CAJ | 학술논문

我国著名大型锡矿大厂矿区的100号矿体是一个不规则的大脉状矿体，由质密锡铅锌矿石组成。该大脉矿体长度约1200多米。大厂矿区矿床形成过程有两个主要矿化阶段：早期锡石硫化物阶段和晚期的硫盐锡石多金属矿化阶段。矿物流体包体数据表明：早期形成于300～400℃（450℃）条件下，有高盐度流体包体与低盐度流体包体共存，流体处于从超临界流体进入近临界的气液两相不混溶区过渡阶段，有流体沸腾现象；晚期流体盐度变化小处于降温过程。而100号矿体形成于300～360℃，压力较低，仅为8．24MPa。本次研究设计一含锡溶液从超临界态进入亚临界态的气液不混溶区的实验，研究金属在气-液间再分配过程。实验模拟一个非平衡的气液分离反应动力学过程。重点研究含Sn-NaHCO3-HCl-H2 O在近临界压（25～22MPa）和8～14MPa、380～300℃条件下，在亚临界态气-液两相不混溶区时相分离过程。气液分离实验是恒压降温过程。结果表明：近临界区NaHCO3-HCl-H2 O的NaCl-H2 O体系出现气-液（L-V）分离现象。降温远离临界点时，在 V 与 L 相里的 Na、Cl浓度比：Na（V/L）、Cl（V/L）比值多数远小于1，Na、Cl主要分布在液相里。实验表明出现含Sn溶液的V-L两相分离过程，并且，Sn已在L-V 间再分配，Sn（V/L）多数大于1。说明Sn 多数情况下分布于气相里（贫NaCl 富 H2 O-CO2）。在380～250℃范围内 NaCl-H2 O-CO2体系包含的 H2 O-CO2体系也出现 V-L 两相不混溶区。实验发现H2 O-CO2的L-V分离过程中，气相里 HCO-3和CO2-3分布很少，CO2多。同时，锡在 H2 O-CO2的L-V 间也存在再分配，锡分布在富CO2气体里。实验说明富CO2气体迁移锡。实验为地质解释提供依据，说明100号矿体形成于快速减压的大型裂隙条件下。在300～360℃下压力减低，使含金属流体迅速进入L-V两相不混溶区，气体快速迁移金属，快速沉积金属矿石。我國著名大型錫礦大廠礦區的100號礦體是一箇不規則的大脈狀礦體，由質密錫鉛鋅礦石組成。該大脈礦體長度約1200多米。大廠礦區礦床形成過程有兩箇主要礦化階段：早期錫石硫化物階段和晚期的硫鹽錫石多金屬礦化階段。礦物流體包體數據錶明：早期形成于300～400℃（450℃）條件下，有高鹽度流體包體與低鹽度流體包體共存，流體處于從超臨界流體進入近臨界的氣液兩相不混溶區過渡階段，有流體沸騰現象；晚期流體鹽度變化小處于降溫過程。而100號礦體形成于300～360℃，壓力較低，僅為8．24MPa。本次研究設計一含錫溶液從超臨界態進入亞臨界態的氣液不混溶區的實驗，研究金屬在氣-液間再分配過程。實驗模擬一箇非平衡的氣液分離反應動力學過程。重點研究含Sn-NaHCO3-HCl-H2 O在近臨界壓（25～22MPa）和8～14MPa、380～300℃條件下，在亞臨界態氣-液兩相不混溶區時相分離過程。氣液分離實驗是恆壓降溫過程。結果錶明：近臨界區NaHCO3-HCl-H2 O的NaCl-H2 O體繫齣現氣-液（L-V）分離現象。降溫遠離臨界點時，在 V 與 L 相裏的 Na、Cl濃度比：Na（V/L）、Cl（V/L）比值多數遠小于1，Na、Cl主要分佈在液相裏。實驗錶明齣現含Sn溶液的V-L兩相分離過程，併且，Sn已在L-V 間再分配，Sn（V/L）多數大于1。說明Sn 多數情況下分佈于氣相裏（貧NaCl 富 H2 O-CO2）。在380～250℃範圍內 NaCl-H2 O-CO2體繫包含的 H2 O-CO2體繫也齣現 V-L 兩相不混溶區。實驗髮現H2 O-CO2的L-V分離過程中，氣相裏 HCO-3和CO2-3分佈很少，CO2多。同時，錫在 H2 O-CO2的L-V 間也存在再分配，錫分佈在富CO2氣體裏。實驗說明富CO2氣體遷移錫。實驗為地質解釋提供依據，說明100號礦體形成于快速減壓的大型裂隙條件下。在300～360℃下壓力減低，使含金屬流體迅速進入L-V兩相不混溶區，氣體快速遷移金屬，快速沉積金屬礦石。
아국저명대형석광대엄광구적100호광체시일개불규칙적대맥상광체，유질밀석연자광석조성。해대맥광체장도약1200다미。대엄광구광상형성과정유량개주요광화계단：조기석석류화물계단화만기적류염석석다금속광화계단。광물류체포체수거표명：조기형성우300～400℃（450℃）조건하，유고염도류체포체여저염도류체포체공존，류체처우종초림계류체진입근림계적기액량상불혼용구과도계단，유류체비등현상；만기류체염도변화소처우강온과정。이100호광체형성우300～360℃，압력교저，부위8．24MPa。본차연구설계일함석용액종초림계태진입아림계태적기액불혼용구적실험，연구금속재기-액간재분배과정。실험모의일개비평형적기액분리반응동역학과정。중점연구함Sn-NaHCO3-HCl-H2 O재근림계압（25～22MPa）화8～14MPa、380～300℃조건하，재아림계태기-액량상불혼용구시상분리과정。기액분리실험시항압강온과정。결과표명：근림계구NaHCO3-HCl-H2 O적NaCl-H2 O체계출현기-액（L-V）분리현상。강온원리림계점시，재 V 여 L 상리적 Na、Cl농도비：Na（V/L）、Cl（V/L）비치다수원소우1，Na、Cl주요분포재액상리。실험표명출현함Sn용액적V-L량상분리과정，병차，Sn이재L-V 간재분배，Sn（V/L）다수대우1。설명Sn 다수정황하분포우기상리（빈NaCl 부 H2 O-CO2）。재380～250℃범위내 NaCl-H2 O-CO2체계포함적 H2 O-CO2체계야출현 V-L 량상불혼용구。실험발현H2 O-CO2적L-V분리과정중，기상리 HCO-3화CO2-3분포흔소，CO2다。동시，석재 H2 O-CO2적L-V 간야존재재분배，석분포재부CO2기체리。실험설명부CO2기체천이석。실험위지질해석제공의거，설명100호광체형성우쾌속감압적대형렬극조건하。재300～360℃하압력감저，사함금속류체신속진입L-V량상불혼용구，기체쾌속천이금속，쾌속침적금속광석。
