CN105903562A - Method for extracting iron ore concentrate from flyash - Google Patents
Method for extracting iron ore concentrate from flyash Download PDFInfo
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- CN105903562A CN105903562A CN201610239650.0A CN201610239650A CN105903562A CN 105903562 A CN105903562 A CN 105903562A CN 201610239650 A CN201610239650 A CN 201610239650A CN 105903562 A CN105903562 A CN 105903562A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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Abstract
The invention relates to a method for extracting iron ore concentrate from flyash. According to the technical scheme, flyash undergoes dry magnetic separation in a spiral dry magnetic separator with its magnetic field intensity being 0.3-0.5 T so as to obtain rough concentrate and dry tailings; after addition of water, the rough concentrate is put into a wet magnetic separator with its magnetic field intensity being 0.16-0.2 T to undergo wet magnetic separation so as to obtain wet magnetic concentrate; the wet magnetic concentrate or a mixture of the wet magnetic concentrate and second-stage tailings obtained in a subsequent process is put into a ball mill, water is added and then ball-milling is carried out until granularity of 70-90 wt% of the ball-milling product is less than 0.045 mm so as to obtain fine-ground ore slurry; the fine-ground ore slurry is added into a wet magnetic separator with its magnetic field intensity being 0.06-0.1 T so as to obtain first-stage concentrate; the first-stage concentrate is added into a wet magnetic separator with its magnetic field intensity being 0.04-0.08 T to undergo second-stage weak magnetic separation so as to obtain iron ore concentrate and second-stage tailings; and the second-stage tailings return to the step 3. The method of the invention has characteristics of simple process, low energy consumption, high iron grade of iron concentrate powder and high iron recovery rate.
Description
Technical field
The invention belongs to utilization of fly ash technical field.It is specifically related to a kind of method extracting iron ore concentrate from flyash.
Background technology
Flyash is the dust-like material collected from pulverized coal boiler flue gas, and it is the bulk solid waste that modern coal-burning power plant gives off.China is as the country with coal as main energy sources, and supply of electric power has considerable part to be by coal fired power generation.The most coal-fired total volume of cargo in storage of flyash produced is more than 1,000,000,000 tons, but also increases with the speed of annual 0.8～100,000,000 ton, and China has become ash discharge state maximum in the world.The process of flyash is not good at, and not only can produce air, soil and water body and pollute, and can take substantial amounts of soil, cause the biggest negative pressure to social economy and ecological environment.The most how turning waste into wealth, making the resource of flyash efficiently utilize is a problem that can not be ignored.
The utilization of domestic flyash is typically to produce the basis such as cement, concrete building materials, or is directly used in backfill.The technical merit of these methods and economic value added all ratios are relatively low.And ferrum, aluminum and some valuable metals do not obtain efficient recovery in flyash.
From flyash, reclaim ferrum, on the one hand the iron mineral enrichment being scattered in flyash, for Ferrous Metallurgy, can be improved the utilization rate of resource.On the other hand can be substantially reduced the iron content in flyash, that widens flyash utilizes scope, such as, for the zeolite industry with flyash as raw material and rubber industry, the iron dust in flyash, in objectionable impurities, needs to remove.Thus from flyash, extract fine iron breeze, it is relatively inexpensive rational Land use systems.
Ferrum in flyash is reclaimed and processes and mainly have the following aspects:
One is deferrization of pulverized coal ash, and i.e. using the iron mineral in flyash as except ferrum object, generally by sour molten process, the ferrum in flyash enters solution with Fe ionic species, then drains with waste liquid, and the ferrum in flyash is simply removed and could not be utilized effectively.
Aluminous fly-ash except ferrum (Cao Jian etc. aluminous fly-ash is except the experimentation of ferrum. mineral rock geochemistry is circulated a notice of, 2010.3), flyash is carried out decarburization through 900 DEG C of calcining 2h, then concentration of hydrochloric acid be 20%, liquid-solid ratio be 5:1, temperature be 80 DEG C and under conditions of mixing time is 60min, except though ferrum rate reaches more than 80%, but iron mineral does not the most reclaim, and consume a large amount of acid.
