昆阳磷矿磷块岩中铬元素的赋存状态分析

铬元素的化学性质、磷块岩的矿物组成及磷块岩破磨后不同粒级元素、矿物的分布特征与铬元素的相关性分析结果表明,昆阳磷矿磷块岩中铬元素赋存在陆源碎屑矿物白云母及白云母风化形成的伊利石、高岭石矿物中。     

磷块岩中稀土元素赋存状态研究

元素的赋存状态主要有3种形式:独立矿物、类质同象和吸附状态。针对贵州织金地区的磷块岩,通过数理统计分析和化学分析,研究证明了其中稀土元素的赋存状态。即磷块岩中稀土与磷呈正相关,其相关系数为0.982 86,稀土元素部分置换了胶磷矿中的Ca~(2+)后,以类质同象的形式赋存于胶磷矿中;稀土元素以吸附形式存在于粘土矿物或其他矿物中的质量分数很可能在2%~3%之间;数理统计结果证明磷块岩中稀土形成独立矿物的可能性很小。这将为进一步开发利用磷块岩中的稀土资源提供理论指导。     

西南滇黔风化磷块岩研究现状与趋势

中国西南滇黔磷矿资源丰富,风化现象普遍。本文在汇总前人对风化磷块岩的研究成果的同时,预测了风化磷矿的新的研究趋势。     

风化煤在磷矿酸解体系中的吸附特性研究

研究了风化煤对磷矿酸解反应体系中Ca2 、Fe3 、Al3 及H2PO4-的吸附特性.实验表明:风化煤吸附上述4种离子从易到难的顺序及最大吸附量从大到小的顺序均为:Fe3 、Ca2 、Al3 、H2PO4-;吸附等温方程均符合Langmuir方程,且相关性显著.为探讨风化煤对磷矿转化率的影响和生产生态型磷肥提供了理论基础.     

保康白竹磷矿选矿方案的探讨

保康磷矿是我国八大磷矿基地之一,而白竹磷矿又是保康矿区中储量最大而且进行了详探的矿区,开发的条件最为优越,为此对白竹磷矿进行了多种选矿方法的研究。 一、矿石性质 白竹磷矿层产于震旦系上统陡山沱组下段,为一浅海地台相磷块岩矿床。该磷矿石以白云质条带状磷块岩为主,其次为泥质条带状磷块岩、薄层状磷块岩、云质蠕虫状磷块岩和致密块状磷块岩。主要有用矿物为胶磷矿和磷灰石,主要脉石矿物为白云石,石英和粘土。磷大部富集在磷质条带中。三、四矿段储量占绝大部分,多元素分析如下:     

某低镁风化胶磷矿工艺矿物学研究

通过云南某低镁风化胶磷矿的工艺矿物学研究,查明矿物组成、主要矿物的嵌布特征以及磷元素的赋存状态。结果表明,该矿物中主要含氟磷灰石、风化胶磷矿、石英、正长石、白云石、白云母等。该矿中磷元素占总质量的9.44%,主要含磷矿物为氟磷灰石、风化胶磷矿,磷赋存在氟磷灰石分配率为83.55%,在风化胶磷矿中的分配率16.45%;主要脉石矿物为石英。     

贵州开阳陡山沱组超大型磷矿的富磷因素分析

开阳磷矿高品位[w(P2O5)30%]磷矿资源达到16亿t,是世界上磷矿石最富的超大型磷矿床。通过岩相古地理、藻类微生物成矿作用和后期富磷作用研究,认为形成开阳陡山沱组高品位超大型磷矿的主要控制因素为:a.具有独特的古地理格架——长舌状海湾;b.菌藻类微生物的发育在高品位"壳粒磷块岩"形成中起重要作用;c.磷块岩形成过程中,存在多期暴露,由于风化淋漓作用使磷质再富集。     

贵州某磷块岩的风化反应与酸解活性关系研究

通过对贵州某磷块岩的矿物组成成分及含量以及风化水解反应进行分析,说明风化反应与磷块岩的化学组成及微观结构有着密切的联系。磷块岩中碳酸盐的含量及其在磷块岩晶体中的赋存状态对磷块岩的酸解反应活性有着较大的影响。根据磷块岩酸解反应活性与磷块岩晶体微观结构的关系,最后得出易风化的磷块岩具有较好的酸解反应活性。     

