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�S��,��r(n��ng)�I(y��)��Ѹ�ٰl(f��)չ��(l��i),��ڭh(hu��n)��ȾӰ푳��й�ˮ��¹��l�l(f��),��o��ˮ��ȫ��ˇ�(y��n)��{��l(f��)ȫ��(hu��)�ĸ߶��P(gu��n)ע[1-2],��ˮ�к��е��Ⱦ��鏊(qi��ng)��°��,��ҿ��ǰ�Ѫ��²��֮һ[3]��Ї�(gu��)��ˮ�l(w��i)��(bi��o)��(zh��n)��Ҏ(gu��)��,��ˮ�е��ֵ��0.02 mg/L[4],��ԇ�(y��n)��(j��)ˮ��ډA�ԗl��µĿɳ��ԣ��û��W(xu��)��͏�(qi��ng)��(li��n)�ü��g(sh��)��(du��)ˮԴˮ�е��M(j��n)��ȥ��̎��,��ԁ�(l��i)ˮ�S��(y��ng)��(du��)ͻ�l(f��)ˮԴ��Ⱦ�ṩ��g(sh��)��(j��),��

1 ԇ�(y��n)��

1.1 ԭˮˮ�|(zh��)

�|��ˮԴˮ��pH ��7.0~7.2,��Ȟ�23.4~67.8 NTU,��A�Ȟ�22.3~30.1 mg/L��1.87~2.31 mg/L,��懘�(bi��o)��(zh��n)ԇ��(20 mg/L),��Ƴ�ԇ�(y��n)��ˮ��

1.2 ��Ҫ��(xi��ng)Ŀ��

pH��pH Ӌ(j��),��ȣ�ɢ��ȃx,��懣�늸��ϵ��x��w�|(zh��)�V(ICP-MS),��

1.3 ԇ�(y��n)��

��ȡ1 Lԇ�(y��n)��ˮ��1 L��У��0.1 mol/LHCl ��0.1 mol/LNaOH �A(y��)��{(di��o)��(ji��)pH,��Ͷ�Ӿۺ��Ȼ��X��,��o��30 min ��ȡ��Һ��ICP-MS �y(c��)��ˮ懝��,�,��^(gu��)�̲��(li��n)��ԇ�(y��n)��C(j��)��1��ʾ,��

��1 ��

Tab.1 Mechanical process of coagulation and sedimentation

2.1 pH ��(du��)�̎��Ч��Ӱ�

�ږ|��ԭˮ�м��懘�(bi��o)��(zh��n)ԇ��,��Ƴɝ�ȷքe��0.04mg/L��0.10 mg/L ��ԇ�(y��n)��ˮ,��{(di��o)��(ji��)pH ��7.0~10.0 ֮�g,��Ͷ��1.2 mg/L �ۺ��Ȼ��X(��Al2O3 Ӌ(j��))��y(c��)��ˮ��ʣ��懝��,��Y(ji��)��D1 ��ʾ,��

�D1 pH ��(du��)��ˮ懝�ȵ�Ӱ�

Fig.1 Influence of pH on nickel concentration in outflow

�ĈD1 ��Կ��S��pH ��,��ˮ��懝�ȳʬF(xi��n)�½��څ��(sh��),��ȥ��S��pH ��߶��󡣮�(d��ng)ԭˮ��懝�Ȟ顶��ˮ�l(w��i)��(bi��o)��(zh��n)��ֵ��2 ��r(sh��),��Ͷ��1.2 mg/L�ۺ��Ȼ��X,��Ҫ��pH �{(di��o)��(ji��)��10.0��ˮ��ȥ��ֵ��,��ԭˮ懝�Ȟ��ֵ5 ��r(sh��),��ʹ�{(di��o)��(ji��)pH ��10.0��ˮ懝��Գ��^(gu��)��ֵ,��

2.2 ��Ͷ��(du��)�̎��Ч��Ӱ�

��l��׃��r��,��懵�ȥ��S��pH ��߶��ߡ��pH ��{(di��o)��Խ��Խ��,��(du��)��ˮ�S��(sh��)�H��r��(l��i)�f(shu��),��pH �{(di��o)��^(gu��)�ߣ��H��Ч��׃��,��Ҍ�(du��)��pH �Ļ��{(di��o)Ҳ�^��y,��ڽ�(j��ng)��(j��)�ͼ��g(sh��)�϶��ǲ��еġ��ˮԴͻ�l(f��)��Ⱦ�¼��,��(y��ng)�C�Ͽ��]pH �ͻ��Ͷ��Ķ��ف�(l��i)�x��ѵ�pH,��ԇ�(y��n)�Y(ji��)��Ļ��A(ch��)�ϣ��x��Ч��^��@��pH(9.0��9.5,��10.0),��{(di��o)��(ji��)�ۺ��Ȼ��XͶ��1.2~3.6 mg/L��(l��i)�_��ԭˮ��懳��^(gu��)��ֵ��ͬ��(sh��)�r(sh��)��Ͷ��,��

2.2.1 pH ��9.0 �r(sh��),��{(di��o)��(ji��)��Ͷ��

�{(di��o)��(ji��)ԭˮpH ��9.0��׃�ۺ��Ȼ��X��Ͷ��,��y(c��)��ˮ��ʣ��懝��,��Y(ji��)��Ҋ(ji��n)�D2��

�D2 pH ��9.0 ��ˮ懝��׃��

Fig.2 Variation curve of nickel concentration in outflow when pH is 9.0

�ĈD2 ��Կ��,��ַ��(y��ng)ǰpH ��9.0,��ˮ懝��S��Ӷ��ͣ�ȥ��S��Ӷ��,��(d��ng)ԭˮ��懝�Ȟ��ֵ��2 ��r(sh��),��Ͷ��1.8 mg/L�ۺ��Ȼ��X��Ԍ��ˮ��懝�Ƚ��ֵ��¡��(d��ng)ԭˮ��懝�Ȟ��ֵ��5 ��r(sh��),��ӻ��Ͷ��(du��)懵�ȥ��߲��@,��Ͷ��3.6 mg/L �ۺ��Ȼ��X��ˮ��懝��0.0448 mg/L,��

2.2.2 pH ��9.5 �r(sh��),��{(di��o)��(ji��)��Ͷ��

�{(di��o)��(ji��)ԭˮpH ��9.5��׃�ۺ��Ȼ��X��Ͷ��,��y(c��)��ˮ��ʣ��懝��,��Y(ji��)��Ҋ(ji��n)�D3��

�D3 pH ��9.5 ��ˮ懝��׃��

Fig.3 Variation curve of nickel concentration in outflow when pH is 9.5

�ĈD3 ��Կ��,��(y��ng)ǰpH ��9.5��ˮ懝��S��Ӷ��,��(d��ng)ԭˮ��懝�Ȟ��ֵ��2 ��r(sh��),��Ͷ��1.8 mg/L �ۺ��Ȼ��X��Ԍ��ˮ��懝�Ƚ��ֵ��¡��(d��ng)ԭˮ��懝�Ȟ��ֵ��5 ��r(sh��),��ӻ��Ͷ��(du��)懵�ȥ��߲��@,��Ͷ��3.6 mg/L �ۺ��Ȼ��X��ˮ��懝��0.02468 mg/L,��

2.2.3 pH ��10.0 �r(sh��),��{(di��o)��(ji��)��Ͷ��

�{(di��o)��(ji��)ԭˮpH ��10.0��׃�ۺ��Ȼ��X��Ͷ��,��y(c��)��ˮ��ʣ��懝��,��Y(ji��)��Ҋ(ji��n)�D4��

�D4 pH ��10.0 ��ˮ懝��׃��

Fig.4 Variation curve of nickel concentration in outflow when pH is 10.0

�ĈD4 ��Կ��(y��ng)ǰpH ��10.0,��(d��ng)ԭˮ��懝�Ȟ��ֵ��5 ��r(sh��),��Ͷ��2.4 mg/L �ۺ��Ȼ��X��Ԍ��ˮ��懝�Ƚ��ֵ��¡�

3 �Y(ji��)Փ

��û��W(xu��)��͏�(qi��ng)��(li��n)�ü��g(sh��)��Чȥ��ˮԴˮ�е��,��{(di��o)��(ji��)ԭˮpH ��9.0,��Ͷ��1.8 mg/L �ۺ��Ȼ��X��Ԍ��ֵ��2 ��ȥ��_(d��)��(bi��o),��Ҫʹ��ֵ��5 ��ȥ��_(d��)��(bi��o),��Ҫ�{(di��o)��(ji��)ԭˮpH ��10.0��Ͷ��2.4 mg/L �ۺ��Ȼ��X,��

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