Graduate qualifying work Theme: Selection and calculating of zinc sulfate production technology

The concentration of zinc sulfate is directly proportional to the amount of weak zinc hydroxide sulfuric acid. Cementitious sediment is identified. A 3 gram-mol zinc sulfate compound is detected.

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  The concentration of zinc sulfate is directly proportional to the amount of weak zinc hydroxide sulfuric acid. Cementitious sediment is identified. A 3 gram-mol zinc sulfate compound is detected.
  
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  ZnSO4·3Zn(OH)2+4H2O
  
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  The solution undergoes the following chemical reaction during the cementation process.
  
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  Me SO4+2Zno+H2O=MeO+H2+ZnSO4+Zn(OH)2
  
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  View of potential energies between electrodes:
  
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  Zn+2H2O=Zn(OH)2+2H+2e Eo=-0,439v
  
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  2Sb+3H2O=Sb2O3+6H++6e E0=+0,152v
  
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  Cu+H2O=CuO+2H+2e E0=+0,57v
  

Description of the technological process.

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  Preparation of solutions and dehydration.
  
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  Technical zinc sulfate is produced by evaporating a solution of zinc sulfate in a fluidized bed furnace (BL).
  
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  The solution after cementitious purifications from cadmium in the cadmium production is fed to the filter press for filtering. The filtered solution is sent to a filler with a capacity of 70 m3. From the collection container, the gravity solution is periodically poured periodically as necessary into a 20 m3 supply tank. The tank is equipped with a level gauge for measuring the amount of solution. From the supply tank, the olution is pumped to the nozzles and sprayed into the furnace.
  

containers or paper bags for.

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  containers or paper bags for.
  
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  Start of the BL furnace.
  
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  The start of the furnace begins with checking the technical condition of the furnace, the presence of the initial solution, testing all the mechanisms in operation.
  
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  The sequence of operations for starting the furnace:
  
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  - the furnace is sealed;
  
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  - the smoke exhauster is included in the operation and a vacuum is created in the furnace 5-8 mm water column;
  
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  - the supercharger is put into operation according to the instructions;
  
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  - a gas burner is ignited while supplying primary air. Ignition of a gas burner is carried out in accordance with the operating instructions for the furnace of the furnace to "BL".
  
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  - the furnace is heated to a temperature of 600-6500 C;
  
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  - secondary air is supplied to create blast elasticity under the hearth, while the air flow is brought up to 6000-9000 m3 / h;
  
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  - the temperature under the hearth rises to 780-8000 C;
  
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  - a layer is loaded, granular zinc sulfate with a granule size of 3-4 mm in an amount of 2-3 tons is used as a material;
  
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  - air consumption increases until the blast elasticity is established under the hearth 800-900 mm and amounts to 10000-12500 m3 / h;
  
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  -the temperature in the layer rises to 190-2600 C;
  
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  - the pump for supplying the solution to the nozzles starts up.