AU2016304050B2 - Metal ore metal recovery process and metal ore metal recovery process furnace - Google Patents
Metal ore metal recovery process and metal ore metal recovery process furnace Download PDFInfo
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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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
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Abstract
A metal ore metal recovery process and metal ore metal recovery process furnace. The metal ore metal recovery process is performed in a process furnace, which recovers a metal from a metal ore, and comprises a metal mine inlet arranged at an upper portion of the process furnace and a metal mine outlet arranged at a lower portion of the process furnace. The method comprises: inputting a combustion fuel to an upper portion of a recovery area to preheat the metal mine at a preheating area; and inputting a reducing agent gas into the furnace to recover the metal from the preheated metal mine. The method and process furnace can be used to process metal mines recoverable by carbon monoxide and hydrogen, resolving problems of complicated equipment, large investments, a high reduction reaction temperature, and high power consumption of a metal reduction method in the prior art.
Description
Description
Metal ore reduction treatment method and furnace
Technical Field [0001] The present invention relates to the field of metallurgical technologies, and in particular to a method for reducing a metal in a high valence state in metal ore to a low valence state.
Background Art [0002] Most of the metals in nature are present in the compound state, and in order to obtain a compound with a greater metal content or an elementary metal substance, a reduction-enrichment treatment is often required. There are different enrichment methods for different metals; however, the principle of all of these methods is to reduce a metal in a high valence state to a low valence state, for example, reducing CuO to obtain Cu, reducing MnO2 to obtain Mn, and reducing Fe2O3 to obtain Fe.
[0003] An existing metal ore reduction treatment method, such as a technique for reducing MnO2 to obtain Mn2+, relates to respectively grinding coal and a manganese ore of MnO2, then mixing same at a ratio and adding the mixture into a rotary kiln or shaft kiln for calcination at a temperature of 900°C ± 50°C. Most existing iron ore reduction methods also relate to mixing coal with iron ore at a ratio and then calcining same. In addition, in the prior art, there is one technique, the inventions of Reaction device for multi-stage circulation and preheating for fluidized reduction and calcination of iron oxide ore (patent No. ZL 200720064996.8) and Calcination device for reducing hematite, limonite and siderite (patent
No. ZL 200610032484.3), wherein the reduction of iron ore by the two devices is substantially the same, in both cases including introducing high-temperature
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2016304050 03 May 2019 carbon monoxide from the bottom of a metal ore reduction treatment furnace, allowing same to undergo a flash reduction with metal ore in a high-temperature gas flow, and water quenching same into Fe3O4 after the reduction. With regard to this technique, since the reduction of iron ore is rapidly accomplished in a flash reactor, the reaction temperature should be very high; secondly, before the reduction reaction of the iron ore, preheating must be carried out by means of a hot air flow of a multi-stage cyclone cylinder. This type of technical device is relatively complicated, and during the preheating of the multi-stage cyclone cylinder, it is difficult to maintain the temperature thereof, and the heat consumption thereof is relatively large. Furthermore, since the iron ore needs to undergo flow preheating between multi-stage cyclones prior to reduction, the iron ore needs to be ground to a smaller particle size prior to preheating. All these aspects cause the process to have a large energy consumption and a high cost.
[0004] A technical problem is to provide a metal ore reduction treatment method and a metal ore reduction treatment furnace that may solve the problems that existing metal reduction methods have, i.e., the problems of a complex device, a large investment, a high reduction reaction temperature and a high energy consumption.
Summary [0005] The present invention provides a metal ore reduction treatment method, wherein:
a reduction reaction of a metal ore is carried out in a metal ore reduction treatment furnace, said metal ore reduction treatment furnace being provided with:
a metal ore inlet at the top and a metal ore outlet at the bottom;
reducing gas outlets between said metal ore inlet and said metal ore outlet, said reducing gas outlets being for
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2016304050 18 Jun 2019 discharging a reducing gas into the metal ore reduction treatment furnace; and combustion-supporting gas outlets between said metal ore inlet and said reducing gas outlets, said combustion-supporting gas outlets being for discharging a combustion-supporting gas into the metal ore reduction treatment furnace, said combustionsupporting gas being air; wherein:
the metal ore reduction treatment furnace has a preheating zone above said combustion-supporting gas outlets;
the metal ore reduction treatment furnace has a reduction zone located between said reducing gas outlets and said combustion-supporting gas outlets;
the reducing gas discharged from said reducing gas outlets reacts with metal ore deposited in the reduction zone; and the combustion-supporting gas discharged from said combustion-supporting gas outlets supports combustion in said metal ore reduction treatment furnace to preheat metal ore deposited in the preheating zone.
