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Flash smelting method for lead

A flash smelting and lead sulfide technology, applied in the field of non-ferrous metals, to achieve the effect of reducing the amount of high-temperature flue gas, large production capacity, and efficient utilization of resources

Inactive Publication Date: 2008-09-10
YUNNAN METALLURGICAL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Nowadays, the requirements for energy saving and emission reduction of enterprises are becoming more and more stringent. The above-mentioned processes have environmental, energy consumption and safety problems in different aspects. device innovation

Method used

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  • Flash smelting method for lead

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Spray the powdered lead sulfide concentrate with 8% water content before drying and 0.3% water content after drying with oxygen containing 50% oxygen and 25°C air supply temperature into the space of a high-temperature reaction tower 2 through nozzle 1, forming In the floating state, the input amount of oxygen is controlled so that the oxidation rate of lead sulfide is 60%, the oxidation process of lead sulfide is completed, and the generated melt falls in the sedimentation tank 3 below the reaction tower 2;

[0022] (2) Through the interactive reaction and reduction reaction of lead oxide and lead sulfide, 98% of crude lead and slag are continuously generated; silver is enriched in crude lead, and the recovery rate of silver is 97%;

[0023] (3) crude lead and slag are respectively discharged from the lead outlet 4 and the slag outlet 5 after being clarified and stratified in the sedimentation tank 3, and the slag contains 4% lead and is discarded;

[0024] (4) The...

Embodiment 2

[0026] (1) Spray the powdered lead sulfide concentrate with 8% water content before drying and 0.3% water content after drying with 60% oxygen and 25°C air supply temperature into the space of a high-temperature reaction tower 2 through nozzle 1, forming In the floating state, the input amount of oxygen is controlled, so that the oxidation rate of lead sulfide is 80%, the oxidation process of lead sulfide is completed, and the generated melt falls in the sedimentation tank 3 below the reaction tower 2;

[0027] (2) Through the interactive reaction and reduction reaction of lead oxide and lead sulfide, 97% of crude lead and slag are continuously generated; silver is enriched in crude lead, and the recovery rate of silver is 97.5%;

[0028] (3) crude lead and slag are respectively discharged from the lead outlet 4 and the slag outlet 5 after being clarified and stratified in the sedimentation tank 3, the slag contains 25% lead, and after the slag is reduced by the blast furnace, ...

Embodiment 3

[0031] (1) Spray the powdered lead sulfide concentrate with 8% water content before drying and 0.3% water content after drying with 70% oxygen and 25°C air supply temperature into the space of a high-temperature reaction tower 2 through nozzle 1, forming In the floating state, the input amount of oxygen is controlled so that the oxidation rate of lead sulfide is 70%, the oxidation process of lead sulfide is completed, and the generated melt falls in the sedimentation tank 3 below the reaction tower 2;

[0032] (2) Through the interactive reaction and reduction reaction of lead oxide and lead sulfide, crude lead 97.5% and slag are continuously generated; silver is enriched in crude lead, and the recovery rate of silver is 96%;

[0033] (3) Crude lead and slag are respectively discharged from lead outlet 4 and slag outlet 5 after clarification and stratification in sedimentation tank 3. The slag contains 10% lead and is sent to beneficiation after slow cooling to obtain tailings ...

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Abstract

The invention relates to a lead flash smelting method, belonging to the nonferrous metal field. The technique comprises the following steps that: the dried powder lead sulphide ore concentrate and the oxygen are injected into the space of a high temperature reaction tower and are in a floating state, the input amount of the oxygen is controlled to ensure that the oxidation rate of the lead sulphide ranges from 60 to 80 percent, the oxidization process of the lead sulphide is finished, the generated fused mass falls on a sedimentation tank below the reaction tower; the lead matte and the furnace slag are generated continuously by the interreaction and the reduction reaction of the lead oxide and the lead sulphide and are discharged from a lead discharging port and a slag discharging port respectively after the carilification, the furnace slag with low lead content can be discarded or is processed further; the flue gas enters an afterheat boiler through a flue and is sent to a device of recycling sulfur. The method has short flow and great productivity as well as safe production, saves energy, protects the environment, uses the resources effectively and is continuous and sanitary and stable.

Description

technical field [0001] The invention belongs to the field of nonferrous metals, and more specifically relates to a method for smelting lead sulfide concentrate. Background technique [0002] Lead is an important basic raw material for the development of the national economy. China is the world's largest lead producer and the second largest lead consumer after the United States. [0003] The traditional lead smelting process is "sintering-blast furnace method". Due to its high energy consumption and pollution problems, it is being phased out. [0004] The new processes that emerged in modern times and have been applied in industry mainly include the "oxygen bottom blowing method" (Q.S.L) invented in Germany and the "Kivcet method" (Kivcet) invented in the former Soviet Union. The "Oxygen Bottom Blowing (Top Blowing)-Slag Blast Furnace Re-reduction" process, which is innovatively developed in my country, has also been successful in recent years. [0005] Nowadays, the requi...

Claims

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Application Information

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IPC IPC(8): C22B13/00
Inventor 王吉坤张文海董英章晓波
Owner YUNNAN METALLURGICAL GROUP
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