8—羟基喹啉萃取—氟试剂分光光度法测定氟

以８－羟基喹啉萃取分离干扰离子，用氟度剂－Ｌａ＾３＋显色体系测定氟。对萃取条件及固定剂的选择进行了考查。合成样品回收率９８．９％，样品加标回收率９７．７％，方法简便、准确。     

8-羟基喹啉萃取-氟试剂分光光度法测定氟

以８－羟基喹啉萃取分离干扰离子，用氟试剂－Ｌａ３＋显色体系测定氟。对萃取条件及固定剂的选择进行了考查。合成样品回收率９８．９％，样品加标回收率９７．７％。方法简便、准确。     

火焰原子吸收法测定人发中钙,镁,铜,铁,锌含量

以硝酸－双氧水为混合溶剂，湿法溶解发样，考查了人发中共存离子的干扰情况，并对钙与空气－乙炔火争中电离，提出了抑制的方法。人发５种元素回收率分别为钙１００．７％，镁１０２．０％，铜１０４．０％，铁１０２．０％，锌１０３．０％。     

火焰原子吸收法测定人发中钙、镁、铜、铁、锌含量

以硝酸－双氧水为混合溶剂，湿法溶解发样，考查了人发中共存离子的干扰情况，并对钙在空气－乙炔火焰中电离，提出了抑制的方法。人发５种元素回收率分别为钙１００．７％，镁１０２．０％，铜１０４．０％，铁１０２．０％，锌１０３．０％。     

Co/Al2O3催化剂催化还原NO的活性研究

针对汽车尾气中的NO污染物制得Co／Al2O3催化剂，考查了不同因素对Co／Al2O3催化剂还原NO的影响．用不同方法对该催化剂的活性进行了表征，结果显示该催化剂纯度高，其中Co负载量为2％的催化剂催化活性最好．     

北票煤田掘进工作面突出预测方法研究

本文基于北票矿区井下１８００多米巷道跟踪考查，提出了用三率（预测突出率、预测突出率、预测突出威胁准确率）优选敏感指标及临界值的方法。通过对五种单项和综合指标的比较，选出其中最佳的工作面突出预测综合指标Ｆ，标志突出危险的临界值为Ｆ≥１．７。采用该指标进行工作面预测时，预测突出危险的准确率为６２．３％，预测突出威胁的准确率为９８．２％。     

从锰铁帽中分离锰银的研究（Ⅱ）

提出了用黄铁矿加硫酸处理锰铁帽矿分离锰银的方法，简要介绍了该方法的基本原理，详细考查了影响锰浸出的各种因素，提出了添加铁离子强化高价锰矿浸出的方法。实验表明，该方法可以使锰的浸出率达到９８％以上，渣含锰小于３％，原矿中的银基本上全部保留在浸锰渣中，有效地实现了锰银分离的目的。     

催化分光光度法测定肉制品中的NO^—2及NO^—3

NO2-能催化溶解氧氧化Fe2 为Fe3 .利用生成硫氰酸铁而间接测定NO2－．用锌粉还原NO3-为NO2-．考查了测定条件．NO3-的还原率为99.2％，加标回收率99．％～100.3％，相对标准偏差小于2.1％，摩尔吸收系数7．66×104L-1·mol-1·cm-1.对抚顺食品厂肉制品中含NO2-量的测定做了介绍．     

氢化物—无色散原子荧光法测定莼菜中微量硒

报道了氢化物原子荧光法测定莼菜中微量硒，考查了１３种共存离子的干扰及其消除，比较了６种湿法消解体系对莼菜的消解情况及反应温度的影响，为测定莼菜中微量硒提供了一个满意的方法．本法检出限７．２×１０－３μｇ／ｍＬ，ＲＳＤ不大于０．８６（ｎ＝４），回收率在９９．１％～１０１．４％之间．     

MAOC降凝剂的研究

含蜡原油和柴油低温流动性是迫切需要解决的问题．ＭＡＯＣ降凝剂对大庆原油和鞍山２０重柴油的纯降凝度是１０℃和１３℃．结合热处理加入０．５％～１．０％（Ｗ）ＭＡＯＣ剂，在一定条件下可使大庆原油疑点降低２０～２２℃．同时对ＭＡＯＣ剂的使用条件、影响因素进行了考查．对合成ＭＡＯＣ剂的原料、中间产品和产品进行了分析．推算出ＭＡＯＣ剂的主要结构．     

新桥硫铁矿选硫工业生产实践

阐述了新桥硫铁矿增设的选硫工艺流程,对其技术操作条件进行了考查,硫精矿品位由29%提高到45%,滤饼水份降低至11%,并根据考查结果进行经济效益分析,年可获利润百万元.     

Depressing effect of hydroxamic polyacrylamide on pyrite

The performance of hydroxamic polyacrylamide(HPAM) in mineral flotation was tested on the samples of calcite, diaspore and pyrite. It is found that HPAM expresses intensive depression on pyrite and can be used as effective depressants for pyrite. The depression mechanism of HPAM to pyrite was investigated by the determination of contact angle, zeta potential, adsorptive capacity for collectors and infrared spectrum. A lower contact angle,more negative zeta potential, less xanthate adsorptive capacity, and the formation of chemical bonding were determined, which reveals that the strong chemical interactions exist between HPAM and pyrite surface. The group electronegativity of HPAM was calculated to explain the differences of interaction between reagent and minerals.     