[0006] In the above-mentioned metal ore reduction treatment method, said metal ore may be any one of metal ores reducible with carbon monoxide and hydrogen, in particular iron ore, manganese ore or copper ore.
[0007] The above-mentioned metal ore reduction treatment method has a preferred embodiment in which the particle size of said metal ore is 30 mm or less; the temperature of a reaction zone between said reducing gas outlets and said combustion-supporting gas outlets is 120-780°C; the metal ore having passed through said reaction zone is discharged from the metal ore outlet of said metal ore reduction treatment furnace, and the discharged metal ore may directly enter a cooling liquid for cooling, or may also be cooled in another environment that prevents same from being oxidized again. The metal ore, having passed through the reaction zone, may also be cooled in a cooling zone provided in said metal
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2016304050 18 Jun 2019 ore reduction treatment furnace and then discharged from the metal ore outlet, and this cooling zone may be arranged between said reducing gas outlets and the metal ore outlet of said metal ore reduction treatment furnace. In a preferred embodiment, a gas cooler and a water cooler are provided in said cooling zone, such that said combustion-supporting gas can be preheated by said gas cooler and then sent to said combustion-supporting gas outlets so as to support combustion. In an embodiment where said reducing gas is selected from water coal gas (water gas), said water cooler is a heat exchanger for producing steam for said water coal gas generator, and said water coal gas from said water coal gas generator is input into said metal ore reduction treatment furnace through said reducing gas outlets.
[0008] In the above-mentioned metal ore reduction treatment furnace, said reducing gas outlets are distributed at the junction of said reduction zone and said cooling zone of said metal ore reduction treatment furnace; and said combustion-supporting gas outlets are distributed at the junction of said preheating zone and said reaction zone of said metal ore reduction treatment furnace .
[0009] The metal ore reduction treatment furnace as described in the present invention refers to an oxidation-reduction reaction furnace wherein, after normal operation, metal ore to be reduced can be continuously input into the furnace, and metal ore, which has undergone the reduction reaction, can be continuously output to outside the furnace.
[0010] The metal ore reduction treatment furnace used for this metal ore reduction treatment method may be such a furnace, wherein the furnace is provided with:
a metal ore inlet at the top and a metal ore outlet at the bottom;
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2016304050 18 Jun 2019 reducing gas outlets between said metal ore inlet and said metal ore outlet, said reducing gas outlets being for discharging a reducing gas into the metal ore reduction treatment furnace, said reducing gas being water gas;
combustion-supporting gas outlets between said metal ore inlet and said reducing gas outlets, said combustion-supporting gas outlets being for discharging a combustion-supporting gas into the metal ore reduction treatment furnace, said combustionsupporting gas being air; and a gas cooler and a water cooler in a cooling zone between said reducing gas outlets and said metal ore outlet; wherein:
the gas cooler is configured for cooling metal ore passing through the cooling zone using a combustion-supporting gas and thereby preheating the combustion-supporting gas;
the water cooler is configured for cooling metal ore passing through the cooling zone using water and thereby generating steam;
an outlet of said gas cooler is in communication with said combustion-supporting gas outlets for passing pre-heated combustion-supporting gas from the gas cooler to said combustionsupporting gas outlets;
an outlet of said water cooler is in communication with a water gas generator for passing steam from the water cooler to said water gas generator; and said water gas generator is configured for providing water gas to the reducing gas outlets..
