CN104046780A - Blast-furnace smelting technique of low-sulfur low-manganese high-iron rich-manganese slag - Google Patents
Blast-furnace smelting technique of low-sulfur low-manganese high-iron rich-manganese slag Download PDFInfo
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- CN104046780A CN104046780A CN201410308539.3A CN201410308539A CN104046780A CN 104046780 A CN104046780 A CN 104046780A CN 201410308539 A CN201410308539 A CN 201410308539A CN 104046780 A CN104046780 A CN 104046780A
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Abstract
The invention relates to a smelting technique of high-iron high-phosphorus refractory deficient-manganese ores, particularly a blast-furnace smelting technique of low-sulfur low-manganese high-iron rich-manganese slag. The technique is characterized by comprising the following steps: (1) mixing low-sulfur low-manganese high-iron rich-manganese slag, coke and dolomite in a weight ratio of 78:21:1, and adding the mixture into the blast furnace via the furnace roof; (2) sending hot coal gas and hot air from a hot-blast furnace into the blast furnace via the furnace bottom to combust coke, thereby generating coal gas and releasing heat; and (3) while controlling the furnace temperature at 1250-1350 DEG C, carrying out selective reduction reaction in the blast furnace, and collecting the slag on the upper part of the furnace hearth, thereby obtaining the rich-manganese slag. The technique uses national abundant idle deficient-manganese ores and a certain proportion of imported high-manganese high-iron ores as raw materials, and regulates the operating parameters, operating system and operating means on the basis of the traditional rich-manganese slag smelting technique and pig iron smelting technique to form a novel smelting production technique of rich-manganese slag.
Description
Technical field
The present invention relates to high ferro, high phosphorus, difficulty and select the smelting technology of poor manganese ore stone, the blast furnace smelting process of the rich manganese slag of the low manganese high ferro of especially a kind of low-sulfur.
Background technology
Increase along with silicomanganese market demand, the demand of producing the rich manganese slag of the low-phosphorous low iron of one of required high quality raw material of silicomanganese also increases considerably, and because domestic manganese ore is in recent years exploited in a large number, can directly smelt that to produce the mineral of rich manganese slag fewer and feweri, in order to maintain production, can only rely on addition of a large amount of Imported Manganese Ores and make again production cost high.
But in China, there is again a large amount of unserviceable " slow-witted ore deposit " containing manganese 1-8%, iron content 20-40%: with ferrous manganese ore, see that manganese content is too low, without utility value; With iron ore, see, because mineral composition is complicated, for magnetite, rhombohedral iron ore, spathic iron ore mixed concomitant, cannot selectedly utilize.
Summary of the invention
The blast furnace smelting process that the object of this invention is to provide the rich manganese slag of the low manganese high ferro of a kind of low-sulfur, this technique can be take domestic a large amount of idle poor manganese ore, and to coordinate the high iron ore of the high manganese of a certain proportion of import be raw material, thereby production cost is significantly reduced.
A blast furnace smelting process for the rich manganese slag of the low manganese high ferro of low-sulfur, its special feature is, comprises the steps:
(1) after being mixed by the part by weight of 78:21:1, the rich manganese slag of the low manganese high ferro of low-sulfur, coke and rhombspar add blast furnace from furnace roof;
(2) heating gas of sending in hotblast stove and warm air are sent into blast furnace from furnace bottom, thereby make coke burning generate coal gas heat release;
(3) by Control for Kiln Temperature at 1250-1350 ℃, in blast furnace, carry out selective reduction reaction, the slag of then collecting cupola well top is rich manganese slag.
Wherein collect the coal gas generating in reaction process, after gravitational dust collection, bag-type dust, obtain purified gas, then send in hotblast stove and heat.
Wherein in the rich manganese slag of the low manganese high ferro of low-sulfur, contain manganese 1-8% and iron content 20-40%.
