公开(公告)号：US20240301530A1

公开(公告)日：2024-09-12

申请号：US18647591

申请日：2024-04-26

Applicant: MM Metals USA, LLC

Inventor： Daniel SHAW ,  James SAVILLE ,  John WILLIAMS ,  Trevor N. MUSTOE

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

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

Abstract: A method and system for recovering a high yield of low carbon ferroalloy, e.g., low carbon ferrochrome, from chromite and low carbon ferrochrome produced by the method. A stoichiometric mixture of feed materials including scrap aluminum granules, lime, silica sand, and chromite ore are provided into a plasma arc furnace. The scrap aluminum granules are produced from used aluminum beverage containers. The feed materials are heated, whereupon the aluminum in the aluminum granules produces an exothermic reaction reducing the chromium oxide and iron oxide in the chromite to produce molten low carbon ferrochrome with molten slag floating thereon. The molten low carbon ferrochrome is extracted, solidified and granulated into granules of low carbon ferrochrome. The molten slag is extracted, solidified and granulated into granules of slag.

公开(公告)号：US20220064756A1

公开(公告)日：2022-03-03

申请号：US17523087

申请日：2021-11-10

Applicant: MM Metals USA, LLC

Inventor： Daniel SHAW ,  James SAVILLE ,  John WILLIAMS ,  Trevor N. MUSTOE

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

Abstract: A method and system for recovering a high yield of low carbon ferroalloy, e.g., low carbon ferrochrome, from chromite and low carbon ferrochrome produced by the method. A stoichiometric mixture of feed materials including scrap aluminum granules, lime, silica sand, and chromite ore are provided into a plasma arc furnace. The scrap aluminum granules are produced from used aluminum beverage containers. The feed materials are heated, whereupon the aluminum in the aluminum granules produces an exothermic reaction reducing the chromium oxide and iron oxide in the chromite to produce molten low carbon ferrochrome with molten slag floating thereon. The molten low carbon ferrochrome is extracted, solidified and granulated into granules of low carbon ferrochrome. The molten slag is extracted, solidified and granulated into granules of slag.