Bioflotation of pyrite with Thiobacillus ferrooxidans

Bioflotation of pyrite with bacteria Thiobacillus ferrooxidans in the presence or absence of potassium ethyl xanthate was studied on a pure pyrite through microflotation and electrophoretic light scattering measurements. The experimental results showed that in the absence of xanthate, pyrite flotation is slightly enhanced by Thiobacillusferrooxidans. However, with xanthate as a collector, pyrite flotation is strongly depressed after being exposed to the bacteria. The longer is the time when the pyrite is exposed to the bacteria, the stronger the depression is. The mechanism of the depression might be due to the formation of the biofilms of Thiobacillus ferrooxidans on pyrite surfaces, preventing the adsorption of xanthate on pyrite surfaces in the form of dixanthogen or xanthate ions.     

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.     

Influences of collector DLZ on chalcopyrite and pyrite flotation

The interaction mechanism of collector DLZ in the flotation process of chalcopyrite and pyrite was investigated through flotation experiments, zeta potential measurements and infrared spectrum analysis. Flotation test results indicate that DLZ is the selective collector of chalcopyrite. Especially, the recovery of chalcopyrite is higher than 90% in neutral and weak alkaline systems, while the recovery of pyrite is less than 10%. When using CaO as pH regulator, at pH=7-11, the floatability of pyrite is depressed and the recovery is less than 5%. Zeta potential analysis shows that the zeta potential of chalcopyrite decreases more obviously than that of pyrite after interaction with DLZ, confirming that collector DLZ shows selectivity to chalcopyrite and pyrite. And FT1R results reveal that the flotation selectivity of collector DLZ is due to chemical absorption onto chalcopyrite surface and only physical absorption onto pyrite surface.     

Action time effect of lime on its depressive ability for pyrite

Two sample groups of bulk concentrates consisting mainly of pyrite and chalcopyrite from Daye and Chenghchao Mines in Hubei Province of China were used to investigate the effect of the action time of lime on its depressive ability for pyrite. The experimental results conducted with different samples and collectors showed that the action time between lime and pyrite markedly influences the depressive ability of lime. The depressive ability of lime increased with the action time increasing. It was also proved that the depressive results obtained at a large lime dosage after a shorter action time are similar to those obtained at a small lime dosage after a longer action time. The increase of depressive ability of lime after a longer action time is because that there are different mechanisms in different action time. The composition on the surface of pyrite acted for different time with lime was studied by using ESCA (Electron Spectroscopic Chemical Analysis). The results showed that iron hydroxide and calcium sulphate formed on the pyrite surface at the presence of lime in the pulp but the amounts of iron hydroxide and calcium sulphate were different at different action time. At the beginning action time the compound formed on the pyrite surface was mainly calcium sulphate and almost no iron hydroxide formed; but with the action time increasing, iron hydroxide formed. The longer the action time, the more iron hydroxide and the less calcium sulphate formed. It was considered that the stronger depressive ability of lime after a longer action time is because more iron hydroxide forms on the pyrite surface.     

Influencing factors of pyrite leaching in germ-free system

The effect of mineral particle size, pulp potential and category of oxidant on pyrite leaching was studied. The results show that a smaller mineral particle size leads to a higher leaching rate of pyrite, and the optimum result with pyrite leaching rate of 2.92% is obtained when mineral particle size is less than 0.037 mm. The pulp potential reflects the leaching process. The increase of pulp potential can improve pyrite leaching. The leaching rate and velocity of pyrite can be enhanced rapidly by adding strong oxidant. The kind and the method of adding oxidant have important effect on the pyrite leaching. Appropriate concentration of Fe3 can enhance pyrite leaching but the precipitation generated by high concentration of ferric ion covers the surface of pyrites and prevents the leaching process. The leaching rate increases with the constant addition of H2O2.     

天然黄铁矿去除废水中Cr^6＋的研究

天然黄铁矿在酸性条件下，具有良好的去除废水中Cr^6＋能力，黄铁矿表现出较强的还原性，能有效还原水溶液中的Cr^6＋而成Cr^3＋，产生铬的硫化物沉淀．黄铁矿用量、pH值、反应时间、温度都影响黄铁矿处理含Cr^6＋废水的效果。     

Bio-leaching effects of Leptospirillum ferriphilum on the surface chemical properties of pyrite

Leptospirillum ferriphilum cultured using different energy sources (either soluble ferrous ion or pyrite) changed the surface properties of pyrite.Cell adsorption,zeta-potential,hydrophobicty,FT-IR spectra and surface morphology were investigated.Adhesion of bacterial cells to the pyrite surface is a fast process.Furthermore,the adsorption of cells grown in pyrite is greater than of cells grown in soluble ferrous ion.The Iso-Electric Point (IEP) of pyrite treated with L.ferriphilum approaches that of the cells thcmselves.The contact angle of the pyrite surface was observed to decrease due to the surface formation of some hydrophilic substances during bio-leaching.Changes in pyrite surface properties after bacterial treatment support the idea that ferric ion plays an important role and that indirect bio-oxidation is the principal mechanism of pyrite bio-leaching.     

Interfacial interaction of bio-leaching of pyrite mineral

Electrokinetic and contact angle measurements were used to discuss the interfacial interaction on bio-leaching of pyrite mineral. Surface energy parameters of pyrite mineral and thiobacillus ferrooxidans were obtained by calculating according to formula of Young's equation and contact angle measurements. The results show that surface energy of thiobacillus ferrooxidans is much higher than that of pyrite mineral, and the reaction of pyrite mineral with thiobacillus ferrooxidans causes the reduction of the pyrite surface energy. The interfacial interaction energies between pyrite mineral and thiobacillus ferrooxidans were also obtained based on polar interfacial interaction theory and electrokinetic and contact angle measurements. The thermodynamics approach only considering Lifshitz-van der Waals and Lewis acid-base interaction fails to explain the adhesion behavior of the bacteria, but the extended Derjaguin-Landan-Verwey-Overbeek theory concerning Lifshitz-van der Waals and Lewis acid-base and the electrostatic can exactly predict interfacial interaction.