CN85103346A - Process for direct reduction of briquets bound with high molecular substances - Google Patents
Process for direct reduction of briquets bound with high molecular substances Download PDFInfo
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- CN85103346A CN85103346A CN85103346.6A CN85103346A CN85103346A CN 85103346 A CN85103346 A CN 85103346A CN 85103346 A CN85103346 A CN 85103346A CN 85103346 A CN85103346 A CN 85103346A
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Abstract
Process for direct reduction of briquets bound with high molecular substances belongs to sponge iron and Metal Production field, it is characterized in that making by oneself the polymer compound binding agent, makes composite briquette ore with concentrate and coal dust.This pelletizing resistance to compression＞20 kilogram/ball fall＞20 times/0.5 meter, and abrasion resistance index is below 1%, and no reduction degradation phenomenon can effectively solve the powder ring formation.This pelletizing metallurgical performance is good, can make the rotary kiln utilization coefficient mention 3.0 from 0.5～0.7, and can save energy 50%.This binding agent, cost is low, preparation is easy, viscosity is good.Opened up metallurgical approach for lacking burnt area.The present invention may be used on black, coloured and nonmetal breeze moulding process.
Description
The invention belongs to the production field of direct reducing sponge iron and metal.
Deficient day by day along with coking coal all paid attention to non-coking coal both at home and abroad and directly reduced research.According to the documents and materials that last decade comes, 50 to the sixties Germany Lurgi company that is mainly that wherein is used to produce at first develops the Krupp method of cooperating the proposition of improved SL/RN method and Germany Krupp company with the Steel Co., of Canada Ltd..These class methods are made ball after normally iron ore concentrate being added the bentonite mixing, wet bulb group is fixed through the dry high temperature preheating of drying grate, 10～1 millimeters non-coking coal powder is mixed into the big rotary kiln reduction of length-to-diameter ratio (L/D ≈ 20) together again, and the gained metallized pellet is used for Electric furnace steel making or replaces steel scrap steel-making.Its great advantage is with non-coking coal reduced iron direct steelmaking, and does not walk traditional blast furnace ironmaking steel-making road, but still has several major technique key issues: the one, and the rotary kiln utilization coefficient is low, is generally 0.5～0.7; The 2nd, energy consumption is very big, and general consumption goes back raw coal and coal combustion is 0.6～1.0 ton of/ton iron; The 3rd, rotary kiln easily produces ring formation, has a strong impact on ordinary production.Thereby the production cost height has limited the development and the application of non-coking coal direct-reduction process.
The objective of the invention is to study the fixed composite pellet direct-reduction process of a kind of polymer that addresses the above problem.It is to start with from concentrate and non-coking coal, with the fixed composite briquette ore of linear macromolecule, changes existing direct reducing process.Its principal feature is: (1) with granularity less than 1.0 millimeters humic coal powder (containing humic acids more than 30%) be equivalent to the sodium hydroxide (being made into the aqueous solution that contains NaOH2～3%) of coal dust weight 4～5%, in the heated and stirred groove, prepare, its preparation condition is: according to suitable ball moisture content and the binding agent consumption made, coal liquid weight ratio is (1.0～2.0): 1.0, and preparation temperature is 80～100 ℃; Preparation time is 30 minutes; Solution PH＞9; And under heat-retaining condition, use.(2) with the binder solution amount that contains 2～3% humates (butt meter), with weight ratio is that the fine grinding pulverized anthracite of 87～88% fine ore and 9～10% mixes, compound moisture content should be lower than makes ball moisture content 1～2%, preferably behind damp mill (or wheel roller) mixing, under loose condition (of surface), make the composite briquette ore of 10 millimeter.Wet bulb group should progressively heat up, and after 150～200 ℃ of Temperature Treatment 20～30 minutes (increasing and decreasing according to the local climate condition), promptly gets intensity height, wear resisting property is good and reduction rate is fast composite finished product ball.(3) finished ball and account for 40～60% of pelletizing weight, granularity is that 10～1 millimeters non-coking coal powder reduce in the little rotary kiln of length-to-diameter ratio (L/D=10～15), and its reduction temperature is mainly decided (also relevant with the ash soft heat point of reductive agent coal) on breeze character: the vanadium titano-magnetite composite pellet is 1200～1250 ℃; Common iron ore composite pellet is 1100～1150 ℃; It is 1150～1200 ℃ that zinc baking sand and zinc leaching residue composite pellet steam the zinc temperature.Pelletizing stops the back time in kiln be 50～60 minutes (from 800 ℃ on kiln tail, the heating-up time is 30～40 minutes, and the high temperature reduction time is 10～15 minutes).Under these conditions, the iron ore pellet metallization rate is more than 90%, and then output is bigger if produce pre-reduced pellet; The rate of recovery of zinc baking sand pelletizing zinc is more than 97%.And can to add granularity be 3～1 millimeters limestone desulfurizations.(4) be porous metal pellet or pre-reduced pellet after the iron ore composite pellet reduction, kiln hood should spray into 5～1 millimeters pulverized anthracites, reoxidizes and the high temperature melting ring formation to prevent metallic iron.Kiln tail high-temp waste gas can be used to generating.
