CN102925612A - Method for extracting sponge iron from sulfate slag by reducing roasting of tunnel kiln - Google Patents
Method for extracting sponge iron from sulfate slag by reducing roasting of tunnel kiln Download PDFInfo
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- CN102925612A CN102925612A CN2012104288127A CN201210428812A CN102925612A CN 102925612 A CN102925612 A CN 102925612A CN 2012104288127 A CN2012104288127 A CN 2012104288127A CN 201210428812 A CN201210428812 A CN 201210428812A CN 102925612 A CN102925612 A CN 102925612A
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Abstract
The invention discloses a method for extracting sponge iron from sulfate slag by the reducing roasting of a tunnel kiln. The method comprises the following steps: mixing sulfate slag raw material, reducing agent with desulfurizing agent, pressing the mixed raw materials into a hollow brick block, distributing into a tunnel kiln to be roasted in a reducing way, wherein the weight ratio of the reducing agent to the sulfate slag is (1-4):1, the adding quantity of the desulfurizing agent is 0-20%, the reducing roasting temperature is 1000DEG C-1200DEG C, and the reducing roasting time is 6h-24h, cooling, drying and finely grinding after reducing roasting, and magnetically selecting to obtain the sponge iron. The method is simple in technological process, convenient in operation process, good in product quality, and good in economic benefit, so that the good furnace charge can be provided for the production of an electric furnace.
Description
Technical field
The present invention relates to the smelting extraction process of sponge iron in a kind of field of metallurgy, relate in particular to a kind of method of utilizing tunnel furnace from sulfate slag, to extract sponge iron.
Background technology
Sulfate slag is as raw material,, to be commonly called as " slag " or " sulfate slag " take sulfurous iron ore (such as pyrite, pyrrhotite, white pyrite etc.) by a kind of industrial residue of discharging behind the boiling roaster extracting sulfuric acid.Every production 1t sulfuric acid will be discharged the sulfate slag of 0.7t～1.0t.China is gas washing in SA production big country, and annual sulfate slag 10 million ton of discharging accounts for 30% of the whole nation year chemical waste residue total amount of discharging.According to statistics, present domestic production sulfuric acid and the sulfate slag that discharges only 10% is utilized, all the other are stored up as waste, in case blowing and raining, these sulfate slags bring red stream and sour water pollution will for farmland, pond and rivers.
Developed country generally adopts sulfur-bearing more than 45% and the few production of sulfur from pyrite of foreign matter content acid, and sulfate slag can directly be used as iron-smelting raw material, so its utilization ratio height has been obtained good effect aspect comprehensive utilization.For example the utilization ratio of Japanese sulfate slag is 70%～80%, and the U.S. is 80%～85%, and West Germany, Spain are almost 100%.Although having some chemical plant to use sulphur instead, China prepares sulfuric acid, reducing the quantum of output of sulfate slag,, the explored virgin sulfur resource of China is very rare, and 20%, 80% the sulphur that only accounts for the sulphur total resources exists with the form of sulfurous iron ore.From the byproducts such as oil, Sweet natural gas reclaim sulphur and mainly rely on abroad, China at present still can only be take ore sulphur as main.Therefore, in foreseeable future, sulfate slag is also with long-term existence.The comprehensive development and utilization sulfate slag trend that also will be inevitable.In addition, the Mineral resources that China can utilize within the border reduce year by year, therefore, accelerate to carry out the comprehensive utilizating research of sulfate slag, be conducive to open up the anaplerotic sequence of Mineral resources, turn waste into wealth, also be conducive to prevent and treat environmental pollution, have good economic benefit and application prospect.
At present, extract from sulfate slag that valency iron is arranged is one of approach that utilizes sulfate slag, there is the extracting method of valency iron to mainly contain magnetic method, gravity separation method, magnetic separation-gravity treatment beneficiation combined method method and magnetizing roasting-magnetic separation integrated process, but because sulfate slag complicated component, sulphur content is higher, sometimes also contain precious metal and non-ferrous metal, the iron ore concentrate sulphur content of extracting by these methods is still higher, can't satisfy the basic demand of blast-furnace smelting.Therefore, carrying in the technique of iron at sulfate slag, how to reduce its sulphur content when improving the iron grade of product, is our problem in the urgent need to address.
