【作者】 王韬；

【导师】 罗立群；

【作者基本信息】 武汉理工大学 ， 矿物加工工程， 2010， 硕士

【摘要】 提高铁精矿品位对节约冶炼成本、提高冶炼质量有很大的好处,因此,目前的研究多专注于如何提高最终产出的铁精矿的品位上。对选矿效率的评价方法,也被这一观念引导,大多只从品位和回收率两方面来考察选铁工艺的优劣,国内外均不乏这类的选矿效率公式,如典型的汉科克公式、弗莱明公式等。上世纪80年代有人提出,金属工业也像其它工业一样,产品价格与市场需求的关系,比其与生产成本的关系更加密切。精矿产品的品位和回收率应根据最低生产成本来确定。作为大宗矿业产品的铁精矿,其铁精矿的销售价格随市场变化而波动,提铁降杂选矿厂的产品质量、生产量随产品价格的波动,其总体销售产值也发生变化,直接影响铁精矿生产企业的综合效益。如何根据市场的价格变化及时调整产品方案,联动调节铁精矿产品的铁品位与铁回收率、并控制生产成本,实现企业投资与生产铁精矿的效益最大化意义重大。笔者在氰化提金工艺经济效益评价理论体系的基础上,提出精矿产品的品位和回收率不仅应根据最低生产成本来确定,而更应该根据产生的经济效益来确定。本文以经济效益为中心,通过粗精矿品位、粒度、磨矿返砂比、磁选机磁场强度、浮选药剂用量等作为主体参数,采用LINEST函数,建立提铁降杂选矿厂的“选矿数学模型”(包括：“给料粒度／返砂比-破碎粒度”模型、“返砂比-处理量”模型、“给矿品位／粒度／磁场强度-磁精矿品位”模型、给矿品位／粒度／磁场强度-磁精矿产率”模型、“粒度／品位／药剂量-精矿品位”模型及“浮选精矿品位-浮选精矿产率”模型)和“经济效益计算模型”(包括：铁精矿毛利润模型、铁精矿生产成本计算模型及选矿厂净利润计算模型),分析在多变的市场环境下改变生产方案对企业经济效益的影响规律,最后通过计算比较不同生产方案的获利能力,并以此指导企业及时调整生产。利用“选矿数学模型”和“经济效益计算模型”,综合计算结果表明,在当前铁矿石市场价格(800元/t-1000元/t)环境下,对山西某提铁降杂独立精选厂应选择购买粒度-0.074mm为55%、铁品位(TFe)为52%的粗精矿进行生产,并同时将生产指标调整为磨矿返砂比3.0、磁选柱场强11 kA/m、苛性钠用量2500g/t、淀粉1400g/t、石灰450g/t、捕收剂850g/t,此时将能获得日纯收益63.2459万元的经济效益。更多还原

【Abstract】 It is good for reducing the cost and improve the quality of steel-making by upgrading iron concentrate, so most of researches had been concentrating on how to upgrading the iron concentrate. The evaluation methods of efficiency of concentration are misleaded by this position, the merits of a process is mostly assessed by the iron concentrate and the percent recovery of its process, such as the Hancock and the Flemyng. Rory Tibbals and Kim N.Unger put forward a view that thers is a more closely relations between prece and demand than the Metal Industries and the cost of production, just like other Industries. The grade and the percent recovery of iron ore concentrate production should be defined by the lowest cost.In the theoretical basis, the author puts forward a view that the grade and the percent recovery of iron ore concentrate should be depend on the maximized economy, not only the minimized cost.In this article, there are two mathematical models, ore dressing model and economy model, which are builded to analyze how the producing method influence the economy, and which are used to compute the ability of earning porfit, directing production.The results indicated that a cert iron ore concentrate factory should purchase TFe 52%, d55=0.074 mm rough concentrate,C=3.0, magnetic field strength 11 kA/m, NaOH 2500 g/t, SD 1400 g/t, Ca(OH)2450 g/t, LP-4850 g/t at the current market conditions, which can earn a profit of Y632459 eveyday.更多还原