Technique of the present invention compared with prior art has following beneficial effect:
1. widened the use range of rich manganese slag melting raw materials for production: technique of the present invention be take domestic a large amount of idle poor manganese ore, and to coordinate the high iron ore of the high manganese of a certain proportion of import be raw material, take traditional rich manganese slag melting technique and pig iron smelting technique as basis, adjust operations parameter, operating duty, operational means, formed a kind of novel rich manganese slag melting production technique.
2. reduced the production cost of rich manganese slag: the comprehensive iron grade that the present invention because improved enters stove ore increases low manganese low-sulfur medium phosphoric iron output, added the poor manganese ore that a large amount of use costs are extremely low and rich manganese slag cost is significantly reduced.Owing to having taked corresponding operational means, not only guaranteed the direct motion of the working of a furnace, also guaranteed that the rate of recovery of manganese reaches more than 85% simultaneously.
3. improve slag iron separating effect, manganese, iron recovery have been improved: the present invention is owing to suitably improving the ternary basicity of rich manganese slag, not only changed slag phase structure, also improved the heat storage capacity of slag, thereby reduced the viscosity of rich manganese slag, improved the mobility of slag, greatly improved slag iron separating power, in slag, be with iron situation obviously to reduce, improved the quality of rich manganese slag.Owing to adopting the physics heat content of on purpose controlling ternary basicity and Fu Meng slag, the rate of recovery of manganese is greatly improved simultaneously.
4. improved the direct motion degree of the working of a furnace, reduced ratio of putting coke into furnace: the present invention adopts increase blast energy, enlivened cupola well, made furnace condition anterograde degree have large increase, changed in existing rich manganese slag melting technology because of cupola well easily pile up cause collapse, problem that material suspension phenomenon is many.And owing to improving the use range of hot blast temperature, supplemented in time because the amount of tapping a blast furnace is compared with the cupola well calorific loss producing greatly, under equal conditions, reduced the usage quantity of coke, reduced the production coke ratio of rich manganese slag hearth.6. reduced labor strength, labour productivity and security have been improved: the present invention is owing to having improved slag iron mobility and suitably having improved slag iron temperature, not only reduce workman's labour intensity, reduced site work personnel simultaneously, improved the security of labour productivity and workman's operation.
Accompanying drawing explanation
Accompanying drawing 1 is the rich manganese slag of the blast-furnace smelting process flow sheet of the embodiment of the present invention 1.
Embodiment:
The invention provides the rich manganese slag melting technique of the low manganese high ferro of a kind of low-sulfur, in tradition, smelt rich manganese slag and smelt on the basis of two kinds of production technique of the pig iron, for China, there is high ferro, high phosphorus, difficulty is selected the smelting technology technology of poor manganese ore stone independent research, can be by ore Mn/Fe between 0.4-0.7, and the ore that Mn+Fe reaches more than 38% carries out the enrichment smelting of manganese, changed traditional rich manganese slag melting requires the Mn/Fe of manganese ore to remain between 1.0-3.0 in raw materials quality, and Mn+Fe reaches the mode of production that more than 42% could smelt, also significantly reduce the packing phenomenon of material in cupola well, improved sweetening effectiveness, also can produce and reclaim low-sulfur low manganese hot metal, reclaim pig iron rate and to smelt the pig iron rate of tapping a blast furnace suitable, than traditional rich manganese slag melting, reclaim the pig iron and improved 3.5-4%, broken and smelted the tradition that rich manganese slag low manganese hot metal yields poorly, open up and widened China's high ferro, high phosphorus, difficulty is selected the Application Areas of poor manganese ore stone, and manganese content in molten iron is controlled at below 6%, manganese recovery ratio is higher than more than 85%.Make the rich manganese slag cost of ton decline 30% simultaneously, realized making full use of of resource.
1,, according to the high situation of the low iron of domestic poor manganese ore manganese, domestic manganese ore (Mn4-8%, Fe35%) and the high manganese high ferro of import (Mn30%, Fe24%) are prepared burden by 6:4.