[0011] The present invention may provide the following beneficial effects:
[0012] 1. since the reducing gas is added into a metal ore reduction treatment furnace with a metal ore inlet at the top and a metal ore outlet at the bottom, and in the reaction zone, the reducing gas and the metal ore move in opposite directions, the progress of the reduction of the metal ore can achieve a desired effect;
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2016304050 18 Jun 2019 [0013] 2. compared with the prior art of mixing coal with an ore and subjecting same to a reduction reaction at a temperature of 900 °C, the reaction temperature of this technique can be reduced to as low as 780°C or less, or even as low as 120°C, reducing the heat loss caused by factors that cause the heating temperature of the metal ore to be high; the problem of coking resulting from high-temperature calcination, which results in the subsequent crushing beneficiation being difficult and affects the separation rate, can also be avoided; due to the addition of the combustion-supporting gas, the remaining reducing gas, having passed through the reduction zone, is completely combusted for preheating the metal ore before participating in the reduction reaction, such that the evacuation and waste of the reducing gas can be prevented; moreover, a high-concentration reducing gas can
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2016304050 03 May 2019 be introduced, which facilitates accelerating the progress of the reduction of the metal;
[0014] 3. compared with the prior art similar to Calcination device for reducing hematite, limonite and siderite (patent No. ZL 200610032484.3), this technique does not require the grinding of the metal ore in the hard state before reduction, and the metal ore does not have to be ground extremely finely, which can save on process costs; secondly, the reducing device is relatively simple, the number of devices is small, and the equipment investment is low; furthermore, the floor area is also relatively small, contributing to thermal insulation and facilitating reducing energy consumption. It is understood that, in the prior art, the energy consumption for the reduction treatment of iron ore is not less than 100 kg of standard coal/ton, whereas the energy consumption for the treatment of the same type of iron ore by the invention can be as low as 50 kg of standard coal/ton.
Description of the Drawings [0014A] Various embodiments of the present invention are described herein, by way of example only, with reference to the following drawings:
[0015] Figure 1 is a schematic structural view of a metal ore reduction treatment furnace used in Examples 1 to 9 of the method of the present invention.
[0016] Figure 2 is a front view of a combustion-supporting gas distribution pipeline and a reducing gas distribution pipeline in the present invention.
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2016304050 03 May 2019 [0017] Figure 3 is a top view of the combustion-supporting gas distribution pipeline and the reducing gas distribution pipeline in the present invention.
[0018] Figure 4 is a partial enlarged view of A in figure 3.
[0019] Figure 5 is a schematic structural view of the metal ore reduction treatment furnace used in Example 10 of the present invention .
Detailed Description of Embodiments [0020] Example 1 -- Method for the reduction treatment of hematite :
[0021] The device used for the reduction of the metal ore in this example, as shown in figure 1, has a metal ore reduction treatment furnace, wherein the upper end of the metal ore reduction treatment furnace has a feed hopper 1, there is a flue gas outlet between the feed hopper 1 and a furnace shell 2 of the metal ore reduction treatment furnace, an upper end inlet of the feed hopper 1 is a metal ore inlet for the metal ore to be reduced in the metal ore reduction treatment furnace, a lower end of the metal ore reduction treatment furnace is connected with a screw conveyor 16 via a collection hopper portion, a metal ore outlet of the screw conveyor 16 is the metal ore outlet of the metal ore reduction treatment furnace, and metal ore which has undergone the reduction reaction is discharged to outside the furnace from here.
[0022] The metal ore reduction treatment furnace is provided with a combustion-supporting gas distribution pipeline 5 and a reducing gas distribution pipeline 7, wherein reducing gas outlets on the reducing gas distribution pipeline 7 are arranged between the metal ore inlet and the metal ore outlet of the metal ore reduction treatment furnace; and combustion-supporting gas outlets
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2016304050 03 May 2019 on the combustion-supporting gas distribution pipeline 5 are arranged between the metal ore inlet and the reducing gas outlets of the metal ore reduction treatment furnace. The combustion-supporting gas distribution pipeline 5 and the reducing gas distribution pipeline 7 divide the interior of the metal ore reduction treatment furnace into a preheating zone Tl, a reaction zone T2 and a cooling zone T3, wherein the preheating zone Tl is an area between the outlet of the feed hopper 1 and the combustion-supporting gas distribution pipeline 5, the reaction zone T2 is an area between the combustion-supporting gas distribution pipeline 5 and the reducing gas
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PCT/CN2016/092400 distribution pipeline 7, and the cooling zone T3 is an area between the reducing gas distribution pipeline 7 and the lower end of the collection hopper portion of the metal ore reduction treatment furnace, i.e., the combustion-supporting gas distribution pipeline 5 is mounted at the junction of the preheating zone T1 and the reduction zone T2 and the reducing gas distribution pipeline 7 is mounted at the junction of the reaction zone T2 and the cooling zone T3.
