CN117324115A - Method for pre-enriching ferro-manganese ore, suspension roasting, separation and enrichment - Google Patents
Method for pre-enriching ferro-manganese ore, suspension roasting, separation and enrichment Download PDFInfo
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- CN117324115A CN117324115A CN202310828351.0A CN202310828351A CN117324115A CN 117324115 A CN117324115 A CN 117324115A CN 202310828351 A CN202310828351 A CN 202310828351A CN 117324115 A CN117324115 A CN 117324115A
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- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000000926 separation method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000725 suspension Substances 0.000 title claims abstract description 36
- 229910000616 Ferromanganese Inorganic materials 0.000 title claims abstract description 29
- 230000005291 magnetic effect Effects 0.000 claims abstract description 92
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 76
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000011572 manganese Substances 0.000 claims abstract description 72
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 72
- 239000012141 concentrate Substances 0.000 claims abstract description 57
- 229910052742 iron Inorganic materials 0.000 claims abstract description 37
- 238000000227 grinding Methods 0.000 claims abstract description 23
- 238000000498 ball milling Methods 0.000 claims abstract description 16
- 238000007885 magnetic separation Methods 0.000 claims abstract description 16
- 230000005415 magnetization Effects 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 230000002000 scavenging effect Effects 0.000 claims description 39
- 230000009467 reduction Effects 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000006148 magnetic separator Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000001238 wet grinding Methods 0.000 claims description 3
- 239000002516 radical scavenger Substances 0.000 claims description 2
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 7
- 239000011707 mineral Substances 0.000 abstract description 7
- 239000012535 impurity Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 241000305492 Gastrodia Species 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000005243 fluidization Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 6
- 229910001608 iron mineral Inorganic materials 0.000 description 6
- 235000010755 mineral Nutrition 0.000 description 6
- 229910001655 manganese mineral Inorganic materials 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 230000005294 ferromagnetic effect Effects 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 241001358279 Malaya Species 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 241000201912 Suaeda Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000011656 manganese carbonate Substances 0.000 description 1
- 235000006748 manganese carbonate Nutrition 0.000 description 1
- 229940093474 manganese carbonate Drugs 0.000 description 1
- 150000002697 manganese compounds Chemical class 0.000 description 1
- 229940099596 manganese sulfate Drugs 0.000 description 1
- 239000011702 manganese sulphate Substances 0.000 description 1
- 235000007079 manganese sulphate Nutrition 0.000 description 1
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 1
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 229960001841 potassium permanganate Drugs 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C22B1/02—Roasting processes
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B11/00—Feed or discharge devices integral with washing or wet-separating equipment
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for pre-enriching, suspension roasting, separation and enrichment of ferro-manganese ore, which belongs to the technical field of suspension fluidization roasting in metallurgy and mineral processing, and comprises the steps of semi-self-grinding closed circuit grinding, ball milling open circuit grinding, full-size-grade strong magnetic pre-selection, suspension magnetization roasting, graded vertical stirring grinding and weak magnetic separation, wherein the pre-tailing of ferro-manganese ore impurities is realized to synchronously enrich ferro-manganese, the suspension magnetization roasting synchronously reduces magnetic modification, and the separation and enrichment of ferro-manganese ore are realized by utilizing magnetic difference to realize the separation and enrichment of the ferro-manganese ore, so that high-grade and high-recovery manganese concentrate and iron concentrate are obtained; through practical industrial application tests, the method has the characteristics of high resource utilization rate, low carbon, environmental protection, high automation level and the like, realizes the efficient recycling of multiple components of resources, has wide applicability, can be widely applied to iron-containing manganese ores in most areas such as Zanbia, malaysia, gastrodia, south Africa, russia, china and the like, and has very wide popularization prospect and remarkable social and economic benefits.
Description
Technical Field
The invention belongs to the technical field of metallurgical and mineral processing suspension fluidization roasting, and particularly relates to a method for pre-enriching iron-manganese ore, suspension roasting, separation and enrichment.
