伟晶岩型锂辉石矿碱溶蚀-浮选试验研究

以伟晶岩型锂辉石矿为研究对象,通过碳酸钠+氢氧化钠碱溶蚀预处理强化锂辉石和长石可浮性差异,筛选出锂辉石高效组合捕收剂氧化石蜡皂+GYHN,通过协同作用,实现了锂辉石的高效回收,最终获得了Li2 O品位5.52％、回收率82.90％的锂精矿.     

锂辉石低温浮选试验研究

针对海拔高、气温低地区锂辉石浮选的影响因素,开发出新型浮选添加剂,不但在常温下可提高锂精矿回收率5％以上,14℃左右的低温范围仍可取得锂精矿品位(Li2O) 6.29％、回收率84.5％开路技术指标.     

某锂辉石矿浮选废水回用的试验研究

为考察某锂辉石矿浮选废水回用至生产流程的可行性及技术方案,对清水和浮选废水进行水质分析,在实验室进行浮选废水回用试验.结果表明,对于浮选尾矿不处理的浮选废水,回用前用硫酸调整pH值至中性范围,一定程度可减轻回水对浮选指标的影响.回水不进行处理,通过调整和优化浮选药剂制度,可提高锂辉石矿的浮选指标,且效果优于调整回水pH...     

机械搅拌预处理强化锂辉石和硅酸盐矿物浮选分离的研究

通过搅拌和浮选试验、电感耦合等离子体光谱(ICP-AES)检测分析,研究了锂辉石和硅酸盐矿物在不同机械搅拌预处理条件下,矿物表面组分溶出行为和浮选行为。结果表明,随着搅拌转速的提高和搅拌时间的延长,锂辉石浮选回收率提高,长石与石英回收率基本不变,人工混合矿浮选分离效率得到显著提高。锂辉石表面Si组分的溶出量>长石>石英,且锂辉石表面Si组分的溶出量大于Li和Al组分。预处理后锂辉石浮选速率常数与其表面Si组分的相对溶出速率成正比,其表面Si组分溶出速率是决定其浮选速率的关键因素。锂辉石矿物表面Si组分大量溶出,导致表面Al和Li组分相对含量增加,促进了油酸根在表面的吸附,提高了锂辉石的浮选回收率。     

锂辉石浮选尾矿中长石和石英浮选分离

对某地锂辉石浮选尾矿进行长石和石英浮选分离试验,探索了无氟有酸法和有氟有酸法2种浮选工艺.氢氟酸法进行了搅拌擦洗时间、氢氟酸用量、十二胺用量和浮选时间等条件试验,在条件试验的基础上,依次进行了长石浮选开路试验和闭路试验.结果表明,通过“1粗2扫1精”闭路流程试验,可获得K2O、Na2O品位分别为4.13%、7.46%,回收率分别为98.03%、98.42%的长石精矿.对产品进行质量检查,长石精矿、石英精矿(长石浮选尾矿)均达到工业要求,实现了锂辉石浮选尾矿综合利用的目的.     

锂辉石选矿技术现状及展望

锂是新世纪的能源金属,而锂辉石是锂的重要来源之一。介绍了锂辉石矿的选矿技术进展,详细阐述了锂辉石的选矿工艺、浮选捕收剂和浮选调整剂的研究现状及发展趋势,并展望了锂辉石选矿技术以后的发展方向。     

新型捕收剂浮选锂辉石的作用机理研究

通过浮选试验、表面张力测试、Zeta电位以及红外光谱分析,考察了油酸钠(NaOL)、脂肪酸甲酯磺酸钠(MES)两种捕收剂及其组合对锂辉石的浮选性能及作用机理。结果表明:单一捕收剂在一定浓度下都能较好的浮选锂辉石,其中MES的捕收性能强于NaOL,组合捕收剂浮选效果明显优于单一捕收剂。捕收剂用量为200 mg/L,NaOL∶MES=5∶1摩尔比组合的浮选效果相对最佳。红外光谱研究表明NaOL在锂辉石表面是以化学吸附为主,MES则是以物理吸附为主,两种捕收剂组合后并没有生成新物质,而是由于锂辉石矿物表面为非均质体,同时不同活性质点间的差异使其具有选择性地吸附在不同位置的矿物表面。     

氦同位素锂辉石标准物质的研制

Two spodumene samples for helium isotope standard were prepared. According to the preparation criterion on first grade national standard materials, homogeneity tests of helium contents and isotope compositions of two samples were carried out using the heat melt method. The homogeneity tests and certification analysis show that 4He contents and 3He/4He ratios of two reference material samples are homogeneous. Afterward two standard samples were distributed to four laboratories for cooperative fixed values. All data of various laboratories submit to normal distribution and not abnormity values. The average values of each laboratory are recommended as values of two spodumene samples for helium isotope standard.     

Effects of holding time on structure and the properties of spodumene/mullite composite ceramics

In this paper, spodumene/mullite ceramics with good thermal shock resistance were prepared from spodumene, quartz, talc, and clay when the sintering temperature was 1270℃. In the sintering process, the effect of holding time on densification, mechanical properties, phase transformation, microstructure, and thermal shock resistance of the composite ceramics were investigated. The phase transition and microstructures of the ceramics were identified via X-ray diffraction (XRD) and scanning electron microscopy (SEM). The interaction between holding time and bulk density was studied by response surface methodology. The result show that an appropriate holding time can improve the mechanical properties of spodumene/mullite ceramics. When the holding time was kept 90 min, the spodumene/mullite ceramics with the apparent porosity was .47%, the bulk density was 2.28 g/cm³, and bending strength was 63.46 MPa. Furthermore, since no cracks formed after 20 thermal shock cycles for the composite ceramics with a bending strength decreasing rate of 12.66%, it is revealed that spodumene/mullite ceramics exhibit good thermal shock resistance. Therefore, this study can provide beneficial guidance for both industrial production and energy conservation.     

Effects of Li Substitution on the Microstructure and Thermal Expansion Behavior of Pollucite Derived from Geopolymer

The purpose of this work was to study the role of lithium in cesium‐based geopolymers and the thermal evolution during heat treatment together with thermal expansion behavior of the resulting geopolymer ceramic. A series of lithium‐substituted cesium‐based geopolymers, Cs_(1?x)Li_xGP (where x = 0, 0.1, 0.2, and 0.3), were prepared. All the geopolymer samples were heated at 1300°C for 2 h and thermal evolution on heating was studied by a variety of techniques. Phase composition, microstructure evolution, and thermal expansion behaviors of the ceramics derived from the geopolymers were characterized. All the geopolymer specimens exhibited similar thermal evolutionary trends. With increases in lithium content, overall mass loss increased gradually due to the higher hydration energy of Li⁺ than Cs⁺. Thermal shrinkage of these specimens can be divided into four stages, i.e., structural resilience, dehydration, dehydroxylation, and sintering, according to the dilatometer results. The introduction of Li results in two‐step sintering behavior for the lithium‐substituted cesium‐based geopolymers. The average thermal expansion coefficient (CTE) of Cs_(1?x)Li_xGP ceramics decreased from 4.80 × 10^?6 K^?1 (x = 0) to 3.61 × 10^?6 K^?1 (x = 0.3) with increase in lithium substitution. The reason can be attributed to the presence of spodumene after thermal treatment, which has a relatively low thermal expansion coefficient compared with pollucite. Meanwhile, molten spodumene could serve as a buffer phase between pollucite crystals also conducive to the decline of CTE of this system.