论晋宁磷矿的选矿方案

<正> 晋宁磷矿属大型浅海相沉积层状磷块岩矿床。矿层结构单一,无夹层。贫富矿之间无明显界线。品级逐渐过渡,五氧化二磷含量由上至下逐渐降低,杂质含量由上至下逐渐升高。矿石为低镁风化磷矿,氧化镁含量<1％,铁、铝氧化物的含量变化较大,在2.5～6.8％之间。露采境界内的储量中富矿占52.64％,     

安宁县街磷矿床中低品位矿石地质特征及产出状态

安宁市县街磷矿床属古生代下寒武统梅树村组大型浅海相层状磷块岩矿床。磷矿层有上、下两层,分别产于梅树村组中谊村段的1m1-3和1m1-1两个层位。中低品位磷矿石产于下矿层,主要由磷酸盐矿物和脉石矿物两部分组成,含较多碎屑成分,矿石品位10%～20%。磷酸盐矿物以胶磷矿为主,主要呈球粒或集合体球粒产出,以及在基质中呈胶结物。矿石类型主要为白云质球粒磷块岩、碎屑状砂屑磷块岩。矿石结构、构造主要为内碎屑结构、条带状构造。矿层相对稳定,但P2O5含量与矿石结构构造关系密切,品位变化明显。     

硅质磷块岩去除水溶液中铅离子的研究

硅质磷块岩可以有效地降低水溶液中铅离子的浓度,其反应机理属于一种广义的吸附作用。当反应条件一定时,硅质磷块岩具有稳定的铅离子吸附量,而且其吸附量可以通过超细粉碎或改性活化作用得到显著提高。     

云南磷矿选矿产业化开发利用及发展历程

云南是我国的富磷省份之一,绝大部分磷矿石适于露天开采。先期开采的浅表风化中高品位磷矿石,P2O5品位高、MgO含量低、倍半氧化物高,以1989年云南磷化集团海口磷矿30万t/a擦洗厂的建成投用为标志,采用擦洗分级脱泥的方法,脱除部分泥质,提高矿石品质,使中高品位磷矿石得到了有效利用。随着开采埋藏的加深和风化富矿的不断减少,开采的大量中低品位半风化、原生矿石,以云南磷化集团有限公司研究开发的中低品位磷矿浮选产业化技术为支撑,2007年云南磷化集团海口200万t/a浮选厂的建成投用为标志,采用浮选法,脱除有害杂质,提高矿石品质,使中低品位磷矿石得到了有效利用。云南胶磷矿的选矿产业化开发利用,有力地支撑了云南磷化工支柱产业的可持续发展。     

云南浮选风化磷矿生产湿法磷酸起泡原因研究

风化磷矿是碳酸盐类磷矿经风化作用形成的一种高质量矿石,是一种新的磷矿石工业类型。二水湿法磷酸生产企业采用浮选风化磷矿作为生产原料时萃取槽会出现大量稳定性泡沫。经过实验,证明起泡的主要原因来自于风化磷矿浮选药剂,而非风化矿自身的物理性质。解决起泡的关键在于调整浮选药剂配方,即使用高效低泡浮选药剂以及在萃取工序增加必要的消泡措施。     

Removal of Cadmium and Chromium Ions Using Modified α, β, and γ-Cyclodextrin Polymers

The adsorption of cadmium and chromium from aqueous solutions with epichlorohydrin cross-linked α, β, and γ-cyclodextrin polymers (CDPs) was investigated under a wide range of experimental conditions including pH, metal concentration, and CDP amounts. Recent studies have shown that α, β, and γ-CDPs follow the Freundlich, Langmuir, and Brunauer–Emmett–Teller models and are capable of reducing heavy metal ion concentrations in water to desirable levels with enhanced sorption capabilities. The removal of cadmium and chromium achieved equilibrium in 4 h. The pH of effective cadmium removal was 6.5 to 7.5, and phosphate buffer favored the removal of cadmium in the presence of potassium ion. Chromium removal was optimal at pH 3.6 to 6.5. Current technologies can remove 99% cadmium ions from solution, yet this process is not very efficient for chromium ions. Furthermore, a small amount of CDPs can remove large quantities of heavy metal ions and can then be regenerated with acid for reuse. The present results are promising for using inexpensive CDPs as a low-cost material that is effective in remediating waters contaminated with heavy metal species. The sorption kinetics of CDPs along with the conditions to adsorb cadmium and chromium are reported here for the first time.     

