氯化钾(来自盐田光卤石矿)在高镁母液中可浮性的研究

引言1958年以来,上海化工研究院和化工矿山设计研究院,先后曾对察尔汉地区进行过沟槽日晒光卤石矿和天然沉积光卤石矿经淡水分解后得到的粗钾用浮选法加工成精钾的试验研究。浮选过程基本上是在含 MgCl_2量     

光卤石分解制取氯化钾晶体粒度控制技术

讨论了1×106t钾肥生产线光卤石分解、氯化钾结晶的晶体粒度影响因素,给出了最佳工艺控制条件,使氯化钾的产品粒度70%0.2 mm,基本达到了设计要求,降低了湿产品的含水量,减少了干燥成本。     

冷分解-浮选工艺的影响因素

初步探讨了利用车间生产设备 ,冷分解 -浮选钾肥生产的影响因素。通过化工、选矿有关理论在本工艺中的运用 ,判断出冷分解—浮选工艺的冷分解过程是影响车间生产的关键过程。这为钾肥生产的设备调试奠定了基础。     

用冷分解—热溶结晶法由察尔汉盐湖盐田光卤石制取 KCl 小试验报告

一、前言一九五八年,青海省察尔汉盐湖建立了察尔汉钾肥厂。其生产工艺是采用冷分解一洗涤法加工光卤石矿生产氯化钾。但由于该法氯化钾收率低,一九六○年后,曾试用全溶法加工光卤石制取氯化钾未获成功。一九六八年改用浮选法进行加工,目前生产能力已达2万吨/年。可是浮选法所得 KCl产品结晶细小,质量较低,易结块,不利于贮存,运输和使用。     

青海察尔汉盐湖深水盐田光卤石矿物化特性研究总结报告

虽然国家“七五”重点工程一青海钾肥厂已转入生产阶段近九个年头，但对用盐湖卤水通过大面积深水盐田（池内水深1M左右）晒制光卤石在我国至今缺乏成熟的经验。本文就是通过对青海钾肥厂十平方公里盐田的西光卤石池光卤石矿六年的定期取样分析资料，总结出深水盐田光卤石矿的物化特性及其形成机理，以便为其它与将来特别是青钾二期工程更大面积的盐田生产和盐田管理提供基础和指导。本文是目前对深水盐田光卤石矿物化特性进行全面描述的唯一资料。     

盐田“兑卤—蒸发”工艺缩短成矿周期的可行性分析

依据K~+,Na~+,Mg~(2+)∥Cl~--H_2O四元水盐体系相图,以察尔汗盐湖原卤为原料,采用"兑卤—蒸发"工艺制取含钠光卤石矿原矿,通过相图分析及"物料衡算",探讨了缩短成矿周期的可行性。结果表明,采用盐田"兑卤—蒸发"工艺缩短成矿周期是不可行的,而且兑卤后得到的含钠光卤石原矿品质有所下降。     

软钾镁矾溶解动力学Ⅰ:对K~ ,Mg~(2 )/SO_4~(2-)—H_2O三元体系的研究(50-75℃)

前言青藏高原的诸多盐湖中存在大量的钾、钠、镁复盐,如KCI和KSO。这两种钾肥可以由盐湖中所含的钾钱复盐光卤石和软钾镁矾（K。SO。·MgSO。·sH刀）在水中溶解制得,因此,有必要对复盐溶解过程进行系统的研究,夏树屏等人‘’,‘’已对复盐氯碳酸镁和氯柱硼镁石等的溶解转化机理和动力学进行了较为详细的研究,解决了不同类型复盐的研究方法和数据处理方法。德国和独联体两国的学者对钾光卤石固体盐矿的工艺及基础研究曾进行过不少的工作H．H．Emons和HVo…等‘”对钾光卤石的天然单晶和压块光卤石不同条件下的溶解速度常数及…     

利用光卤石和无水芒硝制取硫酸钾技术的进展

硫酸钾是重要的无氯钾肥,其生产方法较多。主要介绍“利用盐田光卤石和天然无水芒硝为原料制取硫酸钾”的专利技术的实施与进展,对年产万吨硫酸钾工业性试验的实际运行结果进行了分析与总结     

察尔汗盐湖低品位卤水自然蒸发试验研究

察尔汗盐湖是一个以卤水钾镁盐矿为主的大型综合性盐类矿床,盐湖东部潜卤水水化学类型为氯化物型,从KCl等组份含量来看,属低钾高钠低镁的卤水。对该类型卤水进行自然蒸发试验,确定盐类结晶析出顺序和光卤石矿物的最佳分离点,取得光卤石矿的产率和光卤石中KCl含量等基础数据,以对该卤水工业利用性能作出评价。     

盐田光卤石生产工艺控制因素浅析

根据察尔汗盐湖别勒滩卤水等温蒸发试验数据,结合大量生产取样分析资料,对盐田光卤石矿生产机理及其控制因素作了分析研究,并提出了管理措施。     

Primary production and decomposition in the coastal zone of the northern part of the Aral Sea near the delta of the Syr Dar'ya

Data are given on the concentration of suspended organic carbon and chlorophylla in seston, the quantity of organic carbon in bottom sediments, and other environmental characteristics. The results of experiments determining daily quantitites of total and net primary production and aerobic decomposition in plantonic and bottom communities are discussed.     