" a kind of fly ash highly is except the method for ferrum " (CN201510174024.3) patented technology, flyash fine powder is sequentially passed through reduction, magnetic separation, the process of salt Ore Leaching by this technology, although obtaining the Fe content flyash less than 0.02%, but it is not directed to the recycling of ferrum.
Two is that the ferrum in flyash reclaims as side-product, and the Iron Ore Powder in flyash, not as major product, is typically reclaimed by a magnetic separation, and the breeze Iron grade of recovery is the highest, is extremely difficult to smelting requirements.
" extraction carbon dust, Iron Ore Powder, first level flour coal ash and second class powered coal ash preparation technology from flyash " (CN201210183445.9) patented technology, powdered coal ash is obtained carbon dust, Iron Ore Powder, first level flour coal ash and second class powered coal ash through the first microfoam flotation and the second microfoam flotation and the separable recovery of magnetic separation by this technology, flyash has only done a stages of magnetic separation and has just obtained Iron Ore Powder, Iron Ore Powder of low quality.
Three is to reclaim Iron Ore Powder, though wet magnetic separation technique can obtain higher Iron grade by wet magnetic separation.But wet magnetic separation technique can consume substantial amounts of water resource, and the flyash of about 90wt% can be discharged as wet type mine tailing, not only takes up an area and pollute environment, and the building materials activity of mine tailing can reduce, and affects follow-up utilization.
Flyash through two stages of magnetic separation (Zhou Qiuling etc. the application of separation of ferro technique and exploration. hydraulic and electric engineering labor protection, 1998), the Iron grade iron ore concentrate more than 50% can be obtained, but concentrate Iron grade is the highest, SiO2Content is the most higher.
Powdered coal ash by one thick, an essence, sweep magnetic separation (Tang Yun etc. fly ash in electric power plant selects iron tests to study. mining industry research and development, 2008), although can obtain Iron grade is 50.95% and the response rate is the iron ore concentrate of 46.41%, but also exist that water consumption is many, energy consumption is high and the problem such as occupation of land.
Four is to reclaim Iron Ore Powder by dry type magnetic separation, is to be added without water during selecting ferrum, directly sorts from dry ash conveying pipeline or in the ash dropping cylinder of ash storehouse.Though the method technique is simple, equipment is few and energy consumption is low, but gangue mineral is easy to be mixed in iron ore concentrate, causes product iron grade the highest, and flyash magnetic plant is the most ripe at present, affects the effect of flyash dry type magnetic separation.
Huaneng Group, Hulunbeier City, Inner Mongol Yi Min power plant carry out from flyash Dry recovery iron powder test (Geng Lansheng. the feasibility of coal-burning power plant's Dry recovery flyash iron powder technique. flyash, 2009), although the iron powder grade iron ore concentrate more than 50% can be obtained.But still containing higher gangue mineral, it is extremely difficult to smelting requirements.
Summary of the invention
It is contemplated that overcome prior art defect, it is therefore an objective to provide that a kind of technique is simple, save energy consumption, fine iron breeze Iron grade is high and iron recovery the is high method extracting iron ore concentrate from flyash.
For achieving the above object, the comprising the concrete steps that of the technical solution used in the present invention:
Step one, being homogeneously added into by flyash in screw dry magnetic separator, carry out dry type magnetic separation, the field strength of dry type magnetic separation is 0.3～0.5T, obtains rough concentrate and dry type mine tailing.
Step 2, described rough concentrate adds water to concentration is 15 ~ 20wt%, obtain coarse-fine ore pulp, being added by described coarse-fine ore pulp and carry out wet magnetic separation in the first wet magnetic separator, the magnetic field intensity of wet magnetic separation is 0.16～0.2T, obtains wet magnetic separation concentrate and wet magnetic separation mine tailing.
Step 3, the compound of the two-stage nitration mine tailing described wet magnetic separation concentrate or described wet magnetic separation concentrate obtained with subsequent technique are placed in ball mill, and adding water to concentration is 40 ~ 50wt%, are milled to granularity and account for 70 ~ 90wt% less than 0.045mm, obtain fine grinding ore pulp.
