CN110343850A - Strengthen the microwave continuous suspension roasting method of Refractory iron ore stone dissociation - Google Patents
Strengthen the microwave continuous suspension roasting method of Refractory iron ore stone dissociation Download PDFInfo
- Publication number
- CN110343850A CN110343850A CN201910773898.9A CN201910773898A CN110343850A CN 110343850 A CN110343850 A CN 110343850A CN 201910773898 A CN201910773898 A CN 201910773898A CN 110343850 A CN110343850 A CN 110343850A
- Authority
- CN
- China
- Prior art keywords
- reduction
- iron ore
- fluidizer
- pretreatment
- microwave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- C22B1/10—Roasting processes in fluidised form
Landscapes
- 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)
- Furnace Details (AREA)
Abstract
It is a kind of strengthen Refractory iron ore stone dissociation microwave continuous suspension roasting method sequentially include the following steps: (1) using microwave continuous suspension roasting system for Refractory iron ore stone pulverizing and jevigating and pour into feed hopper, be transported to pretreatment Fluidizer；(2) it is passed through protective gas into pretreatment feed space and pretreatment discharge chamber, Iron Ore Powder is made to be in fluidized state；(3) microwave generating apparatus is opened, is heated by microwave cavity, subsequently into reduction Fluidizer；(4) protective gas is passed through to reduction feed space and reduction discharging interior respectively；When temperature is reduced to 450~650 DEG C, it is passed through reducibility gas and carries out reduction magnetization roasting, reducing material enters cooler；(5) enter collecting tank after being cooled to 100 DEG C or less.Method of the invention can significantly improve degree of dissociation of mineral monomer and grindability, realize the recycling and efficient development and utilization of Refractory iron ore stone.
Description
Technical field
The invention belongs to technical field of mineral processing, and in particular to a kind of microwave of reinforcing Refractory iron ore stone dissociation
Continuous suspension roasting method.
Background technique
China's steel and iron industry rapidly develops in recent years, greatly facilitates the demand of iron ore, China's iron ore deposit reserves are rich
Richness, the end of the year 2017, China find out that iron ore resource reserves are 848.88 hundred million t；However, China's iron ore deposit be integrally in grade it is low,
The feature that grain size number is thin, mineral composition is complicated causes a large amount of iron ore deposit to fail to obtain effective exploitation utilization, this has to
Steel and iron industry is set to rely on import；2017,10.75 hundred million t of China's imported Fe ore, increase by 7.5%, external dependence degree is more than
86%, with the change of International Iron Ore stone relation between supply and demand, domestic iron ore price is caused to plummet and iron ore mine heavy losses；
Therefore, the Efficient Development for reinforcing Refractory iron ore stone utilizes, and to reduction China's iron ore external dependence degree, promotes China's steel
Industrial Health development is of great significance.
In recent years, it is utilized around the Efficient Development of Refractory iron ore stone, lot of domestic and foreign research unit has carried out largely
Basic research and technology development work, wherein the most prominent with selecting smelting combination, that is, magnetizing roast-magnetic separation process effect, and magnetize
It is applied in roasting-magnetic separation process and the most successfully surely belongs to suspending magnetization roasting-magnetic separation process；Wherein, Northeastern University's independent research
Preenrichment suspension roasting magnetic separation technology, with five crest bloodstone of Hubei, change eastern Exemplary deposition type hematite-limonite, Anshan iron and steel plant east tail
Mine, East Anshan iron ore and Powder ore of Jiu Steel etc. are raw material, have carried out the laboratory PSRM and the pilot plant test of system, are obtained good
Separation index；Herein on basis, how preferably to realize and improve mineral monomer dissociation and grindability, energy-saving and raising
Separation index becomes the key points and difficulties of research；In metallurgical engineering application process, microwave calcining is compared to tradition roasting performance
Big advantage out, microwave calcining speed ratio tradition roasting rate is 3.97~7.15 times high, selectively heats specific to microwave
Advantage, so that valuable mineral is with gangue mineral microwave absorbing property, there are larger differences, so mineral faying face generate internal stress and
Crackle and crack are formed, degree of dissociation of mineral monomer and grindability can be significantly improved, more energy-saving, sorting result is more aobvious
It writes.
Numerous experts and scholars have carried out a large amount of basic research for microwave calcining, and it is micro- that main direction of studying concentrates on mineral
Wave pretreatment, mineral microwave absorbing property, mineral static state carbon thermal reduction microwave calcining etc. are fresh for the microwave calcining under fluidized state
There is research, foundation utilizes the present Research of Refractory iron ore stone currently with suspension roasting-magnetic separation process Efficient Development how
Preferably realize that improving mineral monomer dissociation and grindability, separation index and energy-saving can be improved and set herein on basis
Standby automation and intelligent level will be following research emphasis and difficult point.
Summary of the invention
The object of the present invention is to provide a kind of microwave continuous suspension roasting methods of reinforcing Refractory iron ore stone dissociation, lead to
The new paragon for crossing microwave accumulation of heat pretreatment and suspending magnetization roasting combination carries out the quick accumulation of heat of selectivity to iron ore material, connects
Continuous property suspension roasting, enhancing iron mineral liberation degree of minerals, and then increase sorting mineral index, realize that Refractory iron ore stone is efficient
Comprehensive development and utilization.
