共查询到20条相似文献,搜索用时 109 毫秒
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低成本白炭黑生产工艺 总被引:1,自引:0,他引:1
在白炭黑的生产成本构成的中,原料水玻璃约占45-50%,以石英砂和烧碱的原料,采用法不玻璃,再用此水玻璃生产白炭黑,可使生产成本大幅度下降,用硫酸法生产,可降低成本700元/T左右;用碳酸氢铵法生产,可降低成本1000元/T左右。碳地生产成本低是因为可以副产纯碱和氨气,原料综合利用好,以湿法水玻璃和硫酸为原料,所制得的白炭黑产品质量完全符合国标要求。 相似文献
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水玻璃—矿渣水泥的水化性能研究 总被引:22,自引:4,他引:22
用DTA,FT-IR,TMS-GC法等综合研究了水玻璃-矿渣水泥的强度和水化性能,发现该水泥强度发展有反复,并且水玻璃对矿渣的激发作用有双重性。玻璃态矿渣必须先解聚再水化。 相似文献
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为满足生产、贸易和施工的要求,亟需建立快速、简洁、有效的方法测定钾水玻璃二氧化硅的含量。采用氟硅酸钾容量法对钾水玻璃中二氧化硅的测定进行了研究分析,结果表明:该方法具有设备简单、易操作、准确度高等优点,可用于钾水玻璃中二氧化硅含量的有效测定。通过实验原理、实验过程和实验条件的讨论,为实验室测定二氧化硅含量提供了一个切实可行的方法,与重量法相比,该方法提高效率30倍以上。除此之外,该方法可在20 min之内得到结果,方便、快捷、易于推广。 相似文献
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概述烧碱法生产氯氧化锆含硅废碱水的处理现状,介绍综合利用含硅废碱水制造水玻璃的方法,该法具有良好的经济和社会效益。 相似文献
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从几种常用自硬砂制芯造型工艺技术现状、工艺成本的角度出发,将几种常用自硬砂(即呋喃树脂自硬砂、碱酚醛树脂自硬砂、Pep-set法自硬砂、酯硬化水玻璃自硬砂),进行对比分析,列出了几种常用自硬砂在铸造质量、工艺技术、工艺成本、劳动条件以及环境保护方面的优势与劣势。同时重点介绍了酯硬化水玻璃自硬砂的优点。 相似文献
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针对酯硬化水玻璃砂混砂造型工序中,水玻璃(Na2O·mSiO2·nH2O)与有机酯固化剂(R—COOR’)作用,生成有机酸钠(R—COONa)、有机醇(R’-OH)、硅溶胶(mSiO2·nH2O),进而在浇铸及焙烧过程中,大部分分解为氧化钠(Na2O)和石英(SiO2)残留在旧砂中,非常容易引起滤袋堵塞,对除尘系统的运... 相似文献
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淀粉接枝/硅酸钠复合凝胶体系的制备及封堵性能评价 总被引:1,自引:0,他引:1
对淀粉与丙烯酰胺的接枝共聚反应进行了研究,确定了反应条件后,再加入硅酸钠-USC(成胶控制剂)溶液,反应10 h后最终形成了一种有机-无机复合凝胶。流变性实验结果表明,体系中加入硅酸钠后,其储能模量和耗损模量均大于原接枝体系。相同条件下,复合凝胶材料的柔量低于淀粉接枝体系,即其形变能力较差;随着温度的增加,复合凝胶的柔量降低,体系的形变能力随温度变化较敏感。封堵实验结果表明,不加硅酸钠的接枝共聚物对填砂管的封堵率达到97%,而复合凝胶材料的封堵率达到99.9%。这是由于硅酸钠凝胶的存在,增加了凝胶自身强度,生成的凝胶与岩石颗粒有一定的粘接力,从而明显提高了体系的封堵强度。 相似文献
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为了提取利用赤泥中的硅元素,实现赤泥的资源化,同时为水玻璃的制备寻找一种新原料。本文以中铝山西新材料有限公司两组分赤泥为研究对象,通过化学分析法、XRD对赤泥进行了化学组成及矿物组成分析。表明该赤泥中二氧化硅含量较高且都为非晶态,反应活性高,为制备水玻璃的理想硅源。对赤泥进行酸浸可得到纯度为92%的硅胶。硅胶湿法制备水玻璃最佳工艺参数为NaOH质量浓度15%,液固质量比3,体系温度95 ℃,反应时间为15 min。经实验验证,最佳参数下的二氧化硅溶出率可达91%,对该赤泥中硅的利用率达84.6%。该研究可为赤泥资源化和水玻璃原料选取提供新的思路和依据。 相似文献
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C. K. Lee L. S. Dent Glasser 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1975,25(6):427-440
Sodium silicate solutions with silicon dioxide: sodium monoxide mole ratios of 3.41 : 1 and 3.98 : 1 were dried to form gels. Some conductance studies were carried out on the sodium silicate as it dried, and when the dried material was heated up to 160 °C. The results suggest that conduction is mainly due to sodium ions both in the solution and in the gel; to this extent the mechanism of con, duction is similar to that in sodium silicate glasses. However, the gel has a much higher conductance than a glass of similar Na2O : SiO2 ratio, and this is probably because the gel contains hydroxyl ions and hydrated silicate ions, whereas the glass does not; moreover, the gel has a much less tightly packed structure than does the glass. 相似文献
