橄榄石类钢渣的蒸压凝性及产物研究

研究了高温高压条件下纯橄榄石钢渣与石英砂橄榄石类钢渣的蒸压胶凝性及其水热反应物，结果表明，水热蒸压反应使纯橄榄石类钢渣显示出胶凝性，石英砂橄榄石类钢渣的蒸压强度可达５０ＭＰａ以上，同时，蒸压反应产物分别以水化钙铁石榴子或石Ｆｅ－ｔｏｂｅｒｍｏｒｉｔｅ为主。     

加重材料粒度对高密度水泥浆性能的影响

根据粒度级配和紧密堆积原理,在室内建立了紧密堆积颗粒级配模型,根据级配模型,利用室内优选出的加重剂赤铁矿和重晶石的不同粒度颗粒进行了级配水泥浆加重实验。以嘉华G级高抗硫油井水泥、赤铁矿、重晶石等为基本原料,通过级配不同颗粒大小的赤铁矿配制密度为2.4g/cm^3水泥浆和同种颗粒大小重晶石和赤铁矿配制密度为2.2g/cm^3-2.3g/cm^3的水泥浆。并对水泥浆密度、稳定性、流动度、流变性、失水、稠化时间、抗压强度等进行测定,找出加重材料粒度级配与高密度水泥浆性能的基本关系。     

钻井液加重剂回收试验研究

废弃钻井液中微细颗粒含量高,泥化现象严重,导致在回收钻井液中的加重剂时普遍存在回收效率低、成本高、易造成环境污染等难题。利用固相间的密度差异,采用旋流器对加重水基钻井液中的重晶石进行分选回收。采用Φ25 mm旋流器对重晶石进行了分选试验,结果表明,在0.5 MPa进料压力下,重晶石回收率达到83.15%,使泥浆加重材料得到有效的回收利用。     

贵州某重晶石选矿试验研究

针对贵州某重晶石原矿品位低、含有碳质的特点,采用"跳汰抛尾-浮选"联合流程对其回收,取得重晶石精矿BaSO4品位93.96%、BaSO4回收率81.66%的较好技术指标。该重晶石精矿可用于钻井泥浆加重剂。     

微锰在高密度水基钻井液中加重性能分析

微锰加重剂作为国外研发的一种新型钻井液加重材料,目前其在高密度水基钻井液中的加重性能有待深入研究。本文综述了国内外微锰在水基钻井液中的加重性能研究的发展现状,调研了加重剂的评价方法以及其对高密度水基钻井液性能影响及其机理分析。通过微锰与API重晶石单独加重以及复配加重,将微锰在高密度水基钻井液中的加重性能研究拓展到密度2.6g/cm~3,从流变性、滤失性、润滑性、沉降稳定性及抗温性综合评价微锰的加重性能。结果表明,微锰加重高密度水基钻井液的流变性、润滑性和沉降稳定性明显优于重晶石体系,而滤失性能较差,不过这点可以通过与重晶石复配得以改善。API重晶石与微锰复配加重体系下(ρ=2.6g/cm~3),复配比例为60∶40时高密度水基钻井液的滤失流变性最优,润滑性和沉降稳定性也较好,钻井液抗温可达160℃。     

六、重晶石

一、用途 重晶石的化学成分为硫酸钡(BaSO_4),是自然界中分布最广的含钡矿物,是钡的主要来源。它在工业生产上的用途主要有三方面:制重晶石粉、锌钡白和钡的化学品。 重晶石粉的最大用途是作为石油钻井泥浆的加重剂。重晶石的比重大(4.3～4.7),     

Cu2+和Mn2+改性铈掺杂铥铁石榴石铁氧体的合成及磁性能研究

铥铁石榴石型铁氧体材料具有优异的电磁性能,在信息通信和电子领域具有潜在的应用价值。采用溶胶-凝胶法,成功制备了Ce_0.1Tm_2.9M_xFe₍(5-x))O₁₂(M=Cu²⁺或Mn²⁺;x=0.15,0.25,0.35)铥铁石榴石铁氧体材料。通过X射线衍射测试分析发现,Cu²⁺或Mn²⁺均被成功合成到铈掺杂Tm₃Fe₅O₁₂(Ce:Tm IG)结构中;同时,拉曼图谱中也印证了掺杂TmIG石榴石铁氧体的特征信号峰。Cu²⁺和Mn²⁺掺杂改性后,其饱和磁化强度Ms均有所增加,推测其与Cu²⁺和Mn²⁺占据八面体位置后,增强了Fe³⁺形成离子之间的强偶和作用的有效磁矩有关,掺杂改性后的铥铁石榴石铁氧体具备了进一步器件化应用的潜...     

