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Separation of Tungsten and Manganese Ore

Chemical flotation is a good way to separate some rougher ore and the harmful impurities are removed  and improving the grade, but also making some useful components to turn harm into good.

magnetic-separator

Magnetic Separator
 

flotation-machine

Flotation Machine
 

rotary-kiln

Rotary Kiln
 

 

 

 Chemical Separation of Rough Tungsten

The impurities in the coarse tungsten concentrate often include tin, arsenic, phosphorus, molybdenum, sulfur and copper.

Tin often exist in the form of cassiterite, if the tin monomers were mixed in the rougher concentrate, intensity magnetic separation or pickling are used to drop tin. If failed, use the chloride evaporation method. According to this case, 10-20% sawdust or carbon powder and 12-28% ammonium chloride or ferric chloride need to add in, then firing 3-4 hours in a reducing atmosphere at 850 ℃, the rate of tin removal can be more than 90%, the process can be conducted in a reverberatory furnace or a rotary kiln. 

Arsenic is mainly in the form of arsenopyrite, realgar, orpiment, arsenic trioxide and various stone arsenate and mixed in tungsten concentrate, the available arsenic removal method can be weak oxidizing roasting or reduction baking method. According to arsenic level, add 2-6% charcoal powder or pulverized coal, roast 2-4 hours in 700-800℃ for arsenic removal.

Phosphorus always remain in tungsten concentrates in the form of apatite, which can be leaching with 3-6% hydrochloric acid, as well as removal of a substantial amount of hunger, arsenic, silicon, copper, molybdenum and other impurities. And part of tungsten is into the infusion, it can be recovered from the leaching solution of byproducts and tungsten, molybdenum, for example, hydrolysis can be used for recycling and recovery of molybdenum, lime neutralization can be used for recycling tungsten. Using soda liquid to leach phosphorus in lime precipitates to get qualified tungsten molybdenum concentrate. If the phosphorus exist in the form of xenotime, monazite and other form or the method of acid leaching faild, flotation can be a good choice. In China, some tungsten plant use floating phosphorus and Tungsten suppression method for phosphorus removal, at the same time to get rare earth concentrates. 
  
 
 Acid leaching method can be used for molybdenum removal in tungsten concentrate, but it can not remove molybdenite. If Molybdenum exist in the presence of molybdenite, Sodium hypochlorite solution molybdenum can be used for leaching of molybdenum, as well as removing a certain amount of copper and arsenic sulfide. Molybdenum concentrates can be get in case the molybdenum content is high in infusion. Some plants in other countries usually use acid leaching, but generally do not recycle tungsten, molybdenum from the infusion.

 Flotation Separation of Rough Manganese Concentrate 

Oxide melting-nitrate leaching or soda sinter-water immersion method can be used for phosphorus removal in case the phosphorus is excessive in manganese ore (phosphorus manganese ratio should be less than 0.005). Roasting-nitric acid leaching is employed to roast Manganese carbonate concentrate in an oxidizing atmosphere of 950-1000 ℃, turning Manganese Carbonate into manganese oxide insoluble in nitric acid (hausmannite Mn3O4), then use 7-1% of nitric acid leaching calcine and make phosphorus  fell to 0.1-0.06%, improving manganese grade significantly. Processing of manganese ore with manganese content greater than 28% can get materials for the production of ferromanganese. Processing of lean manganese ore can get manganese for the production of ferrosilicon.

Soda sintering is carried out at 850-920℃ (Na2O: SiO2=1.5), making phosphate, part quartz and silicate converted to water soluble sodium silicate. Water-soluble impurities can be removed after the flooding of sinters ground, also get high quality silicon oxide. 

  

 

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