Petrological,mineralogical and geochemical studies carried out on kaolinite deposits in Haerwusu surface mine,Jungar Coalfield,northern Ordos Basin,North China,define their characteristics,ore genesis and economic int...Petrological,mineralogical and geochemical studies carried out on kaolinite deposits in Haerwusu surface mine,Jungar Coalfield,northern Ordos Basin,North China,define their characteristics,ore genesis and economic interest.Based on the crystalline size,two different types of kaolinite rocks,cryptocrystalline and grainy,were identified under the microscope.XRD data show that kaolinite is the predominant mineral,associated with boehmite,magnesite,anatase,pyrite,diaspore and calcite.However,high boehmite content(mean 70%)shows up in the middle layers.Kaolinite minerals present homogeneous shape and a good crystallinity(HI=0.96–1.26).Geochemical studies show that the SiO_(2)/Al_(2)O_(3)molar ratio of kaolinite is close to the theoretical value,and the contents of Na_(2)O,K_(2)O,CaO,Mg O are less,suggesting a strong chemical weathering environment.The REE and Eu anomalies show a close relationship between kaolinite and the Yinshan Oldland granite.A Ce anomaly reflects a continental sedimentary environment with shallow water.A temperature range of 26.7–34℃was calculated on the basis of the isotopic signatures(δ18O,δD)of the kaolinite rocks.All these data indicate that the formation of the kaolinite is caused mainly by the dissolution,coagulation,precipitation and recrystallization of aluminosilicate clastics in acidic conditions.The formation of boehmite in the middle layers indicates that the source rocks have changed.Boehmite is mainly formed by dehydration and compaction of an aluminum-rich colloid which transported into peat swamp during diagenesis.In addition,it formed by desiliconization of kaolinite under acidic conditions.Due to its high kaolinite content(up to 90%)and low iron mineral content(less than 1%),and good crystallinity,kaolinite deposits occurred at Haerwusu surface mine probably have great economical value in the future.展开更多
以安梨为原料酿造低醇安梨果酒。以褐变抑制率为考察指标,通过单因素试验及正交试验优化低醇安梨果酒复合护色剂配比;以酒精度和感官评分评价指标,通过单因素试验及响应面试验优化低醇安梨果酒发酵工艺,并采用顶空固相微萃取(HS-SPME)...以安梨为原料酿造低醇安梨果酒。以褐变抑制率为考察指标,通过单因素试验及正交试验优化低醇安梨果酒复合护色剂配比;以酒精度和感官评分评价指标,通过单因素试验及响应面试验优化低醇安梨果酒发酵工艺,并采用顶空固相微萃取(HS-SPME)联合气相色谱-质谱(GC-MS)技术分析果酒挥发性风味成分。结果表明,最佳复合护色剂配比为L-抗坏血酸0.36 g/100 m L、壳聚糖0.35 g/100 m L、乙二胺四乙酸二钠(EDTA-2Na)0.06 g/100 m L。低醇安梨果酒最佳发酵工艺为初始糖度9.8%、发酵时间98 h、发酵温度25℃、酵母菌接种量0.1%。在此优化条件下,低醇安梨果酒酒精度为4.35%vol,感官评分为93.42分。HS-SPME-GC-MS结果表明,低醇安梨果酒共检测出42种挥发性风味化合物,其中醇类9种、酯类11种、酸类8种、烷烃类8种、酚类2种、酮类1种、其他类3种。展开更多
基金supported financially by the Science and Technology Major Projects of Shanxi Province of China(grant No.20181101003)the National Key R&D Program of China(grant No.2019YFC1904903)。
文摘Petrological,mineralogical and geochemical studies carried out on kaolinite deposits in Haerwusu surface mine,Jungar Coalfield,northern Ordos Basin,North China,define their characteristics,ore genesis and economic interest.Based on the crystalline size,two different types of kaolinite rocks,cryptocrystalline and grainy,were identified under the microscope.XRD data show that kaolinite is the predominant mineral,associated with boehmite,magnesite,anatase,pyrite,diaspore and calcite.However,high boehmite content(mean 70%)shows up in the middle layers.Kaolinite minerals present homogeneous shape and a good crystallinity(HI=0.96–1.26).Geochemical studies show that the SiO_(2)/Al_(2)O_(3)molar ratio of kaolinite is close to the theoretical value,and the contents of Na_(2)O,K_(2)O,CaO,Mg O are less,suggesting a strong chemical weathering environment.The REE and Eu anomalies show a close relationship between kaolinite and the Yinshan Oldland granite.A Ce anomaly reflects a continental sedimentary environment with shallow water.A temperature range of 26.7–34℃was calculated on the basis of the isotopic signatures(δ18O,δD)of the kaolinite rocks.All these data indicate that the formation of the kaolinite is caused mainly by the dissolution,coagulation,precipitation and recrystallization of aluminosilicate clastics in acidic conditions.The formation of boehmite in the middle layers indicates that the source rocks have changed.Boehmite is mainly formed by dehydration and compaction of an aluminum-rich colloid which transported into peat swamp during diagenesis.In addition,it formed by desiliconization of kaolinite under acidic conditions.Due to its high kaolinite content(up to 90%)and low iron mineral content(less than 1%),and good crystallinity,kaolinite deposits occurred at Haerwusu surface mine probably have great economical value in the future.
文摘以安梨为原料酿造低醇安梨果酒。以褐变抑制率为考察指标,通过单因素试验及正交试验优化低醇安梨果酒复合护色剂配比;以酒精度和感官评分评价指标,通过单因素试验及响应面试验优化低醇安梨果酒发酵工艺,并采用顶空固相微萃取(HS-SPME)联合气相色谱-质谱(GC-MS)技术分析果酒挥发性风味成分。结果表明,最佳复合护色剂配比为L-抗坏血酸0.36 g/100 m L、壳聚糖0.35 g/100 m L、乙二胺四乙酸二钠(EDTA-2Na)0.06 g/100 m L。低醇安梨果酒最佳发酵工艺为初始糖度9.8%、发酵时间98 h、发酵温度25℃、酵母菌接种量0.1%。在此优化条件下,低醇安梨果酒酒精度为4.35%vol,感官评分为93.42分。HS-SPME-GC-MS结果表明,低醇安梨果酒共检测出42种挥发性风味化合物,其中醇类9种、酯类11种、酸类8种、烷烃类8种、酚类2种、酮类1种、其他类3种。