Method of the invention be using microwave continuous suspension roasting system, the system include feed hopper, pretreatment Fluidizer,
Microwave cavity, microwave generating apparatus, reduction Fluidizer, cooler and collecting tank；The discharge port and pretreated stream of feed hopper bottom
The feed inlet connection for changing device, pre-processes and is cased with microwave cavity outside Fluidizer, and inside is equipped with pretreatment baffle and fluidizes pretreatment
Pretreatment feed space and pretreatment discharge chamber are divided into inside device, the top plate of the top margin and pretreatment Fluidizer that pre-process baffle connects
It connects, two sides for pre-processing baffle are connect with the side wall of pretreatment Fluidizer, and the bottom edge and pretreatment for pre-processing baffle fluidize
Gap between the bottom plate of device is as pre-processing channel；Pretreatment feed space and the bottom for pre-processing discharge chamber are respectively equipped with first
Air inlet and the second air inlet, the top for pre-processing feed space are equipped with gas outlet and are connected to the feed inlet of gas-solid separator；Pre- place
The top of pretreatment feed space is arranged in the feed inlet of reason Fluidizer；The discharge port setting for pre-processing Fluidizer discharges in pretreatment
The top of room, and be connected to the feed inlet of reduction Fluidizer；Restoring will restore in Fluidizer inside Fluidizer equipped with reduction baffle
Part is divided into reduction feed space and reduction discharge chamber, and the top margin for restoring baffle is connect with the top plate of reduction Fluidizer, restores baffle
Two sides with reduction Fluidizer side wall connect, restore baffle bottom edge and restore Fluidizer bottom plate between control work
To restore channel；Reduction feed space and the bottom for restoring discharge chamber are respectively equipped with third air inlet and the 4th air inlet；Reduction stream
The top of reduction feed space is arranged in the feed inlet for changing device, and the top of reduction discharge chamber is arranged in the discharge port for restoring Fluidizer,
And it is connected to the feed inlet of cooler；The discharge port of cooler is opposite with collecting tank；Microwave cavity and microwave generating apparatus assemble
Together；
Method sequentially includes the following steps:
1, by Refractory iron ore stone it is broken and it is levigate Iron Ore Powder is made, be subsequently poured into feed hopper, it is continuous by feed hopper
It is transported in pretreatment Fluidizer；
2, guarantor is passed through into pretreatment feed space and pretreatment discharge chamber respectively by the first air inlet and the second air inlet
Shield property gas makes to pre-process the Iron Ore Powder in Fluidizer and is in fluidized state, and protective gas is at the top of pretreatment feed space
Gas outlet discharge, part Iron Ore Powder are discharged into gas-solid separator with protective gas；
3, microwave generating apparatus is opened, the microwave of generation enters microwave cavity, and fluidizes by microwave cavity to pretreatment
Iron Ore Powder in device is heated to 800~1100 DEG C, and the Iron Ore Powder after being heated enters from the discharge port discharge of pretreatment Fluidizer
Restore Fluidizer；
4, protectiveness is passed through to reduction feed space and reduction discharging interior respectively by third air inlet and the 4th air inlet
Gas makes the Iron Ore Powder restored after being heated in Fluidizer be in fluidized state；The temperature of Iron Ore Powder after being heated reduces
When to 450~650 DEG C, reducibility gas is passed through to reduction discharging interior by the 4th air inlet, to the indoor Iron Ore Powder that discharges
Reduction magnetization roasting is carried out, reducing material is generated with reducibility gas and enters cooler；
5, after reducing material is cooled to 100 DEG C or less in cooler, collecting tank is continuously entered from cooler discharge port, is obtained
Obtain magnetizing roast Iron Ore Powder.
In the above method, the first air inlet is connected to by the pipeline with the first valve with the first air accumulator, the second air inlet
Mouth is connected to by the pipeline with the second valve with the first air accumulator.
In the above method, third air inlet is connected by the pipeline and the second air accumulator for having third valve and the 4th valve
Logical, the 4th air inlet is connected to by with the 5th valve and the 4th valve pipeline with the second air accumulator, and the 4th air inlet is also
It is connected to by the pipeline with the 6th valve with third air accumulator.
In the above method, the discharge port of gas-solid separator is opposite with feed hopper.
In the above method, microwave generating apparatus is made of waveguide, magnetron and antenna cap, and waveguide is connected by conducting wire and power supply
It connects, waveguide is located at below magnetron, microwave power instrument is equipped on magnetron, in the antenna cap insertion waveguide below magnetron.
In the above method, the first thermocouple, the are respectively equipped at the top of pretreatment Fluidizer, reduction-sulfurization device and cooler
Two thermocouples and third thermocouple, the first thermocouple, the second thermocouple and third thermocouple pass through data line and temperature measurer respectively
Connection；Wherein the first thermocouple is located in pretreatment discharge chamber, and it is indoor that the second thermocouple is located at reduction discharging.
Above-mentioned cooler is pipe heat exchanger, and cooling medium is water.
The volumetric ratio of above-mentioned pretreatment feed space and pretreatment discharge chamber is 1:(4~8), pretreatment baffle and pretreatment
The height ratio of Fluidizer is 1:(1~1.5)；Restoring feed space and restoring the volumetric ratio of discharge chamber is 1:(4~8), restore baffle
Height ratio with reduction Fluidizer is 1:(1~1.5).
The volumetric ratio of above-mentioned pretreatment Fluidizer and reduction Fluidizer is 1:1.
In above-mentioned step 2, the solid material that gas-solid separator is isolated enters feed hopper.
Above-mentioned iron ore Iron grade 10~58%.
In above-mentioned step 1, by Refractory iron ore stone it is broken and it is levigate be that Refractory iron ore stone is first crushed to grain
Diameter≤1mm, it is then levigate to account for the 70~90% of gross mass to the part partial size≤0.074mm, Iron Ore Powder is made.
Above-mentioned protective gas is N2Or CO2, it is stored in the first air accumulator and the second air accumulator；Reducibility gas is
CO、H2、CH4Or water-gas, it is stored in third air accumulator.
In above-mentioned step 3, residence time of the Iron Ore Powder in pretreatment Fluidizer is 20~60min.
In above-mentioned step 4, Iron Ore Powder after being heated is 20 in the time that reduction Fluidizer carries out reduction magnetization roasting
~60min.
In above-mentioned step 4, when being passed through reducibility gas to reduction discharge chamber, the intake and reduction of reducibility gas
The intake for the protective gas that feed space is passed through is 1:9~4:6 by volume.
