PURPOSE: To heighten ability to adsorb metal ions, etc., by forming a continuous porous body having relatively large holes and comprising a zeolite-type clay powder and ettringite crystal coagulatively bonding the particles of the clay powder.

CONSTITUTION: After electric charge of a zeolite-type clay powder is neutralized and removed, the powder is mixed with magnetite, cement, potassium chloride, magnesium chloride, sodium chloride, calcium chloride, sodium sulfate, citric acid, cobalt chloride, and water. After dried, the resulting mixture is magnetized to form a magnetic magnetite-contg. continuous porous body for adsorption where the porous body is comprised of a zeolite-type clay powder and an ettringite crystal coagulatively bonding the clay powder and the continuous pores are comprised of relatively large holes and pores linking the holes.