CN1038432C - Method of production for direct reduction furnace charge by cold-consolidation briquetting method - Google Patents
Method of production for direct reduction furnace charge by cold-consolidation briquetting method Download PDFInfo
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- CN1038432C CN1038432C CN95108256A CN95108256A CN1038432C CN 1038432 C CN1038432 C CN 1038432C CN 95108256 A CN95108256 A CN 95108256A CN 95108256 A CN95108256 A CN 95108256A CN 1038432 C CN1038432 C CN 1038432C
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Abstract
The present invention relates to a method of producing a direct reduction furnace charge by a cold-consolidation briquetting method. In the present invention, 0 to 20% of iron ore powder with the particle size of 0 to 3mm and a coal powder with the particle size of 0 to 1mm are used as raw materials, and humate, such as sodium humate, potassium humate and ammonium humate, and quicklime are added according to the proportion of 1: 1 to 3 and used as a binding agent; the binding agent accounts for 2.0 to 8.0% of the total amount of raw materials, water accounting for 7.5 to 9.5% of the total amount of mixtures is added, and the raw materials, the binding agent and the water are briquetted and molded with the pressure of 20 to 30MPa after being blended; the pressed green briquette is dried for 30 to 60 minutes at a temperature of 100 to 300 DEG C. The cold-consolidation briquette has the advantages of favourable moisture resistance, high compressive strength of 1000 to 2000N per briquette, and enhanced production rate of direct reduction and COREX technologies.
Description
The present invention relates to a kind of production method of direct reduction furnace charge, is with the direct reduction of cold fixed briquetting method preparation COREX melting and reducing furnace charge.
The COREX smelting reduction process is uniquely in the tens of kinds of smelting reduction process of developing so far to be used for industrial processing method, have many blast furnace process incomparable superiority, but this method requires to use the massive iron ore raw material, as natural lump ore, pellet and agglomerate, and can be also few for the rich lump ore that COREX technology is directly used in the iron ore resource worldwide, adopt the high temperature agglomeration method of sintering or roasting pelletizing to exist complex process equipment, initial cost is big, the capital construction cycle is long, problems such as energy consumption is high and seriously polluted, therefore the briquetting method without high-temperature roasting is subject to people's attention day by day, but cold fixed briquetting method is inexpensive because of being subjected to always, performance is good, the restriction of the wide binding agent condition of originating and failing in industrial application, Chinese patent application CN85103346A discloses a kind of " process for direct reduction of briquets bound with high molecular substances ", be the aqueous solution with 2～3%NaOH, add the humic coal powder of granularity less than 1mm, with fine ore, behind the fine grinding coal blending, under loose condition (of surface), make ball, wet bulb group is 150～200 ℃ subzero treatment 20～30 minutes, and the pelletizing ultimate compression strength that obtains is 200N/.This method is to make binding agent with Sodium salts humic acids, can obtain metallurgical performance cold bound pellet preferably, but this kind cold bound pellet not moisture-proof, make moist or drenched back intensity and can reduce rapidly until losing intensity, immersing in the water then, pelletizing disintegrates rapidly, thereby be unfavorable for transportation and storage, and pellet forming process requires raw material granularity to want thin.
The objective of the invention is to obtain a kind of cold concretion method production and directly reduce the method for furnace charge, can use the raw material than coarsness, the product wet fastness, physical strength and the reducing property that obtain are better, and can improve the productivity of C0REX technology.
For achieving the above object, the present invention is achieved in that
The cold fixed briquetting method of a kind of usefulness is produced the directly method of reduction furnace charge, be that granularity is added by humate and the lime compound binding agent with 1: 1～3 composition of proportions less than the powdered iron ore of 3mm, this compound binding agent is 2.0～8.0wt% of raw material total amount, the water that adds compound total amount 7.5～9.5wt% then, mix the back with 20～30MPa pressure compound stalk forming, the green briquette of compacting can obtain required direct reduction furnace charge in dry 30～60 minutes down at 100-300 ℃.
The humate that adds is Sodium salts humic acids, potassium humate, ammonium humate and rotten sour phytic acid ca.
Also can contain the coal of 0～20wt% granularity in the above-mentioned raw materials less than 1mm.
The optimum range of above-mentioned compound binding agent is 6～7wt% of raw material total amount.
Below the present invention is further described.