The present invention compares with existing method, and following advantage and effect are arranged: 1. make the polymer compound binding agent by oneself, raw material sources are wide, cost is low; Adhesive preparation is simple, and is easy to use, and adhesive property is good.2. between the pelletizing endoparticle because linear macromolecule " bridge chain " effect, the finished ball after the low-temperature heat treatment, the physical strength height: resistance to compression＞20 kilogram/ball fall greater than 20 times/0.5 meter; Especially wear resisting property is superior, less than 0.6 millimeter below 1.0%, can effectively solve rotary kiln powder ring formation fault.3. iron ore composite pellet does not have the low temperature reduction degradation phenomenon, has overcome the low-temperature reduction that the oxidation concretion pelletizing brought and has expanded and the atomizing problem.4. the composite pellet reduction rate is fast, add that binding agent itself has autocatalytic action, when reduction temperature was higher than 1000 ℃, the inside and outside metallic compound of pelletizing reduced simultaneously, not controlled by diffusion process, thereby the rotary kiln utilization coefficient can bring up to 3.0 from 0.5～0.7.Improved the effective rate of utilization of coal simultaneously.5. composite pellet reduction energy consumption is low, and binding agent itself is exactly the energy and reductive agent, has saved high temperature preheating oxidation concretion process simultaneously, adds that the rotary kiln utilization coefficient is high and the ring formation accident is few, so can save energy more than 50%.
Implementing preferred plan of the present invention is: be 88% fine ore and 10% fine grinding coal dust by weight, add 2% humate (butt meter) self-control binder solution, behind mixing, make 10 millimeter pellets, wet bulb is pressed progressively temperature-raising method, 180～200 ℃ of subzero treatment 30 minutes, again with account for 40～60% of pelletizing weight, granularity is that 10～1 millimeters non-coking coal powder mix, and enters kiln hood and is provided with in the little rotary kiln of spray meal device length-to-diameter ratio and reduces.Being rapidly heated and high temperature reduction 10～15 minutes, then can obtain the metallized pellet of degree of metalization 90% or more, if handle zinc baking sand composite pellet, metal recovery rate more than 97%, not only output is big, the while can realize that associated metal comprehensively reclaims.
The present invention also may be used on black, coloured and Non-Metallic Mineral is compressing (Iron Ore Powder, manganese ore powder, copper concentrate, antimony concentrate, ground phosphate rock and pyrite dust), to improve the furnace charge physico-chemical property of small furnace, blast furnace, shaft furnace, electric furnace, improve smelting technique index and economic benefit.
Claims (8)
1, a kind of oxidation concretion pelletizing direct-reduction process, belong to direct reduction of iron ore sponge iron and Metal Production field, be that iron ore concentrate is added the mixed ball of bentonite, wet bulb group's drying high temperature preheating is fixed, be mixed into the big rotary kiln reduction of length-to-diameter ratio with non-coking rough coal powder again, the invention is characterized in the same fine ore of polymer compound binding agent humate solution, make ball behind the coal blending, wet bulb group obtains finished ball through subzero treatment, sends into the reducing process of the little rotary kiln of length-to-diameter ratio again with non-coking rough coal powder.
2, according to claim 1, it is characterized in that the polymer compound binding agent is in containing NaOH2～3% aqueous solution, add granularity less than 1 millimeter humic coal powder (containing humic acids more than 30%), coal liquid weight ratio is (1.0～2.0): 1.0, solution PH＞9, in the steel basin of 90～100 ℃ of heating, stir and made in 30 minutes.
3, according to claim 1, it is characterized in that by weight 87% fine ore and 9～10% fine grinding pulverized anthracite, interpolation 2～3%(butt meter) after the humate binder solution mixes, makes the composite briquette ore of diameter 10 millimeter through damp mill (or wheel roller) mixing.
4, according to claim 1, it is characterized in that compound moisture content should be lower than to make ball moisture content 1～2%, and answer under the loose condition (of surface) and make ball.Wet bulb group was by temperature-raising method progressively, 150～200 ℃ subzero treatment 20～30 minutes.
5, according to claim 1, it is characterized in that composite briquette ore, the employing length-to-diameter ratio is 10～15 rotary kiln reduction, and is provided with spray rough coal powder device at kiln hood, kiln tail hot waste gas can be used for generating.
6, according to claim 1 and 3, the reduction temperature that it is characterized in that the vanadium titano-magnetite composite pellet is 1200～1250 ℃, general iron ore composite pellet reduction temperature is 1100～1150 ℃, and it is 1150～1200 ℃ that zinc baking sand or zinc leaching residue composite pellet steam the zinc temperature.
7, according to claim 1,3 and 5 described, it is characterized in that composite briquette ore heating-up time in rotary kiln is 30～40 minutes, the high temperature reduction time is 10～15 minutes, stops in kiln 50～60 minutes.
