Patent ID: 11884632
Assignee: ZHEJIANG HENGYI PETROCHEMICAL RESEARCH INSTITUTE CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 12:
13. The method of claim 8, wherein the alkaline buffer solution of a nitrogen-containing compound comprises an ammonium salt and an alkali, the ammonium salt is contained in an amount of 0.1-20 wt %, the alkali is contained in an amount of 5-30 wt %, and the alkaline buffer solution of a nitrogen-containing compound has a pH within a range of 8.5-13.5; and/or
the alkaline buffer solution of a nitrogen-containing compound is used in an amount of 500-1,500 parts by weight relative to 100 parts by weight of the roasted product on a dry basis.