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冶金原理 PowerPoint PPT Presentation


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冶金原理. 任务驱动 18 调整矿物浸出的速度. 上一章. 目 录. 任务要点一 浸出反应的动力学 任务要点二 影响浸出速度的因素. 任务要点一 浸出反应的动力学. 矿物的浸出反应是属于水溶液与固体物质之间的多相反应体系,在多相体系中,反应是在相界面上发生的。反应过程包括在相界面上发生的结晶 — 化学反应过程,和溶剂向相界面迁移与反应产物由相界面排开的扩散过程。 为了分析浸出过程的动力学,知道浸出动力学方程,就必须了解过程在各个具体情况下进行的机理及其影响因素。下面按照浸出反应分类来进行讨论。. 一、简单溶解反应的动力学方程

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冶金原理

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18


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dc/dt

Kp

Cs

Ctt

18-1KpDKp=D/,

D=1/3dRT/N 18-2


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T

d

R

N

=K/Vn (18-3)

K

V

N0.6


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t=0Ct=018-1

(18-4)

18-418-4lgCs/(Cs-Ct)tKD

ZnO+H2SO4=ZnSO4+H2O


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ZnOH2SO4ZnO


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1

2

3

4

5

6


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[345][126]

VD=-dc/dt=DCL-Ci/=KD(CL-Ci) (18-5)


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VD

CL-Ci/

D1

CL

Ci

KDD/


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= -dC/Dt = (18-6)

-

Ci

N


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V=-dC/dt=KRKp/KR+KD (18-7)

1KR<<KD,18-7KR+KDKD,18-7

V=KDCL


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2KD<<KR8-7KR+KDKR18-7

V=KDCL

KRKD/(KR+KD)K18-7

- dC/dt=KCL (18-8)

t=0CL=Co18-8


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lnCo/CL=Kt (18-9)

Co

18-9lnCo/CLtK

18-9


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-


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1.

2Ag+4NaCN+O2+2H2O=2NaAg(CN)2+2NaOH+H2O2

2Ag+4CN-2e=2Ag(CN)-

O2+2H2O+2e=H2O2+2OH-


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18-5


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18-5

>>[ ]s0,[ ]s0,


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[ ]

[ ]s

t


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CN-

[ ]

[ ]s

t


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O2 V


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A=A1+A2

V= 18-10

1[ CN-][O2]

V=1/2DCN-[CN-]A

[CN-]

2[CN-][O2]


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V=2/Do2[O2]A

[O2]

A1=A2,[CN-]/[O2]=4Do2/DCN-

O2CN-

Do2=2.7610-5cm2s-1

DCN-=1.8310-5cm2s-1

Do2/DCN-=1.5,[CN-]/[O2]=41.5=6


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  • [CN-]/[O2]=6[CN-]/[O2] 4.69~7.418-6


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18-6


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  • 0.2710-3molL-1,60.2710-3 molL-1

  • 2 MeSH2O MeSPHZnS

    ZnS+1/2O2+2H+ Zn2++S0+H2O


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  • ZnS-2eZn2++S0

  • 1/2O2+2H++2eH2O

  • S0+3/2O2+H2OSO42-+2H+

  • 393K393K


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18-6


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  • PH

  • 18-6


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  • --


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  • Kc

  • R

  • Kk

  • 29288~83680Jmol-1


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  • 283K2~42~4

  • KD

  • WD


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836.8~29288Jmol-1

  • 1.5


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