[0023] Inside the furnace shell 2, a distributor mainly composed of a conical cylinder 3, the height position of which is adjustable, is mounted in the upper portion of the preheating zone Tl; inside the furnace shell 2, a gas cooler 8 is mounted in the upper portion of the cooling zone T3, an inlet of the gas cooler 8 is connected, via a pipe 9, to an air outlet of a blower 10 provided with a control damper at the inlet of same, and an outlet of the gas cooler 8 is connected, via a pipe 6, to the inlet, i.e. the combustion-supporting gas inlet, of the combustionsupporting gas distribution pipeline 5; inside the furnace shell 2, a water cooler 13 is mounted in the lower portion of the cooling zone T3, an inlet of the water cooler 13 is connected to a tap water pipe 15 with a valve, and an outlet of the water cooler 13 is connected, via a pipe 12, to a steam inlet of a water coal gas generating furnace 14; and [0024] a water coal gas outlet of the water coal gas generating furnace 14 is connected, via a pipe 11, to the reducing gas inlet of the metal ore reduction treatment furnace, i.e., the inlet of the reducing gas distribution pipeline 7.
[0025] The combustion-supporting gas distribution pipeline 5 and the reducing gas distribution pipeline 7 in this example are structurally the same, with the structures of same being as shown in figure 2 to figure 4, wherein there is a main pipe 21, fourteen branch pipes 22 are respectively transversely arranged on the
WO 2017/020789
PCT/CN2016/092400 two opposite sides of the main pipe 21, and one side of each branch pipe 22, i.e., the side facing downward in figure 1, is respectively provided with a plurality of gas outlet pipes 23. One end of the main pipe 21 is open as a combustion-supporting gas inlet and the other end thereof is closed; one end of each branch pipe 22 is in communication with the main pipe and the other end thereof is closed; and one end of each gas outlet pipe 23 is in communication with the branch pipe to which same is connected, and the other end thereof is open as a combustion-supporting gas outlet.
[0026] The method for the reduction treatment of limonite of this example is as follows:
[0027] before the limonite enters the hopper 1 of the metal ore reduction treatment furnace, block-shaped limonite is firstly ground and sieved to obtain a metal ore 4 to be reduced which has a particle size of less than 30 mm, and then the metal ore 4 to be reduced is sent to the hopper 1 in figure 1 via an elevator.
[0028] Air blown out of the blower 10 serves as the combustion-supporting gas used in this metal ore reduction treatment method. The combustion-supporting gas enters via the pipe 9 and passes through the gas cooler 8, which is mainly composed of a spiral pipe, in the metal ore reduction treatment furnace, such that the combustion-supporting gas, having passed through the gas cooler 8, is heated while the metal ore 4 outside the gas cooler 8 is cooled. The heated combustion-supporting gas further passes through the pipe 6 and the combustion-supporting gas distribution pipeline 5 and is discharged from the combustionsupporting gas outlets of the combustion-supporting gas distribution pipeline 5, and the discharged combustionsupporting gas is mixed, for combustion, with the unreacted reducing gas from the upper end of the reaction zone T2, the heat generated being used for preheating the metal ore 4 in the preheating zone T1. Adjusting the height of the conical cylinder 3 in the
WO 2017/020789
PCT/CN2016/092400 preheating zone T1 can adjust the stack height of the metal ore 4 in the preheating zone Tl, such that the metal ore 4 achieves a desired preheating effect and the waste of heat can be prevented.
