CN111455170B - Method for separating and enriching chromium in chromium-containing sludge - Google Patents

Method for separating and enriching chromium in chromium-containing sludge Download PDF

Info

Publication number
CN111455170B
CN111455170B CN202010167049.1A CN202010167049A CN111455170B CN 111455170 B CN111455170 B CN 111455170B CN 202010167049 A CN202010167049 A CN 202010167049A CN 111455170 B CN111455170 B CN 111455170B
Authority
CN
China
Prior art keywords
chromium
containing sludge
temperature
drying
spinel phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010167049.1A
Other languages
Chinese (zh)
Other versions
CN111455170A (en
Inventor
邓腾飞
苗祥周
闫柏军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University of Technology WUT
Original Assignee
Wuhan University of Technology WUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan University of Technology WUT filed Critical Wuhan University of Technology WUT
Priority to CN202010167049.1A priority Critical patent/CN111455170B/en
Publication of CN111455170A publication Critical patent/CN111455170A/en
Application granted granted Critical
Publication of CN111455170B publication Critical patent/CN111455170B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
    • 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
    • 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
    • C22B34/00—Obtaining refractory metals
    • C22B34/30—Obtaining chromium, molybdenum or tungsten
    • C22B34/32—Obtaining chromium
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a method for separating and enriching chromium in chromium-containing sludge, which comprises the steps of roasting the chromium-containing sludge and ferric oxide under the protection of inert gas or reducing gas to form a ferrochrome spinel phase, and then utilizing the magnetism of the obtained ferrochrome spinel phase for subsequent separation. The method enriches the element chromium in the stable ferrochrome spinel phase through high-temperature roasting, can avoid the trivalent chromium element from being oxidized into hexavalent chromium by air, and reduces the potential threat to the environment. The method adopts a high-temperature fire method to treat the cold-rolled pickling chromium-containing sludge, takes ferric oxide as an additive, does not generate waste liquid, and can reduce secondary pollution to the environment compared with the traditional wet chromium extraction treatment method.

