The invention relates to a technical method for recycling
potassium,
sodium and
zinc from
blast furnace bag ash. The
raw material of the method is the
blast furnace bag ash, and the method aims to realize recycling of
potassium,
sodium and
zinc and cyclic utilization of iron-containing
slag in a steel
plant. The method comprises the process of recycling
potassium and
sodium through
water washing,the process of reducing and volatilizing
zinc and the process of recycling zinc through a wet method. The method specifically includes the steps that after the
blast furnace bag ash is subjected to
water washing, a filtrate containing potassium
chloride and sodium
chloride is obtained, and the filtrate saturated with potassium
chloride or sodium chloride is purified and subjected to fractional
crystallization to obtain KCl and NaCl products; the filtrate not saturated with potassium chloride or sodium chloride is subjected to the
water washing step again, after the water washing residues are dried, the water washing residues, a reduction agent and an
adhesive are evenly mixed and granulated according to a certain
mass ratio, then high-temperature reduction and volatilization of zinc are carried out in a reduction device, and the iron-containing
slag is recycled in the steel
plant; and zinc-rich dust recycled in a
flue gas recycling
system is leached, purified and electrolytically deposited to obtain
metal zinc products, and
electrolyte is recycled in the leaching step. According to the process flow, high-value utilization of the blast furnace bag ash and cyclic utilization of the blast furnace bag ash in the steel
plant are simultaneously realized, and
energy conservation and emission reduction of steel enterprises are promoted.