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Iron ore powder multi-stage suspension state reduction roasting device and method

A roasting device and iron ore powder technology, which is applied in metallurgy and mineral processing fields, can solve problems such as difficulty in obtaining ideal technical and economic indicators, complex mineral composition, and easy ring formation in rotary kilns, etc., with short time to achieve and high heat and mass transfer efficiency , the effect of reducing energy consumption

Active Publication Date: 2019-06-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] my country has huge reserves of complex refractory iron ore resources. The total reserves of typical refractory iron ore resources such as fine-grained ore, siderite, limonite, and oolitic hematite are more than 20 billion tons, and they are widely distributed in Liaoning and Hebei. , Shanxi, Shaanxi, Hubei, Xinjiang and other places; refractory iron ore has complex mineral composition and fine crystal particle size, it is difficult to obtain ideal technical and economic indicators by conventional mineral processing technology, and magnetization reduction roasting or direct reduction roasting-magnetic separation technology Good separation indicators can be obtained by processing such refractory iron ores; at present, the equipment for iron ore reduction (including magnetization) roasting mainly includes tunnel kiln, rotary kiln, rotary hearth furnace, shaft furnace, fluidized bed etc., but traditional tunnel kilns, shaft furnaces and rotary hearth furnaces and other roasting equipment have problems such as high energy consumption, and rotary kilns are prone to ring formation; fluidized beds have sufficient gas-solid contact, high heat and mass transfer efficiency, and fast reaction speed. It has become a hot spot in the research and development of reduction roasting equipment; at the current stage, it is particularly important to develop a new type of suspension reduction roasting equipment for iron ore powder

Method used

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  • Iron ore powder multi-stage suspension state reduction roasting device and method

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Experimental program
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Effect test

Embodiment 1

[0033] The structure of iron ore powder multi-stage suspension reduction roasting device is as follows: figure 1 As shown, it includes 6 groups of shell, baffle group, feed inlet and air intake pipe; the shell includes shell side plate, shell front plate 3, shell rear end plate 11, shell bottom plate 13 and shell top plate 12;

[0034] The top of the front end of the casing is provided with a feed port to communicate with the feed pipe 1, and the feed pipe 1 is provided with a flap valve 2;

[0035] A discharge port 10 is provided above the rear end of the casing;

[0036] The baffle group is composed of three upper baffles 7 and two lower baffles 8, and a lower baffle 8 is arranged between two adjacent upper baffles 7, and the baffle group connects the front end plate 3 of the shell and the rear end plate of the shell The space between 11 is evenly divided into 6 reaction chambers;

[0037] The bottom edge of each upper baffle plate 7 is opposite to the top edge of a suppor...

Embodiment 2

[0053] Device structure is the same as embodiment 1, and difference is:

[0054] The baffle group consists of 4 upper baffles and 3 lower baffles, and the baffle group divides the space between the front end plate of the housing and the rear end plate of the housing into 8 reaction chambers on average;

[0055] The iron grade of iron ore powder used is TFe 62.22%, containing FeO 0.26% by mass percentage, SiO 2 3.53%, Al 2 o 3 4.69%, CaO 0.07%, MgO 2.38%, P 0.07%, S 0.02%, particle size ≤ 0.8mm, of which the part with a particle size of -0.074mm accounts for 85% of the total mass;

[0056] Method is with embodiment 1, and difference is:

[0057] (1) The reducing gas is heated to 900°C by a gas heater; the volume percentage of nitrogen in the reducing gas is 40%;

[0058] (2) The residence time of the iron ore powder from the feed port to the discharge port is 20min, and the temperature of the iron ore powder for reduction reaction is 850°C; the ratio of the volume flow rat...

Embodiment 3

[0060] Device structure is the same as embodiment 1, and difference is:

[0061] The baffle group consists of 5 upper baffles and 4 lower baffles, and the baffle group divides the space between the front end plate of the housing and the rear end plate of the housing into 10 reaction chambers on average;

[0062] The iron grade of iron ore powder used is TFe 65.77%, containing FeO 0.78% by mass percentage, SiO 2 6.78%, Al 2 o 3 0.32%, CaO 1.11%, MgO 2.54%, P 0.07%, S 0.02%, particle size ≤ 0.8mm, of which the particle size is -0.074mm accounts for 70% of the total mass;

[0063] Method is with embodiment 1, and difference is:

[0064] (1) The reducing gas is heated to 750° C. by a gas heater; the reducing gas is a mixed gas composed of hydrogen, carbon monoxide and nitrogen, wherein the volume percentage of nitrogen is 40%, and the volume percentage of hydrogen is 40%;

[0065] (2) The residence time of the iron ore powder from the feed port to the discharge port is 40min,...

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Abstract

The invention discloses an iron ore powder multi-stage suspension state reduction roasting device and method. The device comprises a shell, a baffle plate group, a feeding pipe and an air inlet pipe group; a flap valve is arranged in the feeding pipe; the baffle group consists of N upper baffle plates and N-1 lower baffle plates, and one lower baffle plate is arranged between every two adjacent upper baffle plates; each upper baffle plate is opposite to one supporting plate, and the bottom surface of an airflow distribution plate is connected with the supporting plates; each air inlet pipe communicates with one air flow area; and the air inlet pipes simultaneously communicate with a gas heater. The method comprises the following steps: (1) heating the reducing gas to 500-900 DEG C and thenfeeding the reducing gas to each reaction chamber; (2) feeding iron ore powder into a feeding pipe, and opening the flap valve to feed the iron ore powder to the reaction chambers; (3) carrying out reduction reaction on the iron ore powder; and (4) discharging the iron ore powder from a discharge port after reduction reaction. The method has the advantages of high heat and mass transfer efficiency, high reaction speed and short reaction time in the reduction process, thereby greatly improving the production efficiency and reducing the energy consumption.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and metallurgy, and in particular relates to a multi-stage suspension reduction roasting device and method for iron ore powder. Background technique [0002] my country has huge reserves of complex refractory iron ore resources. The total reserves of typical refractory iron ore resources such as fine-grained ore, siderite, limonite, and oolitic hematite are more than 20 billion tons, and they are widely distributed in Liaoning and Hebei. , Shanxi, Shaanxi, Hubei, Xinjiang and other places; refractory iron ore has complex mineral composition and fine crystal particle size, it is difficult to obtain ideal technical and economic indicators by conventional mineral processing technology, and magnetization reduction roasting or direct reduction roasting-magnetic separation technology Good separation indicators can be obtained by processing such refractory iron ores; at present, the equipment fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10
Inventor 李艳军韩跃新余建文高鹏孙永升
Owner NORTHEASTERN UNIV
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