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硫化銻精礦還原固硫焙燒直接產出金屬銻研究

Direct production of antimony by reduction and sulfur-fixing roasting from stibinite concentrate

  • 摘要: 針對現行鼓風爐揮發(熔煉)-反射爐還原煉銻工藝存在的流程長、能耗高、低濃度SO2煙氣污染等問題,提出了一種基于選冶聯合過程的銻提取新工藝——硫化銻精礦還原固硫焙燒直產金屬銻.分別以ZnO和碳粉作為固硫劑和還原劑實現對硫化銻礦的固硫還原轉化,直接產出金屬銻,同時生成硫化鋅,再分別分離得到金屬銻粉和硫化鋅精礦.本文采用控制變量法,分別考察了焙燒溫度、碳粉粒度、ZnO配入量、焙燒時間對銻生成率和ZnO固硫率的影響.得到最佳條件如下:焙燒溫度800℃、碳粉粒度100~150目、ZnO量為固硫所需理論量、焙燒時間2 h,在此條件下,銻生成率為90.4%,ZnO固硫率為94.8%,其中溫度和ZnO加入量對焙燒效果有較大影響;同時對反應產物的分析和過程熱力學計算表明焙燒過程分兩步進行,即首先發生Sb2S3與ZnO的交互固硫反應生成Sb2O3,其后在高于700℃溫度下Sb2O3被大量還原成金屬銻.在不同品位的銻精礦綜合實驗中,均獲得了90%左右的銻生成率和88%的固硫率,驗證了工藝的可行性.新工藝低溫低碳、清潔環保,易于開展工業化生產.

     

    Abstract: Blast furnace volatilizing (smelting) and reverberatory furnace process is the main reduction method in the current antimony smelting process, and it is associated with problems such as a long production flow, high energy consumption, and SO2 flue gas pollution. Thus, in this paper, a new process, based on the combination of beneficiation and metallurgy, was proposed for the direct extraction of antimony from stibnite concentrate. Using ZnO and carbon as a sulfur-fixing agent and reductant, respectively, antimony sulfide was transformed to Sb and ZnS metals, and then the mixture was separated by a mineral separation method. The effects of calcination temperature, carbon particle size, ZnO dosage, and calcination time on the conversion rate of Sb and sulfur-fixing rate of ZnO were investigated in detail by controlled variables method. The optimal conditions are as follows:calcination temperature 800℃, carbon particle size 100~150 mesh, ZnO dosage 1.0 times the theoretical amount, and roasting time 2 h. Under these conditions, the antimony generation rate and sulfur-fixing rate of ZnO are 90.4% and 94.8%, respectively. The antimony generation rate and sulfur-fixing rate of ZnO can be improved by increasing the reaction temperature and ZnO dosage. Meanwhile, the phase analysis results of the reaction products and thermodynamic calculations of reactions indicate that the reaction paths of Sb2S3 and ZnO comprise two steps:First, Sb2S3 reacts with ZnO to generate Sb2O3, and then after 700℃, it is reduced to a large amount of antimony. In the comprehensive experiments of different grades of antimony, about 90% of antimony generation rate and 88% of sulfur-fixing rate are realized, which demonstrates the feasibility of the new process. The new process is characterized by low temperature and low carbon usage, and it is clean and environment friendly; thus, it is suitable for industrial production.

     

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