Chromite placers in Hokkaidô and Karafuto

Managing in situ gold concentrations in placers

In studying of the in situ gravitational concentration process part feature for placer, the technological ability to transform the in situ massif placer structure is evident. The two main processes involved in altering the massif in situ have been examined and outlined in detail. The in situ disintegration of massif material results in a new massif gravitational stratification structure. Regula...

Chromite chemistry in SNC meteorites

Optimal End-Case Partitioners and Placers for Standard-Cell Layout

We develop new optimal partitioning and placement codes for end-case processing in top-down standard-cell placement. Such codes are based on either enumeration or branch-and-bound, and are invoked for instances below prescribed size thresholds (e.g., < 30 cells for partitioning, or < 10 cells for placement). Our optimal partitioners handle tight balance constraints and uneven cell sizes transpa...

Pneumoconiosis in chromite miners in South Africa.

SOLID STATE REDUCTION OF CHROMITE IN HIGH CARBON FERROCHROMIUM-CHROMITE COMPOSITE PELLETS

Abstract: In this paper solid state reduction of high carbon ferrochromium-chromite composite pellets in the temperature range of 900-1350°C was investigated. A two stage reduction mechanism is proposed. The first stage is likely to be controlled by the chemical reaction with activation energy of 127.2kJ/mol. In the second stage, solid state diffusion of carbon through the reaction product ...