微锰加重剂在高密度油基钻井液中的作用评价

随着深水井,大位移井,高温高压井以及窄密度窗口井的钻井作业的进行,对钻井液性能要求越来越高,尤其是对高密度及超高密度下钻井液流变性,造壁性,沉降稳定性以及储层保护性能的要求,常规的API重晶石已经不能满足特殊井钻进的需求。因此,必须寻求新型加重剂来满足日趋发展的钻井工程需求。近年来微细重晶石、微锰、微细钛铁粉等新型加重剂掘起,在现场使用取得较好的效果。本文通过室内试验研究了微锰加重剂在油基钻井液中的加重性能以及对高密度油基钻井液流变性和沉降稳定性的影响,确定了微锰加重剂与API重晶石复配使用的最佳配比。     

一个现代国际流行和在我国尚待开发的宝石品种

萨窝石是近年(1968)发现,90年代流行的一种宝石新品种.我国发现并产有这种宝石,但至今尚未见我国产的萨窝石宝石出现在国内外市场.这是我国有待并应积极开发的当今流行的宝石品种. 萨窝石是Tsavorite、Tsavolite、Tsavolithe的音译名.萨窝石首先发现于肯尼亚Tsavo国家公园附近,故名Tsavorite.1990年台湾国际宝石鉴定研习中心吴舜田先生译为"随我来"也可以说是Tsavorite的音译名,这个名字容易记忆,对商业有利.矿物名称是铬钒钙铝榴石,是石榴石族宝石矿物的一个亚种. 一、萨窝石是石榴石的一个亚种萨窝石是钙铝榴石的一个亚种(见表1).纯钙铝榴石无色,萨窝石含V,主要是含V以及Cr而呈绿色,这和绿柱石因含Cr、V而呈绿色的祖母绿一样.戈尔德施密特(Goldschmidt,1888-1947)最先发现产于挪威的绿色绿柱石含V而且比Cr多,据此得出结论:V在绿柱石中起着Cr的作用,从那时以来在许多矿床中的祖母绿中发现含有V. 二、石榴石族宝石的颜色石榴石除蓝色外,可以有各种颜色,见表2. 呈绿色的石榴石有:萨窝石、水绿榴石、翠榴石、石榴石玉和钙铬榴石.它们都含有Cr、V而致色. 镁铝榴石、锰铝榴石和水绿榴石可以有多种颜色. 三、绿色石榴石亚种 1.翠榴石不仅是绿色石榴石而且是石榴石宝石品种中最珍贵的.自然界稀少价高.     

掺Mn的[YGdCa]3[FeVInMn]5O12复合石榴石

报道了含稀土量少的掺锰复合钇铁石榴石的制备。探讨了替代材料中铁位上锰的掺入对材料特性的影响。结果表明：锰掺入后的材料具有ＹＩＧ相同的结构，并具有良好的施磁性质。该材料适用于制备磁隔离器。     

重晶石粉的表面改性

重晶石粉经表面改性处理后由亲水性转变为憎水性,粉体流动性好,不聚积易分散。改性后的重晶石粉可作为填料代替沉淀硫酸钡在油漆中使用。     

糊精在重晶石和萤石表面吸附特性及作用机理的研究

本工作系统地研究了聚合碳水化合物－糊精在重晶石和萤石表面的吸附特性。发现糊精在矿物表面 的吸附强烈地依赖于矿浆ＰＨ值。糊糊在矿物表面吸附密度最大值为：对于萤石在ＰＨ值大于１２．０，而对于重晶石在ＰＨ为９．７和强酸性范围内。     

Barite in Ceramic Whitewares

An investigation was made of the thermal behavior of natural barite (barium sulfate) and of its effect as a major constituent in whiteware bodies. The maturing characteristics and fired properties of twenty-five barite bodies were compared with those of two conventional semi-vitreous bodies. Barite bodies were found to be particularly promising for the production of semi-vitreous and nonvitreous ware. They exhibited maturing ranges three to eleven times greater than the maturing ranges of conventional semi-vitreous bodies and relatively uniform properties when fired over wide temperature ranges. It appears that an essentially new field of unusual ceramic whitewares has been discovered.     

萤石与重晶石浮选分离的新型抑制剂

ＳＤＦ是由ＮＡＳ和ＨＤＦ按一定比例混合制成的,研究表明ＳＤＦ抑制性能优于ＮＡＳ和ＨＤＦ,是最有效的调整剂,用ＴＦ２－８作捕收剂,ＳＤＦ作调整作,在ｐＨ值５至５条件下可以实现萤石与重晶石选择性分离。     

Improvement of the Flotation Selectivity in a Mechanical Flotation Cell by Ultrasound

In this study, the effect of ultrasound on froth and pulp phases has been investigated in the flotation of two different ore samples, namely barite and chalcopyrite. In order to determine the overall flotation rate constants at various froth depths, incremental recoveries obtained from the flotation tests with and without ultrasound were fitted to a first-order rate equation. Thus, the recoveries of froth and pulp phases were calculated.

