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Lead skim reducing process

A lead slag and process technology, applied in the field of lead oxide slag reduction technology, can solve the problems of low lead yield, high capital construction investment, and high soot rate, and achieves improved total recovery rate, increased direct yield, and less pulverized coal consumption. Effect

Active Publication Date: 2010-09-22
CHINA ENFI ENGINEERING CORPORATION +1
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Problems solved by technology

This method is basically equivalent to the reduction section of the QSL method, except that the reducing agent is different. Although the problem of heat utilization of lead oxide slag is solved, a large amount of heat energy required for the reduction reaction in the furnace must be obtained by burning natural gas or coal gas.
Therefore, a large amount of natural gas or gas is required, and the price of natural gas and gas is relatively expensive, so the cost is high
In addition, the amount of flue gas produced is large, the dust rate is high, the direct recovery rate of lead is low, the recovery effect is poor, the heat taken away by the high-temperature flue gas is large, and the energy consumption increases accordingly. The infrastructure investment for recovering this part of waste heat is relatively high, resulting in waste

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Embodiment Construction

[0027] The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0028] Refer below Figure 1-4 A lead slag reduction furnace for implementing the lead slag reduction process of the present invention is described.

[0029] Such as figure 1 As shown, the lead slag reduction furnace includes a furnace body 1 , a support 4 , a pulverized coal spray gun 6 and an electrode 7 . The lead slag reducing furnace of the present invention can be used for processing lead slag, such as high lead oxide slag with a lead content of 25%-45%. It should be noted that since the lead slag reduction furnace is equipped with the electrode 7, it can also process lead-containing secondary materials and lead oxide ore. In other words, the lead slag reduction furnace can be used for lead smelting and not limited to processing lead slag.

[0030] Such as Figure 1-4 As shown, in ...

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Abstract

The invention discloses a lead skim reducing process, comprising the following steps: adding flux and fused lead skim into the hearth of a lead skim reducing furnace; heating the materials in the hearth by utilizing an electrode; spraying powder coal into the furnace from the bottom of the lead skim reducing furnace; and respectively discharging rough lead, waste slag and smoke from a lead discharging port, a slag tap and a smoke outlet. The reducing process of the invention has small needed powder coal amount, small smoke amount, low soot rate, high lead recovery rate and low cost.

Description

technical field [0001] The invention relates to a lead slag reduction process, in particular to a lead oxide slag reduction process. Background technique [0002] Traditional crude lead smelting processes mainly include QSL method, SKS method, Kivcet method, top-blown submerged bath smelting technology (mainly Ausmelt method and ISA method) and Kaldor method. QSL method, top-blown submerged bath smelting technology and Kaldor method are all one-step lead smelting methods. Lead sulfide concentrate is put into the furnace for oxidation and smelting, and part of crude lead and lead oxide slag are generated, and the lead oxide slag continues to be reduced in the furnace. Smelting produces crude lead and final slag. Both the QSL method and the Kaldor method have been applied in industry, but the soot rate in the reduction stage is as high as 30%-35%, causing a large amount of lead to circulate in the system, and the economic indicators are poor. The operation mode of Ausmelt wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B5/10C22B13/02C22B4/04
CPCY02P10/20
Inventor 陆志方李东波蒋继穆张振民尉克俭何秋安邓兆磊索云峰李栋王忠实桂江王建铭刘家楣崔大韡何志军孙富有
Owner CHINA ENFI ENGINEERING CORPORATION
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