In the above method, after reduction magnetization roasting, stops being passed through reducibility gas to reduction discharge chamber, close micro-
Wave generating device；By being passed through protective gas cooling into reduction Fluidizer and pretreatment Fluidizer；When reduction Fluidizer and
When pre-processing the temperature of Fluidizer lower than 300 DEG C, stopping is passed through protective gas.
In the above method, magnetizing roast Iron Ore Powder ore grinding to the part partial size≤0.038mm of acquisition accounts for the 40 of gross mass
~80%, it then carries out low intensity magnetic separation under the conditions of 80~100kA/m of magnetic field strength, obtains magnetic separation of iron ore concentrate, Iron grade >=
61%.
In the above method, iron recovery >=88% of the magnetic separation of iron ore concentrate relative to iron ore.
The protective gas that pretreatment feed space and pretreatment discharge chamber are passed through in above-mentioned step 2, in the unit time is total
The ratio of volume and the quality for the Iron Ore Powder for being passed through pretreatment feed space is 1~10m3/ kg, wherein be passed through pretreatment feed space with
The volume ratio for being passed through the protective gas of pretreatment discharge chamber is 1:(2~4).
In above-mentioned step 3, when third air inlet and the 4th air inlet are indoor to reduction feed space and reduction discharging respectively
When being passed through protective gas, being passed through reduction feed space and the volume flow ratio for the protective gas for being passed through reduction discharge chamber is 1:
(1.5~2)；It is passed through the volume of the protective gas of reduction feed space in unit time and enters the Iron Ore Powder of pretreatment feed space
Quality ratio be 1~10m3/kg。
Compared with prior art, outstanding advantages of the invention include:
1, by selectively heating advantage specific to microwave so that valuable mineral and gangue mineral microwave absorbing property exist compared with
Big difference, and then generate internal stress in mineral faying face and form crackle and crack, degree of dissociation of mineral monomer can be significantly improved
And grindability；
2, using microwave continuous suspension roasting device, sorting result is more significant, realizes the money of Refractory iron ore stone
Sourceization and efficient development and utilization；
3, microwave continuous suspension roasting device used, in addition to having concentrated the advantage of fluosolids roasting and microwave heating, with
The microwave applied-fluidization intermittence calciner is compared, which can realize industrial long run test analogue simulation, device
Automation and intelligent level greatly improve.
Detailed description of the invention
Fig. 1 is the microwave continuous suspension roasting system structure diagram in the embodiment of the present invention；
In figure, 1, feed hopper, 2, pretreatment Fluidizer, 3, microwave power adjusting apparatus, 4, magnetron, 5, microwave fills
It sets, 6, antenna cap, 7, waveguide, 8, microwave cavity, 9, power supply, the 10, first valve, the 11, second valve, the 12, first air accumulator,
13, exhaust pipe, 14, gas-solid separator, 15, gas outlet, 16, temperature measurer, 17, reduction Fluidizer, 18, cooler, 19, collection
Slot, the 20, the 5th valve, 21, third valve.22, the 6th valve, the 23, the 4th valve, the 24, first thermocouple, the 25, second thermoelectricity
It is even, 26, third thermocouple, the 27, second air accumulator, 28, third air accumulator.
Specific embodiment
Below in conjunction with example, the present invention will be further described.
The material of pretreatment Fluidizer and pretreatment baffle in the embodiment of the present invention is quartz.
The material of reduction Fluidizer and reduction baffle in the embodiment of the present invention is stainless steel, and outside is enclosed with heat preservation
Cotton.
The power regulation range of the microwave power instrument used in the embodiment of the present invention is 50~2400W.
Feed hopper, gas-solid separator, microwave cavity, reduction Fluidizer, cooler and collecting tank in the embodiment of the present invention
Material be stainless steel.
The temperature-measuring range of thermocouple in the embodiment of the present invention is 0~1100 DEG C.
The temperature measurer used in the embodiment of the present invention is digital display temperature measurer.
The waveguide model BJ26 used in the embodiment of the present invention.
The model 2M343K of the magnetron used in the embodiment of the present invention.
The antenna cap material used in the embodiment of the present invention is stainless steel.
Microwave frequency in the embodiment of the present invention is 2450 ± 25MHz.
The flow velocity of protective gas is 0.1~20m in the embodiment of the present invention3/h；The flow velocity of reducibility gas be 0.1~
20m3/h。
Iron Ore Powder liberation degree of minerals is roasted in the embodiment of the present invention and improves 3% or more, and grindability improves 3% or more and (compares
In the heating of traditional resistor heat transfer or thermal convection heating-fluosolids roasting method).
The Iron grade 60~70% of magnetic separation of iron ore concentrate in the embodiment of the present invention.