[0029] The water coal gas generating furnace 14 adjusts the concentration and output quantity of carbon monoxide and hydrogen in the water coal gas obtained thereby by means of controlling the quantity of input coal and the quantity of input steam. The water coal gas generated by the water coal gas generating furnace 14 serves as the reducing gas in this metal ore reduction treatment method, and the reducing gas is input to the metal ore reduction treatment furnace via the pipe 11 and the reducing gas distribution pipeline 7 and undergoes an oxidation-reduction reaction with the metal ore 4 in the reaction zone T2 of the metal ore reduction treatment furnace so as to reduce the metal ore 4. The results of this example and a number of various practices carried out by the inventors, including the examples of the present invention as described below, show that the higher the concentration of carbon monoxide and hydrogen in the reducing gas, the better the reducing effect achieved by the metal ore 4 .
[0030] Tap water is input to the water cooler 13, which is mainly composed of a spiral pipe, in the metal ore reduction treatment furnace via the tap water pipe 15, and the water flowing through the water cooler 13 is converted into steam by the heat and is input into the water coal gas generating furnace 14 via a pipe 12 so as to produce water coal gas; furthermore, the water flowing through the water cooler 13 further cools the metal ore 4 outside the water cooler 13, and adjusting the tap water valve can control the output of steam and the degree of cooling of the metal ore 4. After being cooled to such an extent that the re-cooled metal ore 4 does not undergo re-oxidation with air, same can be discharged outside the metal ore reduction treatment
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2016304050 03 May 2019 furnace via a screw conveyor 16. The reaction temperature in the reaction zone T1 can be adjusted by controlling the rate of discharge of the metal ore 4 from the screw conveyor 16, and the water coal gas generating furnace 14 adjusts the concentration and output quantity of carbon monoxide and hydrogen in the water coal gas obtained thereby by means of controlling the quantity of input coal and the quantity of input steam. The water coal gas generated by the water coal gas generating furnace 14 serves as the reducing gas in this metal ore reduction treatment method, and the reducing gas is input to the metal ore reduction treatment furnace via the pipe 11 and the reducing gas distribution pipeline 7 and undergoes an oxidation-reduction reaction with the metal ore 4 in the reaction zone T2 of the metal ore reduction treatment furnace so as to reduce the metal ore 4. The results of this example and a number of various practices carried out by the inventors, including the examples of the present invention as described below, show that the higher the concentration of carbon monoxide and hydrogen in the reducing gas, the better the reducing effect achieved by the metal ore 4.
Examples of the Present Invention [0031] Example 2 to Example 9 relate to methods for the reduction treatment of different metal ores using different reaction temperatures:
[0032] In these examples, with the exception of the type of metal ore and the reaction temperature being different from those of Example 1, the other parts are the same as those in Example 1.
[0033] The treatment effects of these examples are as shown in the table below:
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| Ex amp le 1 | Exampl e 2 | Ex amp le 3 | Ex amp le 4 | Ex amp le 5 | Ex amp le 6 | Ex amp le 7 | Ex amp le 8 | Ex amp le 9 | |
| Metal ore type | Hemat ite | Hemati te | Hemat ite | Psilo melan e | Psilo melan e | Psilo melan e | Coppe r ore | Coppe r ore | Coppe r ore |
| Temperatur e in reaction zone (°C) | 120 | 360 | 780 | 120 | 360 | 780 | 120 | 360 | 780 |
| Metal ore treatment yield (ton/hour) | 2.45 | 2.83 | 2.95 | 1.05 | 1.18 | 1.22 | 2.01 | 2.88 | 3.02 |
| Energy consumptio n (kg of standard coal/ton) | 48 | 45 | 55 | 160 | 150 | 165 | 60 | 55 | 67 |
| Character after reduction | Black loose solid; a great increase in specific magnetic susceptibility; and magnetic separation can be easily carried out at a magnetic field intensity of 300-500 gauss . | Brown loose solid | Black loose solid |
[0034] Example 10 — Method for the reduction treatment of limonite:
[0035] The device used for the reduction of metal ore in this example, as shown in figure 5, has a metal ore reduction treatment furnace, wherein an upper end of the metal ore reduction treatment furnace has a feed hopper 1, there is a flue gas outlet between the feed hopper 1 and a furnace shell 2 of the metal ore reduction treatment furnace, an upper end inlet of the feed hopper 1 is a metal ore inlet for metal ore to be reduced in the metal ore reduction treatment furnace, a lower end of the metal ore reduction treatment furnace is connected with a screw conveyor 16 via a collection hopper portion 8, a metal ore outlet of the screw conveyor 16 is the metal ore outlet of the metal ore reduction treatment furnace, and the metal ore, having undergone the reduction reaction, is discharged to outside the furnace from here.
