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Method for producing melted iron and aluminium oxide with high-iron bauxite

A high-iron bauxite and alumina technology, applied in the fields of alumina/aluminum hydroxide, improvement of process efficiency, furnace type, etc., can solve problems such as difficulty and high energy consumption, achieve production efficiency improvement, simplification of operation process, energy saving consumption reduction effect

Active Publication Date: 2015-11-25
NORTHEASTERN UNIV
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Problems solved by technology

This method is a good method for treating high-iron bauxite, but this method also has certain limitations, mainly as follows: (1) At present, there is no coal-based shaft furnace in China, and it will take a long time for industrial implementation (2) Due to the one-time addition of the flux, the flux is heated, cooled, and heated again for melting and separation, the energy consumption is still high; (3) The cooling rate of the calcium aluminate slag from slag discharge to room temperature in the whole process No more than 6°C / min, it is difficult for industrial operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 某高铁铝土矿TFe含量为34.68%,Al 2 o 3 的含量为23.85%,SiO 2 含量为7.16%,烧损为17.50%,剩余为其它杂质,其中,Al 2 o 3 with SiO 2 的质量比为3.33。

[0026] 热压用烟煤的固定碳含量为59.05%,灰分为11.00%,挥发分为29.09%,结合水为0.86%,灰分中Al 2 o 3 含量为45.16%,SiO 2 含量为21.91%。冶金石灰中CaO含量为85.00%,SiO 2 含量为5.00%,其它为10.00%。

[0027] 将上述高铁铝土矿加热至550℃脱去结晶水,然后破碎成粒度不大于0.15mm的粉体物料,同时将烟煤以及冶金石灰粉碎成粒度不大于0.15mm粉体物料。

[0028] 将高铁铝土矿矿粉、烟煤煤粉以及冶金石灰按照质量百分比为72.5%、14.8%、12.7%的比例混匀、加热、热压至350℃,从而热压成高铁铝土矿热压块,制成的热压块抗压强度为670N,碳氧摩尔比为1.0,碱度为1.0。

[0029] 将上述热压块装入到转底炉中进行金属化还原,还原区温度为1325℃,还原区的CO分压为76.2%,还原时间为15min,将还原产物从出料口排入到密闭容器中,还原产物的金属化率为91.2%。

[0030] 将冷却后的还原产物以及冶金石灰加入到电炉中进行熔化分离,熔分温度为1550℃,熔分时间为50min,终渣碱度控制为3.85,可实现铁与炉渣的分离,得到碳含量为4.20%的铁水以及铝酸钙炉渣,铁的回收率为97.60%。

[0031] 以10℃ / min的冷却速率将铝酸钙炉渣从1450℃冷却至1000℃,当温度低于1000℃时自然空冷,从而得到铝酸钙自粉渣,其中粒度小于0.074mm的部分占炉渣质量的92.26%。

[0032] 采用浓度为110g / L的Na 2 CO 3 Leaching Al from Calcium Aluminate Slag by Solution 2 o 3 ,浸出温度为80℃,浸出时间为100min,液固质量比为15:1,经过滤可得到浸出液和浸出渣;浸出液经结晶、干燥后可得到工业用Al 2 o 3 ,其浸出率为87.83%。

Embodiment 2

[0034] 某高铁铝土矿TFe含量为29.78%,Al 2 o 3 的含量为34.85%,SiO 2 含量为5.16%,烧损为16.40%,剩余为其它杂质,其中,Al 2 o 3 with SiO 2 的质量比为6.75。

[0035] 热压用烟煤的固定碳含量为59.05%,灰分为11.00%,挥发分为29.09%,结合水为0.86%,灰分中Al 2 o 3 含量为45.16%,SiO 2 含量为21.91%。冶金石灰中CaO含量为85.00%,SiO 2 含量为5.00%,其它为10.00%。

[0036] 将上述高铁铝土矿加热至500℃脱去结晶水,然后破碎成粒度不大于0.15mm的粉体物料,同时将烟煤以及冶金石灰粉碎成粒度不大于0.15mm粉体物料。

[0037] 将高铁铝土矿矿粉、烟煤煤粉以及冶金石灰按照质量百分比为75.04%、14.67%、10.09%的比例混匀、加热、热压至450℃,从而热压成高铁铝土矿热压块,制成的热压块抗压强度为710N,碳氧摩尔比为1.2,碱度为1.0。

[0038] 将上述热压块装入到转底炉中进行金属化还原,还原区温度为1300℃,还原区的CO分压为78.7%,还原时间为15min,将还原产物从出料口排入到密闭容器中,还原产物的金属化率为92.42%。

[0039] 将冷却后的还原产物以及冶金石灰加入到电炉中进行熔化分离,熔分温度为1550℃,熔分时间为40min,终渣碱度控制为4.42,可实现铁与炉渣的分离,得到碳含量为4.34%的铁水以及铝酸钙炉渣,铁的回收率为96.28%。