Key of the present invention is the binding agent of cold fixed briquetting method is improved, be that to adopt the humate additional proportion be that 1: 1～3 unslaked lime carries out modification and gets, humate comprises Sodium salts humic acids, potassium humate and ammonium humate, and wherein, the intensity of Sodium salts humic acids is best.The purpose that adds the unslaked lime modification is in order to make cold fixed ore deposit have wet fastness, and this is because humate is a hydroaropic substance, adds unslaked lime and reacts Ca (OH) with it
2With humate reacting generating complex or inner complex, while Ca (OH)
2In calcium ion make the polymer generation cohesion in the humate make the humate thread-like molecule be transformed into netted colloid, binding agent is not the existed hydrophilic radical of " residue ", thus make that bonding is mutually hydrophobic.Simultaneously, unslaked lime itself also is a kind of binding agent, can improve the intensity of agglomerate; Can improve the basicity of agglomerate again, help smelting process.
The proportioning of binding agent is controlled in 2.0～8.0wt% scope, with the impurity of avoiding binding agent to bring into COREX technology or direct reduction process is exerted an adverse impact.
The moisture scope of compound is 7.5～9.5wt%, with the powdered iron ore below the 3mm, 0～20wt%, the following coal dust of 1mm is a raw material, after adding binding agent wet compound is carried out mixing to knead fully rolling, the time is 5～10 minutes, to guarantee that binding agent is evenly distributed in compound.Compound behind the mixing enters the briquetting press compound stalk forming, the pressure 20～30MPa of briquetting press, and hypotony, intensity can not get guaranteeing, hypertonia, pressure can be extruded the binding agent in the compound, causes the strength degradation of product.The green briquette of compacting is with 100～300 ℃ hot waste gas drying 30～60 minutes, and cold fixed nugget or contain the colliery piece gets product.
Introduce effect of the present invention below in conjunction with embodiment.
Less than 3mm, the powdered iron ore of TFe6 2.5% and granularity are that 78.7% coal dust is made raw material less than 1mm, fixed carbon with granularity, add the binding agent of different proportionings by composition in the table 1, behind thorough mixing at the briquetting press upper holder block.The living piece that extrudes was through 100～200 ℃ temperature drying 30 minutes, and the performance such as the table 1 that obtain the cold fixed ore deposit of finished product show.
The cold fixed reduction furnace charge of producing with the inventive method on simulation COREX prereduction fixed bed unit reduction (the reducing gas composition is CO 70%, H
225%, CO
25%), the time that reaches constant weight is 80～100 minutes, and degree of metalization is 93.1～97.8%, and the time that natural lump ore and acid pellet reach constant weight is 110～140 minutes, and degree of metalization is 89.4～96.0%.
The cold fixed reduction furnace charge of producing with the inventive method on simulation COREX prereduction moving-bed shaft furnace equipment reduction (the reducing gas composition is CO 70%, H
225%, CO
25%), reduction cycle is 193 minutes, and degree of metalization is 99.6%.The reduction cycle of natural lump ore is 226 minutes, and degree of metalization is 96.3%.
Compared with prior art, the cold fixed nugget that obtains of the present invention have good moisture-proof, Water proofing property is conducive to area many at rainwater, high humidity and transports, stores, and compression strength is big, reaches To 1000N/, can use the coarse grain raw material. Simultaneously, its high temperature metallurgical properties (as: reproducibility, Reduction swellability, thermal explosion fragility, strength after being reduced and cooled and low temperature reduction degradation) all can satisfy The technological requirement of COREX prereduction, and this nugget has good reproducibility, and can bear higher Reduction temperature and not soft heat bonding (it does not bond when 1000 ℃ of reduction, hanging). Therefore allow to improve the operating temperature of COREX reduction shaft furnace, shorten furnace charge in COREX prereduction Holdup time in the shaft furnace, thus the COREX reduction shaft furnace alleviated to the 'bottleneck' restrictions of COREX, So that the productivity ratio of whole COREX technology is improved.
Table 1
| Binding agent (wt%) | Compression strength N/ | RI (％) | RDI (％) | RSI (％) | The thermal explosion fragility | |
| Sodium humate | Quick lime | |||||
| 3.0 | 3.0 | 1280 | 92.4 | 51.3 | 12.5 | Not explosion |
| 2.0 | 4.0 | 1148 | 87.6 | 56.7 | 11.8 | Not explosion |
| 2.0 | 5.0 | 1018 | 89.3 | 58.9 | 13.9 | Not explosion |
| 3.5 | 3.5 | 1360 | 93.2 | 61.4 | 10.6 | Not explosion |
Claims (4)
1. produce the method for furnace charge of directly reducing with cold fixed briquetting method for one kind, it is characterized in that: with the powdered iron ore adding humate of granularity less than 3mm, with the compound binding agent of unslaked lime with 1: 1～3 composition of proportions, this compound binding agent is 2.0～8.0wt% of raw material total amount, the water that adds compound total amount 7.5～9.5wt% then, mix the back with 20～30MPa pressure compound stalk forming, the green briquette of compacting can arrive required direct reduction furnace charge in dry 30～60 minutes down at 100～300 ℃.