Direct-reduced iron (being sponge iron) is the necessary high-quality furnace refractory of modern electrosmelting high-quality steel, also can be used as the refrigerant of converter steelmaking.Day by day low along with the worsening shortages in steel scrap source and waste steel quality, more and more urgent to the demand of high-quality sponge iron as the Electric furnace steel making of smelting iron and steel flow process important procedure.At present the output of sponge iron is come rapid development at recent two decades in the world, and annual rate of increase on average about 15%, has reached 6,000 ten thousand ton/years now, but the output of China 900,000 ton/years of less thaies also.From 2002, China also began to have by a relatively large margin growth to the demand of sponge iron, and the main source of sponge iron dependence on import still.Therefore, the output of raising sponge iron also is the inevitable requirement of China's Electric furnace steel making industry development.
At present, China mainly adopts shaft furnace or rotary kiln to carry out direct-reduction and produces sponge iron, but be adopt that shaft furnace or rotary kiln produce that sponge iron all is difficult to stablize, efficiently operation, and the grade of product and the rate of recovery also have much room for improvement.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, provide that a kind of technical process is simple, process operation convenience, good product quality, good in economic efficiency, can from sulfate slag, extract the method for sponge iron for electric furnace production provides the tunnel kiln reduction roasting that utilizes of high-quality furnace charge.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of method of utilizing the tunnel kiln reduction roasting to extract sponge iron from sulfate slag, may further comprise the steps: with the sulfate slag raw material, reductive agent and desulphurizer mixing, mixed raw material is pressed into hollow fragment of brick and is distributed into carry out reducing roasting in the tunnel furnace, the mass ratio of described reductive agent and sulfate slag raw material is (1～4): 1, the addition of described sweetening agent is 0～20% of sulfate slag raw materials quality, the reducing roasting temperature is 1000 ℃～1200 ℃, recovery time is 6h～24h, and the weak magnetic high price ferriferous oxide that is burnt in the sulfate slag raw material by reduction is converted into ferromagnetic metallic iron; Cool off after reducing roasting is finished, oven dry, fine grinding, at last by the further imurity-removal mineral of magnetic separation, final production goes out the high-quality sponge iron of high ferro (concentrate iron grade is greater than 90%, and iron recovery is greater than 80%), high degree of metalization (degree of metalization is greater than 90%), low-sulfur (sulphur content＜0.1%).
The method of sponge iron is extracted in the above-mentioned tunnel kiln reduction roasting that utilizes from sulfate slag, preferred, the iron grade in the described sulfate slag raw material is 35%～65%, sulphur content 0.2%～5% (massfraction), and granularity accounts for 40%～90% for-200 orders.
The method of sponge iron is extracted in the above-mentioned tunnel kiln reduction roasting that utilizes from sulfate slag, described reductive agent is preferably one or more in bituminous coal, coke, the hard coal.
The method of sponge iron is extracted in the above-mentioned tunnel kiln reduction roasting that utilizes from sulfate slag, described sweetening agent is preferably one or more in unslaked lime, Wingdale, the rhombspar, and the addition of described sweetening agent is preferably 5～20%.
The method of sponge iron is extracted in the above-mentioned tunnel kiln reduction roasting that utilizes from sulfate slag, the grinding machine that described fine grinding is adopted is preferably vertical mill, tower grinding machine, ball mill or rod mill, and grinding fineness accounts for 60%～100% for-200 orders.
The method of sponge iron is extracted in the above-mentioned tunnel kiln reduction roasting that utilizes from sulfate slag, the magnetic plant that described magnetic separation is adopted is preferably drum-type magnetic separator or magnetic separation tube, and magneticstrength is controlled to be 400Gs～2000Gs.
The method of sponge iron is extracted in the above-mentioned tunnel kiln reduction roasting that utilizes from sulfate slag, described hollow fragment of brick preferably obtains after solid fragment of brick is offered a plurality of through holes.Preferably, described through hole is evenly distributed on the hollow fragment of brick and presents cellular.
Compared with prior art, the invention has the advantages that: the present invention adopts tunnel kiln direct reduced art breading sulfate slag, carry out again reducing roasting after particularly adopting hollow brick dies that mixing raw material is pressed into hollow fragment of brick, this not only is conducive to improve the ventilation property of forming blocks, and in explained hereafter, be conducive to improve the height that stacks bricks, so also corresponding being improved for the treatment of capacity; Have, by raw material being pressed into the hollow brick form, more be conducive to the carrying out of reduction reaction, Reaction time shorten improves desulfurization degree widely, reduces unit consumption of energy; The forming blocks intensity of compacting is good simultaneously, can move transportation.