Step 4, adding in the second wet magnetic separator by described fine grinding ore pulp, it is selected to carry out one section of weak magnetic, and the selected magnetic field intensity of one section of weak magnetic is 0.06～0.1T, it is thus achieved that one section of concentrate and one section of mine tailing.
Step 5, one section of concentrate being added in the 3rd wet magnetic separator, it is selected to carry out the weak magnetic of two-stage nitration, and the selected magnetic field intensity of the weak magnetic of two-stage nitration is 0.04 ~ 0.08T, it is thus achieved that iron ore concentrate and two-stage nitration mine tailing.Two-stage nitration mine tailing returns step 3.
Described flyash: TFe is 5 ~ 15%, and magnetic iron ore accounts for 45 ~ 70wt% of all iron content, SiO2Content is 40 ~ 60wt%；The described flyash granularity content less than 0.074mm is 50 ~ 75wt%.
Owing to using said method, the present invention compared with prior art has the positive effect that:
1. due to the fact that and flyash is carried out dry type magnetic separation, can disposably throw the dry type mine tailing except 70 ~ 80%, in addition to efficiency height, dry type mine tailing can also be directly used in building materials, it is to avoid flyash because of after getting wet activity and uniformity reduce；Another by flyash is carried out wet magnetic separation, can effectively remove the gangue mineral that rough concentrate in dry type magnetic separation is carried secretly.
2. due to the fact that and flyash is carried out ball milling, making iron content fly ash grain reach higher degree of dissociation, iron-bearing mineral and gangue mineral are efficiently separated, more selected by two sections of weak magnetic, improve iron concentrate grade.
3. due to the fact that two-stage nitration mine tailing iron content is higher, Armco magnetic iron content big and granule is relatively thick, for making iron mineral and gangue mineral efficiently separate, return it into step 3 ball milling again, significantly improve iron recovery.
4. the present invention not only overcomes more than the occupation of land of single wet magnetic separation water consumption last person ore deposit big, wet and pollutes the problem of environment, also solves the problem that the fine iron breeze Iron grade of single dry type magnetic separation is the highest.Achieve the mutual supplement with each other's advantages of dry type magnetic separation and wet magnetic separation, obtain optimal technological effect.
5. the iron recovery of the iron ore concentrate that the present invention is extracted is 53 ~ 55%, and TFe is 54 ~ 56%；The Iron grade of the dry type mine tailing after dry type magnetic separation is down to less than 3%.
Therefore, the feature that the present invention has that technique is simple, saves energy consumption, fine iron breeze Iron grade is high and iron recovery is high.
Detailed description of the invention
Embodiment
1
A kind of method extracting iron ore concentrate from flyash.Comprising the concrete steps that of the present embodiment embodiment:
Step one, being homogeneously added into by flyash in screw dry magnetic separator, carry out dry type magnetic separation, the field strength of dry type magnetic separation is 0.3～0.35T, obtains rough concentrate and dry type mine tailing.
Step 2, described rough concentrate adds water to concentration is 15 ~ 20wt%, obtain coarse-fine ore pulp, being added by described coarse-fine ore pulp and carry out wet magnetic separation in the first wet magnetic separator, the magnetic field intensity of wet magnetic separation is 0.16～0.17T, obtains wet magnetic separation concentrate and wet magnetic separation mine tailing.
Step 3, the compound of the two-stage nitration mine tailing described wet magnetic separation concentrate or described wet magnetic separation concentrate obtained with subsequent technique are placed in ball mill, and adding water to concentration is 40 ~ 50wt%, are milled to granularity and account for 70 ~ 80wt% less than 0.045mm, obtain fine grinding ore pulp.
Step 4, adding in the second wet magnetic separator by described fine grinding ore pulp, it is selected to carry out one section of weak magnetic, and the selected magnetic field intensity of one section of weak magnetic is 0.06～0.07T, it is thus achieved that one section of concentrate and one section of mine tailing.
Step 5, one section of concentrate being added in the 3rd wet magnetic separator, it is selected to carry out the weak magnetic of two-stage nitration, and the selected magnetic field intensity of the weak magnetic of two-stage nitration is 0.04 ~ 0.05T, it is thus achieved that iron ore concentrate and two-stage nitration mine tailing.Two-stage nitration mine tailing returns step 3.