Description

Method for separating and enriching chromium in chromium-containing sludge
Technical Field
The invention relates to the technical field of chromium-containing sludge treatment, in particular to a method for separating and enriching chromium in chromium-containing sludge.
Background
The steel products of the steel plant are cold-rolled, chromium-plated and acid-washed to produce chromium-containing waste water, and the acid-washed waste water is subjected to reduction, precipitation, drying and other processes to produce a large amount of sludge. Because a large amount of trivalent chromium contained in the waste liquid is easily oxidized into hexavalent chromium by air at normal temperature, the waste liquid becomes solid waste which has great threat to the environment. And the chromium resource is in short supply in China, so the recovery of the chromium resource is extremely important. The steel output in China is huge, so that a large amount of cold-rolling pickling chromium-containing sludge is generated, and the problems of harmless treatment of solid wastes and recovery of chromium resources are very important. Because the chromium-containing sludge contains trace hexavalent high-toxicity chromium, high-temperature reduction is the best harmless treatment method. According to the characteristics of all production equipment and close process connection of iron and steel enterprises, the two methods which are feasible at present are as follows: the first method comprises the following steps: chromium-containing sludge is added into sintered ore and returned to a blast furnace for ironmaking, and chromium enters molten iron; the second method comprises the following steps: chromium-containing sludge, pelletizing, high-temperature reduction, recovery of Zn and Pb, removal of P, S, return of iron-containing pellets to a blast furnace for iron making, and feeding chromium into molten iron; the first method mentioned above must pay attention to strict technical management during the sintering process of the sludge to prevent secondary leakage pollution, and is difficult to implement; in the second method, the organic impurities are more, the water content is high, the potential threat to the environment is large, the acid and alkali consumption is large, and secondary pollution to the environment is easy to generate.
The patent number "CN 107267747B" entitled "method for promoting the chromium-containing sludge to be uniformly dispersed in iron ore sinter" discloses that the chromium-containing sludge is added into the iron ore sinter to improve the sintering performance, but higher content of sulfur and phosphorus inevitably enter the sinter, and the pollution of other nonferrous metals brings inconvenience to the subsequent blast furnace iron making and converter steel making.
Patent CN105347837B discloses a method for preparing light ceramsite by using chromium-containing sludge, which comprises the following steps: (1) providing raw materials according to the weight ratio; (2) wet grinding chromium-containing sludge to 150-200 meshes, dry grinding municipal sludge, weathered rocks, sludge, clay or kaolin to 100-150 meshes, dry grinding anthracite to 100-150 meshes, and dry grinding iron oxide or hematite to 100-150 meshes; (3) uniformly mixing various raw materials; (4) deeply thinning the mixed material, and extruding the mixed material into a ceramsite raw material by a granulator; (5) preheating and calcining the ceramsite raw material into light ceramsite by a double-cylinder rotary kiln, discharging and cooling to obtain a ceramsite finished product. The method effectively utilizes the chromium-containing sludge generated in leather production, can treat heavy metal pollutants simultaneously, and the prepared ceramsite can be reused in the building industry. In this patent, the main roles of anthracite are: reducing hexavalent chromium into trivalent chromium at a high temperature of 1000-1300 ℃; secondly, partial desulfurization is performed; and thirdly, maintaining the reducing atmosphere in the kiln to prevent the oxidation of trivalent chromium and prevent the oxidation and corrosion of refractory materials in the kiln, particularly the kiln top. The main purposes are as follows: the toxicity of the finished ceramsite is reduced. The main roles of iron oxide or hematite are: the composite ceramic can be used as a cosolvent to reduce the temperature during the production of ceramsite; secondly, the ceramsite can be used as an expanding agent, gas is generated in the ceramsite to expand under the action of anthracite and ferric oxide, the yield of the light ceramsite can be increased, and the lightweight ceramsite can be obtained. The main chemical reactions that occur are: 2Fe2O3+C→4FeO+CO2↑，2Fe2O3+3C→4Fe+3CO2↑，Fe2O3+C→2FeO+CO↑，Fe2O3+3C → 2Fe +3CO ↓ (C) × (2 Fe +3CO ×). The main purpose is to reduce the production energy consumption, and to manufacture lighter ceramsite, so that the ceramsite has wider usability. But the method can only use chromium for preparing ceramsite, the chromium yield in China is extremely low,however, the method cannot effectively recycle the scarce metal resources, which causes waste of resources.
Disclosure of Invention
The invention aims to solve the problems that cold-rolled pickling chromium-containing sludge is high in organic carbon content and water content, secondary pollution is difficult to avoid, and chromium cannot be effectively recovered, and provides a method for separating and enriching chromium in the chromium-containing sludge.
The invention is realized by the following steps:
the invention aims to provide a method for separating and enriching chromium in chromium-containing sludge, which comprises the steps of roasting the chromium-containing sludge and iron oxide under the protection of inert gas or reducing gas to form a ferrochrome spinel phase, and then carrying out subsequent separation by utilizing the magnetism of the obtained ferrochrome spinel phase.
Specifically, the method comprises the following steps:
step 1, drying and ball-milling chromium-containing sludge, and uniformly mixing the chromium-containing sludge with ferric oxide to obtain a mixture;
and 2, pelletizing and drying the obtained mixture, roasting at 700-1200 ℃ under the protection of inert gas or reducing gas, and cooling to obtain the chromium-enriched ferrochrome spinel phase after roasting.
Preferably, in the step 1, the specific method for drying the chromium-containing sludge is as follows: drying the chromium-containing sludge at 95-105 ℃ for 12-30 h; during ball milling, the mass ratio of the material balls is 1: 1-4, ball milling, and sieving with a 200-800 mesh sieve to obtain chromium-containing sludge powder;
preferably, the chromium-containing sludge and the ferric oxide are mixed according to the mass fraction ratio, and the mode of uniformly mixing the chromium-containing sludge and the ferric oxide comprises a ball milling method. The chromium-containing sludge is preferably 50-75%, and the ferric oxide is preferably 25-50%; if the content of the chromium-containing sludge is too high, part of chromium is not subjected to reduction reaction to form a ferrochrome spinel phase, and the chromium cannot be completely enriched; XRD results are shown in FIG. 4FeCr-temperature increases with iron oxide content2The peak of O4 gradually increases, but if the content of iron oxide is too high, waste is caused; therefore, the chromium-containing sludge is 50-75% and the ferric oxide is 25-50% which are the best proportion found by the inventor through experimental research.
Preferably, in the step 2, the inert gas includes one of argon, helium, neon, krypton and xenon; the reducing gas comprises hydrogen and carbon monoxide.
Preferably, the specific method for pelletizing in step 2 is as follows: 5-7% of water is added into a ball forming mill for ball forming, and then the ball is aged for 18-24 h. The specific operation of drying is as follows: and (3) drying the pellets obtained by pelletizing in a drying oven at 65-75 ℃ for 4-6 h.
Preferably, the roasting adopts gradient temperature roasting: when the temperature is less than 800 ℃, the temperature is kept for 30min at every hundred temperature points, and the heating rate is 5-10 ℃/min; when the temperature is more than or equal to 800 ℃, the heating rate is 3-7 ℃/min; keeping the temperature at 1100-1200 ℃ for 2-4 h, and then cooling the product with the furnace to obtain the chromium-enriched ferrochrome spinel phase.
The inventor finds that the temperature is too low, the spinel is not completely generated, the temperature is too high, and the particles are easy to agglomerate, so that the generated particles are non-uniformly distributed and have too wide size distribution; therefore, the temperature is preferably kept for 2 to 4 hours at 1100 to 1200 ℃;
before sintering at 1100-1200 ℃, keeping the temperature for 30min at every hundred temperature points when the temperature is less than 800 ℃, wherein the heating rate is 5-10 ℃/min; when the temperature is more than or equal to 800 ℃, the heating rate is 3-7 ℃/min, and the gradual heating is mainly considered, so that the sintering rate is appropriate, and the ferrochrome spinel phase with appropriate size is obtained.
Compared with the prior art, the invention has the following advantages and effects:
1. according to the method for separating and enriching chromium in chromium-containing sludge, chromium elements in the chromium-containing sludge which is easy to oxidize and unstable are firstly reconstructed into a stable ferrochrome spinel phase through a high-temperature mineral phase, and then the magnetism of the obtained ferrochrome spinel phase is utilized for subsequent separation; the prepared ferrochrome spinel phase has uniform granularity, can reduce the dispersion degree of chromium elements, and realizes the separation and pre-enrichment of the chromium elements so as to facilitate the subsequent separation.
2. According to the method for separating and enriching chromium in the chromium-containing sludge, provided by the invention, the element chromium is enriched in the stable ferrochrome spinel phase through high-temperature roasting, so that the trivalent chromium element can be prevented from being oxidized into hexavalent chromium by air, and the potential threat to the environment is reduced. The method adopts a high-temperature fire method to treat the cold-rolled pickling chromium-containing sludge, takes ferric oxide as an additive, does not generate waste liquid, and can reduce secondary pollution to the environment compared with the traditional wet chromium extraction treatment method.
Drawings
FIG. 1 is a scanning electron microscope image of a ferrochrome spinel phase formed by chromium-containing sludge particles after high-temperature roasting in example 1;
FIG. 2 is a scanning electron microscope image of a ferrochrome spinel phase formed by chromium-containing sludge particles after high-temperature roasting in example 2;
FIG. 3 is a scanning electron micrograph of a ferrochrome spinel phase formed from chromium-containing sludge particles after high-temperature roasting in example 3;
fig. 4 is an XRD result of the ferrochrome spinel phases obtained in examples 1 to 3.
Detailed Description
Example 1
The cold-rolled pickling chromium-containing sludge selected in the example comes from a large-scale steel enterprise. The chromium content of the cold-rolled pickling chromium-containing sludge of the enterprise is 8.08 percent, the carbon content is 11.6 percent, and the chromium is Cr with the valence of 32P6O18All of which are in the form of volatile organic carbon.
(1) Raw material treatment: drying the chromium-containing sludge at 100 ℃ for 24h, simply crushing the chromium-containing sludge by using a roller crusher, and then putting the crushed chromium-containing sludge into a rapid ball mill for ball milling for 8h, wherein the mass ratio of material balls is 1: 2, after ball milling, sieving the mixture by a 250-mesh sieve to prepare powder for later use. Further, a 325 mesh iron oxide powder was used for standby.
(2) Preparing materials and mixing: 25% of ferric oxide, 75% of chromium-containing sludge and uniformly mixing by ball milling for 6 hours, wherein the mass ratio of the material balls is 1: 1, obtaining a mixture.
(3) Pelletizing: adding 7% of water into a pelletizer, pelletizing, and ageing for 20 hours;
(4) and (3) drying: drying the pellets in a drying oven at 70 ℃ for 4 h;
(5) roasting: and (4) putting the dried blank into an electric furnace/kiln for sintering, and taking an argon atmosphere as a protective gas. And gradient temperature roasting is adopted during roasting: when the temperature is less than 800 ℃, the temperature is kept for 30min at every hundred temperature points, and the heating rate is 5-10 ℃/min; when the temperature is more than or equal to 800 ℃, the heating rate is 3-7 ℃/min; and preserving the heat for 2-4 hours at the temperature of 1100 ℃, and then cooling the heat with a furnace to obtain the chromium-enriched ferrochrome spinel phase.
In example 1, a scanning electron microscope image of a ferrochrome spinel phase formed by the chromium-containing sludge particles after high-temperature roasting is shown in fig. 1, which indicates that the magnetic ferrochrome spinel phase is successfully prepared, so that the magnetic separation is convenient for the next step.
Example 2
In this example, 40% of iron oxide and 60% of chromium-containing sludge were used, and the rest of the procedure was the same as in example 1. In example 2, a scanning electron microscope image of a ferrochrome spinel phase formed by the chromium-containing sludge particles after high-temperature roasting is shown in fig. 2, which indicates that the magnetic ferrochrome spinel phase is successfully prepared.
Example 3
In this example, 50% of iron oxide and 50% of chromium-containing sludge were used, and the rest of the procedure was the same as in example 1. In example 3, a scanning electron microscope image of a ferrochrome spinel phase formed by the chromium-containing sludge particles after high-temperature roasting is shown in fig. 3, which indicates that the magnetic ferrochrome spinel phase is successfully prepared.
Test example 1
The XRD patterns of the ferrochrome spinel phases having magnetic properties obtained in the analytical test examples 1 to 3 are shown in fig. 4. FIG. 4 shows FeCr, the same temperature, with increasing iron oxide content2The peak of O4 gradually increased.
The method is characterized in that the chromium-containing sludge in the reaction raw materials is preferably 50-75%, and the ferric oxide is preferably 25-50%; if the content of the chromium-containing sludge is too high, part of chromium is not subjected to reduction reaction to form a ferrochrome spinel phase, and the chromium cannot be completely enriched; if the content of the ferric oxide is too high, the magnetism is enhanced naturally, but too much iron causes the waste of resources; therefore, the chromium-containing sludge is 50-75% and the ferric oxide is 25-50% which are the best proportion found by the inventor through experimental research.
The invention is not to be considered as limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. The method for separating and enriching chromium in chromium-containing sludge is characterized in that the chromium-containing sludge and ferric oxide are roasted under the protection of inert gas or reducing gas to form a ferrochrome spinel phase, and then the magnetism of the ferrochrome spinel phase is utilized for subsequent separation, wherein the chromium-containing sludge and the ferric oxide are mixed according to the mass fraction ratio, wherein the chromium-containing sludge accounts for 50-75%, and the ferric oxide accounts for 25-50%; the chromium-containing sludge is cold-rolled pickled chromium-containing sludge;
the method comprises the following steps:
step 1, drying and ball-milling chromium-containing sludge, and uniformly mixing the chromium-containing sludge with ferric oxide to obtain a mixture; the mass ratio of the material balls during ball milling is 1: 1-4, ball milling, and sieving with a 200-800 mesh sieve to obtain chromium-containing sludge powder;
step 2, pelletizing and drying the obtained mixture, roasting at 700-1200 ℃ under the protection of inert gas or reducing gas, and cooling to obtain a chromium-enriched ferrochrome spinel phase after roasting; and gradient temperature roasting is adopted during roasting: when the temperature is less than 800 ℃, the temperature is kept for 30min at every hundred temperature points, and the heating rate is 5-10 ℃/min; when the temperature is more than or equal to 800 ℃, the heating rate is 3-7 ℃/min; preserving heat for 2-4 h at 1100-1200 ℃, and then cooling along with the furnace to obtain a chromium-enriched ferrochrome spinel phase;
the specific method for pelletizing in the step 2 comprises the following steps: 5-7% of water is added into a ball forming mill for ball forming, and then the ball is aged for 18-24 h.
2. The method of claim 1, wherein the specific method for drying the chromium-containing sludge in the step 1 is as follows: and drying the chromium-containing sludge at 95-105 ℃ for 12-30 h.
3. The method of claim 1, wherein the step 1 of mixing the chromium-containing sludge and the ferric oxide comprises a ball milling method.
4. The method of claim 1, wherein the inert gas comprises one of argon, helium, neon, krypton, and xenon; the reducing gas comprises hydrogen and carbon monoxide.
5. The method as claimed in claim 1, wherein the drying in step 2 is carried out by: and (3) drying the pellets obtained by pelletizing in a drying oven at 65-75 ℃ for 4-6 h.
CN202010167049.1A 2020-03-11 2020-03-11 Method for separating and enriching chromium in chromium-containing sludge Active CN111455170B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010167049.1A CN111455170B (en) 2020-03-11 2020-03-11 Method for separating and enriching chromium in chromium-containing sludge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010167049.1A CN111455170B (en) 2020-03-11 2020-03-11 Method for separating and enriching chromium in chromium-containing sludge