Embodiment 1
Microwave continuous suspension roasting system structure is as shown in Figure 1, include feed hopper 1, pretreatment Fluidizer 2, microwave cavity
8, microwave generating apparatus 5, reduction Fluidizer 17, cooler 18 and collecting tank 19；
The discharge port of 1 bottom of feed hopper is connected to the feed inlet of pretreatment Fluidizer 2, is pre-processed and is cased with outside Fluidizer 2
Microwave cavity 8, inside, which is equipped with to pre-process baffle and will pre-process, is divided into pretreatment feed space and pretreatment discharging inside Fluidizer 2
Room, the top margin for pre-processing baffle are connect with the top plate of pretreatment Fluidizer 2, and two sides and pretreatment for pre-processing baffle fluidize
The side wall of device 2 connects, and pre-processes the gap between the bottom edge of baffle and the bottom plate of pretreatment Fluidizer 2 as pre-processing channel；
Pretreatment feed space and the bottom for pre-processing discharge chamber are respectively equipped with the first air inlet and the second air inlet, pre-process
The top of feed space is equipped with gas outlet 15 and is connected to the feed inlet of gas-solid separator 14；The gas outlet of gas-solid separator 14 is connected with
Exhaust pipe 13；
The top of pretreatment feed space is arranged in the feed inlet of pretreatment Fluidizer 2；The discharge port of pretreatment Fluidizer 2 is set
It sets on the top of pretreatment discharge chamber, and is connected to the feed inlet of reduction Fluidizer 17；
It is equipped with reduction baffle inside reduction Fluidizer 17 and will restore and is divided into reduction feed space and reduction inside Fluidizer 17
Discharge chamber, the top margin for restoring baffle are connect with the top plate of reduction Fluidizer 17, restore two sides and the reduction Fluidizer of baffle
17 side wall connection restores the control between the bottom edge of baffle and the bottom plate of reduction Fluidizer 17 as reduction channel；
Reduction feed space and the bottom for restoring discharge chamber are respectively equipped with third air inlet and the 4th air inlet；
The top of reduction feed space is arranged in the feed inlet of reduction Fluidizer 17, and the discharge port setting of reduction Fluidizer 17 exists
The top of discharge chamber is restored, and is connected to the feed inlet of cooler 18；
The discharge port and collecting tank 19 of cooler 18 are opposite；
Microwave cavity 8 is assembled together with microwave generating apparatus 5；
First air inlet is connected to by the pipeline with the first valve 10 with the first air accumulator 12, and the second air inlet passes through band
There is the pipeline of the second valve 11 to be connected to the first air accumulator 12；Gas in first air accumulator 12 is N2；
Third air inlet is connected by the pipeline and the second air accumulator 27 for having concatenated third valve 21 and the 4th valve 23
Logical, the 4th air inlet is connected to by with concatenated 5th valve 20 and the 4th valve 23 pipeline with the second air accumulator 27,
4th air inlet is also connected to by the pipeline with the 6th valve 22 with third air accumulator 28；
Gas in second air accumulator 27 is N2, the gas in third air accumulator 28 is CO；
The discharge port and feed hopper 1 of gas-solid separator 14 are opposite；
Microwave generating apparatus 5 is made of waveguide 7, magnetron 4 and antenna cap 6, and waveguide 7 is connect by conducting wire with power supply 9, wave
It leads 7 and is located at 4 lower section of magnetron, microwave power adjusting apparatus 3 is equipped on magnetron 4, the antenna cap 6 of 4 lower section of magnetron is inserted into wave
It leads in 7；
The top of pretreatment Fluidizer 2, reduction-sulfurization device 17 and cooler 18 is respectively equipped with first the 24, second heat of thermocouple
Galvanic couple 25 and third thermocouple 26, the first thermocouple 24, the second thermocouple 25 and third thermocouple 26 respectively by data line with
Temperature measurer 16 connects；Wherein the first thermocouple 24 is located in pretreatment discharge chamber, and it is indoor that the second thermocouple 25 is located at reduction discharging；
Cooler 18 is pipe heat exchanger, and cooling medium is water；
Pre-processing feed space and pre-processing the volumetric ratio of discharge chamber is 1:6, pretreatment baffle and the height for pre-processing Fluidizer 2
Degree is than being 1:1.1；Restoring feed space and restoring the volumetric ratio of discharge chamber is 1:6, reduction baffle and the height for restoring Fluidizer 17
Than for 1:1.1；
Pre-processing Fluidizer 2 and restoring the volumetric ratio of Fluidizer 17 is 1:1；
Method are as follows:
By Refractory iron ore stone it is broken and it is levigate be that Refractory iron ore stone is first crushed to partial size≤1mm, it is levigate extremely
The part partial size≤0.074mm accounts for the 80% of gross mass, and Iron Ore Powder is made, is subsequently poured into feed hopper, continuously defeated by feed hopper
It is sent in pretreatment Fluidizer；The Refractory iron ore stone used is Yunnan somewhere bloodstone-limonite type Refractory iron ore
Stone, Iron grade 35.25% contain FeO 9.24%, SiO by mass percentage249.41%；
Protection is passed through into pretreatment feed space and pretreatment discharge chamber respectively by the first air inlet and the second air inlet
Property gas, so that the Iron Ore Powder pre-processed in Fluidizer be in fluidized state, protective gas from the top of pretreatment feed space out
Port discharge, part Iron Ore Powder are discharged into gas-solid separator with protective gas；The solid material that gas-solid separator is isolated
Into feed hopper, the gas material that gas-solid separator is isolated is discharged through exhaust pipe；Pretreatment feed space is passed through in unit time
It is 4m with the protective gas total volume of pretreatment discharge chamber and the ratio of the quality for the Iron Ore Powder for being passed through pretreatment feed space3/
Kg, wherein the volume ratio for being passed through pretreatment feed space and the protective gas for being passed through pretreatment discharge chamber is 1:3；
Microwave generating apparatus is opened, the microwave of generation enters microwave cavity, and by microwave cavity to pretreatment Fluidizer
Interior Iron Ore Powder is heated to 900 DEG C, and the Iron Ore Powder after being heated is fluidized from the discharge port discharge of pretreatment Fluidizer into reduction
Device；Residence time of the Iron Ore Powder in pretreatment Fluidizer is 45min；When third air inlet and the 4th air inlet are respectively to reduction
When feed space and reduction discharging interior are passed through protective gas, it is passed through reduction feed space and is passed through the protectiveness gas of reduction discharge chamber
The volume flow ratio of body is 1:1.5；It is passed through the volume of the protective gas of reduction feed space in unit time and enters and pre-processes
The ratio of the quality of the Iron Ore Powder of feed space is 4.5m3/kg；
Protectiveness gas is passed through to reduction feed space and reduction discharging interior respectively by third air inlet and the 4th air inlet
Body makes the Iron Ore Powder restored after being heated in Fluidizer be in fluidized state；The temperature of Iron Ore Powder after being heated is reduced to
At 550 DEG C, reducibility gas is passed through to reduction discharging interior by the 4th air inlet, indoor Iron Ore Powder restores to discharging
Magnetizing roast generates reducing material with reducibility gas and enters cooler；Iron Ore Powder after being heated is carried out in reduction Fluidizer
The time of reduction magnetization roasting is 35min；When to reduction discharge chamber be passed through reducibility gas when, the intake of reducibility gas with
The intake for the protective gas that reduction feed space is passed through is 1:9 by volume；
After reducing material is cooled to 100 DEG C or less in cooler, collecting tank is continuously entered from cooler discharge port, is obtained
Magnetizing roast Iron Ore Powder；
After reduction magnetization roasting, stops being passed through reducibility gas to reduction discharge chamber, close microwave generating apparatus；
By being passed through protective gas cooling into reduction Fluidizer and pretreatment Fluidizer；When reduction Fluidizer and pretreatment Fluidizer
Temperature be lower than 300 DEG C when, stopping be passed through protective gas；
The magnetizing roast Iron Ore Powder ore grinding of acquisition to the part partial size≤0.038mm accounts for the 40% of gross mass, then in magnetic
Low intensity magnetic separation is carried out under the conditions of field intensity 90kA/m, obtains magnetic separation of iron ore concentrate, Iron grade 62.1%；Magnetic separation of iron ore concentrate is relative to iron
The iron recovery 88.5% of ore.