Flyash described in the present embodiment be the dry discharge fly ash of northwest coal-burning power plant: TFe be 8 ~ 15%, magnetic iron ore accounts for 55 ~ 70wt% of all iron content, SiO2Content is 40 ~ 50wt%；The described flyash granularity content less than 0.074mm is 50 ~ 65wt%.
The iron recovery of the iron ore concentrate that the present embodiment is extracted is 53 ~ 53.5%, and TFe is 55.5 ~ 56%；The Iron grade of the dry type mine tailing after dry type magnetic separation is down to 2.2 ~ 2.4%.
Embodiment
2
A kind of method extracting iron ore concentrate from flyash.Comprising the concrete steps that of method described in the present embodiment:
Step one, being homogeneously added into by flyash in screw dry magnetic separator, carry out dry type magnetic separation, the field strength of dry type magnetic separation is 0.35～0.4T, obtains rough concentrate and dry type mine tailing.
Step 2, described rough concentrate adds water to concentration is 15 ~ 20wt%, obtain coarse-fine ore pulp, being added by described coarse-fine ore pulp and carry out wet magnetic separation in the first wet magnetic separator, the magnetic field intensity of wet magnetic separation is 0.17～0.18T, obtains wet magnetic separation concentrate and wet magnetic separation mine tailing.
Step 3, the compound of the two-stage nitration mine tailing described wet magnetic separation concentrate or described wet magnetic separation concentrate obtained with subsequent technique are placed in ball mill, and adding water to concentration is 40 ~ 50wt%, are milled to granularity and account for 70 ~ 80wt% less than 0.045mm, obtain fine grinding ore pulp.
Step 4, adding in the second wet magnetic separator by described fine grinding ore pulp, it is selected to carry out one section of weak magnetic, and the selected magnetic field intensity of one section of weak magnetic is 0.07～0.08T, it is thus achieved that one section of concentrate and one section of mine tailing.
Step 5, one section of concentrate being added in the 3rd wet magnetic separator, it is selected to carry out the weak magnetic of two-stage nitration, and the selected magnetic field intensity of the weak magnetic of two-stage nitration is 0.05 ~ 0.06T, it is thus achieved that iron ore concentrate and two-stage nitration mine tailing.Two-stage nitration mine tailing returns step 3.
Flyash described in the present embodiment is with embodiment 1.
The iron recovery of the iron ore concentrate that the present embodiment is extracted is 53.4 ~ 53.8%, and TFe is 55.2 ~ 55.6%；The Iron grade of the dry type mine tailing after dry type magnetic separation is down to 2.3 ~ 2.6%.
Embodiment
3
A kind of method extracting iron ore concentrate from flyash.Comprising the concrete steps that of method described in the present embodiment:
Step one, being homogeneously added into by flyash in screw dry magnetic separator, carry out dry type magnetic separation, the field strength of dry type magnetic separation is 0.4～0.45T, obtains rough concentrate and dry type mine tailing.
Step 2, described rough concentrate adds water to concentration is 15 ~ 20wt%, obtain coarse-fine ore pulp, being added by described coarse-fine ore pulp and carry out wet magnetic separation in the first wet magnetic separator, the magnetic field intensity of wet magnetic separation is 0.18～0.19T, obtains wet magnetic separation concentrate and wet magnetic separation mine tailing.
Step 3, the compound of the two-stage nitration mine tailing described wet magnetic separation concentrate or described wet magnetic separation concentrate obtained with subsequent technique are placed in ball mill, and adding water to concentration is 40 ~ 50wt%, are milled to granularity and account for 80 ~ 90wt% less than 0.045mm, obtain fine grinding ore pulp.
Step 4, adding in the second wet magnetic separator by described fine grinding ore pulp, it is selected to carry out one section of weak magnetic, and the selected magnetic field intensity of one section of weak magnetic is 0.08～0.09T, it is thus achieved that one section of concentrate and one section of mine tailing.
Step 5, one section of concentrate being added in the 3rd wet magnetic separator, it is selected to carry out the weak magnetic of two-stage nitration, and the selected magnetic field intensity of the weak magnetic of two-stage nitration is 0.06 ~ 0.07T, it is thus achieved that iron ore concentrate and two-stage nitration mine tailing.Two-stage nitration mine tailing returns step 3.
