Alluvial gold mining increases considerably - 1 views

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  #1 betsy stone on 13 Aug 14

   

  The method of removing sulphur dioxide10 from gases containing the same and free oxygen, which comprises passing said gases through a washer, intimately contacting said gases within said washer with a solution containing as a catalyst not less than 28 milligrams per liter nor more than 280 milligrams per liter of manganese ions to dissolve said sulphur dioxide in said solution,grinding quartz 2500 mesh and removing sulphuric acid from said solution by passing said solution over iron and iron oxides.United States Patent 3,381,388 UPGRADING AND DEWATERING 0F COAL Arun Kumar Chakravarti, Jagadish Chattopadhyay, Gour Gopal Sarkar, and Adiuath Lahiri, all The Central Fuel Research Institute, Jealgora, Bihar, India No Drawing. Filed Nov. 15, 1966, Ser. No. 594,358 9 Claims. (Cl. 34-9) This invention relates to the upgrading and dewatering of coal.
  
  The production of some fine coal is inevitable in course of handling and preparation of coal, and its amount depends on the nature of the coal, the mining methods employed, the mode of coal handling, the degree of crushing and the scheme of preparation. When the raw coal is crushed to smaller sizes prior to washing for better recovery of the cleans,alluvial gold mining equipment the production of fines increases considerably.Various methods have already been proposed for upgrading and dewatering fine coal. One of these methods, known as the Convertol process was developed in Germany for simultaneous upgrading and dewatering of coal slurry. The process consists in dispersing the coal slurry (about 400-600 grams of solid per litre) by mixing with 15-10% of heavy oil in a specially designed mill. The oiled coal slurry is then passed through a centrifugal drier with a perforated basket of 0.2-0.5 mm. aperture, where the coal-oil mixture is retained in the basket and discharged as a concentrate, while the dirt particles pass through the centrifuge as eflluent.
  
  Another method known as the Phase Separation Process, is based on the selective wetting and agglomeration of coal by petroleum fractions and has been applied for cleaning high ash content Indian coals. The agglomeration of Wetted particles is made use of for separating the oil-coal phase from the water-mineral phase by employing size separation techniques.

   

  <div class="cArrow"> </div><div class="cContentInner">The method of removing sulphur dioxide10 from gases containing the same and free oxygen, which comprises passing said gases through a washer, intimately contacting said gases within said washer with a solution containing as a catalyst not less than 28 milligrams per liter nor more than 280 milligrams per liter of manganese ions to dissolve said sulphur dioxide in said solution,<a href="http://www.sellercrusher.com/solutions/grinding-quartz-2500-mesh.html" rel="nofollow">grinding quartz 2500 mesh</a> and removing sulphuric acid from said solution by passing said solution over iron and iron oxides.United States Patent 3,381,388 UPGRADING AND DEWATERING 0F COAL Arun Kumar Chakravarti, Jagadish Chattopadhyay, Gour Gopal Sarkar, and Adiuath Lahiri, all The Central Fuel Research Institute, Jealgora, Bihar, India No Drawing. Filed Nov. 15, 1966, Ser. No. 594,358 9 Claims. (Cl. 34-9) This invention relates to the upgrading and dewatering of coal. <br /> <br /> The production of some fine coal is inevitable in course of handling and preparation of coal, and its amount depends on the nature of the coal, the mining methods employed, the mode of coal handling, the degree of crushing and the scheme of preparation. When the raw coal is crushed to smaller sizes prior to washing for better recovery of the cleans,<a href="http://www.sellercrusher.com/solutions/alluvial-gold-mining-equipment.html" rel="nofollow">alluvial gold mining equipment</a> the production of fines increases considerably.Various methods have already been proposed for upgrading and dewatering fine coal. One of these methods, known as the Convertol process was developed in Germany for simultaneous upgrading and dewatering of coal slurry. The process consists in dispersing the coal slurry (about 400-600 grams of solid per litre) by mixing with 15-10% of heavy oil in a specially designed mill. The oiled coal slurry is then passed through a centrifugal drier with a perforated basket of 0.2-0.5 mm. aperture, where the coal-oil mixture is retained in the basket and discharged as a concentrate, while the dirt particles pass through the centrifuge as eflluent. <br /> <br /> Another method known as the Phase Separation Process, is based on the selective wetting and agglomeration of coal by petroleum fractions and has been applied for cleaning high ash content Indian coals. The agglomeration of Wetted particles is made use of for separating the oil-coal phase from the water-mineral phase by employing size separation techniques.</div>

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