Background
Manganese is an element of group seven of the fourth period of the periodic table. Manganese has valence states II, III, IV and VII in nature, with valence states II and IV being most common. Manganese is very susceptible to oxidation in air. Manganese has strong philic properties in the earth's rock ring and in the merle of the silicate phase, but strong philic properties in the upper part of the rock ring, manganese has many similar chemical properties to iron in the rock ring and in the merle, but manganese is not as philic.
Manganese is an indispensable raw material for the steel industry, and manganese element is an important additive element in steel products, and has a close relationship with steel production. The manganese-free steel is characterized in that more than 90-95% of manganese is used in the steel industry, manganese is used in the metallurgical industry to manufacture special steel containing manganese, and the hardness, the ductility, the toughness, the wear resistance and the like can be improved by adding a small amount of manganese into the steel. Manganese steel is a necessary material for manufacturing machines, ships, vehicles, rails, bridges, large plants. When in steelmaking, the ferromanganese alloy is also used as a reducing agent for deoxidizing and desulfurizing, and improves the quality and the yield of steel.
Except for the basic requirements of the steel industry, the rest 10% -5% of manganese is used in other industrial fields. Such as manganese, copper, nickel, aluminum, cobalt, etc. to make various alloys for manufacturing mechanical parts, equipment for aircraft and ships, standard resistance wires, etc.; pyrolusite (manganese dioxide powder) is used as a negative agent for batteries, as an oxidizing agent and glazing in ceramic, enamel production, and in glass production to eliminate green and make decorative glass. Manganese compounds, such as manganese sulfate, manganese carbonate, potassium permanganate, etc., are important raw materials for chemical reagents, medicines, dyes, paints, synthetic industries, etc.; such as the chemical industry (manufacturing various manganese-containing salts), the light industry (for batteries, matches, lacquers, soaps, etc.), the building material industry (colorants and depigments for glass and ceramics), the defense industry, the electronics industry, and the environmental and agriculture industries, etc. In summary, manganese has a very important strategic position in national economy.
The world manganese ore resources are extremely unbalanced in distribution; more than 95% of manganese ore reserves are concentrated in a few countries such as south africa, russia, galbana, australia, brazil, india, etc. Wherein the south African manganese ore reserves are the most, accounting for 42.8% of the total world reserves, the Russian manganese ore reserves are the second, accounting for 37.9% of the total world reserves, the Australian manganese ore reserves are 8.7% of the total world reserves, the Suaeda manganese ore reserves are 4.6% of the total world reserves, the Brazilian manganese ore reserves are 2.4% of the total world reserves, and the Indian manganese ore reserves are 1.5% of the total world reserves; manganese ore reserves in other countries account for 2.1% of the total world reserves.
The manganese ore resources in China are approximately 5 hundred million tons, but only 1.27 hundred million tons can be economically exploited and utilized at present, wherein 93 percent of the manganese ore resources are lean manganese ores (the average manganese content is 22 percent), namely refractory fine-grained lean manganese ores. The distribution of the production area is also uneven, and the production area is mainly distributed in Guangxi provinces, hunan provinces, guizhou provinces, sichuan provinces, yunnan provinces, liaoning provinces and the like.
According to the research of separation methods of mineral separation processes, manganese ores are divided into five categories: common manganese oxide ore, carbonate manganese ore, iron manganese ore, manganese-containing iron ore, and multi-metal complex manganese ore.
The ferro-manganese ore is mainly manganese, and the total amount of manganese and iron is more than 30 percent. The technology of beneficiation of such ores is currently still under investigation, and such ores are mainly distributed in india, russia and other countries. Because the density and specific magnetization coefficient of iron mineral and manganese mineral in the iron-manganese ore are similar, and the two are in close symbiosis, the embedding granularity is extremely fine, therefore, the iron-manganese ore is more difficult to be selected than the common manganese oxide ore. The conventional flotation, gravity separation, strong magnetic separation and other mechanical beneficiation methods are adopted, so that manganese concentrate with high manganese content and low iron content is difficult to obtain.