2, aspect blowing system: dwindle original design air port incoming air area, to improve air blast flow velocity, increase blast energy, by 2900JS-1, bring up to 3050JS-1, further enliven furnace cylinder working state, reduced the rich manganese slag hearth of traditional smelting cylinder and easily piled junction phenomena, and laid the foundation for working of a furnace stable smooth operation.
3, aspect charging system: tradition is smelted rich manganese slag charging and conventionally adopted whole formal dress or upside-down mounting, and keeps low stockline.By groping summary, we adopt formal dress and upside-down mounting to feed in proportion, and center and peripheral two road Gas Flows in stove are developed entirely, and by normal stockline operation, coal gas heat energy and chemical energy are made good use of, and collapse material hanging few, and coke ratio declines to a great extent, working of a furnace stable smooth operation.
4, aspect slagging regime: tradition is smelted rich manganese slag and adopted natural alkalinity, cupola well heat storage capacity is poor, the bad control of temperature, the separation of slag iron is bad, cupola well is easily piled up, and the rate of recovery of manganese and iron is all lower, and in molten iron, manganese content is generally at 6%--10%, manganese recovery ratio is at 80%--85%, and the low manganese high-sulfur of the byproduct of producing phosphoric pig iron output is extremely low.By summary, improve, for rich manganese slag hearth, enter the comprehensive grade of stove manganese ore iron content and smelt rich manganese slag requirement ferrous grade far above tradition, by with addition of some amount flux, rich manganese slag ternary basicity maintains 0.35--0.4 left and right, improved cupola well heat storage capacity, temperature of the furnace hearth is suitable, slag iron mobility and separate condition are good, hearth accumulation phenomenon reduces, manganese and iron recovery improve greatly, and owing to having increased the CaO+MgO content of slag, improved slag desulfurization capacity, produce low-sulfur low manganese hot metal, pig iron output significantly improves, broken and smelted the tradition that rich manganese slag low manganese hot metal yields poorly.The interior manganese content of molten iron is controlled at below 4.5%, phosphorus content is less than 0.15%, and sulphur content is less than 0.03%, and manganese recovery ratio is higher than more than 85%.Take full advantage of the high iron ore of domestic low manganese, slag iron compares between 1.50--2.0, remarkable in economical benefits.
5, aspect thermal system: tradition is smelted rich manganese slag wind-warm syndrome generally 800 ℃ of left and right, and coke load is lower, and the capacity factor of a blast furnace is low, and coal gas utilizes bad, and coke ratio is higher, and temperature of the furnace hearth is wayward.By summing up experience, wind-warm syndrome is progressively brought up to more than 1000 ℃ by the blow-on initial stage more than 800 ℃, cohesive zone progressively moves down, furnace temperature is relatively stable, due to the raising of hot blast temperature, makes into the corresponding minimizing of oven coke quantity simultaneously, alleviated and entered stove sulphur load and waste residue amount, make the content of sulphur, silicon in the content of iron, phosphorus in rich manganese slag and the byproduct pig iron meet national standard, more make the direct motion of rich manganese slag conditions of blast furnace, coke ratio significantly reduces.
Embodiment 1:
(1) after being mixed by the part by weight of 78:21:1, the rich manganese slag of the low manganese high ferro of low-sulfur, coke and rhombspar add blast furnace from furnace roof;
(2) heating gas of sending in hotblast stove and warm air are sent into blast furnace from furnace bottom, thereby make coke burning generate coal gas heat release;
(3) by Control for Kiln Temperature at 1250-1350 ℃, in blast furnace, carry out selective reduction reaction, the slag of then collecting cupola well top is rich manganese slag.
