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一种新型的链篦机—可控气氛回传窑直接还原法由艾利斯—查默斯公司试验研究中心进行广泛的试验以后已获得成功(该研究中心位于美国威斯康星州奥克刻里克地区)。该方法可以处理含铁和非含铁矿石。该方法由铁矿球团链篦机—回转窑工艺和ACCAR·铁矿还原法相结合而成。它由链篦机,回转窑(有或没有喷射口)和冷却器依次联接组成。造好的生球送到链篦机上进行干燥预热。预热过的球团矿在链篦机上达到足够的强度以后,直接给入回转窑内。固体燃料例如煤或其它还原剂可以在链篦机的卸料处加入,同球团矿一起进入回转窑内。在上面提到的具有喷射口的回转窑中,天然气、重油或其它液体燃料可通过喷射口进入窑内。焙烧过的球团矿从回转窑内卸出送至冷却机冷却。传统的铁矿球团和还原工艺分别在两个独立的装置上进行。球团装置将造球机造好的生球进行焙烧和冷却。然后将冷却过的球团矿送到还原装置回转窑或竖炉内。由于链篦机—可控气氛回转窑直接还原工艺的研究成功,球团装置中的冷却机被取消了,从而节省了基建投资并简化了工艺流程。同时由于热球团矿直接装入回转窑也节省了篦源。由于球团矿不需要再进行预热,因此可采用较小的回转窑。本文介绍了威斯康星州奥克刻里克地区艾年利斯—查默斯试验研究中心的试验情况。使用多种固体燃料(包括次烟煤、泥煤、褐煤)成功地进行直接还原铁矿石的实验室和半工业试验。
A Novel Grate-Controlled Atmosphere The kiln direct reduction method has been successful since extensive experimentation by the Ellis-Chalmers Experimental Research Center (Ochiric, Wisconsin, USA) area). This method can handle both ferrous and non-ferrous ores. The method is a combination of iron ore pellet grate rotary kiln process and ACCAR iron ore reduction process. It consists of grate, rotary kiln (with or without injection port) and the cooler in turn connected to form. Make a good ball sent to the grate dry preheat. The preheated pellets are fed directly into the rotary kiln after reaching sufficient strength on the grate. Solid fuels such as coal or other reducing agents may be added at the grate discharge to enter the rotary kiln along with the pellets. In the rotary kiln with injection ports mentioned above, natural gas, heavy oil or other liquid fuel can enter the kiln through the injection port. The roasted pellets are discharged from the kiln to the cooler for cooling. Traditional iron ore pellets and reduction processes are carried out on two separate installations. The pellet device roasts and cools the green balls made by the pelletizing machine. The cooled pellets are then sent to the reduction unit rotary kiln or shaft furnace. Due to the success of the direct reduction process of the grate-controlled atmosphere rotary kiln, the coolers in the pellet plant were eliminated, saving capital investment and streamlining the process. At the same time, the grate source is saved as a result of the direct charging of the hot pellets into the rotary kiln. Since pellets do not need to be preheated, smaller rotary kilns can be used. This article describes the trials of the Ai Nilith-Chalmers Test and Research Center at Oak Creek, Wisconsin. Laboratory and semi-industrial trials for the direct reduction of iron ore are successfully conducted using a variety of solid fuels, including sub-bituminous coal, peat and lignite.