Hur bör ni köra?

kuv., 10 x 14 cm

Har Ni Edra bilringar i ordning?

kuv., 22 x 28 cm

Vi utföra arbetet - Ni njuter av bilfärden

kuv., 13 x 27 cm

Utan att Ni därom anhållit ber jag härmed få meddela att jag denna vår med den från Eder affär köpta "Cleveland" automobilen av sportmodell företagit min första längre färd

11 x 14 cm

Nova - prova en Essex eller Hudson innan Ni bestämmer Eder för bilköp!

kuv., 14 x 8 cm

Tänker Ni sälja Eder bil?

kuv., 22 x 35 cm

Är Ni ägare till en lastbil?

kuv., 14 x 23 cm

Vad Ni bör veta om den nya Ford

kuv., 15 x 21 cm

Ääniä kuilun partaalta

Teema: Opetuksen maantiede - Nuorten maantiede.

Treatment of NI-containing acidic mine waters with calcite side-stones

Acid mine drainage (AMD) presents a serious problem for the environment for the massive formation of acidic leachates containing heavy metals. The present work deals with the AMD treatment using neutralizing limestone side-products. The conventional methods for prevention, mitigating and control of AMD formation are described. The experimental testing of Nordkalk Oy calcite-containing side-stones for acid neutralizing and removal of nickel from solutions presents the research objective. The batch experiments in acid neutralizing with subsequent metal content analysis were carried out. The results showed the dependence of pH on the dose of neutralizing material and the exposure time. The nickel removal, unlike iron, within the pH range from 1.2 to 6.0 appeared to be inadequate. The further research on nickel co-precipitation with iron and aluminium may appear to be necessary together with testing of alkalinity strengthening materials.