Oxygen-rich blowing technology for producing coarse lead and matte from lead matte in top-blowing furnace

A lead matte and top-blowing furnace technology, applied in furnaces, electric furnaces, rotary drum furnaces, etc., to achieve the effects of low operating costs, reduced emissions, and high smelting recovery

Inactive Publication Date: 2014-07-23
YUNNAN TIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Up to now, there is no practice and related reports of using top-blowing furnace to treat lead matte, so it is necessary to explore a simple production process with high recovery rate

Method used

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  • Oxygen-rich blowing technology for producing coarse lead and matte from lead matte in top-blowing furnace

Examples

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Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: A 300mm deep lead smelting FeO-SiO is left in a top-blowing furnace with an inner diameter of 5m 2 -CaO ternary slag starting pool, slag FeO / SiO 2 The weight ratio is 0.9, CaO / SiO 2 The weight ratio is 0.8, and the silicic acidity is 1.24; the lead matte with the mixture of lead sulfide and copper sulfide as the main component is continuously put into the top-blowing furnace at a rate of 50t / h, and the blowing temperature is controlled between 1200 and 1250 °C . According to the sulfur content of the lead matte, the sulfur in the lead sulfide in the lead matte is completely oxidized to SO 2 According to the chemical reaction requirements, calculate the amount of oxygen that needs to be added per unit time, add oxygen-enriched air from the spray gun, and carry out continuous oxidation and blowing for 6 hours. Through oxygen-enriched air oxidation blowing, the lead sulfide in the lead matte is oxidized to lead oxide, and at the same time, part of the lead ...

Embodiment 2

[0015] Example 2: In a top-blowing furnace with an inner diameter of 5m, there is a 350mm deep lead smelting FeO-SiO 2 -CaO ternary slag starting pool, slag FeO / SiO 2 The weight ratio is 1.0, CaO / SiO 2 The weight ratio is 0.6, and the silicic acidity is 1.35; the lead matte with the mixture of lead sulfide and copper sulfide as the main component is continuously put into the top-blowing furnace at a rate of 55t / h, and the blowing temperature is controlled between 1180 and 1260 °C . According to the sulfur content of the lead matte, the sulfur in the lead sulfide in the lead matte is completely oxidized to SO 2 According to the chemical reaction requirements, calculate the amount of oxygen that needs to be added per unit time, add oxygen-enriched air from the spray gun, and carry out continuous oxidation and blowing for 5.5 hours. Through oxygen-enriched air oxidation blowing, the lead sulfide in the lead matte is oxidized to lead oxide, and at the same time, part of the l...

Embodiment 3

[0016] Example 3: A 300mm deep lead smelting FeO-SiO is left in a top-blowing furnace with an inner diameter of 5m 2 -CaO ternary slag starting pool, slag FeO / SiO 2 The weight ratio is 1.2, CaO / SiO 2 The weight ratio is 0.7, and the silicic acidity is 1.14; the lead matte with the mixture of lead sulfide and copper sulfide as the main component is continuously put into the top-blowing furnace at a speed of 60t / h, and the blowing temperature is controlled between 1200 and 1250°C . According to the sulfur content of the lead matte, the sulfur in the lead sulfide in the lead matte is completely oxidized to SO 2 According to the chemical reaction requirements, calculate the amount of oxygen that needs to be added per unit time, add oxygen-enriched air from the spray gun, and carry out continuous oxidation and blowing for 5.5 hours. Through oxygen-enriched air oxidation blowing, the lead sulfide in the lead matte is oxidized to lead oxide, and at the same time, part of the lea...

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Abstract

The invention specifically relates to an oxygen-rich blowing technology for producing coarse lead and matte from lead matte in a top-blowing furnace, and belongs to the technical filed of nonferrous metal metallurgy. The technology comprises the following steps: leaving a FeO-SiO2-CaO three-element primary molten pool in a top-blowing furnace, continuously adding lead matte into the furnace, controlling the blowing temperature, spraying quantitative oxygen gas from a spray gun to carry out continuous oxidation blowing by adding, wherein the amount of the oxygen gas is calculated so as to completely covert the sulfur of the lead sulfide in the lead matte to SO2; stopping adding lead matte and oxygen-rich air after the top blowing is over, directly adding a reducing agent to carry out reduction smelting on liquid lead slag; wherein during the blowing process and the lead slag reduction smelting process, a mixture of molten coarse lead and copper sulfide is discharged out, cooling and settling the mixture in a lead boiler in front of the furnace, fishing out the copper sulfide in a solid matte form, and transporting the liquid coarse lead to a lead refining system. The technology has the advantages of high production efficiency, high lead and copper recovery rate, low cost, reduced discharge, and environment-friendliness.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a process technology for producing rough lead and matte by oxygen-enriched blowing of lead matte in a top-blown furnace. Background technique [0002] In the crude lead smelting process, a lead matte is often produced, which is mainly a mixture of lead sulfide and copper sulfide, generally containing Pb40%-80%, Cu5%-20%, S7-18%. [0003] In the traditional production process, this kind of lead matte is generally smelted by the combined process of reverberatory furnace and blast furnace to recover lead and copper. In the process of reverberatory furnace smelting and blast furnace smelting, the method of smelting by adding flux is generally used for smelting. In reverberatory furnace smelting, fluxes such as iron filings, iron oxide, pyrite, soda, and quartz sand are generally added, and lead is first replaced and reduced for smelting by means of iron replacem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/02C22B15/00
Inventor 宋兴诚杨继生王建伟李俊杰李雍赵勇孔正国彭林熊义期李成学李正永白家福
Owner YUNNAN TIN
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