The proximal end of the ulna articulates with the trochlea of the humerus. To enable movement at the elbow joint, the ulna has a specialised structure, with bony prominences for muscle attachment. Important landmarks of the proximal ulna are the olecranon, coronoid process, trochlear notch, radial notch and the tuberosity of ulna: 1  Olecranon â A large projection of bone that extends proximally, forming part of trochlear notch. 2  Coronoid process â This ridge of bone projects outwards anteriorly, forming part of the trochlear notch.
Metallurgical coke is produced by the destructive distillation of coal in coke ovens. Prepared. coal is heated in an oxygen-free atmosphere (âcokedâ) until most volatile components in the coal are. removed. The material remaining is a carbon mass called coke. Metallurgical coke is used in iron and steel industry processes (primarily in blast furnaces) to. reduce iron ore to iron. Over 90 percent of the total coke production is dedicated to blast furnace. operations.
The tars obtained when coal is distilled in horizontal retorts for the production of either gas or coke are sufficiently similar to be classed under the head ing of coal tar.In the manufacture of gas, the coal is often mixed with bog head shale, bituminous lignite, etc., the gas being thereby en riched.hese variations from normal tar are due to the fact that many of the products of distillation are removed from the reaction chamber before the coal has reached its final high temperature. Vertical retort tar, therefore, has some of thv characteristics of low-temperature tar (see TARS, LOW-TEMPERATURE).