Embodiment 2
With embodiment 1, difference is system structure:
Gas in (1) first air accumulator is CO2；Gas in second air accumulator is CO2, gas in third air accumulator
For H2；
(2) volumetric ratio of pretreatment feed space and pretreatment discharge chamber is 1:5, pre-processes baffle and pre-processes Fluidizer
Height is than being 1:1；Restoring feed space and restoring the volumetric ratio of discharge chamber is 1:5, reduction baffle and the height ratio for restoring Fluidizer
For 1:1；
With embodiment 1, difference is method:
(1) part partial size≤0.074mm accounts for the 70% of gross mass in Iron Ore Powder, the Iron grade 15.1% of iron ore；
(2) be passed through in the unit time pretreatment feed space and pretreatment discharge chamber protective gas total volume be passed through it is pre-
The ratio for handling the quality of the Iron Ore Powder of feed space is 5.5m3/ kg, wherein being passed through pretreatment feed space and being passed through pretreatment discharging
The volume ratio of the protective gas of room is 1:4；
(3) 1100 DEG C are heated to the Iron Ore Powder in pretreatment Fluidizer by microwave cavity；Iron Ore Powder is in pretreated stream
Change the residence time 20min in device；When third air inlet and the 4th air inlet are indoor to reduction feed space and reduction discharging respectively
When being passed through protective gas, the volume flow ratio for being passed through reduction feed space and the protective gas for being passed through reduction discharge chamber is 1:2；
It is passed through the volume of the protective gas of reduction feed space in unit time and enters the quality of the Iron Ore Powder of pretreatment feed space
Ratio is 6m3/kg；
(4) it is indoor to reduction discharging by the 4th air inlet when the temperature of the Iron Ore Powder after being heated is reduced to 600 DEG C
It is passed through reducibility gas, indoor Iron Ore Powder carries out reduction magnetization roasting to discharging；Iron Ore Powder after being heated is fluidized in reduction
The time that device carries out reduction magnetization roasting is 25min；When being passed through reducibility gas to reduction discharge chamber, reducibility gas leads to
Entering amount and restoring the intake for the protective gas that feed space is passed through is 4:6 by volume；
(5) magnetizing roast Iron Ore Powder ore grinding to the part partial size≤0.038mm obtained accounts for the 80% of gross mass, then exists
Low intensity magnetic separation is carried out under the conditions of magnetic field strength 100kA/m, obtains magnetic separation of iron ore concentrate, Iron grade 63.3%；Magnetic separation of iron ore concentrate is opposite
In the iron recovery 89.4% of iron ore.
Embodiment 3
With embodiment 1, difference is system structure:
(1) gas in third air accumulator is CH4；
(2) volumetric ratio of pretreatment feed space and pretreatment discharge chamber is 1:8, pre-processes baffle and pre-processes Fluidizer
Height is than being 1:1.5；Restoring feed space and restoring the volumetric ratio of discharge chamber is 1:8, reduction baffle and the height for restoring Fluidizer
Than for 1:1.5；
With embodiment 1, difference is method:
(1) part partial size≤0.074mm accounts for the 90% of gross mass in Iron Ore Powder, the Iron grade 29.6% of iron ore；
(2) be passed through in the unit time pretreatment feed space and pretreatment discharge chamber protective gas total volume be passed through it is pre-
The ratio for handling the quality of the Iron Ore Powder of feed space is 7.5m3/ kg, wherein being passed through pretreatment feed space and being passed through pretreatment discharging
The volume ratio of the protective gas of room is 1:2；
(3) 1000 DEG C are heated to the Iron Ore Powder in pretreatment Fluidizer by microwave cavity；Iron Ore Powder is in pretreated stream
Change the residence time 30min in device；When third air inlet and the 4th air inlet are indoor to reduction feed space and reduction discharging respectively
When being passed through protective gas, being passed through reduction feed space and the volume flow ratio for the protective gas for being passed through reduction discharge chamber is 1:
1.8；It is passed through the volume of the protective gas of reduction feed space in unit time and enters the matter of the Iron Ore Powder of pretreatment feed space
The ratio of amount is 3.5m3/kg；
(4) it is indoor to reduction discharging by the 4th air inlet when the temperature of the Iron Ore Powder after being heated is reduced to 450 DEG C
It is passed through reducibility gas, indoor Iron Ore Powder carries out reduction magnetization roasting to discharging；Iron Ore Powder after being heated is fluidized in reduction
The time that device carries out reduction magnetization roasting is 60min；When being passed through reducibility gas to reduction discharge chamber, reducibility gas leads to
Entering amount and restoring the intake for the protective gas that feed space is passed through is 3:7 by volume；
(5) magnetizing roast Iron Ore Powder ore grinding to the part partial size≤0.038mm obtained accounts for the 50% of gross mass, then exists
Low intensity magnetic separation is carried out under the conditions of magnetic field strength 80kA/m, obtains magnetic separation of iron ore concentrate, Iron grade 65.4%；Magnetic separation of iron ore concentrate relative to
The iron recovery 89.2% of iron ore.
