Experimental Study of Stabilized Soil Utilizing Circulating Fluidized Bed Combustion Desulfurization Ash with Carbide Slag and Desulfurization Gypsum

Dezhi Shao,Jinlong Liu,Xin Huang

doi:10.1155/2015/459201

Abstract

This paper discusses the feasibility of preparing soil stabilizer which is circulating fluidized bed combustion ash-based, supplemented with carbide slag and desulfurization gypsum, composed entirely of complete industrial wastes. The results show that CFBC ash has better pozzolanic activity than fly ash. When stabilizer total content is 10% and the ratio of CFBC ash : carbide slag : desulfurization gypsum is 7.2 : 1.8 : 1, compressive strength of stabilized soil can reach the maximum of 2.12 MPa at the age of 28 d of curing. Stabilizer can meet the strength requirements of cement-soil mixing pile composite foundation and cement-soil mixing pile waterproof curtain.

Highlights

With the increasing amount of coal mined and gangue heaped, countries encourage utilizing the combustion of gangue and low calorific value coal to generate power and ban permanent gangue heap
Compared with pulverized fuel fly ash (PFA), Circulating fluidized bed combustion (CFBC) ash is various in chemical compositions, higher water requirement, richer in anhydrite and free lime, which seriously limits the resource utilization [2]
The aim of this work is to discuss the feasibility of preparing soil stabilizer which is CFBC ash-based, supplemented with carbide slag (CS) and flue gas desulfurization gypsum (FGDG), composed of complete industrial wastes

Summary

Introduction

With the increasing amount of coal mined and gangue heaped, countries encourage utilizing the combustion of gangue and low calorific value coal to generate power and ban permanent gangue heap. Circulating fluidized bed combustion (CFBC) is widely used due to the ability of utilizing low calorific value coal, fully combust, and high desulfurization efficiency [1]. Circulating fluidized bed combustion ash (CFBC ash) is the main product of the coal combustion, which increases year by year. The resource utilization of CFBC ash is still in infancy. Large quantity of raw CFBC ash in China is mainly discharged directly to waste dumps [3]. With the rapid development of modern industry, production of industrial wastes increases year by year. Soluble harmful elements contained in industrial wastes may cause groundwater pollution. Problems mentioned above lead to heavy economic and environmental burden to the country [4]

Objectives

Methods

Results