《翻译英文Word参考》由会员分享，可在线阅读，更多相关《翻译英文Word参考（18页珍藏版）》请在金锄头文库上搜索。
1、Effect of alumogoethite in Bayer digestion process ofhigh-iron gibbsitic bauxiteLI Xiao-bin 1, 2 , KONG Lian-lian 1, 2 , QI Tian-gui 1, 2 , ZHOU Qiu-sheng 1, 2 , PENG Zhi-hong 1, 2 , LIU Gui-hua 1, 2(1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
2、;2. National Engineering Laboratory for Efficient Utilization of Refractory Non-ferrous Metals Resources,Central South University, Changsha 410083, China)Abstract: The transformation law of goethite and its effect on the alumina recovery were investigated in order todetermine the reason of low alumi
3、na recovery in Bayer digestion process of gibbsitic bauxite with high alumogoethitecontent. The results show that the goethite present in this kind of bauxite has no obvious change in the digestiontemperature range of 110 to 240 with low alumina recovery. And alumogoethite can be transformed to hema
4、tite byincreasing digestion temperature to 260 or adding lime of 3% of dry ores added at about 240 , and the aluminadigestion rate increases with the increase of the goethite conversion degree. Adding non-calcareous additives in there-digestion process of red mud containing goethite can promote the
5、structure transformation of alumogoethite and thusalumina almost reacts completely. The transition of alumogoethite into other forms in Bayer digestion process isimportant for alumina recovery for lateritic bauxite.Key words: gibbsitic bauxite; high-iron; digestion; alumogoethite Goethite is common
6、in bauxite mainly containing one of the iron minerals in to gibbsite and goethite minerals are mainly lateritic bauxite, aluminum matter with like iron substitution in goethite formed aluminum goethite was a common phenomenon1.Is our country iron and aluminum smelting important potential resource 2o
7、f our country in Central Guangxi Guigang, Binyang and Heng and other has proven more than 5 million tons of high iron gibbsite type bauxite is the typical lateritic bauxite, it has the characteristics of high iron and high aluminum.In order to extract the iron and aluminum from the ore, a lot of res
8、earch is carried out both at home and abroad.Have studied by chemical method 3 and biological method 4, first accumulation bauxite in iron, smelting, also made the first high iron gibbsite type bauxite in blast furnace (EAF) smelting iron, then the slag leaching extraction of alumina and the first i
9、ron aluminum process,5And based on the characteristics of the bauxite in gibbsite under low temperature easy to dissolve in the water, the first ore by Bayer process stripping separation most aluminum, then from the dissolution of recovering iron from red mud first aluminum iron process 6-7 should b
10、e more reasonable. Therefore, it has been widespread concern, but the type bauxite in Bayer dissolution process in alumina dissolution rate (about 55%) is much lower than the theoretical rate of dissolution of (about 70%) 8, resulting in the process to apply in practice.Clearly such bauxite alumina
11、dissolution rate is low and so on Chen Shiyi 9-10 were studied, through XRD and FTIR spectra of goethite diffraction peak and vibration peak displacement to calculate the substitution rates of aluminum in goethite, that should be attributed to the part of the iron ore in goethite was replaced by an
12、aluminum, the so-called pin aluminum iron.However, because of many factors, the diffraction peaks and the vibration peaks can be shifted. Therefore, it is necessary to determine the existence and the effect of the aluminum needle iron.Because of the transformation of aluminum goethite is the premise
13、 of the dissolution of aluminum, Murray 11 have studied goethite hydrothermal conversion process, and suss and MALTZ 12 is of aluminum goethite in sodium aluminate solution leaching transformation behavior and silicon, titanium, calcium compounds the transition effects for hematite, but unfortunatel
14、y, were not on (aluminum) goethite transformation of leaching of ore in oxygen and aluminum ring.And MAL TS and MOZZHUKHINA 13 of Guinea high aluminum goethite content of bauxite for the dissolution test. The results showed that increase the dissolution temperature and addition of lime can improve t
15、he dissolution process of the technical indicators, but the addition of a large amount of lime will lead to increase the amount of red mud and the loss of aluminum.Therefore, further clarifying the aluminum goethite and its transformation impact on the process of the dissolution of alumina in the or
16、e, looking for other non calcium additive and promote the transformation of aluminum goethite for optimizing and strengthening such bauxite dissolution is very meaningful.Therefore, in this paper, the author tries to through the study of the dissolution process in aluminum needle conversion of iron ore and alumina dissolution correspondence between the rate and clarify the internal cause of Guangxi high iron gibbsite alumina to di
