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根据察尔汗盐湖钾盐生产的实际情况,分别从固液转化技术、冷分解结晶技术、兑卤工艺回收正浮选产生的尾液、采用布袋除尘器除尘4方面分别阐述了提高察尔汗盐湖钾资源综合利用率的方法,对合理利用钾资源、延长钾盐矿的服务年限、缓解钾资源短缺局面具有积极意义。 相似文献
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加水比例及物相行为研究对硫酸镁亚型盐湖钾镁混盐转化制备软钾镁矾工艺具有重要意义。以柴达木盆地一里坪盐湖钾镁混盐为对象,采用“转化-浮选”法制备钾盐镁矾,研究了钾镁混盐初始及转化产生的物相行为。结果表明,初始物相光卤石、水氯镁石溶解速率最快,分解得到新物相氯化钾。初始物相钾盐镁矾及其转化得到的新物相软钾镁矾,溶解转化速率次之,加水比例高于0.40时,速率趋于平缓。初始物相氯化钠溶解速率始终最低。转化过程中,氯化钾只发生溶解行为,并未与软钾镁矾反应生成新物相硫酸钾。转化实验结果与理论计算结果吻合度高,相对误差低于4%,利用介稳相图理论计算能够指导钾镁混盐转化。同时,正浮选捕收剂对含钾物相的捕收吸附能力强于反浮选,钾的总收率达到66%。 相似文献
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氯化钾生产中分解工序对钾收率的影响研究 总被引:2,自引:0,他引:2
正浮选法生产氯化钾其钾离子收率低,主要影响因素为分解工序的原矿类型、加水量和温度等。以实际生产为基础,以分解工序为对象,研究影响产品质量、钾收率的各因素,并针对不同的原矿做尾液回用实验。结果表明:当分解完成母液点相同时,原矿的钠钾比越大,产品质量越低,二者呈对数关系;原矿的镁钾比越大,钾收率越低,二者呈线性关系;钾收率随分解工序加水量增大而降低,原矿的镁钾比越大,钾收率随加水量增大而降低的幅度就越大;尾液回用时,因原矿的氯化镁与(氯化钾+氯化钠)的质量比不同,要使原矿在15min内完全分解,需控制不同的母液点;当加水量相同时,原矿的镁钾比越大,随温度升高钾收率降低的幅度就越大。 相似文献
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本文主要介绍钾混盐通过转化制得低品位的软钾镁矾后,与KCl配料复分解转化制取硫酸钾的工艺过程。 相似文献
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在以磷石膏钙渣和不溶性含钾岩石为原料制备新型硅钙钾肥的最佳生产工艺条件的基础上,考察了混合均匀度(以SO2-4的含量来表示)随混合时间的变化规律;采用不同混合时间段的原料制备硅钙钾肥,测定了钾的转化量随混合时间的变化情况。试验结果表明:磷石膏钙渣与不溶性含钾岩石均匀混合时,硅钙钾肥中钾的转化量随着原料粒度的减小而增大,当原料粒度180μm(80目)时,不溶性钾完全转化为可溶性钾;但当原料粒度达到180μm(80目)时,原料混合不均匀会影响硅钙钾肥中钾的转化量,即混合时间不足90 s时,硅钙钾肥中钾的转化量小于5.19%。 相似文献
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磷石膏两步法生产硫酸钾的探讨 总被引:4,自引:0,他引:4
探索以磷石膏、碳酸氢铵和氧化钾为原料 ,两步转化法生产硫酸钾并联产氯化钾铵复合肥的工艺 ,为磷石膏的合理利用、农用碳铵的结构调整和硫酸钾的制备开辟了一条新途径。在适宜的反应条件下 ,产品硫酸钾的主要指标超过国标农用一等品要求 ,K2 O >47.0 %,CI- <2 .2 %,K+的一次转化率为72 .2 %,磷石膏中SO42 - 的转化率达到 98.8%。 相似文献
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不同有机胺对石膏法制取硫酸钾工艺的影响 总被引:3,自引:0,他引:3
研究了多种有机胺介质(三乙胺、甲酰胺、乙二胺、六次甲基四胺)对石膏转化氯化钾制取无氯钾肥硫酸钾的影响,结果表明:4种有机胺介质中,以六次甲基四胺对该液固反应的促进作用最为强烈,不仅有较高的氯化钾转化率,而且操作简便,无污染,成本低廉。同时找出了以六次甲基四胺为反应介质时的优选工艺条件。 相似文献
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本文研究了不同种类天然石膏对石膏转化氯化钾制取无氯钾肥硫酸钾的影响,结果表明:天然石膏纯度越高,氯化钾转化率也相应提高。 相似文献
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An increasing price for primary energy makes thermal conversion of biomass a very attractive alternative to produce energy. However, emissions emanating from combustion for example are of concern due to legal limits and impact components of the combustor negatively by corrosion. One of the major emission components is potassium chloride. In a vapor atmosphere it may form a very aggressive environment that will corrode boilers. Therefore, the object of this study is to evaluate the kinetic data describing the formation of potassium chloride during switchgrass combustion. Experimental data that records the combustion process and the emission formation versus time, carried out by the National Renewable Energy Institute in Colorado (US), was used to evaluate