Smelting and separating method of noble lead

A separation method and precious lead technology, which is applied in the field of precious lead smelting and separation, can solve the problems of sulfur waste gas and waste water polluting the environment, difficulties in comprehensive recovery, etc., and achieve the goals of increasing direct yield, improving the production environment, and shortening the oxidation blowing time Effect

Inactive Publication Date: 2011-05-18
SIHUI CITY HONGMING PRECIOUS METALS +1
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Problems solved by technology

[0005] The fire-wet combined process method is relatively advanced. The oxidation slag produced by silver separation is treated by wet method, and copper, bismuth, etc. are leached. The yield of silver and other precious metals is significantly improved. The silver recovery rate can reach more than 95wt%, but it cannot avoid The disadvantages of wet method, comprehensive recovery is difficult, nitrogen and sulfur waste gas and waste water are still the main problems of polluting the environment

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  • Smelting and separating method of noble lead

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Smelting of copper anode slime

[0016] (1) The composition of copper anode slime is about: 0.5-1wt% gold, 10-15wt% silver, 10wt% copper, 20-25wt% lead, 15-20wt% antimony, 5wt% bismuth, and <5wt% silicon dioxide , selenium<0.3wt%, tellurium 0.5wt%, water 15wt%. During smelting, 8-15wt% of sodium carbonate, 3-5wt% of fluorite powder, 6-10wt% of pulverized coal, and 2-4wt% of iron filings are added to the total weight of the copper anode slime.

[0017] (2) Put evenly proportioned copper anode slime into the smelting furnace, reduce and smelt at 1000-1200°C to form precious lead rich in gold and silver, and reduction slag and soot A mainly containing silicon dioxide, lead and antimony. The main components of noble lead are: gold 0.8-1.6wt%, silver 15-25wt%, lead 35wt%, antimony 10-20wt%, copper 18wt%, bismuth 8wt%, tellurium 0.8wt%, reduction slag and soot A The lead and antimony smelting system recovers lead and antimony.

[0018] (3) Add the noble lead produced in st...

Embodiment 2

[0026] Embodiment 2, the smelting of lead anode slime

[0027] (1) The composition of lead anode slime is about: gold 0.05wt%, silver 5-10wt%, copper 3-5wt%, lead 20-25wt%, antimony 10-30wt%, bismuth 5-10wt%, tellurium 0.1-0.5 wt%, silicon dioxide <5wt%, water 20wt%. During smelting, 3-5wt% of sodium carbonate and 2-3wt% of pulverized coal are added to the total weight of the lead anode slime.

[0028] (2) Add uniformly proportioned lead anode slime into the smelting furnace, reduce and smelt at 1000-1150°C, and produce noble lead. The main components are: gold 0.1wt%, silver 10-20wt%, copper 5-10wt% %, lead 30-40wt%, antimony 20-40wt%, bismuth 10-20wt%, tellurium 0.2-1wt%, and also produce reduction slag and soot A mainly lead-antimony and silicon dioxide.

[0029] (3) Add the precious lead produced in step (2) into the converter, and moderately oxidize and blow at 700-900°C to remove the antimony-lead until the silver-copper-bismuth alloy containing gold, silver, copper, b...

Embodiment 3

[0037] Embodiment 3: the smelting of noble lead

[0038] (1) The total processing of precious lead raw materials is 15 tons, and its composition is approximately: silver 5wt%, copper 9wt%, lead 53wt%, antimony 18wt%, bismuth 14.5wt%, gold 0.2wt%. Add noble lead into the converter, oxidize and blow antimony lead at 700-1000°C to produce silver-copper-bismuth alloy with the sum of lead and antimony content less than 5%, gold, silver, copper and bismuth are basically enriched in silver-copper-bismuth alloy Antimony enters oxide slag and soot B.

[0039](2) the silver-copper-bismuth alloy produced by step (1) is dissolved with nitric acid, wherein the silver-copper-bismuth dissolves into the solution substantially, and the solution is filtered to obtain filtrate A and filter residue A, and filtrate A adds 25g / L sodium chloride solution to precipitate Silver, filtered to obtain filtrate B and silver chloride, the silver chloride is washed and purified with boiling dilute acid wate...

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Abstract

The invention discloses a smelting and separating method of noble lead, comprising the following steps of: oxidizing and converting the noble lead till a silver-copper-bismuth alloy with the total content of lead and stibium, lower than 5 percent by weight, smoke dust B and oxidized slag are generated; dissolving the silver-copper-bismuth alloy with a nitric acid, and filtering to obtain filter liquor A and filter residues A; separating the silver by chloridizing the filter liquor A, and filtering to obtain filter liquor B and silver chloride; purifying the silver chloride to reduce the silver; displacing tellurium contained in the filter liquor B, then depositing bismuth and copper step by step, and recovering the bismuth and the copper; separating gold from the filter liquor A with an aqueous solution chlorination method, and reducing a solution to obtain gold powder; recovering platinum and palladium from the gold-separated solution, and returning gold-separated chlorination slag to an anode mud smelting process; and recovering the lead and the stibium from the oxidizing slag and the smoke dust B. In the invention, the silver-copper-bismuth alloy with the total content of the lead and the stibium lower than 5 percent by weight is produced through oxidization and converting, and the lead and the stibium enter the oxidized slag and the smoke dust B, therefore, not only are the conditions for the recovery of the lead and the stibium created, but also the valuable metal is basically concentrated in the silver-copper-bismuth alloy by reducing the valuable metal entering the smoke dust B and the oxidized slag; in addition, various metals are extracted from the silver-copper-bismuth alloy step by step by using a wet method, the direct recovery rate of the silver and the gold is higher than 99 percent, the direct recovery rate of selenium and the tellurium is higher than 80 percent, and the direct recovery rate of the platinum and the palladium is higher than 95 percent.

Description

Technical field: [0001] The invention relates to a precious metal smelting technology, in particular to a noble lead smelting and separation method. Background technique: [0002] There are currently three methods of silver smelting: fire method, wet method, and fire-wet combined process. Pyro-smelting is a relatively traditional method. Generally, crude silver is produced by pyro-smelting, and the oxidized slag is returned to the lead system for recycling. Hydrometallurgy uses acidification to dissolve various metals into the solution, and then separates silver and other metals. The fire-wet combined process method is also divided into two categories. One is that the fire method produces coarse silver and oxide slag, and the wet method is used to separate silver and other metals from the oxide slag. The other is to leaching copper, antimony, and bismuth by wet pretreatment first, then separating copper, antimony, and bismuth from the leaching solution, and leaching the sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/02C22B11/00C22B15/00C22B30/06C22B30/02
CPCY02P10/20
Inventor 江继明江启明黄明
Owner SIHUI CITY HONGMING PRECIOUS METALS
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