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Introduction

In the face of heightened carbon footprint awareness and rising energy and raw material costs today, more efficient use of advanced thermal insulation materials is pertinent in energy-intensive industries such as iron and steel. Microporous possesses the lowest thermal conductivity among all other types of insulating materials, even below that of still air. As such, it is used when extreme insulating properties are required in the narrowest of spaces.

Background

Trials were conducted at a cluster market at Jalna, India, where Thermo Mechanically Treated (TMT) bars were manufactured from metal scrap. Metal scrap along with sponge iron were melted in induction furnaces - 15 to 55 tons in capacity.

The metal is melted at 1640 - 1655°C (2984 - 3011°F), depending on the usual practice of each plant. At the trial project sites, the hot face lining is made of a silica ramming mass followed by 70% alumina safety brick and a ceramic fibre board.

Customer Needs

By partnering with Morgan on the design and installation of an optimum insulation lining, the customer aims to:

  • Minimise power consumption in maintaining melt temperature during ladle travelling, holding and casting
  • Have a high level of corrosion resistance to liquid steel at the front of the unit
  • Achieve high energy efficiency and durability; outer shell of steel ladles has to withstand up to 400°C (752°F) over a prolonged period without deforming
  • Maintain intermediate temperature within the continuous use temperature

Proposed Solution

First, an assessment was conducted on the health condition of existing ladles. Based on experience, high quality refractory materials can be insulated with WDS® Microporous solution without compromising durability. In the Solutions and Results table below, the performance of the proposed lining is compared with that of the traditional lining originally used by the customer. With WDS Microporous, it is possible to reduce the shell temperature to 80 - 100°C (176 - 212°F), with significantly less heat loss.

Solutions and Results