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Rectangular shaft furnace for roasting ferrochromium pellets and roasting method thereof

A ferrochrome alloy and roasting technology, which is applied in the direction of furnaces, furnace materials, vertical furnaces, etc., can solve the problems of large investment, raw firing, and less practical application, and achieve the effects of uniform pellet roasting, high roasting intensity, and good smelting indicators

Pending Publication Date: 2018-10-19
JILIN MECHANICAL & ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the grate rotary kiln equipment not only has a large investment, but also has an unsatisfactory practical application effect for the roasting of chrome ore pellets; the belt roaster is relatively polluting and has little practical application; currently there is no equipment for roasting chrome ore pellets in China. rectangular shaft furnace
Existing rectangular shaft furnaces are mainly used for roasting iron ore pellets, but iron ore pellets and chromium ore pellets differ greatly in pellet roasting mechanism, the height of iron ore pellet preheating zone and roasting zone is short, and iron ore pellets After the pellets are roasted, there is a soaking reaction process. After the soaking reaction, the air distribution port of the iron ore pellets is generally lower, which makes the rectangular shaft furnace of the iron ore pellets prone to defects such as bursting, surface cracks, and burning when roasting the chromium ore pellets. , low strength and low output of chrome ore pellets

Method used

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  • Rectangular shaft furnace for roasting ferrochromium pellets and roasting method thereof
  • Rectangular shaft furnace for roasting ferrochromium pellets and roasting method thereof
  • Rectangular shaft furnace for roasting ferrochromium pellets and roasting method thereof

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Effect test

Embodiment 2

[0061] Embodiment 2, the rectangular shaft furnace and its roasting method for ferrochrome alloy pellet roasting of the present embodiment are basically the same as that of Example 1, the difference is that the roasting parameters are different, and the specific methods are as follows:

[0062] 1) Feeding, the ferrochrome green pellets are transported to the top of the drying bed 204 via a distributor, and the ferrochrome green pellets have a particle size of 10-25mm;

[0063] 2) drying, the ferrochrome green pellets transported to the drying bed 204 enters the pre-tropical zone 209 after being dried at 350° C. on the drying bed 204, and the drying time is 35 minutes;

[0064] 3) Preheating, the ferrochrome green pellets that enter the preheating zone 209 are preheated at 500°C for 20 minutes in the preheating zone 209, and the ferrochrome green pellets enter the roasting zone 208 after preheating;

[0065] 4) Roasting, the ferrochrome green pellets entering the roasting zone ...

Embodiment 3

[0070] Embodiment 3, the present embodiment ferrochromium alloy pellet roasting rectangular shaft furnace and its roasting method are basically the same as Example 1, the difference is that the roasting parameters are different, the specific method is as follows:

[0071] 1) Feeding, the ferrochrome green pellets are transported to the top of the drying bed 204 via a distributor, and the ferrochrome green pellets have a particle size of 10-25mm;

[0072] 2) drying, the ferrochrome green pellets transported to the drying bed 204 enters the pre-tropical zone 209 after being dried at 250° C. on the drying bed 204, and the drying time is 28 minutes;

[0073] 3) preheating, the ferrochrome green pellets that enter the preheating zone 209 are preheated at 450 ° C for 14 minutes in the preheating zone 209, and the ferrochrome green pellets enter the roasting zone 208 after preheating;

[0074] 4) roasting, the ferrochrome green pellets entering the roasting zone 208 are roasted at 12...

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Abstract

The invention relates to a rectangular shaft furnace for roasting ferrochromium pellets and a roasting method thereof. The rectangular shaft furnace comprises a roasting system, a dust collecting system, a collecting hopper, a combustion system and an air distribution system. The rectangular shaft furnace is characterized in that a shell is internally provided with a preheating band, a roasting band, a strengthening section, an air mixing section and an integral discharging section from top to bottom successively; an orifice of ejection of the shell is formed between the roasting band and thestrengthening band, and the integral discharging section communicates to the collecting hopper. The roasting method comprises the following steps: transporting raw ferrochromium pellets to the top ofa drying bed; feeding the raw ferrochromium pellets dried on the drying bed to the preheating band; feeding the raw ferrochromium pellets preheated by the preheating band to the roasting band; feedingthe raw ferrochromium pellets roasted by the roasting band to the strengthening section; feeding the raw ferrochromium pellets cooled, contracted and strengthened by the strengthening section to theair mixing section; feeding the raw ferrochromium pellets mixed with air to adjust the temperature in the air mixing section to the integral discharging section; and feeding the raw ferrochromium pellets to the collecting hopper from the integral discharging section to form finished product pellets and discharging the finished product pellets from a discharging nozzle to obtain the ferrochromium finished product pellets.

Description

technical field [0001] The invention relates to roasting of chrome ore green pellets, and relates to a rectangular shaft furnace for roasting ferrochrome alloy pellets and a roasting method thereof. Background technique [0002] With the continuous mining of earth resources, there are fewer and fewer high-grade lump ores that can be directly smelted in furnaces. Instead, they are replaced by selected high-grade finely ground chromium concentrates, but such ultra-fine concentrates cannot meet the requirements for furnace smelting. , the ball forming performance is good, the finer the fineness, the higher the strength of the green pellets. [0003] At present, there are mainly three types of equipment for chrome ore green pellet roasting: grate machine-rotary kiln, belt roaster and shaft furnace. Among them, the grate rotary kiln equipment not only has a large investment, but also has an unsatisfactory practical application effect for the roasting of chrome ore pellets; the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B1/00F27B1/08F27B1/10F27B1/12F27B1/16F27B1/18F27B1/20F27B1/21
CPCF27B1/005F27B1/08F27B1/10F27B1/12F27B1/16F27B1/18F27B1/20F27B1/21F27M2001/18F27M2001/02
Inventor 郭恩宇赵庆军高国平范莹吕庆东
Owner JILIN MECHANICAL & ELECTRICAL EQUIP
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