Effective Utilization Of Coal Fly Ash Containing
Unburned Carbon
Author(s)
M. Miyake, V. Kumar Jha, Y. Kimura & M. Matsuda
Abstract
We investigated the conversion process of coal fly ash with unburned carbon at
greater than ca. 6 mass%, which has fallen behind in terms of resource recovery.
As a result, composite materials consisting of zeolite A and/or zeolite X with
good crystallinity and activated carbon were successfully prepared by NaOH
fusion treatment at 750°C in N2 flow followed by hydrothermal treatment. The
type of zeolite phase formed was dependent on the hydrothermal treatment
conditions including NaOH concentration. The resulting composite materials
exhibited removal characteristics for heavy metal ions such as Ni2+, Cd2+ and
Pb2+. In this paper, we describe the conversion of the main SiO2-Al2O3
components and unburned carbon in coal fly ash into zeolite-activated carbon
composite materials by a chemical process and the removal characteristics of the
resulting materials.
Keywords: coal fly ash, zeolite, fusion treatment, hydrothermal treatment,
removal characteristics.
1 Introduction
Fossil fuels are of great importance because they can be burned, producing
significant amounts of energy. The burning of fossil fuels produces several
billion tones of carbon dioxide per year globally. Therefore, in order to reduce
the air pollution, several countries have put forward their environmental
regulations. Under the regulations, coal-fired power plants will need to reduce
their emissions by more than 50% within the next decade. Due to the strict
regulations on the burning of coal, coal fly ash (CFA) contains variable amounts
Keywords
coal fly ash, zeolite, fusion treatment, hydrothermal treatment,
removal characteristics.
Related Book
Other papers in this volume
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