Studies were made on mineral Chinese medicine Yu YuLiang with X-ray powder diffraction andICP-AES.The analysis results are given on qualitative,quantitative,crystal size and trace elements,which indicatethat YuYuLiang...Studies were made on mineral Chinese medicine Yu YuLiang with X-ray powder diffraction andICP-AES.The analysis results are given on qualitative,quantitative,crystal size and trace elements,which indicatethat YuYuLiang is mainly made up of goethite,hematite,quartz and clay minerals.The clay and its content.thecrystal size and trace elements related to human health were found to vary with the origin of the medicine.The resultsmay provide basis for quality evaluation of the medicine.展开更多
This paper summarizes the new developments in the study of barium rare-earth fluor-carbonate mineral structures .The second order superstructure of cebaite -(Ce ) was solved by using high power X-ray single crystal di...This paper summarizes the new developments in the study of barium rare-earth fluor-carbonate mineral structures .The second order superstructure of cebaite -(Ce ) was solved by using high power X-ray single crystal diffractometer . Five kinds of coordination forms were found . All atoms in the cell , including C and F , were properly located . In the process of study in a cordylite-(Ce ), a new mineral was discovered , whose chemical formula is (Ca0.5□0.5) BaCe2 (CO3)4F . It is isostructural with baiyuneboite - (Ce ), but different in composition (Na in baiyuneboite- (Ce ) is substituted by Ca disorderly ) . On the basis of the studies a proposal to re-define cordylite-(Ce )as a mineral group name is put forth by the authors . Finally a new type of twinning of huanghoite-(Ce ) was found on the systematical absence of diffraction data by means of a single crystal diffractometer .展开更多
As high-grade magnesite and brucite resources(hereinafter referred to as magnesium-containing minerals)are decreasing annually,developing flotation separation technologies capable of efficiently and economically extra...As high-grade magnesite and brucite resources(hereinafter referred to as magnesium-containing minerals)are decreasing annually,developing flotation separation technologies capable of efficiently and economically extracting magnesium resources from low-grade magnesium-containing minerals is necessary.Although efficient flotation separation technologies for magnesium-containing minerals are well researched,related concepts are not yet clarified.Moreover,the industrial development of magnesium-containing mineral flotation technologies is limited by their low separation efficiency and environmental problems.This limitation has inhibited the full utilization of low-grade magnesium-containing minerals.This study comprehensively discusses the research progress of flotation separation technologies for magnesium-containing minerals,focusing on the crystal chemical and surface characteristics of magnesium-containing minerals and their gangue minerals,effect of inevitable ions on mineral flotation behavior,interaction effects of minerals,and research advancement of flotation reagents.The study aims to clarify the future development direction of the flotation separation of magnesium-containing minerals and provide theoretical support and technical references for an efficient separation.展开更多
At present,many researchers have studied the modification of biochar and explored the adsorption of cadmium by modified biochar.The adsorption capacity of cadmium for general modified biochar is about 30-150 mg/g.The ...At present,many researchers have studied the modification of biochar and explored the adsorption of cadmium by modified biochar.The adsorption capacity of cadmium for general modified biochar is about 30-150 mg/g.The new biochar(BM)we studied greatly improves the adsorption effect of cadmium in water,and the maximum adsorption capacity of cadmium can reach 400 mg/g,so we tried to apply it to the passivated cadmium in polluted farmland soil.This paper discusses the mechanism of BM passivation of heavy metal cadmium in soil and its protective effect on crop growth.The study found that:(1)the content of cadmium in wheat was 3.98 mg/kg in the soil with BM800.The addition of BM800 reduced the cadmium content of wheat by 75.43%compared with the blank control group;(2)BM contains special iron-containing functional group(-Fe-OOC-,-Fe-R-COOH,-Fe-R-OH,etc.)and aromatic structure C=Cπ,and these structures can react with cadmium to form stable complexes(C=Cπ-Cd,(FeO)2Cd,(Fe-RO)2Cd,etc.);(3)there are special mineral crystal structures XiFeYjOk in BM.XiFeYjOk can react with cadmium to form Cd-XiFejOk.Cd-XiFejOk can stably exist in biochar,and can provide more adsorption sites,which strengthens the adsorption and passivation of cadmium in soil by BM.展开更多
文摘Studies were made on mineral Chinese medicine Yu YuLiang with X-ray powder diffraction andICP-AES.The analysis results are given on qualitative,quantitative,crystal size and trace elements,which indicatethat YuYuLiang is mainly made up of goethite,hematite,quartz and clay minerals.The clay and its content.thecrystal size and trace elements related to human health were found to vary with the origin of the medicine.The resultsmay provide basis for quality evaluation of the medicine.
