测定三氧化二锑指示剂的改进

主要讨论了混合指示剂Fe(phen) 2 + 3 在酸性介质中与Ce4+ 反应显绿色、与Fe2 + 反应显红色的特点。使用硫酸亚铁铵返滴过量的硫酸铈来定量测定三氧化二锑的方法 ,具有终点颜色变化明显和结果稳定性高的优点 ,改进了以往甲基橙为指示剂、终点由橙色变黄色且不易观察的现象     

影响锑白炉Sb2O3白度的因素

分析影响Sb2O3白度的几种因素,探寻各种因素与Sb2O3白度之间的关系,找到最佳工艺技术操作条件,提高自热式锑白炉Sb2O3白度,更好地适应高技术产品对锑白白度的要求。     

PbS-Sb2S3-FeS三元系在水蒸气气氛下的铅锑分离

在1073K下通过测定三硫化锑和硫化铅的挥发速度,研究了PbS-Sb_2S_3-FeS三元系在水蒸气气氛下的铅锑分离规律。X-射线衍射结果表明,焙砂由PbS、Fe_3O_4、FePb_4Sb_6S_(14)、Pb_5Sb_4S_(11)和FeSb_2O_4组成。当试样中FeS含量在5％～7％时,铅锑分离效果最好。当试样中FeS的含量≥10％时,铅锑分离效果较差,这时过量的FeS会与Sb_2S_3和PbS形成复杂的硫化物(FePb_4Sb_6S_(14)、Pb_5Sb_4S_(11))或被氧化成F4Sb_2O_4,使锑的挥发变得困难,导致残留在焙砂中的锑含量升高。     

用等离子体蒸发制备超细高纯锑白的研究

以三氧化二锑为原料,应用等离子体蒸发,经高温后急冷凝聚、收尘,获得高纯超细微Sb2O3粉末,粒度0.1~0.23μm。     

Determination of the standard gibbs energies of formation of Ca3As2, Ca3Sb2, and Ca3Bi2

The standard Gibbs energies of formation of Ca₃As₂, Ca₃Sb₂, and Ca₃Bi₂ were determined by a chemical equilibration technique yielding the following results: 3Ca(1)+2As(1)=Ca₃As₂ (s) ΔG°=−723,800+172.8T (±23,700)(J/mol) 1273 to 1573 K 3Ca(1)+2Sb(1)=Ca₃Sb₂(s) ΔG°=−726,300+159.3T(±24,600) (J/mol) 1273 to 1573K 3Ca(1)+2Bi(1)=Ca₃Bi₂(s) ΔG°=−696,400+195.6T(±23,200) (J/mol) 1148 to 1323 K The thermodynamic data for removal of arsenic, antimony, and bismuth by other experimental investigations were discussed in terms of the activity coefficients of these compounds in slags. The stabilities of these compounds were also discussed by using the critical oxygen partial pressures calculated from the above equations. D.J. MIN, formerly Graduate Student, Department of Metallurgy, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan     

自热工业炉生产微粒三氧化二锑的工业试验研究

进行了自热工业炉生产微粒三氧化二锑的工业试验,介绍了工艺原理、技术条件、产品质量、经济技术指标,并与等离子体工艺进行了比较.     

SiO_2-FeO-CaO-Na_2O渣系锑氧粉还原熔炼研究

设计了一种适用于锑氧粉熔池还原熔炼的低熔点渣SiO_2:FeO:CaO:Na_2O=30:34:12:24,通过单因素试验法研究熔炼时间、焦率和熔炼温度对锑氧粉还原熔炼过程的影响。得到的最佳条件为:熔炼时间50 min、焦率12.5%、熔炼温度1 000℃,在此最优条件下进行扩大试验,金属锑直收率为92.66%,渣含锑为1.06%,粗锑品位为97.09%,均优于传统反射炉工艺。     

Sb2O3粒径对其应用的影响及生产控制

简述Ｓｂ２Ｏ３粒径的大小，在其应用中对聚合物基体的机械性能、着色性、阻燃增效效能等方面的影响．并简单介绍在火法自动化生产工艺中的控制     

提高沸腾炉三氧化二锑产出率的实践

叙述了脆硫锑铅精矿生产精锑的工艺,分析了造成脆硫锑铅精矿沸腾焙烧过程中三氧化二锑产出率偏低的原因,介绍了采取的措施及实施效果.     

