CN102162018A - Iron making method by rotary hearth furnace direct reduction-grinding and separation treatment of high-phosphorus oolitic hematite - Google Patents
Iron making method by rotary hearth furnace direct reduction-grinding and separation treatment of high-phosphorus oolitic hematite Download PDFInfo
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- CN102162018A CN102162018A CN 201110139060 CN201110139060A CN102162018A CN 102162018 A CN102162018 A CN 102162018A CN 201110139060 CN201110139060 CN 201110139060 CN 201110139060 A CN201110139060 A CN 201110139060A CN 102162018 A CN102162018 A CN 102162018A
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Abstract
The invention discloses an iron making method by rotary hearth furnace direct reduction-grinding and separation treatment of high-phosphorus oolitic hematite. The iron making method comprises the following steps of: firstly, mixing given amounts of coal, iron ore and dephosphorizing agent, granulating, drying, laying green balls into a rotary hearth furnace, heating to 1100 DEG C-1350 DEG C, keeping for 25-40 minutes, then directly delivering high-temperature reduction iron charge of 600 DEG C-1100 DEG C into water for cooling, finely grinding and separating, drying the iron charge by high-temperature oxygen-free waste gas after fine grinding and separation, and agglomerating to form lump iron charge. The method has a simple process, short flow, high efficiency and no need of coking coal, and is suitable for treating the high-phosphorus oolitic hematite.
Description
Technical field
The present invention relates to a kind of direct reduction iron making method of smelting iron and steel technology, relate in particular to the iron smelting method that high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of a kind of rotary hearth furnace.
Background technology
Along with the progress and the expanding economy of society, to the also increase day by day of demand of iron ore.The price of iron ore is in continuous rise in recent years, and this just makes some think originally that relative lean ore and the reluctant iron ore that can not exploit utilization had had the value of development and use.High-phosphor oolitic hematite wherein is exactly a typical representative.But it is for a long time always because be difficult to sort and phosphorus grade wherein is difficult to reduce and can not get good development and use.
In the prior art, the high-phosphor oolitic hematite majority all adopts tunnel furnace to carry out small-scale production, though also can reach technical indicator preferably, but, owing to yield poorly, energy consumption is higher, and is seriously polluted, expressly forbidden, and conventional beneficiation method is powerless to this kind sample ore by many countries.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can be applicable to the iron smelting method that utilizes the direct reduction-grinding choosing of the rotary hearth furnace of iron in the high-phosphor oolitic hematite to handle high-phosphor oolitic hematite.
The objective of the invention is to be achieved through the following technical solutions:
The iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace of the present invention, comprises step:
At first, prepare burden, following raw material prepared burden by weight:
Coal: 10～30 parts; High-phosphor oolitic hematite: 70～80 parts; Dephosphorizing agent: 0～20 part;
Then, make ball after above-mentioned three kinds of raw materials are mixed, after the drying green-ball is distributed in the rotary hearth furnace, be heated to 1100 ℃～1350 ℃, keep after 15～40 minutes, discharge the high temperature reduction iron charge from rotary hearth furnace;
Afterwards, grind choosing after described high temperature reduction iron charge directly sent in the water cooling, and will grind the iron charge agglomeration after selecting, form block iron charge.
As seen from the above technical solution provided by the invention, the iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace of the present invention, because with 10～30 parts in coal, 70～80 parts of high-phosphor oolitic hematites, 0～20 part of mixed pelletizing of dephosphorizing agent, and in rotary hearth furnace 1100 ℃～1350 ℃ smelt; Afterwards, by mill choosing, agglomeration, form block iron charge.Can carry out direct reduction iron making to the iron content high-phosphor oolitic hematite.
Description of drawings
Fig. 1 is the process flow sheet that the iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace of the present invention.
Embodiment
The iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace of the present invention, and its preferable embodiment comprises step as shown in Figure 1:
At first carrying out raw material prepares:
Coal: can select various non-coking coal.
High-phosphor oolitic hematite: be applicable to high-phosphor oolitic hematite iron grade 30～65%, can handle the high-phosphor oolitic hematite of iron content 30～65%, sulfur-bearing 0.3～4%.
