巴西磷矿泥浆中磷灰石的回收（英文）

Recovery of Apatite from Slimes of A Brazilian Phosphate Ore

巴西磷酸盐工业一工厂的磷灰石的生产流程一般包括:磨矿;粗细粒分级;磁选(弱磁和强磁);脱泥工艺(除去颗粒小于10μm);重晶石浮选和磷灰石浮选。研究了位于巴西戈亚斯州的Copebras工业磷矿厂的泥浆样品中的磷灰石含量,结果显示原矿中含有13.2%P_2O_5;14%CaO;19.7%SiO_2和27.7%Fe_2O_3,相当于含磷灰石(32%),针铁矿(25%),石英(18%),磷钡铝矿(5.2%).颗粒尺寸分布特征表明:特征直径(D_(32),D_(10),D_(50)和D_(90))分别为2.6μm,1.0μm,5.7μm和25μm。考虑水力旋流器(40 mm)将工艺流程分两个阶段进行脱泥,然后通过浮选柱进行磷灰石浮选,得到含有35.6%P_2O_5和主要杂质为Fe_2O_3(4.0%)和SiO_2(5.1%)的精矿,考虑到脱泥和浮选过程的质量平衡,总体回收率约为11%,P2O5回收率为30%.

In general terms, the flowsheet applied to apatite concentration in Brazilian phosphate industry plants involves grinding; classification in coarse and fines fractions; magnetic separation （low and high intensity）; desliming to remove particles 〈 10 μm; barite flotation and apatite flotation. This work shows the results obtained in a study of apatite concentration from a slime sample provided by the industrial phosphate ore plant of the Copebras （China Molybdenum-CMOC International）, located at Catalo （Goias state, Brazil）. The feed sample containing 13.2% of P2O5; 14.0% of CaO; 19.7% of SiO2 and 27.7% of Fe2O3, which corresponds to 32% of apatite, 25% of goethite, quartz （18%） and gorceixite （5.2%）. Particle size characterization showed that the characteristic diameters （D32, D10, D50 and D90） were respectively 2.6 μm, 1.0 μm, 5.7 μm and 25 μm. Considering the flowsheet with desliming in hydrocyclones （40 mm） in two stages, followed by apatite flotation in columns, it was obtained a final concentrate with 35.6% P2O5 and main impurities Fe2O3and SiO2 around 4.0% and 5.1% respectively. Taking into account the mass and metallurgical balances of the desliming and flotation, the overall mass recovery was around 11% and the P2O5 recovery was 30%.