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A lead smelting method using pulverized coal as injection fuel for Isa furnace

An Isa furnace and pulverized coal technology, which is applied in the field of smelting lead, can solve the problems of high cost of crude lead, expensive diesel oil, and large consumption, and achieve the effect of sufficient redox reaction, favorable matching, and simple operation

Active Publication Date: 2018-01-05
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the lead smelting process of the Isa furnace, diesel is currently used as the injection fuel. Although the smelting effect is good, the cost of crude lead is high due to the high price of diesel and the large amount used in the smelting process.

Method used

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  • A lead smelting method using pulverized coal as injection fuel for Isa furnace
  • A lead smelting method using pulverized coal as injection fuel for Isa furnace
  • A lead smelting method using pulverized coal as injection fuel for Isa furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take the input material 10.5t / h as an example.

[0027] A method for smelting lead by using pulverized coal as the injection fuel of the Isa furnace, the specific steps are:

[0028] 1) Put 5t of lead concentrate, 1.5t of high-lead fumes, 4t of roasted lead slag, and appropriate proportions of flux and crushed coal into the furnace from the charging port on the top of the furnace through a quantitative feeder and a belt conveyor to control the dust. The coal volume is 1.4-1.9t / h, and the process air volume is 6-8m 3 / s, the pressure is 160±10KPa; the oxygen consumption is 0.5-2.0m 3 / s, the pressure is 200-240KPa, according to SiO 2 / Fe=0.6-1.0, CaO / SiO 2 =0.3-0.7 to control the amount of flux added. The crushed coal is controlled according to different stages of smelting; during the control process, pay attention to controlling the position of the spray gun to ensure that the spray gun is in a proper position in the molten pool. Quality requirements for pulverized...

Embodiment 2

[0033] Take the input material 47.5t / h as an example.

[0034] A method for smelting lead by using pulverized coal as the injection fuel of the Isa furnace, the specific steps are:

[0035] 1) Put 25t of lead concentrate, 7.5t of high-lead fume, 15t of roasted lead slag, together with appropriate proportion of flux and crushed coal, through the quantitative feeder and belt conveyor, and put them into the furnace from the charging port on the top of the furnace to control the dust. The coal volume is 1.4-1.9t / h, and the process air volume is 6-8m 3 / s, the pressure is 160±10KPa; the oxygen consumption is 0.5-2.0m 3 / s, the pressure is 200-240KPa, according to SiO 2 / Fe=0.6-1.0, CaO / SiO 2 =0.3-0.7 to control the amount of flux added. The crushed coal is controlled according to different stages of smelting; during the control process, pay attention to controlling the position of the spray gun to ensure that the spray gun is in a proper position in the molten pool. Quality re...

Embodiment 3

[0040] Taking the input material 42t / h as an example, its composition is shown in Table 1.

[0041] Table 1 Composition of materials input to ISA furnace

[0042]

[0043] A method for smelting lead by using pulverized coal as the injection fuel of the Isa furnace, the specific steps are:

[0044] 1) Put 20t of lead concentrate, 7t of high-lead fumes, 15t of roasted lead slag, together with an appropriate proportion of flux and crushed coal, through the quantitative feeder and belt conveyor, and add them into the furnace from the charging port on the top of the furnace to control the pulverized coal The volume is 1.4-1.9t / h, and the process air volume is 6-8m 3 / s, the pressure is 160±10KPa; the oxygen consumption is 0.5-2m 3 / s, the pressure is 200-240KPa, according to SiO 2 / Fe=0.6-1.0, CaO / SiO 2 =0.3-0.7 to control the amount of flux added. The crushed coal is controlled according to different stages of smelting; during the control process, pay attention to controll...

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Abstract

The invention relates to a lead smelting method adopting pulverized coal as injection fuel in ISA furnaces, belonging to the technical field of pyrometallurgy. The method adopts the modes of continuous feeding and intermittent slag and lead discharge and comprises the following steps: 1) continuously adding lead concentrate, roasted lead slag, a flux, a slag former and a reducing agent to an oxygen-enriched top blowing furnace to be smelted; 2) sending the fuel in a spray gun into the spray gun by a Clyde pulverized coal system and injecting the fuel into a molten pool via a pulverized coal pipeline to sharply react with oxygen-enriched air to generate heat; 3) mixing loose coal used as the reducing agent with the raw materials and adding the mixture to the furnace; 4) adjusting the pulverized coal injection amount and the lifting height of the spray gun according to the temperature and height of the molten pool; 5) after separating lead and the slag, reducing the addition of the loose coal, adjusting the temperature of the molten pool, entering the stages of slag discharge and lead discharge and sending flue gases to an acid making system after waste heat and smoke dust in the flue gases are recovered by a waste heat boiler and an electric dust collector. As the pulverized coal is adopted as the fuel, the method is economical and low-carbon. The method operates efficiently, is simple to operate and has achieved industrial application.

Description

technical field [0001] The invention belongs to the technical field of pyrometallurgy, and in particular relates to a lead smelting method using pulverized coal as the injection fuel of an Isa furnace. Background technique [0002] Isa furnace lead smelting technology belongs to the category of top-blown molten pool smelting technology and belongs to direct lead smelting technology. At present, the direct lead smelting processes commonly used include Kiefset method, QSL method, Isa furnace lead smelting method, Kaldor furnace lead smelting method and Shuikoushan lead smelting method. Isa furnace lead smelting method is an emerging smelting technology , has the advantages of high degree of automation, strong adaptability of raw materials, and high environmental protection benefits. However, in the lead smelting process of the Isa furnace, diesel is currently used as the injection fuel. Although the smelting effect is good, the cost of crude lead is high due to the high price...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B13/02
CPCY02P10/20
Inventor 孙成余贾著红保自坤蒋荣生庄福礼俞兵杨伟金明康张云良张成江孙祖禄王勇肖毕高赵常青张龙陈晓忠
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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