 Commercial rhenium is extracted from molybdenum roaster @-@ flue gas obtained from copper @-@ sulfide ores . Some molybdenum ores contain 0 @.@ 001 % to 0 @.@ 2 % rhenium . Rhenium ( VII ) oxide and perrhenic acid readily dissolve in water ; they are leached from flue dusts and gasses and extracted by precipitating with potassium or ammonium chloride as the perrhenate salts , and purified by recrystallization . Total world production is between 40 and 50 tons / year ; the main producers are in Chile , the United States , Peru , and Poland . Recycling of used Pt @-@ Re catalyst and special alloys allow the recovery of another 10 tons per year . Prices for the metal rose rapidly in early 2008 , from $ 1000 – $ 2000 per kg in 2003 – 2006 to over $ 10 @,@ 000 in February 2008 . The metal form is prepared by reducing ammonium perrhenate with hydrogen at high temperatures : 