WO 2017/020789
PCT/CN2016/092400 [0036] The metal ore reduction treatment furnace is provided with a combustion-supporting gas distribution pipeline 5 and a reducing gas distribution pipeline 7, and the combustion-supporting gas distribution pipeline 5 and the reducing gas distribution pipeline 7 in this example are structurally the same, with the structures of same being as shown in figure 2 to figure 4, wherein there is a main pipe 21, fourteen branch pipes 22 are respectively transversely arranged on the two opposite sides of the main pipe 21, and one side of each branch pipe 22, i.e., the side facing downward in figure 1, is respectively provided with a plurality of gas outlet pipes 23. One end of the main pipe 21 is open as a combustion-supporting gas inlet and the other end thereof is closed; one end of each branch pipe 22 is in communication with the main pipe and the other end thereof is closed; and one end of each gas outlet pipe 23 is in communication with the branch pipe to which same is connected, and the other end thereof is open as a combustion-supporting gas outlet. The reducing gas outlets on the reducing gas distribution pipeline 7 are arranged between the metal ore inlet and the metal ore outlet of the metal ore reduction treatment furnace; and the combustion-supporting gas outlets on the combustion-supporting gas distribution pipeline 5 are arranged between the metal ore inlet and the reducing gas outlets of the metal ore reduction treatment furnace. The combustion-supporting gas distribution pipeline 5 and the reducing gas distribution pipeline 7 divide the interior of the metal ore reduction treatment furnace into two portions, i.e., a preheating zone Tl and a reaction zone T2, wherein the preheating zone Tl is an area between the outlet of the feed hopper 1 and the combustion-supporting gas distribution pipeline 5, and the reaction zone T2 is an area between the combustion-supporting gas distribution pipeline 5 and the reducing gas distribution pipeline 7, with the combustion-supporting gas distribution pipeline 5 being
WO 2017/020789
PCT/CN2016/092400 mounted at the junction of the preheating zone T1 and the reduction zone T2 and the reducing gas distribution pipeline 7 being mounted at the bottom of the reaction zone T2. Inside the furnace shell 2, a distributor mainly composed of a conical cylinder 3, the height position of which is adjustable, is mounted in the upper portion of the preheating zone T1.
[0037] The method for the reduction treatment of limonite of this example is as follows:
[0038] before the limonite enters the hopper 1 of the metal ore reduction treatment furnace, block-shaped limonite is firstly ground and sieved to obtain a metal ore 4 to be reduced which has a particle size of less than 30 mm, and then the metal ore 4 to be reduced is sent to the hopper 1 in figure 1 via an elevator.
[0039] In this example, air serves as the combustionsupporting gas in this metal ore reduction treatment method. The combustion-supporting gas enters via the combustion-supporting gas distribution pipeline 5, passes through the metal ore reduction treatment furnace and is discharged from the combustionsupporting gas outlets of the combustion-supporting gas distribution pipeline 5, and the discharged combustionsupporting gas is mixed, for combustion, with the unreacted reducing gas from the upper end of the reaction zone T2, the heat generated being used for preheating the metal ore 4 in the preheating zone T1. Adjusting the height of the conical cylinder 3 in the preheating zone T1 can adjust the stack height of the metal ore 4 in the preheating zone Tl, such that the metal ore 4 achieves a desired preheating effect and the waste of heat can be prevented.
[0040] In this example, water coal gas serves as the reducing gas in this metal ore reduction treatment method, and the reducing gas is input to the metal ore reduction treatment furnace via the reducing gas distribution pipeline 7 and undergoes an oxidationreduction reaction with the metal ore 4 in the reaction
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2016304050 03 May 2019 zone T2 of the metal ore reduction treatment furnace so as to reduce the metal ore 4.
