Copper smelter slag and copper smelter slag flotation tailings were leached using sulphuric acid solutions, without or with the addition of either ferric sulphate or hydrogen peroxide. Copper extraction from the slag was typically found to be twice as high as that from the slag flotation tailings. Hydrogen peroxide was determined to be the best lixiviant. Thus, copper and iron extractions were ...

Ferrous and ferric sulphates and (oxy)hydroxides can grow on pyrite surfaces and slow oxidation rates. However, in northern climates, repeated freeze/thaw cycles can cause cracks, channeling and exposure of new surfaces. In the present study, weathering in a repeated freeze/thaw experiment was compared to a regular humidity cell experiment. Introductory results (after 17 weeks) show very small ...

--This study is an attempt to stabilize the heavy metals present in the municipal solid waste. A hydrothermal processing system was setup with a mixture of ferric sulphate. Experimental results showed the reduction in the heavy metals concentration in the municipal solid waste ash after the treatment with iron oxides. Initial values of Cg, Cu, Pb, Cr, Hg was 0.001 mg/L , 4.322 mg/L , 0.578 mg/L...

BACKGROUND Blood presence in apical surgery can prevent the correct vision of the surgical field, change the physical properties of filling materials and reduce their sealing ability. OBJECTIVES To describe which are the most effective and safest haemostatic agents to control bleeding in patients undergoing apical surgery. MATERIAL AND METHODS We carried out a systematic review, using Medli...

Polymerised aluminium ferric sulphate (PAFS) was prepared from dross as a coagulant in wastewater treatment. The effects of leaching time, temperature, and sulfuric acid concentrations on the turbidity removal were investigated, optimum conditions determined using response surface methodology. results showed that PAFS preparation at time 60 minutes, temperature 65°C, concentration 1 mol/L. Furt...