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Pyrogenic attack comprehensive recovery process for lead and silver slag leached from bismuth oxide slag

A technology of pyroprocessing and bismuth oxide slag, which is applied in the direction of improving process efficiency and can solve the problem of low direct metal recovery rate

Inactive Publication Date: 2011-06-01
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the direct yield of metal is also very low

Method used

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  • Pyrogenic attack comprehensive recovery process for lead and silver slag leached from bismuth oxide slag
  • Pyrogenic attack comprehensive recovery process for lead and silver slag leached from bismuth oxide slag

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The pyroprocessing comprehensive recovery process of lead-silver slag leached from bismuth oxide slag in this embodiment comprises the following major steps:

[0028] (1) the lead-silver slag is crushed, and evenly mixed by the mass ratio of lead-silver slag: industrial sodium carbonate: anthracite=100: 35: 8;

[0029] (2) Add the mixed materials into the reverberatory furnace hearth from the feed port;

[0030] (3) Heat up to 650°C with a coal block and keep warm for 0.5h;

[0031] (4) continue to heat to 1050 ℃, keep warm for 1.5h, so that the whole lead and silver slag can be melted completely as far as possible;

[0032] (5) release the slag on the melt surface;

[0033] (6) after the slagging is completed, the molten lead-silver liquid is put into the lead bucket, and the scum above the lead liquid is removed; cooling obtains the lead-silver alloy;

[0034] (7) Return the slag released from step (5) and the scum or ingredients produced by step (6) to the reverbe...

Embodiment 2

[0036] The pyroprocessing comprehensive recovery process of lead-silver slag leached from bismuth oxide slag in this embodiment comprises the following major steps:

[0037] (1) lead-silver slag is broken, by lead-silver slag: industrial sodium carbonate: the mass ratio of anthracite=100: 40: 10 is evenly mixed;

[0038] (2) Add the mixed materials into the reverberatory furnace hearth from the feed port;

[0039] (3) Heat up to 700°C with coal block and keep warm for 2.5h;

[0040] (4) continue to heat to 1100 ℃, keep warm for 2.5h, so that the whole lead and silver slag can be melted completely as far as possible;

[0041] (5) release the slag on the melt surface;

[0042] (6) after the slagging is completed, the molten lead-silver liquid is put into the lead bucket, and the scum above the lead liquid is removed; cooling obtains the lead-silver alloy;

[0043] (7) Return the slag released from step (5) and the scum or ingredients produced by step (6) to the reverberatory ...

Embodiment 3

[0045] The pyroprocessing comprehensive recovery process of lead-silver slag leached from bismuth oxide slag in this embodiment comprises the following major steps:

[0046] (1) lead-silver slag is broken, by lead-silver slag: industrial sodium carbonate: the mass ratio of anthracite=100: 30: 9 is evenly mixed;

[0047] (2) Add the mixed materials into the reverberatory furnace hearth from the feed port;

[0048] (3) Heating the temperature to 600°C with a coal block and keeping it warm for 1 hour;

[0049] (4) continue to heat to 1000 ℃, keep warm for 2 hours, so that the whole lead and silver slag can be melted completely as far as possible;

[0050] (5) release the slag on the melt surface;

[0051] (6) after the slagging is completed, the molten lead-silver liquid is put into the lead bucket, and the scum above the lead liquid is removed; cooling obtains the lead-silver alloy;

[0052] (7) Return the slag released from step (5) and the scum or ingredients produced by st...

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Abstract

The invention relates to a pyrogenic attack comprehensive recovery process for lead and silver slag leached from bismuth oxide slag and belongs to the field of metallurgy. In the method, anthracite serves as a reducing agent and industrial sodium carbonate serves as a slag forming constituent to convert lead chloride in the lead and silver slag leached from the bismuth oxide slag into lead carbonate; the lead carbonate is decomposed into lead oxide; lead is reclaimed by the principle that carbon in the anthracite and the lead oxide are subjected to reduction reaction to generate elementary lead; because of the sodium chloride generated in the reaction, the melting point of the slag is reduced and then the slag and the lead are more thoroughly separated; and the silver and the lead in the lead and silver slag leached from the bismuth oxide slag are reclaimed together by the principle that the lead is a good collector of silver and silver can be dissolved in liquid lead in a molecular state. At the same time, the other impurity metals, such as stibium, bismuth and the like in the lead and silver slag, are also subjected to the similar reaction and then are reduced into a lead and silver alloy.

Description

technical field [0001] The invention relates to pyrometallurgical processes in the field of metallurgy, in particular to a comprehensive recovery process for pyroprocessing lead-silver slag leached from bismuth oxide slag. Background technique [0002] The smelter uses the bismuth slag produced by silver oxidation and refining as raw material to produce refined bismuth. In the process of leaching the bismuth slag with hydrochloric acid, a leaching slag containing 45-62% lead and 6900-16000g / t silver will be obtained. It is customarily called lead-silver slag, and in this application, it is called lead-silver slag leached from bismuth oxide slag. Since lead mainly exists in the form of lead chloride, this kind of slag is difficult to carry out further treatment, often causing environmental pollution and occupying the effective space of the plant. Therefore, general smelters have always sold the lead and silver slag directly to the outside world at a low price; however, in ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B13/02C22B11/02C22B30/06C22B30/02
CPCY02P10/20
Inventor 谢兆凤马辉刘万里张圣南曹永贵曹永德
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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