vertical milling machine grinding technology of fly ash
a lot of people think of fly ash is very fine, mills for grinding it? practice has proved that the machine is especially suitable for coarse powder vertical roller mill, and less obvious role of fine ash. Superfine grinding for a long time, its Pozzolanic activity is still low. The root cause of this is because the Pozzolanic activity is low is that low CaO content, with high degree of polymerization (CaO/SIO2 about 0.8-1.2, oligomers under 10%), low soluble content of SIO2 and Al2O3, less powder along the surface bond breaking, O2-, Ca2+, Mg2+ and other activity points less. Ultrafine grinding can promote the dissolution reaction of soluble SIO2 and Al2O3, but for several other important factors of improving slightly on their badge, improvement of the Pozzolanic activity is limited.
currently, with economic of development, people on environmental consciousness of improve, fly ash of recycling again using became social concern of problem, Henan Technology Corporation vigorously development has series mill machine, makes its on fly ash for processing, its fly ash by mill machine fine vertical roller mill Hou, not only can accelerated clinker particles of hydration speed, also can ahead of damage fly ash dense of spherical shell, accelerated fly ash of ash reaction, thus improve cement early strength. Fly ash original ash or rough ash by vertical mill machine high fine powder mill to must fine degrees Hou, made fly ash mixed collection material mixed into concrete Hou, not only can replaced part cement of coal, and electric, and limestone, consumption, reduced concrete of cost, protection environment, and can improve concrete of late strength, improved new mix concrete of work sex, improved concrete of durability, production high performance cement.
fly ash's main chemical composition is SiO2, Al2O3 and Fe2O3, CaO of high calcium fly ash contains more. As early as 1914, Americans have been published Anon "ash volcanic features of research", first revealed oxide in fly ash with ash properties. Due to the large quantities of cement and concrete with fly ash and, therefore, their use has been the focus of study of cement industry in China.
according to related data displayed, fly ash in concrete of using, main produced three species effect: Ash activity effect, that cement hydration produced of Ca (OH2) will inspired fly ash of activity, makes of reaction generated to C-S-H gel glue mainly of glue gel material; form effect, that fly ash of particles form by decided of, dang micro beads content is greater than 50% Shi, liquidity improve, reduced concrete of water, improved concrete of work nature; micro set material effect , Which is less than 45 μ m sieve residue of powders can fill the pores in the concrete, and Ca (OH2) reacts may also fill small pores of the gel, made concrete more compact.
a lot of people think of fly ash is very fine, mills for grinding it? practice has proved that the machine is especially suitable for coarse powder vertical roller mill, and less obvious role of fine ash. Superfine grinding for a long time, its Pozzolanic activity is still low. The root cause of this is because the Pozzolanic activity is low is that low CaO content, with high degree of polymerization (CaO/SIO2 about 0.8-1.2, oligomers under 10%), low soluble content of SIO2 and Al2O3, less powder along the surface bond breaking, O2-, Ca2+, Mg2+ and other activity points less. Ultrafine grinding can promote the dissolution reaction of soluble SIO2 and Al2O3, but for several other important factors of improving slightly on their badge, improvement of the Pozzolanic activity is limited.
currently, with economic of development, people on environmental consciousness of improve, fly ash of recycling again using became social concern of problem, Henan Technology Corporation vigorously development has series mill machine, makes its on fly ash for processing, its fly ash by mill machine fine vertical roller mill Hou, not only can accelerated clinker particles of hydration speed, also can ahead of damage fly ash dense of spherical shell, accelerated fly ash of ash reaction, thus improve cement early strength. Fly ash original ash or rough ash by vertical mill machine high fine powder mill to must fine degrees Hou, made fly ash mixed collection material mixed into concrete Hou, not only can replaced part cement of coal, and electric, and limestone, consumption, reduced concrete of cost, protection environment, and can improve concrete of late strength, improved new mix concrete of work sex, improved concrete of durability, production high performance cement.
fly ash's main chemical composition is SiO2, Al2O3 and Fe2O3, CaO of high calcium fly ash contains more. As early as 1914, Americans have been published Anon "ash volcanic features of research", first revealed oxide in fly ash with ash properties. Due to the large quantities of cement and concrete with fly ash and, therefore, their use has been the focus of study of cement industry in China.
according to related data displayed, fly ash in concrete of using, main produced three species effect: Ash activity effect, that cement hydration produced of Ca (OH2) will inspired fly ash of activity, makes of reaction generated to C-S-H gel glue mainly of glue gel material; form effect, that fly ash of particles form by decided of, dang micro beads content is greater than 50% Shi, liquidity improve, reduced concrete of water, improved concrete of work nature; micro set material effect , Which is less than 45 μ m sieve residue of powders can fill the pores in the concrete, and Ca (OH2) reacts may also fill small pores of the gel, made concrete more compact.