Embodiment 4
With embodiment 1, difference is system structure:
Gas in (1) first air accumulator is CO2；Gas in second air accumulator is CO2, gas in third air accumulator
For water-gas；
(2) volumetric ratio of pretreatment feed space and pretreatment discharge chamber is 1:4, pre-processes baffle and pre-processes Fluidizer
Height is than being 1:1.3；Restoring feed space and restoring the volumetric ratio of discharge chamber is 1:4, reduction baffle and the height for restoring Fluidizer
Than for 1:1.3；
With embodiment 1, difference is method:
(1) part partial size≤0.074mm accounts for the 85% of gross mass in Iron Ore Powder, the Iron grade 47.3% of iron ore；
(2) be passed through in the unit time pretreatment feed space and pretreatment discharge chamber protective gas total volume be passed through it is pre-
The ratio for handling the quality of the Iron Ore Powder of feed space is 2.5m3/ kg, wherein being passed through pretreatment feed space and being passed through pretreatment discharging
The volume ratio of the protective gas of room is 1:2.5；
(3) 800 DEG C are heated to the Iron Ore Powder in pretreatment Fluidizer by microwave cavity；Iron Ore Powder is fluidized in pretreatment
Residence time 60min in device；When third air inlet and the 4th air inlet are indoor logical to reduction feed space and reduction discharging respectively
When entering protective gas, the volume flow ratio for being passed through reduction feed space and the protective gas for being passed through reduction discharge chamber is 1:1.6；
It is passed through the volume of the protective gas of reduction feed space in unit time and enters the quality of the Iron Ore Powder of pretreatment feed space
Ratio is 7m3/kg；
(4) it is indoor to reduction discharging by the 4th air inlet when the temperature of the Iron Ore Powder after being heated is reduced to 650 DEG C
It is passed through reducibility gas, indoor Iron Ore Powder carries out reduction magnetization roasting to discharging；Iron Ore Powder after being heated is fluidized in reduction
The time that device carries out reduction magnetization roasting is 20min；When being passed through reducibility gas to reduction discharge chamber, reducibility gas leads to
Entering amount and restoring the intake for the protective gas that feed space is passed through is 2:8 by volume；
(5) magnetizing roast Iron Ore Powder ore grinding to the part partial size≤0.038mm obtained accounts for the 60% of gross mass, then exists
Low intensity magnetic separation is carried out under the conditions of magnetic field strength 95kA/m, obtains magnetic separation of iron ore concentrate, Iron grade 62.8%；Magnetic separation of iron ore concentrate relative to
The iron recovery 86.1% of iron ore.
Claims (10)
1. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone, it is characterised in that use microwave continuous
Suspension roasting system, the system include feed hopper, pretreatment Fluidizer, microwave cavity, microwave generating apparatus, reduction Fluidizer,
Cooler and collecting tank；The discharge port of feed hopper bottom is connected to the feed inlet of pretreatment Fluidizer, is pre-processed outside Fluidizer
It is cased with microwave cavity, inside, which is equipped with pretreatment baffle and will pre-process, to be divided into pretreatment feed space and pre-process out inside Fluidizer
Expect room, the top margin for pre-processing baffle is connect with the top plate of pretreatment Fluidizer, pre-processes two sides and the pretreated stream of baffle
The side wall connection for changing device pre-processes the gap between the bottom edge of baffle and the bottom plate of pretreatment Fluidizer as pre-processing channel；
Pretreatment feed space and the bottom for pre-processing discharge chamber are respectively equipped with the first air inlet and the second air inlet, pre-process feed space
Top is equipped with gas outlet and is connected to the feed inlet of gas-solid separator；The feed inlet setting of Fluidizer is pre-processed in pretreatment feed space
Top；The top of pretreatment discharge chamber is arranged in the discharge port of pretreatment Fluidizer, and connects with the feed inlet of reduction Fluidizer
It is logical；It is equipped with reduction baffle inside reduction Fluidizer and will restore and is divided into reduction feed space and reduction discharge chamber inside Fluidizer, also
The top margin of former baffle is connect with the top plate of reduction Fluidizer, and two sides for restoring baffle are connect with the side wall of reduction Fluidizer,
The control between the bottom edge of baffle and the bottom plate of reduction Fluidizer is restored as reduction channel；Restore feed space and reduction discharge chamber
Bottom be respectively equipped with third air inlet and the 4th air inlet；The upper of reduction feed space is arranged in the feed inlet of reduction Fluidizer
Portion, the top of reduction discharge chamber is arranged in the discharge port for restoring Fluidizer, and is connected to the feed inlet of cooler；Cooler goes out
Material mouth is opposite with collecting tank；Microwave cavity is assembled together with microwave generating apparatus；
Method sequentially includes the following steps:
(1) by Refractory iron ore stone it is broken and it is levigate Iron Ore Powder is made, be subsequently poured into feed hopper, be continuously conveyed by feed hopper
Into pretreatment Fluidizer；
(2) protectiveness is passed through into pretreatment feed space and pretreatment discharge chamber respectively by the first air inlet and the second air inlet
Gas makes the Iron Ore Powder pre-processed in Fluidizer be in fluidized state, and protective gas is from the outlet pre-processed at the top of feed space
Mouth discharge, part Iron Ore Powder are discharged into gas-solid separator with protective gas；
(3) microwave generating apparatus is opened, the microwave of generation enters microwave cavity, and by microwave cavity in pretreatment Fluidizer
Iron Ore Powder be heated to 800~1100 DEG C, the Iron Ore Powder after being heated from pretreatment Fluidizer discharge port discharge, into reduction
Fluidizer；
(4) protectiveness gas is passed through to reduction feed space and reduction discharging interior respectively by third air inlet and the 4th air inlet
Body makes the Iron Ore Powder restored after being heated in Fluidizer be in fluidized state；The temperature of Iron Ore Powder after being heated is reduced to
At 450~650 DEG C, reducibility gas is passed through to reduction discharging interior by the 4th air inlet, to discharge indoor Iron Ore Powder into
The roasting of row reduction magnetization generates reducing material with reducibility gas and enters cooler；
(5) reducing material is cooled to 100 DEG C or less in coolerAfterwards, collecting tank is continuously entered from cooler discharge port, is obtained
Magnetizing roast Iron Ore Powder.
2. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
It is characterized in that first air inlet is connected to by the pipeline with the first valve with the first air accumulator, the second air inlet passes through
Pipeline with the second valve is connected to the first air accumulator.
3. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
It is characterized in that the third air inlet is connected to by the pipeline with third valve and the 4th valve with the second air accumulator, the 4th
Air inlet is connected to by with the 5th valve and the 4th valve pipeline with the second air accumulator, and the 4th air inlet, which also passes through, to be had
The pipeline of 6th valve is connected to third air accumulator.
4. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
It is characterized in that the microwave generating apparatus is made of waveguide, magnetron and antenna cap, waveguide is connected to power supply by conducting wire, wave
It leads and is located at below magnetron, be equipped with microwave power instrument on magnetron, in the antenna cap insertion waveguide below magnetron.
5. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
The first thermocouple, the second heat are respectively equipped at the top of pretreatment Fluidizer, reduction-sulfurization device and cooler described in being characterized in that
Galvanic couple and third thermocouple, the first thermocouple, the second thermocouple and third thermocouple pass through data line respectively and connect with temperature measurer；
Wherein the first thermocouple is located in pretreatment discharge chamber, and it is indoor that the second thermocouple is located at reduction discharging.
6. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
It is characterized in that the pretreatment feed space and pre-processes the volumetric ratio of discharge chamber as 1:(4~8), pretreatment baffle and pretreatment
The height ratio of Fluidizer is 1:(1~1.5)；Restoring feed space and restoring the volumetric ratio of discharge chamber is 1:(4~8), restore baffle
Height ratio with reduction Fluidizer is 1:(1~1.5).
7. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
It is characterized in that the iron ore Iron grade 10~58%.
8. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
It is characterized in that the protective gas is N2Or CO2, reducibility gas CO, H2、CH4Or water-gas.
9. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
It is characterized in that in step (4), when being passed through reducibility gas to reduction discharge chamber, the intake of reducibility gas and reduction are fed
The intake for the protective gas that room is passed through is 1:9~4:6 by volume.
10. a kind of microwave continuous suspension roasting method for strengthening the dissociation of Refractory iron ore stone according to claim 1,
It is characterized in that magnetizing roast Iron Ore Powder ore grinding to the part partial size≤0.038mm obtained accounts for the 40~80% of gross mass, then
Low intensity magnetic separation is carried out under the conditions of 80~100kA/m of magnetic field strength, obtains magnetic separation of iron ore concentrate, Iron grade >=61%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910773898.9A CN110343850B (en) | 2019-08-21 | 2019-08-21 | Microwave continuous suspension roasting method for strengthening dissociation of complex refractory iron ore |
| PCT/CN2020/071950 WO2021031526A1 (en) | 2019-08-21 | 2020-01-14 | Microwave continuous suspension roasting method for strengthening dissociation of complex refractory iron ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910773898.9A CN110343850B (en) | 2019-08-21 | 2019-08-21 | Microwave continuous suspension roasting method for strengthening dissociation of complex refractory iron ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110343850A true CN110343850A (en) | 2019-10-18 |
| CN110343850B CN110343850B (en) | 2021-04-13 |
Family
ID=68180935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910773898.9A Active CN110343850B (en) | 2019-08-21 | 2019-08-21 | Microwave continuous suspension roasting method for strengthening dissociation of complex refractory iron ore |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110343850B (en) |
| WO (1) | WO2021031526A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021031526A1 (en) * | 2019-08-21 | 2021-02-25 | 东北大学 | Microwave continuous suspension roasting method for strengthening dissociation of complex refractory iron ore |
| CN113265533A (en) * | 2021-05-18 | 2021-08-17 | 东北大学 | Roasting system and method for efficiently utilizing biomass |
| CN115725862A (en) * | 2022-11-22 | 2023-03-03 | 东北大学 | Method for enhancing vanadium extraction of vanadium shale by microwave suspension roasting-alkali mixing curing |
| CN115747488A (en) * | 2022-11-22 | 2023-03-07 | 东北大学 | Vanadium shale microwave suspension roasting-alkali mixing curing vanadium extraction system and vanadium extraction method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998005418A1 (en) * | 1996-08-06 | 1998-02-12 | Emr Microwave Technology Corporation | Method and apparatus for microwave treatment of metal ores and concentrates in a fluidized bed reactor |
| CN1733943A (en) * | 2004-08-10 | 2006-02-15 | 孔凡逸 | Method and device for manufacturing reduced iron using microwave fluid bed |
| CN1754966A (en) * | 2004-09-27 | 2006-04-05 | 孔凡逸 | Process for preparing reduced iron by microwave fluidized bed |
| US20160265082A1 (en) * | 2012-09-26 | 2016-09-15 | Orbite Technologies Inc. | Processes for treating magnesium-containing materials |
| CN106868292A (en) * | 2017-03-31 | 2017-06-20 | 东北大学 | A kind of refractory iron ore multistage suspension magnetizing roast magnetic separation system device and method |
| CN107523684A (en) * | 2017-07-19 | 2017-12-29 | 东北大学 | A kind of suspension roasting ferromanganese method for separating and processing containing Ferromanganese Ore |
| CN107686885A (en) * | 2017-07-19 | 2018-02-13 | 东北大学 | A kind of method that red mud suspension roasting prepares Iron concentrate |
| CN108504855A (en) * | 2018-05-09 | 2018-09-07 | 东北大学 | A method of producing iron ore concentrate by reducing agent suspending magnetization roasting of siderite |
