Effect and mechanism of siderite on reverse anionic flotation of quartz from hematite

Reverse flotation technology is one of the most efficient ways to improve the quality and reduce impurity of iron concentrate. Mineral processors dealing with hematite face a challenge that the flotation results of reverse flotation of hematite are poor in presence of siderite using fatty acid as collector, starch as depressant of iron minerals and calcium ion as activator of quartz at strong alkaline pH. In this work, the effect of siderite on reverse anionic flotation of quartz from hematite was investigated. The effect mechanism of siderite on reverse flotation of hematite was studied by solution chemistry, ultraviolet spectrophotometry(UV) and Fourier transform infrared spectroscopy(FTIR). It was observed that siderite had strong depressive effect on quartz in flotation using sodium oleate as collector, corn starch as depressant of iron minerals and calcium chloride as activator of quartz at strong alkaline pH. The starch was adsorbed onto calcium carbonate by chemical reaction which was formed by CO~(2-)_3 from siderite dissolution and Ca~(2+) from calcium chloride as activator of quartz and precipitated on the surface of quartz, which resulted in improving the hydrophilic ability of quartz.     

低碱度下组合抑制剂对铅铁硫化矿的抑制性能及作用机理

纯矿物试验表明，在碱性条件下DS YD对黄铁矿有抑制作用，而对方铅矿则没有抑制作用；人工混合矿物和实际矿石试验结果证实，用石灰调浆到pH=9，组合抑制剂DS YD能有效实现方铅矿和黄铁矿的浮选分离，精矿含Pb57．89％，铅回收率达到84．78％，并且不影响锌的浮选效果．矿物表面黄药吸附量测定结果表明，组合抑制剂对不同矿物表面竞争吸附能力的差异是低碱度矿浆条件下实现有效分选的主要原因．     

Separation of hematite from banded hematite jasper(BHJ) by magnetic coating

The separation of iron oxide from banded hematite jasper(BHJ) assaying 47.8% Fe, 25.6% Si O2 and 2.30%Al2O3 using selective magnetic coating was studied. Characterization studies of the low grade ore indicate that besides hematite and goethite,jasper, a microcrystalline form of quartzite, is the major impurity associated with this ore. Beneficiation by conventional magnetic separation technique could yield a magnetic concentrate containing 60.8% Fe with 51% Fe recovery. In order to enhance the recovery of the iron oxide minerals, fine magnetite, colloidal magnetite and oleate colloidal magnetite were used as the coating material. When subjected to magnetic separation, the coated ore produces an iron concentrate containing 60.2% Fe with an enhanced recovery of56%. The AFM studies indicate that the coagulation of hematite particles with the oleate colloidal magnetite facilitates the higher recovery of iron particles from the low grade BHJ iron ore under appropriate conditions.     

Magnetic and flotation studies of banded hematite quartzite （BHQ） ore for the production of pellet grade concentrate

To identify and establish beneficiation techniques for banded hematite quartzite (BHQ) iron ore, a comprehensive research on BHQ ore treatment was carried out. The BHQ ore was assayed as 38.9wt% Fe, 42.5wt% SiO2, and 1.0wt% Al2O3. In this ore, hematite and quartz are present as the major mineral phases where goethite, martite, and magnetite are present in small amounts. The liberation of hematite particles can be enhanced to about 82% by reducing the particle size to below 63 μm. The rejection of silica par...     

Application of multi-stage dynamic magnetizing roasting technology on the utilization of cryptocrystalline oolitic hematite: A review

A large number of studies have shown that oolitic hematite is an iron ore that is extremely difficult to utilize because of its fine disseminated particle size, high harmful impurity content and oolitic structure. To recover iron from oolitic hematite, we developed a novel multistage dynamic magnetizing roasting technology. Compared with traditional magnetizing roasting technologies, this novel technology has the following advantages: firstly, the oolitic hematite is dynamically reduced in a multi-stage roasting furnace, which shortens the reduction time and avoids ringing and over-reduction; secondly, the novel dynamic magnetizing roasting technology has strong raw material adaptability, and the size range of raw materials can be as wide as 0–15 mm; thirdly, the roasting furnace adopts a preheating-heating process, and the low-calorific value blast furnace gas can be used as the fuel and reductant, which greatly reduces the cost. The actual industrial production data showed that the energy consumption in the roasting process can be less than 35 kg of standard coal per ton of raw ore. The iron grade of the concentrate and iron recovery reached 65% and 90%, respectively.     

新型捕收剂常温反浮选铁矿石的试验

以司家营铁矿磁选精矿为研究对象,采用新型改性脂肪酸类捕收剂,在浮选温度为25℃下,通过条件试验确定最佳药剂用量(粗选氢氧化钠1 500 g/t,淀粉650 g/t,石灰550 g/t,捕收剂450 g/t;精选石灰200 g/t,捕收剂450 g/t),进行一粗一精开路浮选得到精矿品位66.56%,回收率为70.64%,并经过闭路流程获得精矿品位65.79%,回收率为83.01%,尾矿品位13.58%的选矿指标.试验表明,该新型捕收剂选择性强,常温下水溶性好,解决了常规加温浮选能耗大、成本高的问题.     

