Kinetics of Calcite Dissolution in pH-region of Acid Rain.

酸雨 pH 范围内方解石溶解动力学。

基本信息

  • 批准号:
    02650448
  • 负责人:
  • 金额:
    $ 1.28万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1990
  • 资助国家:
    日本
  • 起止时间:
    1990 至 1991
  • 项目状态:
    已结题

项目摘要

The dissolution of limestone collected from Akiyoshidai, Yamaguchi Pref., Japan, In dilute hydrochloric acid solution has been followed by measurement both calcium concentration and pH as a function of time, under various conditions of Initial pH, temperature and stirring rate. The initial dissolution rate increases as the stirring rate increasing. The Arrhenius plot shows that apparent activation energy at 7OOrpm of stirring rate is 15kJ/mol for Initial pH4 and 25kJ/mol for Initial pH5.The viscosity of water depends on temperature and differs about two times within the range from 5゚C to 40゚C in this experimental conditions, so stirring rate cannot express the real conditions of bulk fluid. In spite of stirring rate, Stirring Reynolds Number Re_s, which is one of non-dimension numbers possible to express fluid condition, defined as pd^2n/mu, where rho is the density of water, d characteristic length of stirring rate, n the revolutions per second, mu the viscosity of water, is proposed.The initial dissolution rate at initial pH4 is almost proportional to Re_s and is independent from temperature. These facts suggest that the dissolution reaction process of calcite is much faster than the mass transport process of species. In the case of Initial pH5, the initial dissolution rate increases as Re_s Increasing and as temperature raising. The apparent activation energy of initial dissolution rate at Re_s = 7X10^4 for initial pH4 is lkj/mol and for initial pH5 is 12kJ/mol. These values are smaller than those obtained from stirring rate, because the previous studies have not considered fluid condition in estimation of the activation energy.The facts mentioned above suggest that dissolution of calcite in weak acid region Is mass transport controlled reaction.
从山口县秋吉台采集的石灰石溶解,日本,在稀盐酸溶液中,在初始pH值、温度和搅拌速率的各种条件下,测量钙浓度和pH值随时间的变化。初始溶解速率随搅拌速率的增加而增加。Arrhenius图表明,搅拌速率为700 rpm时,初始pH为4时的表观活化能为15 kJ/mol,初始pH为5时的表观活化能为25 kJ/mol。在本实验条件下,水的粘度与温度有关,在5 ℃ ~ 40 ℃范围内,粘度相差约2倍,搅拌速率不能反映本体流体的真实的状态。无论搅拌速率如何,搅拌雷诺数Re_s都是可以表达流体状态的无因次数之一,定义为pd^2n/mu,其中rho是水的密度,d是搅拌速率的特征长度,n是每秒的转数,μ是水的粘度。初始pH 4时的初始溶解速率几乎与Re_s成正比,与温度无关。这些事实表明,方解石的溶解反应过程比物质的传质过程快得多。在初始pH为5时,初始溶解速率随Re_s的增大和温度的升高而增大。在Re_s = 7 × 10 ~(-4)时,初始pH为4时的表观溶解活化能为1 kJ/mol,初始pH为5时的表观溶解活化能为12 kJ/mol。由于以往的研究在计算活化能时没有考虑流体条件,因此这些数值都小于由搅拌速率得到的数值,这表明方解石在弱酸区的溶解是传质控制的反应。

项目成果

期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
"Dissolution Mechanism of Calcite" T.Shibuya,Y.Niibori,N.Tsuchiya & T.Chida. A-2 (1991)
《方解石的溶解机理》 T.Shibuya,Y.Niibori,N.Tsuchiya
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
T.Shibuya,Y.Niibori,N.Tsuchiya,& T.chida: "Dissolution Mechanisum of Calcite" Abstracts of 1991 Joint Annual Meeting of SMGJ,JAM,PEG & MSJ. A-2 (1991)
T.涩谷、Y.新堀、N.土谷、
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
渋谷 健,新堀 雄一,土屋 範芳,千田 佶: "弱酸性域における方解石の溶解速度" 資源地質学会誌. (1992)
Ken Shibuya、Yuichi Shinbori、Noriyoshi Tsuchiya、Kei Senda:“弱酸性地区方解石的溶解速度”日本自然资源地质学会杂志(1992 年)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
T. Shibuya, Y. Niibori, N. Tsuchiya & T. Chida: "Dissolution Rate of Calcite in Weak Acid Region" J. of Minelogical Society of Japan. (1992)
T.涩谷、Y.新堀、N.土屋
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  • 影响因子:
    0
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CHIDA Tadashi其他文献

CHIDA Tadashi的其他文献

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{{ truncateString('CHIDA Tadashi', 18)}}的其他基金

Hybrid System for in-situ Remediation of Contaminated Soil by Chlorinated Organic Compounds
含氯有机化合物污染土壤原位修复混合系统
  • 批准号:
    14205150
  • 财政年份:
    2002
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Establishment of an analytical method for bacterial behaviors in an oil reservoir.
油藏细菌行为分析方法的建立
  • 批准号:
    11450394
  • 财政年份:
    1999
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Joint Research on Microbial Enhancement Oil Recovery.
微生物强化采油联合研究。
  • 批准号:
    10044116
  • 财政年份:
    1998
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Development of an cultivation in oil reservoir for microbial enhanved oil recovery
用于微生物强化采油的油藏培养方法的开发
  • 批准号:
    09450381
  • 财政年份:
    1997
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Joint Research on Microbial Enhancement Oil Recovery
微生物提高采收率联合研究
  • 批准号:
    08044116
  • 财政年份:
    1996
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for international Scientific Research
Research of Reduction of Productive Inhibition Used Iron-oxidizing Bacteria
铁氧化菌还原生产抑制作用的研究
  • 批准号:
    07651144
  • 财政年份:
    1995
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Improvement of Enrichment Culture Used Iron-oxidizing Bacteria having Inhibition to Cupper
对铜有抑制作用的铁氧化菌富集培养的改进
  • 批准号:
    05555275
  • 财政年份:
    1993
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Role of calcite on carbon cycle in global scale
方解石对全球碳循环的作用
  • 批准号:
    04650582
  • 财政年份:
    1992
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Effects of Silica Polymization on Apparent Viscosity of Geothermal Water - Fundamental Study on Precipitation of Silica Scale -
二氧化硅聚合对地热水表观粘度的影响 - 二氧化硅垢沉淀的基础研究 -
  • 批准号:
    62550456
  • 财政年份:
    1987
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Flotation Process Control by Adaptive Control Method
自适应控制方法的浮选过程控制
  • 批准号:
    61850111
  • 财政年份:
    1986
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research

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