At present, in the world, mechanical beneficiation methods and processes for refractory low-grade ferro-manganese ores tend to be combined processes consisting of a plurality of beneficiation methods: strong magnetic separation-floatation-gravity combined flow, jigging-wet strong magnetic separation, oxidation reduction-acid leaching-magnetic separation, ore washing-jigging-strong magnetic separation-floatation, roasting-gravity separation-weak magnetic separation, strong magnetic roughing-jigging concentration-strong magnetic scavenging and the like. Because many factories are located in the environment-friendly area, flotation, chemical leaching and other processes are not suitable for sorting when ore is treated in order to avoid environmental pollution. Because the densities and specific magnetization coefficients of the ferro-manganese ore, the useful mineral iron mineral containing the ferro-manganese ore and the manganese mineral are similar, and the ferro-manganese ore and the manganese mineral are compact in symbiosis and fine in embedding granularity, the ferro-manganese ore is more difficult to be selected than the common manganese oxide ore. The gangue minerals of the ore mainly exist in the form of quartz or silicate. Therefore, to obtain high-grade manganese concentrate, silicon-containing minerals must be effectively removed to achieve effective separation of manganese and iron, and the above conventional separation method is difficult to achieve efficient separation of iron and manganese, so that it is difficult to obtain high-grade manganese concentrate.
Disclosure of Invention
The invention aims to provide a method for pre-enriching, suspension roasting, separation and enrichment of ferromanganese ores, which adopts the technological processes of semi-autogenous grinding, ball milling, strong magnetic pre-selection, suspension roasting, vertical grinding and weak magnetic separation so as to realize the efficient development and utilization of ferromanganese ore resources.
The method for pre-enriching iron-manganese ore, suspension roasting, separation and enrichment comprises the following steps:
the method comprises the steps of pre-enriching and tailing discarding of ferromanganese ore
Wet grinding raw ore to the fineness of-200 meshes with the content of 20% by semi-self-grinding to obtain mill discharge, wherein the mill discharge is classified by adopting a linear vibration sieve, and then returned to the semi-self-grinding through a belt on the sieve, and the undersize automatically flows to a pump pool to be conveyed to a cyclone for classification; returning the sand setting of the cyclone to ball milling and regrinding to obtain a ball milling product; carrying out low-intensity magnetic separation on overflow of the hydrocyclone and the ball-milling product; separating the weak magnetic tailings by a slag separating sieve, returning the weak magnetic tailings to ball milling on the sieve, and performing strong magnetic roughing under the sieve; performing strong magnetic scavenging on the obtained strong magnetic roughing tailings, concentrating and filtering the scavenging tailings, and skimming the scavenging tailings as final tailings; mixing the weakly magnetic concentrate, the strongly magnetic rough concentrate and the strongly magnetic scavenger concentrate, concentrating and filtering to obtain a preselected concentrate;
suspension magnetization roasting of the material
Pretreating the pre-selected concentrate, and then feeding the pretreated concentrate into a suspension magnetization roasting furnace to obtain calcine after preheating, heating and reduction;
separation and enrichment of iron and manganese
The calcine is pumped into a cyclone for classification by a slurry pump after being stirred by a stirring tank, classified sand setting is ground and classified by a vertical stirring mill, the obtained overflow is subjected to rough concentration, fine concentration, separation and filtration to obtain iron concentrate, and the overflow is subjected to rough concentration, scavenging, concentration and filtration to obtain manganese concentrate.
Further, the semi-autogenous grinding in the step (1) adopts a linear vibration double-layer screen, and the size of a lower layer screen hole of the linear vibration double-layer screen is 2-6mm.
Further, in the step (1), more broken steel balls are on the screen of the linear vibration double-layer screen, and an iron removing device is additionally arranged on a belt for returning the screen to the semi-self-grinding.