[0041] The resulting reduced metal ore 4 is discharged to outside the metal ore reduction treatment furnace via a screw conveyor 16. The hot metal ore 4 discharged to outside the metal ore reduction treatment furnace is directly quenched in water for cooling, and the limonite, having undergone the reduction treatment in this example, is not easily re-oxidized with oxygen in the air, and is changed from a brown solid with a very small specific magnetic susceptibility into a black loose solid with a very great specific magnetic susceptibility, facilitating subsequent grinding and magnetic separation.
[0042] In addition, as a variant of this embodiment, the resulting reduced metal ore 4 may also be first quenched in water for cooling and then discharged to outside the furnace, or may be subjected to heat exchange cooling in a subsequent procedure under oxygen isolation conditions and then placed in the natural environment.
[0043] The reference in this specification to any prior publication (or information derived from it) , or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.
Claims (7)
- THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS :1. A metal ore reduction treatment method, wherein:a reduction reaction of a metal ore is carried out in a metal ore reduction treatment furnace, said metal ore reduction treatment furnace being provided with:a metal ore inlet at the top and a metal ore outlet at the bottom;reducing gas outlets between said metal ore inlet and said metal ore outlet, said reducing gas outlets being for discharging a reducing gas into the metal ore reduction treatment furnace; and combustion-supporting gas outlets between said metal ore inlet and said reducing gas outlets, said combustion-supporting gas outlets being for discharging a combustion-supporting gas into the metal ore reduction treatment furnace, said combustionsupporting gas being air; wherein:the metal ore reduction treatment furnace has a preheating zone above said combustion-supporting gas outlets;the metal ore reduction treatment furnace has a reduction zone located between said reducing gas outlets and said combustion-supporting gas outlets;the reducing gas discharged from said reducing gas outlets reacts with metal ore deposited in the reduction zone; and the combustion-supporting gas discharged from said combustion-supporting gas outlets supports combustion in said metal ore reduction treatment furnace to preheat metal ore deposited in the preheating zone.
- 2. The metal ore reduction treatment method as claimed in claim 1, wherein said metal ore is any one of iron ore, manganese ore or copper ore.- 16C:\Users\gw\AppData\Local\Microsoft\Wmdows\INetCache\Content.Outlook\PQY6I9W4\DRAFT 2SPA Pages - marked up copy - 35278027.DOCX-I8/06/20I92016304050 18 Jun 2019
- 3. The metal ore reduction treatment method as claimed in claim 1 or 2, wherein the particle size of said metal ore is 30 mm or less; the temperature of the reduction zone is 120°C-780°C; and the metal ore, having passed through said reduction zone, is cooled in a cooling zone located between said reducing gas outlets and the metal ore outlet of said metal ore reduction treatment furnace and then discharged from the metal ore outlet of said metal ore reduction treatment furnace.
- 4. The metal ore reduction treatment method as claimed in claim 1 or 2, wherein the particle size of said metal ore is 30 mm or less; the temperature of the reduction zone is 120°C-780°C; and the metal ore, having passed through said reduction zone, is cooled in a cooling zone located between said reducing gas outlets and the metal ore outlet of said metal ore reduction treatment furnace and then discharged from the metal ore outlet, with said cooling zone being provided with a gas cooler and a water cooler; and wherein said combustion-supporting gas is preheated by said gas cooler and then sent to said combustion-supporting gas outlets; and said reducing gas is water gas from a water gas generator, and said water cooler is a heat exchanger for producing steam for said water gas generator.
- 5. The metal ore reduction treatment method as claimed in claim 3, wherein said reducing gas outlets are distributed at the junction of said reduction zone and said cooling zone of said metal ore reduction treatment furnace; and said combustionsupporting gas outlets are distributed at the junction of said preheating zone and said reduction zone of said metal ore reduction treatment furnace.
