兵团人工粒选棉种坚持“五统一”

近日，新疆兵团一师一团认真开展人工粒选棉种工作，为确保棉种纯度春耕春播—播全苗打下良好基础。一团人工粒选棉种工作坚持做到“五统一”。统一时间，各作业站3月23日完成选种工作，农业公司3月24日到3月25日统一验收；统一地点，各单位统一到规定地点挑选棉种，不得私自将棉种带离指定的选种地点；

棉花精量点播人工粒选技术

棉种在机械加工成品过程中，存在一定量的瘪籽、黄籽、破损籽等不合格种子。通过人工粒选，种子发芽率一般在97％以上，能保证精量点播对种子的要求，减少用种，降低成本，保证每穴有苗，实现一播全苗，同时可减少出苗后棉苗个体间的差异，达到苗齐、苗匀、苗壮、苗全，便于管理。经测定，播人工粒选后的棉种，棉田一般增产10％以上。

某多金属选矿厂选锡工艺优化

某矿山锌、铜、锡、铁、硫多金属选矿厂开展锡石选别工艺优化,在优先回收70%的铜金属,90%的锌金属,在除铁硫后,原矿含锡品位为0.21%,铜、锌、铁、硫中锡已经带走20%的前提下,锡指标提升5个百分点,经济效益显著。

KYZE型浮选柱的发展和应用

介绍KYZE型浮选柱的系统组成、充气器特性和适用范围,分析KYZE型浮选柱适合微细粒选别的特点,KYZE浮选柱表观充气速率范围从0.1 m/min扩展到1.8 m/min,满足从氧化矿到硫化矿等不同性质矿物选别的充气量要求。在国内外多个工业项目的应用,表明KYZE型浮选柱具有较好的选别性能。KYZE型浮选柱不仅可以单独使用,也可以和KYZB型浮选柱配套使用,用在浮选流程的精选作业上,对提高选厂的技术经济指标有较大帮助。

疏水团聚-磁种法回收赤泥中微细粒铁矿试验

云南文山铝业所产生的拜耳法赤泥铁品位为21.39%,铁主要以赤褐铁矿形式存在,分布率为76.16%,嵌布粒度微细,采用常规磁选方法难以有效回收。本文拟采用选择性疏水絮凝-磁种磁选方法对赤泥中的铁矿进行回收,选择性疏水团聚可以实现细粒弱磁性矿物选择性絮凝成颗粒较大且磁性较强的絮团,然后通过高梯度强磁选实现赤褐铁矿与脉石矿物分离。在六偏磷酸钠用量为3 kg/t、油酸用量为1.8 kg/t、煤油与油酸的体积比为2.2、聚磁介质直径为1.5 mm、矿浆流速为6 L/min、冲次为300 r/min、磁感应强度为0.85 T的优化条件下,获得的精矿铁品位为40.65%、回收率为50.93%。对在最佳选择性疏水絮凝条件下获得的矿浆,经一粗一精磁选,获得了铁品位为45.13%、回收率为39.77%的精矿。疏水团聚-磁种法作用过程不仅包括各种物理化学作用而且是利用综合力场来处理微细粒弱磁性矿物的新选别技术,其具体作用原理有待进一步的深入研究,试验指标也存在进一步提升的空间。

Collision and attachment behavior between fine cassiterite particles and H_2 bubbles

Particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at different conditions were conducted in a single bubble flotation cell. The recovery of cassiterite was found to be affected by cassiterite particle and bubble size. A matching range, in which the best recovery can be obtained, was found between particle and bubble size. Collision, attachment, and detachment of the particle-bubble were observed and captured by a high-speed camera. Particle-bubble collision and attachment were analyzed with the use of particle-bubble interaction theory to obtain the experimental results. An attachment model was introduced and verified through the photos captured by the high-speed camera. A bridge role was observed between the bubbles and particles. Particle-bubble interaction was found to be affected by bubble size and particle size, which significantly influenced not only the collision and attachment behavior of the particles and bubbles but also the flotation recovery of fine cassiterite particles.