Publications (2)

Publication Number Publication Date
CN111455170A CN111455170A (en) 2020-07-28
CN111455170B true CN111455170B (en) 2021-10-29

Family

ID=71678422

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010167049.1A Active CN111455170B (en) 2020-03-11 2020-03-11 Method for separating and enriching chromium in chromium-containing sludge

Country Status (1)

Country Link
CN (1) CN111455170B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112063860B (en) * 2020-08-31 2022-08-05 中国科学院过程工程研究所 Method for extracting chromium from chromium-containing material
CN111944992B (en) * 2020-08-31 2022-09-13 湖北振华化学股份有限公司 Method for extracting chromium from chromite
CN112457689A (en) * 2020-12-16 2021-03-09 长沙理工大学 Preparation method for preparing ceramic pigment from chromium-containing industrial wastewater and ceramic pigment
CN113564385B (en) * 2021-07-26 2023-01-20 中钢集团马鞍山矿山研究总院股份有限公司 Method for efficiently enriching, separating and recovering chromium in chromium-containing sludge in iron and steel plant
CN113564363B (en) * 2021-07-26 2022-08-16 中钢集团马鞍山矿山研究总院股份有限公司 Method for enriching and recovering chromium resource by synergistic utilization of chromium-containing sludge and chromium-containing waste residue
CN114314997B (en) * 2022-03-14 2022-06-21 中南大学 Electroplating chromium-containing wastewater resource treatment method based on interface coordination regulation

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109500046A (en) * 2018-09-21 2019-03-22 浙江金泰莱环保科技有限公司 Chromium strengthens cured method in one kind waste containing chromium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109500046A (en) * 2018-09-21 2019-03-22 浙江金泰莱环保科技有限公司 Chromium strengthens cured method in one kind waste containing chromium

Also Published As

Publication number Publication date
CN111455170A (en) 2020-07-28

Similar Documents

Publication Publication Date Title
CN111455170B (en) Method for separating and enriching chromium in chromium-containing sludge
Tang et al. Pilot-scale extraction of iron from flotation tailings via suspension magnetization roasting in a mixture of CO and H2 followed by magnetic separation
Wu et al. Harmless treatment and resource utilization of stainless steel pickling sludge via direct reduction and magnetic separation
CN112226615B (en) Comprehensive utilization method of stainless steel solid waste
CN107082429A (en) A kind of method that utilization Dust of Iron And Steel Works prepares cementite
CN113528810A (en) Method for treating mixture of laterite nickel ore leaching slag and jarosite slag and application
CN1861265B (en) Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite
CN114164346B (en) Method for synergistically recovering valuable metals in chromium-containing waste residues and carbon-containing waste materials
WO2023004925A1 (en) Method for enriching and recovering chromium resources by synergistic utilization of chromium-containing sludge and chromium-containing waste residue
CN113104939B (en) Method for preparing micro-electrolysis active coke filler by using metallurgical dust and mud
CN114317954A (en) Method for cooperatively treating and utilizing stainless steel pickling sludge and blast furnace dust
US4042375A (en) Roasting process for the direct reduction of ores
CN113355510A (en) Pellet based on secondary resources such as scrap iron and preparation method thereof
CN115261638B (en) Method for preparing nickel iron and iron concentrate by utilizing high-magnesium laterite-nickel ore and red mud in synergy
CN113621794B (en) Method for full-resource cooperative utilization of gas ash and coal gangue
CN112029992B (en) Material for promoting nickel slag reduction and preparation method thereof
CN112941311B (en) Preparation method of composite cold-pressed pellets for converter steelmaking
CN110564969B (en) Method for comprehensively recovering lead, zinc and iron in blast furnace gas ash
CN114410989A (en) Method for resource utilization of vanadium extraction tailings
CN113528813A (en) Preparation method of iron powder and vanadium-rich titanium material
Tu et al. Detoxication and recycling of chromium slag and C-bearing dust via composite agglomeration process (CAP)-blast furnace method
CN111485098A (en) Method for dezincification of converter mud by microwave reduction roasting
Man et al. A study of direct reduction characteristics of Bayer process red mud-coal composite pellets
CN110699588B (en) Method for directly preparing thin strip steel from iron oxide
CN115477501B (en) Resource comprehensive utilization method of germanium extraction residues

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant