CN102230079A - Process for producing magnesia pellets by using chain grate machine rotary kiln - Google Patents
Process for producing magnesia pellets by using chain grate machine rotary kiln Download PDFInfo
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- CN102230079A CN102230079A CN 201010221750 CN201010221750A CN102230079A CN 102230079 A CN102230079 A CN 102230079A CN 201010221750 CN201010221750 CN 201010221750 CN 201010221750 A CN201010221750 A CN 201010221750A CN 102230079 A CN102230079 A CN 102230079A
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Abstract
The invention belongs to the technical field of crushing processes for processing metallurgical raw material ores, in particular relates to a process for producing magnesia pellets by using a chain grate machine rotary kiln. The process comprises the following steps of: preparing for materials according to the following components in percentage by weight: 92-96 % of magnetite concentrate, 1.0-3.0 % of bentonite and 3.0-4.5 % of magnesite; uniformly mixing the materials; adding water to the materials so as to uniformly stir the materials; feeding the mixed material into a balling disc to be balled so that green balls are obtained; feeding screened standard green balls into a chain grate machine to be dried and preheated into preheated balls; feeding the preheated balls into the rotary kiln to be roasted into roasted balls; testing the properties of the roasted balls; and feeding the roasted balls into a circular cooler and cooling the roasted balls to obtain standard magnesia pellet ores, wherein the water content of the magnetite concentrate is 7.0-9.0 %, and the consumption of magnesite is that MgO is less than 2.5 %. According to the invention, the mixing ratio of the pellet ore in a blast furnace raw material can be increased, the charging grade can be increased, the furnace burden metallurgical property can be improved, the production capacity of an iron making blast furnace can be enhanced and higher economic benefits can be obtained in the iron making.
Description
Technical field
The invention belongs to the crushing process technical field of metallurgical raw material mineral processing, particularly relate to a kind of grate kiln and produce magnesia pelletizing process.
Background technology
Along with the increase of acidic oxidation pellet production capacity in the iron-smelting raw material of Iron And Steel Industry, the use proportioning of high basicity sinter and acidic pellet ore also changes in the blast furnace burden structure.In the face of Anshan iron and steel plant acidic pellet ore production capacity increases back blast furnace burden structure problem, research is under existing material condition, explore the feasibility of producing the fluxed pellets ore deposit, improve the content of pellet basicity and increase MgO, guaranteeing under the constant condition of the overall basicity index of iron-smelting blast furnace raw material, increase pellet and go into the stove proportion scale, improve and go into the stove grade, improve the furnace charge metallurgical performance.
Summary of the invention
The purpose of this invention is to provide a kind of grate kiln and produce magnesia pelletizing process, can improve the reduction degree of pellet, higher softening and melt temperature is arranged, can reduce the blast furnace coking, can improve furnace processor, improve the ironmaking technology economic target.
The objective of the invention is to realize by following technical proposals:
Grate kiln of the present invention is produced magnesia pelletizing process, it is characterized in that comprising the steps:
1) according to the weight percent of following component batching: magnetite concentrate 92～96%, wilkinite 1.0～3.0%, magnesite 3.0～4.5% with this batch mixes, adds water and stirs, and amount of water is so that compound is moistening is as the criterion,
2) moistening compound is sent into balling disk (-sc) and is made ball formation green-ball, and sieve out qualified green-ball,
3) feed drying grate and carry out forced air drying, exhausting drying, be preheated to pre-hot-bulb sieving out qualified green-ball, test the performance of this pre-hot-bulb,
4) pre-hot-bulb is fed rotary kiln baking and becomes the roasting ball, test the performance of this roasting ball,
5) become qualified magnesia pellet after the roasting ball being sent into central cooler cooling,
Described magnetite concentrate moisture is 7.0～9.0%,
The consumption of described wagnerite is MgO＜2.5%.
Described bed thickness when moistening compound is sent into balling disk (-sc) is 150～250mm.
Described drying grate machine speed is 3.0～3.4m/min.
The temperature of described drying grate forced air drying is that 200～250 ℃, wind speed are 1.8～2.4m/s,
Described drying grate exhausting exsiccant temperature is 350～400 ℃, exhausting wind speed 1.8～2.1m/s.
920～960 ℃ of the temperature of described drying grate preheating, wind speed 2.4～2.7m/s.
The roasting condition of described rotary kiln baking is: 1250～1280 ℃ of maturing temperatures, roasting time 8～14min.
The performance of the pre-hot-bulb of described test comprises surveys ultimate compression strength, survey AC tumbler index, survey amount of powder.
The performance of described test roasting ball comprises surveys ultimate compression strength, survey barrate strength, survey abrasion resistance index.
The weight percent batching of described component is: magnetite concentrate 92～96%, wilkinite 1.0～3.0%, magnesite 3.0～4.5%, Wingdale 0.5～1.0%.
