硫酸铁盐对干法氧化铁红颜料质量的影响

本文研究了在不同反应条件下制备出的硫酸铁盐对干法氧化铁红颜料质量的影响 ,特别是在色相、水溶物、pH等方面 ,并给出了最佳反应条件。

不同反应条件制备出的硫酸铁盐对干法氧化铁红颜料质量影响的研究

研究了在不同反应条件下制备出的硫酸铁盐对干法氧化铁红颜料质量的影响，特别是在色相，水溶物、ＰＨ等方面，并给出了最佳反应条件。

(调酸-冷冻结晶)法治理钢材硫酸酸洗废液工艺研究

目前世界钢铁工业中的硫酸酸洗液处理方法(回收,综合利用)主要有中和回收法,硫酸铁盐法,以及有机溶剂萃取法,渗析法,离子交换法等等。有机溶剂萃取法,离子交换法,渗析法等大都尚在试验阶段。针对硫酸酸洗废液成份,从我国国情出发,我们对“调酸-冷冻结晶”这一新方法进行了研究。

妙语天成──关于俄语成语中的БЕЛЫЙ，ЧЁРНЫЙ，КРАСНЫЙ，3ЕЛЁНЫЙ

妙语天成──关于俄语成语中的БЕЛЫЙ，ЧЁРНЫЙ，КРАСНЫЙ，３ЕЛЁНЫЙ首都师范大学外语学院刘少华颜色可以说是人类接触大自然的第一表象。当人类对声、光、电等物质的本质尚一无所知之时，视觉器官就受到了大自然色彩的强烈刺激。这种刺激必然对人类...

Effect of arsenopyrite on thiosulfate leaching of gold

Arsenopyrite was artificially added into the thiosulfate leaching solution to clarify the role of arsenopyrite on the thiosulfate leaching of gold.The effect of arsenopyrite on the thiosulfate leaching of gold was studied by the thermodynamic calculation,mineral dissolution test,leaching test and XPS analysis.The results show that the thiosulfate consumption slightly increases with increasing the concentration of arsenopyrite,but the gold dissolution is obviously hindered.This may mainly attribute to the catalytic effect of arsenopyrite on the thiosulfate decomposition and the formation of passivation layer on the gold foil surface.The passivation layer likely consists of Cu2S or Cu（S2O3）35-,element S,FeOOH and iron arsenate,which is deduced from the XPS analysis.However,the negative effect of arsenopyrite can be eliminated by adding additives.It is found that both additives of sodium carboxymethyl（CMC） and sodium phosphate（SHPP） can not only decrease the thiosulfate consumption but also improve the gold dissolution.

滑动床层脱硫塔的研制

改进后的滑动床层脱硫塔的特点是，塔体填料分层，填料卸料定时定量，滑动更换床层，气固相内外扩散均匀。避免了脱硫剂强度低、易压碎及结核之弊，利于大型工厂烟气脱硫。

Acid Release from an Acid Sulfate Soil Sample Under Successive Extractions with Different Extractants

An acid sulfate soil sample was successively extracted with deionized water, 1 mol L-1 KCl and 0.000 5 mol L-l Ca(OH)2 solutions. The results showed that only very small amounts of acidity were extracted by deionized water, possibly through slow jarosite hydrolysis. Acid release through jarosite hydrolysis was greatly enhanced by Ca(OH)2 extraction at the expense of the added OH- being neutralized by the acid released. Successive extraction of the sample with KCl removed the largest amounts of acidity from the sample. However, it is likely that the major form of acidity released by KCl extraction was exchangeable acidity. The results also show the occurrence of low or non charged Al and Fe species in water and Ca(OH)2 extracts after first a few extractions. It appears that such a phenomenon was related to a decreasing EC value with increasing number of extractions.

Effect of chelating agent on oxidation rate of aniline in ferrous ion activated persulfate system at neutral pH

In the interest of accelerating aniline degradation, Fe2+ and chelated Fe2+ activated persulfate oxidations were investigated in neutral pH condition. Three kinds of chelating agents were selected including citric acid, oxalic acid and ethylenediamine tetraaceatate(EDTA) to maintain available Fe2+. The results indicate that the concentration of chelating agent and ferrous ion didn't follow a linear relationship with the degradation rate of aniline. A 1/1 ratio of chelating agent/Fe2+ results in a higher degradation rate compared to the results by other ratios. The oxidation enhancement factor using oxalic acid was found to be relatively low. In contrast, citric acid is more suitable chelating agent in the ferrous iron activated persulfate system and aniline exhibits a highest degradation with a persulfate/Fe2+/citric acid/aniline molar ratio of 50/25/25/1 compared to other molar ratios.

