铁尾矿粉热压成型类石板试验

Experiment of Hot-Pressing Molding Likeness Flagstone with Iron-Tailings Powder

探寻废弃铁尾矿粉再生利用的有效途径,将其制备成为消耗量大、附加值高的建筑型材是铁尾矿粉热压成型类石板材的根本目的。根据微晶玻璃的形成原理,使用鞍山式铁尾矿粉配制4种不同类型的混合粉料,4种配方中共同含有的主要化学成分为Al2O3、MgCO3、CaCO3、BaCO3、Na2CO3,分别在温度900～1 000℃、压力10～20MPa、升温时间5～8min、保温时间10～30min条件下在液压加压中频加热炉上进行热压成型试验,分别在室温和炉温自然冷却条件下冷却至室温。热压成型试验结果表明:合适的添加剂掺量和温度以及压力控制能够实现铁尾矿粉类石板的热压成型,最佳的热压成型温度范围为950～1 000℃,试样硬度与压力呈非线性关系,但当压力超过15MPa后试样的硬度明显提高。热压成型试样的最大硬度为HRC37。

The fundamental purpose of the experiment of hot-pressing molding likeness flagstones with iron-tailings powder is to seek an effective way of recycling abandoned iron-tailings powder and make it as the architectural profiles that have been massive consumed in construction markets and with high additional value.So the hot-pressing molding likeness flagstones have been experimented with iron-tailings powder based on the principle of glass-ceramic forming.Four types of mixed power have been used in the hot-pressing molding experiment.And the common component of the mixed power are iron-tailings powder,Al2O3、MgCO3、CaCO3、BaCO3 and Na2CO3.Using the hydraulic extrusion intermediate frequency heating furnace,they have been hot-pressing molded with in temperature range 900 to 1 000℃,in the pressure range 10 to 20 MPa,in temperature rising time range 5 to 8 minutes and in temperature holding time range 10 to 30 minutes.The samples of the hot-pressing molding with iron-tailings powder were cooled to room temperature inside the furnace or outside the furnace.The experimental results show that the iron-tailings powder can be used to make stone-like material by hot-pressing when added the suitable additives and tailor the temperature and pressure.The best temperature range is 950 to 1 000℃.The hardness of the made material has a nonlinear relationship with the pressure.When the pressure surpasses 15 MPa the hardness of the made material has obvious improvement.The most Rockwell hardness of all samples is HRC 37.