Further, the weak magnetic separation magnetic field intensity in the step (1) is 1500-3000Oe; the intensity of the strong magnetic roughing magnetic field is 5000-9000Oe; the strong magnetic scavenging field strength is 6000-10000Oe.
Further, the pre-treated concentrate in the step (2) has a mass percentage concentration of <10% and a fineness-200 mesh content of 50% -70%.
Further, the effective reducing components of the reducing gas in the step (2) are CO and H 2 The concentration of the reducing gas is more than or equal to 40 percent.
Further, the preheating temperature in the step (2) is 250-550 ℃ and the preheating time is 2-5 min; heating at 600-700 deg.c for 1-3 min; the reduction temperature is 520-620 ℃, the reduction time is 20-40min, and the excess coefficient of the reducing gas is not less than 1.5.
Further, the cyclone in the step (3) is screwed to a small-diameter cyclone with the concentration of 30% -40%, the diameter of the cyclone is smaller than that of a small-diameter cyclone with the specification of phi 350mm, the ore grinding concentration is 65% -75%, and the overflow concentration is 23% -29%.
Further, the magnetic separator for rough concentration, fine concentration and scavenging in the step (3) is a permanent magnet weak magnetic separator, a semi-countercurrent box body is selected, the magnetic system wrap angle of the magnetic separator is 130-140 degrees, and the separation gap is 35-45 mm; the rough concentration magnetic field strength is 1500-2500Oe, the fine concentration magnetic field strength is 1500-2000Oe, and the scavenging magnetic field strength is 2500-4000Oe.
Further, TFe in the iron concentrate is 65% -68%, TMn is 2% -4%, and iron recovery rate is 90% -95%; TMn in the manganese concentrate is 50% -55%, TFe is 3% -6%, and manganese recovery rate is 78% -83%.
The invention has the beneficial effects that:
(1) The pre-enrichment process adopts semi-self-grinding-ball milling-one-stage weak magnetic separation-one-stage strong magnetic roughing-one-stage strong magnetic scavenging; the suspension magnetization roasting realizes synchronous reduction of iron minerals and manganese minerals of iron-containing manganese ores through heat accumulation reduction and deep conversion of manganese concentrate; the separation adopts graded vertical stirring grinding, one-section weak magnetic rough separation, one-section weak magnetic fine separation and one-section weak magnetic scavenging. By the process method, the pre-casting tailing of the ferro-manganese ore is realized, and synchronous reduction and efficient separation and enrichment are realized.
(2) According to the requirements of iron-manganese ore properties and charging granularity characteristics, the pre-enrichment system is designed to adopt a one-stage semi-self-grinding closed circuit grinding-ball milling open circuit grinding-full-size-fraction charging process, and the process is beneficial to reducing the excessive grinding of the grinding, reducing the grinding fineness and reducing the content of fine-size fractions in the grinding products, so that the quality (grade, granularity and moisture) of the pre-selected concentrate products can meet the charging requirements of the suspension magnetization roasting furnace.
(3) The method has the characteristics of high resource utilization rate, low carbon, environmental protection, high automation level and the like, realizes the multi-component efficient recycling of resources, is suitable for iron-containing manganese ores in most areas such as Zanbi, malaya, gastrodia, south Africa, russia, china and the like, and has wide popularization prospect and remarkable benefit.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In the description of the present invention, it is to be noted that the specific conditions are not specified in the examples, and the description is performed under the conventional conditions or the conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The process flow chart of the method for pre-enriching, suspension roasting, separation and enrichment of the iron-manganese ore in the embodiment of the invention is shown in figure 1.
In the embodiment of the invention, a mill adopted for the pre-enrichment and tailing discarding of the ferromanganese ore is an overflow type or grid type ball mill, and a cyclone adopts a short cone cyclone or a flat bottom structure cyclone.
In the embodiment of the invention, a vertical stirring mill is selected as a mill for separating and enriching iron and manganese.
