| http://www.w3.org/ns/prov#value | - These sludges consist of semipermanent emulsions formed by the solvent phase,the aqueous phase, and foreign matter such as dirt, sand, silica, organic matter, air, calcium sulfate, lead or aluminum compounds, etc.Mixer-settler solvent extraction units are particularly subject to sludge formation since the aqueous and solvent phases are repeatedly mixed and separated, with gradual accumulation of t
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