江南丘陵地区乡村聚落地域分异特征研究——以湖南省为例

以江南丘陵湖南地区为研究对象,通过对18个抽样村进行实地走访与问卷调查,从乡村聚落的居住条件、居住设施和乡村居民的生产生活形态等方面,探讨江南丘陵湖南地区乡村聚落空间地域分异特征与规律。研究表明：乡村聚落研究是江南丘陵地区乡村聚落空间布局优化与调控的基础。由于地域范围广泛,区域内的资源禀赋与地域组合、经济发展基础、文化传统等条件差异悬殊,因此江南丘陵湖南地区乡村聚落发展的地域分异规律较为明显,在聚落空间格局（规模、密度、形态）、居住条件（住房面积、住房结构、建筑特色）、居住设施（道路、饮水安全、网络电视开通率等基础与公共服务设施）和生产生活形态等方面呈现出较为显著的盆地-丘陵-低山区、发达-欠发达-落后、近郊-远郊-偏远等地貌、经济、区位梯度差异。     

The problems of development of the Kholodninskoye lead and zinc deposit (Northern Baikal region)

We examine the pre-project data related to development of the Kholodninskoye lead and zinc ore deposit from the standpoint of ecological and economic soundness of the proposed production and engineering aspects of the design. Some of the proposals and recommendations are aimed at improving environmental safety of the projected facilities for extraction and benefication of mineral raw materials in conditions of the Central Ecological Zone of the Baikal Natural Territory, a World Natural Heritage Site.     

Spatial Patterns of Hazardous Waste Generation and Management in the United States

Hazardous waste is generated in the production of almost all consumer goods, especially those that contain plastic. The United States is the world leader in generating hazardous waste with 214 million tons produced in 1995. The majority of this waste was wastewater generated by the fifty largest generating facilities, disproportionately concentrated along the western Gulf Coast. The largest facilities also treat most of their waste on site, particularly wastewater. Most smaller generators send waste an average of 200 miles for treatment or disposal. Among both citizens and state governments there is resistance to local siting of waste facilties. Local resistance has convinced businesses or government agencies to look elsewhere to site a proposed facility. State efforts to directly control the flow of hazardous waste have not been successful due to court challenges from industry and subsequent decisions that state restrictions violate the Commerce Clause of the U.S. Constitution. Taxes on both in‐state and out‐of‐state waste have proven effective at reducing in‐state waste disposal.     

城市公共服务设施与人口是否匹配?——基于社区生活圈的评估

公共服务设施是城市社会服务最基本的承载体,公共服务设施分配的公平与否,事关城市健康发展和社会公正运行.目前由于城市微观尺度人口数据的缺失,鲜有研究将供给侧(公共服务设施)与需求侧(人口)统一起来.鉴于此,论文以互联网地图API为支撑,建立了5min、10 min、15min三个层级的社区生活圈,并模拟了高分辨率、高精度...     

基于LMDI的中国特大城市能耗变化量的分解分析

特大城市的能耗在全国能源系统中扮演着极其重要角色,但其能耗已从生产领域转向城市功能和自身发展方面。因此,本文利用迪氏对数指标分解法对1996-2012年间32个特大城市的能耗变化做因素分解分析,综合考虑城市经济增长、人口规模扩大和空间扩张三方面因素的基础上选取5项指标,计算其对城市能耗的贡献率,分析共性与差异,以更有针对性的开展城市能源管理和节能减排工作。     

Impacts of El Nino-Southern Oscillation events on China＇s rice production

This paper aims to demonstrate the relationships between ENSO and rice production of Jiangxi province in order to identify the reason that ENSO might have little effect on Chinese rice production. Using a data set with measures of Jiangxi’s climate and rice production, we find the reason that during 1985 and 2004 ENSO’s well correlated with rainfall did not promote Chinese rice production. First, the largest effects of ENSO mostly occur in the months when there is no rice in the field. Second, there is almost no temperature effect. Finally, the monthly distribution of rainfall is almost the same in ENSO and neutral years because the largest effects are during months when there is the least rain. In addition, due to the high irrigation share and reliable and effective irrigation facilities of cultivated land, China’s rice production is less climate-sensitive.     

Examining the economic impact of park facilities on neighboring residential property values

The economic impacts of parks on adjacent property values have been extensively studied in the literature. Studies on how individual park facilities influence property values, however, are rarely found. While park facilities are essential for providing diverse recreational opportunities, their economic impacts should also be considered when designing a park system. This study, therefore, applied hedonic regression models to examine the impacts of park facilities on neighboring residential property values within the city of Minneapolis, Minnesota, United States. The park facilities examined are divided into two categories: passive (i.e. passive recreation space, water features, and gardens) and active (i.e. children's play grounds, ball fields, tennis courts, skate park, etc.). Analysis of results suggests that park facilities for passive recreation, with the exception of urban gardens, are likely to have positive impacts on property values. Active facilities, especially skate parks and children's play areas, tend to introduce negative impacts. The impacts of facilities on property values decrease over distance zones from parks, which is consistent with the findings in the literature. Moreover, the impacts of facilities on property values vary with size, as gardens and most active facilities are more likely to be beneficial in small parks, while water features in large parks tend to increase property values.