【China Molybdenum Industry News Network】
Important advantages of the use of sodium hydroxide as compared with sodium carbonate are as follows: First, NaOH has a larger proportion of available sodium. Second, it has a lower melting point and is chemically more active. Third, it is easier to decompose by magnesium chloride prior to the calcium chloride treatment; this is of considerable practical importance because any carbon dioxide entering the finally purified sodium molybdate solution will cause dilution of the product by calcium carbonate.
I claim: 1. Process for extracting molybdenum from wulfenite ore which comprises comminuting and roasting the ore; mixing said roasted ore with a sodium compound selected from the group consisting of sodium nitrate and sodium hydroxide, said sodium compound being present in sufficient proportion to combine with substantially all of the molybdenum contained in the ore to form a water soluble compound of molybdenum;.
Heating said mixture to an elevated reaction temperature; leaching the resultant mass with water to dissolve sodium molybdate therefrom; filtering off the clear impure solution of sodium molybdate; neutralizing said solution; adding thereto a quantity of magnesium chloride, sufficient to precipitate magnesium phosphate and arsenate; filtering off the purified sodium molybdate solution; and precipitating a substantially pure molybdate compound by adding to the solution a quantity of a water-soluble chloride of a metal which forms an insoluble molybdate, sufficient to precipitate substantially all of the molybdenum contained in said solution.
Molybdenum Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
