CN101906499A - Iron-making method for treating sulfate slag by direct reduction, grinding and sorting - Google Patents
Iron-making method for treating sulfate slag by direct reduction, grinding and sorting Download PDFInfo
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- CN101906499A CN101906499A CN2009100865250A CN200910086525A CN101906499A CN 101906499 A CN101906499 A CN 101906499A CN 2009100865250 A CN2009100865250 A CN 2009100865250A CN 200910086525 A CN200910086525 A CN 200910086525A CN 101906499 A CN101906499 A CN 101906499A
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- sulfate slag
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Abstract
The invention discloses an iron-making method for treating sulfate slag by direct reduction, grinding and sorting. The method comprises the following steps of: mixing a certain amount of coal, iron ore and flux, balling and drying the mixture, transferring the raw balls into a rotary hearth furnace, heating the raw balls to between 1,100 and 1,350 DEG C, keeping the temperature for 15 to 40 minutes, then directly conveying the high-temperature reductive iron material of 600 to 1,100 DEG C to water for cooling, then grinding and sorting the iron material, drying the ground and sorted iron material by using high-temperature anoxic waste gas, and agglomerating the iron material to form a bulk iron material. The method has the advantages of simple process, short flow, high efficiency, no need of coking coal and suitability for treating the sulfate slag.
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 sulfate slag is handled in a kind of direct reduction-grinding choosing.
Background technology
Blast furnace iron-making method is an ironmaking technology commonly used in the prior art.But powerless to the probe into Processing high Iron and Sulfur acid sludge behind the employing sulfurous iron ore production sulfuric acid in the prior art, most sulfate slags are stored up as waste residue, take a large amount of land resourcess, serious environment pollution.
Mineral in the sulfate slag belong to artificial mineral, all with natural mineral very big difference are arranged on profile still is physical and chemical performance.Owing to reasons such as its characteristic and detrimental impurity content height, no matter be to adopt gravity treatment, flotation, magnetic separation, magnetizing roasting, the technical indicator of every ore dressing all is difficult to satisfy the requirement of conventional blast furnace materials.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can be applicable to that the direct reduction-grinding choosing that utilizes iron in the sulfate slag handles the iron smelting method of sulfate slag.
The objective of the invention is to be achieved through the following technical solutions:
The iron smelting method of sulfate slag is handled in direct reduction-grinding choosing of the present invention, comprises step:
At first, prepare burden, following raw material prepared burden by weight:
Coal: 10～30 parts; Sulfate slag: 70～80 parts; Flux: 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 sulfate slag is handled in direct reduction-grinding choosing of the present invention, because with 10～30 parts in coal, 70～80 parts of sulfate slags, 0～20 part of mixed pelletizing of flux, 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 probe into Processing high Iron and Sulfur acid sludge.
Description of drawings
Fig. 1 is the process flow sheet that the iron smelting method of sulfate slag is handled in direct reduction-grinding choosing of the present invention.
Embodiment
The iron smelting method of sulfate slag is handled in direct reduction-grinding choosing 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.
Sulfate slag: be applicable to sulfate slag iron grade 20～65%.
Flux: can select for use in Wingdale, magnesium limestone, the rhombspar one or more as flux.Also can select for use other raw material to make solvent.
Above-mentioned three kinds of raw materials are mixed by following weight part:
Coal: 10～30 parts;
Sulfate slag: 70～80 parts;
Flux: 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 is fuel used can be calorific value all fuel between 750kcal/Nm3～9000kcal/Nm3.Can directly revert to degree of metalization and be 80%～95% reduction iron charge.
600 ℃～1000 ℃ 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:
Sulfate slag with somewhere iron content 55% sulfur-bearing 2%, according to sulfate slag: coal: after the mixed of Wingdale=100: 20: 15, pack into rotary hearth furnace through 30 minutes roasting after, immerse in the water immediately and cool off, after the crushing-magnetic selection agglomeration, obtain iron content 92%, sulfur-bearing 0.05% the direct-reduced iron piece, the recovery rate of iron is 90% in the sulfate slag.One ton of iron block of every production consumes 2 tons of sulfate slags, 0.3 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 sulfate slag is reduced,, resolve 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 metallic iron flash baking and agglomeration, prevent that metallic iron from reoxidizing; By with addition of flux such as Wingdales, carry out harmful element 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 sulfate slags, 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 sulfate slag to smelt iron.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (6)
1. the iron smelting method of a direct reduction-grinding choosing processing sulfate slag is characterized in that, comprises step:
At first, prepare burden, following raw material prepared burden by weight:
Coal: 10～30 parts; Sulfate slag: 70～80 parts; Flux: 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.
