WO2018088922A1 - Способ подготовки железорудного концентрата к жидкофазному восстановлению металлов - Google Patents
Способ подготовки железорудного концентрата к жидкофазному восстановлению металлов Download PDFInfo
- Publication number
- WO2018088922A1 WO2018088922A1 PCT/RU2016/000772 RU2016000772W WO2018088922A1 WO 2018088922 A1 WO2018088922 A1 WO 2018088922A1 RU 2016000772 W RU2016000772 W RU 2016000772W WO 2018088922 A1 WO2018088922 A1 WO 2018088922A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- concentrate
- mixture
- lime
- iron ore
- ore concentrate
- Prior art date
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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
Definitions
- the invention relates to the processing of wet finely ground iron ore concentrate or industrial waste in the metallurgical industry, namely, the preparation and drying of iron ore concentrate used in the technological process of continuous liquid-phase metal recovery.
- One of the disadvantages of the known methods is the duration of drying and solidification, eliminating the possibility of their use in the stream of continuous metal production.
- a method of drying finely ground iron ore concentrate involves mixing a moistened concentrate with a moisture content of 8-12% with quicklime with a grain size of up to 10 mm in a drum or rotary mixer. Quicklime is fed to the mixer in an amount of 40-70 kg / t moistened concentrate with the drying of the mixture in wagons and subsequent transportation to the warehouse, where the mixture is kept in a stack for 2 days.
- the basicity of the obtained sinter concentration is 1.1 1 unit.
- Particle size class 0-0.074 mm in a moistened concentrate is at least 70%.
- the mixture is subjected to loosening in a hammer mill. From special bunkers, the mixture is dosed and the corrective additives of flux and carbon carrier, after which the full mixture is mixed and prepared for sintering on sintering machines.
- the objective of the proposed method for the continuous preparation of wet finely ground iron ore concentrate for liquid-phase reduction of metals is to increase the efficiency of processing a mixture of lime and iron ore concentrate by continuously supplying it to the melting unit.
- a method for continuously preparing wet finely divided iron ore concentrate for liquid-phase metal reduction comprising weighing and mixing the concentrate with lime in a mixer, drying the resulting mixture and holding it to hardening, subsequent crushing of the obtained solid mixture according to the invention, lime is fired before mixing the concentrate and lime a stream of gas leaving the continuous smelting unit, then the lime is ground and the resulting freshly lime powder is mixed with iron ore concentrate in an amount of 75-110 kg per 1 ton of concentrate, the mixture is dried on a conveyor in countercurrent gas containing CO2, leaving the smelter or limestone kiln and cooled to a temperature of 150-200 ° C, until the mixture hardens in a stream, followed by crushing 20-60 minutes after the start of gas blowing, continuously loading the crushed mixture into the liquid slag-ore-metal melt of the melting unit.
- the moisture content in finely ground iron ore concentrate is in the range of 6-20%.
- a mixture of freshly baked lime and iron ore concentrate is dried on a conveyor in an airtight device.
- the gas containing CO2 entering the drying device from the lime kiln is pre-cooled in a waste heat boiler.
- the mixture of lime and the concentrate is dried to a hardening protovotoke gas containing at least 5% C0 2.
- coal is additionally loaded with particle sizes up to 4 mm, while the amount of lime powder is increased to 140 kg per tonne of processed wet concentrate.
- the maximum particle size of lime powder does not exceed 4 mm.
- Lime is fed into the mixer by an injector.
- Continuous loading of the crushed mixture into the liquid slag-ore-metal melt of the melting unit is carried out by a screw feeder with the possibility of changing the feed rate to the melt.
- the basicity of the CaO / SiO slag obtained in the process of metal reduction is maintained in the range of 0.8-0.9 units.
- the slag obtained in the process of metal reduction is processed into fibrous insulating slag materials.
- the proposed calcination of lime in a stream of gas discharged from a continuous smelting unit, produced before mixing the iron ore concentrate and lime increases the productivity of the dehydration process of iron ore concentrate, reduces the consumption of lime for dehydration of the concentrate, and uses the heat of the exhaust gases from the continuous smelting unit at low operating costs.
- the grinding of lime into a powder with a maximum particle size not exceeding 4 mm allows lime to be fed into the mixer with an injector and provides a high rate of dehydration of the wet concentrate, accelerate the mixing process and obtain a mixture of the desired composition.
- the amount of freshly baked lime powder introduced into the wet finely divided iron ore concentrate in the range of 75-110 kg per 1 ton of the processed concentrate makes it possible to ensure the moisture content in the mixture prepared for liquid-phase reduction of metals in the range of 2.8-3.0%.