The use of ultrasound speeded up the bubble coalescence and therefore reduced the froth phase recovery in the ultrasonic flotation of both barite and chalcopyrite. In addition, the results indicate that there is a considerable effect of ultrasound on the pulp phase recovery in the chalcopyrite flotation whereas no significant differences in the separation performance were obtained from the ultrasonic flotation of barite with and without ultrasound. The results also indicate that a pronounced selectivity effect was obtained from the ultrasonic flotation of both barite and chalcopyrite. The use of ultrasound in the froth remarkably improves the quality of the chalcopyrite concentrate, especially at the shallow froths. Therefore, either effective pulp volume can be increased without sacrificing the separation selectivity or the pulp density can be decreased to obtain better product quality at shallow froths in the ultrasonic flotation of chalcopyrite.     

An integrated radiotracer approach for the laboratory evaluation of scale inhibitors performance in geological environments

The applicability of a newly developed radiotracer technique as a reliable laboratory procedure for the evaluation of scale inhibitors performance to prevent mineral precipitation is demonstrated. The performance of two new environmentally friendly inhibitors to prevent calcite and barite scale was evaluated experimentally in connection with a standard phosphonate-type scale inhibitor using the radioactive tracer technology. The radiotracers ⁴⁷Ca and ¹³¹Ba were employed in order to monitor at real-time calcite and barite scale formation, respectively. The results show that the developed radiotracer technique can be established as a novel method for the determination of the minimum inhibitor concentration (MIC) under dynamic, reservoir conditions. In addition, the radioactive tritiated water (HTO) was used as a reference water tracer to identify the inhibitors’ properties, such as adsorption/desorption characteristics, in sandpack-flooding tests. Further issues regarding the implementation of the radiotracer technology for the laboratory evaluation of scale inhibitors performance are also discussed.     

High temperatures properties of barite concrete with cathode ray tube funnel glass

Heavyweight concrete has been used for different types of radiation shielding applications. Research studies have been performed to determine the mechanical properties of heavyweight concrete. However, relatively little information is available on the fire performance of heavyweight concrete after exposure to elevated temperatures. This study investigates the effects of elevated temperatures (25, 300, 500, 600 and 800 °C) on the residual density, compressive strength and water sorptivity of heavyweight barite concrete. A control mix of normal granite concrete was produced for comparison. The influence of using treated cathode ray tube (CRT) funnel glass cullets as a fine aggregate replacement in the barite concrete was also examined. The results show that the type of aggregate used had a significant influence on the residual properties of concrete mainly because of their physical and mineralogical transformation upon heating. Incorporation of CRT glass in barite concrete seemed to increase the risk of explosive spalling after exposure to 500 °C. However, as the temperature was increased from 600 to 800 °C, the loss of mechanical properties of the concrete containing CRT glass was smaller because of the molten glass being able to fill the pores/cracks, which was followed by resolidification upon cooling. Copyright © 2013 John Wiley & Sons, Ltd.     

云南某萤石与重晶石共生矿选矿工艺

针对萤石重晶石共生矿可浮性相近、浮选分离困难的选矿难题,对云南某萤石重晶石共生矿进行了选矿工艺研究. 结果表明,原矿含重晶石44.38%,萤石20.21%,脉石矿物主要为石英. 经多个实验流程对比后,最终采用萤石和重晶石混合浮选流程,以皂化油酸钠为捕收剂. 采用抑重浮萤的流程,以硫酸铝为重晶石抑制剂,保证萤石可浮性. 经闭路分选流程得到品位96.13%、回收率88.74%的萤石精矿和品位87.65%、回收率97.78%的重晶石精矿.     

The barium sulfate seeding process

The maximum brine temperatures in the final heaters of multistage flash evaporators, being limited by calcium sulfate scaling, in the case of acid decarbonized sea water, might be enhanced by seeding processes. Use of barium sulfate (barite) as seed has recently been proposed in a feasibility study and reported to have the advantage of recycling of a given amount of barite, and the special advantage of inherent diminution of the calcium concentration in the circulating brine. Using the MEWAK I closed loop system, experiments have shown that barite particles remain active as seed when the suspension system is alternatively heated and cooled several times. The “loading” and “unloading” velocity is satisfactory. Further experiments are concerned with the separation of barite from its suspension in sea water brine by hydrocyclones.     

改进型锯齿波跳汰机在重晶石重选中的应用

改进型锯齿波跳汰机对广西象州类比重小,颗粒大,入选品位高的重晶石具有良好的选别效果,研究结果表明,对于原矿品位为７６．２９％,入选粒度〈４５ｍｍ的重晶石矿,经跳汰选别后,可得到品位为９１．８５％的精矿,回收率为９２．３２％。