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为了得到碱渣-粉煤灰-硅酸钠溶液体系新型注浆材料各组分的作用和固化机理,考虑不同固体质量配比和养护条件,通过温度变化、固化收缩、抗压强度和傅里叶变换红外光谱试验对比研究不同体系的差别.结果表明:碱渣中Ca(OH)2和粉煤灰中的CaO遇到硅酸钠溶液时发生放热反应;浆液早期抗压强度由碱渣中CaCl2、Ca(OH)2和CaSO4与硅酸钠溶液反应生成水化硅酸钙凝胶决定,由于粉煤灰受碱激发生成了硅铝酸盐聚合物凝胶使得注浆液7~50 d抗压强度有大幅增长;FTIR试验证实了水化硅酸钙凝胶(C-S-H)和硅铝酸盐凝胶(N-A-S-H)的存在;原材料组分保证了浆液收缩程度小、流动性好、不易离析、结石率大等优点. 相似文献
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This work explains the elastic properties of the reactive suspensions of metakaolin in sodium silicate solutions immediately after mixing. The flow properties of the interstitial fluid were obtained by mimicking it with synthetic aluminosilicate gels of different Si/Al molar ratios. By comparing these results with the rheological properties of fresh geopolymer pastes and with the ones of unreactive suspensions, we showed that the early age mechanical properties of geopolymer mixes cannot be explained by the colloidal interactions between metakaolin grains but rather by the formation of a gel with a molar ratio Si/Al < 4.5. In addition, we measured the evolution of the total concentration of tetrahedral Al in the interstitial liquid by static NMR. It was thus evidenced that the afore-mentioned aluminosilicate gel is formed at a very early stage of the geopolymerisation reaction resulting in a heterogeneous suspension with an Al-rich gel formed at the grain boundaries. 相似文献
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本文使用正交试验法,研究了富镁镍渣与粉煤灰的质量比、复合碱激发剂(水玻璃-Na2CO3)掺量及水胶比对富镁镍渣-粉煤灰基地质聚合物力学性能的影响,通过XRD、SEM、EDS及TG等测试方法对水化产物进行表征。结果表明,最优试样28 d抗压强度可达37.50 MPa。XRD结果显示,7 d与28 d的水化产物中含有水化硅酸钙凝胶,结合SEM、EDS分析可知,产物中还有菱沸石(N-A-S-H)与钠镁硅铝酸盐(N-M-A-S)无定形凝胶相,这些凝胶相是地质聚合物强度增加的主要原因。 相似文献
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Sodium silicate-based, alkali-activated slag mortars: Part I. Strength, hydration and microstructure
Alkali activation of ground granulated blast furnace slag (GGBFS) with sodium silicate gave clinker-free binders, with high strength and early strength development, although set times were short and somewhat variable. Isothermal calorimetry detected three heat evolution peaks (wetting, gelation of activator and bulk reaction of slag). X-ray diffraction (XRD) showed no crystalline products. Hydration was investigated by scanning electron microscopy (SEM; with quantitative image analysis) and 29Si magic angle spinning nuclear magnetic resonance (MAS NMR). From early age, a uniform gel filled the initially water-filled space, and gradually densified as reaction proceeded. Microanalysis of outer product (OP) showed an Al-substituted C-S-H gel phase of widely variable (0.5-1.0) Ca/Si ratio. NMR showed long-chain substituted C-S-H with Al/Si ratio rising to 0.19 at 1 year, and also cross-linked material, consistent with a Ca- or Al-modified silica gel. Inner product (IP) regions around slag grains probably also contained hydrotalcite. Activation with KOH gave more rapid reaction of slag than for silicate activation, a less homogeneous microstructure, and lower strengths. The hydrates contained a substituted C-S-H gel of low Ca/Si ratio probably mixed with hydrotalcite, and occasional higher Al regions in the OP regions. 相似文献