Andrew J Lindgren

Title: The Innovative Contributions of Andrew J Lindgren

Introduction

Andrew J Lindgren is a notable inventor based in Grand Rapids, MN (US). He has made significant contributions to the field of metallurgy, particularly in the production of metallic iron nuggets. With a total of seven patents to his name, Lindgren's work showcases his expertise and innovative spirit.

Latest Patents

Lindgren's latest patents include a method and system for producing metallic iron nuggets. This method involves providing a reducible mixture of reducing material, such as carbonaceous material, and reducible iron-bearing material, like iron oxide. The mixture is arranged in discrete portions on a hearth material layer, which may include a coarse overlayer of carbonaceous material. By heating the reducible mixture to temperatures of 1425°C, 1400°C, or 1375°C, the process results in the formation of metallic iron nuggets with a sulfur content of less than 0.03%. Additionally, the slag produced has less than 5% mass MgO, with a specific ratio of sulfur content between the slag and the metallic nuggets.

Another patent by Lindgren also focuses on the production of metallic iron nuggets. This method includes providing a reducible mixture on a hearth material layer, with channel openings extending through the layer to define nugget-forming regions. These openings may be filled with nugget separation fill material, such as carbonaceous material. The thermal treatment of this layer leads to the formation of metallic iron nuggets, showcasing the versatility and effectiveness of his innovative methods.

Career Highlights

Throughout his career, Lindgren has worked with various companies, including Nu-Iron Technology, LLC. His experience in the industry has allowed him to refine his techniques and contribute to advancements in iron production.

Collaborations

Lindgren has collaborated with notable individuals such as Iwao Iwasaki and Richard F Kiesel. These partnerships have likely enriched his work and led to further innovations in his field.

Conclusion

Andrew J Lindgren's contributions to the field of metallurgy through his innovative patents and collaborations highlight his role as a significant inventor. His work continues to influence the production of metallic iron nuggets, showcasing the importance of innovation in industrial processes.