An agent for selective antimony and arsenic removal and tin retaining includes 10-30 wt % of aluminum, 65-85 wt % of calcium, 1-10 wt % of coke powder, and 1-5 wt % of lead powder. According to the content of antimony in lead, the antimony and arsenic removal and tin retaining agent is added to a molten lead which is at a temperature of about 550-650° C. at a certain proportion so as to carry out an antimony and arsenic removal reaction; after the reaction is completed, cooling is carried out, and antimony and arsenic scum is fished out to obtain a molten lead with antimony and arsenic removed; the content of antimony and arsenic is reduced to 0.0005 wt % or less, and the content of tin is substantially unchanged. The production costs for lead alloy preparation are reduced, and no smoke and odor appear in an antimony and arsenic removal reaction process.

Disclosed is a process for the production of a purified soft lead product, including a first distillation step for distilling lead from a molten solder mixture to produce as overhead a first concentrated lead stream and as first bottom product a molten crude tin mixture. The process also includes a soft lead refining step for removing at least one contaminant selected from arsenic, tin and/or antimony from the first concentrated lead stream by treating the stream at a temperature of less than 600° C. with a first base and a first oxidant stronger than air, resulting in the formation of a third supernatant dross containing a metalate compound of the contaminant, followed by separating the third supernatant dross from the purified soft lead stream or product, whereby the third supernatant dross contains at most 1.0% wt of chlorine.

Disclosed is a process for the production of a purified soft lead product, including a first distillation step for distilling lead from a molten solder mixture to produce as overhead a first concentrated lead stream and as first bottom product a molten crude tin mixture. The process also includes a soft lead refining step for removing at least one contaminant selected from arsenic, tin and/or antimony from the first concentrated lead stream by treating the stream at a temperature of less than 600° C. with a first base and a first oxidant stronger than air, resulting in the formation of a third supernatant dross containing a metalate compound of the contaminant, followed by separating the third supernatant dross from the purified soft lead stream or product, whereby the third supernatant dross contains at most 1.0% wt of chlorine.

The invention relates to a method for preparing lead (212) for medical use. This method comprises the production of lead (212) by the decay of radium (224) in a generator comprising a solid medium to which the radium (224) is bound, followed by the extraction of the lead (212) from the generator in the form of an aqueous solution A1, characterised in that the lead (212) contained in the aqueous solution A1 is purified from the radiological and chemical impurities, also contained in said aqueous solution, by a liquid chromatography on a column. The invention also relates to an apparatus specially designed for automated implementation in a closed system of said method. It further relates to lead (212) produced by means of this method and this apparatus. Applications: manufacture of radiopharmaceuticals based on lead (212), useful in nuclear medicine for the treatment of cancers, particularly by a-radioimmunotherapy, or for medical imaging, in both humans and animals.

The invention relates to a method for preparing lead (212) for medical use. This method comprises the production of lead (212) by the decay of radium (224) in a generator comprising a solid medium to which the radium (224) is bound, followed by the extraction of the lead (212) from the generator in the form of an aqueous solution A1, characterised in that the lead (212) contained in the aqueous solution A1 is purified from the radiological and chemical impurities, also contained in said aqueous solution, by a liquid chromatography on a column. The invention also relates to an apparatus specially designed for automated implementation in a closed system of said method. It further relates to lead (212) produced by means of this method and this apparatus. Applications: manufacture of radiopharmaceuticals based on lead (212), useful in nuclear medicine for the treatment of cancers, particularly by a-radioimmunotherapy, or for medical imaging, in both humans and animals.

An agent for selective antimony and arsenic removal and tin retaining includes 10-30 wt % of aluminum, 65-85 wt % of calcium, 1-10 wt % of coke powder, and 1-5 wt % of lead powder. According to the content of antimony in lead, the antimony and arsenic removal and tin retaining agent is added to a molten lead which is at a temperature of about 550-650° C. at a certain proportion so as to carry out an antimony and arsenic removal reaction; after the reaction is completed, cooling is carried out, and antimony and arsenic scum is fished out to obtain a molten lead with antimony and arsenic removed; the content of antimony and arsenic is reduced to 0.0005 wt % or less, and the content of tin is substantially unchanged. The production costs for lead alloy preparation are reduced, and no smoke and odor appear in an antimony and arsenic removal reaction process.

A method for comprehensively processing noble lead provided and utilizes two instances of vacuum distillation to realize an open circuit of arsenic, lead, antimony and bismuth and the high-efficiency enrichment of precious metals of gold and silver, and can obtain elemental arsenic, a lead-bismuth-antimony alloy, a silver alloy and a copper alloy, respectively. The lead-bismuth-antimony alloy, the silver alloy and the copper alloy are processed by oxidation refining, electrorefining and chlorination refining to obtain refined lead, refined antimony, antimony trioxide, electrolytic silver and electrolytic copper, and to realize gold enrichment. The entire process has advantages of high metal direct yield, low energy consumption, short flow chart, simple equipment, etc., and vacuum distillation belongs to a physical process in which the alloy can be separated only by means of the difference in saturated vapor pressure between the metals, without generation of wastewater, waste gas and waste residue.

A method for comprehensively processing noble lead provided and utilizes two instances of vacuum distillation to realize an open circuit of arsenic, lead, antimony and bismuth and the high-efficiency enrichment of precious metals of gold and silver, and can obtain elemental arsenic, a lead-bismuth-antimony alloy, a silver alloy and a copper alloy, respectively. The lead-bismuth-antimony alloy, the silver alloy and the copper alloy are processed by oxidation refining, electrorefining and chlorination refining to obtain refined lead, refined antimony, antimony trioxide, electrolytic silver and electrolytic copper, and to realize gold enrichment. The entire process has advantages of high metal direct yield, low energy consumption, short flow chart, simple equipment, etc., and vacuum distillation belongs to a physical process in which the alloy can be separated only by means of the difference in saturated vapor pressure between the metals, without generation of wastewater, waste gas and waste residue.

A system and method for processing leaded glass are presented, in which glass input is tumbled within the cylinder of a ball mill while it is being exposed to an electrolytic fluid. As the glass input is tumbled, balls within the ball mill pulverize the glass input into pulverized glass input particulate matter thereby exposing lead or other heavy metals contained within the glass input to a surface of the pulverized glass input particulate matter. The exposed lead or other heavy metals are largely dissolved by the electrolytic fluid leaving a mostly lead or heavy metal free pulverized glass input particulate matter. A reagent is applied to the pulverized glass input particulate matter to neutralize any residual lead or heavy metal within the pulverized glass input particulate matter thereby allowing the processed pulverized glass input particulate matter to pass a Toxicity Characteristic Leaching Procedure (TCLP) environmental test.

A system and method for processing leaded glass are presented, in which glass input is tumbled within the cylinder of a ball mill while it is being exposed to an electrolytic fluid. As the glass input is tumbled, balls within the ball mill pulverize the glass input into pulverized glass input particulate matter thereby exposing lead or other heavy metals contained within the glass input to a surface of the pulverized glass input particulate matter. The exposed lead or other heavy metals are largely dissolved by the electrolytic fluid leaving a mostly lead or heavy metal free pulverized glass input particulate matter. A reagent is applied to the pulverized glass input particulate matter to neutralize any residual lead or heavy metal within the pulverized glass input particulate matter thereby allowing the processed pulverized glass input particulate matter to pass a Toxicity Characteristic Leaching Procedure (TCLP) environmental test.