Example 1
The method for pre-enriching iron-manganese ore, suspension roasting, separation and enrichment comprises the following steps:
the method comprises the steps of pre-enriching and tailing discarding of ferromanganese ore
Feeding raw ore grade TFe 45.00% and TMn 15.32% ferro-manganese ore to a raw ore bin by a scraper, feeding the raw ore to a belt conveyor by a feeder below the bin, wet grinding the raw ore by a semi-autogenous mill, classifying ore pulp with fineness of-200 meshes of 20% by controlling a linear vibrating screen, and returning the ore pulp to the semi-autogenous mill by a return belt on the screen; the mixture is conveyed from the screen bottom to a pump pool through a slurry pump to be graded by a cyclone, the settled sand of the cyclone returns to ball milling to obtain a ball milling product, overflow of the cyclone automatically flows to a weak magnetic separation ore box, the ball milling product is discharged to the pump pool and pumped to the weak magnetic separation ore box through a slurry pump, the ball milling product and the overflow of the cyclone are fed to a weak magnetic separator together for magnetic separation, the magnetic main magnetic poles of the magnetic separator are 7 poles, the separation gap of the magnetic separator is 46mm, the magnetic offset angle is 10 degrees, the magnetic offset angle is 135.3 degrees, the ore discharging mode at the concentrate end is an ore discharging water and magnetic roller guiding auxiliary combined ore discharging mode, and the magnetic field strength of the weak magnetic separation is 2688Oe;
a small amount of ferromagnetic minerals in the ore are selected by the low-intensity magnetic separator, the low-intensity magnetic separation tailings are pumped into a slag separation sieve to separate slag, the sieve is returned to ball milling and regrinding, the sieve flows under the sieve to a vertical ring ferromagnetic machine to carry out ferromagnetic roughing, the roughing operation concentration is 30%, the rotating ring revolution is 3.0 r/min, the pulse flushing frequency is 250 r/min, and the ferromagnetic roughing magnetic field strength is 7000Oe; feeding the strong magnetic roughing tailings into a vertical ring strong magnetic machine for strong magnetic scavenging, wherein the scavenging concentration is 9.2%, the rotating ring revolution is 3.3 r/min, the pulse frequency is 250 r/min, and the strong magnetic scavenging magnetic field strength is 7800Oe;
the weak magnetic concentrate, the strong magnetic rough concentration concentrate and the strong magnetic scavenging concentrate are mixed, pumped to a thickener for concentration, and then pumped to a vacuum disc filter for filtration to obtain the preselected concentrate, thus obtaining indexes of 47.25 percent of TFe, 15.80 percent of TMn, 96.22 percent of iron recovery rate and 94.54 percent of manganese recovery rate of the preselected concentrate.
And concentrating the strong magnetic scavenging tailings by a thickener, and then pumping the concentrated strong magnetic scavenging tailings to a plate-frame filter for filtering, wherein the filtered tailings are used as roadbed materials for paving roads.
