Method for reducing content of lead contained in slag by locally oxygenating side-blowing reduction furnace

A reduction furnace and oxygen supplement technology, which is applied in furnaces, charge materials, crucible furnaces, etc., can solve the problems of inability to adjust the redox atmosphere in local side-blown reduction furnaces, and high lead content in the slag, and achieve high slag temperature and fluidity. Effect

Active Publication Date: 2018-10-09
广西南丹南方金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention overcomes the technical problem in the prior art that the oxidation-reduction atmosphere cannot be adjusted in the partial side-blown reduction furna...

Method used

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  • Method for reducing content of lead contained in slag by locally oxygenating side-blowing reduction furnace
  • Method for reducing content of lead contained in slag by locally oxygenating side-blowing reduction furnace

Examples

Experimental program
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Embodiment 1

[0028] to combine figure 1 with figure 2 , the structure of the side-blowing reduction furnace used in this embodiment is: it is composed of a hearth 1, a furnace body 2, and a furnace roof 3; the hearth 1 is made of refractory materials, and the part above the hearth is the furnace body 2. Furnace body 2 is spliced ​​by one layer of steel water jacket and three layers of copper water jacket. From bottom to top, it is the first layer of copper water jacket 4, the second layer of copper water jacket 5, the third layer of copper water jacket 6 and Copper water jacket 7; several primary tuyeres 8 are provided on both sides of the first layer of copper water jacket of the furnace body, which are used to blow oxygen-enriched air into the molten slag layer, and the third layer of copper water jacket 6 on both sides of the furnace body is provided with several A secondary tuyere 9 is used to blow a certain amount of air into the furnace to fully burn the combustible gas such as CO ...

Embodiment 2

[0037] The structure of the side-blowing reduction furnace used in this embodiment is the same as that in Embodiment 1.

[0038] The method for reducing the lead content in the slag by supplementing oxygen locally in the side-blowing reduction furnace includes the following steps:

[0039] (1) Oxygen control in the furnace:

[0040] Put the material and fuel into the side-blown reduction furnace, and supply oxygen to the side-blown reduction furnace through the supply pipe of the side-blown reduction furnace, that is, the primary tuyere 8 and the secondary tuyere 9, to control the overall oxygen flow in the furnace The mass percentage content is 62%; then connect the pure oxygen pipeline to supply oxygen from the two side tuyeres below the coal particle feed port, and control the oxygen mass concentration in the lower coal tuyere area A to be 75%;

[0041] (2) Temperature regulation:

[0042] After controlling the overall oxygen mass percentage in the furnace to 62%, adjust ...

Embodiment 3

[0046] The structure of the side-blowing reduction furnace used in this embodiment is the same as that in Embodiment 1.

[0047] The method for reducing the lead content in the slag by supplementing oxygen locally in the side-blowing reduction furnace includes the following steps:

[0048] (1) Oxygen control in the furnace:

[0049]Put the material and fuel into the side-blown reduction furnace, and supply oxygen to the side-blown reduction furnace through the supply pipe of the side-blown reduction furnace, that is, the primary tuyere 8 and the secondary tuyere 9, to control the overall oxygen flow in the furnace The mass percentage content is 64%; then connect the pure oxygen pipeline to supply oxygen from the two side tuyeres below the coal particle feed port, and control the oxygen mass concentration in the lower coal tuyere area A to be 74%;

[0050] (2) Temperature regulation:

[0051] After controlling the overall oxygen mass percentage in the furnace to 64%, adjust t...

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Abstract

The invention discloses a method for reducing the content of lead contained in slag by locally oxygenating a side-blowing reduction furnace. The method comprises the following steps: firstly, oxygen regulation in the furnace: pouring materials and fuel into the side-blowing reduction furnace, supplying oxygen to the side-blowing reduction furnace through an oxygen supply pipeline of the side-blowing reduction furnace and controlling the mass percent content of overall oxygen in the furnace at 45 to 65 percent; then connecting a pure oxygen pipeline for oxygenating through two side tuyeres under a coal particle feed opening and controlling the oxygen mass concentration of a low coal particle tuyere area at 65 to 75 percent; secondly, temperature regulation: controlling the mass percent content of the overall oxygen in the furnace at 45 to 65 percent, then adjusting the input amount of coal, controlling the temperature of the lower coal particle tuyere area at 1100 to 1300 DEG C and controlling the temperature from the middle of the furnace to a slag outlet at 1000 to 1200 DEG C; thirdly, slagging regulation: in the production operation, when the fluidity of the slag is poor due to low temperature, oxygenating at the tuyere of a siphon pool partition area, so as to ensure smooth outflow of the slag from the outlet. By using the method disclosed by the invention, the content of Pbcontained in the slag can be reduced from 3.5 to 4.5 percent to below 2.5 percent.

Description

technical field [0001] The invention relates to the technical field of side-blown oxidation-reduction furnaces for nonferrous metallurgy, in particular to a method for locally supplementing oxygen in side-blown reduction furnaces to reduce lead content in slag. Background technique [0002] In the existing lead smelting operation, the high-lead slag produced by the side-blown oxidation furnace enters the furnace from the top of the side-blown reduction furnace, and oxygen-enriched air is blown into the slag layer in the furnace from the primary tuyeres on both sides of the furnace body. Under the action of oxygen-enriched air, the high-lead slag, crushed coal, and flux are vigorously stirred and mixed evenly, and the reaction produces crude lead and slag. The lead droplets collide with each other and grow up, and the lead droplets gradually sink into the area with weak turbulence below the tuyere. , the secondary crude lead and slag flow into the siphon chamber for further c...

Claims

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Application Information

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IPC IPC(8): C22B13/02F27B14/04F27B14/08F27B14/20F27D7/02F27D19/00F27D25/00
CPCC22B13/02F27B14/04F27B14/08F27B14/20F27B2014/0818F27D7/02F27D19/00F27D25/00F27D2019/004F27D2019/0043F27M2003/13Y02P10/20
Inventor 周南方覃贾荆涛刘坚
Owner 广西南丹南方金属有限公司
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