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Study of the Electrolytic Manganese Residue Cementing Material and Its Application

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Tutor: WangZhi
School: Chongqing University
Course: Building Materials
Keywords: Manganese slag,Sulfate,Composite cementitious materials,Wall materials,Road mate
CLC: TU526
Type: Master's thesis
Year:  2010
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Abstract:
Manganese slag (Electrolytic Manganese Residue, EMR) by manganese (is usually manganese carbonate) with a high sulphate content is produced in the electrolytic production of manganese metal process, the fineness, the moisture content, a heavy metal content of industrial wastes, causing a great deal of pollution on the environment in the vicinity of the manganese enterprises. In recent years, the academics, though its research, but the utilization of its resources has been no major breakthrough. This article intends to take advantage of the characteristics of the high sulfur content of manganese slag as pozzolanic material sulfate activator study. Firstly, from manganese slag building materials resource utilization were conducted a preliminary analysis of its basic nature, focusing on the manganese slag sulfur. On this basis, give full play to the advantage of the sulfate-rich activator for pozzolanic material sulfate, fly ash as pozzolana materials representative study manganese slag pozzolanic activity of fly ash inspire effect of further study manganese slag composite cementitious materials and its application, it is very necessary to provide a reference to its application in building materials. The results show that: ① manganese slag is a SO3 content of up to 18% -28%, the material particle size in the relatively high proportion of particles below 80μm and moisture content of up to 30% -40% of the inert black clay substance, a sulfur existing forms of soluble sulfate dihydrate gypsum morphology can reach more than 25% of the total sulfate content; ② manganese slag pretreatment not only change the the manganese slag viscous state to facilitate its resource use of to obtain alkaline environment, and by pretreatment, curing manganese slag residual Mn2 ion, NH4 release in the course of the adverse impact on the environment while eliminating manganese slag; sulfate ③ manganese slag pulverized coal ash, lime system activation of sulfate, 30% manganese slag by 7% of the pretreatment agent pretreatment best excitation effect of fly ash, lime system; manganese slag composite cementitious system, cement content of the composite the mechanical properties of the cementitious material impact the curing conditions more favorable to the development of composite cementitious material strength constant temperature 60 ° C hot and humid conservation; cementitious material with no toxic effects in a neutral environment and weak acid environment; gelling system hydration products of calcium silicate hydrate gel (CSH), ettringite (AFt); ④ manganese slag composite cementitious materials, can produce excellent performance of manganese slag Pastes and performance meet concrete road with low traffic requirements of the rural road.
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