Papers by Author: Hao Ze Wu

Abstract: Steel slag, a kind ofindustrial residues, is generated in the process of steel-making. Paper sludgeis the final material which origins from the treatment of liquid waste. Allthese resulted in a serious pollution of environment, how to achieve thecoordinate development among enterprise, environment and society become apressing matter of the moment. Based on this, Circular economy becomenecessary. Based on circular economy, the two kinds of industrial wastes weremixed to manufacture useful materials through carbonation in this research. Therequired raw materials were mixed by mortar mixer at the specified mixingratio. Then the mixture was transferred to a stainless steel mould formanufacturing of rectangular composite specimens. Only in this way, It is toshift from the paper maunfacturing and ironmaking and steelmaking industrywhich is over-consumption of energy and natural resources and very seriousenvironmental pollution to the industry which is less pollution and thedevelopment of multi-part cycle.

Abstract: The effects of carbonation on structure and properties of steel slag specimens are evaluated by some different testing technologys in this paper. The experimental results of strength and soundness show that the compressive strength of samples is improved 6-8 times due to carbonation, and carbonated specimens have qualified autoclave soundness. Also the carbonation reactions of steel slag and the reason that why strength and soundness improved are analyzed by chemical titration, XRD, TG, SEM and MIP etc. Experimental results indicate that in steel slag specimens, f-CaO, f-MgO, partial C2S and C3S minerals could be carbonated, and 105～110 gram CO2 gas could be sequestrated after carbonating per kilogram of steel slag specimens.

Abstract: Accelerated carbonation is a new technology of materials preparation, which may have potential for the treatment of industrial solid residues and the sequestration of CO2, an important greenhouse gas. In this study, accelerated carbonation was used to recycle steelmaking slag and sequestrate CO2 to manufacture building materials. The experimental results show that the strength of specimens increases along with the increase of carbonation degree. Moisture content, carbonation temperature and curing time have significant effects on the degree of carbonation, and carbonated specimens have larger weight increase and compressive strength increases under the condition of moisture content 12.6%，reaction time 117 min and reaction temperature 361 K. The SEM and XRD analyses indicate that dogtooth like CaCO3 crystals appear on the surface of carbonated aggregate specimens. Strength and soundness test shows that steelmaking slag building materials have higher strength and eligible soundness after accelerated carbonation.