辉钼精矿熔盐氧化工艺：Na2CO3—Na2MoO4—Na2SO4体系

研究了辉钼精矿在Ｎａ２ＣＯ３－Ｎａ２ＭｏＯ４－Ｎａ２ＳＯ４体系的熔盐氧化过程,探索了不同工艺参数对钼的转化率和脱硫率的影响。结果表明,在熔盐组成为１：１配料双为１：１０,７４０℃,鼓风速度为５．９５Ｌ／ｍｉｎ,鼓风时间为１０ｍｉｎ的条件下,钼的转化率和脱硫率均可达９９％以上。熔炼产物经水浸后,钼精矿中的钼和硫分别以Ｎａ２ＭｏＯ４和Ｎａ２ＳＯ４形态进入溶液,以ＳＯ２形态进入熔炼尾气中的硫不超过总硫量     

杂质含量高的钼精矿生产钼酸氨的新方法

通过对一种杂质含量高的钼精矿生产工业级钼酸氨进行探索试验,找到了一种较为合理、经济的方法,该工艺己在生产中得到了应用     

辉钼精矿熔盐氧化工艺研究——Na2MoO4—Na2SO4体系

对辉钼精矿在Na2MoO4-Na2SO4体系的熔盐氧化过程进行了研究,探索了不同的工艺参数对钼的转化率和脱硫率的影响。研究结果表明,在熔盐组成Na2MoO4与Na2SO4质量比为3：1,配料比为1：10（质量比）,温度为700℃,鼓风速度为1.66m/s,鼓风时间为20min的条件下,脱硫率可达99％以上;得到的熔盐经水浸和碱浸后,钼以Na2MoO4形态进入溶液,钼的总浸出率可达95.5%以上;硫以SO2的形态进入气相,烟气中的SO2体积分数可达5.4%以上,可用于制酸;含钼渣和浸出液蒸发结晶得到的Na2SO4晶体可返回再用;熔盐氧化过程采用连续操作分批加料方式,可提高生产能力。     

金堆城钼矿床中的铅及方铅矿的解离特性

本文研究铅在金城钼矿床的矿石及钼精矿中的赋存状态及相互关系,并阐明方铅矿的解离特征,可为提高精矿质量,采取除铅措施,提供理论依据。     

某钨钼矿的选矿工艺试验研究

某钨矿为含钨矽卡岩型矿石,采用浮选方案,分选回收钼、钨．着重研究了731氧化石蜡皂白钨常温浮选工艺．并获得高质量的钼、钨精矿．钼精矿品位46．12％,回收率76．87％;白钨精矿含W0370．18％,回收率85．31％．     

钼污染饮用水的PAC吸附工艺

目的研究粉末活性炭对生活饮用水中钼污染物的去除效果,通过试验确定最适宜的PAC种类、投加量、吸附时间、pH等工艺参数,为饮用水中钼污染物的去除提供依据．方法以自配的钼质量浓度为1mg／L溶液为原水,模拟钼污染的饮用水,通过试验验证粉末活性炭吸附对钼污染物的去除效果．结果粉末活性炭对钼污染物的吸附在40min内能达到吸附容量的80％～90％;粉末活性炭对钼污染物的吸附等温线符合弗兰德里希（Freundlich）吸附模式,在钼的平衡质量浓度为0．07mg／L时,粉末活性炭对其吸附容量大约为12mg／g．结论比表面积大的木质粉末活性炭适合对钼污染饮用水的处理,溶液的最佳pH值范围为5—8．     

蛋白质增敏钼-邻苯二酚紫体系的研究及应用

在pH=2.8的clark-lubs缓冲介质中,牛血清白蛋白能显著增敏钼-邻苯二酚紫的显色体系,据此建立了分光光度法测定钼的新方法。仔细考察了反应酸度、邻苯二酚紫浓度、牛血清白蛋白浓度及反应时间等因素对测定的影响。最大吸收波长在680 nm处,与钼-邻苯二酚紫体系相比,红移了120 nm。10 mL溶液中,钼质量在0～40μg范围内服从比尔定律,测定的表观摩尔吸光系数为2.11×104L/(mol.cm)。所拟方法简便、快速、灵敏度高,用于合金钢样品中微量钼的测定,结果与认定值一致。     

石墨炉原子吸收光谱法测定硅铁合金中的钼

考查了石墨炉原子吸收测定硅铁合金中钼的最佳灰化、原子化条件,酸介质及共存元素的影响。研究和比较了硝酸镍、氟化钙、氯化钙、氟化铵、酒石酸、ＥＤＴＡ、抗坏血酸对钼测定的增敏作用。以盐酸为介质,氟化钙作基体改进剂的测定体系对抑制干扰,提高分析灵敏度,扩大线性范围具有满意效果。本文还对钼的原子化机理及氟化钙增敏作用作了初步的探讨。     