Traditional technology and the present embodiment 1 operation are compared:
The process of the rich manganese slag of blast-furnace smelting is exactly the enrichment process of manganese in slag.Its ultimate principle is selective reduction, according to different reducing properties such as manganese, iron, phosphorus, carries out selective reduction,, when elements such as guaranteeing iron, phosphorus fully reduces, suppresses the reduction of manganese.In fact, namely in thering is the blast furnace of strongly reducing atmosphere, iron, phosphorus is separated with manganese, allow the oxide compounds such as the iron of easy reduction and phosphorus preferentially be reduced into metal and to be deposited in bottom cupola well, the value Mn Reduction of Oxide of difficult reduction is suboxide (MnO
2→ Mn
2o
3→ Mn
3o
4→ MnO), and with the form of MnO enter in slag and become floating the amassing on cupola well top of high manganese slag of low-phosphorous low iron.Because the reduction temperature of iron and manganese is different, adopt the method for selective reduction can make manganese in blast furnace, reach separated object.
Claims (3)
1. a blast furnace smelting process for the rich manganese slag of the low manganese high ferro of low-sulfur, is characterized in that, comprises the steps:
(1) after being mixed by the part by weight of 78:21:1, the rich manganese slag of the low manganese high ferro of low-sulfur, coke and rhombspar add blast furnace from furnace roof;
(2) heating gas of sending in hotblast stove and warm air are sent into blast furnace from furnace bottom, thereby make coke burning generate coal gas heat release;
(3) by Control for Kiln Temperature at 1250-1350 ℃, in blast furnace, carry out selective reduction reaction, the slag of then collecting cupola well top is rich manganese slag.
2. the blast furnace smelting process of the rich manganese slag of the low manganese high ferro of a kind of low-sulfur as claimed in claim 1, is characterized in that: wherein collect the coal gas generating in reaction process, obtain purified gas, then send in hotblast stove and heat after gravitational dust collection, bag-type dust.
3. the blast furnace smelting process of the rich manganese slag of the low manganese high ferro of a kind of low-sulfur as claimed in claim 1, is characterized in that: wherein in the rich manganese slag of the low manganese high ferro of low-sulfur, contain manganese 1-8% and iron content 20-40%.
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| CN201410308539.3A CN104046780A (en) | 2014-07-01 | 2014-07-01 | Blast-furnace smelting technique of low-sulfur low-manganese high-iron rich-manganese slag |
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| CN201410308539.3A CN104046780A (en) | 2014-07-01 | 2014-07-01 | Blast-furnace smelting technique of low-sulfur low-manganese high-iron rich-manganese slag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111100981A (en) * | 2019-12-27 | 2020-05-05 | 宁夏晟晏实业集团能源循环经济有限公司 | Method for improving metallurgical performance of manganese-rich slag smelted manganese sinter |
| CN113930561A (en) * | 2021-10-19 | 2022-01-14 | 宁夏顺艾瑞工贸有限公司 | Method for smelting manganese-rich slag by using silicon carbide waste slag and manganese-rich slag |
-
2014
- 2014-07-01 CN CN201410308539.3A patent/CN104046780A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 丁楷如等: "《锰矿开发与加工技术》", 31 July 1992, 湖南科学技术出版社 * |
| 谭柱中等: "《锰冶金学》", 30 September 2004, 中南大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111100981A (en) * | 2019-12-27 | 2020-05-05 | 宁夏晟晏实业集团能源循环经济有限公司 | Method for improving metallurgical performance of manganese-rich slag smelted manganese sinter |
| CN111100981B (en) * | 2019-12-27 | 2021-11-02 | 宁夏晟晏实业集团能源循环经济有限公司 | Method for improving metallurgical performance of manganese-rich slag smelted manganese sinter |
| CN113930561A (en) * | 2021-10-19 | 2022-01-14 | 宁夏顺艾瑞工贸有限公司 | Method for smelting manganese-rich slag by using silicon carbide waste slag and manganese-rich slag |
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Application publication date: 20140917 |