CN201610944655A CN106566904A CN 106566904 A CN106566904 A CN 106566904A CN 201610944655 A CN201610944655 A CN 201610944655A CN 106566904 A CN106566904 A CN 106566904A
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- Prior art keywords
- iron
- pig iron
- ore concentrate
- phosphor
- waste residue
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
A method of one-step reducing melted iron ore concentrate to obtain low sulfur/phosphor pig iron is disclosed. The method comprises the following steps: grinding a carbon reducing agent into particles, mixing the particles with iron ore concentrate and additives to obtain a mixed mineral material; adding the mixed mineral material into a molten pool furnace from the feed opening in the top of the molten pool furnace, melting the mixed mineral material, heating the temperature to 1100 DEG C, introducing oxygen gas into the furnace, carry out melting to generate pig iron and residues, discharging the residues, increasing the pressure, and carrying out blow-melting at a temperature of 1350 to 1400 DEG C to obtain low sulfur/phosphor pig iron. Through molten pool smelting, the iron reduction and sulfur/phosphor removal are completed in one step; a novel efficient economic technology is provided for comprehensive utilization of low sulfur/phosphor pig iron; compared with the conventional technology, which carries out blast furnace smelting and slag former addition in sequence, the provided method has the advantages of short flow, little investment, low production cost, little environment pollution, and high comprehensive recovery rate; moreover, the produced pig iron is low in sulfur and phosphor, and the quality is high.
Description
Technical field
The invention belongs to smart iron ore field of smelting, and in particular to a kind of step reduction melting iron ore concentrate obtains the low-sulfur phosphorus pig iron
Method.
Background technology
The traditional handicraft of iron ore concentrate ironmaking is that Iron Ore Powder pelletizing is put in sintering furnace to sinter, and smelting in blast furnace is sent into after sintering
Regular pig is produced in refining.It is this it is conventionally produced go out pig iron sulphur phosphorus content it is high, pig iron quality is relatively low.
Sulphur is harmful element in the pig iron, and it promotes iron to be combined with carbon, makes iron firmly crisp, and the sulphur of low melting point is combined to iron
Change iron, make the pig iron produce red brittleness and lower the mobility of iron liquid. so the high pig iron of sulfur-bearing is unsuitable for casting assembly.Phosphorus also belongs to
In harmful element, but phosphorus increases can the mobility of molten iron, this is because phosphorus reduces pig iron fusing point, so in the product having
Often phosphorus content is higher, but the presence of phosphorus makes iron increase hard fragility again, and excellent pig iron phosphorus content should lack.
At present, low-sulfur, hematite iron are produced, needs after blast furnace process, to add the slag formers such as fluorite to relay in high temperature furnace
Continuous to smelt, equipment investment is big, long the production cycle, and production cost is high, seriously polluted.
The content of the invention
The technical problem to be solved is to provide for a kind of step reduction melting iron ore concentrate and obtains the low-sulfur phosphorus pig iron
Method, the method is with short production cycle, efficiency high, and the pig iron sulphur produced, phosphorus content are low, and pig iron quality is high.
The technical problem to be solved in the present invention is：
The method that one step reduction melting iron ore concentrate obtains the low-sulfur phosphorus pig iron, it is comprised the following steps that：
(1) dispensing
Carbonaceous reducing agent is ground into into the particle that granularity is 1mm～30mm, is then mixed with iron ore concentrate, additive, obtained
Mixing mineral aggregate, the iron ore concentrate is 100 with the mass ratio of additive, reducing agent:(8～28):(8～18)；
(2) feed intake melting
Mixing mineral aggregate is sent in body of heater from the charge door of molten bath stove furnace roof, mixing mineral aggregate is melted and is warming up to 1100 DEG C,
Oxygen is blown in 5～7 oxygen lances that 5 °～15 ° of angle is arranged with vertical direction by being arranged on molten bath stove furnace bottom,
The gas pressure of oxygen lance is controlled in 0.6MPa～0.7MPa, and melting 1 hour～3 is carried out at a temperature of 1100 DEG C～1350 DEG C
Hour, the pig iron and waste residue material are generated, waste residue material is discharged, continue to increase oxygen lance pressure in 1350 DEG C～1400 DEG C blowing, oxygen
The gas pressure control of gas spray gun is blown 30 minutes～40 minutes in 0.7MPa～0.8MPa, obtains the low-sulfur phosphorus pig iron.
