Abstract: The present disclosure belongs to the technical field of drug delivery and biomimetic structures inducing cell proliferation and differentiation, and in particular relates to a micro-nano medical stent for directional, quantitative and timed controlled release of drug and a preparation method thereof. The micro-nano medical stent provided by the present disclosure is composed of an ordered fiber structure electrospun as a skeleton layer and a disordered fiber structure electrospun as an ECM layer that can both load drugs. The micro-nano medical stent can achieve directional, quantitative and timed release of drugs.

Abstract: A combined furnace system for fire refining red impure copper, comprising in order: a shaft furnace (2) for smelting red impure copper raw material into red impure copper liquid; a red impure copper liquid groove (4); at least one rotary furnace (5) for refining and producing refined copper liquid by means of oxidation reduction; a refined copper liquid groove (6). The combined furnace system is characterized in that the system comprises a tilting furnace (3) between the shaft furnace (2) and the red impure copper liquid groove (4) for removing slag from red impure copper liquid having slag. The invention thereby provides a combined furnace system that easily removes slag, has a smooth, unobstructed red impure copper liquid groove, and smelts and refines with stable production efficiency.

Abstract: A combined furnace system for fire refining red impure copper, comprising in order: a shaft furnace (2) for smelting red impure copper raw material into red impure copper liquid; a red impure copper liquid groove (4); at least one rotary furnace (5) for refining and producing refined copper liquid by means of oxidation reduction; a refined copper liquid groove (6). The combined furnace system is characterized in that the system comprises a tilting furnace (3) between the shaft furnace (2) and the red impure copper liquid groove (4) for removing slag from red impure copper liquid having slag. The invention thereby provides a combined furnace system that easily removes slag, has a smooth, unobstructed red impure copper liquid groove, and smelts and refines with stable production efficiency.