JICA SATREPS RESARCHPROJECT

Kabwe Mining Pollution
Amelioration Initiative ProjectGroup 3
School of Mine, the University of Zambia
Faculty of Engineering, Hokkaido University

Group 3 Activities• Characterization of mine wastes and groundwaterin Kabwe• Sampling and characterizing dust in Kabwe• In situ pilot-scale embankment experiments inUNZA• Monitoring the mobility of heavy metals, such as
Pb, Cu, and Zn, and evaluation of theeffectiveness of countermeasures against
immobilizing heavy metals• Capacity building of remediation and relatedtechnologies

Characterization of mine wastes• Chemical compositions• Mineralogical compositions• Leaching experiments

Adsorption (or immobilization) tests
FeSO4, dolomite, zero-valent Fe, and zeolite
were selected.

Sampling locations of soil samples
Results of XRF
Element

Sample 1

Sample 1 Sample 2Si(wt.%)

20.9

45.8

Fe(wt.%)

45.8

3.3

Pb(wt.%)

10.9

40Zn
(wt.%)

8.1

23.1

Samples 1 and 2 containhigher Pb and Zn.

Sample 2
There are a variety of tailings in Kabwe. However, two samples were selected forimmobilization tests.

Adsorption of Zn in Zn leaching residues
10001000ZnCu
Pb
Cd

100
10Concentration (mg/L)

10.1
0.01

024

6810ZnCu
Pb
Cd

100
10
10.1
0.01

02Adsorbent added (%)

681011

Adsorbent A is effective in reducing theconcentration of Cu.
Adsorbent B is effective in reducing theconcentrations of heavy metals.

4

Adsorbent added (%)
Adsorbent A
Adsorbent B

109pH

Concentration (mg/L)

Adsorbent B (dolomite)

Adsorbent A (FeSO4)8765024

68Adsorbent added (%)

10Characterization of geochemical
condition in Kabwe• Excavation of three boreholes (10 - 15 m deep)• Continuous monitoring of the groundwater levels• Periodic sampling for groundwater chemistry• Dust sampling and chemical analysis

Adsorption (or immobilization) tests

Location of boreholes in Kabwe

Borehole in Kabwe

Groundwater sampling by pumping

Groundwater sampling by bailer

In situ pH, EC, and ORP measurements

Dust sampling

Sampling points

Sampling> 1.1 μm7~1.1 μm
4.7~7 μm
3.3~4.7 μm

2.1~3.3 μm
1.1~2.1 μm

Collected dust on the filter

0.65~1.1 μm
0.43~0.65 μm

Pilot scale test site in UNZA

Panorama◎Storage place of Soil in UNZA(15°39′7.85′′S28°33′6.77′′N)

Pilot scale tests
We selected calcinated dolomite for pilot scale tests.

1m

We construct 4 embankments using Zn leaching residues.

2m
Case 1 : Covering soil

Case 3 : Dolomite + covering soil

Case 2 : Dolomite

Case 4 : Covering soil + plant11

Location setting of pilot tests

Excavation of surface soil for pilot tests

Excavation of pit for effluent (1)Excavation of pit for effluent (2)Excavation of Tailings from Kabwe

Tailings transported from Kabwe

Transported by a dump truck

An impermeable sheet is used for storage

Dolomite sampling (2017 July)

United quarries Ltd.,
Oriental Quarries Ltd.,and others

XRD, XRF, andAdsorption tests

Selection of highquality dolomite

Calcination of dolomite (2017 September)

Original dolomite from Oriental Quarries

Furnace of NISIR

Measurements ofbulk density before
and after calcination

Roller mill for crushingcalcinated dolomiteof NISIRPortable heavy metal analysis methodSampling of heavy metal-bearing solution

Groundwater sampling using a bailer

Colorimetry