钢渣中Fe3O4含量及惰性矿物总量的测定

A Quantitative Analysis Method for Fe3O4and Inert Minerals in Steel Slag

摘要:

准确测定钢渣和分选产品中惰性矿物(金属Fe、RO相和Fe3O4)含量,在分选工艺过程中发挥着重要的作用. 稀硝酸溶解钢渣测定Fe3O4含量残渣中胶体和耐火材料(FR)干扰组分物理分离操作难度大,提出NaOH溶液90℃反应1 h完全溶解胶体得S12. 两种稀HCl溶解法去除S12中Fe3O4拆分测定Fe3O4和FR含量；或测定S12中Fe元素含量以换算因数计算Fe3O4含量. EDTA-TEA(三乙醇胺)-DEA(二乙胺)复合络合剂溶解法测定钢渣惰性矿物含量时C2F残留率高且分离FR困难,EDTA-TEA复合络合剂用NaOH溶液调节pH12.9完全消除C2F,FR与硝酸溶解相同.

Abstract:

Quantitative analysis of inert minerals (Metallic Fe, RO phase and Fe₃O₄) in steel slag and its separated products plays a crucial role in the separation process of steel slag. When steel slag was dissolved in dilute nitric acid solution to quantitate the Fe₃O₄ content, it was difficult to physically separate the interfering components of the amorphous phases and foreign refractory (FR) from the dissolved residue. Therefore, a new solution was proposed, which was to completely dissolve the amorphous phase in NaOH solution at 90℃ for 1 h to obtain the dissolved residue S₁₂ without the amorphous phase. The two dissolution methods with dilute HCl solution were to dissolve Fe₃O₄ from S₁₂ to remove it, and this mineral selective dissolution method was used to test Fe₃O₄ and FR content. Another method was to quantitate the Fe element in S₁₂ and calculated the content of Fe₃O₄ according to the stoichiometric factor. When the method of EDTA-TEA (Triethanolamine) -DEA(Diethylamine) complex solution was used to test the inert mineral content in steel slag, the residual rate of C₂F in the dissolved residue was high, and it was difficult to separate FR from the dissolved residue. NaOH solution was used to adjust the pH of the EDTA-TEA complex solution to 12.9, so that C₂F in the dissolved residue could be completely eliminated, and the FR in the dissolved residue was the same as that obtained by the dissolution method with nitric acid.