Dephosphorizing agent: one or more that can select unslaked lime, Wingdale, lime carbonate, yellow soda ash, sodium sulfate, fluorite for use are as dephosphorizing agent.Also can select for use other raw material to do dephosphorizing agent.
Above-mentioned three kinds of raw materials are mixed by following weight part:
Coal: 10～30 parts;
High-phosphor oolitic hematite: 70～80 parts;
Dephosphorizing agent: 0～20 part.
Concrete method for refining is:
Make ball after by above-mentioned weight part three kinds of raw materials being mixed, after the drying green-ball is distributed into the heat accumulating type coal-based direct reduction iron rotary hearth furnace,, kept 15～40 minutes, discharge the high temperature reduction iron charge from rotary hearth furnace rotary hearth furnace internal heating to 1100 ℃～1350 ℃.Rotary hearth furnace fuel used can for calorific value between 750kcal/Nm
3～9000kcal/Nm
3All fuel.Can directly revert to degree of metalization and be 80%～95% reduction iron charge.
600 ℃～1100 ℃ the high temperature reduction iron charge of discharging from rotary hearth furnace is directly sent into the water and is ground choosing after the cooling, at first adopts wet-type ball mill or rod mill to carry out ore grinding, adopts magnetic separator to sort at last.
Iron charge after the mill choosing adopts pair roller type high pressure ball press or miscellaneous equipment agglomeration, forms block iron charge.
Specific embodiment:
High-phosphor oolitic hematite with somewhere iron content 41.02% phosphorous 0.81%, according to high-phosphor oolitic hematite: coal: after the mixed of Wingdale=100: 35: 15, pack into rotary hearth furnace through 35 minutes roasting after, immerse in the water immediately and cool off, after the crushing-magnetic selection agglomeration, obtain iron content 91.32%, phosphorous 0.07% the direct-reduced iron piece, the recovery rate of iron is 90.34% in the high-phosphor oolitic hematite.One ton of iron block of every production consumes 2.37 tons of high-phosphor oolitic hematites, 0.35 ton in Wingdale, 0.6 ton of fuel, electric 300kwh.
Among the present invention, utilize the high temperature reduction process of rotary hearth furnace, the iron in the high-phosphor oolitic hematite is reduced,, make the iron monomer dissociation through wet grinding again after Quench utilizes the iron crystalline substance to make the combination of the two loosening with the different of the gangue coefficient of expansion; Utilize the oxygen loss high-temp waste gas to make moisture metal iron block oven dry and agglomeration, prevent that metallic iron from reoxidizing; By with addition of Wingdale, carry out harmful element phosphorus fixed and separation, not only reduced the harmful element in the finished product, and guaranteed that the influence of environmental pollution reach the required standards in the production process.Required fuel of whole technological process and power can all come from non-coking coal, realize steel smelting procedure substituting the rare energy.
Method of the present invention is compared with other iron smelting method operational paths of handling high-phosphor oolitic hematites, and its equipment is few, less investment, technology are simple, easy handling, flow process is short, efficient is high, cost is low, be easy to scale production, and very high practical value is arranged.Adopting the present invention, saved the heavy-polluted sintering of traditional technology, coking process, replaced the coke of scarcity of resources with non-coking coal, is a kind of non-blast furnace ironmaking method.The present invention can rationally utilize the natural resources and the energy to greatest extent, is a kind of high-efficiency environment friendly technology of utilizing high-phosphor oolitic hematite to smelt iron.
Claims (6)
1. the iron smelting method of the direct reduction-grinding choosing of a rotary hearth furnace processing high-phosphor oolitic hematite is characterized in that, comprises step:
At first, prepare burden, following raw material prepared burden by weight:
Coal: 10～30 parts; High-phosphor oolitic hematite: 70～80 parts; Dephosphorizing agent: 0～20 part;
Then, make ball after above-mentioned three kinds of raw materials are mixed, after the drying green-ball of being made is distributed in the rotary hearth furnace, be heated to 1100 ℃～1350 ℃, keep after 15～40 minutes, discharge the high temperature reduction iron charge from rotary hearth furnace;
Afterwards, grind choosing after described high temperature reduction iron charge directly sent in the water cooling, and will grind the iron charge agglomeration after selecting, form block iron charge.
