METHOD OF MODIFYING SORBENT BASED ON METALLURGICAL DROSS Russian patent published in 1996 - IPC

FIELD: production of sorbents for household waste water. SUBSTANCE: dross having grain size 3-5 mm is treated with 4.5-5.5% hydrochloric or nitric acid solution for 1-2 h, washed, treated with 4.5-5.5% alkali solution for 2-40, and washed again until pH 6-8 is achieved. Thereafter, dross is partially dried at 100-150 C for 5-6 h and calcined at 500-600 C for 1-2 h. EFFECT: reduced expenses due to use of low-expensive starting material.