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Thermal compensation method for slag bath carbothermic reduction slag pool

A technology of thermal compensation and slag pool, applied in the field of thermal compensation, can solve problems such as low heat transfer efficiency, and achieve the effects of improving heat transfer efficiency, reducing energy consumption, and compensating for temperature drop in the slag pool

Active Publication Date: 2019-05-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Method ③ Although it is a feasible method for thermal compensation to the slag pool, the heat transfer mode between the high-temperature furnace gas above the slag pool and the slag pool is mainly radiation heat exchange, and the heat transfer is only through the surface of the slag pool. lower

Method used

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  • Thermal compensation method for slag bath carbothermic reduction slag pool

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Experimental program
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Effect test

Embodiment 1

[0044] Two upper oxygen lances 5 are evenly arranged on the side wall circumference of the upper space 2 of the melting furnace 1, the angle between the upper oxygen lance 5 and the horizontal plane is 30°, and it is inclined downward, and the outlet of the upper oxygen lance 5 is far from the upper part of the melting furnace 1 The horizontal distance L of the side wall of space 2 1 For the upper space 2 radius D 1 1 / 5 of the vertical distance h between the outlet of the upper oxygen lance 5 and the upper surface of the slag pool 1 is the height H of the upper space 2 1 1 / 3 of. Use the upper oxygen lance 5 with an inner diameter of 150mm to spray the upper space 2 of the melting furnace 1 with a pressure of 0.1MPa and a single flow rate of 2.0Nm 3 Oxygen in / s is used to burn CO and H in the upper space furnace gas escaped from the slag pool 3 2 , the oxygen velocity at the outlet of the upper oxygen lance 5 is 113m / s. The furnace gas temperature in the upper space 2 is ...

Embodiment 2

[0047] On the circumference of the side wall of the upper space 2 of the melting furnace 1, three upper oxygen lances 5 are evenly arranged. The angle between the upper oxygen lance 5 and the horizontal plane is 35°, and it is inclined downward. The outlet of the upper oxygen lance 5 is far from the upper part of the melting furnace 1. The horizontal distance L of the side wall of space 2 1 For the upper space 2 radius D 1 1 / 4 of the vertical distance h between the outlet of the upper oxygen lance 5 and the upper surface of the slag pool 1 is the height H of the upper space 2 1 1 / 2 of. The upper oxygen lance 5 with an inner diameter of 160mm is used to spray the upper space area 2 of the melting furnace 1 with a pressure of 0.2MPa and a single flow rate of 2.5Nm 3 Oxygen in / s is used to burn CO and H in the upper space furnace gas escaped from the slag pool 3 2 , the oxygen velocity at the outlet of the upper oxygen lance 5 is 124m / s, and the temperature of the furnace ga...

Embodiment 3

[0050] On the circumference of the side wall of the upper space 2 of the melting furnace 1, three upper oxygen lances 5 are evenly arranged. The angle between the upper oxygen lance 5 and the horizontal plane is 40°, and it is inclined downward. The outlet of the upper oxygen lance 5 is far from the upper space of the melting furnace. 2 The horizontal distance L of the side wall 1 For the upper space 2 radius D 1 1 / 3 of the vertical distance h between the outlet of the upper oxygen lance 5 and the upper surface of the slag pool 3 1 is the height H of the upper space 2 1 1 / 2 of. Use the upper oxygen lance 5 with an inner diameter of 170mm to spray the upper space 2 of the melting furnace 1 with a pressure of 0.2MPa and a single flow rate of 3.0Nm 3Oxygen in / s is used to burn CO and H in the upper space furnace gas escaped from the slag pool 3 2 , the oxygen velocity at the outlet of the upper oxygen lance 5 is 132m / s, and the temperature of the furnace gas in the upper spa...

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Abstract

The invention provides a thermal compensation method for a slag bath carbothermic reduction slag pool. A smelting furnace is used as a slag bath carbothermal reduction reactor; a side oxygen lance isarranged on the side wall of the upper space of the smelting furnace, oxygen with the air pressure being 0.1-0.2MPa is blown into the upper space of the smelting furnace with the speed being higher than or equal to 100m / s for burning of CO and H2 in furnace gas, and thus the continuous high temperature of the furnace gas is ensured; an upper layer side blowing spray gun and a lower layer side blowing spray gun are arranged on the side wall of the smelting furnace slag pool, the inner diameter of the upper layer side blowing spray gun of the slag pool is 100-120 mm, nitrogen with the pressure being 0.4-0.6 MPa is blown into the slag pool area of the smelting furnace with the flow rate being 2.0-3.0 Nm<3> / s and the speed being higher than or equal to 250 m / s for splashing slag drop groups, after heat exchange of the slag drop groups with high temperature furnace gas in the upper space, heat is brought back to the slag pool; and the lower layer side blowing spray gun of the slag pool sprays pulverized coal to the smelting furnace slag pool for reduction reaction. Through the thermal compensation method for the slag bath carbothermic reduction slag pool, the slag pool can be subjectedto thermal compensation, the thermal compensation effect is good, and the effect that the slag pool carbothermal reduction reaction is continuously carried out can be ensured.

Description

technical field [0001] The invention relates to the technical field of heat compensation in a metallurgical process, in particular to a method for heat compensation of a slag pool for carbothermal reduction in a slag bath. Background technique [0002] Compared to the production of metals from metal oxides by solid-solid reduction or gas-solid reduction, slag-bath carbothermal reduction benefits from the solid-liquid reduction of molten metal oxides by solid carbon in the slag and from the slag bath The ultra-large reaction interface greatly improves the reaction efficiency. At the same time, because the slag bath carbothermal reduction is carried out in the slag pool, the reaction kinetics conditions are good, and liquid metal can be produced in one step. It has the advantages of simple process and high reduction rate, and is widely used in primary metal minerals and secondary metallurgy. Extraction of valuable metals from resources. But the slag bath carbothermal reducti...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B5/10
CPCY02P10/20
Inventor 王楠陈敏徐进徐磊邓浩华
Owner NORTHEASTERN UNIV