公开(公告)号：US20240344171A1

公开(公告)日：2024-10-17

申请号：US18756430

申请日：2024-06-27

申请人： MM Metals USA, LLC

发明人： Daniel Shaw ,  Adriaan Jacobus Van Der Merwe ,  Ottmar Aloys Lange

IPC分类号： C22B5/04 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C21D9/00 ,  C22B1/24 ,  C22C33/04 ,  C22C38/18

CPC分类号： C22B5/04 ,  C21D1/74 ,  C21D6/002 ,  C21D8/1205 ,  C21D9/0025 ,  C21D9/0068 ,  C22B1/24 ,  C22C33/04 ,  C22C38/18

摘要： A method and system for recovering low carbon ferrochrome from feed materials including chromite ore and aluminum granules in a chamber of an arc furnace using an aluminothermic smelting process carried out in the presence of an inert gas, e.g., Argon. The aluminothermic smelting process produces a bath of molten low carbon ferrochrome metal with molten slag floating thereon in the chamber. The molten low carbon ferrochrome metal and molten slag are extracted individually and processed to provide a solidified low carbon ferrochrome metal product and a solidified slag particles product, respectively. A method for the recirculation, recovery and reuse of the inert gas, and a system for accomplishing the recirculation, recovery and reuse of the inert gas.

公开(公告)号：US20230399718A1

公开(公告)日：2023-12-14

申请号：US18229467

申请日：2023-08-02

申请人： MM Metals USA, LLC

发明人： Daniel Shaw ,  Adriaan Jacobus Van Der Merwe ,  Ottmar Aloys Lange

IPC分类号： C22B5/04 ,  C22C33/04 ,  C22C38/18 ,  C22B1/24 ,  C21D9/00 ,  C21D8/12 ,  C21D1/74 ,  C21D6/00

CPC分类号： C22B5/04 ,  C22C33/04 ,  C22C38/18 ,  C22B1/24 ,  C21D9/0025 ,  C21D8/1205 ,  C21D1/74 ,  C21D9/0068 ,  C21D6/002

摘要： A method and system for recovering a high yield of low carbon ferrochrome metal from chromite ore and low carbon ferrochrome metal produced by the method. A thermochemistry calculated mixture of feed materials including aluminum granules, burnt limestone, and chromite ore are provided into a DC plasma arc furnace. The aluminum granules are produced from aluminum scrap. The feed materials are heated upon entering the furnace free board through a feed mix injection system, whereupon the aluminum in the aluminum granules produces an exothermic reaction reducing the chromium oxide and iron oxides in the chromite ore to produce molten low carbon ferrochrome metal with molten slag floating thereon. The molten low carbon ferrochrome metal is extracted, solidified into ingots, crushed into coarse pieces or fines of low carbon ferrochrome metal product. The molten slag is extracted, quenched and solidified into slag particles product.