Producing the magnesia pellet that magnesia pelletizing process is produced according to grate kiln of the present invention, is exactly in the pellet batching, adds and contains a large amount of MgO fine grinding materials, such as wagnerite etc.Contain MgO fluxed pellets ore deposit higher reduction degree is arranged; Higher softening and melt temperature is arranged; Can reduce the blast furnace coking; Can improve furnace processor; Improve the ironmaking technology economic target.
By adding a spot of Wingdale, improve finished ball intensity.The pelletizing of Huo Deing with this understanding, its metallurgical performance is better, and reduction degree, reduction swellability performance and droplet temperature all are better than common pelletizing.
Because magnesia pellet ore reduction degree improves, and makes that the blast furnace indirect reduction rate is higher, reduced the heat that the flux fusion needs, reduced burnt (fuel) ratio; Because the narrower result of cohesive zone makes blast furnace productivity improve; Make when acid pellet is used in the cohesive zone position in the stove lowly, prolong life-span of refractory materials in the stove.
Produce magnesia pellet according to the present invention, can improve the proportioning of pellet, improve and go into the stove grade, improve the furnace charge metallurgical performance, improve the throughput of iron-smelting blast furnace, can make ironmaking obtain high economic benefit at blast furnace raw material.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment.
As shown in Figure 1, produce magnesia pelletizing process, it is characterized in that comprising the steps: according to grate kiln of the present invention
1) according to the weight percent of following component batching: magnetite concentrate 92～96%, wilkinite 1.0～3.0%, magnesite 3.0～4.5% with this batching mixing, adds water and stirs, and amount of water is so that compound is moistening is as the criterion,
2) moistening compound is sent into balling disk (-sc) and makes ball, form green-ball, and sieve out qualified green-ball,
3) feed drying grate drying, preheating with sieving out qualified green-ball, carry out forced air drying, exhausting drying, be preheated to pre-hot-bulb, test the performance of this pre-hot-bulb,
4) pre-hot-bulb is fed rotary kiln baking and becomes the roasting ball, test the performance of this roasting ball,
5) become the magnesia pellet of qualified finished product after the roasting ball being sent into central cooler cooling,
Described magnetite concentrate moisture is 7.0～9.0%,
The consumption of described wagnerite is MgO＜2.5%.
Described bed thickness when moistening compound is sent into balling disk (-sc) is 150～250mm.
Described drying grate machine speed is 3.0～3.4m/min.
The temperature of described drying grate forced air drying is that 200～250 ℃, wind speed are 1.8～2.4m/s,
Described drying grate exhausting exsiccant temperature is 350～400 ℃, exhausting wind speed 1.8～2.1m/s.
920～960 ℃ of the temperature of described drying grate preheating, wind speed 2.4～2.7m/s.
The roasting condition of described rotary kiln baking is: 1250～1280 ℃ of maturing temperatures, roasting time 8～14min.
The performance of the pre-hot-bulb of described test comprises surveys ultimate compression strength, survey AC tumbler index, survey amount of powder.
The performance of described test roasting ball comprises surveys ultimate compression strength, survey barrate strength, survey abrasion resistance index.
The weight percent batching of described component is: magnetite concentrate 92～96%, wilkinite 1.0～3.0%, magnesite 3.0～4.5%, Wingdale 0.5～1.0%.Owing to add the oxidation Wingdale, increased calcium oxide content, help improving basicity.
Produce magnesia pellet according to the present invention, can improve the proportioning of pellet, improve and go into the stove grade, improve the furnace charge metallurgical performance, improve the throughput of iron-smelting blast furnace, can make ironmaking obtain high economic benefit at blast furnace raw material.
Claims (10)
1. a grate kiln is produced magnesia pelletizing process, it is characterized in that comprising the steps:
1) according to the weight percent of following component batching: magnetite concentrate 92～96%, wilkinite 1.0～3.0%, magnesite 3.0～4.5% with this batching mixing, adds water and stirs, and amount of water is so that compound is moistening is as the criterion,
2) moistening compound is sent into balling disk (-sc) and is made ball formation green-ball, and sieve out qualified green-ball,
3) feed drying grate and carry out forced air drying, exhausting drying, be preheated to pre-hot-bulb sieving out qualified green-ball, test the performance of this pre-hot-bulb,
4) pre-hot-bulb is fed rotary kiln baking and becomes the roasting ball, test the performance of this roasting ball,
5) become qualified magnesia pellet after the roasting ball being sent into central cooler cooling,
Described magnetite concentrate moisture is 7.0～9.0%,
The consumption of described wagnerite is MgO＜2.5%.
2. grate kiln according to claim 1 is produced magnesia pelletizing process, it is characterized in that described bed thickness when moistening compound is sent into balling disk (-sc) is 150～250mm.
