David John Evans

Title: David John Evans: Innovator in Lead Sulphide Treatment

Introduction

David John Evans is a notable inventor based in Edmonton, Canada. He has made significant contributions to the field of materials treatment, particularly in the processing of lead sulphide bearing materials. His innovative methods have the potential to enhance the efficiency of lead extraction while minimizing environmental impact.

Latest Patents

David John Evans holds a patent for a method titled "Treatment of lead sulphide bearing material." This patent describes a process for leaching finely divided lead sulphide to convert contained lead values into soluble lead acetate. The method involves creating a slurry of the material in an aqueous medium with free acetate ions and a pH below 5.1. The slurry is then reacted at temperatures ranging from 60 to 120 degrees Celsius with a free oxygen-bearing gas under a partial pressure of oxygen between 20 to 60 p.s.i. This innovative approach not only converts lead sulphide to soluble lead acetate but also produces insoluble elemental sulphur.

Career Highlights

David John Evans is associated with Sherritt Gordon Mines Limited, where he applies his expertise in materials treatment. His work focuses on developing methods that improve the extraction processes in mining operations. With a patent portfolio that includes one significant patent, he has established himself as a key figure in his field.

Collaborations

One of his notable collaborators is Ian M Masters, with whom he has worked on various projects related to lead sulphide treatment. Their combined efforts have contributed to advancements in the mining industry.

Conclusion

David John Evans is a pioneering inventor whose work in the treatment of lead sulphide bearing materials showcases his commitment to innovation in the mining sector. His patented methods offer promising solutions for more efficient and environmentally friendly lead extraction processes.