8, according to claim 1,2 and 3 described, it is characterized in that to promote the use of powdered iron ore, manganese ore powder, copper ore concentrates, antimony concentrate, ground phosphate rock and pyritic ashes extrusion forming technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103346.6A CN1003307B (en) | 1985-04-20 | 1985-04-20 | Process for direct reduction of briquets bound with high molecular substances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103346.6A CN1003307B (en) | 1985-04-20 | 1985-04-20 | Process for direct reduction of briquets bound with high molecular substances |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103346A true CN85103346A (en) | 1986-10-15 |
| CN1003307B CN1003307B (en) | 1989-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85103346.6A Expired CN1003307B (en) | 1985-04-20 | 1985-04-20 | Process for direct reduction of briquets bound with high molecular substances |
Country Status (1)
| Country | Link |
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| CN (1) | CN1003307B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037114C (en) * | 1993-04-16 | 1998-01-21 | 中南工业大学 | High-resistance high-activity charging stock for electric furnace and its producing method |
| CN1037193C (en) * | 1994-05-23 | 1998-01-28 | 冶金工业部长沙矿冶研究院 | Method for producing direct reduced iron |
| CN1038432C (en) * | 1995-07-21 | 1998-05-20 | 宝山钢铁(集团)公司 | Method of production for direct reduction furnace charge by cold-consolidation briquetting method |
| CN102534202A (en) * | 2012-01-31 | 2012-07-04 | 安徽朗斯特复合材料科技有限公司 | Method for producing bulk manganese ore furnace charge |
| CN102851491A (en) * | 2012-08-06 | 2013-01-02 | 莱芜钢铁集团有限公司 | Red mud composite binder for oxidized pellets |
| CN103100719A (en) * | 2012-11-12 | 2013-05-15 | 柳州百韧特先进材料有限公司 | Technological process for producing zinc powder |
| CN103898318A (en) * | 2012-12-31 | 2014-07-02 | 攀钢集团研究院有限公司 | Pelletizing method, pellet ore fresh pellet and pellet ore |
| CN104164560A (en) * | 2014-08-28 | 2014-11-26 | 中南大学 | Sodium humate adhesive solution for iron ore pellets as well as preparation method and application of sodium humate adhesive solution |
| CN104164559A (en) * | 2014-08-28 | 2014-11-26 | 中南大学 | Method for improving pelletizability of low-pelletizability iron concentrate |
| CN110155970A (en) * | 2019-06-12 | 2019-08-23 | 攀枝花学院 | Phosphorus ore micro mist pelletizing and preparation method thereof |
-
1985
- 1985-04-20 CN CN85103346.6A patent/CN1003307B/en not_active Expired
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037114C (en) * | 1993-04-16 | 1998-01-21 | 中南工业大学 | High-resistance high-activity charging stock for electric furnace and its producing method |
| CN1037193C (en) * | 1994-05-23 | 1998-01-28 | 冶金工业部长沙矿冶研究院 | Method for producing direct reduced iron |
| CN1038432C (en) * | 1995-07-21 | 1998-05-20 | 宝山钢铁(集团)公司 | Method of production for direct reduction furnace charge by cold-consolidation briquetting method |
| CN102534202A (en) * | 2012-01-31 | 2012-07-04 | 安徽朗斯特复合材料科技有限公司 | Method for producing bulk manganese ore furnace charge |
| CN102851491A (en) * | 2012-08-06 | 2013-01-02 | 莱芜钢铁集团有限公司 | Red mud composite binder for oxidized pellets |
| CN103100719B (en) * | 2012-11-12 | 2015-12-09 | 柳州百韧特先进材料有限公司 | A kind of technological process of producing zinc powder |
| CN103100719A (en) * | 2012-11-12 | 2013-05-15 | 柳州百韧特先进材料有限公司 | Technological process for producing zinc powder |
| CN103898318A (en) * | 2012-12-31 | 2014-07-02 | 攀钢集团研究院有限公司 | Pelletizing method, pellet ore fresh pellet and pellet ore |
| CN103898318B (en) * | 2012-12-31 | 2016-12-28 | 攀钢集团研究院有限公司 | A kind of method of pelletizing and a kind of pellet raw ball and pellet |
| CN104164560A (en) * | 2014-08-28 | 2014-11-26 | 中南大学 | Sodium humate adhesive solution for iron ore pellets as well as preparation method and application of sodium humate adhesive solution |
| CN104164559A (en) * | 2014-08-28 | 2014-11-26 | 中南大学 | Method for improving pelletizability of low-pelletizability iron concentrate |
| CN104164559B (en) * | 2014-08-28 | 2016-11-30 | 中南大学 | A kind of method improving difficult pelletizing iron ore concentrate balling-up |
| CN110155970A (en) * | 2019-06-12 | 2019-08-23 | 攀枝花学院 | Phosphorus ore micro mist pelletizing and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1003307B (en) | 1989-02-15 |
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