CN102191349A - Method for preparing iron powder by directly utilizing high temperature sulfuric acid slag at outlet of boiling furnace - Google Patents
Method for preparing iron powder by directly utilizing high temperature sulfuric acid slag at outlet of boiling furnace Download PDFInfo
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- CN102191349A CN102191349A CN2011101129302A CN201110112930A CN102191349A CN 102191349 A CN102191349 A CN 102191349A CN 2011101129302 A CN2011101129302 A CN 2011101129302A CN 201110112930 A CN201110112930 A CN 201110112930A CN 102191349 A CN102191349 A CN 102191349A
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Abstract
The invention relates to a method for recycling iron powder with sulfuric acid slag, in particular to a method for preparing iron powder by directly utilizing high temperature sulfuric acid slag at the outlet of a boiling furnace. The method is that the steps such as collecting, mixing, roasting, water cooling, ball milling, magnetic separation and drying are performed to obtain high-grade iron powder. The method effectively utilizes the waste heat of sulfuric acid slag to directly reduce sulfuric acid slag, thus sulfuric acid slag can be fully utilized, the waste heat of sulfuric acid slag can be fully utilized, the resource can be saved extremely and the environment can be protected. By adopting the method, the grade of iron can be increased to more than 92% and the recovery rate of iron is up to 95%.
Description
Technical field
The present invention relates to the method that a kind of sulfate slag reclaims iron powder, be specifically related to the method that a kind of high temperature sulfate slag that directly utilizes fluidizing furnace to export prepares iron powder.
Background technology
Progress of industry and development, more and more higher to the degree of dependence of Mineral resources, but Mineral resources are non-renewable, are important topics of current social development so effectively utilize existing Mineral resources.
Sulfurous iron ore is mainly used in the vitriolic industrial production.The iron ore deposit relative shortage of China, ferro-sulphur ore stores abundant, how to adopt new technology and technology in utilizing sulfurous iron ore in the element sulphur, the demand to iron and steel is the major objective of the friendly type social development of present resource environment to the comprehensive utilization iron resources in the modernization construction to satisfy.The annual production scale of China's production of sulfur from pyrite acid reaches about 2,000 ten thousand tons at present, and the amount of sulfate slag because the content of iron is low in the sulfate slag, can not be directly used in iron-making and steel-making industry also near 2,000 ten thousand tons simultaneously.Though there has been certain utilization in existing up to now a lot of enterprises to sulfate slag,, mostly low, deficiency in economic performance because of the rate of recovery, and caused a large amount of slag dumps to be abandoned, serious environment pollution; In addition, launching follow-up technology again after mostly adopting the high temperature sulfate slag that will come out from fluidizing furnace to cool off in the existing recovery technology reclaims, usually adopt the method for magnetic separation, but the rate of recovery is not high, what also have heats sulfate slag once more, carry out reducing roasting, whole process power consumption is bigger, serious waste of resources.
Summary of the invention
For solving prior art deficiency is arranged, the object of the present invention is to provide a kind of high temperature sulfate slag that directly utilizes fluidizing furnace to export to prepare the method for iron powder, effectively utilize the waste heat of sulfate slag, directly sulfate slag is reduced; Can make full use of sulfate slag, can make full use of the waste heat of sulfate slag again, economize on resources to greatest extent, the protection environment.
For achieving the above object, the technical solution adopted in the present invention is as follows:
A kind of high temperature sulfate slag that directly utilizes fluidizing furnace to export prepares the method for iron powder, may further comprise the steps:
A: collect fluidizing furnace outlet high temperature sulfate slag;
B: above-mentioned high temperature sulfate slag, coal and flux are mixed by following weight part: high temperature sulfate slag: 55-95 part; Coal: 5-35 part; Flux: 0-20 part obtains the high temperature compound;
C: above-mentioned high temperature compound is directly carried out reducing roasting, obtain reducing material;
D: with reducing material directly into water cooling;
E: cooled raw material through the ball milling ball milling, is obtained the ball milling material;
F: in magnetic separator after the magnetic separation, drying promptly obtains reduced iron powder with above-mentioned ball milling material.