Further, the waste residue material poured out is carried out into Water Quenching, then leaches in water, filters, separates, acquisition can be again
The additive for using again and waste residue.
Further, the iron ore concentrate main component includes iron and waste residue, and the mass fraction of iron is 60%～70%；Waste residue
Mass fraction be 30%～40%, wherein sulphur, the content of phosphorus is not higher than 0.5%.
Further, the additive is in sodium chloride, sodium carbonate, NaOH, sodium sulphate, Boratex and sodium acid carbonate
At least one.
Further, the carbonaceous reducing agent is at least one in anthracite, bituminous coal, brown coal and coke.
Further, the mass fraction of iron is 98%～99.95% in step (2) the low-sulfur phosphorus pig iron；Other impurity
Mass percent be 0.05%～2%, wherein, sulphur be less than 0.005%, phosphorus be less than 0.005%.
The invention has the beneficial effects as follows：
Smelted by molten bath stove, a step realizes the reduction of iron and sulphur, the removal of phosphorus impurities, be the comprehensive profit of the low-sulfur phosphorus pig iron
With having started a new technology efficiently, economic.With traditional first blast furnace process, slag former high temperature furnace is then added again and smelts stream
Journey is compared, with technological process it is short, equipment investment is little, low production cost, that environmental pollution is little, comprehensive recovery is high etc. is significantly excellent
Point, and the pig iron sulphur that produces, phosphorus content are low, pig iron quality is high.
Specific embodiment
Embodiment 1
(1) dispensing
Iron ore concentrate composition is as follows：
| Title | Grade | Fe | S | P | Mg | Si | Ti |
| Iron ore concentrate % | 66 | 66 | 0.05 | 0.046 | 0.81 | 3 | 0.74 |
Carbonaceous reducing agent anchracite duff is broken into into the particle that granularity is 1mm～30mm, is then mixed with iron ore concentrate, sodium chloride
Close, obtain mixing mineral aggregate, the iron ore concentrate is 100 with sodium chloride, anthracitic mass ratio:8:18；
(2) feed intake melting
Mixing mineral aggregate is sent in body of heater from the charge door of molten bath stove furnace roof, mixing mineral aggregate is melted and is warming up to 1100 DEG C,
Oxygen is blown in 7 oxygen lances that 5 ° of angle is arranged with vertical direction by being arranged on molten bath stove furnace bottom, oxygen lance
Gas pressure is controlled in 0.6MPa, and melting 3 hours is carried out at a temperature of 1100 DEG C, generates the pig iron and waste residue material, discharges waste residue material,
Continue to increase oxygen lance pressure in 1350 DEG C of blowing, the gas pressure control of oxygen lance is blown 30 minutes in 0.8MPa, obtained
To the low-sulfur phosphorus pig iron；The mass fraction of iron is 98.5% in the low-sulfur phosphorus pig iron, and the mass fraction of sulphur is 0.0048%, the matter of phosphorus
Amount fraction is 0.0047%；
The waste residue material poured out carries out Water Quenching, then leaches in water, filters, separates, and obtains reusable adding
Plus agent and waste residue.
