CN110172569A - The method of iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting - Google Patents
The method of iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting Download PDFInfo
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- CN110172569A CN110172569A CN201910588120.0A CN201910588120A CN110172569A CN 110172569 A CN110172569 A CN 110172569A CN 201910588120 A CN201910588120 A CN 201910588120A CN 110172569 A CN110172569 A CN 110172569A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
Abstract
The method that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting of the invention, step are as follows: using Refractory iron ore stone as raw material, after being crushed ore grinding, filtering means dehydration to water content≤12% obtains suspension roasting raw ore；Agricultural crop straw is taken, suspension roasting reducing agent is obtained after crushing；Suspension roasting reducing agent is added into suspension roasting raw ore, it mixes according to the ratio, carries out magnetizing roast, calcination atmosphere is neutrality, and in roasting process, it is continually fed into neutral gas, so that mixture reaches suspended state, controls relevant temperature and time, after being roasted, roasting pipe is taken out, is cooled to room temperature, roasting material is obtained；After material taking-up ore grinding will be roasted, magnetic separation obtains concentrate and tailing.This method limits, energy conservation and environmental protection is meanwhile, it is capable to obtain higher Iron grade and iron recovery index using agricultural crop straw as reducing agent by peculiar raw material proportioning.
Description
Technical field:
The invention belongs to technical field of mineral processing, and in particular to one kind is suspended using agricultural crop straw as reducing agent to be magnetized
The method of baked for producing iron ore concentrate.
Background technique:
China's iron ore deposit rich reserves, however China's iron ore deposit is integrally in that grade is low, grain size number is thin, mineral composition
Complicated feature causes it to develop and use difficulty big.To meet steel and iron industry to the great demand of iron ore, scientific worker encloses
Efficient utilize around refractory iron ore has carried out long-term research.People gradually recognize, only thoroughly change iron in ore mineral
Occurrence status, improve iron mineral and gangue mineral physical chemical differences, be just able to achieve its efficient separation.Based on above-mentioned
Understanding, has developed the selecting smelting combinations new technology such as flash magnetization roasting, suspending magnetization roasting.
Magnetizing roast technology is to realize refractory iron ore Efficient Development using one of effective exemplary means.Domestic and international section skilled worker
Author optimizes, in terms of the research and development of roasting equipment and backing mechanism research in roasting technique, achieves significant research achievement, promotes
The development of magnetizing roast technology.It needs to add reducing agent during refractory iron ore magnetizing roast.Currently used reducing agent master
Magnetizing roast is caused to discharge a large amount of greenhouse gases CO from non-renewable fossil energies such as blast furnace gas and natural gases2It makes
At greenhouse effects.It is difficult to meet the requirement of steel industry cleaning Green Development.
In recent years, as energy and environmental problem becomes increasingly conspicuous, people gradually recognize the importance of clean energy resource.Farming
Object stalk causes people to pay high attention to as a kind of low pollution, widely distributed, resourceful neutral carbon renewable and clean energy resource.
Agricultural crop straw has obtained very big attention as a kind of reproducible agricultural straw resource of cleaning, resource utilization, but still
50% stalk is had more than by direct burning disposal, causes serious environmental pollution and the great wasting of resources.Develop crops
Stalk resource efficiently utilizes new technology, realizes that its recycling efficiently utilizes, it has also become current urgent problem to be solved.
The main component of stalk is that C, H, O, N are had by the organic matters such as cellulose, lignin and a small amount of ash composition
Volatile matter content is high, carbon activity is high, ash content and low-sulfur content feature, easy pyrolytic gasification are that carbon monoxide, hydrogen, methane etc. are gone back
Originality gas.These reducibility gas are exactly the reducing agent that refractory iron ore magnetizing roast needs in the process.If by stalk this
Agricultural straw resource is used for iron ore magnetizing roast, can not only effectively reduce the carbon emission during magnetizing roast, and
It can solve environmental pollution caused by stalk directly burns, realize the collaboration cleaning of refractory iron ore resource and agricultural straw resource
Efficiently utilize.
