Experimental research on the dephosphorization of high phosphorus Si-Mn alloy
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摘要: 在硅鉬爐中，1400℃的條件下，利用硅鈣合金、稀土硅、鋁基脫磷劑等對高磷硅錳合金進行還原脫磷實驗研究.脫磷實驗采用CaO-CaF2（質量比為25∶75）為覆蓋渣，渣金比為0.2∶1.采用ICP光譜儀檢測脫磷后合金中的磷含量，X射線衍射檢測渣樣物相成分，著重分析了不同脫磷劑及其用量對高磷硅錳合金還原脫磷的影響.結果表明：隨脫磷劑用量的增加，硅錳合金脫磷率呈上升的趨勢.其中，鋁基脫磷劑脫磷效果最好，當其質量分數達到8%時，合金中磷的質量分數可降至0.21%，符合國標要求（≤ 0.25%），脫磷率達78%；硅鈣合金次之，當其質量分數達到10%時，脫磷率為47%；稀土硅的脫磷效果最差，當其質量分數達10%時，脫磷率僅22%.鋁基脫磷劑為本實驗條件下的最佳脫磷劑.Abstract: There are abundant manganese mineral resources in Chengkou and Xiushang County, Chongqing City, as well as a phosphorus content that is over the national standard; thus, the mass percent of phosphorous in Si-Mn alloys produced from manganese ores is over 1%. This can easily result in "cold brittleness" and reduce the steel quality when the alloys are used for deoxidation and alloying in steelmaking. Therefore, it is important to research on the dephosphorization of Si-Mn alloy. Dephosphorization of a high-phosphorus Si-Mn alloy was studied under dephosphorizing agents of Si-Ca alloy, rare earth silicon, and Al-based dephosphorizer in a silicon molybdenum furnace of 1400℃. In the experiment, CaO-CaF2 (mass ratio of 25:75) was used as a covering slag, and the ratio of slag-metal is 0.2:1. The phosphorous content in the Si-Mn alloy after dephosphorizatoin was detected by an inductively coupled plasma (ICP) spectrometer, and the phase composition of the slag was analyzed by X-ray diffractometry (XRD). The effects of different dephosphorizing agents and their dephosphorization rates were analyzed. The results show that the dephosphorization rate increases with dephosphorizer content. For Al-based dephosphorizer, the dephosphorization effect is optimum at 8% dephosphorizer content, whereby the phosphorus content in the Si-Mn alloy is reduced to 0.21%, which meets the national standard (≤ 0.25%), and the dephosphorization rate reaches 78%. The efficiency of Si-Ca alloy is lower; the dephosphorization rate is 47% even when the alloy content reaches 10%. The effect of rare earth silicon is the least; the dephosphorization rate is 22% when the content reaches 10%. Thus, the Al-based dephosphorizer is the best dephosphorization agent under the present experimental conditions.
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Key words:
- Si-Mn alloy /
- dephosphorization /
- Si-Ca alloy /
- rare earth silicon /
- Al-based dephosphorizer
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參考文獻
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