Experiments on Sn transportation by vapors and related ore forming mechanism about orebody No100 in Dachang Tin orefield.There is a large orebody No.100 in the famous,Dachang Tin ore-field.This orebody exhibits an irregular form distributed within more than 1200m in length.The ore formations can be divided into two stages:early stage of cassiterite-sulfides,and late stage of cassiterite-Pb/Sb sulfide-sulfosalt.Fluid inclusion data from minerals indicates that in the early stage,at 300~400℃(450℃),high salinity fluid inclusions coexist with the low salinity fluid inclusions.Those data demonstrate that the ore bearing supercritical fluids progressively entered in to L-V two phase immiscibility field-boiling phenomena were present.In the late stage,the variation in salinity is small,and temperature deceases continuously. The orebody No 100 occurred at temperatures 300 to 360℃,and pressure at 8.24MPa.This study designed L-V immiscibility field experiments,in which Sn bearing super-critical fluids fall in the subcritical states,and focused analyzing Sn redistribution between vapor and liquid phases as entering in L-V two phase immisciblity field.The experiments are non-equilibrium processes.Experiments mainly concentrated on analyzing the L-V separation in + the V-L two phase immiscibility field as a supercritical fluids (Zn)-NaHCO3-HCl-H2 O entering to sub-critical state at pressures 25~22MPa and 8~14MPa,at temperatures from 380~300℃.The experiments are isobaric processes and decreasing temperature.Results indicate that the L-V separation of NaCl-H2 O occurred in the sub-critical states of the Sn-NaHCO3-HCl-H2 O.As far from the critical point,Na and Cl distributed in vapor and liquid,Na (V/L )and Cl (V/L )are progressively less than 1 .It shows that Na and Cl mainly distributed in liquid phase.Those facts demonstrated that metal redistribution between vapor and liquid phases occurred,and Sn redistributed between L and V phases.Sn (V/L)is always much larger than 1 .Sn is distributed in a poor-NaCl,H2 O-CO2 vapor phase.At temperatures from 380~250℃,H2 O-CO2 V-L two phase immiscibility field occurred in the NaCl-H2 O-CO2 .Experiments found that in the L-V separation processes of H2 O-CO2 ,HCO-3 and CO2-3 are weakly distributed in vapor phase,and mainly distributed in liquid phase.CO2 is rich in vapor phase.Sn is redistributed between in liquid and in vapor phases,and is rich in vapor phases.Experiments demonstrated that ore precipitated rapidly in the large cranny as it rapidly opened,then forming large orebody No 100.At temperatures from 300~360℃ and at low pressure (8.24MPa),ore-forming fluids entering L-V two phase immisciblity field,the vapor phase bearing Sn,Zn etc.,transported rapidly and ores precipitated quickly.