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Study on Preparation of Architectural Decorative Materials from Anshan-type Iron Ore Tailings

Author: LiYaChao
Tutor: DengHongChao
School: Jilin University
Course: Mechanical Design and Theory
Keywords: Anshan -type iron tailings Sintering mechanism Hot pressing sintering Decorative building materials
CLC: TD926.4
Type: Master's thesis
Year: 2011
Downloads: 104
Quote: 0
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Abstract


Iron tailings as iron ore beneficiation abandoned solid waste, due to the long-term accumulation of plus and few effective use of large stockpiles of, not only on the environment caused great harm, and take up a lot of mountains The tailings dam accident and arable land, coupled with frequent been reported the harm of its mine people's lives and property safety. Therefore, the purpose of studying how to take advantage of the large demand for high value-added products in the production life of the the iron tailings powder manufacturing in order to achieve effective utilization of iron ore tailings powder more and more attention of the government and researchers. The main purpose is to study the the iron tailings powder as raw material to manufacture decorative building materials technology, which used as a theoretical preparation for the iron ore tailings resource. Thesis study, the Anshan iron tailings powder as main raw material, by adding sintering additives preparation of iron ore tailings sintering decorative building materials. First studied the the iron tailings mineral composition and chemical composition, choice of additives, raw materials and iron ore tailings and sintering aids constitute burnability and sintering mechanism was discussed. Based on this study the hot pressing sintering and pressureless sintering two preparation method of iron tailings decorative building materials, and sintered materials obtained were compared with the performance of natural stone such as marble and granite. Research work are as follows: (1) Anshan iron tailings containing main minerals such as quartz, calcite, chlorite and amphibole, the main chemical ingredient contained in these minerals SiO2, Al2O3, Fe2O3, MgO, FeO . The study of the chemical reaction in the sintering process, the sintering of the driving force and the sintering mechanism. By sintering experiments to explore the role of the component of the raw materials to add a sintering aid and adjustment. Sintering and hot pressing sintering characteristics of two sintering method is analyzed theoretically, and investigate the feasibility of using these two methods of preparation of iron ore tailings the whitewash surface material. (2) study prepared iron tailings finishes with hot pressing sintering materials. A mixture consisting of the test materials by a certain percentage for the the iron tailings powder and sintering aids. By orthogonal test conducted on the experimental conditions and the content of the sintering aid and effect. The hot sintering experiments in accordance with the design of the orthogonal table, and samples of a number of chemical and physical properties were measured. Which the performance of the best hot pressing sintering materials: compressive strength-106MPa, tensile strength-6MPa, flexural strength-23MPa absorbent -0, acid resistance -0 alkali resistance -0.10. (3) in the basis the sintering mechanism study of the powder particles of raw materials and hot pressing sintering experiments to study the mixed powder to the iron tailings powder and glass powder as raw material pressure sintering decorative building materials ratio of raw materials and sintering regime. Thermal analysis, differential thermal analysis (DTA) and thermogravimetric analysis (TGA) carried out on experimental material understanding of the raw materials in the sintering process of the endothermic, exothermic and weight variation, in order to determine the sintering temperature of the sample and heating rate. And by scanning electron microscopy and X-ray diffraction techniques to verify the structure of the microscopic image of the sample and the crystal phases. Concluded by theoretical and experimental: Anshan-type iron tailings composition of the powder is in line with the requirements of the sintered material components, add a small amount of sintering aids in iron tailings better sintering materials; iron tailings powder the best preparation conditions for the preparation of hot pressing sintering materials: the ratio of raw materials (iron ore tailings powder -50% Al2O3-5% of MgO-11% of CaO-15% of Na2CO3-7% of K2CO3-2% B2O3 -4%, S-1%), the sintering temperature of -950 ° C, pressure-15MPa, the holding time of -45 minutes; found by pressureless sintering the physical properties of the sample tested under the same preparation conditions, the glass powder in the raw material The proportion of the mass percentage of 22% when the sintered better than the performance of the finish material, when the sintering temperature is about 1130 ° C.

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CLC: > Industrial Technology > Mining Engineering > Beneficiation > Beneficiation processes and methods > Processing after the election > Tailings disposal and comprehensive utilization
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