Formation of arsenic−copper-containing particles and their sulfation decomposition mechanism in copper smelting flue gas

The heat recovery steam generator(HRSG)of copper smelting generates a large number of arsenic−coppercontaining particles,and the in-situ separation of arsenic and copper is of importance for cutting off environmental risk and realizing resource recovery.The formation of arsenic−copper-containing particles was simulated,the method of in-situ decomposition of arsenic−copper-containing particles by pyrite was proposed,and the decomposition mechanism was confirmed.It was found that particles with high arsenic content were formed in the simulated HRSG,and copper arsenate was liable for the high arsenic content.Pyrite promoted the sulfation of copper,leading to the in-situ decomposition of copper arsenate.In this process,gaseous arsenic was released,and thus the separation of arsenic and copper was realized.

Sulfate-Exchange Alkalinity of Ferralsol Colloid

The amount of OH- replaced by sulfate, i.e., sulfate-exchange alkalinity, from the electric double layer of ferralsol colloid was measured quantitatively in different conditions with an automatic titration equipment.The amount of OH- release increased with the amount of Na2SO4 added and decreased with raising pH in the suspension of ferralsol colloid. The exchange acidity was displayed as PH was higher than 5.6. If the negative effect of sodium ions was offset, the amount of OH- replaced by sulfate was larger than the original amount of OH- released in the PH range of lower than 5.8. The amount of OH- released decreased rapidly as PH was higher than 6.0 and dropped to zero when PH reached 6.5. In the solution of 2.0 mol L-1 NaClO4, the amount of OH- replaced by sulfate from the surface of ferralsol colloid could be considered as the amount of OH- adsorbed by ligand exchange reaction. The amount of OH- released in the solution of NaClO4 concentration below 2.0 mol L-1 from which the amount o f OH- adsorbed by ligand exchange reaction was subtracted could be considered as the OH- adsorbed by electrostatic force. The OH- adsorbed by electrostatic force decreased with increases in the concentration of NaClO4 and PH and increased almost linearly with the increasing amount of Na2SO4 added. The percentages of OH- adsorbed by electrostatic force in water and in the electrolyte solutions of 0.05 and 0.5 mol L-1NaClO4 in the total OH- released were calculated, respectively.

Iron Monosulfide Distribution in Three Coastal Floodplain Acid Sulfate Soils, Eastern Australia

The distribution of iron monosulfide (quantified as acid volatile sulfur: SAV) was compared with geo- chemical properties that are known to affect its formation and accumulation in three coastal Holocene acid sulfate soils (ASS) at Tuckean Swamp, McLeods Creek and Bungawalbyn Swamp respectively. These properties included PH, reactive iron (FeR), pore-water sulfate (SO:42-) and organic carbon (OC). Iron monosulfide was concentrated at the oxic/anoxic boundary. The Tuckean Swamp and McLeods Creek sites are Holocene sediments, whereas the Bungawalbyn Swamp is a Holocene peat. The concentration of SAV averaged 0.2 g kg-l in a 0.5 m thick soil layer at the Tuckean Swamp, but was an order of magnitude lower in the oxic/anoxic transition layers at McLeods Creek and Bungawalbyn Swamp. The SAV mineral greigite (Fe3S4) was identified in the Tuckean Swamp by X-ray diffraction and scanning electron microscopy with quantitative energy dispersive X-ray analysis (SEM-EDX). Very small concentrations of greigite were also observed in the McLeods Creek, based on crystal morphology and elemental composition. The concentration of SAV was a small fraction of the total reduced sulfur, representing at most 3% of the Pyrite sulfur. However, the presence of this highly reactive sulfide mineral, distributed within pores where oxygen diffusion is most rapid, has important implications to the potential rate of acid production from these sediments.

Deterioration of concrete in railway tunnel suffering from sulfate attack

For the sake of understanding the deterioration behavior of concrete in actual railway tunnel structures subjected to aggressive sulfate medium in practice,detailed field investigations and tested analysis on sprayed concrete linings of approximately 40-year-old railway tunnels in environments containing sulfate ion were carried out,respectively.The results show that the deterioration of concretes in the investigated area is serious,which involves complicated physicochemical process between the sulfate salt and concrete.Among them,the secondary sulfateminerals such as gypsum formation under very high concentration sulfate ion condition by accumulating and evaporation process dominate,followed by the crystallization of sulfate salt and formation of thaumasite.

Impeded Acidification of Acid Sulfate Soils in an Intensively Drained Sugarcane Land

Recent research results suggest that acidification of acid sulfate soils may be inhibited in well-drained estuarine floodplains in eastern Australia by the absence of natural creek levees. The lack of natural levees has allowed the inundation of the land by regular tidal flooding prior to the construction of flood mitigation work. Such physiographical conditions prevent the development of pre-drainage pyrite-derived soil acidifica- non that possibly occurred at many levee-protected sites in eastern Australian estuarine floodplains during extremely dry spells. Pre-drainage acidification is considered as an important condition for accumulation of soluble Fe and consequently, the creation of favourable environments for catalysed pyrite oxidation. Under current intensively drained conditions, the acid materials produced by ongoing pyrite oxidation can be rapidly removed from soil pore water by lateral leaching and acid buffering, resulting in low concentrations of soluble Fe in the Pyretic layer, which could reduce the rate of pyrite oxidation.

Influence of Inorganic Salts during the Photooxidative Process of Nitrobenzene

Into the photooxidation process, several factors such as pH, time of irradiation, dose of UV light, lamp power, contaminant concentration, turbidity of the solution and the presence of salts can interfere with the photodegradation of pollutants. This research aims to evaluate the influence of salts： NaCl, MgCl2, CaCI2, BaC12, CuCl2, Na2SO4, MgSO4, MnSO4, FeSO4, CuSO4, Na3PO4, K2CrO4 and K2Cr207 in concentrations of 0.0005 M, 0.005 M and 0.05 M during photodegradation of aqueous solution of 59.5 mg/L of nitrobenzene at a pH of 2.5. It was observed that the presence of salts such as CuCI2, CuSO4, FeSO4, K2CrO4 and K2Cr207 interfere negatively in the system UV/H202 applied for degradation of nitrobenzene; possibly by oxidation of Fe2＋ to Fe3＋ and Cu＋ to Cu2＋ in the Cr case, due to the difficulty of transforming the Cr6＋ to Cr3＋ or because these solutions have color and act as radiation absorbing filter.

Study on the Magnetic Properties of MoFe_3S_4 Single Cubane-like Clusters Containing R_2dtc Ligands

Both cubane-like clusters MoFe_3S_4 (Me_2dtc)_5·2CH_2Cl_2 (1) and MoFe_3S_4(C_4H_8dtc)_5·2EtCN (2) were used to study the temperature-dependent behavior of the molar magnetic susceptibility. A spin coupling model was suggested and the fitting results agree with the model and structural and spectroscopic parameters.

上海山海工学团实验二厂

上海山海工学团实验二厂是一家专业生产铁盐试剂产品和精细化工等的企业。建于1986年。产品主要有三大类，20多个无机盐品种，销售覆盖全国10多个省市．硫酸铁盐（沥青添加剂）远销美国、西欧等地。本厂拥有试剂产品生产许可证，化工企业质量检验机构认证证书．本厂奉行“质量至上，信誉第一”的宗旨，以稳定的价格为广大用户提供优良的服务。

上海山海工学团实验二厂

上海山海工学团实验二厂是一家专业生产铁盐试剂产品和精细化工等的企业。建于1986年．产品主要有三大类，20多个无机盐品种，销售覆盖全国10多个省市。硫酸铁盐（沥青添加剂）远销美国、西欧等地．本厂拥有试剂产品生产许可证，化工企业质量检验机构认证证书．本厂奉行“质量至上，信誉第一”的宗旨，以稳定的价格为广大用户提供优良的服务。

上海山海工学团实验二厂

上海山海工学团实验二厂是一家专业生产铁盐试剂产品和精细化工等的企业。建于1986年。产品主要有三大类，20多个无机盐品种，销售覆盖全国10多个省市。硫酸铁盐（沥青添加剂）远销美国、西欧等地。本厂拥有试剂产品生产许可证，化工企业质量检验机构认证证书。本厂奉行“质量至上，信誉第一”的宗旨，以稳定的价格为广大用户提供优良的服务。

上海山海工学团实验二厂

上海山海工学团实验二厂是一家专业生产铁盐试剂产品和精细化工等的企业。建于1986年。产品主要有三大类，20多个无机盐品种，销售覆盖全国10多个省市。硫酸铁盐（沥青添加剂）远销美国、西欧等地。本厂拥有试剂产品生产许可证，化工企业质量检验机构认证证书。本厂奉行“质量至上，信誉第一”的宗旨，

浅析某工厂污水处理站含磷废水工艺调试

某工厂污水处理站设计采用石灰法为主的工艺来处理含磷废水。因原水中磷酸盐浓度及水量相较企业环评存在相当偏差,以及污水站除磷工艺的选择,使得实际运行中用石灰法除磷存在诸多问题。笔者在运行调试中采用投加聚合硫酸铁盐混凝沉淀的办法对原有除磷工艺进行优化,取得了不错的效果,以此解决了企业污水中磷酸盐排放超标的问题。