硫铁矿沸腾炉内蒸发管组防磨技术的探讨

为减少磨损,沸腾炉内蒸发管采用加焊半圆形钢板防磨.探讨了沸腾炉内蒸发管加焊半圆形钢板的防磨机理.实际使用情况表明,加焊半圆形钢板防磨大大降低了维修费用,显著提高了防磨效果.     

粉煤灰基混凝剂的制备及在大麻废水中的应用

采用酸溶法以粉煤灰为基础原料 ,通过添加一定量的硫铁矿烧渣 ,制备成粉煤灰基复合混凝剂 ,确定了最佳工艺条件 .实验结果表明 ,影响混凝剂制备的主要因素是粉煤灰与硫铁矿渣的质量比、酸用量、浸取时间和温度 .此混凝剂对大麻废水中 CODcr去除率达 88% ,色度去除率可达 96.6%以上 ,具有沉淀快和污泥体积小等优点 .     

滴加法制备铁黄颜料工艺研究

采用滴加法制备铁黄颜料，即采用硫铁矿烧渣直接制得的硫酸亚铁及硫酸亚铁结晶母液为原料。用空气作氧化剂，用氨水作沉淀剂制品种；在二步氧化中滴加氨水和硫酸亚铁结晶母液。探讨了亚铁浓度、空气流量等对晶种形成的影响，以及晶种比、空气流量、溶液pH、硫酸铵浓度等因素对铁黄生成的影响。确定了晶种制备和二步氧化的最佳工艺条件，即二步氧化中溶液pH控制在2．5～3．5，亚铁浓度控制在0．18～0．25mol／L的范围。检测结果表明：铁黄各项指标均达到原化工部HG／T2249--1991一级品标准。     

Modification of oxidizing activity of Thiobacillus ferroxidans by some particulate solids

Different particulate solids such as glass powder, various types of activated carbon and bentonite suspended in Thiobacillus ferrooxidans cultures produce very different effects on the oxidizing activity of the microorganism. The atmospheric oxygen uptake by Thiobacillus ferrooxidans in Warburg respirometer flasks containing 9K medium with ferrous sulfate as energy source and suspended bentonite is 2.8 times that in the absence of solids. The dissolution rate of pure pyrite in 250 cm³ shake flasks containing 9K medium and bentonite is considerably enhanced over that where the only solid phase is pyrite. Conversely, the oxidizing ability of the microorganism seems to be inhibited by all the activated carbons tested. The effect of ground glass seems to be related to its particle size distribution. Implications for the bioleaching of sulfide ores and coal pyrite are discussed in the light of current knowledge on the adsorption of Thiobacillus ferrooxidans cells on solid surfaces.     

乌达矿区煤中黄铁矿的赋存特点及其可选性评价

对乌达矿区高硫煤（９煤层和１０煤层）中硫的主要赋存形式－黄铁矿进行了研究，从宏观和微观两方面分析了黄铁矿的形态、嵌布类型及粒度特征，最后提出了降脱煤中黄铁矿的技术途径，对其可选性进行了评价。     

促进我国硫铁矿制酸的发展

我国硫磺制酸原料主要依赖进口,大量进口硫磺已经影响到世界硫磺的供需关系,硫磺价格居高不下.硫铁矿是我国自有资源,可保证长期、稳定的供应,对我国硫酸工业的稳定和安全具有重要作用,我国发展硫铁矿制酸有其必要性.硫铁矿制酸实现大型化;采用高品位硫铁矿制酸,有效利用铁资源和热能;实现清洁生产,减少废水排放、尾气二氧化硫排放及综合利用废热,是发展方向.抓住硫酸需求增加的机遇,采用先进技术发展硫铁矿制酸,硫铁矿制酸一定会有良好的发展前景.     

Oxidation of pyrite in coal to magnetite

When bituminous coal is heated in an inert atmosphere (He) containing small amounts of oxygen at 393–455 °C, pyrite (FeS₂) in coal is partially converted to magnetite (Fe₃0₄). The maximum amount of Fe₃0₄ formed during the time of heating corresponds to 5–20% of the total pyrite present, depending on the coal sample. The magnetite forms as an outer crust on the pyrite grains. The fact that the magnetic properties of the pyrite grains are substantially increased by the magnetite crust suggests that pyrite can be separated from coal by use of a low magnetic field. In a laboratory test, 75% removal is obtained by means of a 500 Oe magnet on three samples, and 60% on a fourth sample.     

硫铁矿烧渣制高纯氧化铁红的研究

研究了以广东云浮硫铁矿烧渣经浮选法制得的铁红五级品为原料,采用化学絮凝法除二氧化硅,制取高纯度的氧化铁红的工艺技术。其过程主要包括:硫酸亚铁的合成,絮凝除二氧化硅等杂质,碳酸亚铁的合成,后处理。考察了制备过程中,氨水的加料次序、pH、反应温度和时间、搅拌速度等因素对产品收率和纯度的影响。结果表明,所得产品三氧化二铁质量分数为99.45%,二氧化硅质量分数<0.0096%。产品可用作软磁铁氧体的原料。     

Preparation of solid polyferric sulfate from pyrite cinders and its structure feature

1　INTRODUCTIONCoagulationisanessentialprocessintheoverallsolid liquidseparationschemeinwaterandadvancedwastewatertreatment .Hydrolyzingmetalsalts ,suchasferriccoagulants ,canpromotetheformationofag gregates.WhenFesaltsaredissolvedinwater,themetalironhydrates ,coordinatingsixwatermoleculesandforminganaquometalion ,canthenhydrolyzeandformmonomericand polymericferricspecies ,whichishighlydependentonpHofthesolution .Itispossibletodescribetheformationofseveralhydrolysisspecies ,suchaspositiv…     

REACTIONS OF PYRITE IN CATALYTICAL OXIDATION ACID LEACHING SYSTEM

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