Flyash described in the present embodiment be the dry discharge fly ash of North China coal-burning power plant: TFe be 5 ~ 12%, magnetic iron ore accounts for 45 ~ 60wt% of all iron content, SiO2Content is 50 ~ 60wt%；The described flyash granularity content less than 0.074mm is 60 ~ 75wt%.
The iron recovery of the iron ore concentrate that the present embodiment is extracted is 53.4 ~ 53.6%, and TFe is 54.3 ~ 55%；The Iron grade of the dry type mine tailing after dry type magnetic separation is down to 2.7 ~ 3%.
Embodiment
4
A kind of method extracting iron ore concentrate from flyash.Comprising the concrete steps that of method described in the present embodiment:
Step one, being homogeneously added into by flyash in screw dry magnetic separator, carry out dry type magnetic separation, the field strength of dry type magnetic separation is 0.45～0.5T, obtains rough concentrate and dry type mine tailing.
Step 2, described rough concentrate adds water to concentration is 15 ~ 20wt%, obtain coarse-fine ore pulp, being added by described coarse-fine ore pulp and carry out wet magnetic separation in the first wet magnetic separator, the magnetic field intensity of wet magnetic separation is 0.19～0.2T, obtains wet magnetic separation concentrate and wet magnetic separation mine tailing.
Step 3, the compound of the two-stage nitration mine tailing described wet magnetic separation concentrate or described wet magnetic separation concentrate obtained with subsequent technique are placed in ball mill, and adding water to concentration is 40 ~ 50wt%, are milled to granularity and account for 80 ~ 90wt% less than 0.045mm, obtain fine grinding ore pulp.
Step 4, adding in the second wet magnetic separator by described fine grinding ore pulp, it is selected to carry out one section of weak magnetic, and the selected magnetic field intensity of one section of weak magnetic is 0.09～0.1T, it is thus achieved that one section of concentrate and one section of mine tailing.
Step 5, one section of concentrate being added in the 3rd wet magnetic separator, it is selected to carry out the weak magnetic of two-stage nitration, and the selected magnetic field intensity of the weak magnetic of two-stage nitration is 0.07 ~ 0.08T, it is thus achieved that iron ore concentrate and two-stage nitration mine tailing.Two-stage nitration mine tailing returns step 3.
Flyash described in the present embodiment is with embodiment 3.
The iron recovery of the iron ore concentrate that the present embodiment is extracted is 54.1 ~ 55%, and TFe is 54 ~ 54.6%；The Iron grade of the dry type mine tailing after dry type magnetic separation is down to 2.5 ~ 2.8%.
This detailed description of the invention compared with prior art has the positive effect that:
1. this detailed description of the invention is owing to carrying out dry type magnetic separation to flyash, can disposably throw the dry type mine tailing except 70 ~ 80%, in addition to efficiency height, dry type mine tailing can also be directly used in building materials, it is to avoid flyash because of after getting wet activity and uniformity reduce；Another by flyash is carried out wet magnetic separation, can effectively remove the gangue mineral that rough concentrate in dry type magnetic separation is carried secretly.
2. this detailed description of the invention is owing to carrying out ball milling to flyash, makes iron content fly ash grain reach higher degree of dissociation, and iron-bearing mineral and gangue mineral are efficiently separated, more selected by two sections of weak magnetic, improve iron concentrate grade.
3. this detailed description of the invention is owing to two-stage nitration mine tailing iron content is higher, Armco magnetic iron content big and granule is relatively thick, for making iron mineral and gangue mineral efficiently separate, returns it into step 3 ball milling again, significantly improves iron recovery.
4. this detailed description of the invention not only overcomes more than the occupation of land of single wet magnetic separation water consumption last person ore deposit big, wet and pollutes the problem of environment, also solves the problem that the fine iron breeze Iron grade of single dry type magnetic separation is the highest.Achieve the mutual supplement with each other's advantages of dry type magnetic separation and wet magnetic separation, obtain optimal technological effect.