Effectiveness of sodium silicate as gangue depressants in iron ore slimes flotation

The recovery of iron from the screw classifier overflow slimes by direct flotation was studied.The relative effectiveness of sodium silicates with different silica-to-soda mole ratios as depressants for silica and silicate bearing minerals was investigated.Silica-to-soda mole ratio and silicate dosage were found to have significant effect on the separation efficiency.The results show that an increase of Fe content in the concentrate is observed with concomitant reduction in SiO2 and Al2O3 levels when a particular type of sodium silicate at a proper dosage is used.The concentrate of 58.89wt％ Fe,4.68wt％ SiO2,and 5.28wt％ Al2O3 with the weight recovery of 38.74％ and the metal recovery of 41.13％ can be obtained from the iron ore slimes with 54.44wt％ Fe,6.72wt％ SiO2,and 6.80wt％ Al2O3,when Na2SiO3 with a silica-to-soda mole ratio of 2.19 is used as a depressant at a feed rate of 0.2 kg/t.     

Effect of bastnaesite as reductant on hematite reduction during in-situ suspension magnetization roasting of refractory iron ore under neutral atmosphere

The iron tailings of Bayan Obo mines are solid waste, which occupies land area and also causes environmental pollution; however, this waste can be recycled. In this study, based on the characteristics of iron minerals and fluorocarbonate contained in Bayan Obo iron tailings, clean magnetization roasting of iron minerals by bastnaesite from iron tailings during in-situ suspension magnetization roasting in a neutral atmosphere was explored. The results show that for iron tailings with a mass of 12 g, a N₂ gas flow rate of 600 mL/min, and roasting for 5 min at 800 °C, iron concentrate with a 60.44% iron grade at an iron recovery of 76.04% could be obtained. X-ray diffraction analysis showed that the weak magnetic hematite was reduced to strong magnetic magnetite in the neutral atmosphere, without additional reductant. The kinetics of the magnetization roasting of mineral mixtures (bastnaesite and hematite) in a neutral atmosphere showed that the optimal reaction mechanism function was the three-dimensional diffusion model with activation energy of 161.8838 kJ·mol^?1; this indicates that the reaction was a heterogeneous, diffusion-controlled solid-state reaction.     

Effect of organic depressant lignosulfonate calcium on separation of chalcopyrite from pyrite

In order to selectively separate chalcopyrite from pyrite, the effect of organic depressant lignosulfonate calcium (LSC) on the flotation separation of chalcopyrite from pyrite was investigated by flotation tests. The depression mechanism was studied by Fourier-transform-infrared (FTIR) analysis. The flotation tests of single mineral show that LSC can depress the flotation of pyrite in a certain pH range, but it has little effect on chalcopyrite flotation. Flotation separation of a mixture of chalcopyrite and pyrite can be completed to obtain a copper concentrate grade up to 24.73% with a recovery of 80.36%. IR analysis shows that LSC and butyl xanthate compete in absorption on pyrite surface, and there exists an LSC characteristic peak on pyrite surface. There is little adsorption of LSC on chalcopyrite.     

钙硅质胶磷矿浮选工艺研究

针对湖北某中低品位钙硅质胶磷矿,分别进行单一反浮选、双反浮选和常温正反浮选工艺研究及药剂费用对比,结果表明：采用单一反浮选,可得到磷精矿P2O530.37%,MgO 0.36%,回收率88.38%的较好指标,且最为经济,每吨原矿药剂费用仅为15.28元;若希望精矿质量更好些,回收率更高些,建议采用双反浮选,可得到磷精矿P2O531.60%,MgO 0.43%,回收率90.63%的好指标,每吨原矿药剂费用为23.40元;正反浮选相对来说精矿质量一般、回收率较低、药剂费用较高、磨矿细度较细,指标分别为磷精矿P2O530.54%,MgO 0.70%,回收率84.62%,每吨原矿药剂费用为26.98元.     

我国钢铁发展对铁矿石选矿科技发展的影响

分析了我国钢铁快速增长情况下国产铁矿石生产和进口铁矿石的比例增长情况。对我国磁铁矿石提铁降硅选矿工艺和阴离子反浮选、强磁选———细筛、磁化焙烧等难选红铁矿选矿关键技术应用现状进行了分析,对选矿设备的发展动态进行了探讨,并展望了闪速磁化焙烧等复杂难选铁矿选矿技术发展前景,提出了急待解决的高效细磨设备、耐磨防堵的细筛网、磁化焙烧新装备、反浮选浮选柱、新型磁化率计、磁铁矿阳离子反浮选药剂的研究等重要问题。     

某铜铁矿选矿工艺研究

主要针对某铜铁矿矿石性质,研究其选矿工艺流程,最终确定选铜回路采用浮选工艺流程,浮选药剂为石灰和丁基黄药;选铁回路采用磁选工艺流程方案。最终铜精矿品位为20.53%、回收率94.50%,铁精矿品位58.54%、回收率72.30%,获得了较好的试验指标。     