- the moisture content in the original finely divided ore concentrate is ⁇ 6-20%.
- finely ground iron ore concentrate based on the moisture content in it is preferable in the calculated dependence:
- the required moisture content is provided in the range of 2.8- 3.0%, but the amount and basicity of the slag increases, which leads to a decrease in the productivity of the smelting unit and difficulties in the disposal of the final slag.
- Drying a mixture of lime powder and concentrate on a conveyor in countercurrent gas containing C0 2 , leaving the smelter or lime kiln and cooled to a temperature of 150-200 ° C reduces the solidification time of the prepared mixture.
- the exposure time of the mixture on the conveyor in the drying device before crushing depends on the moisture content in the initial wet finely ground iron ore concentrate. When the moisture content in it is in the range of 10-12%, the exposure time of the mixture to crushing is 20 minutes, with a higher moisture content, for example, in the range from 12 to 20%, the exposure time of the mixture is increased to 60 minutes.
- the exposure time of the mixture on the conveyor in the drying device until crushing, comprising 20-60 minutes corresponds to the technological parameters of the liquid-phase reduction of the metal.
- the mixture hardens to form large pieces containing particles of ore and calcium carbonate CaCO3, they are inconvenient for transportation and loading into the melting unit, so they are transferred to the crusher.
- Crushing the hardened mixture in 20-60 minutes after the start of blowing with CO2-containing gas ensures the fulfillment of technological parameters of the continuous metal production process.
- Crushing the mixture in 15-19 minutes after blowing with CO2-containing gas is difficult, since not all the mixture has time to harden.
- Crushing the mixture for a time exceeding 60 minutes after the start of blowing with CO2-containing gas makes it difficult to conduct a continuous metal production process.
- the loading of the crushed mixture into the melting unit continuously with a screw feeder allows loading the mixture with the possibility of changing the feed rate of the prepared mixture into the melt.
- the particle size of coal up to 4 mm allows you to feed such particles into the mixer with an injector.
- the maximum particle size of lime powder should not exceed 4 mm, which will allow lime to be fed into the mixer with an injector and provide high speed of the dehydration process of the processed wet iron ore concentrate.
- the choice of particle sizes of lime powder more than 4 mm will make it difficult or preclude the possibility of feeding lime with an injector, which will significantly reduce the rate of dehydration of wet iron ore concentrate.
- the implementation of the method of continuous preparation of wet finely ground iron ore concentrate or industrial waste for liquid-phase reduction of metals in a continuous smelter allows to improve the technical and economic indicators of the method: to increase the drying and sintering performance of the mixture in accordance with the technological parameters of the continuous smelter, to reduce the cost of preparing the mixture and recoverable metal, use the waste heat gases for electricity production, lime burning, etc.
- the accompanying drawing shows a flow diagram of the continuous preparation of wet finely ground iron ore concentrate or industrial waste for liquid phase metal reduction.
- the method is carried out in accordance with a flow chart of the continuous preparation of wet finely ground iron ore concentrate or industrial waste for liquid phase metal reduction as follows.
- the hopper 1 serves powder of freshly lime.
- the hopper 2 serves wet finely ground iron ore concentrate.
- dispensers freshly baked lime powder and moist finely ground iron ore concentrate are fed into the mixer 3 in a predetermined required ratio, and the lime powder is injected with an injector. After mixing, the resulting mixture is fed by conveyor 4 to the device 5 for blowing the mixture with chilled gases leaving the smelting unit 9.
- This reaction is exothermic and moisture released from the calcium oxide hydrate evaporates and is removed from the device. As a result of this reaction, large pieces of a mixture of ore particles and calcium carbonate CaCO3 are formed.
- CaCO3 tv -> CaO xv + C0 2 ha 3 and lime is obtained.
- Freshly burnt lime is loaded into a ball mill 12 and ground into a powder with a maximum particle size of 4 mm.
- the resulting powder is transferred by pneumatic transport to the hopper 1 and used for mixing with wet iron ore concentrate.
- the exhaust gases coming from the smelting unit 9 into the limestone kiln 11 and passing through it are passed at a temperature of 1000 ° C to the energy recovery boiler 13, the steam of high parameters obtained in the boiler is used to generate electricity in a steam turbine 14.
- Cooled furnace gas with high content of C0 2 released from the energy recovery boiler 13 is used for blowing the mixture of calcium hydroxide and iron ore concentrate in the device 5. from the device for blowing the mixture gas supplied to the gas cleaning 15.
