Summary of the invention
Technical matters to be solved by this invention is: provide a kind of difficulty to select ferric oxide ore flash magnetization roasting reaction velocity proving installation, this device will (3mm) difficulty selects ferric oxide ore to realize under fluidized state and in 5~100 seconds time that flash reduction magnetizing roast provides foundation for size fractionated, the flash magnetization roasting reaction time tapered to for tens seconds than the traditional handicraft reaction time by dozens of minutes, this device determination test sample ore roasting obtains qualified iron ore concentrate the fastest needed time and temperature conditions, thereby is that the problem that solves the prior art existence is cleared away the obstacles.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Be provided with blower fan, producer gas generator, separation vessel and reacting furnace, they are communicated with by pipeline successively.On producer gas generator and pipeline that separation vessel is communicated with, be provided with variable valve and transfer valve, be provided with material receiver in the bottom of separation vessel.Be provided with the pipeline that is communicated with between producer gas generator and reacting furnace, this pipeline is provided with transfer valve.The bottom of reacting furnace is communicated with blower fan by pipeline, and this pipeline is provided with operation valve.Reacting furnace, its upper, middle and lower is provided with the test point that stove reducing gas, furnace chamber temperature and exhaust temperature are gone in thermocouple measurement, and its bottom is provided with flow apparatus measures gas flow and composition test point thereof.
The present invention compared with prior art has following remarkable result:
One. can guarantee that material is in the stable suspersion state under 600~850 ℃ high temperature, reducing atmosphere condition, realize the technology of rapid loading, quickly discharging material, the entire reaction time is in 100 seconds, and the conditional parameter of accurate recording reaction.
With Da Ye Iron Mine strong magnetic chats (TFe30~35%) is raw material, it mainly contains haematite, siderite, contain mineral such as ferrosilicate, can obtain the good mineral processing index of iron ore concentrate iron content 58~60%, iron recovery 82~86% through " flash magnetization roasting-low intensity magnetic separation " preliminary test.And the magnetizing roast reaction velocity is fast, only needs for 5~100 seconds.Find out that thus through after the magnetizing roast, the iron oxide mineral are reduced to magnetic iron ore substantially, after low intensity magnetic separation, iron concentrate grade significantly improves again.
They are two years old. and can realize that granular material suspension, adjustment, atmosphere are regulated, quick discharge under the nonoxidizing atmosphere, thank to the new device of material fast, can measure the powdered iron ore and under suspended state, realize Fe
2O
3(weak magnetic) is to Fe
3O
4(ferromagnetism) change reaction velocity.
They are three years old. and under the high temperature reduction atmospheric condition, this device can guarantee that tested material is under the situation of cyclone suspension state, adds apace in the times of number with second and draws off, and Fe is measured in research
2O
3(weak magnetic) is to Fe
3O
4The reaction velocity that (ferromagnetism) changes, this does not still have report at home and abroad.
Embodiment
The present invention utilizes reducibility gas the haematite fluosolids roasting to be become the industrialization proving installation of magnetic iron ore under hot conditions.
The invention will be further described below in conjunction with embodiment and accompanying drawing.
Structure of the present invention is as shown in the figure: be provided with the blower fan 1, producer gas generator 2, separation vessel 7 and the reacting furnace 4 that are communicated with by pipeline successively.On producer gas generator 2 and pipeline that separation vessel 7 is communicated with, be provided with variable valve 9 and transfer valve 10, be provided with material receiver 6 in the bottom of separation vessel 7.Be provided with the pipeline that is communicated with between producer gas generator 2 and reacting furnace 4, this pipeline is provided with transfer valve 3.The bottom of reacting furnace 4 is communicated with blower fan 11 by pipeline, and this pipeline is provided with operation valve 12.Transfer valve 3 is consistent with transfer valve 10 structures, and its switching can guarantee the stable of the interior gas flow of reacting furnace.Reacting furnace 4, its upper, middle and lower are provided with thermocouple measurement and go into the test point of stove reducing gas, furnace chamber temperature and exhaust temperature " T ", and its bottom is provided with flow apparatus measures gas flow and composition test point " Q " thereof.