2. the iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace according to claim 1, it is characterized in that the temperature of described high temperature reduction iron charge is 600 ℃～1100 ℃.
3. the iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace according to claim 1, it is characterized in that described high-phosphor oolitic hematite iron content 30～65%, sulfur-bearing 0.3～4%;
Described coal is a non-coking coal;
Described dephosphorizing agent is one or more in unslaked lime, Wingdale, lime carbonate, yellow soda ash, sodium sulfate, the fluorite.
4. the iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace according to claim 1, it is characterized in that described rotary hearth furnace is the direct-reduced iron rotary hearth furnace, and the fuel used calorific value of this rotary hearth furnace is 750kcal/Nm
3～9000kcal/Nm
3
5. the iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace according to claim 1, it is characterized in that, described mill choosing comprises:
Adopt wet-type ball mill or rod mill to carry out one section or two stage grinding, adopt magnetic separator to carry out one section or two sections then and sort.
6. the iron smelting method of high-phosphor oolitic hematite is handled in the direct reduction-grinding choosing of rotary hearth furnace according to claim 1, it is characterized in that the method for described agglomeration comprises: adopt the agglomeration of pair roller type high pressure ball press.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424874A (en) * | 2011-12-05 | 2012-04-25 | 武汉科技大学 | Oolitic hematite aluminum and iron separation method |
| CN102559976A (en) * | 2011-12-20 | 2012-07-11 | 沈阳博联特熔融还原科技有限公司 | Preparing method for direct reduced iron using low grade high phosphorus iron ore as raw materials |
| CN102634621A (en) * | 2012-04-09 | 2012-08-15 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
| CN102978318A (en) * | 2012-12-12 | 2013-03-20 | 北京科技大学 | Method for realizing phosphorus removal of oolitic high-phosphorus iron ores by combining enhanced gas-based reduction and high-temperature smelting separation |
| CN103014213A (en) * | 2012-12-26 | 2013-04-03 | 东北大学 | Method for reducing carbonate-containing iron ore to extract iron |
| WO2013152486A1 (en) * | 2012-04-09 | 2013-10-17 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
| CN104099465A (en) * | 2014-07-25 | 2014-10-15 | 北京科技大学 | Method for producing reduced iron power by self-catalysis reduction of high-phosphorus oolitic hematite |
| CN104212929A (en) * | 2014-08-19 | 2014-12-17 | 北京神雾环境能源科技集团股份有限公司 | Iron making method for treating high-phosphorus ore through direct reduction of gas-based shaft furnace and magnetic separation |
| CN104404245A (en) * | 2014-11-19 | 2015-03-11 | 武汉钢铁(集团)公司 | Method for producing abrasion-resistant material by utilizing high-phosphorus oolitic hematite |
| CN104651563A (en) * | 2015-02-13 | 2015-05-27 | 唐竹胜 | Combined method for extracting iron and dephosphorizing by reducing, smelting and dressing low-grade high-phosphorus hard-dressing iron (manganese) ore |
| CN105463146A (en) * | 2015-12-24 | 2016-04-06 | 钢研晟华工程技术有限公司 | Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron |
| CN105506209A (en) * | 2015-12-24 | 2016-04-20 | 钢研晟华工程技术有限公司 | Method for producing granular iron via direct reduction of high-phosphorus oolitic hematite by utilizing rotary hearth furnace |
| CN105861815A (en) * | 2016-06-08 | 2016-08-17 | 江苏省冶金设计院有限公司 | Dephosphorization iron-increasing method for high-phosphorus iron ore |
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| CN101386896A (en) * | 2008-09-24 | 2009-03-18 | 吴道洪 | Ore coal, melting ironmaking method after direct reduction-flotation-agglomeration |