the kinetic data.The approach is based on the Discrete Particle Method (DPM) that solves the coupled differential conservation equations for mass and energy of a switchgrass particle. Processes considered were heating-up, pyrolysis, combustion of switchgrass and evaporation of potassium chloride. Thus, the conversion process of switchgrass is described sufficiently accurate in particular the evolution of temperature. The evaporation of potassium chloride is approximated by an Arrhenius-like expression including a pre-exponential factor and an activation energy. These parameters were determined by a least-square method so that the deviation between the measured data and the predictions was minimized. The kinetic data determined yielded good agreement between experimental data and predictions. 相似文献
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以过氧乙酸为氧化剂,研究了青霉素发酵液直接氧化制备青霉素G亚砜的过程,考察了不同影响因素对青霉素G亚砜转化率的影响,分析了氧化后菌丝中青霉素残留,建立并优化了青霉素发酵液直接氧化工艺。结果表明,搅拌转速、反应温度、过氧乙酸投料量、过氧乙酸浓度等因素是青霉素G亚砜转化率的关键影响因素,其他因素对青霉素发酵液直接氧化过程影响较小。过氧乙酸直接氧化青霉素发酵液可释放出残留在菌丝体内的青霉素,相比氧化青霉素G钾盐的转化率更高。最佳氧化工艺条件为反应温度5~10℃,搅拌转速100 r/min,30 min匀速加入青霉素摩尔量1.3倍的高浓度过氧乙酸,继续搅拌反应10 min。青霉素G亚砜的转化率可达98.6%,比青霉素G钾盐为原料的转化率提高1.2%。 相似文献
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以高灰熔点煤和含钾催化剂的灰渣为研究对象,分别考察了加压固定床反应器中K2CO3催化半焦水蒸气气化的反应性和灰渣中钾催化剂的回收特性。实验结果表明煤中添加K2CO3能够促进碳的转化,随着K2CO3负载量和气化温度的增加,碳转化率增大,CH4收率增加。在3.5 MPa和800℃下,K2CO3负载量为15%时,碳转化率达到96.1%,CH4收率达到0.24 m3·(kg C)-1。灰渣中钾催化剂的回收率随碳转化率的增加先升高后减小,这与催化剂在灰渣中的存在方式有关。通过优化水洗和消解条件,高碳转化率下灰渣中的钾催化剂的总回收率高达96.5%。 相似文献
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Jeon Jong-Ki Kim Chang-Jun Park Young-Kwon Ihm Son-Ki 《Korean Journal of Chemical Engineering》2004,21(2):365-369
The effects of potassium or lanthanum additives on the catalytic properties of alumina-supported cobalt catalysts were examined
through carbon monoxide hydrogenation reaction. The catalysts were characterized by hydrogen or carbon monoxide chemisorption,
oxygen titration, and temperature-programmed desorption. The reactions were carried out at 270 °C and atmospheric pressure.
When a small amount of potassium was added to alumina-supported cobalt catalysts, the amount of hydrogen adsorption decreased
more significantly than that of carbon monoxide adsorption, and the extent of reduction also decreased. With the addition
of potassium, the overall carbon monoxide conversion decreased, while the selectivity to higher hydrocarbon and olefin increased.
The effect of lanthanum on activity and selectivity in carbon monoxide hydrogenation was less significant than the effect
of potassium. Temperature-programmed desorption showed that the presence of additives changed the adsorbed state of CO on
cobalt.
This paper is dedicated to Professor Hyun-Ku Rhee on the occasion of his retirement from Seoul National University. 相似文献