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pyrite
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  相似匹配句对
     Morphogenesis of Pyrite
     黄铁矿成因形态学
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     Pyrite Analysis
     黄铁矿单矿物分析
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  pyrite
Molecular stratigraphic parameters, abundant micron gypsums and pyrite framboids show that hypersaline and anoxia prevailed in the F-F transition, the highly stressed environments occurred near the F-F boundary.
      
Leaching of reduced ores (manganocalcite and manganiferous limestone) was mediated mainly by degradation of manganiferous minerals (by sulfuric acid produced in the course of bacterial oxidation of pyrite or sulfur).
      
Inoculation of bacteria into pulp with pyrite increased the rate of leaching of oxide ore (psilomelane) by 37%, and the degree of its extraction within 180 h increased from 80 to 97%.
      
Experimental Modeling of the Cathode Reduction of Carbon Dioxide on Pyrite in Deep Hydrothermal Vents
      
The formation of cementite (Fe3C) or pyrite (FeS2) nanoparticles is revealed, and the quantitative characteristics of the abrasive wear of the material of steel milling bodies are determined.
      
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The Ageenkov's scheme of phase analysis of complicate copper ores has thedisadvantages that(1)most components are not determined directly but calculatedfrom a series of simultaneous equations,(2)some methods are based upon non-stoichiometric reactions,(3)it necessitates the use of potassium cyanide and(4)it neglects the interference of accompanying minerals,such as sphalerite,galena,pyrite etc.An improved scheme is proposed,which eliminates most of the above-mentioneddisadvantages.Malachite is extracted...

The Ageenkov's scheme of phase analysis of complicate copper ores has thedisadvantages that(1)most components are not determined directly but calculatedfrom a series of simultaneous equations,(2)some methods are based upon non-stoichiometric reactions,(3)it necessitates the use of potassium cyanide and(4)it neglects the interference of accompanying minerals,such as sphalerite,galena,pyrite etc.An improved scheme is proposed,which eliminates most of the above-mentioneddisadvantages.Malachite is extracted from the mixture by an alkaline solution ofsodium potassium tartrate in an atmosphere of nitrogen.Cuprite is dissolved bythe same tartrate solution in a current of oxygen.The residue is then treated witha 2% solution of ferric sulphate containing 5% sulphuric acid to dissolve onehalf of the chalcocite copper.A saturated solution of silver sulphate containing 5%of acetic acid is used instead of potassium cyanide for the dissolution of bornitecopper and the remaining cupric sulphide from chalcocite.Preliminary experiments show that sphalerite interferes the determination ofcuprite copper,causing somewhat low results.No interference is observed in thedetermination of other constituents by sphalerite,galena,pyrite and ferrous andferric oxides.The results obtained with the improved scheme are more reliablethan those with Ageenkov's schemes.

本文提出复杂铜矿物相分析的修订方法。用硷性酒石酸盐溶液溶解孔雀石,用同一试剂及氧气溶解赤铜矿,用硫酸铁溶解辉铜矿之半,用硫酸银溶解另一半辉铜矿及斑铜矿,最后用王水溶解黄铜矿。本法除个别情形外,一般组份均直接测定而无须间接计算;避免反应程度不固定的反应;不用剧毒的氰化钾;亦解决象闪锌矿、方铅矿及黄铁矿等伴生矿物的干扰;而结果比现用方法可靠。

Under high pressure and temperature pyrite is oxidized into sulfuric acid and ferric oxide in the acid solution. According to the reaction mechanism reported in the literature, the pyrite is first converted into ferrous sulfate and then is oxidized into ferric sulfate in the solution. On further reaction the ferric salt is hydrolyzed into hydroxide and then changed into ferric oxide. Kinetic studies carried out recently in our Institute indicate that the reaction product α-Fe_2O_3 is the direct oxidation...

Under high pressure and temperature pyrite is oxidized into sulfuric acid and ferric oxide in the acid solution. According to the reaction mechanism reported in the literature, the pyrite is first converted into ferrous sulfate and then is oxidized into ferric sulfate in the solution. On further reaction the ferric salt is hydrolyzed into hydroxide and then changed into ferric oxide. Kinetic studies carried out recently in our Institute indicate that the reaction product α-Fe_2O_3 is the direct oxidation product of pyrite and a new reaction mechanism was proposed. Radioactive Fe~(55,59) was used in this study as tracer to study the reaction mechanism. Results are in agreement with the mechanism proposed recently and indicate that the one reported in the literature is incorrect.

在高溫、高压下酸性溶液中,用空气氧化黄铁矿时生成硫酸及三氧化二鉄。文献上认为反应的机理系先生成硫酸亚鉄,然后氧化为硫酸高铁,硫酸高铁再水解生成三氧化二铁。最近进行的动力学研究表明,反应生成的α-Fe_2O_3,应由黄铁矿直接氧化而来。本工作采用Fe~(55,59)为示踪剂进行反应机理的研究,証明最近研究的結果是正确的,文献上报导的机理与实际情况不符合。

The ore properties and the research work for the selective flotation of the Yinshan lead and zinc ores are outlined in this paper, togther with the discu ssion of the results obtained. The experiments include the flotaion of the different types of the Yinshan ores with different kinds of the flotation reagents and different flowsheets. The authors consider that for the flotaion of the lead and zinc ores, the necessity of using cyanides as depressants depends chiefly on the amounts of pyrite present and...

The ore properties and the research work for the selective flotation of the Yinshan lead and zinc ores are outlined in this paper, togther with the discu ssion of the results obtained. The experiments include the flotaion of the different types of the Yinshan ores with different kinds of the flotation reagents and different flowsheets. The authors consider that for the flotaion of the lead and zinc ores, the necessity of using cyanides as depressants depends chiefly on the amounts of pyrite present and its characters. The flotability of pyrite is closely related with its genesis,

本文叙述1975年6-9月作无氰浮选小型与工业实验成果,并对结果作了分析与探讨。作者认为,对于那些黄铁矿含量少或黄铁矿易被抑制的铅锌矿石,采用优先浮选而不用氰化物作抑制剂是可行的,但对于那些含量大且可浮性好的黄铁矿的矿石,如果完全不用氰化物则要从药方与流程等来考虑。

 
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