Reacting furnace 4 can be made by the stainless steel 0Cr25Ni20 material of anti-1400 ℃ high temperature for the boiling reduction furnace, and furnace chamber is the cylindrical tube of φ 50mm, highly is 1800-2500mm.Pyrometer fire-end can be seated in the furnace chamber, and the temperature that records like this is placed on the temperature measured the furnace wall more near actual temperature than pyrometer fire-end, in and the temp measuring system temperature departure ± 5 ℃.Be provided with the electric furnace that is " well " word shape outside stove, the formed heat tape of electric furnace is positioned at the outer middle and lower part of stove, comprises air distribution plate 13.The heat tape height is 800-1200mm, and its effect is a temperature conditions of guaranteeing the roasting reaction.Air distribution plate 13 is contained in furnace bottom, and its effect is to make material be in fluidized state in pipe, and its pressure reduction is measured by differential manometer.Furnace roof portion is communicated with charge door 5 by pipeline, and this pipeline is provided with transfer valve 3; Switching between the transfer valve 3 and 10 is in order to guarantee gas flow stable before and after reinforced.This charge door is for hand stock, so that make system be in sealing state as far as possible.
Producer gas generator 2 is a fuel with coke or charcoal, with air be gasifying medium, produce reducibility gas based on CO, wherein the content of CO is realized by the air quantity of adjusting blower fan 1.
It below is the operation steps of this device
A. according to the size fractionated material, the version of design air distribution plate, under cold conditions, measure a certain amount of material the boiling height, be in air quantity, the air distribution plate pressure reduction of best fluidized state, as hot following operating basis;
B. start electric pit-type heating furnace, be warming up to temperature of reaction.
C. select the material of a kind of warp, weighing behind the analysis component.
D. according to system's gas composition, set the blow rate required (annotate: the air quantity that air quantity should adapt to selected particle diameter requires).
E. No. 3, No. 10 system valves and variable valve are opened entirely.(No. 3 system valves are transfer valve 3 control fluidized bed air distribution plates, and No. 10 system valve is transfer valve 10 control bypass air distribution plates, and variable valve is leftmost valve)
F. with the nitrogen cylinder valve open, feed nitrogen, air in the discharge system to system.
G. after one minute, close, press predetermined wind amount to system's gas delivery to close the nitrogen valve.
H. close system valve No. 2, regulate flow valve with reference to cold conditions flow value (with reference to flow-pressure differential table or curve), make flow reach the boiling requirement by the fluidized bed furnace air distribution plate according to particle diameter.
I. open system valve No. 10, close No. 3 system valves after, to the boiling furnace charge.
J. after reinforced, open system valve simultaneously No. 3, close No. 10 system valves after, pick up counting.
K. boiling time one arrives, and simultaneously opens system valve rapidly No. 10, close No. 3 system valves after, open the nitrogen valve discharging rapidly.
Brief description principle of work of the present invention once.
The principle of work of whole device: question response stove 4 is warming up to about 740 ℃, feed the weakly magnetic iron ore sample through charge door 5 by technological requirement, regulate coal gas tolerance, reducibility gas enters in the reacting furnace behind the electric heating system heat temperature raising, make sample ore in stove, be in fluidized state (suspension fluidized state), sample in the stove is carried out the fluidisation reduction roasting to obtain magnetic iron ore under little condition of negative pressure and weak reducing atmosphere, start each test point simultaneously and begin test job, after the roasting several seconds, cut off coal gas and fast blow out stove outside with the nitrogen of 1.2~1.8atm pressure stove internal magnet mineral material, enter in the water by material receiver 6, making it quenching becomes qualified magnetizing roast product, promptly obtains iron concentrate grade 〉=60%, the product of concentrate iron recovery 〉=80%.And waste gas is discharged by gas exhaust duct 8, guarantees that system is under stable little condition of negative pressure.
Producer gas generator 2 is used for producing reducibility gas, be passed in the reacting furnace 4 by the pipeline heating system, its principle of work is: by technological requirement, it is fuel that coke or charcoal are housed in the stove, keeps suitable coal seam height, regulates blower fan 1 and blasts air capacity, burning degree with control fuel, carbon monoxide content in the coal gas is met the demands, and guarantee not have the oxygen residue, the entire reaction system is in the reducing atmosphere all the time.Gas stove exit gas component range of control is seen attached list.The gas temperature that producer gas generator generated simultaneously remains on more than 600 ℃, can reduce the heating demand of heating tape Elema effectively, guarantees that flash magnetization roasting can carry out under satisfied test temperature.
Subordinate list
Gas stove exit gas component range of control
Title | CO
2 | CO | O
2 | N
2 | Other |
Component (V/%) | 3~26 | 0.5~15 | ≤0.5 | 55~62 | Surplus |