巴西法布里卡矿采用两段琼斯湿式强磁场磁选机新磁选法处理假象赤铁矿石

法布里卡（Fabrica）矿选矿厂于1977年投产，当时采用9台DP317标准型琼斯（Jones）湿式强磁场磁选机，其间隙宽度为1．5mm，生产球团精矿。这9台磁选机平行作业，给矿速率为110t／h，给矿铁品位约为47％，磁铁矿含量最高只有0．8％。磁场强度约为1．2T。矿山从1986年起开始改革它的生产条件，以便开采和选别大量低品位铁英岩，最有效地利用可采铁矿资源．磁选机给矿中磁铁矿含量增加到3％，其分选能力下降，这是由于在高场强下，分选箱发生部分堵塞，而高场强又是回收极细粒赤铁矿所必需的，即使降低给矿速率和场强也无济于事。利用DP90型琼斯磁选机在半工业厂经过深入试验后，工业生产的湿式强磁场磁选改造为二段分选，但仍采用原有的9台磁选机。第一段分选用4台磁选机，其间隙宽度增大到3．smm，相当于最大磁场强度0．7T．第一段是中等强度粗分选阶段，其后是第二段，即真正的强磁场湿式磁选，采用5台磁选机，按原来配置，间隙宽度为互．smm，最大磁场强度为1．OT。第一段的给矿速率可达320t几，第二段可达240t巾．本文叙述了法布里卡矿选矿厂新、老流程的设计原理，详细介绍了半工业试验和新厂的实际生产数据。

东鞍山贫杂铁矿石选矿技术研究进展

东鞍山铁矿石资源储量丰富,但原矿品位低、组成复杂、嵌布粒度细、磨矿特性差,属典型难选贫杂铁矿石。但现有选矿流程存在的生产工艺复杂、粗细分级和再磨效率低、重选选别效果差、含碳酸盐铁矿石及尾矿固废资源无法高效利用等问题,总结了近年来东鞍山贫杂赤铁矿矿石选矿技术取得的进展,介绍了贫杂赤铁矿石“磨矿—弱磁选强磁选抛尾—搅拌磨磨矿—反浮选”短流程新技术、含碳酸盐铁矿石“悬浮磁化焙烧—磁选”新技术以及浮选尾矿“磁选预富集—悬浮磁化焙烧—磁选”新技术,为东鞍山贫杂铁矿石的高效开发与利用提供了新思路。

四川金锁桥铁金矿床矿石特征

金锁桥铁金矿床位于川滇黔铜多金属成矿带,该成矿带处于环太平洋构造域和特提斯构造域结合部位。矿床的赋矿地层为中元古界青龙山组、淌塘组火山岩。主要构造为近南北及东西向金锁桥断裂。次级褶皱、断裂发育,派生的节理、构造破碎带形成岩浆岩脉及矿脉、矿化的有利空间。矿区出露的岩浆岩有花岗闪长玢岩、花岗斑岩等,这些岩体的空间定位与铁、金矿体密切伴生,有的岩体本身构成矿体的顶底板,为矿体直接围岩,与矿体在成因上存在密切联系。矿化以金、铁为主。矿体主要呈脉状和透镜状分布。

几内亚西南部地区矿床地质特征及成因探讨

<正>几内亚西南部地区地形多为丘陵和低山,西南端邻海,地势南低北高,海拔高度约50~130 m。全区水系发育,规模较大的河流为北东向Darakouli和Kolente,北西向河流多为其支流。植被为次生林,稀疏林和灌木林及其间开阔草地。该区所在地为古侵蚀面,侵蚀面上风化壳发育,基岩露头少见。

Mineral cleavage nature and surface energy: Anisotropic surface broken bonds consideration

The population of surface broken bonds of some typical sulfide, oxide and salt-type minerals which may belong to cubic, tetragonal, hexagonal, or orthorhombic system, were calculated. In terms of the calculation results, the cleavage natures of these minerals were analyzed, and the relationship between surface broken bonds density and surface energy was also established. The results show that the surface broken bonds properties could be used to predict the cleavage nature of most of minerals, and the predicted cleavage planes agree well with those reported in previous literature. Moreover, this work explored a rule that, surface broken bonds density is directly related to surface energy with determination coefficient（R2） of over 0.8, indicating that the former is a dominant factor to determine the latter. Therefore, anisotropic surface broken bonds density can be used to predict the stability of mineral surface and the reactivity of surface atoms.

Enrichment and separation of iron minerals in gibbsitic bauxite residue based on reductive Bayer digestion

The mineralogical characteristics of three kinds of gibbsitic high-iron bauxite and the effects of various digestion conditions on the enrichment and separation of iron minerals were investigated. The results show that adding an appropriate organic reductant such as glycerol can promote the digestion of concomitant diaspore, boehmite and alumogoethite as well as the conversion of goethite to hematite in the reductive Bayer digestion. Processing Bauxite A with A/S of 25.41 can directly produce qualified iron concentrates(TFe>56%) by the reductive Bayer digestion, and thus realize the zero red mud discharge. For Bauxite B and Bauxite C with A/S of 7.82 and 3.35, the iron recoveries of 65.13% and 79.13% can be achieved with the corresponding TFe of 52.05% and 50.16% in the iron concentrates by gravity separation, respectively, resulting in the red mud discharge reduction of ~50% or above.

Mineralogy and textural impact on beneficiation of goethitic ore

The effect of mineralogy and texture on the beneficiation of goethitic ores from two different origins is highlighted. Sample A having 54.47% Fe with 8.57% loss of ignition （LOl） indicates the presence of vitreous and ochreous goethite, martite and microplaty hematite as the major minerals. Sample B contains 56.90% Fe with 14.4% LOI. There is a pisolithic laterite containing vitreous and ochreous goethite, quartz, kaolinitic clay and there is no hematite mineral. The liberated minerals in -150 ＋ 100 μm size class are 74% for Sample A and 37% only for Sample B which shows that the Sample A appears to be more amenable to beneficiate. A concentrate of 46.7% with 63.22% Fe could be recovered from Sample A while subjected to gravity separation followed by wet magnetic separation. The Sample B does not respond to gravity and magnetic separation due to its complex mineralogy. However, calcination of the Sample B followed by magnetic separation gives the encouraging results. Thus, anomalous behaviour of the goethite dominated ores in beneficiation is attributed to the different textural and liberation characteristic.