Summary of the invention:
The purpose of the present invention is overcoming above-mentioned the shortcomings of the prior art, provide a kind of using agricultural crop straw as reduction
The method that agent suspending magnetization roasting produces iron ore concentrate, this method set refractory iron ore and agricultural crop straw system components
Meter controls the ratio of refractory iron ore and agricultural crop straw reducing agent, regulates and controls reaction condition, and stalk pyrolysis is made to generate reproducibility gas
The weak magnetic minerals such as bloodstone are reduced to ferromagnetic magnetic iron ore, realize iron ore magnetizing roast and stalk pyrolytic gasification by body
Efficient collaboration conversion, thus formed iron ore cleaning magnetizing roast production iron ore concentrate.
Further, the reaction condition includes reaction time, reaction temperature, gas flow.
Further, the reducibility gas includes hydrogen and carbon monoxide.
To achieve the above object, the invention adopts the following technical scheme:
A method of iron ore concentrate is produced by reducing agent suspending magnetization roasting of agricultural crop straw, comprising the following steps:
Step 1, iron ore is handled:
(1) using Refractory iron ore stone as raw material, refractory iron ore is crushed, ore grinding, keeps granularity in iron ore small
Reach 80% in the miberal powder content of 0.074mm grade, obtains ore milling product；
(2) ore milling product is filtered dehydration to water content≤12%.Obtain suspension roasting raw ore；
Step 2, prepared by reducing agent:
Agricultural crop straw is taken, the agricultural crop straw powder content that particle in agricultural crop straw is less than 0.9mm grade is crushed to
Reach 95%-100%, milling product is obtained, as suspension roasting reducing agent；
Step 3, suspension roasting:
(1) suspension roasting reducing agent is added into suspension roasting raw ore, is uniformly mixed, forms mixture, wherein described
Suspension roasting reducing agent adds 15~30% that quality is suspension roasting ore quality；
(2) roaster is added in mixture at room temperature, carries out magnetizing roast, calcination atmosphere is neutrality, and in roasting process
In, it is continually fed into neutral gas, so that mixture reaches suspended state, is roasted, maturing temperature is 600-850 DEG C, roasting
Material is 5-10min in roasting residing time in furnace, completes roasting, takes out roasting pipe, is cooled to room temperature, and obtains roasting material；
Step 4, magnetic separation separates:
Roasting material is taken out into ore grinding, ore milling product granularity is after accounting for 80% or more less than 0.038mm particle, to carry out magnetic
Choosing obtains concentrate and tailing, wherein concentrate Iron grade reaches 66% or more, and iron recovery reaches 90% or more.
In the step 1 (1), Refractory iron ore stone includes that component and mass percentage contain: TFe28%~
35%, SiO240%~50%, Al2O3< 1%, CaO < 5%, MgO < 5% etc..
In the step 1 (1), ore milling product granularity is integrally less than 0.1mm.
In the step 2, milling product partial size is integrally less than 1mm.
In the step 2, agricultural crop straw includes component and mass percentage is cellulose 40%~50%, half fiber
Dimension element 10%~15%, lignin 27%~32%, crude protein 8.8~9.8%, inorganic salts 6%~10%.
In the step 2, agricultural crop straw mainly includes C, H, O, S, N element.
In the step 3 (1), the hybrid mode of suspension roasting original and suspension roasting reducing agent are as follows: in closed container, shake
3~5min is swung, mixing is completed.
In the step 3 (2), neutral gas is inert gas or nitrogen, and it is mixed that the neutral gas is passed through flow velocity view
Depending on closing material treating capacity, so that mixture reaches subject to suspended state roasted.
In the step 3 (2), pipe cooling procedure is roasted are as follows: continue to be passed through neutral gas into roasting pipe, to keep roasting
Neutral atmosphere in managing is burnt, roasting pipe water cooling is air-cooled to room temperature to after 100~200 DEG C.
In the step 3 (2), magnetizing roast carries out in vertical suspension roaster.
In the step 3 (2), calcination atmosphere is pure nitrogen gas atmosphere or inert gas atmosphere.
In the step 4, ore milling product granularity is integrally less than 0.05mm.
In the step 4, magnetic separation mode are as follows: using magnetic separation tube to roasted product carry out magnetic separation, magnetic field strength be 180~
200A/m。
Beneficial effects of the present invention:
(1) the iron ore concentrate production method of the application is compared with traditional ore-dressing technique, using magnetizing roast selecting smelting combination skill
Art substantially increases the rate of recovery of iron, for refractory hematite, obtains roasted product strongly magnetic mineral conversion ratio > 95%, iron
The excellent index of concentrate grade > 65%, iron recovery > 90%.