Embodiment 2
(1) dispensing
Iron ore concentrate composition is as follows：
| Title | Grade | Fe | S | P | Mg | Si | Ti |
| Iron ore concentrate % | 70 | 70 | 0.048 | 0.049 | 0.83 | 2.98 | 0.72 |
Carbonaceous reducing agent bituminous coal is ground into into the particle that granularity is 1mm～30mm, then with iron ore concentrate, Sodium Carbonate Additive
Mixing, obtains mixing mineral aggregate, and the iron ore concentrate is 100 with the mass ratio of sodium carbonate, bituminous coal:28:8；
(2) feed intake melting
Mixing mineral aggregate is sent in body of heater from the charge door of molten bath stove furnace roof, mixing mineral aggregate is melted and is warming up to 1100 DEG C,
Oxygen is blown in 5 oxygen lances that 15 ° of angle is arranged with vertical direction by being arranged on molten bath stove furnace bottom, oxygen lance
Gas pressure is controlled in 0.7MPa, and melting 1 hour is carried out at a temperature of 1350 DEG C, generates the pig iron and waste residue material, discharges waste residue material,
Continue to increase oxygen lance pressure in 1400 DEG C of blowing, the gas pressure control of oxygen lance is blown 40 minutes in 0.7MPa, obtained
To the low-sulfur phosphorus pig iron；The mass fraction of iron is 99.95% in the low-sulfur phosphorus pig iron, and the mass fraction of sulphur is 0.0047%, phosphorus
Mass fraction be 0.0048%；
The waste residue material poured out carries out Water Quenching, then leaches in water, filters, separates, and obtains reusable adding
Plus agent and waste residue.
Embodiment 3
(1) dispensing
Iron ore concentrate composition is as follows：
| Title | Grade | Fe | S | P | Mg | Si | Ti |
| Iron ore concentrate % | 60 | 60 | 0.050 | 0.050 | 0.87 | 3.11 | 0.71 |
Carbonaceous reducing agent coke is ground into into the particle that granularity is 1mm～30mm, then with iron ore concentrate, additive sodium sulphate
Mixing, obtains mixing mineral aggregate, and the iron ore concentrate is 100 with the mass ratio of sodium sulphate, coke:15:12；
(2) feed intake melting
Mixing mineral aggregate is sent in body of heater from the charge door of molten bath stove furnace roof, mixing mineral aggregate is melted and is warming up to 1100 DEG C,
Oxygen is blown in 6 oxygen lances that 10 ° of angle is arranged with vertical direction by being arranged on molten bath stove furnace bottom, oxygen lance
Gas pressure is controlled in 0.65MPa, and melting 2 hours is carried out at a temperature of 1200 DEG C, generates the pig iron and waste residue material, discharges waste residue
Material, continues to increase oxygen lance pressure in 1380 DEG C of blowing, and the gas pressure control of oxygen lance is blown 35 points in 0.75MPa
Clock, obtains the low-sulfur phosphorus pig iron；The mass fraction of iron is 98.5% in the low-sulfur phosphorus pig iron, and the mass fraction of sulphur is
0.0047%, the mass fraction of phosphorus is 0.0048%；
The waste residue material poured out carries out Water Quenching, then leaches in water, filters, separates, and obtains reusable adding
Plus agent and waste residue.
The specific embodiment of the present invention is these are only, the present invention is not limited to, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (6)
1. the method that a step reduction melting iron ore concentrate obtains the low-sulfur phosphorus pig iron, is characterized in that：
Comprise the following steps：
(1) dispensing
Carbonaceous reducing agent is ground into into the particle that granularity is 1mm～30mm, is then mixed with iron ore concentrate, additive, mixed
Mineral aggregate, the iron ore concentrate is 100 with the mass ratio of additive, reducing agent:(8～28):(8～18)；
(2) feed intake melting
Mixing mineral aggregate is sent in body of heater from the charge door of molten bath stove furnace roof, mixing mineral aggregate is melted and is warming up to 1100 DEG C, is passed through
It is arranged on molten bath stove furnace bottom and is blown into oxygen, oxygen in 5～7 oxygen lances that 5 °～15 ° of angle is arranged with vertical direction
The gas pressure of spray gun is controlled in 0.6MPa～0.7MPa, melting 1 hour～3 is carried out at a temperature of 1100 DEG C～1350 DEG C little
When, the pig iron and waste residue material are generated, waste residue material is discharged, continue to increase oxygen lance pressure in 1350 DEG C～1400 DEG C blowing, oxygen
The gas pressure control of spray gun is blown 30 minutes～40 minutes in 0.7MPa～0.8MPa, obtains the low-sulfur phosphorus pig iron.
