“入关”对部分化工矿产品的销售影响与对策(磷、硫、钾部分)

为了适应我国“入关”后国内外市场的形势,对化学矿山行业磷、硫、钾矿的国内外有关资料进行了分析研究。认为我国的磷矿和硫铁矿在国际市场上有相当的竞争力,而出口方向应是我国的周边国家和地区,钾矿将长期依靠进口。     

Moisture adsorption characteristics of a thin bed of polycrystalline potash pellets: Part I. Experimental study

This study is an experimental investigation of heat and moisture transfer within a packed bed of polycrystalline, porous potash pellets. Experiments were first performed to determine the moisture uptake characteristics on individual pellets subject to a step-change in relative humidity. Then a bed of pellets was subjected to flows of humid air on the upper boundary and a cold impermeable surface on the lower boundary resulting in a temperature gradient across the bed. Temperature and moisture content were measured within the bed. It was found that moisture uptake is less for potash pellets and they are less likely to cake than granular and standard potash when subjected to the same ambient air conditions. This is due to the porous nature of the pellet and its nearly uniform size and spherical shape.     

钾长石制取钾肥的研究进展及前景

简要介绍了我国和世界钾盐资源的分布及钾的供需状况,以及缓解我国缺钾局面的主要途径;着重论述了钾长石制钾肥的研究进展;最后阐述了钾长石提钾中存在的问题及发展前景。     

某钾长石矿选矿试验研究

介绍了某钾长石矿石的选矿工艺研究。通过脱泥、强磁选、酸浸 ,将钾长石的铁降到 0 1 9% ,达到了工业利用的要求。     

世界钾资源研究系列之二——国外典型钾盐公司概况

世界钾盐资源分布的严重不均形成了世界钾盐市场的高度垄断局面,简述了全球九大钾盐生产企业情况,主要介绍了世界第一、二、八大钾盐公司—加拿大Potashcorp公司、俄罗斯乌拉尔钾肥公司(Uralkali)、约旦阿拉伯钾盐公司(APC)三家公司的资源概况、采矿、选矿工艺、生产运营等情况,为我国企业更好的了解国外市场,并积极走出去提供信息支持。     

我国钾盐资源的现状和前景

我国钾盐资源紧缺 ,钾肥生产不足 ,要满足我国对钾盐日益增长的要求 ,必须从长远出发 ,拓宽我国找钾新思路 ,扩大找钾范围 ,充分发挥和利用全球钾资源来解决国内钾肥短缺的问题     

表面活性剂与钾长石提钾过程的相容性研究

选择阴离子表面活性剂(十二烷基苯磺酸钠和十二烷基硫酸钠)、阳离子表面活性剂(SC I-A)和非离子表面活性剂(span-60),研究了其单一或混合物对钾长石提钾过程的影响。通过钾溶出率的变化,讨论了不同表面活性剂与钾长石的相容性。实验结果表明:阳离子表面活性剂与钾长石的相容性最好,并以离子对形式吸附于钾长石表面;阴离子表面活性剂与钾长石的相容性较好,其吸附形式可能是范德华吸引力吸附;混合表面活性剂比单一表面活性剂更有利于提高钾溶出率。     

某低品位钾长石矿提纯工艺研究

分析了某低品位钾长石矿的主要矿物成分,K2O+Na2O含量为7.47%。针对该钾长石矿的性质,进行了单一磁选、脱泥-磁选、浮选、脱泥-磁选-浮选四个除铁流程试验,结果表明浮选法除铁效果较佳。试验首先采用阴离子捕收剂十二烷基磺酸钠和石油磺酸钠反浮选除去长石矿中细粒的含铁矿物,再经HF法用十二胺捕收剂对长石-石英进行分离,结果表明,可得产率43.57%、含Fe2O30.25%、K2O13.10%、Na2O0.21%、SiO266.77%的长石精矿和产率41.33%、含Fe2O30.18%、SiO297.66%的石英精矿。      

中国钾盐资源安全简析

我国钾盐资源短缺,是8种(石油、天然气、铜、铝、铁、锰、铬、钾盐)大宗紧缺矿产之一,其中可溶性钾盐资源严重不足。本文在简要介绍全球钾盐资源形势和中国钾盐供需形势的基础上,分析了中国钾盐资源安全存在问题。目前,全球钾盐资源丰富但分布集中,供需分离且形成寡头垄断,而国内钾盐资源供给无法满足国内需求。指出目前国内钾盐资源安全主要存在以下4个问题：钾盐资源对外依存度较高,钾盐资源进口来源集中,国内钾肥供需分离严峻和国内钾肥成本逐渐高企。     

DYNAMIC MODELING AND OPERATION OF A SEEDED BATCH COOLING CRYSTALLIZER

In this study, a dynamic model of a batch cooling crystallizer is developed. The seeded crystallization of potash alum from aqueous solutions. Four different cooling policies namely natural cooling, linear cooling, optimal cooling, and controlled cooling (nonlinear geometric control (NGC) cooling) are presented. The simulation results indicate that both optimal and controlled cooling improve the weight mean size of the final product significantly. The influence of seed loading policy on the end product quality is also studied for the NGC cooling. It is found that the appropriate seed loading is important to achieve a good final CSD, especially for a fixed batch time.