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Catalysts derived from waste slag for transesterification

Journal of Natural Gas Chemistry 2011年第3期20卷 299-302页

作者： Xiaowei Zhang Wei Huang Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province Taiyuan University of＂ TechnologyTaiyuan 030024 Shanxi China Shanxi Institute of Mechanical ＆ Electrical Engineering Changzhi 046011 Shanxi China

MgO-CaO/SiO2 solid catalysts derived from waste slag （WS） of metal magnesium plant were prepared. The catalytic performances were evaluated in the transesterification of rapeseed oil with methanol to biodiesel in a 500 mL three-necked reactor under atmospheric pressure. The basic strengh of the catalyst reached 22.0 measured by indicators accroding to Hammett scale. The results show that the MgO-CaO/SiO2 is an excellent catalyst for transesterification, and the conversion of rapeseed oil reach 98% under the optimum condition.

关键词： waste slag solid catalyst biodiesel transesterification

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Recovery of rare earths and aluminum from FCC waste slag by acid leaching and selective precipitation

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Journal of Rare Earths 2017年第11期35卷 1141-1148页

作者： Jinyu wang Xiaowei Huang Dali Cui Liangshi Wang Zongyu Feng Bin Hu Zhiqi Long Na Zhao National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Beijing 100088 China Grirem Advanced Materials Co. Ltd. Beijing 100088 China

This paper investigated the recovery of rare earth elements(REEs) and aluminum(AI) from the waste slag discharged by FCC catalyst factory(FCC waste slag) via acid leaching and selective *** methods such as ICP-AES, XRF and XRD were applied to obtain experiment data. The maximum leaching efficiency of REEs and Al was achieved at pH value of 1 and with liquid to solid ratio of 4:1,Under such conditions, 91.01%, 92.24% and 94.77% of La, Ce and Al were extracted at 20 ℃ for 2 h from the FCC waste slag, respectively. The SiOcontent in the leaching residue was 88.3%, which can be used as an available silicon resource. The REEs can be precipitated in the form of REEs and sodium double sulfate(NaRE(SO)·xHO) by adding NaSOto the leaching solution, while Al remained in the solution. Afterwards, the pH value of the filtrate was adjusted to 4.5, and Al was precipitated as AI(OH). Finally,NaRE(SO)·xHO and Al(OH)were converted into RECland Al(SO4)solution,respectively, which were recycled to manufacture zeolite. This process recovered REEs and Al from the FCC waste slag and reduced the emissions of waste slag simultaneously, which has an important economic and environment significance.

关键词： Rare earth Aluminum Recovery FCC catalyst waste slag

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THE USE OF waste slag AND BY-PRODUCTS FROM THE ALUMINUM INDUSTRY AS A REFINING FLUX FOR THE STEEL INDUSTRY

THE USE OF WASTE SLAG AND BY-PRODUCTS FROM THE ALUMINUM INDU...

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International Symposium on Global Environment and Steel Industry(ISES’03)

作者： I.D.Sommerville A.McLean Dept. of Materials Science ＆ Engineering University of Toronto OntarioCanada M5S-3E4 Dept. of Materials Science ＆ Engineering University of Toronto OntarioCanada M5S-3E4

＜正＞In this paper, the possibility and practical results of using waste slag and by-products from the aluminum industry as a refining flux in the steel industry are discussed. Several successful processes to convert waste from the aluminum industry to steelmaking fluxes are introduced. Some theoretical aspects of using calcium aluminate based flux in desulphurization are outlined. By intelligent use of metallurgical waste materials, the total disposal of solid waste from metallurgical industries can be reduced.

关键词： Aluminum industry Calcium Aluminate Environment Hot metal desulphurization waste slag

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Utilization of recycled solid waste as ecological reclamation materials based on plant growth experiments and soil quality analysis

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Journal of Mountain Science 2024年第3期21卷 820-834页

作者： QIN Xiaochun NI Anchen YANG Dongxiao XING Wenhu LIU Shiliang College of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China Shanxi Road&Bridge Construction Group Co. LtdShanxi 030006China School of Environment Beijing Normal UniversityBeijing 111875China

During the highway construction,a large number of spoil areas will be generated while a large amount of waste slag and soil could not be rationally ***,the vegetation recovery is slow in the spoil areas due to the soil *** at recycling the solid waste,the sieved engineering waste slag with local red clay and corn straw biochar was supplied to solve the problem of insufficient nutrients in engineering waste slag and *** addition,planting experiments of alfalfa(Medicago sativa L.)and Amorpha fruticosa *** with physical and chemical experiments were carried out to prove the feasibility of the novel improved substrate for the reclamation of spoil *** results show that the substrate's improvement effect is mainly affected by the soil to slag ratio and the biochar *** improvement effect of soil matrix in highway spoil area decreases with the increase of the waste slag content,especially when the soil-slag ratio is less than 3,and the promotion of plants is *** the contrary,the improvement effect is proportional to the biochar content(3%-8%).But it is noted that the Cu and Pb in the soil will exceed the clean limit corresponding to the Nemero soil pollution index level when the biochar content is 8%.Therefore,it is recommended that the soil-slag ratio should be≥3,and the biochar content should reach 3%-5%.This research provides experimental basis and technical support for utilizing solid waste resources in the reclamation of highway spoil areas.

关键词： Highway Spoil area waste slag Modified soil Ecological reclamation

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