5. the iron recovery of the iron ore concentrate that this detailed description of the invention is extracted is 53 ~ 55%, and TFe is 54 ~ 56%；The Iron grade of the dry type mine tailing after dry type magnetic separation is down to less than 3%.
Therefore, the feature that this detailed description of the invention has that technique is simple, saves energy consumption, fine iron breeze Iron grade is high and iron recovery is high.
Claims (2)
1. the method extracting iron ore concentrate from flyash, it is characterised in that comprising the concrete steps that of described method:
Step one, being homogeneously added into by flyash in screw dry magnetic separator, carry out dry type magnetic separation, the field strength of dry type magnetic separation is 0.3～0.5T, obtains rough concentrate and dry type mine tailing；
Step 2, described rough concentrate adds water to concentration is 15 ~ 20wt%, obtain coarse-fine ore pulp, being added by described coarse-fine ore pulp and carry out wet magnetic separation in the first wet magnetic separator, the magnetic field intensity of wet magnetic separation is 0.16～0.2T, obtains wet magnetic separation concentrate and wet magnetic separation mine tailing；
Step 3, the compound of the two-stage nitration mine tailing described wet magnetic separation concentrate or described wet magnetic separation concentrate obtained with subsequent technique are placed in ball mill, and adding water to concentration is 40 ~ 50wt%, are milled to granularity and account for 70 ~ 90wt% less than 0.045mm, obtain fine grinding ore pulp；
Step 4, adding in the second wet magnetic separator by described fine grinding ore pulp, it is selected to carry out one section of weak magnetic, and the selected magnetic field intensity of one section of weak magnetic is 0.06～0.1T, it is thus achieved that one section of concentrate and one section of mine tailing；
Step 5, one section of concentrate being added in the 3rd wet magnetic separator, it is selected to carry out the weak magnetic of two-stage nitration, and the selected magnetic field intensity of the weak magnetic of two-stage nitration is 0.04 ~ 0.08T, it is thus achieved that iron ore concentrate and two-stage nitration mine tailing；Two-stage nitration mine tailing returns step 3.
The method extracting iron ore concentrate from flyash the most according to claim 1, it is characterised in that described flyash: TFe is 5 ~ 15%, and magnetic iron ore accounts for 45 ~ 70wt% of all iron content, SiO2Content is 40 ~ 60wt%；The described flyash granularity content less than 0.074mm is 50 ~ 75wt%.
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Cited By (6)
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| CN107159429A (en) * | 2017-07-11 | 2017-09-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of hermetically sealed dry grinding dry separation craft of iron ore |
| CN107537676A (en) * | 2017-08-30 | 2018-01-05 | 四川深蓝环保科技有限公司 | A kind of method that iron is selected in flyash |
| CN108704762A (en) * | 2018-05-07 | 2018-10-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process |
| CN110479467A (en) * | 2019-08-28 | 2019-11-22 | 马钢集团设计研究院有限责任公司 | A kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone |
| CN110747308A (en) * | 2019-11-18 | 2020-02-04 | 武汉科技大学 | Converter LT zinc-containing dust online treatment system and treatment method thereof |
| CN115716719A (en) * | 2022-12-08 | 2023-02-28 | 宝武环科山西资源循环利用有限公司 | Method for preparing cement iron correcting material by utilizing fly ash magnetic separation process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107159429A (en) * | 2017-07-11 | 2017-09-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of hermetically sealed dry grinding dry separation craft of iron ore |
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| CN108704762A (en) * | 2018-05-07 | 2018-10-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process |
| CN110479467A (en) * | 2019-08-28 | 2019-11-22 | 马钢集团设计研究院有限责任公司 | A kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone |
| CN110747308A (en) * | 2019-11-18 | 2020-02-04 | 武汉科技大学 | Converter LT zinc-containing dust online treatment system and treatment method thereof |
| CN110747308B (en) * | 2019-11-18 | 2023-10-13 | 武汉科技大学 | Online treatment system and method for zinc-containing dust in converter LT |
| CN115716719A (en) * | 2022-12-08 | 2023-02-28 | 宝武环科山西资源循环利用有限公司 | Method for preparing cement iron correcting material by utilizing fly ash magnetic separation process |
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Application publication date: 20160831 |