Electro-flotation and collision-attachment mechanism of fine cassiterite

In order to discuss the particle-bubble interaction during the electro-flotation of cassiterite,the recovery of cassiterite with different particle sizes was investigated,and the collision mechanism between the cassiterite particles and H2 bubbles was explored.The flotation tests were carried out in a single bubble flotation cell.The results show that cassiterite particles 10 μm,10-20 μm,20？38 μm and 38-74 μm match with bubbles with size of 50-150 μm,about 250 μm,74 μm and 74 μm,respectively,and a better recovery can be obtained.It is demonstrated that the recovery of cassiterite is influenced by the size of cassiterite particles and bubbles.Furthermore,the probabilities of collision,adhesion,detachment and collection were calculated using the collision,attachment and collection models.Theoretical calculation results show that the collision probability decreases sharply with decreasing particle size and increasing bubble size（below 150 μm）.The attachment probability would increase from the effective collision,leading to the increase of recovery.

Influence of spiral crystal selector on crystal orientation of single crystal superalloy

To increase efficiency and improve performance, reducing cost and emissions, advanced single crystal Ni-based superalloys are required in aerospace propulsion and power generating gas turbines. With the development of alloy, significant improvements in casting techniques have been achieved by introducing the directionally solidified （DS） casting process followed by single crystal （SX） technique. The deviation of preferred orientation of single crystal superalloys is one of the most important defects in casting. In directional solidification equipment with high temperature gradient, single crystal specimens of DZ417G alloy were prepared successfully by the modified Bridgeman method with spiral grain selector. The orientation was investigated by means of X-ray diffraction （XRD） and electron backscattered diffraction （EBSD）.The results show that the crystal selector with a smaller angle can effectively reduce the deviation of preferred orientation.

用先进的重选设备提高细煤选别作业的效能

近期的研究表明,采用先进的重选设备可有效地选别粒度为1mm至37μm的煤。用Falcon重选机进行了较深入的试验,这种设备可在处理能力为75t/h以上的前提下进行选煤。对粒度为1mm至75μm的煤而言,其视在分离密度约为1.60,分离效率相对地高(Ep=0.12),所丢弃物料的灰分及硫含量分别为85%和70%,可燃物的回收率达85%。本文介绍了研究所得的分离工艺指标及分离效率的数据。

在浓缩浮选工艺中利用超细粒浮选精煤制浆

株洲选煤厂采用超细粒浮选精煤制成低灰水煤浆的工艺 ,降低了浮选精煤水分 ,浮选 主选开机比由原来的 1 6左右降低到 1 3左右 ,取得了较好效益。

农户选种留种贮种方法

良种 是增产的重要因素之一 国家种子部门有时因种源及运输条件的限制,不能及时满足需要.对于常规种子,农产可以自己选种留种,不仅可以缓解种源不足的矛盾,而且可以防止品种混杂退化,避免使用假劣种子,提高用种质量和节约购种成本.常用的简易选种、留种、贮藏种子的方法有以下几种.……

Effects of particle size and particle interactions on scheelite flotation

Effects of size distribution (particle size and content of fine fraction (<10μm)) on scheelite flotation were studied using flotation tests and theoretical calculations. The results show that particle size influences the scheelite recovery and the performance of combined reagents. The scheelite recovery is lowered by adding fine particles (<10μm) into the pulp containing coarse particles. Extended DLVO (EDLVO) theory confirms that the fine fractions (<10μm) could interface with the coarse fractions. The interaction energy and fluid forces are relative to the particle size, which might explain why the fine fractions influence the scheelite flotation. The highest recovery of scheelite using combined reagents as collector and optimum ratio of combined reagents were determined by scheelite particle size and reagent performance. However, the optimum adding order was only determined by reagent performance, which has nothing to do with particle size.

麦收莫忘选种

麦收时节是选小麦良种的好时机,选种方法有田间穗选、块选、片选、单株系选和收打后的粒选.

尼雅折桂首个为消费者选酒的大赛桂冠

尼雅葡萄酒再获至高殊荣“最佳中国酒总冠军”。 今年3月，中信国安葡萄酒业旗下产品“尼雅2012年份粒选赤霞珠干红葡萄酒”，获得杰西斯·罗宾逊等国际葡萄酒大师联名推荐的喝彩声历历在耳。时隔三个月，“尼雅2012年份粒选赤霞珠干红葡萄酒”荣膺“最佳中国酒总冠军”的消息在主办方的官方微信上发布，随之迅速扩散至全国葡萄酒界。