Technology for refining lead from lead chloride slag by means of pyrometallurgy

A lead chloride and process technology, which is applied in the field of extraction of metallic lead and lead chloride slag pyro-smelting process, can solve the problems of unsuccessful implementation and unreachable lead direct yield, and achieves good equipment sealing performance and separation. Simple and economical method, low heat loss effect

Inactive Publication Date: 2010-09-01
唐松云 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention has low smelting temperature, good airtightness of equipment, low energy consumption, and low lead volatilization, the direct recovery rate of lead must be as high as 4.2% to 4.41% and the leaching slag contains 43.35% to 44.31% lead. Less than 91.02%~90.81% claimed in the patent
The applicant of the present invention also arranged for a special trip to inspect the company where the applicant of CN 101613806A was located, and found that the above method was not successfully implemented

Method used

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  • Technology for refining lead from lead chloride slag by means of pyrometallurgy
  • Technology for refining lead from lead chloride slag by means of pyrometallurgy

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0016] Reference attached figure 1 A kind of lead chloride slag fire method lead smelting process, its concrete process is:

[0017] (1) First, mix 1t of lead chloride slag with 0.3t of lime and 0.06t of carbon powder into the reaction furnace consisting of a combustion chamber, a high-temperature zone, a low-temperature zone, and a flue; add coal from the combustion chamber of the reaction furnace to burn Heating, low-temperature smelting in the low-temperature zone of the reaction furnace; the smelting temperature is 400°C, and the smelting time is 30 minutes; lead chloride slag and lime are melted and reacted in the low-temperature zone to generate lead hydroxide melt and calcium chloride slag; the reaction formula yes:

[0018] PbCl 2 +2CaOH→Pb(OH) 2 +2CaCl 2

[0019] (2) Lead hydroxide melt and calcium chloride slag flow to the high temperature zone of the reaction furnace immediately, and the furnace temperature in the high temperature zone is controlled at 800°C; u...

Embodiment 2

[0030] Reference attached figure 1 A kind of lead chloride slag fire method lead smelting process, its concrete process is:

[0031] (1) First, mix 1t of lead chloride slag with 0.32t of lime and 0.07t of carbon powder into the reaction furnace consisting of a combustion chamber, a high-temperature zone, a low-temperature zone, and a flue; add coal from the combustion chamber of the reactor furnace to burn Heating, low-temperature smelting in the low-temperature zone of the reaction furnace; the smelting temperature is 450°C, and the smelting time is 25 minutes; lead chloride slag and lime are melted and reacted in the low-temperature zone to generate lead hydroxide melt and calcium chloride slag; the reaction formula yes:

[0032] PbCl 2 +2CaOH→Pb(OH) 2 +2CaCl 2

[0033] (2) Lead hydroxide melt and calcium chloride slag flow to the high temperature zone of the reaction furnace immediately, and the furnace temperature in the high temperature zone is controlled at 750°C; u...

Embodiment 3

[0044] Reference attached figure 1 A kind of lead chloride slag fire method lead smelting process, its concrete process is:

[0045] (1) First, mix 2t of lead chloride slag with 0.59t of lime and 0.13t of carbon powder into the reaction furnace composed of combustion chamber, high temperature zone, low temperature zone and flue; add coal from the combustion chamber of the reaction furnace to burn Heating, low-temperature smelting in the low-temperature zone of the reaction furnace; the smelting temperature is 500°C, and the smelting time is 40 minutes; lead chloride slag and lime are melted and reacted in the low-temperature zone to generate lead hydroxide melt and calcium chloride slag; the reaction formula yes:

[0046] PbCl 2 +2CaOH→Pb(OH) 2 +2CaCl 2

[0047] (2) Lead hydroxide melt and calcium chloride slag flow to the high temperature zone of the reaction furnace immediately, and the furnace temperature in the high temperature zone is controlled at 770°C; under this ...

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Abstract

The invention relates to a technology for refining lead from lead chloride slag by means of pyrometallurgy, belonging to the technical field of the smelting and the producing of the lead. The technology comprises the following steps of: mixing lead chloride slag, lime and carbon powder, and adding mixture into a reacting furnace; adding coal in a burning room of the reacting furnace, and burning and heating; smelting at low temperature; producing coarse lead, calcium chloride slag and furnace smoke; spraying the furnace smoke, purifying, and exhausting; and purifying and clarifying the spraying water, wherein the precipitate-separated water is reused as the spraying water, and the precipitate is returned to the reacting furnace to smelt. The technology can realize benefits of energy saving, emission reduction, high efficiency, high direct recovery rate and low cost.

Description

technical field [0001] The invention relates to a process for extracting metallic lead from solid lead chloride, in particular to a lead chloride slag fire-method lead smelting process, which belongs to the technical field of lead smelting production. Background technique [0002] In the refining and purification process of bismuth and lead in the bismuth and lead smelting industry, a waste residue of lead chloride slag will inevitably be produced. Lead chloride slag is a chlorine-colored, odorless crystalline massive slag containing 60-70% lead. When the lead chloride slag is heated above 950°C, it sublimates into gaseous volatilization, and lead chloride is soluble in water. So far, the existing technology does not have a better process for treating lead chloride slag, so the bismuth and lead smelters in the country do not handle the produced lead chloride slag effectively, and it is almost in a state of accumulation and storage. This is also a huge waste of national reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/02
CPCY02P10/20
Inventor 袁汝平
Owner 唐松云
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