用磷钼蓝分光光度法测定秀珍菇中总磷含量的探讨

采用磷钼蓝分光光度法,选择700 nm波长,测定秀珍菇中磷的含量。探讨了抗坏血酸和钼酸盐的用量对测定磷的影响,并做了稳定性、精密度、回收率等试验。结果表明,秀珍菇中磷的测定条件为：在室温（20℃~30℃）,显色15 min的条件下,加入质量分数为10%的抗坏血酸1 mL、0.02mol/L钼酸盐2 mL时,吸光度值达到最大。     

催化法合成二烷基二硫代磷酸氧钼

采用HY-6 型酸性离子交换树脂催化剂合成二烷基二硫代磷酸氧钼(MoDDP)。通过对金属的质量分数及收率、反应产物选择性、硫磷酸制备条件等方面的考核, 确定了最佳工艺条件。结果表明, 在混醇与五硫化二磷的摩尔比为3.95∶1 , 控制反应温度为70～ 90 ℃, 反应时间为2 h 的条件下制备硫磷酸。在催化剂存在下, 保持温度为80 ～ 100 ℃, 反应时间4～ 6 h 制备二烷基二硫代磷酸氧钼, 产物中金属钼的质量分数达到10 %以上, 二烷基二硫代磷酸氧钼的收率超过85%。制得的产品经摩擦试验机验证其摩擦性能与传统还原法产品相当。     

四种有机抑制剂对倍半氧化物的抑制性能

采用一粗一精正浮选工艺,研究了小分子有机酸（ST-1）、阴离子淀粉（AS）、萘磺酸盐甲醛缩合物（NFSC）、羧甲基纤维素钠（CMC）4种有机抑制剂对胶磷矿中类型为水云母、褐铁矿的倍半氧化物的抑制性能. 结果表明,NFSC用量为0.35 kg/t时,磷精矿品位达到31.36%,回收率在80.22%,倍半氧化物的质量分数降低到3.48%;CMC用量为0.20 kg/t时,磷精矿中倍半氧化物的质量分数可以降至3.20%,但磷精矿回收率仅为26.24%;当分别使用AS、ST-1作为抑制剂时,精矿中倍半氧化物的质量分数变化都不明显. 因此,NFSC在分离倍半氧化物脉石与磷矿物时抑制性能最好;CMC对倍半氧化物脉石有很强的抑制性,但选择性差;ST-1、AS作为抑制剂对倍伴氧化物的抑制作用较弱. 关键词:正浮选;倍半氧化物;有机抑制剂;抑制性能     

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.     

Investigation into the flotation response of refractory molybdenum ore to depressant mixtures:A case study

In this paper, bulk flotation followed by separation was investigated to concentrate purified molybdenite product from Jinduicheng molybdenum ores(Shanxi province, China). The bench scale tests mainly focussed on separation of molybdenite from other sulfide minerals using the new type of depressants.The effect of each single depressant, including organic depressant-modified dextrin(MD), P-Nokes reagent(PN) and sodium trithiocarbonate(ST), and their mixtures on galena, chalcopyrite and other sulfide ores, was examined in turn by changing the concentrations used in cleaner flotation tests. Closed circuit experiments were carried out under the optimal condition and satisfying recovery and grade of molybdenite concentrate could be achieved(86.294% and 53.157%, respectively). A potential reagent regime was developed, with more environmental friendly and more economical advantages due to the introduction of modified dextrin.     

原油降凝剂混配的降凝效果

讨论了不同酯链长度的降凝剂及将不同酯链长度的降凝剂按不同比例混配后的降凝效果。     

云南会泽高镁中低品位胶磷矿单一反浮选

为了降低云南会泽高镁中低品位磷矿的氧化镁的含量,提高五氧化二磷的品位,采用全硫酸一粗一扫的单一反浮选工艺对云南会泽高镁中低品位磷矿进行了试验.在原矿五氧化二磷的品位为23.71％,最佳磨矿细度为-0.074 mm 88.2％的条件下,以硫酸作为pH调整剂和抑制剂（不需要添加磷酸等其他的抑制剂）,以改性的棉籽油脂肪酸皂为捕收剂,进行浮选试验.结果表明：在粗选硫酸用量为10 kg/t,扫选硫酸用量为6 kg/t,捕收剂TSM-2用量分段加药,第一段粗选添加1.2 kg/t,第二段为0.3 kg/t时,获得精矿五氧化二磷品位为30.09％,回收率达到86.53％,氧化锰由原矿的4.55％降至精矿的0.78％,脱镁率为88.13％的较好指标.为云南会泽磷矿的利用开辟了新途径.     

