Extraction of Rhenium and Osmium from Lead Technogenic Raw Materials of Copper Production

Abstract

Lead sludge from copper production is a source of rare metals, such as rhenium and osmium, whose content reaches 0.06–0.08% and 0.0025–0.0050%, respectively. The base of the sludge consists of lead sulfate. A method of reductive smelting of lead sludge from copper smelting production at 1000–1100 °C has been developed. Coke was used as a reducing agent and sodium sulfate as a slag-forming material. Optimal conditions for selective extraction of rare metals in smelting products were found: osmium in the form of metallic form into raw lead and rhenium in the form of perrhenate compound Na5ReO6 into sodium-sulfate slag. The developed technology makes it possible to extract rhenium with a high degree of extraction in the form of water-soluble compounds for the subsequent production of commercial salts of rhenium by the known hydrometallurgical methods. The content of rhenium in the slag phase is 0.18–0.25%, with its initial content in the slime of 0.06–0.08%. The degree of rhenium concentration at the first stage of processing is 3–3.2 times in the form of water-soluble perrhenate. Osmium and lead do not form solid solutions; osmium in crude lead is mainly concentrated in the lower zones of lead. A method of obtaining a concentrate containing 53–67% osmium from raw lead with an initial content of 0.0025–0.0050% in the slurry and a concentration number of 13,000–21,000 times has been proposed.

Sustainable and Selective Modern Methods of Noble Metal Recycling

“… [97] Osmium is also present in the lead sludge obtained from copper production at 50 g t −1 , in addition to 800 g t −1 of rhenium. [98] This can be extracted on the first stage of copper processing providing a promising source of these rare noble metals.…”

Sustainable and Selective Modern Methods of Noble Metal Recycling

“…From OsO 4 to regenerate osmium metal it requires reduction, this had been achieved using biomass derived 10‐undecenoic acid in combination with a polymer support [97] . Osmium is also present in the lead sludge obtained from copper production at 50 g t −1 , in addition to 800 g t −1 of rhenium [98] . This can be extracted on the first stage of copper processing providing a promising source of these rare noble metals.…”

“…[97] Osmium is also present in the lead sludge obtained from copper production at 50 g t À 1 , in addition to 800 g t À 1 of rhenium. [98] This can be extracted on the first stage of copper processing providing a promising source of these rare noble metals.…”

Rice Husk Cellulose-Based Adsorbent to Extract Rare Metals: Preparing and Properties

“…The main method of rhenium extraction from domestic raw materials is conversion into man-made products during the processing of copper and molybdenum ores and concentrates [ 4 , 5 , 6 , 7 ]. Studies on rhenium extraction through the processing of scrap heat-resistant alloys [ 8 , 9 , 10 , 11 ] and spent catalysts [ 12 ] are known.…”