| CN109022760A (en) * | 2018-09-14 | 2018-12-18 | 东北大学 | A kind of microwave-fluosolids roasting method for strengthening the sorting of Refractory iron ore stone |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055728B (en) * | 2018-09-14 | 2020-04-21 | 东北大学 | Microwave-fluidized roasting device for treating complex refractory iron ore |
| CN110343850B (en) * | 2019-08-21 | 2021-04-13 | 东北大学 | Microwave continuous suspension roasting method for strengthening dissociation of complex refractory iron ore |
-
2019
- 2019-08-21 CN CN201910773898.9A patent/CN110343850B/en active Active
-
2020
- 2020-01-14 WO PCT/CN2020/071950 patent/WO2021031526A1/en active Application Filing
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998005418A1 (en) * | 1996-08-06 | 1998-02-12 | Emr Microwave Technology Corporation | Method and apparatus for microwave treatment of metal ores and concentrates in a fluidized bed reactor |
| CN1733943A (en) * | 2004-08-10 | 2006-02-15 | 孔凡逸 | Method and device for manufacturing reduced iron using microwave fluid bed |
| CN1754966A (en) * | 2004-09-27 | 2006-04-05 | 孔凡逸 | Process for preparing reduced iron by microwave fluidized bed |
| US20160265082A1 (en) * | 2012-09-26 | 2016-09-15 | Orbite Technologies Inc. | Processes for treating magnesium-containing materials |
| CN106868292A (en) * | 2017-03-31 | 2017-06-20 | 东北大学 | A kind of refractory iron ore multistage suspension magnetizing roast magnetic separation system device and method |
| CN107523684A (en) * | 2017-07-19 | 2017-12-29 | 东北大学 | A kind of suspension roasting ferromanganese method for separating and processing containing Ferromanganese Ore |
| CN107686885A (en) * | 2017-07-19 | 2018-02-13 | 东北大学 | A kind of method that red mud suspension roasting prepares Iron concentrate |
| CN108504855A (en) * | 2018-05-09 | 2018-09-07 | 东北大学 | A method of producing iron ore concentrate by reducing agent suspending magnetization roasting of siderite |
| CN109022760A (en) * | 2018-09-14 | 2018-12-18 | 东北大学 | A kind of microwave-fluosolids roasting method for strengthening the sorting of Refractory iron ore stone |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021031526A1 (en) * | 2019-08-21 | 2021-02-25 | 东北大学 | Microwave continuous suspension roasting method for strengthening dissociation of complex refractory iron ore |
| CN113265533A (en) * | 2021-05-18 | 2021-08-17 | 东北大学 | Roasting system and method for efficiently utilizing biomass |
| CN115725862A (en) * | 2022-11-22 | 2023-03-03 | 东北大学 | Method for enhancing vanadium extraction of vanadium shale by microwave suspension roasting-alkali mixing curing |
| CN115747488A (en) * | 2022-11-22 | 2023-03-07 | 东北大学 | Vanadium shale microwave suspension roasting-alkali mixing curing vanadium extraction system and vanadium extraction method thereof |
| CN115725862B (en) * | 2022-11-22 | 2024-06-11 | 辽宁东大矿冶工程技术有限公司 | Method for strengthening vanadium extraction by microwave suspension roasting-alkali mixing curing of vanadium shale |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021031526A1 (en) | 2021-02-25 |
| CN110343850B (en) | 2021-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110343850A (en) | Strengthen the microwave continuous suspension roasting method of Refractory iron ore stone dissociation | |
| CN109022760B (en) | Microwave-fluidized roasting method for strengthening separation of complex refractory iron ores | |
| CN101386908B (en) | Magnetization roasting technique system for refractory iron ore powder and roasting technology | |
| CN102628097B (en) | Method for preparing iron concentrate powder by reducing and magnetizing red mud in fluidized bed | |
| CN111644267B (en) | Complex iron ore reinforced separation method based on mineral phase subsection accurate regulation and control | |
| CN104357651A (en) | Powder magnetization roasting and cooling system | |
| CN100507011C (en) | Roasting device for reducing hematite, limonite or siderite | |
| CN109055728B (en) | Microwave-fluidized roasting device for treating complex refractory iron ore | |
| CN102728457A (en) | Method of producing nickel-containing iron ore concentrate from siliceous iron oxide ores containing nickel | |
| CN105316476A (en) | Preparation method for producing strong-magnetism magnetite through refractory weak-magnetism oxidized iron ore | |
| CN105907946A (en) | Method and system for preparing iron concentrate powder from high phosphorous iron ores | |
| CN109136540B (en) | Microwave fluidized roasting-leaching method for enhancing iron extraction and phosphorus reduction of high-phosphorus iron ore | |
| CN108239700A (en) | A kind of coal base fluidization reduction roasting system and its method of roasting | |
| CN103468930A (en) | Method and device for preparing nickel iron roasted ore by utilizing lateritic nickel ore | |
| CN103447148B (en) | Microwave reduction is utilized to contain concentration equipment and the magnetic selection method of bloodstone material | |
| CN103290161B (en) | Equipment and method for carrying out slag-iron separation and iron reduction on refractory ore, complex ore and chemical industry ferruginous waste | |
| CN110396594B (en) | Microwave continuous suspension roasting method for enhancing iron and phosphorus increase and reduction of high-phosphorus oolitic hematite | |
| CN109943710B (en) | Iron ore powder multi-stage suspension state reduction roasting device and method | |
| CN207130312U (en) | A kind of system for handling hematite-type difficulty and selecting iron material | |
| CN111635991B (en) | Device for regulating magnetism and intensively sorting roasted materials by air cooling and recovering latent heat | |
| CN113798054A (en) | Pre-selection-fluidization roasting-grinding magnetic separation process for treating iron tailings | |
| CN110530160B (en) | Microwave continuous suspension magnetizing roasting system for treating iron ore | |
| CN209178420U (en) | A kind of device of coal-based direct reduction baked for producing reduced iron | |
| CN204174254U (en) | powder magnetizing roasting and cooling system | |
| CN207176035U (en) | A kind of lateritic nickel ore dry method suspension sintering equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |