粉煤灰基地质聚合物固化低放射性稀土酸溶渣

离子型稀土酸溶渣是一种低放射性废渣，需要进行安全化处置。以稀土酸溶渣和粉煤灰为原材料，在碱激发剂的作用下制备地质聚合物，通过SEM、XRD、FTIR手段分析放射性核素在地质聚合物的固化机理。结果表明，当Si/Al摩尔比为2.0，Na/Al摩尔比为0.9，75 ℃固化24 h时，养护1 d所制得的地质聚合物抗压强度达45 MPa，制备的地质聚合物具有非晶态Si/Al凝胶相，内部结构致密均匀，具有良好的力学性能。在酸溶渣添加量为25%时，地质聚合物固化体抗压强度可达12 MPa。对添加酸溶渣固化体进行浸出试验，渣添加量为25%时固化体中钍的7 d浸出率为3.47×10-5 cm/d，7 d累计浸出分数为4.42×10-5 cm，实现了放射性核素的有效固化。钍、铀以沉淀及化学键结合两种方式存在于地质聚合物中。     

锰渣基地质聚合物的制备研究

对以锰渣作为基础原料的地质聚合物进行制备研究,通过测试其胶砂试块强度,分析不同锰渣掺量的锰渣基地质聚合物力学性能,利用SEM、XRD等方法分析该类聚合物的反应产物.实验表明:该类地质聚合物锰渣掺量80%为最佳;制备得到的地质聚合物前期强度发展较快,抗折强度5 MPa以上,抗压强度62.5 MPa以上.     

冷固结球团用地聚合物黏结剂制备参数优化

 针对目前广泛使用的冷固结球团黏结剂高温下失效的缺点，提出使用地聚合物体系材料作为黏结剂，以保证球团的高温性能。首先使用化学分析、X射线衍射分析、红外光谱等方法对地聚合物黏结剂原料性能进行分析；随后制备偏高岭土-水玻璃地聚合物体系黏结剂并进行冷固结压块，分别研究黏结剂制备过程中参数养护温度、养护时间、n（H2O）/n（Na2O）、n（Na2O）/n（SiO2）和n（SiO2）/n（Al2O3）对球团冷态抗压强度的影响，得出此黏结剂制备最佳参数；最后探讨了地聚合物黏结剂球团高温强度演变规律。结果表明，将最优条件下制备的黏结剂应用于冷固结球团，强度可达402.3 N/个 ，满足生产要求；在惰性气氛下，地聚合物黏结剂压块强度随温度升高而升高，且高温下强度增加幅度变大，这表明地聚合物黏结剂在高温下不会失效，且高温有利于黏结剂抗压强度增加。     

工业硅生产用碳质还原剂球团的制备研究

实验以石油焦粉为原料制备工业硅生产用碳质还原剂球团,研究了微硅粉含量、润湿介质的种类、含水率、成型压力、润湿介质(NaOH溶液)浓度、粘结剂含量对球团湿球抗压强度、干球抗压强度、抗碎率、热强度与孔隙率的影响。研究结果表明:微硅粉含量为8.0%,润湿介质选用NaOH溶液,其浓度为5.0 mol/L,含水率为10.0%,成型压力为30 MPa,粘结剂含量为4.0%时,制备的球团性能最佳。     

热镀锌渣的利用

以硫酸浸出热镀锌渣获得硫酸锌溶液和饱和碳酸氢铵溶液为原料,用直接沉淀法制备出了平均粒径20 nm左右的纳米氧化锌。制备过程中对影响前驱体和纳米氧化锌的粒度的一些因素进行了实验研究。结果表明:在反应温度55℃,饱和碳酸氢铵的加入速度4 mL/min,沉淀终点pH=7.0的条件下,从锌浓度为100 g/L的ZnSO4溶液中可以获得平均粒径1.6μm的碱式碳酸锌前驱体。在600℃,焙解60min的条件下可获得粒径20 nm左右的纳米氧化锌。     

