Chemistry of Phosphoric Acid Manufacture Quiz
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Questions and Answers

What are the principal mineral raw materials for the manufacture of ceramic products?

  • Calcite and dolomite
  • Gypsum and limestone
  • Quartz and feldspar
  • Silica and alumino-silicates (correct)
  • Which minerals are considered objectionable for ceramic products due to iron staining and iron oxide minerals?

  • Quartz (correct)
  • Clays
  • Feldspars
  • Orthoclase
  • What is the chief use of soda feldspar in the ceramic industry?

  • Glazing purposes (correct)
  • Preparing ceramic bodies
  • Fusing at high temperatures
  • Fluxing material in enamels
  • What should the feldspars for use in the ceramic industry contain?

    <p>Minimum of 65-72% SiO2 and not less than 4% Na2O</p> Signup and view all the answers

    Which geological sources are suitable for silica in the ceramic industry?

    <p>Pegmatites and vein quartz</p> Signup and view all the answers

    What is the function of feldspars in the preparation of ceramic bodies and glazes?

    <p>Fluxing material</p> Signup and view all the answers

    What is the primary constituent of both ball clay and china clay?

    <p>Kaolinite</p> Signup and view all the answers

    Which material helps in bonding and cementing the ingredients together in ceramics?

    <p>Feldspar</p> Signup and view all the answers

    What does the term 'ceramics' broadly include, according to the text?

    <p>A variety of materials such as refractories, glasses, and more</p> Signup and view all the answers

    What are ceramics generally characterized by, as per the text?

    <p>High temperature resistance</p> Signup and view all the answers

    Which method of forming clay involves the use of a potter's wheel and is still used today?

    <p>Jiggering process</p> Signup and view all the answers

    Which material contributes to the mechanical strength of ceramics?

    <p>Silica</p> Signup and view all the answers

    What is the meaning of the word 'ceramics', as per its origin?

    <p>'Burnt material'</p> Signup and view all the answers

    Which of the following is NOT a category of ceramic materials produced from silica and alumina?

    <p>Ferroelectrics</p> Signup and view all the answers

    What are pegmatites often zoned into distinct bands of, according to the text?

    <p>Quartz and feldspar</p> Signup and view all the answers

    Which type of clay has greater plasticity and lesser refractoriness due to the presence of montmorillonite?

    <p>Ball clay</p> Signup and view all the answers

    What is the chemical formula for phosphoric acid?

    <p>H3PO4</p> Signup and view all the answers

    Which industry uses thermal process phosphoric acid of higher purity?

    <p>Manufacturing high-grade chemicals</p> Signup and view all the answers

    How is wet process phosphoric acid produced?

    <p>By reacting sulfuric acid with phosphate rock</p> Signup and view all the answers

    How is excess cooling water from wet process phosphoric acid production managed?

    <p>Collected in cooling ponds for subsequent evaporation and recirculation</p> Signup and view all the answers

    What is a potential consequence of leachate seeping from cooling ponds?

    <p>Groundwater contamination</p> Signup and view all the answers

    What is the primary use of thermal process phosphoric acid?

    <p>Manufacture of high-grade chemicals</p> Signup and view all the answers

    What is the primary raw material for the production of phosphoric acid by the wet process?

    <p>Phosphate rock</p> Signup and view all the answers

    Why do some U. S. companies prefer the hemihydrate process over the dihydrate process?

    <p>Due to the higher P2O5 concentration in wet process phosphoric acid</p> Signup and view all the answers

    What does the dihydrate process produce gypsum in the form of?

    <p>Calcium sulfate with 2 molecules of water</p> Signup and view all the answers

    In the wet process for phosphoric acid production, what is used to separate gypsum from the reaction solution?

    <p>Filtration</p> Signup and view all the answers

    What percentage of P2O5 does wet process phosphoric acid normally contain?

    <p>26 to 30%</p> Signup and view all the answers

    What are the raw materials for the production of phosphoric acid by the thermal process?

    <p>Elemental phosphorus, air, and water</p> Signup and view all the answers

    What is formed during the combustion step in the thermal process phosphoric acid manufacture?

    <p>Phosphorus pentoxide</p> Signup and view all the answers

    How is phosphoric acid further concentrated in most cases to meet phosphate feed material specifications for fertilizer production?

    <p>By using vacuum evaporators</p> Signup and view all the answers

    What is used to separate gypsum crystals from the acid during the reaction in the wet process for phosphoric acid production?

    <p>Filtration</p> Signup and view all the answers

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