Electric nickel furnace smelting (2)

1. Calculation of fluidized bed energy rate and desulfurization rate The fluidized bed energy rate is the amount of concentrate per square meter of furnace bed per day. It depends on the linear velocity of the deuterated bed and the amount of air required per ton of concentrate, calculated from the production of interagency data:

The fluidized roasting desulfurization rate can be calculated according to the sulfur content of the concentrate and the determined low niobium grade, which is generally calculated by the following formula:

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The main technical parameters of the fluidized roasting process are as follows.

        In the table      Main technical parameters of fluidized roasting process

Serial number

name

unit

Numerical value

Remarks

1

Hearth area

m 2

9 (7.5)

　

2

Bed height

t/(m 2 .d)

~ 130

　

3

Fluidization height

m

1. 4~ 1.7

　

4

Fluidization temperature

°C

65 0±20

　

5

Bed linear speed

m/s

2.5 6~ 2.85

　

6

Eye rate

%

1.33

　

7

Air volume (standard)

m 3 /h

2100 0～ 23000

　

8

Blast pressure

Pa

~ 1. 5×10 3

　

9

Inlet air temperature

°C

Normal temperature

　

10

Average particle size of the incoming material

Mm

2

8mm maximum

11

Influent material moisture content

%

6 to 8

　

12

Total smoke volume (standard)

m 3 /h

2450 0～ 28000

　

13

Flue gas outlet temperature

°C

~ 650

　

During the roasting process, a large amount of heat is released, and the temperature can be maintained at 600 to 700 ° C. The bed temperature fluctuation range can be ±20 ° C by automatic control, and the control bed temperature (650 ± 20) ° C in production. The means for instantaneously adjusting the temperature of the fluidization furnace include: 1 keeping the air volume constant, changing the feed material; 2 returning the fluidized bed layer with the cooled calcined product or quartz stone; 3 spraying the water to the fluidized bed layer to cool down. The height of the fluidized bed has a certain influence on the roasting effect. Appropriately increasing the height of the bed can improve the stability of the fluidized bed and increase the residence time of the material in the furnace, which is conducive to meeting the reaction conversion rate and ensuring product quality. . If the bed is too high, the resistance will increase, which will increase the power consumption. The height of the controlled fluidized bed in production is 1.4 to 1.7 m. The straight line speed of the bed is to achieve the line speed of the bed should be greater than the minimum critical speed of the particles, but also one color is smaller than the take-off speed of the particles. Generally, the W operation = (0.25 ~ 0.6) W is taken out. In the production, the average particle size of 2mm into the furnace particles, the line speed of 2.56 ~ 2.85m / s; bed height of about 1.5m, the bed energy rate is about 130t / (m 2 .d), soot defense is 30% ~ 90% (when granulation is roasting, the soot rate can be reduced to 5% to 24%).

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