Suspension magnetization roasting of the material
The pre-selected concentrate with fineness of-200 meshes, content of 61.5% and moisture of 7.6% is dropped into a belt conveyor from a pre-selected concentrate bin through a side discharge activation feeder to be fed into a suspension roasting furnace, and the pre-selected concentrate is preheated, heated and reduced at a preheating temperature of 450 ℃ for 3min, a heating temperature of 650 ℃ for 2min and mixed with CO and H in a suspension state 2 Mixing and reducing CO+H 2 Wherein the reduction temperature is 615 ℃, the reduction time is 29min, calcine is obtained after the reduction is completed, iron-manganese ore is reduced from refractory weak magnetic iron ore to easy-to-select strong magnetic magnetite after suspension magnetization roasting, the manganese ore still keeps the weak magnetic property, and the activity of the manganese ore is far stronger than that of the iron ore, and the reducing agents CO and H are used for reducing the manganese ore 2 Firstly, the manganese reacts with manganese mineral, and CO and H remained after high-valence manganese is changed into low-valence manganese 2 To make Fe with weak magnetism 2 O 3 Reduction to Fe 3 O 4 The excess coefficient of the reducing gas is 1.58, and the burning loss is 3.54%;
separation and enrichment of iron and manganese
Pumping the calcine into a cyclone by a slurry pump after the calcine is stirred by a stirring tank for classification, wherein the cyclone is screwed into a small-diameter cyclone with the concentration of 32.4%, the diameter of the cyclone is smaller than that of a small-diameter cyclone with the specification of phi 350mm, the ore grinding concentration is 67.5%, and the overflow concentration is the roughing concentration of 25.2%; the classified sand setting is returned to the vertical mill for regrinding, the iron ore concentrate is obtained after the overflow after classification is subjected to rough concentration, fine concentration and separation and filtration, the scavenging concentration of the rough tailings is 11.8%, the scavenging tailings are obtained after scavenging, the manganese ore concentrate is obtained after concentration and filtration of the scavenging tailings, the rough concentration magnetic field intensity is 1838Oe, the fine concentration magnetic field intensity is 1520Oe, and the scavenging magnetic field intensity is 2637Oe. In the process, according to the separation yield and the condition of index component ingredients, the refined tail is integrated into the manganese concentrate, the sweeping is integrated into the iron concentrate, after the pre-enriched concentrate is subjected to phase conversion of suspension magnetization roasting ore, the weak magnetic iron mineral ore phase in the ferromanganese ore is converted into strong magnetic iron mineral, the ferromanganese ore still keeps weak magnetism, and the ferromanganese separation is realized by utilizing the characteristic that the difference of the specific magnetization rates of the iron mineral and the ferromanganese ore is larger. Realizing the utilization of the ferromanganese separating and enriching full components.
Finally, obtaining: iron concentrate TFe 65.09%, TMn 3.82%, iron recovery 93.14%; the manganese concentrate TMn is 50.27%, TFe is 5.79%, and the manganese recovery rate is 78.49%, wherein the manganese-iron ratio in the manganese concentrate is 8.68 and is more than 5, TMn is more than 50%, and the method is very suitable for smelting high-quality steel and ferroalloy.
Example 2
The difference from the method for separating and enriching the iron-manganese ore in the embodiment 1 is that:
the raw ore is as follows: the main impurity components of the ferromanganese ore with grade TFe 44.95 percent and TMn 15.21 percent are SiO 2 。
The weak magnetic separation magnetic field intensity in the step 1 is 2688Oe; the intensity of the strong magnetic roughing magnetic field is 7300Oe; the strong magnetic scavenging field strength is 8500Oe. Through ore grinding-preselection, indexes of 47.09% of the preselect concentrate TFe, 15.50% of TMn, 96.77% of iron recovery rate and 94.16% of manganese recovery rate are obtained.
In the step 2, the heating temperature of the suspension magnetization roasting is 658 ℃, the heating time is 1.5min, the reducing temperature is 595 ℃, the reducing time is 34min, the excess coefficient of the reducing gas is 2.1, and the burning loss is 3.74%;
in the step 3, the roughing concentration is 26.5%, the 200 mesh content is 89.3%, the roughing magnetic field strength is 1838Oe, the selecting concentration is 18.9%, the selecting magnetic field strength is 1520Oe, the scavenging concentration is 12.3%, and the scavenging magnetic field strength is 2637Oe.
Finally, iron concentrate TFe 66.59 percent and TMn 3.52 percent are obtained; manganese concentrate TMn 53.78%, TFe 4.39%, wherein the manganese to iron ratio in the manganese concentrate is 12.25.
Example 3
The difference from the method for separating and enriching the iron-manganese ore in the embodiment 1 is that:
the raw ore is as follows: iron manganese ore with grade TFe 42.20% and TMn 16.10%, and main impurity component of SiO 2 。
The concentration of the strong roughing operation in the step 1 is 27.8%, and the magnetic field strength of the strong magnetic roughing operation is 5800Oe; the concentration of the selected scavenging operation is 10.6%, and the intensity of the strong magnetic scavenging magnetic field is 6700Oe. Through ore grinding-preselection, indexes of 44.50% of the preselect concentrate TFe, 16.50% of TMn, 87.87% of iron recovery and 85.40% of manganese recovery are obtained.