Described high temperature sulfate slag mainly comprises Fe
2O
3And Fe
3O
4, wherein iron level accounts for the 20-69% of high temperature sulfate slag total mass by weight percentage, and other impurity comprises silicon, aluminium, sulphur, lead, zinc, phosphorus, arsenic, copper etc.
Flux of the present invention is one or more mixing in lime, Wingdale, magnesium limestone, the rhombspar.
Magnetic separator of the present invention is the Wet-type permanent magnet drum type magnetic separator, and the average magnetic induction density of tube table is 100～600mT.
The temperature of high temperature sulfate slag of the present invention is 300-1000 degree centigrade.
The ball milling method of ball mill of the present invention is the wet ball-milling mode.
The equipment that is adopted in the reducing roasting of the present invention is fluidizing furnace or rotary kiln, fluidizing furnace or
The temperature of rotary kiln is controlled between 700-1150 degree centigrade; When the roasting instrument adopts fluidizing furnace, also comprised the reducing roasting step that reducing material is carried out cyclone dust removal afterwards in the method for the present invention.
Compared to existing technology, beneficial effect of the present invention is: the waste heat that the method that the high temperature sulfate slag that directly utilizes fluidizing furnace to export of the present invention prepares iron powder is effectively utilized sulfate slag, directly reduce to sulfate slag; Can make full use of sulfate slag, can make full use of the waste heat of sulfate slag again, economize on resources to greatest extent, the protection environment.Method of the present invention has realized the grade of iron has been brought up to more than 92%, and the rate of recovery of iron can reach 95%.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Process flow sheet when Fig. 2 adopts rotary kiln for the present invention;
Process flow sheet when Fig. 3 adopts fluidizing furnace for the present invention.
Embodiment
The technical solution adopted in the present invention is as follows:
A kind of high temperature sulfate slag that directly utilizes fluidizing furnace to export prepares the method for iron powder, may further comprise the steps:
A: collect fluidizing furnace outlet high temperature sulfate slag;
B: above-mentioned high temperature sulfate slag, coal and flux are mixed by following weight part: high temperature sulfate slag: 55-95 part; Coal: 5-35 part; Flux: 0-20 part obtains the high temperature compound;
C: above-mentioned high temperature compound is directly carried out reducing roasting, obtain reducing material;
D: with reducing material directly into water cooling;
E: cooled raw material through ball milling, is obtained the ball milling material;
F: in magnetic separator after the magnetic separation, drying promptly obtains reduced iron powder with above-mentioned ball milling material.
Embodiment 1
Stove ore deposit sulfur-bearing 35% is gone into by certain pyrite-based sulfuric acid production factory, iron content 40%, and the high temperature sulfate slag ferrous grade of producing is 48.8%; With described high temperature furnace slag, adopt Wingdale to make flux, directly utilize the high temperature sulfate slag of fluidizing furnace outlet to prepare iron powder according to the proportioning in the table 1 by method of the present invention, concrete proportioning and the results are shown in Table 1:
Table 1
The foregoing description only is the preferred embodiments of the present invention, can not regard limiting the scope of the invention as, and the variation of any unsubstantiality that those skilled in the art is done on basis of the present invention and replacement all belong to the scope of protection of the invention.
Claims (7)
1. a high temperature sulfate slag that directly utilizes fluidizing furnace outlet prepares the method for iron powder, and it is characterized in that: it may further comprise the steps:
A: collect fluidizing furnace outlet high temperature sulfate slag;
B: above-mentioned high temperature sulfate slag, coal and flux are mixed by following weight part: high temperature sulfate slag: 55-95 part; Coal: 5-35 part; Flux: 0-20 part obtains the high temperature compound;
C: above-mentioned high temperature compound is directly carried out reducing roasting, obtain reducing material;
D: with reducing material directly into water cooling;
E: cooled raw material through ball milling, is obtained the ball milling material;
F: in magnetic separator after the magnetic separation, drying promptly obtains reduced iron powder with above-mentioned ball milling material.
