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在烧结矿工业生产中,原料在还原气氛下加热,然后在氧化气氛下冷却。为了研究气氛在烧结工艺中的作用,试验选用含工业铁矿粉、石灰石、石英及高岭土的小压块作为试样,在控制气氛的条件下,观察气氛,加热温度及冷却条件对于烧结矿中矿物生成的影响。试验结果概述如下: 在烧结试验加热阶段,氧从分压下降时,磁铁矿含量增加,赤铁矿含量减少。铁酸钙含量在低烧结温度(1210℃)下也会减少。但是,在较高烧结温度(1255℃)和中等氧位(5×10~(-3)大气压)条件下,可生成最大数量的铁酸钙。在用空气冷却阶段,磁铁矿可与熔态硅酸盐及氧发生反应,生成大量柱状铁酸钙。试样在混合气体(CO=1％,CP_2=24％,N_2=75％)中加热4分钟至1255℃,然后在空气中缓慢冷却,能很好地模拟生成普通工业烧结矿中由柱状铁酸钙、粒状磁铁矿晶粒和玻璃硅酸盐组成粘结相的典型显微结构。
In the sinter industry, raw materials are heated in a reducing atmosphere and then cooled in an oxidizing atmosphere. In order to study the role of atmosphere in the sintering process, small iron blocks containing industrial iron ore powder, limestone, quartz and kaolin were selected as samples to observe the atmosphere, the heating temperature and the cooling conditions in the controlled atmosphere, The impact of mineral production. The results of the test are summarized as follows: During the heating stage of the sintering test, the oxygen content decreases and the hematite content increases as the partial pressure of oxygen decreases. The calcium ferrite content also decreases at low sintering temperatures (1210 ° C). However, at the higher sintering temperatures (1255 ° C) and moderate oxygen levels (5x10 -3 atmospheric pressure), the maximum amount of calcium ferrite can be generated. In the air-cooled phase, magnetite reacts with molten silicates and oxygen to produce large amounts of columnar calcium ferrite. The samples were heated in a mixed gas (CO = 1%, CP_2 = 24%, N2 = 75%) for 4 minutes to 1255 ° C and then slowly cooled in air to simulate the formation of columnar iron Typical microstructures of the binder phase consisting of calcium carbonate, granular magnetite grains and glass silicates.