Determination of Als,Cu,Mn,P in titanium-iron using ICP-AES

Titanium-iron is an important raw material with high-added value.In order to ensure the quality of steel products,accurate analysis of its impurities is very important.Common analysis using the gravimetric method and spectrophotometry to determine the chemical composition is tedious,long cycle.They no longer meet the needs of they modern mass production.This paper describes the use of plasma emission spectrometry to determine the Als,Cu,Mn,P elements,in ilmeniteing the samples were treated with hydrochloric acid,nitric acid,a small amount of hydrofluoric acid.As the acidity increased,the solution viscosity increased and spectral intensity decreased.By adding sulfuric acid digestion and quantitative means of taking strict control of smoke acidity,smoke makes sulfuric acid take nitrogen oxides and fluorine away,and then add internal standard elements.After series of tests,choose instrument conditions were selected and emission intensities of various elements and internal standard elements were determined,a set of analysis were established(precision of the method RSD is less than 5%).By comparison and analysis it was found that the results were satisfactory.The method provides accurate analysis results featuring high precision and sensitivity,low blank,simple and rapid analysis.It can meet the production needs.Analytical precision of this method is equivalent to wet analysis accuracy,analysis time was reduced to 20%of the original and greatly increased the labor productivity.It was proved that using plasma emission spectroscopy to determine titanium-iron impurity element is suitable.It can replace the traditional spectral photometer test method.

Effect of Sodium Sulfate on Direct Reduction of Beach Titanomagnetite for Separation of Iron and Titanium

The effect of sodium sulfate on direct reduction of beach titanomagnetite,followed by magnetic separation,to separate iron and titanium was investigated. Direct reduced iron（ DRI） with a high Fe content,low TiO_2 content and low iron recovery was obtained after adding sodium sulfate. When the sodium sulfate dosage was increased from 0 to 10 mass%,the Fe content of the DRI increased from 90. 00 mass% to 93. 55 mass% and the TiO_2 content decreased from 1. 27 mass% to 0. 70 mass%. The reduction mechanism of sodium sulfate was investigated by X-ray diffraction（ XRD） and scanning electron microscopy（ SEM） with energy dispersive spectrometer（ EDS）. Results revealed that the metallic iron grains in the reduced ore with sodium sulfate were larger than those in the ore without sodium sulfate. Sodium sulfate promoted the migration of iron as well as the accumulation and growth of metallic iron grains by low-melting-point carnegieite and troilite formed in the redox system. Low-melting-point carnegieite decreased the melting point of the system and then promoted liquefaction. Troilite could decrease the surface tension and melting point of metallic iron grains.