利用攀枝花提钒尾渣制备蒸压砖试验研究

以攀枝花地区的提钒尾渣、石灰与黄沙为原料,采用压制成型—蒸压养护法制备了蒸压砖,研究了升降压速度、蒸气压力与养护时间对样品抗压强度的影响,分析了样品的组成与显微结构,检测了样品的综合性能及放射性指数。结果表明:提高升压速度与蒸汽压力使样品的抗压强度先增大后减小,适当降低降压速度和延长养护时间可改善样品的抗压强度。当提钒尾渣、石灰与黄沙的质量分数分别为60%、23%与17%,升降压速度为0.7 MPa/h,蒸汽压力为2 MPa,养护时间为7 h时,制品的强度及放射性指数可满足相关的行业标准。XRD和SEM分析结果表明:经过蒸压养护后,制品中形成了针棒状的托贝莫来石,板片状的硬钙硅石与无定型水化硅酸钙等物相,上述水化产物与粗粒骨料相互交织,形成致密的结构,使制品具有较高的抗压强度数。     

细磨卡粉制备熔剂性球团的试验研究

粗粒卡粉经细磨后是一种优质的球团原料,具有降低膨润土用量、改善球团冶金性能等优点。本文以经湿式球磨得到的卡粉为原料,研究细磨卡粉用于制备熔剂性球团(碱度=0.8)时,卡粉配比及预热焙烧制度对生球和成品球质量以及冶金性能的影响。结果表明,细磨后卡粉的微细颗粒质量分数增大,比表面积达到1 619 cm~2/g;随着细磨卡粉配比由35%提高至45%时,生球落下、抗压强度明显提高,有利于降低膨润土用量;成品球抗压强度由2 971 N/P降至2 855 N/P,但仍可满足高炉冶炼要求。另外,细磨卡粉的配入可以改善成品球的还原性和高温软熔性能。     

地质聚合物的制备与应用研究现状

地质聚合物是由硅铝酸盐原料经激发剂激发得到的一种无机非金属材料,具有原料来源广泛、制备简单、碳排放量低、高强耐久等优点,应用前景非常广阔。介绍了地质聚合物及其性能特点,对制备过程中的原料活化、激发剂、外加剂和养护制度等工艺的研究现状进行了总结,列举了地质聚合物在胶凝材料、隔热吸音、催化剂和固封材料等领域的应用实例,并评述了其在制备及应用方面需要进一步探索的问题。     

电感耦合等离子体原子发射光谱法测定保护渣中氧化钾和氧化钠

保护渣试样经盐酸、硝酸、氢氟酸酸化溶解,高氯酸冒烟后的残渣用盐酸溶解,选择766.485 nm和589.586 nm的光谱线分别作为钾和钠的分析线,在体积分数5%盐酸介质中用电感耦合等离子体原子发射光谱法(ICP-AES)测定试液中氧化钾和氧化钠含量。方法的检出限,对于钾为0.001 μg/mL,对于钠为0.005 μg/mL。基体对钾、钠测定的干扰程度较小,元素间基本无干扰,可以直接用氧化钾、氧化钠标准溶液绘制校准曲线。方法用于氧化钾和氧化钠含量不同的保护渣样品分析,氧化钾和氧化钠测定结果与化学法测定结果相符,无显著性差异,相对标准偏差(RSD)小于2.0%,可以满足保护渣试样成分的测定要求。     

原料对低铜电刷导电性能的影响

以电解铜粉和天然石墨的混合粉为原料,采用压制、烧结工艺制备电刷试样,研究电解铜粉松装密度和石墨粒度对低铜电刷导电性能的影响,并与以铜包石墨粉为原料制备的电刷进行对比.用SEM观察粉末和试样的形貌,用电碳制品电阻率测试仪测定试样的电阻率.结果表明:以混合粉为原料制备的电刷,当铜含量w(Cu)为30％时,随着电解铜粉松装密...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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