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首页> 外文期刊>Transactions of the Institutions of Mining and Metallurgy, Section C. Mineral Processing and Extractive Metallurgy >Sintering behaviour and sinter properties of phosphorite
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Sintering behaviour and sinter properties of phosphorite

机译：磷矿的烧结行为和烧结性能

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摘要

Phosphorite is the main raw material used in the production of phosphorus in chemical industries. Given the decrease in the supply of high-grade phosphorite lump ore, an agglomeration process must be performed for the phosphorite concentrate after beneficiation. In this study, the mineralogy, granulation and sintering of phosphorite ores from Leshan, China, were investigated. Phosphorite comprises four main phases, namely, fluorapatite, hydroxylapatite, guartz and dolomite. Results showed that an increase in the proportion of nucleation particles in the phosphorite improved the granulation test results, whereas the addition of silica was detrimental to the growth of the granule size and the permeability of the bed. The addition of 3% water to the concentrate that contained approximately 8.3% free water was optimal for the mixture without silica, whereas the addition of 4% water was optimal for the mixture with silica. The yield of strong sinter increased with the increase in carbon dosage up to 7%, but decreased with further increase in carbon dosages. The P_2O_5 content in the sinter also followed the same trend with the yield. The addition of silica was detrimental for both the sinter yield and the grade. Ca_5(PO_4)_3F was identified as the main phase in the sinter. The formation of Ca_2MgSi_2O_7 increased along with the increase in temperature and silica content. The agglomeration mechanism for phosphorite sintering should include 'sintering' and 'pelletising' processes.
机译：磷矿是化学工业中生产磷的主要原料。考虑到高品位磷矿块矿石供应的减少，必须对选矿后的磷矿精矿进行附聚过程。在这项研究中，对中国乐山磷矿的矿物学，成粒和烧结进行了研究。磷矿包括四个主要相，即氟磷灰石，羟基磷灰石，瓜尔兹和白云石。结果表明，增加亚磷酸盐中成核颗粒的比例可以改善造粒试验结果，而二氧化硅的加入不利于颗粒尺寸的增长和床的渗透性。对于不含二氧化硅的混合物，向含有约8.3％游离水的浓缩物中添加3％的水是最理想的，而对于不含二氧化硅的混合物，最理想的是添加4％的水。随着碳含量的增加（最高至7％），高强度烧结矿的产量增加，但随着碳含量的进一步增加，其产量下降。烧结矿中P_2O_5的含量也遵循相同的趋势。二氧化硅的加入对烧结矿的产率和等级都是有害的。 Ca_5（PO_4）_3F被确定为烧结矿的主要相。随着温度和二氧化硅含量的增加，Ca_2MgSi_2O_7的形成增加。磷矿烧结的附聚机制应包括“烧结”和“造粒”过程。

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