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基于碎磨参数的介质优化及降低半自磨顽石积累实验研究
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作者 武煜凯 王国强 +3 位作者 朱阳戈 赵志强 肖庆飞 罗思岗 《矿产保护与利用》 2024年第3期102-108,共7页
针对某大型钼矿存在半自磨机顽石积累、产能提升幅度有限等问题,在综合考虑不同测试方法下的碎磨参数及通过压载实验获得顽石粒级的基础上,运用修正后的Azzaroni公式进行钢球直径精确计算,并通过实验室实验进行合理性验证。研究结果表明... 针对某大型钼矿存在半自磨机顽石积累、产能提升幅度有限等问题,在综合考虑不同测试方法下的碎磨参数及通过压载实验获得顽石粒级的基础上,运用修正后的Azzaroni公式进行钢球直径精确计算,并通过实验室实验进行合理性验证。研究结果表明:(1)三种测试方法获得的碎磨参数结果均表明了该矿石的难磨剥特性但在描述矿石抗冲击性能上仍有区别;(2)该矿石的顽石粒级为-80+20 mm;(3)半自磨机的最佳钢球方案为m(Φ130 mm)∶m(Φ110 mm)=1∶1。单一球径Φ130mm中+100 mm充当自磨介质的矿石磨矿产品较选厂Φ120 mm钢球方案提高了11.17百分点,顽石含量降低了1.67百分点;混合球径m(Φ130 mm)∶m(Φ110 mm)=1∶1的+100 mm含量较单一球径Φ130 mm提高了1百分点,顽石含量降低了3.41百分点,验证了所计算的最大钢球直径方案的合理性,并采用混合球径方案获得了更优的磨矿效果。 展开更多
关键词 半自磨机 顽石 落重实验 Bond球磨功指数 力学性质 钢球直径计算 混合球径
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Responses of Soil Microbial Activity and Biomass to Salinity After Repeated Additions of Plant Residues 被引量:2
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作者 Bannur ELMAJDOUB Petra MARSCHNER 《Pedosphere》 SCIE CAS CSCD 2015年第2期177-185,共9页
Microbial adaptation to salinity can be achieved through synthesis of organic osmolytes,which requires high amounts of energy;however,a single addition of plant residues can only temporarily improve energy supply to s... Microbial adaptation to salinity can be achieved through synthesis of organic osmolytes,which requires high amounts of energy;however,a single addition of plant residues can only temporarily improve energy supply to soil microbes.Therefore,a laboratory incubation experiment was conducted to evaluate the responses of soil microbes to increasing salinity with repeated additions of plant residues using a loamy sand soil with an electrical conductivity in saturated paste extract(EC_e) of 0.6 dS m^(-1).The soil was kept non-saline or salinized by adding different amounts of NaCl to achieve EC_e of 12.5,25.0 and 50.0 dS m^(-1).The non-saline soil and the saline soils were amended with finely ground pea residues at two rates equivalent to 3.9 and 7.8 g C kg^(-1) soil on days 0,15 and29.The soils receiving no residues were included as a control.Cumulative respiration per g C added over 2 weeks after each residue addition was always greater at 3.9 than 7.8 g C kg^(-1) soil and higher in the non-saline soil than in the saline soils.In the saline soils,the cumulative respiration per g C added was higher after the second and third additions than after the first addition except with3.9 g C kg^(-1) at EC_e of 50 dS m^(_1).Though with the same amount of C added(7.8 g C kg^(-1)),salinity reduced soil respiration to a lesser extent when 3.9 g C kg^(-1) was added twice compared to a single addition of 7.8 g C kg^(-1).After the third residue addition,the microbial biomass C concentration was significantly lower in the soils with EC_e of 25 and 50 dS m^(_1) than in the non-saline soil at3.9 g C kg^(-1),but only in the soil with EC_e of 50 dS m^(-1) at 7.8 g C kg^(-1).We concluded that repeated residue additions increased the adaptation of soil microbial community to salinity,which was likely due to high C availability providing microbes with the energy needed for synthesis of organic osmolytes. 展开更多
关键词 C availability electrical conductivity microbial biomass C microbial community RESPIRATION saline soil
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