2. the iron smelting method of sulfate slag is handled in direct reduction-grinding choosing 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 sulfate slag is handled in direct reduction-grinding choosing according to claim 1, it is characterized in that described sulfate slag iron content 20～65%, sulfur-bearing 0.3～4%;
Described coal is a non-coking coal;
Described flux is one or more in lime, Wingdale, magnesium limestone, the rhombspar.
4. the iron smelting method of sulfate slag is handled in direct reduction-grinding choosing 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 sulfate slag is handled in direct reduction-grinding choosing according to claim 1, it is characterized in that, described mill choosing comprises:
At first adopt wet-type ball mill or rod mill ore grinding, adopt magnetic separator to sort then.
6. the iron smelting method of sulfate slag is handled in direct reduction-grinding choosing according to claim 1, it is characterized in that described agglomeration method comprises: adopt the agglomeration of pair roller type high pressure ball press.
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| CN2009100865250A CN101906499A (en) | 2009-06-04 | 2009-06-04 | Iron-making method for treating sulfate slag by direct reduction, grinding and sorting |
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| CN2009100865250A CN101906499A (en) | 2009-06-04 | 2009-06-04 | Iron-making method for treating sulfate slag by direct reduction, grinding and sorting |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191349A (en) * | 2011-05-03 | 2011-09-21 | 朱胜 | Method for preparing iron powder by directly utilizing high temperature sulfuric acid slag at outlet of boiling furnace |
| CN102212636A (en) * | 2011-05-26 | 2011-10-12 | 吴道洪 | Iron-making method by performing coal-based direct reduction in rotary hearth furnace and melting in gas melting furnace on lateritic-nickel ore |
| CN102796839A (en) * | 2012-08-28 | 2012-11-28 | 北京科技大学 | Technique for producing direct reduced iron and synchronously performing desulfurization through reduction roasting of sulfate slag |
| CN102808057A (en) * | 2011-05-30 | 2012-12-05 | 温向阳 | Coal base direct reduction iron process of external heating horizontal channel type furnace |
| CN103305701A (en) * | 2013-07-02 | 2013-09-18 | 北京神雾环境能源科技集团股份有限公司 | Comprehensive recovery method of sulfuric-acid residue containing gold and silver |
| CN106350630A (en) * | 2016-11-22 | 2017-01-25 | 江苏省冶金设计院有限公司 | System and method for processing iron pyrite by fuel gas melting separation furnace |
| CN106381357A (en) * | 2016-11-22 | 2017-02-08 | 江苏省冶金设计院有限公司 | System and method for treating siderites by using rotary hearth furnace |
-
2009
- 2009-06-04 CN CN2009100865250A patent/CN101906499A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191349A (en) * | 2011-05-03 | 2011-09-21 | 朱胜 | Method for preparing iron powder by directly utilizing high temperature sulfuric acid slag at outlet of boiling furnace |
| CN102212636A (en) * | 2011-05-26 | 2011-10-12 | 吴道洪 | Iron-making method by performing coal-based direct reduction in rotary hearth furnace and melting in gas melting furnace on lateritic-nickel ore |
| CN102808057A (en) * | 2011-05-30 | 2012-12-05 | 温向阳 | Coal base direct reduction iron process of external heating horizontal channel type furnace |
| CN102796839A (en) * | 2012-08-28 | 2012-11-28 | 北京科技大学 | Technique for producing direct reduced iron and synchronously performing desulfurization through reduction roasting of sulfate slag |
| CN103305701A (en) * | 2013-07-02 | 2013-09-18 | 北京神雾环境能源科技集团股份有限公司 | Comprehensive recovery method of sulfuric-acid residue containing gold and silver |
| CN103305701B (en) * | 2013-07-02 | 2015-01-21 | 北京神雾环境能源科技集团股份有限公司 | Comprehensive recovery method of sulfuric-acid residue containing gold and silver |
| CN106350630A (en) * | 2016-11-22 | 2017-01-25 | 江苏省冶金设计院有限公司 | System and method for processing iron pyrite by fuel gas melting separation furnace |
| CN106381357A (en) * | 2016-11-22 | 2017-02-08 | 江苏省冶金设计院有限公司 | System and method for treating siderites by using rotary hearth furnace |
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