To sum up, the present invention not only condition of controlling of processing unit is good, and can obtain high purity, high-grade iron ore concentrate, and iron recovery is high, and degree of metalization is high, and sulphur content effectively reduces; Whole technical process is simple, and process operation is convenient, and better economic benefit can provide high-quality furnace charge (reinforcement electrosmelting) for electric furnace production, for new approach has been opened up in effective utilization of China's present stage sulfate slag.
Description of drawings
Fig. 1 is the process flow sheet of the inventive method.
Fig. 2 is the hollow fragment of brick profile photo that the embodiment of the invention 2 Raws are pressed into.
Embodiment
The invention will be further described with concrete preferred embodiment below in conjunction with Figure of description, but protection domain not thereby limiting the invention.
Embodiment 1:
A kind of as shown in Figure 1 method of utilizing the tunnel kiln reduction roasting to extract sponge iron from sulfate slag of the present invention may further comprise the steps:
(1) reducing roasting: with the sulfate slag raw material, reductive agent and sweetening agent fully mix, sulfate slag raw material sources in the present embodiment are in somewhere, Henan sulfate slag, its chemical ingredients mainly comprises TFe62.95%, S0.39%, granularity accounts for 86.5% for-200 orders, reductive agent in the present embodiment is bituminous coal (originating from Xinjiang), sweetening agent is Wingdale, mixed raw material is pressed into hollow fragment of brick (hollow fragment of brick is to obtain) and is distributed into carry out reducing roasting in the tunnel furnace after solid fragment of brick is offered a plurality of through holes, the mass ratio of reductive agent coal dust and sulfate slag raw material is 2.5: 1, the addition of sweetening agent is 12% of sulfate slag raw materials quality, the reducing roasting temperature is 1100 ℃, recovery time is 6h, and the weak magnetic high price ferriferous oxide that is burnt in the sulfate slag raw material by reduction is converted into ferromagnetic metallic iron;
(2) fine grinding magnetic separation: directly product is poured into water after reducing roasting is finished and cools off; Oven dry; Then the material after will drying is packed into and is carried out fine grinding in the ball mill, and grinding fineness accounts for 89.3% for-200 orders; Then getting the 20g sample ore sorts at XCGS-73 type magnetic separation tube, magneticstrength is 600Gs, at last by the further imurity-removal mineral of magnetic separation, final production goes out the high-quality sponge iron of high ferro (concentrate iron grade is 90.23%, and iron recovery is 91.35%), high degree of metalization (degree of metalization is 92.99%), low-sulfur (sulphur content is 0.05%).
Embodiment 2:
A kind of as shown in Figure 1 method of utilizing the tunnel kiln reduction roasting to extract sponge iron from sulfate slag of the present invention may further comprise the steps:
(1) reducing roasting: with the sulfate slag raw material, reductive agent and sweetening agent fully mix, sulfate slag raw material sources in the present embodiment are in somewhere, Anhui sulfate slag, its chemical ingredients mainly comprises TFe52.33%, S1.24%, granularity accounts for 83.2% for-200 orders, reductive agent in the present embodiment is bituminous coal (originating from Henan), sweetening agent is Wingdale, mixed raw material is pressed into hollow fragment of brick, and (hollow fragment of brick is to obtain after evenly offering eight through holes on the solid fragment of brick, be cellular, referring to Fig. 2) and be distributed into and carry out reducing roasting in the tunnel furnace, the mass ratio of reductive agent coal dust and sulfate slag raw material is 3: 1, the addition of sweetening agent is 8% of sulfate slag raw materials quality, the reducing roasting temperature is 1050 ℃, recovery time is 7h, and the weak magnetic high price ferriferous oxide that is burnt in the sulfate slag raw material by reduction is converted into ferromagnetic metallic iron;
(2) fine grinding magnetic separation: directly product is poured into water after reducing roasting is finished and cools off; Oven dry; Then the material after will drying is packed into and is carried out fine grinding in the ball mill, and grinding fineness accounts for 92.5% for-200 orders; Then getting the 20g sample ore sorts at XCGS-73 type magnetic separation tube, magneticstrength is 600Gs, at last by the further imurity-removal mineral of low intensity magnetic separation, final production goes out the high-quality sponge iron of high ferro (concentrate iron grade is 90.11%, and iron recovery is 87.65%), high degree of metalization (degree of metalization is 93.50%), low-sulfur (sulphur content is 0.07%).