提高沸腾炉三氧化二锑产出率的实践

叙述了脆硫锑铅精矿生产精锑的工艺,分析了造成脆硫锑铅精矿沸腾焙烧过程中三氧化二锑产出率偏低的原因,介绍了采取的措施及实施效果。     

铈改性固体超强酸SO2-4/Sb2O3的制备及催化性能研究

以SbCl3为原料经醇化水解制 Sb2O3前体氧化物,通过浸渍一定量的(NH4)2SO4和掺杂Ce4+制备了一种新型催化剂SO42-/ Sb2O3/Ce4+ .以催化合成乙酸苄酯为探针反应,考察了(NH4)2SO4的浓度、Ce(NO3)4 的浓度、焙烧温度等因素对其催化性能的影响,并采用IR、TG/DTA、Hammett法等对其进行表征.结果表明,1.5 mol·L-1的(NH4)2SO4和含Ce(NO3)4 2.8%的混合液浸渍锑前体氧化物,经110℃烘干后,于350℃焙烧2 h所得的催化剂活性最好,其酯化率达到97%..     

等离子体生产Sb2O3的装置及工艺

详细介绍了等离子体生产Sb2O3的主要设备、生产工艺及产品质量。     

Preparation of Ce4+, Sb3+-Codoped TiO2 Films in Electric Field Heating-Treatment

Titania is an important catalytic material for photo-catalytic applications, and the sol-gel process is one of the most appropriate technologies to prepare TiO2 thin films. In the present paper, the Ce4 , Sb3 -codoped TiO2 films were prepared by sol-gel method, which were heat-treated with an applied electric filed. The phase transformation behavior of Ce4 , Sb3 -codoped TiO2 film in the electric field heating-treatment was studied by XRD and AFM. It is found that the crystals were homogeneous and the average crystal size was about 60 nm. Studies of photo-catalytic degradation show that the photo-catalytic activity of Ce4 , Sb3 -codoped TiO2 films heated to 500 ℃ in an applied electric field was higher.     

Phase composition and thermodynamic properties of alloys of the Te—PbTe—Sb2Te3 system

The phase composition and thermodynamic properties of Te−PbTe−Sb ₂Te₃ alloys are determined by means of X-ray phase analysis and measurements of electromotive forces in the temperature range 540–660 K. The formation of the Pb₂Sb₆Te₁₁ ternary compound in this temperature range has not been confirmed. The results of the electrochemical measurements confirm the mutual solubility of the components of the quasibinary PbTe−Sb₂Te₃ system. The activities of PbTe are determined in the (PbTe+Sb₂Te₃) phase field. Institute for Problems of Materials Science, Ukraine National Academy of Sciences, Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 5–6(407), pp. 66–69, May–June, 1999.     

稀土固体超强酸S2O82-/Sb2O3/La3+的制备及催化性能研究

以SbCl3为原料经醇化水解制得Sb2O3前体氧化物,通过浸渍一定量的(NH4)2S2O8和掺杂La(NO3)3制备了一种新型催化剂S2O82-/Sb2O3/La3+.以催化合成乙酸苄酯为探针反应,考察了不同制备条件对催化剂性能的影响.结果表明,1.5 mol/L的(NH4)2S2O8和2.71% La(NO3)3混合溶液浸渍锑前体氧化物,经110℃烘干后,于500℃焙烧3h所得催化剂(SSL2.71-3-500)活性较好.同时,考察了催化剂的稳定性以及对不同酯化反应的作用规律.用Hammett,IR,DTA/TGA,XRD等手段对催化剂进行了表征.     

Sb3+-Cl-H2O体系中三氯化锑水解平衡的研究

研究了pH、NaCl浓度对三氯化锑水解的影响.结果表明:随着总氯离子浓度的增加,溶液中的锑离子浓度显著增加,并且三氯化锑水解产物由易到难顺序依次为Sb4O5Cl2、SbOCl、Sb2O3、Sb(OH)3.D当加入的总氯离子浓度＜6mol/L时,其与锑离子的配合导致平衡时溶液中所含锑离子浓度也显著增加.当总锑离子浓度一定时,随着pH的增加,平衡时溶液中所含锑离子浓度减少.