The invention provides a skarn type magnetite tailings sintered porous brick and its preparing method, the main components of the porous brick is hedenbergite 75 ~ 85%, 7 ~ 11% Mg olivine, three calcium aluminate 3 ~ 5%, 1 ~ 3% free cristobalite, sodium ferric sulfate 1 ~ 3%, 2 ~ glass phase 4%. The preparation method is as follows: the skarn rock type magnetite tailings and particle size less than 3mm coal gangue with 70 ~ 75 to 25 ~ 30 of the mass percentage of mixed together, the tailings particle size less than 0.5mm, and more than 67% of the tailings particle size less than 0.074mm, the average particle size of tailings is 0.043 ~ 0.05mm, its viscosity grade content less than 15%, the tailings plasticity index is 8 ~ 12, 12 ~ 24 hours after mixing the stale stale; will good mud after vacuum plastic extrusion, preparation of porous brick series and drying to moisture content is less than 2%; the body will dry in 1110 to 1160 DEG C temperature firing from 26 to 28 for hours, the skarn type magnetite tailings sintered porous brick. The compressive strength of the porous brick is 20 ~ 35MPa, and the appearance and performance of the product can be up to the technical specification requirement of GB13544 2000.
【技术实现步骤摘要】
本专利技术提供一种,属于烧结多孔砖制备工 艺
技术背景矽卡岩型磁铁矿尾矿是铁矿石经过开采、选矿后的矿山废渣,其主要组成为钙铁辉石、 方解石、铁镁橄榄石、绿泥石、云母、黄铁矿、钠镁长石等矿物,烧失量小于"%。目前,国内对该类型尾矿的利用研究人多数停留在尾矿添加水泥、石灰,制造灰砂砖、 双免砖、或添加粘土制造烧结砖的水平上。因为砂卡岩型磁铁矿尾矿含钙、镁较高,同时含 有大量的绿泥石等易风化矿物,在水泥质的制品中发生碱骨料反应,同时存在严重的风化问 题,所以尾矿添加水泥、石灰所得到的灰砂砖、双免砖的耐久性很差。若通过高温烧结,使 原料发生固相反应,可以解决兔烧制品的耐久性问题。但由f该类原料的钙、镁、铁含量高, 由尾矿为原料制备烧结砖的烧成温度高(U50 117(TC),烧结温度范围只有2(TC,无法实现 工业生产。基于上述问题的存在以及其他因素的影响,目前还没有形成该类型尾矿的合理利 用技术,没有形成相应的产业,造成了尾矿的大量堆积,带来了严重的安全隐患和环境污染, 严重制约了矿山企业的可持续发展。
技术实现思路
本专利技术的目的是提供一种能解决上述问题、 ...
【技术保护点】
一种矽卡岩型磁铁矿尾矿烧结多孔砖,其特征在于多孔砖的主要成分按质量百分比为:钙铁辉石75~85%,镁橄榄石7~11%,铝酸三钙3~5%,游离方石英1~3%,硫酸钠铁1~3%,玻璃相2~4%。
【技术特征摘要】
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