- 6. The metal ore reduction treatment method as claimed in claim 4, wherein said reducing gas outlets are distributed at the junction of said reduction zone and said cooling zone of said- 17C:\Users\gw\AppData\Local\Microsoft\Wmdows\INetCache\Content.Outlook\PQY6I9W4\DRAFT 2SPA Pages - marked up copy - 35278027.DOCX-18/06/20192016304050 18 Jun 2019 metal ore reduction treatment furnace; and said combustionsupporting gas outlets are distributed at the junction of said preheating zone and said reduction zone of said metal ore reduction treatment furnace.
- 7. A metal ore reduction treatment furnace provided with:a metal ore inlet at the top and a metal ore outlet at the bottom;reducing gas outlets between said metal ore inlet and said metal ore outlet, said reducing gas outlets being for discharging a reducing gas into the metal ore reduction treatment furnace, said reducing gas being water gas;combustion-supporting gas outlets between said metal ore inlet and said reducing gas outlets, said combustion-supporting gas outlets being for discharging a combustion-supporting gas into the metal ore reduction treatment furnace, said combustionsupporting gas being air; and a gas cooler and a water cooler in a cooling zone between said reducing gas outlets and said metal ore outlet; wherein:the gas cooler is configured for cooling metal ore passing through the cooling zone using a combustion-supporting gas and thereby preheating the combustion-supporting gas;the water cooler is configured for cooling metal ore passing through the cooling zone using water and thereby generating steam;an outlet of said gas cooler is in communication with said combustion-supporting gas outlets for passing pre-heated combustion-supporting gas from the gas cooler to said combustionsupporting gas outlets;an outlet of said water cooler is in communication with a water gas generator for passing steam from the water cooler to said water gas generator; and said water gas generator is configured for providing water gas to the reducing gas outlets.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510462863.5A CN106702157A (en) | 2015-08-01 | 2015-08-01 | Reduction treatment method and reduction treatment furnace for metal ore |
| CN201510462863.5 | 2015-08-01 | ||
| PCT/CN2016/092400 WO2017020789A1 (en) | 2015-08-01 | 2016-07-29 | Metal ore metal recovery process and metal ore metal recovery process furnace |
Publications (2)
| Publication Number | Publication Date |
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| AU2016304050A1 AU2016304050A1 (en) | 2018-02-15 |
| AU2016304050B2 true AU2016304050B2 (en) | 2019-07-11 |
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| AU2016304050A Ceased AU2016304050B2 (en) | 2015-08-01 | 2016-07-29 | Metal ore metal recovery process and metal ore metal recovery process furnace |
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| Country | Link |
|---|---|
| CN (1) | CN106702157A (en) |
| AU (1) | AU2016304050B2 (en) |
| MY (1) | MY186491A (en) |
| WO (2) | WO2017020789A1 (en) |
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| WO2018096661A1 (en) | 2016-11-25 | 2018-05-31 | 日本電気株式会社 | Image generation device, face verification device, image generation method, and recording medium in which program is stored |
| CN113528983B (en) * | 2021-01-15 | 2022-03-25 | 武汉科技大学 | Iron-based amorphous soft magnetic alloy and preparation method thereof |
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| CN203462103U (en) * | 2013-07-29 | 2014-03-05 | 青岛智邦炉窑设计研究有限公司 | Mineral roasting reduction device |
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- 2016-07-29 WO PCT/CN2016/092400 patent/WO2017020789A1/en active Application Filing
- 2016-07-29 AU AU2016304050A patent/AU2016304050B2/en not_active Ceased
- 2016-07-29 WO PCT/CN2016/092410 patent/WO2017020793A1/en active Application Filing
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| CN101413056A (en) * | 2008-11-25 | 2009-04-22 | 朱军 | Manganese ore reduction calcination method and apparatus |
| CN203462103U (en) * | 2013-07-29 | 2014-03-05 | 青岛智邦炉窑设计研究有限公司 | Mineral roasting reduction device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017020793A1 (en) | 2017-02-09 |
| AU2016304050A1 (en) | 2018-02-15 |
| WO2017020789A1 (en) | 2017-02-09 |
| CN106702157A (en) | 2017-05-24 |
| MY186491A (en) | 2021-07-22 |
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