Simultaneous test:
For verify the present invention adopt after the hollow brick reducing roasting with technique effect, the mixing raw material among the embodiment 2 is pressed into respectively hollow fragment of brick for we and solid fragment of brick compares test, its test-results is as shown in table 1 below, when the recovery time is all 7h, grade, the rate of recovery, the degree of metalization of the iron ore concentrate that obtains after the direct-reduction-magnetic separation of hollow fragment of brick process all is significantly higher than the iron ore concentrate of solid fragment of brick, and the sulphur content in the concentrate only has 0.07%, and sweetening effectiveness is very obvious.When the recovery time of solid fragment of brick extends to 11h, though the indices of the iron ore concentrate that obtains after the magnetic separation increase, but still good not as good as the reduction effect of hollow fragment of brick.
The hollow fragment of brick of table 1 and solid fragment of brick direct-reduction effect are relatively
Claims (7)
1. method of utilizing the tunnel kiln reduction roasting from sulfate slag, to extract sponge iron, may further comprise the steps: with the sulfate slag raw material, reductive agent and desulphurizer mixing, mixed raw material is pressed into hollow fragment of brick and is distributed into carry out reducing roasting in the tunnel furnace, the mass ratio of described reductive agent and sulfate slag raw material is (1～4): 1, the addition of described sweetening agent is 0～20% of sulfate slag raw materials quality, the reducing roasting temperature is 1000 ℃～1200 ℃, recovery time is 6h～24h, reducing roasting is cooled off after finishing, oven dry, fine grinding, by magnetic separation, obtain sponge iron at last.
2. the method for utilizing the tunnel kiln reduction roasting from sulfate slag, to extract sponge iron according to claim 1, it is characterized in that: the iron grade in the described sulfate slag raw material is 35%～65%, sulphur content 0.2%～5%, granularity accounts for 40%～90% for-200 orders.
3. the method for utilizing the tunnel kiln reduction roasting to extract sponge iron from sulfate slag according to claim 1 and 2, it is characterized in that: described reductive agent is one or more in bituminous coal, coke, the hard coal.
4. the method for utilizing the tunnel kiln reduction roasting from sulfate slag, to extract sponge iron according to claim 1 and 2, it is characterized in that: described sweetening agent is one or more in unslaked lime, Wingdale, the rhombspar, the addition of described sweetening agent is 5～20%.
5. the method for utilizing the tunnel kiln reduction roasting from sulfate slag, to extract sponge iron according to claim 1 and 2, it is characterized in that: the grinding machine that described fine grinding is adopted is vertical mill, tower grinding machine, ball mill or rod mill, and grinding fineness accounts for 60%～100% for-200 orders.
6. the method for utilizing the tunnel kiln reduction roasting to extract sponge iron from sulfate slag according to claim 1 and 2 is characterized in that: the magnetic plant that described magnetic separation is adopted is drum-type magnetic separator or magnetic separation tube, and magneticstrength is controlled to be 400Gs～2000Gs.
7. the method for utilizing the tunnel kiln reduction roasting to extract sponge iron from sulfate slag according to claim 1 and 2, it is characterized in that: described hollow fragment of brick is to obtain after solid fragment of brick is offered a plurality of through holes.
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Cited By (4)
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|---|---|---|---|---|
| CN104451014A (en) * | 2014-11-14 | 2015-03-25 | 贵州大学 | Method for preparing sponge iron from pyrite cinder |
| CN104611497A (en) * | 2015-01-19 | 2015-05-13 | 李成武 | Method for directly reducing nickel-bearing pig iron from laterite-nickel ore in thermal-storage nickel-iron tunnel kiln |
| CN107937650A (en) * | 2017-10-28 | 2018-04-20 | 朝阳金河粉末冶金材料有限公司 | A kind of method for suppressing production sponge iron sulfurizing |
| CN112080635A (en) * | 2020-09-08 | 2020-12-15 | 湖北理工学院 | Method for preparing iron concentrate powder by sulfate slag biomass-based self-reduction |
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| CN104451014A (en) * | 2014-11-14 | 2015-03-25 | 贵州大学 | Method for preparing sponge iron from pyrite cinder |
| CN104611497A (en) * | 2015-01-19 | 2015-05-13 | 李成武 | Method for directly reducing nickel-bearing pig iron from laterite-nickel ore in thermal-storage nickel-iron tunnel kiln |
| CN107937650A (en) * | 2017-10-28 | 2018-04-20 | 朝阳金河粉末冶金材料有限公司 | A kind of method for suppressing production sponge iron sulfurizing |
| CN112080635A (en) * | 2020-09-08 | 2020-12-15 | 湖北理工学院 | Method for preparing iron concentrate powder by sulfate slag biomass-based self-reduction |
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Application publication date: 20130213 |