Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method of preparing siliceous and calcareous porous ceramsite and sulphuric acid by decomposing phosphogypsum
The invention discloses a method of preparing siliceous and calcareous porous ceramsite and sulphuric acid by decomposing phosphogypsum. The method includes the steps of taking 60 to 90 wt% of phosphogypsum and 10-40 wt% of carbonized rice husk as raw materials, and uniformly mixing to obtain mixed fine powder; uniformly mixing 100 parts by mass of mixed fine powder, 0.2 to 1.0 part by mass of water reducing admixture and 40 to 60 parts by mass of water to obtain pug; adding foaming agents and binding agents into the pug, and uniformly stirring to produce foam mud; adding 50 to 200 parts by mass of mixed fine powder into a sugar coating machine, then adding the foam mud, and performing wet granulation to obtain porous precast ceramsite; baking, and performing catalytic decomposing reaction in nitrogen atmosphere at the temperature of 800 to 1000 DEG C to obtain siliceous and calcareous porous ceramsite and sulfur dioxide gas; oxidizing and absorbing the sulfur dioxide gas to produce sulphuric acid. The method of preparing siliceous and calcareous porous ceramsite and sulphuric acid by decomposing phosphogypsum is low in cost and energy consumption, high in sulfur conversion rate, and capable of efficiently utilizing reaction tailings to prepare siliceous and calcareous porous ceramsite while producing sulphuric acid. Besides, the prepared siliceous and calcareous porous ceramsite has low volume density and high cylinder compressive strength.
Method of preparing siliceous and calcareous porous ceramsite and sulphuric acid by decomposing phosphogypsum
The invention discloses a method of preparing siliceous and calcareous porous ceramsite and sulphuric acid by decomposing phosphogypsum. The method includes the steps of taking 60 to 90 wt% of phosphogypsum and 10-40 wt% of carbonized rice husk as raw materials, and uniformly mixing to obtain mixed fine powder; uniformly mixing 100 parts by mass of mixed fine powder, 0.2 to 1.0 part by mass of water reducing admixture and 40 to 60 parts by mass of water to obtain pug; adding foaming agents and binding agents into the pug, and uniformly stirring to produce foam mud; adding 50 to 200 parts by mass of mixed fine powder into a sugar coating machine, then adding the foam mud, and performing wet granulation to obtain porous precast ceramsite; baking, and performing catalytic decomposing reaction in nitrogen atmosphere at the temperature of 800 to 1000 DEG C to obtain siliceous and calcareous porous ceramsite and sulfur dioxide gas; oxidizing and absorbing the sulfur dioxide gas to produce sulphuric acid. The method of preparing siliceous and calcareous porous ceramsite and sulphuric acid by decomposing phosphogypsum is low in cost and energy consumption, high in sulfur conversion rate, and capable of efficiently utilizing reaction tailings to prepare siliceous and calcareous porous ceramsite while producing sulphuric acid. Besides, the prepared siliceous and calcareous porous ceramsite has low volume density and high cylinder compressive strength.
Method of preparing siliceous and calcareous porous ceramsite and sulphuric acid by decomposing phosphogypsum
27.01.2016
Patent
Elektronische Ressource
Englisch
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