2. the high temperature sulfate slag that directly utilizes fluidizing furnace to export according to claim 1 prepares the method for iron powder, it is characterized in that: comprise Fe in the described high temperature sulfate slag
2O
3And Fe
3O
4, and impurity, wherein iron level accounts between the 20-69% of high temperature sulfate slag total mass by weight percentage.
3. the high temperature sulfate slag that directly utilizes fluidizing furnace to export according to claim 1 prepares the method for iron powder, and it is characterized in that: described flux is one or more mixing in lime, Wingdale, magnesium limestone, the rhombspar.
4. the high temperature sulfate slag that directly utilizes fluidizing furnace to export according to claim 1 prepares the method for iron powder, and it is characterized in that: described magnetic separator is the Wet-type permanent magnet drum type magnetic separator, and the average magnetic induction density of tube table is 100～600mT.
5. the high temperature sulfate slag that directly utilizes fluidizing furnace to export according to claim 1 prepares the method for iron powder, and it is characterized in that: the temperature of described high temperature sulfate slag is 300-1000 degree centigrade.
6. the high temperature sulfate slag that directly utilizes fluidizing furnace to export according to claim 1 prepares the method for iron powder, and it is characterized in that: the ball milling method of described ball mill is the wet ball-milling mode.
7. the high temperature sulfate slag that directly utilizes fluidizing furnace to export according to claim 1 prepares the method for iron powder, and it is characterized in that: the equipment that is adopted in the described reducing roasting is fluidizing furnace or rotary kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101129302A CN102191349A (en) | 2011-05-03 | 2011-05-03 | Method for preparing iron powder by directly utilizing high temperature sulfuric acid slag at outlet of boiling furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101129302A CN102191349A (en) | 2011-05-03 | 2011-05-03 | Method for preparing iron powder by directly utilizing high temperature sulfuric acid slag at outlet of boiling furnace |
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| CN102191349A true CN102191349A (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101129302A Pending CN102191349A (en) | 2011-05-03 | 2011-05-03 | Method for preparing iron powder by directly utilizing high temperature sulfuric acid slag at outlet of boiling furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407339A (en) * | 2011-12-05 | 2012-04-11 | 哈尔滨东盛金属材料有限公司 | Preparation method for low-carbon low-sulphur reduced iron powder |
| CN102424875A (en) * | 2011-12-31 | 2012-04-25 | 湖南有色金属研究院 | Method for preparing sponge iron from sulfate cinder |
| CN105883931A (en) * | 2016-05-30 | 2016-08-24 | 摘塬勇鑫矿业投资控股（上海）有限公司 | Method for producing ferric oxide fine powder through high-temperature sulfuric-acid residues in fluidized bed combustion boiler |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469364A (en) * | 2007-12-25 | 2009-07-01 | 南化集团研究院 | Method for improving iron content in pyrite slag |
| CN101906499A (en) * | 2009-06-04 | 2010-12-08 | 吴道洪 | Iron-making method for treating sulfate slag by direct reduction, grinding and sorting |
-
2011
- 2011-05-03 CN CN2011101129302A patent/CN102191349A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469364A (en) * | 2007-12-25 | 2009-07-01 | 南化集团研究院 | Method for improving iron content in pyrite slag |
| CN101906499A (en) * | 2009-06-04 | 2010-12-08 | 吴道洪 | Iron-making method for treating sulfate slag by direct reduction, grinding and sorting |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407339A (en) * | 2011-12-05 | 2012-04-11 | 哈尔滨东盛金属材料有限公司 | Preparation method for low-carbon low-sulphur reduced iron powder |
| CN102424875A (en) * | 2011-12-31 | 2012-04-25 | 湖南有色金属研究院 | Method for preparing sponge iron from sulfate cinder |
| CN105883931A (en) * | 2016-05-30 | 2016-08-24 | 摘塬勇鑫矿业投资控股（上海）有限公司 | Method for producing ferric oxide fine powder through high-temperature sulfuric-acid residues in fluidized bed combustion boiler |
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Application publication date: 20110921 |