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我公司生产线配套使用的石灰石矿山地质构造较为复杂,各品位石灰石错综复杂,黏土夹层随处可见,低品位高硅石灰石储量较大,石灰石质量控制已经成为影响生产的重要因素。公司与时俱进地改变开采模式,扩大现有矿山开采层面,并对矿区石灰石质量分级划分,分析研究制订合理的矿山开采计划,运用先进理念匹配合理开采方案和工艺、优化质量控制等措施,充分消化使用这部分高硅石灰石,由此提高企业的经济效益和社会效益。 相似文献
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浅谈低钙高镁石灰石在预分解窑的应用 总被引:1,自引:0,他引:1
我公司1000t/dΦ3.2m×46m预分解窑生产线于1995年10月投产,采用石灰石、型砂、粉煤灰和铁粉四组分配料。其中,石灰石为自备矿山开采,储量丰富,但因石灰石矿构造较复杂,矿石夹层较多,不易剔除,造成石灰石品位较低,且不稳定,但因用量不大,在开采过程中,可进行适度挑选搭配,入磨石灰石品 相似文献
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水泥生产中,作为主要原料的石灰石是决定水泥产品质量好坏的一个重要因素。理想的原料石灰石,应该是硅含量较低,氧化钙含量较高的石灰岩。因此,对硅含量较高的石灰岩,1984年以前,我厂都是作为建筑石料处理的。这对矿山资源的综合使用以及全面按层次开采,带来很多不利因素,直接影响经济效益。为此,我们在1984年就开始用高硅低铝栖霞灰岩作小样试验,几年来,通过实践证明:高硅低铝栖霞灰岩经过适当处理,完全能作为生产优质水泥的主要原料。下面谈谈我们利用高硅低铝石灰石的体会。 相似文献
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朝阳水泥厂1200t/d生产线的中3.2m×50m回转窑配置Φ4m×26m低压损MFC分解炉。距厂区2km处有一座储量相当大的石灰石矿山,由于高镁高硅,一直没有水泥厂完全使用其生产,当时在建此水泥厂前我们也做了充分的论证和研究,现将调试生产过程中遇到的问题和采取措施介绍如下。 相似文献
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高硅石灰石生产水泥一直是企业的难题之一。目前,利用高硅石灰石生产高质量水泥在我公司已获成功,本文就高硅石灰石配料稳定生产425#R、525#R普通水泥情况作介绍。 相似文献
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矿山质量发生变化,石灰石SiO2含量高,导致生产困难。通过在矿山开采、生料配料、熟料煅烧等环节加强管控与技术创新,不需外购石灰石,全用自有矿山高硅石灰石(SiO2含量12%)配料,能够稳定生产熟料硅酸率达到3.1左右的优质硅酸盐水泥熟料(3 d抗压强度29.0 MPa,28 d抗压强度59.0 MPa)。 相似文献
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高镁石灰石在窑外分解窑的应用实践 总被引:1,自引:0,他引:1
0引言水泥中MgO的含量过高将对水泥安定性及强度产生不良影响。对于窑外分解窑来说,生料中过高的MgO含量还会给生产带来较传统生产工艺更大的困难。水泥生产中MgO主要来源于石灰石中的MgCO3,受水泥生产及质量控制的要求,水泥企业应当尽可能使用那些高钙低镁石灰石,这对于石灰石 相似文献
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Rheology of cementitious paste with silica fume or limestone 总被引:1,自引:0,他引:1
The rheological behaviour of cementitious pastes where cement has increasingly been replaced by densified silica fume (SF), untreated SF or limestone has been studied. The effect of SF on the flow resistance, taken as the area under the flow curve, was found to depend on the dispersing ability of the plasticizer as illustrated by pastes with naphtalene sulphonate-formaldehyde condensate (SNF) and polyether grafted polyacrylate (PA).The gel strengths increased with increasing SF replacement of cement independently of plasticizer type. The cementitious gel strength was, however, depending on the type of SF since pastes with densified SF developed lower gel strengths than pastes with untreated SF. This phenomenon was attributed to agglomerates in the densified SF which remained unbroken by the mixing and measurement sequence.Both flow resistance and gel strength decreased with increasing limestone replacement. Thus, silica fume may have an advantage over limestone filler as stabilizing agent for self-compacting concrete preventing segregation upon standing and reduced form pressure due to a more rapid gel formation. 相似文献
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Rashita Abd Rashid Roslinda ShamsudinMuhammad Azmi Abdul Hamid Azman Jalar 《Ceramics International》2014
This paper describes the behaviour of bioactive wollastonite materials containing Malaysian limestone and silica sand. Wollastonite, which is also known as calcium silicate (CaSiO3), is an industrial mineral composed of calcium, silicon and oxygen. Pseudowollastonite, which is a primary crystal of wollastonite, was synthesised via a solid-state reaction at a temperature of 1450 °C. The in-vitro bioactivity of wollastonite was examined by soaking it in simulated body fluid (SBF) solution for 1–7 days at 36.5 °C. The soaked wollastonite samples were characterised using XRD, SEM-EDX, FTIR and ICP analyses. Apatite particles precipitated on the surface of the wollastonite sample after the sample was soaked in the SBF. The XRD analysis indicated the presence of an increasing amount of the hydroxyapatite phase as the soaking time increased. The SEM and EDX analyses indicated the formation of granules of agglomerated apatite particles on the surface of the soaked wollastonite sample. During the formation of apatite, phosphate ions from the SBF solution were consumed. This process was confirmed by ICP, which revealed a decrease in ion concentration after the soaking process. The FTIR analysis indicated that the peaks of the phosphate ions increase when the apatite layer forms on the surface of the wollastonite sample. After the soaking process, a calcium deficient hydroxyapatite layer was observed on the wollastonite sample. The study concludes that wollastonite produced from Malaysian limestone and silica sand is bioactive and may be used as an implantable biomaterial. 相似文献
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一种高硅沸石与河沙的化学成分十分相近,两次高硅沸石替代河沙配料试磨和窑上试烧的结果表明:高硅沸石配料既利于粉磨又利于煅烧,完全可以替代河沙配料生产优质水泥熟料。高硅沸石质量成分稳定,碱等有害成分较低,储量丰富、价格便宜,增产节能效果十分突出。 相似文献
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