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reclamation of CO_(2) sodium silicate used sands by steam leaching

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China Foundry 2023年第6期20卷 537-544页

作者： Ji-jun Lu Wei He Lei Yang Hua-fang Wang School of Mechanical Engineering and Automation Wuhan Textile UniversityWuhan 430200China

The bond film on the surface of the CO_(2) sodium silicate used sands is not easy to decompose,therefore,it is difficult to reclaim used sands.A new reclamation method of CO_(2) sodium silicate used sands was developed by steam leaching,which can reduce the water consumption of reclamation and improve the removal effect of sodium silicate bond film.Firstly,the leaching effect of the sodium silicate sands after 20/200/400/600/800/1,000°C heat preservation treatment was simulated.Furthermore,the influence of the leaching time on the removal effect of the sodium silicate bond film was studied.Finally,the casting properties of the reclaimed sands after the leaching reclamation treatment were tested.The results show for simulated used sands after 30 min of steam leaching,the removal ratio of the alkali exceeds 84.1%,the removal ratio of silicate is 86.2%,and the removal ratio of carbonate is 93.6%.The removal rate of alkali,silicate and carbonate is relatively low in the leaching time of 30-50 min.Considering the reclamation effect and cost,the leaching time is controlled in 30 min.Water consumption is only 60%of the mass of used sands for 30 min steam leaching,while it is 200%for wet reclamation.Morphological analysis shows that most of the hazardous substances in the used sands are removed in 30 min steam leaching,and the reclaimed sands surface after steam leaching in 50 min is as smooth as new sands.After 30 min of steam leaching,the alkali removal effect of the factory used sands can reach 81.5%,the water consumption by the steam leaching reclamation is 58%of the mass of the used sand,which is similar to the result of simulated used sands.The performance of reclaimed sands obtained after 30 min steam leaching is better than that of new sands when the amount of sodium silicate added is 6%of the mass of the reclaimed sands and the CO_(2) blowing time is 15 s:the 24 h ultimate compressive strength of reclaimed sands is 5.6 MPa(equated with new sands),and the collapsibility compressive strength is 5.2 MPa,which is lo

关键词： sodium silicate sands steam leaching simulated temperature reclamation

Impact of marshy area reclamation by various vegetations on soil-nematode community structure in Dachigam National Park

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Soil Ecology Letters 2023年第3期5卷 123-133页

作者： Humira Nesar Shahid Afzal Zarrin Imran Wasim Ahmad Nematode Biodiversity Research Lab Department of ZoologyAligarh Muslim UniversityAligarh 202002India

Marshy areas are ecologically important and sensitive areas which are under immense pressure,such as reclamation by various terrestrial vegetations.However,how these vegetation types disrupt the stability of nematode community is scarce.The present study determined how the soil nematode community responded to shifting environmental states by using nematode abundances,nematode indices and metabolic footprints as indicators.In this context,we selected three types of reclaimed vegetation around a marshy land(MR)in Dachigam National Park,Kashmir,which includes grassland(GL),forest(FR)and cropland(CL)to investigate the soil nematode community.Acrobeloides,Plectus,Eudorylaimus,and Aphelenchus proved more sensitive to reclamation effect.Results revealed decrease in total nematode and bacterivore abundance.reclamation reduced diversity in CL,whereas no effect was observed in the GL and FR as compared to MR.Channel index indicated shift from fungal decomposition to bacterial decomposition pathway in GL.The nematode faunal profile depicted grassland(GL)as the most structured ecosystem compared to MR,FR,and CL.Our results suggest that vegetation type regulates the structure,function,and stability of the soil food web,which has significant implications for managing the vegetation cover in a sustainable manner in the Dachigam National Park.

关键词： nematodes diversity vegetation habitat reclamation

Discussion on Land Use Mode Reform in Coal Opencast Mining

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Asian Agricultural Research 2024年第1期16卷 25-28页

作者： Hong ZHANG Lin LIN CCTEG Shenyang Engineering Company Shenyang 110015China

The existing land supply mode of opencast mining is"land requisition first,then transfer",which lacks an effective recovery and withdrawal mechanism,and the reclaimed mining land is difficult to withdraw.According to the regular rules of coal opencast mining and the periodic characteristics of land use,this paper puts forward a new mode of temporary land use for coal opencast mining.It is conducive to im-proving the quality and scale of land use and reclamation utilization of opencast coal mining,and is of great significance for exploring and for-mulating reasonable land use policies for mineral resources development projects.