萤石-重晶石浮选分离试验研究

通过对某萤石-重品石矿石分离试验研究，发现通过合理药剂配伍．经多次精选可有效分离，获得高质量萤石精矿，满足氟工业的需要，矿浆pH值对浮选分离影响大，水玻璃 焦性没食子酸 硫酸亚铁的药剂组台，对萤石-重晶石分离有良好效果。     

贫磁铁矿反浮选降硅试验

湖北省某地具有较为丰富铁矿资源,矿石中铁含量较低,原矿中全铁(TFe)含量约15%,属于贫磁铁矿,铁矿物的嵌布粒度较细,通过单一弱磁选很难得到全铁品位超过60%的铁精矿,针对该矿弱磁选精矿进行反浮选提铁脱硅研究,一粗一精开路反浮选流程精矿品位可达60%以上,铁回收率60%,产率50%左右.通过小型闭路试验,反浮选最终获得较好指标:精矿产率为68.57%,品位为58.62%,回收率为82.83%.     

贫磁铁矿反浮选降硅试验

湖北省某地具有较为丰富铁矿资源,矿石中铁含量较低,原矿中全铁（TFe）含量约15%,属于贫磁铁矿,铁矿物的嵌布粒度较细,通过单一弱磁选很难得到全铁品位超过60%的铁精矿,针对该矿弱磁选精矿进行反浮选提铁脱硅研究,一粗一精开路反浮选流程精矿品位可达60%以上,铁回收率60%,产率50%左右.通过小型闭路试验,反浮选最终获得较好指标：精矿产率为68.57%,品位为58.62%,回收率为82.83%.     

Prospects of utilization of waste dumped low-grade limestone for iron making: A case study

Low grade dumped limestone sample having high silica of 8.1%, 36.8% CaO, and 3% Al_2O_3 has been studied with the aim to reduce the silica level to below 3% for its utilization in iron making. Beneficiation study of the sample was initiated with desliming of the feed sample of -100 μm to remove the siliceous ultrafine particles and to improve the feed quality. Flotation study was carried out by column flotation technique varying the collector dosage, superficial air flow velocity and froth depth to assess their effect on silica reduction and CaO recovery. It was observed that increased collector dosage and superficial air velocity increases the recovery of CaO, and increase in the froth depth reduces the mass flow and silica content in the concentrate. The best result was found at 1.25 cm/sec superficial air velocity, 25 cm froth depth, 1.25 kgpt collector dosage and concentrate assayed 47.3% CaO, 2.8% silica with 72% CaO recovery.     

球团配加新矿种的应用研究

为了开发新的铁矿资源,对球团配加俄罗斯和伊朗铁精粉进行研究。分析了不同铁精粉的化学成分、粒度组成和矿石颗粒形状,对比了不同原料配比下的造球实验结果和球团质量,藉此选取合适的矿种和配比来替代巴西加斯铁精粉,并进行了工业试验。结果表明,俄罗斯铁精粉造球效果较好,可以替代国内和巴西加斯铁精粉。     

乙二胺活化菱锌矿的浮选试验研究

在哈里蒙德浮选装置上进行了菱锌矿纯矿物浮选试验，讨论了ｐＨ对菱锌矿黄药浮选的影响，证明了乙二胺对菱锌矿具有明显的活化作用，特别是在中性油作辅助捕收剂的情况下，菱锌矿的乙二胺活化，辛基黄药浮选，可以获得理想的指标．     

湖北宜化集团殷家坪磷矿双反浮选工艺的研究

针对湖北宜化殷家坪低品位难选硅镁质磷矿,采用阴离子捕收剂MG-7反浮选脱镁—沉降脱泥—阳离子捕收剂T609反浮选脱硅工艺. 在脱硅之前预先脱泥,同时消泡剂TOP和捕收剂T-609搭配使用,解决了阳离子反浮选脱硅过程中泡沫过稳定的难题. 获得品位为33.04%,回收率为69.50%的浮选精矿. 将分离的矿泥并入精矿,混合后精矿品位为30.56%,回收率为78.68%. 相比于传统的正浮选工艺,此工艺不需加温有效地降低了选矿的成本.     

颗粒尺寸与药剂性质对胶磷矿浮选过程的影响

通过磷矿颗粒的分级浮选、药剂对比及组合浮选对湖北保康钙质磷矿和大峪口硅钙质磷矿进行了系统研究.结果表明:分级后粒径为-65μm的小颗粒磷矿更有利于反浮选,且保康磷矿反浮选效果优于大峪口磷矿;复合药剂和酸性抑制剂均能改善保康钙质磷矿浮选效果,最终磷精矿品位达到36.14%,磷回收率为96.10%;药剂表面张力降低能增强药剂对磷矿颗粒的湿润.最后,通过测量电动电位和亲水亲油平衡值,对浮选过程效率进行了分析,并对浮选机理进行了讨论.