我国查明低品位铁矿资源储量分析

以最新全国储量数据库为基础,分析总结我国查明低品位铁矿资源储量的数量、分布特点、类型、矿床规模及矿石可选性等。结果表明:我国查明低品位铁矿资源储量约184亿吨,约占全部铁矿石资源量的30%。主要分布在河北省、辽宁省、山西省等近17个省(区)。主要矿床类型有沉积变质型、沉积型、接触交代-热液型等。小型矿多,大型矿少。大型低品位铁矿区仅占查明数的1.08%,而储量却占我国低品位铁矿查明资源储量的62.37%。我国查明低品位铁矿石基本可选,部分易选,难选矿石仅占2.17%。     

2010年中国烯烃供需回顾及2011年展望

回顾了2010年我国烯烃的供需状况,并展望了2011年的供需前景.     

1000℃下焙烧低品位钡矿的实验研究

为了对低品位钡矿在1000℃下的热分解的无益组分进行水浸．采用热分解因素条件实验、DTA-TG热分析、XRD产物衍射分析及用动力学计算对四川万源庙子的低品位钡矿在1000℃下的热分解行为和各组分水浸规律及其机理进行研究。得出了四川万源庙子的低品位钡矿在1000℃下对钡富集的最佳焙烧条件是粒度为40-120目．焙烧温度为950℃，焙烧保温时间3小时。万源庙子低品位钡矿在700℃～1000℃的热分解变化规律是：在720℃～815℃白云石、钡白云石、部分钡解石分解．由成核与生长机制控制．动力学方程式为：-ln(1-a)=kt．在815℃～1000℃．白云石、钡白云石、钡解石延续第一阶段分解及白云石生成CaCO2和矿石中方解石的分解．并有小量碳酸钡、碳酸锶的分解．整个过程由三维扩散．3D(球对称)的机制控制．动力学方程式为：[1-(1-a)^1/3]=kt。     

Fabrication of sustainable magnesium phosphate cement micromortar using design of experiments statistical modelling: Valorization of ceramic-stone-porcelain containing waste as filler

Magnesium phosphate cement (MPC) is a potential sustainable alternative to Portland cement. It is possible to lower the total CO₂ emissions related to MPC manufacturing by using by-products and wastes as raw materials. When by-products are used to develop MPC, the resultant binder can be referred to as sustainable magnesium phosphate cement (sust-MPC). This research incorporates ceramic, stone, and porcelain waste (CSP) as a filler in sust-MPC to obtain a micromortar. Sust-MPC is formulated with KH₂PO₄ and low-grade MgO (LG-MgO), a by-product composed of 40–60 wt% MgO. CSP is the non-recyclable glass fraction generated by the glass recycling industry. The effect of water and CSP addition on the mechanical properties of sust-MPC was analyzed using design of experiments (DoE). A statistical model was obtained and validated by testing ideally formulated samples achieved through optimization of the DoE. The optimal formulation (15 wt% of CSP and a water to cement ratio of 0.34) was realized by maximizing the compressive strength at 7 and 28 days of curing, resulting in values of 18 and 25 MPa respectively. After one year of curing, the micromortar was physico-chemically characterized in-depth using backscattered scanning electron microscopy (BSEM-EDS) and Fourier transform infrared-attenuated total reflectance spectroscopy (FTIR-ATR). The optimal formulation showed good integration of CSP particles in the ceramic matrix. Thus, a potential reaction between silica and the K-struvite matrix may have occurred after one year of curing.     

低品位铁矿中铜离子的淋溶规律及环境影响研究

本文模拟室外酸雨,对某地低品位铁矿堆场样品进行了动态淋溶实验。结果表明在一定酸雨和降雨量条件下,淋溶出的Cu₂ 浓度与淋滤体积呈指数衰减关系,建立了低品位铁矿中铜的淋溶释放模型。证明了在一定的酸雨环境条件下,铁矿中的铜将逐渐溶出,造成堆放场地毒化,地下水污染等环境影响。     

有机朗肯循环的发电系统的实验研究

以低温热蒸汽来模拟废热作为有机朗肯循环(ORC)的热源,建立了以R134a为制冷剂的有机朗肯循环发电系统。通过EES(engineering equation solver)软件对ORC系统进行了数学建模,并将实验与模拟结果进行了比较。结果表明:系统以R134a为工质运行,可以达到8%的发电效率;当膨胀机进口的状态为饱和或者过热时,系统的热效率与发电量都会随着进口压力的增加而增加;系统压力较低的时候,系统的不可逆程度较大,系统效率会有较大损失。