Mixing different density liquids esp. sulphuric acid and water - with constant measurement of density by air pipes at different levels

摘要

Mixing liquids of different densities in a tank, where the mixing operation itself generates heat, consists of measuring the density continuously as the liquids are introduced into the tank. The measurement of density is carried out by a differential pressure measurement using two bubble pipes discharging at different levels into the tank. In the later part of the operation, the mixing takes place at a constant elevated temp. resulting from the heat generation in he mixture. Used for mixing concd. sulphuric acid either with water or with dilute sulphuric acid resulting from the washing of electrodes, partic. in the mixing of the acid for prodn. of lead-acid accumulators. The method enables an accurate determination of the final density, and thus of the proportions of the mixture to be obtd. regardless of the purity or acid concn. in the initial mixing water.