2. method according to claim 1 is characterized in that: described humate is Sodium salts humic acids, potassium humate, calcium humate and ammonium humate.
3. method according to claim 1 is characterized in that: contain the coal of 0～20wt% granularity less than 1mm in the described raw material.
4. method according to claim 1 is characterized in that: the optimum range of described binding agent is 6～7wt% of raw material total amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95108256A CN1038432C (en) | 1995-07-21 | 1995-07-21 | Method of production for direct reduction furnace charge by cold-consolidation briquetting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95108256A CN1038432C (en) | 1995-07-21 | 1995-07-21 | Method of production for direct reduction furnace charge by cold-consolidation briquetting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1120074A CN1120074A (en) | 1996-04-10 |
| CN1038432C true CN1038432C (en) | 1998-05-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95108256A Expired - Fee Related CN1038432C (en) | 1995-07-21 | 1995-07-21 | Method of production for direct reduction furnace charge by cold-consolidation briquetting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1038432C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100879680B1 (en) * | 2001-05-08 | 2009-01-21 | 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 앤드 컴퍼니 | Method and installation for utilizing waste products, which contain hydrocarbons and iron oxide, particularly mill scale sludges and coal fines |
| CN1318616C (en) * | 2003-10-28 | 2007-05-30 | 马万龙 | Iron ore powder sintering-free cold-pressing balling method |
| CN102312088A (en) * | 2011-07-01 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Cold bonding briquette production method using powder material |
| CN102560095B (en) * | 2012-02-08 | 2013-06-12 | 河北钢铁股份有限公司邯郸分公司 | Process and special equipment for blocking carbon-containing briquette by hot tamping |
| CN103643041B (en) * | 2013-12-20 | 2015-07-15 | 长沙市东新矿冶科技开发有限公司 | Novel technology for preparing low vanadium-titanium alloy comminuted steel shot through vanadium and titanium iron concentrate |
| CN104164560B (en) * | 2014-08-28 | 2016-04-06 | 中南大学 | A kind of iron ore pellets Sodium salts humic acids binder solution and its preparation method and application |
| CN104164559B (en) * | 2014-08-28 | 2016-11-30 | 中南大学 | A kind of method improving difficult pelletizing iron ore concentrate balling-up |
| CN105950863B (en) * | 2016-05-11 | 2018-07-17 | 江苏省冶金设计院有限公司 | Ferronickel powder forming method |
| CN110523218A (en) * | 2019-09-05 | 2019-12-03 | 上海第二工业大学 | CO in CaO compound and preparation method and its absorption exhaust gas2Method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103346A (en) * | 1985-04-20 | 1986-10-15 | 中南工业大学 | Process for direct reduction of briquets bound with high molecular substances |
| CN1088618A (en) * | 1992-12-23 | 1994-06-29 | 中南工业大学 | Direct reduction technology for compound adhesive cool solidifying globus coal base |
-
1995
- 1995-07-21 CN CN95108256A patent/CN1038432C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103346A (en) * | 1985-04-20 | 1986-10-15 | 中南工业大学 | Process for direct reduction of briquets bound with high molecular substances |
| CN1088618A (en) * | 1992-12-23 | 1994-06-29 | 中南工业大学 | Direct reduction technology for compound adhesive cool solidifying globus coal base |
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| Publication number | Publication date |
|---|---|
| CN1120074A (en) | 1996-04-10 |
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Owner name: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Free format text: FORMER NAME OR ADDRESS: BAOSHAN STEEL GROUP IRON AND STEEL CO LTD Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD |
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Address after: Orchard, Fujin Road, Baoshan District, Shanghai Patentee after: BAOSHAN IRON & STEEL Co.,Ltd. Address before: No. 370 Pu circuit, Shanghai, Pudong New Area Patentee before: BAOSHAN IRON & STEEL CO.,LTD. Address after: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee after: BAOSHAN IRON & STEEL CO.,LTD. Address before: 201900 No. 1, Middle Road, Baoshan District, Shanghai Patentee before: Baosteel Group Corporation |
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Granted publication date: 19980520 Termination date: 20130721 |