Smelting method for recycling lead, bismuth and precious metal from lead-containing tailings in acid making

A smelting method and precious metal technology, applied in the fields of smelting bismuth and precious metals and recovering lead, can solve problems such as serious environmental pollution, loss of valuable metals, and difficulty in mutual separation, and achieve high comprehensive recovery rate, high product quality, and easy process. Effect

Inactive Publication Date: 2018-01-09
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the wastewater and sediment formed by the alkali neutralization process not only pollute the environment, but also cause the loss of valuable metals such as copper and silver.
The blast furnace smelting process not only seriously pollutes the environment, but also distributes a large amount of valuable metals in various smelting slags, the direct recovery rate is not high and it is difficult to separate each other

Method used

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  • Smelting method for recycling lead, bismuth and precious metal from lead-containing tailings in acid making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Lead-containing tailings of wet acid production in a smelter (the main average composition is: Pb 48.85%, Bi 2.58%, Au 3.41%, Cu0.72%, Se 0.35%, As 0.16%, Ag 383g / t), the Put the lead tailings into the reduction smelting equipment, add a reducing agent containing 15% of the weight of the tailings containing lead, and a flux containing 25% of the weight of the tailings containing lead. Finally, separate the alloy from the smelting slag; put the alloy obtained by reduction smelting into the vacuum distillation equipment, control the vacuum degree <30Pa, and keep it at 1100°C for 1 hour to obtain a silver-rich alloy (Cu 19.76%, Ag 1.96%, Pb0.014 %, Bi 0.0069%) and lead-bismuth alloy (Pb 95.52%, Bi 3.84%), the silver-rich alloy returns to the precious metal smelting system to produce silver products, and the lead-bismuth alloy can be sold directly.

Embodiment 2

[0018] The lead-containing tailings of wet acid production in a smelter (the main average components are: Pb 50.56%, Bi 4.25%, Au 2.48%, Se0.46%, As 0.71%, Ag 313 g / t), the lead-containing tailings Put it into the reduction smelting equipment, add a reducing agent containing 20% ​​of the weight of the tailings containing lead, and a flux containing 20% ​​of the weight of the tailings containing lead. Separated from the smelting slag; put the alloy obtained by reduction smelting into the vacuum distillation equipment, control the vacuum degree <30Pa, and keep it at 1200°C for 1 hour to obtain a silver-rich alloy (Cu 22.78%, Ag 1.58%, Pb 0.17%, Bi 0.02 %) and lead-bismuth alloy (Pb 95.62%, Bi 4.25%), the silver-rich alloy returns to the precious metal smelting system to produce silver products, and the lead-bismuth alloy can be sold directly.

Embodiment 3

[0020] Lead-containing tailings of wet acid production in a smelter (the main average components are: Pb 58.13%, Bi 2.73%, Au 3.07%, Cu0.54%, As 1.03%, Ag 203 g / t), the lead-containing tailings Put it into the reduction smelting equipment, add a reducing agent with 15% of the weight of the lead-containing tailings, and a flux with 30% of the weight of the lead-containing tailings. The reducing agent is pulverized coal, and the flux is quartz, and heated to 1250 ° C. Separation of alloy and smelting slag; put the alloy obtained by reduction smelting into vacuum distillation equipment, control the vacuum degree <30Pa, and keep it at 1150°C for 1 hour to obtain a silver-rich alloy (Cu 20.14%, Ag 1.78%, Pb 0.065%, Bi 0.011%) and lead-bismuth alloy (Pb 95.38%, Bi 4.13%), the silver-rich alloy is returned to the precious metal smelting system to produce silver products, and the lead-bismuth alloy can be sold directly.

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Abstract

The invention discloses a smelting method for recycling lead, bismuth and precious metal from lead-containing tailings in acid making. The method comprises the steps that smelting slag is separated after high-temperature reduction and smelting treatment of the lead-containing tailings generated by the acid-making technology, and high-lead alloy is produced; then, through a vacuum distillation technology, lead-bismuth alloy and silver-rich alloy are obtained, wherein the obtained lead-bismuth alloy meets the lead and bismuth content requirements of lead-bismuth products, and refining and impurity removal procedures are reduced; at the same time, the lead and bismuth losses are also reduced; thus, with the method disclosed by the invention, the production cost is reduced, and the recovery rate of the precious metal is improved; the lead and bismuth recovery cycles are shortened, and the lead and bismuth recovery values are improved; manufactured products are high in quality; at the sametime, according to the method disclosed by the invention, the metal recycling separation can be achieved completely, and the comprehensive recovery rate of the metal is high; and no waste residue, dust or waste gas is generated, and the method facilitates full realizing of the value of raw materials, and is environmentally friendly. In addition, the method disclosed by the invention has the advantages of high adaptation to the raw materials, easiness in adjustment of the technology, and easiness in control of production process.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, and in particular relates to a smelting method for recovering lead, bismuth and precious metals from acid-making tailings containing lead. Background technique [0002] During the copper pyrometallurgy process, a large amount of smoke and dust are produced, which include volatile substances such as lead, bismuth, zinc, arsenic and fine dust. After bag dust collection, most of the soot is collected and returned to the batching system for re-smelting. The uncollected soot is deposited in the acid production process, forming complex and difficult tailings containing copper, lead, zinc, arsenic, silver and other elements. material. More than 85% of the tailings are composed of lead sulfate, followed by bismuth, a small amount of selenium and valuable metals such as copper and zinc. [0003] Conventional treatment methods for lead-containing tailings in copper smelting systems in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B5/10C22B9/02C22B13/02C22B30/06C22B11/02
CPCY02P10/20
Inventor 马永峰张妮李娟张鹏周志鸿邓民晖孙渊君王有和陈玉平王乃弘苏俊敏
Owner JINCHUAN GROUP LIMITED
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