阴极溶出伏安法测定黄原酸盐

提出了一种测定微量有机硫化合物的方法一阴极溶出伏安法测定黄原酸盐，研究了它的溶出伏安性质和测试条件，此化合物在酸性溶液中，在电位-0．45V附近出现溶出峰。溶出峰高度与浓度在10^-6-10^-8mol／L范围内具有良好的线性关系。     

去除水中黄药的试验研究

为给选矿废水中残余黄药的去除提供依据，分别采用自然曝晒法、漂白粉氧化法、酸化分解法、亚铁沉淀法、活性炭吸附法对配制的黄药水溶液进行了黄药降解试验，结果表明，以上诸方法均能较彻底地去除溶液中的黄药，使水中的黄原酸盐浓度达到国家排放标准。其中亚铁沉淀法、漂白粉氧化法药剂来源容易，价格便宜，工艺简单，效果好，较适合处理含黄药选矿废水。     

对浮选过程中黄药浓度变化规律的研究

研制了由离子选择性电极（ISE）、XDI智能检测仪等组成的黄药浓度检测系统。时检测系统的性能作了较详细的研究；对浮选过程中黄药浓度进行了在线检测,研制系统检测结果与紫外分光光度法对照取得了较好的一致性,误差小于5％；探讨性研究了选矿过程中黄药浓度的变化规律。     

Application of orange peel xanthate for the adsorption of Pb from aqueous solutions

Pristine orange peel was chemically modified by introducing sulfur groups with the carbon disulfide treatment in alkaline medium. The presence of sulfur groups on orange peel xanthate were identified by FTIR spectroscopic study. Equilibrium isotherms and kinetics were obtained and the effect of various parameters including equilibrium pH, contact time, temperature and initial ion concentration on adsorption of Pb²⁺ were studied by batch experiments. The maximum adsorption capacity of orange peel xanthate was 204.50 mg g⁻¹, which was found to increase by about 150% compared to that of pristine orange peel. The adsorption process can attain equilibrium within 20 min, and kinetics was found to be best-fit pseudo-second-order equation. Temperature has little effect on the adsorption capacity of orange peel xanthate. In addition, the adsorption mechanism was suggested to be complexation.     

The role of calcium in xanthate adsorption onto sphalerite

This paper presents results of a laboratory study designed to look into the effect of calcium on sphalerite hydrophobization with xanthate making use of zeta potential, contact angle, microflotation and UV/vis spectrometry techniques. The experimental results show that xanthate adsorbs onto the mineral surface at neutral and slightly acid pH as reflected by contact angle, floatability (by microflotation) and xanthate adsorption (by UV/vis spectrometry) measurements. Apparently, xanthate adsorption is due to both the less negative surface charge of the mineral and to the presence of Zn²⁺ in equilibrium with the mineral, rather than Zn(OH)₂, which is the product of the mineral oxidation with dissolved oxygen at pH above 8. When calcium is present in the aqueous solution at concentrations similar to that of saturation for gypsum precipitation (e.g., about 0.017 mol/L), calcium apparently adsorbs on the sphalerite surface decreasing its negative charge (e.g., zeta potential) and promoting xanthate adsorption and hydrophobization, as reflected by contact angle and floatability measurements (ca. 30° and 33% recovery, respectively). Calcium adsorption appears to be favoured by the increase in pH, as reflected by the increased xanthate adsorption, thus suggesting that the calcium hydroxo-complex (CaOH⁺) is the adsorbing species. At pH 10 and 11, precipitation of calcium hydroxide (observed by SEM-EDS measurements at pH 11) appears to counteract xanthate adsorption, substantially decreasing mineral hydrophobicity. Calcium and xanthate appear to display some type of chemical interaction while calcium and dithiophosphinate do not.     

提高黄药质量方法的探讨

本文通过对黄药生产过程中各要素相互关系的分析和探讨 ,介绍了提高黄药质量的方法。     

黄原酸盐与氨荒酸混合物的高效液相色谱分析

提出了高效液相色谱定性定量分析黄原酸盐与氨荒酸混合物组成的方法。混合物经碘氧化后生成对称和非对称化合物 ,用正己烷萃入有机相 ,在RP1 8柱上以甲醇 -水 (85∶1 5,V/V)为流动相 ,2 4 0nm处检测 ,其校准曲线的线性范围为 6.2× 1 0 - 5～ 2.0× 1 0 - 3mol/L ,7次测定RSD <2 %。     

氧化锌纳米线阵列光催化降解异丁基钠黄药

为探索高效降解选矿废水中残留的常用浮选药剂异丁基钠黄药,以锌片为基底,采用水热法制备了一种可循环利用的新型光催化降解材料——氧化锌纳米线阵列,通过XRD、SEM、TEM、PL和DRS等手段对所制备样品进行了晶相、形貌及光学性能表征,并研究了异丁基钠黄药初始浓度、模拟废水pH和光催化降解时间等对材料光催化活性的影响。结果表明:当异丁基钠黄药初始浓度为60 mg/L、模拟废水pH=7、氧化锌纳米线阵列(锌片规格为2cm×2 cm×0.8 mm)催化降解时间为60 min时,异丁基钠黄药的降解率为91.46%;氧化锌纳米线阵列循环利用10次仍保持良好的光催化活性。动力学研究表明,氧化锌纳米线阵列光催化降解异丁基黄药的行为符合一级反应动力学模型。     

天然水中黄原酸盐的分解条件试验

借助正交试验法对影响黄原酸盐分解的诸因素（酸碱度、温度、光照、时间等）作了研究,并对含有黄原酸盐的废水的净化处理提出了建议。     

Surface characterisation,collector adsorption and flotation response of enargite in a redox potential controlled environment

We previously investigated oxidation of the surface of natural enargite (Cu₃AsS₄) under potentiostatic control and the formation of oxidation species at the mineral surface at selected applied potentials in the oxidative range. Here we further extended the research by incorporating flotation collectors into the system. Electrochemical techniques, X-ray photoelectron spectroscopy (XPS) and microflotation in a redox potential controlled environment were applied to examine surface properties, collector adsorption and flotation response of enargite in pH 10 solutions of sodium ethyl xanthate (SEX) and sodium dialkyl dithiophosphinate (3418A). The spectral details of XPS analysis of electrochemically treated enargite surfaces show significant adsorption of SEX and 3418A collectors onto enargite at an applied voltage of +516 mV, but no adsorption of both collectors at −400 mV. The results of XPS analysis agree with the floatability of enargite determined by microflotation, showing that the flotation recovery was highest at high oxidative potential (+516 mV), then decreased at low oxidative potential (+100 mV) and was very poor at −400 mV. These results confirm that enargite floatability can be efficiently controlled electrochemically.