Quarry machine for sale in cement factory - 1 views

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  #1 betsy stone on 21 Jul 14

   

  Various substances have been described for use as active substance such as: higher molecular fatty acids i.e., acids with more than 8 carbon atoms and their salts; resinic acids and their salts; naphthenic acids and their salts; waxes; sulphonated vegetal or animal oils;quarry equipment lipoids like cholesterol, lecithin etc.; isocyanates with a long carbon chain; long chain amines and their derivatives; long chain quaternary ammonium salts; and long carbon chain products of the following types: betains, sulphonium and phosphonium salts; phthalic acid and its derivatives; substituted thioureas; metallic dialkyldithiocarbamates; rubber vulcanisation accelerators: substituted polysiloxanes; polymerizable alkylated methylolmelamines.
  
  Active substances of another type include compounds containing a hydrocarbon radical associated with a substituent capable of reacting with mobile hydrogen atoms especially those belonging to hydroxyl groups which may exist on the pigment surface or may have been created thereon by suitable means. Among these substances are: acid anhydrides, acylchlorides,cement plant aliphatic and aromatic isocyanates, organosubstituted chlorosilanes and organosubstituted alkox-ysilanes.In fact while it is relatively easy to select a suitable active substance it is quite difi'icult to obtain an even coating thereof on the surface of the pigment particles.
  
  Processes have been suggested by which the pigment is dispersed in an organic solvent containing the active substance" in solution. After this treatment the solvent is removed by evaporation and the pigment is disintegrated by mechanical means. These prior art processes are expensive due to the unavoidable solvent losses. Furthermore the treatment of large amounts of pigments by such processes involve serious health and fire hazards. In the case of titanium dioxide pigment, there often develops a yellow discoloration during the solvent evaporation which, as in the case of toluene, requires temperatures as high as 120 C. for complete elimination of the solvent. Moreover this type of process meets with an unavoidable inherent difiiculty. The pigment to be treated is organophobic and therefore repellent to the solvent in which it is not adequately dispersed. Numerous pigment particles remain in an agglomerated state and consequently are not fully coated by the active substance, this results in an incomplete treatment i.e., an heterogeneous product. It has therefore been suggested to perform this type of treatment in grinding mills in the presence of organic solvents, which is, of course, an expensive operation.

   

  <div class="cArrow"> </div><div class="cContentInner">Various substances have been described for use as active substance such as: higher molecular fatty acids i.e., acids with more than 8 carbon atoms and their salts; resinic acids and their salts; naphthenic acids and their salts; waxes; sulphonated vegetal or animal oils;<a href="http://www.lightcrusher.com/solutions/quarry-equipment.html" rel="nofollow">quarry equipment</a> lipoids like cholesterol, lecithin etc.; isocyanates with a long carbon chain; long chain amines and their derivatives; long chain quaternary ammonium salts; and long carbon chain products of the following types: betains, sulphonium and phosphonium salts; phthalic acid and its derivatives; substituted thioureas; metallic dialkyldithiocarbamates; rubber vulcanisation accelerators: substituted polysiloxanes; polymerizable alkylated methylolmelamines. <br /> <br /> Active substances of another type include compounds containing a hydrocarbon radical associated with a substituent capable of reacting with mobile hydrogen atoms especially those belonging to hydroxyl groups which may exist on the pigment surface or may have been created thereon by suitable means. Among these substances are: acid anhydrides, acylchlorides,<a href="http://www.lightcrusher.com/solutions/cement-plant.html" rel="nofollow">cement plant</a> aliphatic and aromatic isocyanates, organosubstituted chlorosilanes and organosubstituted alkox-ysilanes.In fact while it is relatively easy to select a suitable active substance it is quite difi'icult to obtain an even coating thereof on the surface of the pigment particles. <br /> <br /> Processes have been suggested by which the pigment is dispersed in an organic solvent containing the active substance" in solution. After this treatment the solvent is removed by evaporation and the pigment is disintegrated by mechanical means. These prior art processes are expensive due to the unavoidable solvent losses. Furthermore the treatment of large amounts of pigments by such processes involve serious health and fire hazards. In the case of titanium dioxide pigment, there often develops a yellow discoloration during the solvent evaporation which, as in the case of toluene, requires temperatures as high as 120 C. for complete elimination of the solvent. Moreover this type of process meets with an unavoidable inherent difiiculty. The pigment to be treated is organophobic and therefore repellent to the solvent in which it is not adequately dispersed. Numerous pigment particles remain in an agglomerated state and consequently are not fully coated by the active substance, this results in an incomplete treatment i.e., an heterogeneous product. It has therefore been suggested to perform this type of treatment in grinding mills in the presence of organic solvents, which is, of course, an expensive operation.</div>

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