关键词： Opencast mine Temporary land use Land requisition reclamation Withdrawal mechanism

Biological removal of methanol from process condensate for the purpose of reclamation

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Journal of Environmental Sciences 2004年第3期16卷 384-386页

作者： WANGYan-ming YANGMin ZHANGYu GAOMeng-chun ZHANGJing ResearchCenterforEeo-EnvironmentalSciences ChineseAcademyofSciencesBeijing100085China

The biological removal of methanol from condensate of ammonia manufacturing processes for the purpose of reclamation using contact type reactor was studied. Methanol of 60 mg/L was removed completely under an HRT of 1 12 h. Optimal inorganic nutrient dose was determined on evaluating methanol removal performance and dehydrogenase activities(DHA) under different nutrition doses. The optimal inorganic nutrient dose only gave an increase of conductivity of ca. 10 μs/cm 2 in the effluent on treating synthetic condensate containing methanol of 30 mg/L. The results demonstrated that biological removal of methanol was effective for the purpose of recovering the methanol bearing condensate.

关键词： reclamation condensate methanol removal biological contact reactor

Selection of optimal land uses for the reclamation of surface mines by using evolutionary algorithms

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International Journal of Mining Science and Technology 2017年第3期27卷 491-498页

作者： Palogos Ioannis Galetakis Michael Roumpos Christos Pavloudakis Francis School of Mineral Resources Engineering Technical University of Crete 73100 Chania Greece Public Power Corporation of Greece-Mines Division 104 42 Athens Greece

A methodology for the selection of the optimal land uses of the reclamation of mined areas is proposed. It takes into consideration several multi-nature criteria and constraints, including spatial constrains related to the permissible land uses in certain parts of the mined area. The methodology combines desirability functions and evolution searching algorithms for selection of the optimal reclamation scheme. Its application for the reclamation planning of the Amynteon lignite surface mine in Greece indicated that it handles effectively spatial and non-spatial constraints and incorporates easily the decision-makers preferences regarding the reclamation strategy in the optimization procedure.

关键词： reclamation Land uses Optimization Evolutionary algorithms Desirability functions

Analysis of Jiangsu Tidal Flats reclamation from 1974 to 2012 Using Remote Sensing

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China Ocean Engineering 2015年第1期29卷 143-154页

作者：赵赛帅刘永学李满春孙超周旻曦张荷霞 Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Nanjing University Collaborative Innovation Center for the South China Sea Studies Department of Geographic Information ScienceNanjing University Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing University

Jiangsu has the most abundant tidal flat resources among China＇s coastal provinces. To ease the conflict between the growing population and shrinking usable land and to promote regional sustainable development, large-scale coastal reclamation development activities have been performed in Jiangsu Province since 1949. The present study has integrated multi-source remote sensing images during 1974 to 2012 by using a Multi-point Fast Marching Method （MFMM） to extract the Jiangsu coastal reclamation areas for different time periods. The temporal and spatial patterns of the extent and elevation of the reclamation areas were analysed in order to determine the unused potential for future reclamation. It will provide information necessary to support the development and construction of tidal flats in Jiangsu. Results show that：（1） the reclaimed tidal fiats along the Jiangsu coast cover more than 19.86×10^4 hm^2, of which 13.97×10^4 hm^2 is located in Yancheng, 4.84×10^4 hm^2 in Nantong, and 1.05×10^4 hm^2 in Lianyungang; （2） the average elevation of the reclaimed Jiangsu tidal flats has gradually decreased over the last 40 years, while those in Dongtai and Rudong have showed particularly accelerated decrease since the 1990s; and （3） in 2012, very few unused tidal flats two meters above the sea level are left along the Jiangsu coast, and mainly concentrated in Yancheng. As there are still reserving some coastal land resources between 0-2 m, providing us with a potential for future development. All of these findings may be useful for researchers and local authorities for the development and utilization of tidal flat resources in Jiangsu.