文摘This paper summarizes the new developments in the study of barium rare-earth fluor-carbonate mineral structures .The second order superstructure of cebaite -(Ce ) was solved by using high power X-ray single crystal diffractometer . Five kinds of coordination forms were found . All atoms in the cell , including C and F , were properly located . In the process of study in a cordylite-(Ce ), a new mineral was discovered , whose chemical formula is (Ca0.5□0.5) BaCe2 (CO3)4F . It is isostructural with baiyuneboite - (Ce ), but different in composition (Na in baiyuneboite- (Ce ) is substituted by Ca disorderly ) . On the basis of the studies a proposal to re-define cordylite-(Ce )as a mineral group name is put forth by the authors . Finally a new type of twinning of huanghoite-(Ce ) was found on the systematical absence of diffraction data by means of a single crystal diffractometer .
基金financially supported by the Open Foundation of State Key Laboratory of Mineral Processing (No.BGRIMM-KJSKL-2024-07)the Open Project of the Key Laboratory of Solid Waste Treatment and Resource Utilization of the Ministry of Education,China (No.23kfgk02)。
文摘As high-grade magnesite and brucite resources(hereinafter referred to as magnesium-containing minerals)are decreasing annually,developing flotation separation technologies capable of efficiently and economically extracting magnesium resources from low-grade magnesium-containing minerals is necessary.Although efficient flotation separation technologies for magnesium-containing minerals are well researched,related concepts are not yet clarified.Moreover,the industrial development of magnesium-containing mineral flotation technologies is limited by their low separation efficiency and environmental problems.This limitation has inhibited the full utilization of low-grade magnesium-containing minerals.This study comprehensively discusses the research progress of flotation separation technologies for magnesium-containing minerals,focusing on the crystal chemical and surface characteristics of magnesium-containing minerals and their gangue minerals,effect of inevitable ions on mineral flotation behavior,interaction effects of minerals,and research advancement of flotation reagents.The study aims to clarify the future development direction of the flotation separation of magnesium-containing minerals and provide theoretical support and technical references for an efficient separation.
基金supported by the National Natural Science Foundation of China(no.41571283)the National Key Research and Development Program of China(2018YFD0800703,2016YFD0800702)the Fundamental Research Funds for the Central Universities(2662018PY078)。
文摘At present,many researchers have studied the modification of biochar and explored the adsorption of cadmium by modified biochar.The adsorption capacity of cadmium for general modified biochar is about 30-150 mg/g.The new biochar(BM)we studied greatly improves the adsorption effect of cadmium in water,and the maximum adsorption capacity of cadmium can reach 400 mg/g,so we tried to apply it to the passivated cadmium in polluted farmland soil.This paper discusses the mechanism of BM passivation of heavy metal cadmium in soil and its protective effect on crop growth.The study found that:(1)the content of cadmium in wheat was 3.98 mg/kg in the soil with BM800.The addition of BM800 reduced the cadmium content of wheat by 75.43%compared with the blank control group;(2)BM contains special iron-containing functional group(-Fe-OOC-,-Fe-R-COOH,-Fe-R-OH,etc.)and aromatic structure C=Cπ,and these structures can react with cadmium to form stable complexes(C=Cπ-Cd,(FeO)2Cd,(Fe-RO)2Cd,etc.);(3)there are special mineral crystal structures XiFeYjOk in BM.XiFeYjOk can react with cadmium to form Cd-XiFejOk.Cd-XiFejOk can stably exist in biochar,and can provide more adsorption sites,which strengthens the adsorption and passivation of cadmium in soil by BM.