- the eyes enny dust from the gas exhauster 16 is fed into the chimney 17 and through the tube emit.
- the cast iron is poured into the casting ladle 18 and then used for its intended purpose.
- Waste slag is poured from the melting unit 9 into the slag ladle 19 and then used in the installation 20 to obtain fibrous insulating slag materials.
- Iron ore finely ground concentrate with a moisture content of 15% in an amount of 1 ton in runners was mixed with a powder of freshly ground freshly baked lime in an amount of 100 kg.
- the resulting pasty mixture was loaded into a cylindrical metal container with holes of small diameter (3 mm) and purged in this container with a mixture of air and carbon dioxide (CO 2 - 10%) for 45 minutes.
- the resulting lump of hardened mixture was removed from the container and broken into pieces 20-50 mm in size.
- the mass of the obtained slag was 0.28 tons.
- the content of iron oxides in the slag was 5.2%.
- Patent 2571065 of the Russian Federation The method of drying dusty fine-grained materials and installation for its implementation / L. A. Zainullin, V. G. Karelin, A.Yu. Epishin, D.A. Artov, R.L. Zaynullin, Chen Kai. Patent holder of VNIIMT OJSC, L. Zaynullin
- Nickel in 3 tons T. 1. Development of the nickel industry in the USSR. Preparation of ores and concentrates for metallurgical processing. Enrichment of oxidized nickel ores / I.D. Reznik, Y.M. Schneerson, G.P. Ermakov. - M.: Mechanical Engineering, 2004 .-- 384 p.
- Patent 2350864 of the Russian Federation The disk apparatus for heat treatment of bulk materials / A.M. Kharchenko, Yu.B. Danilov, V.M. Gutorov et al. Patent holders Danilov Yu.B., Kharchenko MA
- Patent 2425155 of the Russian Federation The method of drying finely ground iron ore concentrate / S.A. Napolsky, R.A. Gelbing, A.G. Sukharev. Patent holder of OJSC Vysokogorsky Mining and Processing Plant.
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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
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2019101700A RU2720015C1 (ru) | 2016-11-14 | 2016-11-14 | Способ непрерывной подготовки влажного тонкоизмельченного железорудного концентрата к жидкофазному восстановлению металлов |
PCT/RU2016/000772 WO2018088922A1 (ru) | 2016-11-14 | 2016-11-14 | Способ подготовки железорудного концентрата к жидкофазному восстановлению металлов |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/RU2016/000772 WO2018088922A1 (ru) | 2016-11-14 | 2016-11-14 | Способ подготовки железорудного концентрата к жидкофазному восстановлению металлов |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018088922A1 true WO2018088922A1 (ru) | 2018-05-17 |
Family
ID=62109972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/RU2016/000772 WO2018088922A1 (ru) | 2016-11-14 | 2016-11-14 | Способ подготовки железорудного концентрата к жидкофазному восстановлению металлов |
Country Status (2)
Country | Link |
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RU (1) | RU2720015C1 (ru) |
WO (1) | WO2018088922A1 (ru) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6565623B2 (en) * | 2001-03-20 | 2003-05-20 | Startec Iron Llc | Method and apparatus for curing self-reducing agglomerates |
RU2425155C2 (ru) * | 2009-04-28 | 2011-07-27 | Открытое акционерное общество "Высокогорский горно-обогатительный комбинат" | Способ сушки тонкоизмельченного железорудного концентрата |
CN104805280A (zh) * | 2015-04-30 | 2015-07-29 | 马钢(集团)控股有限公司 | 一种煤基法生产高品质电炉用金属炉料的工艺 |
-
2016
- 2016-11-14 RU RU2019101700A patent/RU2720015C1/ru not_active IP Right Cessation
- 2016-11-14 WO PCT/RU2016/000772 patent/WO2018088922A1/ru active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6565623B2 (en) * | 2001-03-20 | 2003-05-20 | Startec Iron Llc | Method and apparatus for curing self-reducing agglomerates |
RU2425155C2 (ru) * | 2009-04-28 | 2011-07-27 | Открытое акционерное общество "Высокогорский горно-обогатительный комбинат" | Способ сушки тонкоизмельченного железорудного концентрата |
CN104805280A (zh) * | 2015-04-30 | 2015-07-29 | 马钢(集团)控股有限公司 | 一种煤基法生产高品质电炉用金属炉料的工艺 |
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RU2720015C1 (ru) | 2020-04-23 |
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