Patent · US Active

Process and apparatus for roasting of metal sulfide concentrates and/or residues

US11649523B2 · kind B2 · utility

0Cited by

2References

11Claims

0Family size

Assignee

Metso Outotec Finland Oy · FI

Inventors

Jochen Güntner · Alzenau, DE
Alexandros CHARITOS · Frankfurt am Main, DE
Jörg Hammerschmidt · Rückingen, DE

Key dates

Filing date	Jun 2, 2017
Grant date	May 16, 2023
Priority date	—
Expiry date	May 4, 2039

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process for roasting of metal concentrate wherein concentrate particles are fed into a roaster where they are thermally treated at a temperature in the range of 500 and 1200° C. in a fluidized bed to form a calcine. At least parts of the calcine are withdrawn from the roaster together with a gas stream as a solid fraction. Concentrate particles with a diameter at least 50% smaller than the average diameter of the concentrate particles are separated as small particles and/or particles from the gas-solid-fraction are separated in at least one step as small calcine particles and/or particles are gained in another hydrometallurgical step as other particles. Defined particles are pelletized, whereby at least 80% of the pellets feature a diameter of at least 80% of the concentrate particles average diameter. The pellets are fed into the roaster.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.