MnO2氧化法制取Ba（OH）2最佳工艺条件研究

用Ｂａ（ＯＨ）２除去工业铝酸钠溶液中的硫，将产生大量废渣（其主要成份为ＢａＳＯ４，ＢａＣＯ３），和消耗大量Ｂａ（ＯＨ）２。本提出了利用除硫废渣并补充重晶石（ＢａＳＯ４）作为原料，用软锰矿（ＭｎＯ２）作氧化剂，制取价廉的Ｂａ（ＯＨ）２的工艺方案，并对ＭｎＯ２氧化工艺过程进行了深入研究。通过（αｍｘτ）［Ｌ９（３）＾２］正交试验，得到了分子比（αｍ），反应时间（τ）与氢氧化钡产出率（ηＢＨ），钡的利     

SO3对阿利特—硫铝酸盐水泥熟料中C3S,C4A3S^—矿物形成影响？…

以纯化学试剂配料,研究了ＳＯ３对阿利特－硫铝酸盐水泥熟料中Ｃ３Ｓ,Ｃ４Ａ３Ｓ＾－矿物形成的影响。结果表明,一定量的ＳＯ４能改善生料的易烧性,促进系统中ｆ－ＣａＯ的吸收,并能保证Ｃ４Ａ３Ｓ＾－矿物良了形成及有利于Ｃ３Ｓ的形成,而当ＳＯ３含量较高时,将阻碍Ｃ３Ｓ的形成并导致熟料中ｆ－ＣａＯ升高。     

3CaO·3Al_2O_3·SrSO_4浆体结构与强度的关系

本文研究了在外掺不同硫酸盐的情况下，新水泥熟料矿物３ＣａＯ·３Ａｌ２Ｏ３·ＳｒＳＯ４的水化过程，浆体结构及其对浆体抗压强度的影响。ＳｒＳＯ４难于形成水化物。但ＳｒＳＯ４微晶沉淀对浆体结构有很强的弥散相增强作用，使浆体具有很高的强度。石膏导致在浆体中生成大量膨胀性的钙矾石相，使浆体孔隙率上升，强度下降。     

添加Li2O对BAS玻璃陶瓷相变和性能的影响

研究了溶胶─凝胶法合成的含Ｌｉ２Ｏ的ＢＡＳ凝胶玻璃的晶化行为及Ｌｉ２Ｏ加入量对ＢＡＳ玻璃陶瓷性能的影响规律。结果表明，不含Ｌｉ２Ｏ的ＢＡＳ凝胶玻璃晶化处理后获得主晶相为六方钡长石的ＢＡＳ玻璃陶瓷，加入Ｌｉ２Ｏ后，促进六方钡长石向单斜钡长石转变。     

R_2O、R_2SO_4 对硅酸盐水泥熟料烧成的影响

采用化学分析、ＸＲＤ、光学显微镜分析等方法,较系统地研究了Ｒ２Ｏ、Ｒ２ＳＯ４对硅酸盐水泥熟料烧成、矿物组成、晶体结构的影响。结果表明：Ｒ２Ｏ易形成固溶体ＫＣ２３Ｓ１２和ＮＣ８Ａ３,其中Ｋ２Ｏ主要固溶在Ｃ２Ｓ中,形成ＫＣ２３Ｓ１２,使ｆＣａＯ急剧升高;Ｎａ２Ｏ主要固溶在Ｃ３Ａ中,形成ＮＣ８Ａ３,ｆＣａＯ有所增加。Ｒ２ＳＯ４降低了熟料烧成的液相粘度,对熟料烧成有利,ｆＣａＯ含量很低。Ｒ２Ｏ和Ｒ２ＳＯ４都使Ａ矿含量降低,晶体尺寸增大。     

P2O5对煤矸石水泥性能的影响

借助ＸＲＤ、ＳＥＭ、ＤＴＡ、化学分析、物理检验等测试手段，研究Ｐ２Ｏ５对煤矸石水泥熟料的煅烧性能、物理性能和水化性能的影响，结果表明：Ｐ２Ｏ５对上述性能均有一定的影响；Ｐ２Ｏ５是一种适用于该类水泥熟料煅烧的有效矿化剂，其效果优于氟、硫及其复合的矿化剂，但Ｐ２Ｏ５与其它元素复合时，效果并不理想。     

Cr2O3,MgO对贝利特—硫铝酸钙水泥熟料矿物形成的影响

应用ＸＲＤ,ＥＤＡＸ等分析测试手段,了Ｃｒ２Ｏ３,ＭｇＯ对贝利特－硫铝钙水泥熟料矿物形成的影响。结果表明,适量的Ｃｒ２Ｏ３,ＭｇＯ主要固溶在Ｃ２Ｓ２,铁相及２Ｃ２Ｓ．ＣａＳＯ４中,并可使Ｃ２Ｓ稳定为α－Ｃ２Ｓ及α’Ｃ２Ｓ以及稳定２ＣＳ２．ＣａＳＯ４。当Ｃｒ２Ｏ３含量较高,使ＭｇＯ在熟产矿物中的固溶量显著增加。     

水泥熟料中阿里特的热稳定性研究

本文运用化学分析、岩相分析等方法研究了不同煅烧方式所生产的硅酸盐水泥熟料中阿里特的热稳定性。测定了固溶不同外加剂的阿里特的最佳分解温度。结果表明：掺加复合矿化剂的立窑熟料及低ｆ－ＣａＯ的窑外分解窑熟料中阿里特的热稳定性较好。ＣａＦ２，ＭｇＯ，ＣａＦ２＋ＭｇＯ，ＣａＦ２＋ＳＯ３，ＣａＦ２＋ＭｇＯ＋ＳＯ３均具有极好的抑制阿里特分解的作用。单掺ＳＯ３则促进阿里特的分解，大大降低阿里特的热稳定性。     

MgO对C3S,C4A3S^—矿物形成影响的研究

以纯化学试剂配普,研究了ＭｇＯ对Ｃ３Ｓ－Ｃ２Ｓ－Ｃ４Ａ３Ｓ＾－－Ｃ４ＡＦ－ＣａＳＯ４五元系统中Ｃ３Ｓ和Ｃ４Ａ３Ｓ＾－两种矿物形成的影响。结果掺加适量的ＭｇＯ可促进Ｃ３Ｓ及Ｃ４Ａ３Ｓ＾－矿物的形成,有利于其在熟料中的共存;ＭｇＯ可显著降低Ｃ３Ａ的形成量并可增加ＳｉＯ２在中间相中的固溶量。     

R2O,R2SO4对硅酸盐水泥熟料烧成的影响

采用化学分析、ＸＲＤ、光学显微镜分析方法,较系统地研究了Ｒ２Ｏ、Ｒ２ＳＯ４,对硅酸盐水泥熟料烧成,矿物组成,晶体结构的影响。结果表明：Ｒ２Ｏ易形成固 ＫＣ２３Ｓ１２和Ｎ８Ａ３,其中Ｋ２Ｏ主要固溶在Ｃ２Ｓ中,形成ＫＣ２３Ｓ１２,使ｆｃｏ急剧升高;Ｎａ２Ｏ主要固溶在Ｃ３Ａ中,形成ＮＣ８Ａ３,ｆｃａＯ有所增加,Ｒ２ＳＯ４降低了熟料烧成的液相粘度,对熟料烧成有利,ｆｃａｏ含量很低,Ｒ２Ｏ和Ｒ２ＳＯ４都使Ａ     

ICP-AES法快速测定水泥熟料中SO3的含量

利用电感耦合等离子体-原子发射光谱法(ICP-AES)测定水泥熟料中SO3的含量，并对选择样品元素分析线及共存元素的干扰进行了研究，测定结果由ICP-AES光谱测定仪直接给出，解决了用BaSO4重量法测定水泥熟料中SO3的含量分析过程中操作复杂、繁琐等一系列的问题。该方法的特点是：操作简便、分析速度快、分析结果准确而有效。     

Effect of solid solution modification on structure and properties of dicalcium silicate

In the paper, dicalcium silicate （C2 S） was modified to obtain higher performance, and the solutionizing pattern of BaSO4 in cement clinker was analyzed theoretically. According to experimental results, solutionizing of BaSO4in cement clinker improved crystal plane distance of C2S as well as the relations of coordination. The performance tests show that the strength of C2 S modified by BaSO4 changes and the reactivity of C2 S increases significantly.     

