Determination of Sulfur in Basic Slag

Study on the chemical analysis of basic slag-III

Abstract

This investigation was undertaken to find rapid and accurate chemical methods for the analysis of basic slag. In the report (III), a simple combustion procedure and spectrophotometric methods were described for the determination of sulfur which are contained in basic slag. Combustion procedure: weigh a sample of 0.3-0.6 grams in to combustion boat. The boat is covered and preheated in the combustion tube for at least 2mn. The tube is stoppered and the flow of oxygen (800 to 1000ml. per 2mn.) started through the train. A temperatute of 1350 to 1400°C is maintained in the furnace.
The combustion gases (SO₂, SO₃ etc.) are conducted into the absorbing solution. The absorbent consists of 50ml. of H₂O₂ (0.1%) and 10ml. of CuCl₂ (0.009%). In the absence of F-, sulfur may be determined by titration with 0.01N NaOH. In the presence of F-, sulfurs is determined by titration with 0.04 BaCl₂ using sodium rhodizonate as an indicator.
Spectrophotometric method: 2 gram of sample mixed with 20 gram of Na₂O₂ is fused, the product is extracted with water. Make up to 100ml. with water. Pipet 20ml. of solution Add 30ml. of Fe³⁺-HClO₄ solution. Measure the absorption at 380mμ in 1cm. cell against the blank.