2. method according to claim 1, is characterized in that：The waste residue material poured out is carried out into Water Quenching, then in water
Leach, filter, separate, obtain reusable additive and waste residue.
3. method according to claim 1, is characterized in that：The iron ore concentrate main component includes iron and waste residue, the matter of iron
Amount fraction is 60%～70%；The mass fraction of waste residue is 30%～40%, and wherein sulphur, the content of phosphorus is not higher than 0.5%.
4. method according to claim 1, is characterized in that：The additive is sodium chloride, sodium carbonate, NaOH, sulphur
At least one in sour sodium, Boratex and sodium acid carbonate.
5. method according to claim 1, is characterized in that：The carbonaceous reducing agent is anthracite, bituminous coal, brown coal and coke
In at least one.
6. method according to claim 1, is characterized in that：The mass fraction of iron is in step (2) the low-sulfur phosphorus pig iron
98%～99.95%；The mass percent of other impurity is 0.05%～2%, wherein, sulphur is less than 0.005%, and phosphorus is less than
0.005%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610944655.3A CN106566904B (en) | 2016-11-02 | 2016-11-02 | The method that one step reduction melting iron ore concentrate obtains the low-sulfur phosphorus pig iron |
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| CN201610944655.3A CN106566904B (en) | 2016-11-02 | 2016-11-02 | The method that one step reduction melting iron ore concentrate obtains the low-sulfur phosphorus pig iron |
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| CN106566904A true CN106566904A (en) | 2017-04-19 |
| CN106566904B CN106566904B (en) | 2018-10-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042185A (en) * | 1988-10-25 | 1990-05-16 | 奥地利钢铁联合企业阿尔帕工业设备制造有限公司 | The production method of molten iron and equipment |
| JP2004309067A (en) * | 2003-04-09 | 2004-11-04 | Nippon Steel Corp | Method of using blast furnace gas |
| CN103911561A (en) * | 2013-01-08 | 2014-07-09 | 朝阳鸿翔高新材料有限公司 | Low-phosphorus low-sulphur nickel-containing pig iron and its preparation method |
-
2016
- 2016-11-02 CN CN201610944655.3A patent/CN106566904B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042185A (en) * | 1988-10-25 | 1990-05-16 | 奥地利钢铁联合企业阿尔帕工业设备制造有限公司 | The production method of molten iron and equipment |
| JP2004309067A (en) * | 2003-04-09 | 2004-11-04 | Nippon Steel Corp | Method of using blast furnace gas |
| CN103911561A (en) * | 2013-01-08 | 2014-07-09 | 朝阳鸿翔高新材料有限公司 | Low-phosphorus low-sulphur nickel-containing pig iron and its preparation method |
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| CN106566904B (en) | 2018-10-12 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A method of producing low sulphur and phosphorus pig iron by one-step reduction smelting iron concentrate Effective date of registration: 20220929 Granted publication date: 20181012 Pledgee: Chaoyang County Sub branch of Chaoyang Bank Co.,Ltd. Pledgor: CHAOYANG LIBAO HEAVY MACHINERY INDUSTRY Group Corp. Registration number: Y2022210000158 |
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Date of cancellation: 20230620 Granted publication date: 20181012 Pledgee: Chaoyang County Sub branch of Chaoyang Bank Co.,Ltd. Pledgor: CHAOYANG LIBAO HEAVY MACHINERY INDUSTRY Group Corp. Registration number: Y2022210000158 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A method for obtaining low sulfur and phosphorus pig iron by one-step reduction smelting of iron concentrate Effective date of registration: 20230620 Granted publication date: 20181012 Pledgee: Chaoyang County Sub branch of Chaoyang Bank Co.,Ltd. Pledgor: CHAOYANG LIBAO HEAVY MACHINERY INDUSTRY Group Corp. Registration number: Y2023210000155 |
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