酸对捕收剂在胶磷矿和白云石表面吸附的影响

浮选过程中抑制剂会使矿物表面亲水,还可能与捕收剂存在竞争吸附. 硫酸和磷酸是钙（镁）质磷矿石反浮选工艺常用的抑制剂. 通过单矿物和人工混合矿浮选试验及吸附量测定,研究了胶磷矿 - 白云石反浮选体系中,抑制剂硫酸或磷酸浓度对捕收剂 GJBW 在矿物表面吸附量的影响. 结果表明,酸浓度对矿物上浮率影响较大,但对捕收剂在胶磷矿和白云石表面吸附量影响均较小,说明该体系中抑制剂和捕收剂在矿物表面不是竞争吸附而是共同吸附,综合决定表面亲/疏水性,进而影响其上浮率. 于是建立了两者在矿物表面共同吸附的双电层模型,其中不溶油酸分子（HOl）作为主要捕收剂组分在白云石 - 水界面起主导作用使表面疏水,而胶磷矿酸溶释放出的或磷酸电离出的 H ₂ PO ₄ ^- 做为主要抑制组分在胶磷矿 - 水界面起主导作用使表面亲水.     

Depressing effect of phenoxyl acetic acids on flotation of minerals containing Ca^2＋/Mg^2＋ gangues

Phenoxyl acetic acids were applied to determine their depressing effect on minerals containing Ca2 /Mg2 gangues. Calcite, mixture of calcite and fluorite, and nickel ore were used in the flotation. And the depression mechanism was studied by the determination of contact angle, zeta potential, adsorptive capacity of collector, and IR analysis as well. It is found that 0.1 mmol/L of phenoxyl acetic acid derived from pyrogallol or gallic acid exhibits strong depressing ability on calcite in almost zero yields at pH value of 9.8, and calcite can be depressed in the flotation of calcite/fluorite mixture for approximate 87% yield of fluorite. The flotation result of practical nickel ore containing serpentine indicates that these two depressants may also show better depression performance to serpentine than traditional depressants such as sodium fluosilicate and carboxylmethyl cellulose. Analysis for the depression mechanism reveals that there exists strong chemical interaction between the depressants and minerals.     

稠油水基降黏剂评价方法研究

含水稠油加入水基降黏剂后常以油水悬浮液或乳状液形式存在,这种不均匀体系给流变性测量带来了困难,搅拌法是解决该问题的常用方法。目前评价水基降黏剂通过测试不同温度下油水悬浮液黏度来评价其效果,该方法不能模拟实际管流剪切对油水悬浮液的影响,其效果过于乐观,本文提出了模拟实际管道降温和剪切的水基降黏剂评价方法,该方法模拟过程与实际管输过程一致,可以对稠油水基降黏剂的降黏效果进行准确评价。     

高凝原油降凝剂的制备

分别采用碳十八直链醇、碳十六支链醇与丙烯酸合成烷基酯,将烷基酯再与顺丁烯二酸酐、苯乙烯聚合制备的三元共聚物,对辽河油田的高凝原油的降凝效果进行了评价,实验发现这两种聚合物对凝固点为30℃原油都具有较好的效果,降幅可达10℃左右,但对凝固点为41℃的原油较差分别为3℃和6℃。具有支链烷基结构的聚合物对原油的感受性较好,最佳降凝浓度小,降幅大。实验还发现,溶剂对石蜡的凝固点降低作用明显,但对高凝原油的凝固点降低作用甚微。     

Evaluation of graphite depressants in a poly-metallic sulfide flotation circuit

Synthetic dyes are commonly used for graphite depression in poly-metallic flotation circuits; however,these dyes can be very expensive. The aim of this study is to evaluate performance of certain low-cost alternative depressants for a complex lead-zinc(Pb-Zn) ore rich in graphite(Gr-C) on a conventional mini pilot-scale flotation circuit. The reagents used were commercial and industrial grade starch; agro-based waste-sugarcane bagasse and charred(burnt) bagasse powder. The primary evaluation criteria were quality(grades) of lead and zinc concentrates, their recoveries(%), and graphite rejection(%) in the tails.Benchmark tests using nigrosine as graphite depressant showed 94.3% rejection of Gr-C. The results with commercial starch were found as effective with 93.8% graphite rejection. Furthermore, bagasse powder showed potential in improving product quality(36.4% and 65.6% Pb grade and recovery) with an intermediate effectiveness in graphite rejection(85.6%). The order of effectiveness in Gr-C rejection follows nigrosine % commercial starch bagasse industrial starch charred bagasse. In addition, the effect these depressants on silver(byproduct) grade and recovery was also investigated.