关键词： tidalflats remote sensing Jiangsu coast developmentpotential reclamation

THE EFFECT OF reclamation IN AREAS BETWEEN ISLANDS IN A COMPLEX TIDAL ESTUARY ON THE HYDRODYNAMIC SEDIMENT ENVIRONMENT

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Journal of Hydrodynamics 2010年第3期22卷 338-350页

作者： LI Meng-guo Key Laboratory of Engineering Sediment of Ministry of Transport Tianjin Research Institute of Water Transport Engineering Tianjin 300456 China

The Oujiang Estuary is a very complex tidal estuary with many islands, which is located in Zhejiang Province, China. reclamation of areas between islands will create a great amount of land. In this article, the feasibility of reclamation of areas between Lingkun Island and Niyu is studied from the angle of its impacts on the hydrodynamic sediment environment. First, the natural hydrodynamic and sediment conditions and the seabed evolution are analyzed according to in-situ data. Second, numerical models of tidal current and sediment movement under the combined action of wave and current are set up with irregular triangular grid to carry out numerical simulations. The following conclusions are drawn from the study. （1） The areas between Linkun Island and Niyu are not a tidal passage. Wenzhou Shoal has been aggraded gradually, a condition favorable for reclamation. （2） The reclamation is feasible as far as its effect on surrounding hydrodynamic sediment environment is concerned. （3） The reclamation has great favorable socio-economic impacts.

关键词： the Oujiang Estuary tidal current numerical model numerical simulation Wenzhou Shoal reclamation

Numerical simulation of hydrodynamic environment effects of the reclamation project of Nanhui tidal flat in Yangtze Estuary

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Journal of Hydrodynamics 2019年第3期31卷 603-613页

作者： Di-fan Cao Yong-ming Shen Mei-rong Su Chun-xue Yu Institute of Environmental and Ecological Engineering Guangdong University of Technology Guangzhou 510006 China Ocean & Hydraulic Engineering Institute Power China Huadong Engineering Corporation Limited Hangzhou 311122 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China Research Center far Eco-Environmental Engineering Dongguan University of Technology Dongguan 523808 China

The reclamation is the main method in the coast exploitation, and the assessment of the hydrodynamic environment effect of the reclamation project is important for project's site selection and environmental protection. With consideration of the baroclinic water, a 3?D numerical model MIKE3 is applied to simulate Yangtze Estuary's hydrodynamic environment to predict the impacts of the reclamation project of the Nanhui tidal flat. The simulated results of the model agree well with the field data of the tide level, the current speed, the current direction, the temperature, the salinity and the water quality, and it is indicated that after the reclamation project, the high tide level will be lower, while the low tide level will be higher in the South Branch in general. During the spring tide in the dry season, the peak velocity during the ebb tide in the North Channel will be reduced by 13%, while it will be increased by 21% in the South Channel in average. The salinity will be increased in the North Channel, while reduced in the South Passage, besides, the reclamation project will aggravate the saltwater intrusion of the North Branch. The value of N/P will be increased by about 4% in the whole South Branch except for the North Channel, leading to a slight aggravation of the phosphorus restriction effect in the Yangtze Estuary.

关键词： Yangtze Estuary 3-D numerical model hydrodynamics nutrients reclamation project

Evaluation of reclamation land productivity in mining districts

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中国有色金属学会会刊：英文版 2011年第S3期21卷 717-722页

作者： WU Xue-qun, ZUO Xiao-qing, FANG Yuan-min Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China Faculty of Land Resource Engineering Kunming University of Science and Technology Kunming 650093 China

In order to evaluate the productivity of reclamation lands in mining districts, field investigation and spatial information technique were adopted to investigate influence factors of land. Based on the collected data of each land, membership grade of each factor was obtained based on Fuzzy logic, and combined weight of each factor was got by analytica1 hierarch process and Delphi method. According to membership grades and combined weights of all factors, integrated fertility index (IFI) of every land was calculated to reflect levels of the productivity of reclamation lands in mining districts. Experimental results show that spatial information technique is an efficient method in field data collection, while lack of evaluation data. By means of quantificational analysis of this method, IFI is appropriate to describe the productive capacity level of reclamation lands.

关键词： mining districts reclamation productivity evaluation membership grade