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Reaction behaviour of Al_2O_3 and SiO_2 in high alumina coal fly ash during alkali hydrothermal process 被引量:19
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作者 蒋周青 杨静 +2 位作者 马鸿文 王乐 马玺 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第6期2065-2072,共8页
The reaction behaviours of A1203 and SiO2 in high alumina coal fly ash under various alkali hydrothermal conditions were studied. The means of XRD, XRF, FTIR and SEM were used to measure the mineral phase and morpholo... The reaction behaviours of A1203 and SiO2 in high alumina coal fly ash under various alkali hydrothermal conditions were studied. The means of XRD, XRF, FTIR and SEM were used to measure the mineral phase and morphology of the solid samples obtained by different alkali hydrothermal treatments as well as the leaching ratio of SiO2 to A1203 in alkali solution. The results showed that with the increase of the hydrothermal treating temperature from 75 to 160 ~C, phillipsite-Na, zeolite A, zeolite P, and hydroxysodalite were produced sequentially while the mullite and corundum phase still remained. Zeolite P was massively formed at low-alkali concentration and the hydroxysodalite was predominantly obtained at high-alkali concentration. By the dissolution of aluminosilicate glass and the formation of zeolites together, the leaching efficiency of SiO2 can reach 42.13% with the mass ratio of A1203/SIO2 up to 2.19:1. 展开更多
关键词 high alumina coal fly ash A1203 SIO2 alkali hydrothermal treatment reaction behaviour
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An Innovative Approach to Separate Iron Oxide Concentrate from High-sulfur and Low-grade Pyrite Cinders
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作者 Yong LI Fu-chun ZHOU +3 位作者 Zhao-xin ZHOU Zhi-han TIAN Chao YANG Xi-ke TIAN 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第8期756-764,共9页
High-sulfur and low-grade pyrite cinders are the waste products of sulfuric acid manufacturing plants.Many valuable components,such as iron oxide,are contained in pyrite cinders and difficult to be separated and purif... High-sulfur and low-grade pyrite cinders are the waste products of sulfuric acid manufacturing plants.Many valuable components,such as iron oxide,are contained in pyrite cinders and difficult to be separated and purified just via the high temperature roasting process.Considering this,an innovative method including water-washing,aqua regia leaching,hydrothermal alkali activation and acid-washing was developed.And the effects of different parameters on recovery efficiency of iron oxide were systematically investigated.The optimum parameters were proposed as follows:water rinse-leaching at room temperature for 5-20 min,and melting at 160 ℃ for 2.0h with NaOH(concentration of 30mass%),followed by leaching with aqua regia solution(3.0vol.%)for 1.0h.After the treatment,the content of iron oxides increased from 54.3to 96.0mass% with the recovery rate exceeding 85%.Meanwhile,calcium sulphate was recovered as the high value-added products by alkali extraction liquid.Furthermore,the phase transformation and microstructure of the samples in the process were studied by physicochemical methods to reveal the separation mechanisms of different components in the pyrite cinders. 展开更多
关键词 sulfur leaching contained alkali regia pyrite recovered hydrothermal systematically leached
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