Application of ferrous-hydrogen peroxide for the treatment of H-acid manufacturing process wastewater

1-Amino-8-naphthol-3,6-disulfonic acid (H-acid) is widely used in chemical industries for synthesis of direct, acid, reactive and azoic dye. The wastewater from H-acid manufacturing process is rich in various substituted derivatives of naphthalene and is one of the most hardly-treated wastewaters. A pretreatment method, ferrous ion-peroxide oxidation combined with coagulation, has been studied. The results have shown that the optimum pH value is below 4 and the suitable ferrous ion dosage is 200 mg/l. The COD removal of H-acid wastewater is about 50% and the residue have proved biodegradable when hydrogen peroxide dosage is 30 g/l. Ferrous ion-peroxide oxidation process can also improve efficiency of coagulation treatment. The overall COD removal can reach 90% or more when the concentration of ferrous ion is 200 mg/l, the dosage of hydrogen peroxide is 3 g/l and the ferric chloride dosage of two stage coagulation treatment is 15 g/l and 5 g/l, respectively. The groups on naphthalene ring, such as − + NO₂, SO⁻₃ etc., are substituted by hydroxyl free radical, and then the ring is broken down during oxidation process of H-acid.     

FeCl_2·2H_2O焙烧过程动力学研究

用固定床研究了FeCl_2·2H_2O焙烧过程的动力学行为,变量包括温度、物料颗粒尺寸、气流速度和气流中含水量,讨论了过程的控制步骤,估算了表观反应速率常数和表观活化能,并用热分析校核了结果.     

碱性铁盐缓冲水溶液脱硫法原理

为消除气体中硫化氢对人类及生态环境的危害和对工业生产的影响,提出用氢氧化铁（亚铁）的“醋酸─醋酸钠（钾）－氨”的缓冲水溶液,在对苯二酚或水杨酸的催化下,脱除气体中的硫化氢、少量二氧化碳和部分氧气;脱硫液自动再生,产生单质硫.脱硫后气体中硫化氢含量可降至1.52mg·m~(-3)以下,成本低,操作稳定,腐蚀轻,无环境污染．同时,建立了相应的数学模型,经实验验证,实验结果与数学模型基本符合．     

亚铁离子对磷化膜质量影响的研究

研究了常温锌系磷化液中亚铁离子含量对磷化过程及磷膜性能的影响。当磷化液中亚铁离子含量为０．３－２ｇ／Ｌ时,可获得质量满意的磷膜层。并探讨了亚铁离子的作用机理。     

谈钛白生产几个工序的技术改造

在钛白装置的技术改造中,应将技术含量与经济两者有机地结合在一起。笔者比较了国内外钛白生产的工艺差异,就硫酸亚铁结晶、钛液浓缩和常压水解工序的技术改造谈谈自己的看法,并提出了分步实施的技术改造思路。     

常温多功能黑色金属表面处理液的研制

以H3PO4、ZnO及H为主要原料,制得了一种常温下应用的多功能钢铁表面处理液．其性能指标达到了GB／T12612－90要求,并讨论了其作用机理．     

无机高分子混凝剂聚合氯化铁的合成方法

作者着重介绍了氮氧化物为催化剂,以填料塔为反应器,以钢铁酸洗废液或铁悄为含铁原料合成聚合氧化铁工艺。同时对于该气液反应的机理,影响因素,解决措施进行了讨论。     

有色金属铸件有效浇注时间计算公式探讨

重点阐述了铝、铜合金铸件生产中较常应用的五种浇注时间计算公式的特点和存在的不足,分析了这几种公式在各自的材质铸件使用范围内出现的缺点及不足。研究及阐述了铝、镁合金和铜、锌合金铸件各自的通用有效浇注时间计算公式,及其良好的适用性和宽阔的适用范围。     

铝及铝合金在亚铁盐溶液中电解着色

铝及铝合金在含有2g/L的SB添加剂的150~180g/LH2SO4溶液中进行阳极氧化,得到多孔且无阻挡层的氧化铝膜。该膜在含有FesO4的溶液中进行交流电解着色,得到系列棕色膜。关键词##4铝;;阳极氧化;;电解着色;;硫酸亚铁;;棕色膜     

Effects of Various Viscosity Enhancers and pH on Separating Haem from Porcine Red Blood Cells

Haem derived from animal blood is a valuable source of organic iron which may be used as a supplement in foods. The purpose of this study was to examine the effects of sodium carboxymethyl cellulose (NaCMC), propylene glycol alginate (PGA) and sodium alginate (SA) as viscosity enhancers on the separation of haem from porcine red blood cells, and on the distribution of iron between the haem and non-haem fractions of the extracts. Iron determinations were carried out spectrophotometrically on the supernatants obtained by centrifuging the cell suspensions and on two successive washings of the cells. In the first washings the total extracted iron content using NaCMC was highest when a high-viscosity grade was used; there were no significant differences (P>0·05) between the results obtained with this material and those obtained using PGA or SA. There were also no significant differences (P>0·05) among the three treatments in terms of non-haem content. The absorbances at 540nm of the first washings were lower when the washing was carried out at pH 1·4 rather than at pH 1·0 or 2·0. There were no significant differences associated with changes in the viscosity enhancer in the absorbances of the second washings, but the absorbances at pH 1·4 were generally higher than those at pH 1·0 or 2·0. Enhancement of the absorbances on the addition of 1,10-o-phenanthroline indicated that the extracted iron was present in the ferrous form.