| CN101487068A (en) * | 2009-03-03 | 2009-07-22 | 北京科技大学 | Technological process for directly producing spongy iron from high-phosphor oolitic hematite |
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| CN1904080A (en) * | 2006-08-10 | 2007-01-31 | 武汉科技大学 | Dephosphorus iron extraction production method of oolitic high phosphorus red iron ore |
| CN101386896A (en) * | 2008-09-24 | 2009-03-18 | 吴道洪 | Ore coal, melting ironmaking method after direct reduction-flotation-agglomeration |
| CN101487068A (en) * | 2009-03-03 | 2009-07-22 | 北京科技大学 | Technological process for directly producing spongy iron from high-phosphor oolitic hematite |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424874A (en) * | 2011-12-05 | 2012-04-25 | 武汉科技大学 | Oolitic hematite aluminum and iron separation method |
| CN102559976A (en) * | 2011-12-20 | 2012-07-11 | 沈阳博联特熔融还原科技有限公司 | Preparing method for direct reduced iron using low grade high phosphorus iron ore as raw materials |
| CN102559976B (en) * | 2011-12-20 | 2015-11-25 | 辽宁博联特冶金科技有限公司 | A kind of with the method for low-grade high-phosphorus iron ore for waste direct-reduced iron |
| CN102634621A (en) * | 2012-04-09 | 2012-08-15 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
| WO2013152486A1 (en) * | 2012-04-09 | 2013-10-17 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
| CN102978318A (en) * | 2012-12-12 | 2013-03-20 | 北京科技大学 | Method for realizing phosphorus removal of oolitic high-phosphorus iron ores by combining enhanced gas-based reduction and high-temperature smelting separation |
| CN103014213A (en) * | 2012-12-26 | 2013-04-03 | 东北大学 | Method for reducing carbonate-containing iron ore to extract iron |
| CN104099465B (en) * | 2014-07-25 | 2016-05-25 | 北京科技大学 | A kind of high-phosphor oolitic hematite self catalyzed reduction is produced the method for high-purity reduced iron powder |
| CN104099465A (en) * | 2014-07-25 | 2014-10-15 | 北京科技大学 | Method for producing reduced iron power by self-catalysis reduction of high-phosphorus oolitic hematite |
| CN104212929A (en) * | 2014-08-19 | 2014-12-17 | 北京神雾环境能源科技集团股份有限公司 | Iron making method for treating high-phosphorus ore through direct reduction of gas-based shaft furnace and magnetic separation |
| CN104212929B (en) * | 2014-08-19 | 2016-06-22 | 北京神雾环境能源科技集团股份有限公司 | The iron smelting method of gas-based shaft kiln directly reduced-magnetic separation separating treatment height phosphorus ore |
| CN104404245A (en) * | 2014-11-19 | 2015-03-11 | 武汉钢铁(集团)公司 | Method for producing abrasion-resistant material by utilizing high-phosphorus oolitic hematite |
| CN104404245B (en) * | 2014-11-19 | 2016-10-05 | 武汉钢铁(集团)公司 | A kind of method utilizing high-phosphor oolitic hematite to produce high-abrasive material |
| CN104651563A (en) * | 2015-02-13 | 2015-05-27 | 唐竹胜 | Combined method for extracting iron and dephosphorizing by reducing, smelting and dressing low-grade high-phosphorus hard-dressing iron (manganese) ore |
| CN104651563B (en) * | 2015-02-13 | 2016-08-17 | 唐竹胜 | A kind of low lean high phosphorus difficulty selects ferrum/Reduction of manganese ore smelting choosing to combine the method carrying ferrum dephosphorization |
| CN105506209A (en) * | 2015-12-24 | 2016-04-20 | 钢研晟华工程技术有限公司 | Method for producing granular iron via direct reduction of high-phosphorus oolitic hematite by utilizing rotary hearth furnace |
| CN105463146A (en) * | 2015-12-24 | 2016-04-06 | 钢研晟华工程技术有限公司 | Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron |
| CN105861815A (en) * | 2016-06-08 | 2016-08-17 | 江苏省冶金设计院有限公司 | Dephosphorization iron-increasing method for high-phosphorus iron ore |
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