新型LF深脱硫精炼渣脱硫的实验研究

对在原渣系中加入不同质量分数的BaO、Li2O、B2O3和CaF2形成的新渣系,通过正交实验法进行脱硫实验分析。结果表明,对新渣系脱硫率影响从大到小依次是B2O3、Li2O、CaF2、BaO,加入添加剂之后的新渣系脱硫率都在80%以上;添加剂含量为w（BaO）=4%～6%、w（Li2O）=7%～10%、w（B2O3）=3%～4%和w（CaF2）≤3%时,渣系的脱硫效果最佳,实验室条件下能将钢中硫降至0.002%以内。     

稀土尾矿对水泥熟料性能的影响

试验选用云南楚雄州某地稀土尾矿,以稀土尾矿部分取代黏土原料进行水泥熟料煅烧试验。试验结果表明:掺入稀土尾矿及铅锌矿烧成熟料中的f-CaO含量明显减少,生料的易烧性提高;其3 d、7 d和28 d抗压强度均有不同程度的提高;水泥熟料中的C3S、C3A和C4AF含量有所增加,对水泥熟料的烧成起到促进作用,有利于水泥熟料矿物的形成,尤其是熟料中的C3S增加明显。     

EFFECT OF Mg ON FLUORIDE-BEARING AND SULPHUR-BEARING CEMENT BURNING

The effect of MgO on the burning processes ofclinker with SO_3 or SO_3+CaF_2 combined mineralizerare studied. It shows that exsistance of MgO isfavourable to burning processes of the clinker andcan accelerate the formation of C_3S as well as hasa supplementary action together with the combinedmineralizer. The content of MgO in the clinker isworked out about 3%. Besides, the distribution ofMgO in the clinker is also studied by which theaccelerating action of MgO on the formation of theclinker are interpreted.     

Effect of barium oxide on the formation and coexistence of tricalcium silicate and calcium sulphoaluminate

Formation and coexistence of tricalcium silicate (C₃S) and calcium sulphoaluminate (C₄A₃ ) minerals in Portland cement clinker containing calcium sulphoaluminate were investigated. The f-CaO content, mineral composite and formation of mineral in the clinker were analyzed respectively by chemical analysis, differential scanning calorimetry(DSC) and X-ray diffraction. The results show that, adding a suitable amount of BaO can improve the burnability of raw meal and promote the f-CaO absorption. Tricalcium silicate and calcium sulphoaluminate minerals can form and coexist in clinkers at 1 234–1 317 °C by the addition of BaO to the raw meal. A suitable amount of BaO expanded the coexistence temperature of two minerals by 58 °. Funded by the National Basic Research Program of China (No. 2009CB623100), National Eleven Five-Year Scientific and Technical Support Plans (No. 2006BAF02A24), the Natural Science Fund for Colleges and Universities in Jiangsu Province(No. 08KJB430006), the Open Fund for the Key Laboratory of Inorganical and Composite Materials in Jiangsu Province(No. wjjqfhxc1200801) and the Innovation Fund of Doctoral Dissertation of Nanjing University of Technology (No. BSCX200705)     

A New Kind of Eco-Cement Made of Cement Kiln Dust and Granular Blast Furnace Slag

1 IntroductionThe kiln dust is the solid waste collected fromce-ment kilns .Its chemical composition is similar to that ofcement raw meal , but the potassuim,sodium, chlorineand sulfur content and the lime saturation coefficient aremuch higherthanthose of the cement rawmeal[1].Ontheother hand,the binding water of it is relatively lowandthere are some clinker minerals . Generally,cement kilndust can be classifiedintotwo categories .One isthe dustfromdry process rotary kilns (without preheater …     

含BaO,Na2O渣系渣钢间硫平衡研究

在钼丝炉上进行了含BaO,Na2O精炼渣系渣钢间流平衡实验。研究 结果表明,在传统精炼渣系中加入BaO,能够提高渣系的硫容量,Na2O对渣系的硫容量也有很大的影响,但稳定性不好。