(2) the application substitutes the change during iron ore suspending magnetization roasting with this neutral carbon renewable resource of stalk
Stone-type reducing agent is eliminated because of carbon emission caused by fossil type reducing agent use, and solved caused by stalk directly burns simultaneously
Environmental pollution realizes that the collaboration clean and effective of refractory iron ore resource and agricultural straw resource utilizes.
Detailed description of the invention:
It is reducing agent suspending magnetization roasting production iron ore concentrate that Fig. 1, which is according to the agricultural crop straw of exemplary embodiment of the present,
Process flow diagram.
Specific embodiment:
Following literary section suspends combined process flow chart and embodiment to the present invention by reducing agent of agricultural crop straw
The method of magnetizing roast production iron ore concentrate is described in detail.
Suspension roaster model OTF-1200 used in the examples；
Magnetic separation tube model XCSG- Φ 50；
Roasting material additive amount is 10g/ times, and fluidizing gas nitrogen injection flow is 100~300mL/min, so that roasting
Material reaches suspended state；
The corn stover of use from commercially available, corn stover include component and mass percentage be cellulose 40%~
50%, hemicellulose 10%~15%, lignin 27%~32%, crude protein 8.8~9.8%, inorganic salts 6%~10%.
Using the method that agricultural crop straw produces iron ore concentrate as reducing agent suspending magnetization roasting, process flow chart such as Fig. 1 institute
Show, comprising the following steps:
(1) preparation of raw ore: using typical refractory iron ore as raw ore, Refractory iron ore stone includes component and quality percentage
Content contains: TFe28%~35%, SiO240%~50%, Al2O3< 1%, CaO < 5%, MgO < 5% etc.；It is crushed, is ground
Mine makes in broken ore granularity be less than 0.074mm and accounts for 80% or more, obtains ore milling product, ore milling product is dehydrated,
It first staticly settles, removes most of Free water, then dried, 100 DEG C of drying temperature <, dehydration to water content≤10%
As experiment sample ore.
(2) preparation of agricultural crop straw: right under the conditions of 60 DEG C using baking oven using stalk as experiment agricultural crop straw
Stalk is dried, and continues 1 hour, for drying after sample, using pulverizer be crushed to 0.9mm or less material account for 95% with
On, agricultural crop straw sample is obtained, as experiment reducing agent.
(3) ingredient: to the sample ore and reducing agent progress ingredient after preparation, agricultural crop straw quality accounts for roasting in ingredient
With the 20-30% of miberal powder, the sample prepared is put into sample bag, is mixed, is that miberal powder sufficiently connects with agricultural crop straw powder
Touching.
(4) powder suspension magnetizing roast: the present invention uses use for laboratory OTF-1200 suspension roaster such as to carry out Roasting
It burns, calcination atmosphere is neutrality, and fluidizing gas is nitrogen；Nitrogen use level 100-300mL/min；Roasting material is added at room temperature
It into roasting pipe, stands ventilation 5min and drains air in device, roasting pipe is installed into roaster after air is discharged；Roaster
Temperature is controlled at 600-850 DEG C, and roasting material is 5-10min in roasting residing time in furnace；Roasting material adds by roaster
After thermal response, it is removed, is kept under nitrogen atmosphere together with roasting pipe, water cooling is air-cooled to room temperature to after 100 DEG C.Produced by experiment
Gas is discharged into atmosphere with gas-guide tube.
Under neutral atmosphere, at 140 DEG C or less, moisture and volatile oil start with vaporous form meeting temperature in stalk
Hair, when maturing temperature reaches 140 DEG C or more, the macromolecular polymer of composition agricultural crop straw cell wall starts to degrade, with temperature
The raising of degree, carbon monoxide and higher and higher with the production quantity of carbon dioxide；When maturing temperature reaches 210-220 DEG C, cellulose
Degradation reaction occurs, and when temperature reaches 270 DEG C, cellulose decomposition becomes key reaction, and reaction generates a large amount of carbon monoxide,
Due to oxygen-free atmosphere, hydrogen partial generation is also had, above-mentioned gas has reproducibility；As temperature further increases, in system
Key reaction becomes the reduction reaction of bloodstone；To which after reaction, product of roasting is mainly magnetic iron ore.Above-mentioned reaction is pressed respectively
Formula (1), (2), (3) occur.