[0040] 以8℃ / min的冷却速率将铝酸钙炉渣从1450℃冷却至1000℃,当温度低于1000℃时自然空冷,得到铝酸钙自粉渣,其中粒度小于0.074mm的部分占炉渣质量的94.76%。

[0041] 采用浓度为110g / L的Na 2 CO 3 Leaching Al from Calcium Aluminate Slag by Solution 2 o 3 ,浸出温度为75℃,浸出时间为90min,液固质量比为15:1,经过滤可得到浸出液和浸出渣;浸出液经结晶、干燥后可得到工业用Al 2 o 3 ,其浸出率为90.80%。

Embodiment 3

[0043] 某高铁铝土矿TFe含量为31.32%,Al 2 o 3 的含量为25.76%,SiO 2 含量为8.62%,烧损为16.30%,剩余为其它杂质,其中,Al 2 o 3 with SiO 2 的质量比为2.99。

[0044] 热压用烟煤的固定碳含量为59.05%,灰分为11.00%,挥发分为29.09%,结合水为0.86%,灰分中Al 2 o 3 含量为45.16,SiO 2 含量为21.91%。冶金石灰中CaO含量为85.00%,SiO 2 含量为5.0%,其它为10.0%。

[0045] 将上述高铁铝土矿加热至500℃脱去结晶水,然后破碎成粒度不大于0.15mm的粉体物料,同时将烟煤以及冶金石灰粉碎成粒度不大于0.15mm粉体物料。

[0046] 将高铁铝土矿矿粉、烟煤煤粉以及冶金石灰按照质量百分比为72.62%、15.98%、11.40%的比例混匀、加热、热压至350℃,从而热压成高铁铝土矿热压块,制成的热压块抗压强度为640N,碳氧摩尔比为1.2,碱度为1.5。

[0047] 将上述热压块装入到转底炉中进行金属化还原,还原区温度为1300℃,还原区的CO分压为79.3%,还原时间为20min,将还原产物从出料口排入到密闭容器中,还原产物的金属化率为93.7%。

[0048] 将冷却后的还原产物以及冶金石灰加入到电炉中进行熔化分离,熔分温度为1575℃,熔分时间为60min,终渣碱度控制为4.48,可实现铁与炉渣的分离,得到碳含量为4.4%的铁水以及铝酸钙炉渣,铁的回收率为95.47%。

[0049] 以10℃ / min的冷却速率将铝酸钙炉渣从1450℃冷却至1000℃,当温度低于1000℃时自然空冷,得到铝酸钙自粉渣,其中粒度小于0.074mm的部分占炉渣质量的93.4%。

[0050] 采用浓度为110g / L的Na 2 CO 3 Leaching Al from Calcium Aluminate Slag by Solution 2 o 3 ,浸出温度为90℃,浸出时间为90min,液固质量比为15:1,经过滤可得到浸出液和浸出渣;浸出液经结晶、干燥后可得到工业用Al 2 o 3 ,其浸出率为89.78%。

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Abstract

The invention provides a method for producing melted iron and aluminium oxide with high-iron bauxite and belongs to the metallurgical resource integrated technical field. The method mainly includes the steps that dehydrated and crushed high-iron bauxite powder, bituminous coal powder and metallurgical lime are mixed fully and evenly, heated and hot-pressed to form high-iron bauxite hot-pressed blocks; then metallization reduction is conducted in a rotary hearth furnace; reduction products and metallurgical lime are added to an electric furnace, fusion separation is conducted to obtain the melted iron and calcium aluminate furnace slag; the cooling rate of the calcium aluminate furnace slag is controlled, and after the calcium aluminate furnace slag is cooled to the room temperature, Al2O3 and leached furnace slag can be obtained through alkaline process leaching. According to the method, energy consumption is significantly decreased. The method has the advantages of simple technology, a short process, low cost and the like. The method has important practical significance for the development and utilization of high-iron gibbsite and broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and in particular relates to a method for producing molten iron and alumina from high-iron bauxite. Background technique [0002] With the development of my country's national economy, the domestic steel market demand is increasingly strong, and the demand for iron ore is also growing rapidly. However, my country's iron ore resources are rich in poor ore and rich in iron ore, which leads to the imbalance between supply and demand of resources, and has to import iron at high prices. ore. According to statistics, in 2014, my country's iron and steel enterprises had a sharp increase in the amount of imported iron ore, and their dependence was close to 70%, which is not optimistic for the sustainable development of the national economy. On the other hand, with the rapid development of the alumina industry, the demand for bauxite has increased sharply, but ...

Claims

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Application Information

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IPC IPC(8): C21B11/10C21B13/10C01F7/02
CPCY02P10/20
Inventor 储满生柳政根王峥王宏涛赵伟唐珏赵嘉琦付小佼冯聪汤雅婷李峰陈双印
Owner NORTHEASTERN UNIV
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