Coupling of electrodialysis and leaching processes for removing of cadmium from phosphate ore

Phosphate rock is a valuable material that is used for the production of large phosphorus chemicals. However, this natural material usually contains some toxic elements such as cadmium (Cd). Cd is a non-nutritive metal regarded as harmful to both humans and the environment. The main toxic effects of Cd on human health are the kidney and renal cortex diseases. Other effects were observed on pulmonary, cardiovascular, and musculoskeletal systems, in addition to including Cd as a human carcinogen. In order to reduce the cadmium content in the phosphate ore, an original method was studied and consists of coupling both leaching and electrodialysis. The effects of process parameters, such as reaction time, nature, and concentration of the extracting agent, liquid/phosphate ore ratio, pH, temperature, and current density, were investigated. The obtained results show that the cadmium extraction from phosphate ore using simple batch leaching does not reduce the cadmium content to the required level. However, the application of leaching- electrodialysis coupled method at optimum current density of 10 mA cm^?2 increases the cadmium extraction efficiency up to 84.3%. This synergetic process could be applied to the treatment of phosphate ore containing cadmium.     

常压微波消解-原子吸收光谱法测定磷矿中铅、镉、汞

采用常压微波消解法前处理磷矿样品,使用GGX-9型原子吸收光谱仪测定磷矿中铅、镉、汞含量,铅、镉、汞检出限分别为0.009 3、0.012 0、0.011 0μg/g,加标回收率分别为100.06%～100.18%、99.73%～100.18%、99.51%～100.63%,3种元素的相对标准偏差均在1%左右。     

Biosorption of heavy metals by Saccharomyces cerevisiae: Effects of nutrient conditions

Studies took place to investigate the effects of different nutrient conditions on the biosorption ability and selectivity of heavy metals by Saccharomyces cerevisiae. After having grown in media supplemented with additional glucose, ammonium, phosphate or cysteine, the yeast was exposed to an equimolar solution of lead, cadmium, zinc and copper. Lead removal from a mixed solution was significantly higher than that of copper, followed by zinc and cadmium. Generally, yeasts from cysteine-rich media showed greatest sorption capacity whereas phosphate addition influenced zinc selectivity. In addition, glucose, fructose and sucrose as carbon sources were examined. Cultures grown in glucose had a better uptake than those cultivated with fructose at an incubation time of 30 min.     

Flotation of a carbonate rich sedimentary phosphate rock

A large portion of the world's phosphate reserves are sedimentary type containing appreciable amounts of carbonate minerals. These are the most difficult type of deposits to beneficiate. The depletion of other reserves easier to beneficiate, necessitates research to find methods of mineral processing for carbonate rich sedimentary phosphate deposits. In this study, a new flotation method is described which was applied successfully in a laboratory scale flotation cell. Flotation of Al-Jalamid phosphate rock (sedimentary type with high carbonates and low silica content) found in northern Saudi Arabia was studied using a fatty acid as collector and sodium sulfate as a flotation aid.     

Use of sea water in the flotation of carbonate rich sedimentary phosphate rock

There is an appreciable amount of carbonaceous sedimentary phosphate deposits in the northern Africa and the Middle East which are expected to gain importance in the near future because of the depletion of the deposits in Florida. In many of the regions where phosphate deposits are found there is a shortage of fresh water, and sea is not very far. The use of sea water instead of fresh water in flotation of carbonaceous phosphate rock is successfully demonstrated. Thus an appreciable reduction in the operating cost and an ample amount of saving in the fresh water resources of the region is expected.     

云南某中低品位风化磷矿选矿实验研究

云南某中低品位磷矿,含镁低、硅高,风化程度较深。采用捕收性能强,选择性能高的磷矿正浮选脱硅常温捕收剂HH进行试验研究。结果表明:在采用一粗一扫正浮选闭路工艺流程,在磨矿细度小于74μm粒级质量分数为90%,抑制剂水玻璃用量为9.0 kg/t,捕收剂用量为1.7 kg/t的条件下,可获得磷精矿P_2O_5品位为29.26%,MgO质量分数为0.83%,精矿产率为65.62%,P_2O_5回收率为89.05%的浮选试验指标。