3. grate kiln according to claim 1 is produced magnesia pelletizing process, it is characterized in that described drying grate machine speed is 3.0～3.4m/min.
4. grate kiln according to claim 1 is produced magnesia pelletizing process, and the temperature that it is characterized in that described drying grate forced air drying is that 200～250 ℃, wind speed are 1.8～2.4m/s,
5. grate kiln according to claim 1 is produced magnesia pelletizing process, it is characterized in that described drying grate exhausting exsiccant temperature is 350～400 ℃, exhausting wind speed 1.8～2.1m/s.
6. grate kiln according to claim 1 is produced magnesia pelletizing process, it is characterized in that 920～960 ℃ of temperature, the wind speed 2.4～2.7m/s of described drying grate preheating.
7. grate kiln according to claim 1 is produced magnesia pelletizing process, it is characterized in that the roasting condition of described rotary kiln baking is: 1250～1280 ℃ of maturing temperatures, roasting time 8～14min.
8. grate kiln according to claim 1 is produced magnesia pelletizing process, it is characterized in that the performance of the pre-hot-bulb of described test comprises survey ultimate compression strength, surveys the AC tumbler index, surveys amount of powder.
9. grate kiln according to claim 1 is produced magnesia pelletizing process, it is characterized in that the performance of described test roasting ball comprises survey ultimate compression strength, surveys barrate strength, surveys abrasion resistance index.
10. grate kiln according to claim 1 is produced magnesia pelletizing process, the weight percent batching that it is characterized in that described component is: magnetite concentrate 92～96%, wilkinite 1.0～3.0%, magnesite 3.0～4.5%, Wingdale 0.5～1.0%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010221750 CN102230079A (en) | 2010-07-09 | 2010-07-09 | Process for producing magnesia pellets by using chain grate machine rotary kiln |
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| CN 201010221750 CN102230079A (en) | 2010-07-09 | 2010-07-09 | Process for producing magnesia pellets by using chain grate machine rotary kiln |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104263917A (en) * | 2014-09-19 | 2015-01-07 | 内蒙古包钢钢联股份有限公司 | Raw material and method for producing magnesium pellets by using belt type machine |
| CN110923443A (en) * | 2019-11-13 | 2020-03-27 | 鞍钢集团矿业有限公司 | Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof |
| CN111876591A (en) * | 2020-06-19 | 2020-11-03 | 太原钢铁(集团)有限公司 | Pellet production method for delaying rotary kiln accretion |
| CN113637843A (en) * | 2021-03-18 | 2021-11-12 | 许贵宾 | Method for producing composite flux pellet ore by grate rotary kiln |
| CN114763582A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste |
| CN114850174A (en) * | 2022-05-09 | 2022-08-05 | 天俱时工程科技集团有限公司 | Coupling process for solid waste treatment and preparation of chain-looping pellets |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0916742A1 (en) * | 1997-10-30 | 1999-05-19 | Kabushiki Kaisha Kobe Seiko Sho | Method of producing iron oxide pellets with low bentonite content |
| CN102102147A (en) * | 2009-12-17 | 2011-06-22 | 鞍钢集团矿业公司 | Process for producing magnesium pellet by grate rotary kiln |
-
2010
- 2010-07-09 CN CN 201010221750 patent/CN102230079A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0916742A1 (en) * | 1997-10-30 | 1999-05-19 | Kabushiki Kaisha Kobe Seiko Sho | Method of producing iron oxide pellets with low bentonite content |
| CN102102147A (en) * | 2009-12-17 | 2011-06-22 | 鞍钢集团矿业公司 | Process for producing magnesium pellet by grate rotary kiln |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104263917A (en) * | 2014-09-19 | 2015-01-07 | 内蒙古包钢钢联股份有限公司 | Raw material and method for producing magnesium pellets by using belt type machine |
| CN110923443A (en) * | 2019-11-13 | 2020-03-27 | 鞍钢集团矿业有限公司 | Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof |
| CN111876591A (en) * | 2020-06-19 | 2020-11-03 | 太原钢铁(集团)有限公司 | Pellet production method for delaying rotary kiln accretion |
| CN111876591B (en) * | 2020-06-19 | 2021-09-28 | 太原钢铁(集团)有限公司 | Pellet production method for delaying rotary kiln accretion |
| CN114763582A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste |
| CN114763582B (en) * | 2021-01-15 | 2023-09-12 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesia waste |
| CN113637843A (en) * | 2021-03-18 | 2021-11-12 | 许贵宾 | Method for producing composite flux pellet ore by grate rotary kiln |
| CN114850174A (en) * | 2022-05-09 | 2022-08-05 | 天俱时工程科技集团有限公司 | Coupling process for solid waste treatment and preparation of chain-looping pellets |
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Application publication date: 20111102 |