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老挝钾盐矿资源规模化开发的总体思路 总被引:1,自引:0,他引:1
老挝钾盐矿资源开发已成为我国钾肥开发战略的重要组成部分,从国家中长期经济发展的要求以及东南亚、南亚区域经济快速发展的前景分析,开发老挝钾盐资源对推进中国与周边国家战略合作以及推动世界经济均衡发展均具有重大战略意义。 相似文献
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全球钾盐资源储量丰富但分布极不均衡,绝大部分钾盐资源集中在加拿大、俄罗斯等国。拉美地区已发现钾盐资源,多数为含钾卤水,少部分为地下固体钾盐,发现拥有钾盐资源的国家有巴西、阿根廷、玻利维亚、智利和秘鲁等国。通过对拉美地区钾盐资源分布及开发利用现状进行分析,总结了中国企业开展境外钾盐开发合作中的困境,并对拉美各国开展钾盐矿产资源勘查开发的可进入性及优先进入目的国进行了评价与讨论,这为中国地勘单位和企业到拉美进行钾盐勘查、开发投资提供科学指导。 相似文献
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概括全球钾盐探明资源储量及其分布特点,钾肥生产、供给与消费情况。分析我国钾盐资源特点及钾肥产业发展,钾盐资源总量少,需求量大,但我国钾盐以盐湖卤水为主,是"活矿",能够持续保障自给率50%。未来全球钾肥市场将持续保持稳定增长,前景乐观,但钾肥产能过剩将长期存在,寡头垄断局面受资源禀赋决定无法改变。全球钾肥绿地项目难以发挥效益,必须高度重视产学研结合,突出综合竞争力,高度重视技术、资金、人才、目标市场与配套开发条件,核心是实现高质量发展,推进综合利用。 相似文献
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截至目前 ,罗布泊钾盐开发又获得重大进展 ,现已探明钾盐资源 2 .1亿t ,比原来的资源量扩大了近一倍。我国钾资源比较短缺 ,因此罗布泊的钾盐资源开发受到各方面的高度重视。自去年年底至今 ,新疆维吾尔自治区已投入专项资金 6 6 0万元 ,启动了“罗北凹钾盐勘查项目“。目前已完成了面积为 12 0 0km2 的罗北凹地区的详查和面积为 80 0km2 东、西台地区钾盐矿的普查。发现罗北凹地区的钾盐资源已达到 1.5 4亿t ,东、西台地区也达到了 5 6 0 0万t。而这两个地区的钙芒硝也达到了超大型规模。据悉 ,今年下半年新疆维吾尔自治区还将安排… 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献