In the step 2, the heating temperature of the suspension magnetization roasting is 665 ℃, the heating time is 1.67min, the reducing temperature is 613 ℃, the reducing time is 32.5min, the excess coefficient of the reducing gas is 1.88, and the burning loss is 3.79%;
in the step 3, the roughing concentration is 28.34 percent, the 200 mesh content is 92.45 percent, the roughing magnetic field strength is 1838Oe, the selecting concentration is 17.7 percent, the selecting magnetic field strength is 1520Oe, the scavenging concentration is 10.38 percent, and the scavenging magnetic field strength is 2637Oe.
Finally obtaining iron concentrate TFe 66.09 percent and TMn 3.37 percent; 50.89% of TMn and 5.00% of TFe are obtained, wherein the manganese-iron ratio of the manganese concentrate is 10.18.
Example 4
The difference from the method for separating and enriching the iron-manganese ore in the embodiment 1 is that:
the raw ore is as follows: the main impurity components of the ferromanganese ore with the grade TFe of 47.96 percent and TMn of 15.80 percent are SiO 2 。
The concentration of the strong roughing operation in the step 1 is 32.3%, and the magnetic field strength of the strong magnetic roughing operation is 7900Oe; the concentration of the selected scavenging operation is 15.3%, and the intensity of the strong magnetic scavenging magnetic field is 9800Oe.
In the step 2, the reduction temperature is 579 ℃, the reduction time is 34.7min, the excess coefficient of the reduction gas is 2.62, and the burning loss is 3.3%;
in the step 3, the roughing concentration is 25.46%, the 200 mesh content is 95.33%, the roughing magnetic field strength is 1838Oe, the selecting concentration is 16.5%, the selecting magnetic field strength is 1520Oe, the scavenging concentration is 12.47%, and the scavenging magnetic field strength is 2637Oe.
Finally obtaining iron concentrate TFe 67.87%, TMn 2.79%; manganese concentrate TMn 53.74%, TFe 3.83%, wherein the manganese to iron ratio in the manganese concentrate is 14.03.
Claims (10)
1. The method for pre-enriching iron manganese ore, suspension roasting, separation and enrichment is characterized by comprising the following steps:
the method comprises the steps of pre-enriching and tailing discarding of ferromanganese ore
Wet grinding raw ore to the fineness of-200 meshes with the content of 20% by semi-self-grinding to obtain mill discharge, wherein the mill discharge is classified by adopting a linear vibration sieve, and then returned to the semi-self-grinding through a belt on the sieve, and the undersize automatically flows to a pump pool to be conveyed to a cyclone for classification; returning the sand setting of the cyclone to ball milling and regrinding to obtain a ball milling product; carrying out low-intensity magnetic separation on overflow of the hydrocyclone and the ball-milling product; separating the weak magnetic tailings by a slag separating sieve, returning the weak magnetic tailings to ball milling on the sieve, and performing strong magnetic roughing under the sieve; performing strong magnetic scavenging on the obtained strong magnetic roughing tailings, concentrating and filtering the scavenging tailings, and skimming the scavenging tailings as final tailings; mixing the weakly magnetic concentrate, the strongly magnetic rough concentrate and the strongly magnetic scavenger concentrate, concentrating and filtering to obtain a preselected concentrate;
suspension magnetization roasting of the material
Pretreating the pre-selected concentrate, and then feeding the pretreated concentrate into a suspension magnetization roasting furnace to obtain calcine after preheating, heating and reduction;
separation and enrichment of iron and manganese
The calcine is pumped into a cyclone for classification by a slurry pump after being stirred by a stirring tank, classified sand setting is ground and classified by a vertical stirring mill, the obtained overflow is subjected to rough concentration, fine concentration, separation and filtration to obtain iron concentrate, and the overflow is subjected to rough concentration, scavenging, concentration and filtration to obtain manganese concentrate.