(C6H10O5)n(s)-→CO(g)+H2(g)+C formula (1)
3Fe2O3(s)+CO (g)=2Fe3O4(s)+CO2(g) formula (2)
3Fe2O3(s)+H2(g)=2Fe3O4(s)+H2O (g) formula (3)
(5) magnetic separation separates: after reacting rear material is cooled to room temperature, roasting material being taken out ore grinding, ore milling product granularity
80% or more is accounted for for -0.038mm, magnetic separation, magnetic field strength 196A/m are carried out to roasted product using magnetic separation tube.Final iron ore concentrate
Grade is 65%~67%, and the rate of recovery is 90%~96%.
Below in conjunction with specific embodiment to according to the present invention raw by reducing agent suspending magnetization roasting of agricultural crop straw
The method for producing iron ore concentrate is described in detail.
Embodiment 1
(1) material prepares:
For the present embodiment for minal test, the sample ore used is Anshan iron and steel plant group mountain iron ore at the moment, belongs to Refractory iron ore
Stone, which includes component and mass percentage is after accounting for 80% to ore comminution to -0.074mm content, to carry out two sections
Magnetic separation including one section of weak magnetic, magneticly elect most of magnetic iron ore, and two sections of strong magnetic magneticly elect gangue mineral.After two stages of magnetic separation,
Iron ore after acquisition magnetic separation, chemical composition analysis the results are shown in Table 1.By analysis result it is found that TFe product in iron ore after the magnetic separation
Position is 67.51%, including component and quality accounting content containing FeO are 0.53%, major impurity SiO2Content is 1.16%, remaining
Impurity content is respectively less than 1%, which is bloodstone；
It is 9% by drying and dewatering at after magnetic separation 80 DEG C of iron ore to water content, roasted ore samples is made.
Table 1
| TFe | FeO | SiO2 | Al2O3 | CaO | MgO | P | S | It burns and loses |
| 67.51 | 0.53 | 1.16 | 0.47 | < 0.05 | 0.11 | 0.035 | 0.013 | 1.94 |
(2) maize farming object stalk is taken, after dry at 60 DEG C, pulverizer, which is crushed to, accounts for 100% less than 0.9mm material,
Roasting reduction agent is made.
Predominantly carbon, three kinds of hydrogen, oxygen elements are made in roasting reduction agent, decomposition is also easy to produce the reducibility gas such as CO, hydrogen,
Magnetizing roast process for bloodstone.The content of roasting reduction agent sulphur is 0.12%, and sulfur content is very low, and environmental pollution is very
It is small.
(2) ingredient:
Obtained roasted ore samples and roasting reduction agent are mixed with 4: 1 ratios, is fitted into bag and seals, mix well, ore particle with
Agricultural crop straw comes into full contact with, and roasting material is made.
(3) powder suspension magnetizing roast:
Magnetizing roast is carried out using suspension roaster, calcination atmosphere is neutrality, and fluidizing gas is nitrogen；Material is roasted in room
It is added under temperature in roasting pipe, stands ventilation 5min and drain air in device, be discharged after air and roasting pipe is installed into roasting
In furnace；And continue to be passed through nitrogen into roasting pipe, so that roasting material is reached suspended state, calciner temperature controls the roasting at 750 DEG C
Burning material in roasting residing time in furnace is 7.5min；Material is roasted after roasting stove heating reaction, is taken together with roasting pipe
Out, it is rapidly cooled to 100 DEG C under nitrogen atmosphere hereinafter, being gradually cooling to room temperature later.Gas produced by testing is with gas-guide tube
It is discharged into atmosphere.
(4) magnetic separation separates:
After reacting rear material is cooled to room temperature, roasting material is taken out into ore grinding, ore milling product granularity is that -0.038mm is accounted for
80% or more, magnetic separation, magnetic field strength 196A/m are carried out to roasted product using 50 type magnetic separation tube of XCSG- Φ.Obtain iron ore concentrate
Grade 69.43%, iron recovery 95.82%.
In the present embodiment, corn stover is used to carry out magnetizing roast to iron ore minal after magnetic separation for reducing agent, in original
Mine TFe grade is 67.51%, and corn stover dosage accounts under conditions of minal 25%, using suitable suspending magnetization roasting-magnetic
Technique is selected, the fine quality iron concentrate of Iron grade 69.43% and overall recovery 95.82% can be obtained.
Embodiment 2
For the present embodiment for the test of practical ore, the sample ore used is Anshan steel enterprise Qidashan iron ore stone, the ore packet
It includes component and mass percentage is shown in Table 2.By analysis result it is found that Qidashan iron ore stone TFe grade is 31.01%, FeO content
It is 1.11%, the practical ore main gangue mineral SiO2, content 49.43, remaining gangue mineral has Al2O3, CaO, MgO, contain
It measures less.
Table 2
| TFe | FeO | SiO2 | Al2O3 | CaO | MgO | P | S | It burns and loses |
| 30.61 | 1.11 | 49.43 | 0.37 | 1.59 | 3.05 | 0.025 | 0.042 | 1.64 |
(1) material prepares:
By Qidashan iron ore stone, comminution to -0.074mm content accounts for 80%, and drying and dewatering at 80 DEG C reaches its water content
8%, roasted ore samples are made.
Maize farming object stalk is dry at 50 DEG C, and product is crushed to pulverizer after drying accounts for less than 0.9mm material
100%, roasting reduction agent is made.
(2) ingredient:
Obtained roasted ore samples and roasting reduction agent are mixed with 5: 1 ratios, is fitted into bag and seals, mixing, mine fullys shake
Grain comes into full contact with agricultural crop straw, and roasting material is made.
(3) powder suspension magnetizing roast:
Magnetizing roast is carried out using use for laboratory OTF-1200 suspension roaster, calcination atmosphere is nitrogen atmosphere, fluidized gas
Body is nitrogen；Nitrogen use level 200mL/min；Roasting material is added at room temperature in roasting pipe, is stood ventilation 5min and is drained
Roasting pipe is installed into roaster by air in device after air is discharged；Calciner temperature is controlled at 800 DEG C, and roasting material exists
Roasting residing time in furnace is 5min；Material is roasted after roasting stove heating reaction, is removed together with roasting pipe, in nitrogen atmosphere
100 DEG C are rapidly cooled under enclosing hereinafter, being air-cooled to room temperature later, acquisition roasts material.
(4) magnetic separation separates:
Roasting material is taken out into ore grinding, ore milling product granularity is that -0.038mm accounts for 80% or more, and overall particle size is less than
0.05mm carries out magnetic separation, magnetic field strength 196A/m to roasted product using 50 type magnetic separation tube of XCSG- Φ.It is final to obtain iron essence
Mine grade 66.31%, iron recovery 94.26%.
In the present embodiment, using agricultural crop straw is reducing agent to Anshan iron and steel plant Qidashan iron ore magnetizing roast, in head grade
It is 31.01%, under conditions of stalk type reduction agent content is 20%, using suitable suspending magnetization roasting-magnetic separation process, can obtains
Obtain the iron ore concentrate of Iron grade 66.31% and overall recovery 94.26%.
Claims (9)
1. a kind of method for producing iron ore concentrate using agricultural crop straw as reducing agent suspending magnetization roasting, which is characterized in that including
Following steps:
Step 1, iron ore is handled:
(1) using Refractory iron ore stone as raw material, refractory iron ore is crushed, ore grinding, is less than granularity in iron ore
The miberal powder content of 0.074mm grade reaches 80%, obtains ore milling product；
(2) ore milling product is filtered dehydration to water content≤12%, obtains suspension roasting raw ore；
Step 2, prepared by reducing agent:
Agricultural crop straw is taken, the agricultural crop straw powder content that particle is less than 0.9mm grade in agricultural crop straw is crushed to and reaches
95%-100% obtains milling product, as suspension roasting reducing agent；
Step 3, suspension roasting:
(1) suspension roasting reducing agent is added into suspension roasting raw ore, is uniformly mixed, forms mixture, wherein the suspension
15~30% that quality is suspension roasting ore quality are added in roasting reduction agent；
(2) roaster is added in mixture at room temperature, carries out magnetizing roast, calcination atmosphere is neutrality, and in roasting process, is held
It is continuous to be passed through neutral gas, so that mixture reaches suspended state, roasted, maturing temperature is 600-850 DEG C, and roasting material exists
Roasting residing time in furnace is 5-10min, completes roasting, takes out roasting pipe, is cooled to room temperature, and obtains roasting material；
Step 4, magnetic separation separates:
Roasting material is taken out into ore grinding, ore milling product granularity is after accounting for 80% or more less than 0.038mm particle, to carry out magnetic separation, obtain
Obtain concentrate and tailing.
2. the method according to claim 1 that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting,
It is characterized in that, Refractory iron ore stone includes that component and mass percentage contain in the step 1 (1): TFe28%~
35%, SiO240%~50%, Al2O3< 1%, CaO < 5%, MgO < 5%.
3. the method according to claim 1 that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting,
It is characterized in that, ore milling product granularity is integrally less than 0.1mm in the step 1 (1).
4. the method according to claim 1 that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting,
It is characterized in that, in the step 2, milling product partial size is integrally less than 1mm in the step 4.
5. the method according to claim 1 that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting,
It is characterized in that, agricultural crop straw includes component and mass percentage is cellulose 40%~50% in the step 2,
Hemicellulose 10%~15%, lignin 27%~32%, crude protein 8.8~9.8%, inorganic salts 6%~10%.
6. the method according to claim 1 that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting,
It is characterized in that, roasting pipe cooling procedure in the step 3 (2) are as follows: continue to be passed through neutral gas into roasting pipe, to protect
Hold roasting manage in neutral atmosphere, roasting pipe water cooling is air-cooled to room temperature to after 100~200 DEG C.
7. the method according to claim 1 that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting,
It is characterized in that, ore milling product granularity is integrally less than 0.05mm in the step 4.
8. the method according to claim 1 that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting,
It is characterized in that, in the step 4, magnetic separation mode are as follows: magnetic separation is carried out to roasted product using magnetic separation tube, magnetic field strength is
180~200A/m.
9. the method according to claim 1 that iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting,
It is characterized in that, the concentrate Iron grade of acquisition reaches 66% or more, and iron recovery reaches 90% or more in the step 4.
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| CN113151668A (en) * | 2021-04-20 | 2021-07-23 | 东北大学 | Refractory iron ore powder for suspension magnetizing roasting and preparation method and application thereof |
| CN113265533A (en) * | 2021-05-18 | 2021-08-17 | 东北大学 | Roasting system and method for efficiently utilizing biomass |
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| CN113604659A (en) * | 2021-08-12 | 2021-11-05 | 广东工业大学 | Method for magnetizing and roasting iron tailings by biomass |
| CN113755692A (en) * | 2021-08-03 | 2021-12-07 | 广东工业大学 | Method for recovering iron ore concentrate by magnetizing roasting |
| CN113862463A (en) * | 2021-08-26 | 2021-12-31 | 广东工业大学 | Method for producing iron ore concentrate by reducing, suspending, magnetizing and roasting sawdust/bamboo sawdust pyrolysis gas |
| CN114054205A (en) * | 2021-10-09 | 2022-02-18 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Method for recovering pyrite |
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| CN113604657A (en) * | 2021-07-06 | 2021-11-05 | 中冶南方都市环保工程技术股份有限公司 | Method for improving metallization rate of reduced products of seaside placer and iron grade of concentrate |
| CN113755692A (en) * | 2021-08-03 | 2021-12-07 | 广东工业大学 | Method for recovering iron ore concentrate by magnetizing roasting |
| CN113604659A (en) * | 2021-08-12 | 2021-11-05 | 广东工业大学 | Method for magnetizing and roasting iron tailings by biomass |
| CN113862463A (en) * | 2021-08-26 | 2021-12-31 | 广东工业大学 | Method for producing iron ore concentrate by reducing, suspending, magnetizing and roasting sawdust/bamboo sawdust pyrolysis gas |
| CN114054205A (en) * | 2021-10-09 | 2022-02-18 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Method for recovering pyrite |
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