2. The method for pre-enrichment, suspension roasting, separation and enrichment of iron-manganese ores, which is characterized in that the semi-self-grinding in the step (1) adopts a linear vibration double-layer sieve, and the size of the holes of the lower layer sieve of the linear vibration double-layer sieve is 2-6mm.
3. The method for pre-enrichment, suspension roasting, separation and enrichment of iron-manganese ores, which is characterized in that in the step (1), the number of broken steel balls on a screen of the linear vibration double-layer screen is large, and an iron removing device is additionally arranged on a belt for returning the screen to semi-self-grinding.
4. The method for pre-enrichment, suspension roasting, separation and enrichment of iron-manganese ores according to claim 1, wherein the weak magnetic separation magnetic field strength in the step (1) is 1500-3000Oe; the intensity of the strong magnetic roughing magnetic field is 5000-9000Oe; the strong magnetic scavenging field strength is 6000-10000Oe.
5. The method for pre-enrichment, suspension roasting, separation and enrichment of iron-manganese ores according to claim 1, wherein the pre-treated pre-concentrate in step (2) has a mass percentage concentration of <10% and a fineness of-200 meshes content of 50% -70%.
6. The method for pre-enrichment, suspension roasting, separation and enrichment of iron-manganese ores, according to claim 1, wherein the effective reducing components of the reducing gas in the step (2) are CO and H2, and the concentration of the reducing gas is more than or equal to 40%.
7. The method for pre-enrichment, suspension roasting, separation and enrichment of iron-manganese ores according to claim 1, wherein the preheating temperature in the step (2) is 250-550 ℃ and the preheating time is 2-5 min; heating at 600-700 deg.c for 1-3 min; the reduction temperature is 520-620 ℃, the reduction time is 20-40min, and the excess coefficient of the reducing gas is not less than 1.5.
8. The method for pre-enrichment, suspension roasting, separation and enrichment of iron-manganese ores, which is characterized in that the cyclone in the step (3) is used for rotating the cyclone to have the concentration of 30% -40%, the diameter of the cyclone is selected from small-diameter cyclones with the specification of less than phi 350mm, the ore grinding concentration is 65% -75%, and the overflow concentration is 23% -29%.
9. The method for pre-enrichment, suspension roasting, separation and enrichment of iron-manganese ores, which is characterized in that the magnetic separator for roughing, selecting and scavenging in the step (3) is a permanent-magnet weak magnetic separator, a semi-countercurrent box body is selected, the magnetic system wrap angle of the magnetic separator is 130-140 degrees, and the separation gap is 35-45 mm; the rough concentration magnetic field strength is 1500-2500Oe, the fine concentration magnetic field strength is 1500-2000Oe, and the scavenging magnetic field strength is 2500-4000Oe.
10. The method for iron-manganese ore pre-enrichment-suspension roasting-separation and enrichment according to claim 1, wherein TFe in the iron concentrate is 65% -68%, TMn in the iron concentrate is 2% -4%, and iron recovery rate is 90% -95%; TMn in the manganese concentrate is 50% -55%, TFe is 3% -6%, and manganese recovery rate is 78% -83%.
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| CN117947261A (en) * | 2024-03-26 | 2024-04-30 | 扬州一川镍业有限公司 | Method for treating laterite-nickel ore leaching slag by using suspension magnetization roasting |
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| CN117947261A (en) * | 2024-03-26 | 2024-04-30 | 扬州一川镍业有限公司 | Method for treating laterite-nickel ore leaching slag by using suspension magnetization roasting |
| CN117947261B (en) * | 2024-03-26 | 2024-05-28 | 扬州一川镍业有限公司 | Method for treating laterite-nickel ore leaching slag by using suspension magnetization roasting |
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