Extraction of alumina by limestone sintering
Extraction of alumina from low-grade kaolin in the
2022年11月1日 Extraction of alumina from low-grade kaolin in the presence of lime and NaOH via multi-stage hydrothermal process. Author links open the aluminum and
Extraction of alumina from kaolin by a combination of
2019年5月1日 The favorable operating conditions for the sintering of kaolin and limestone to produce efficient self-powdering are, firing the materials at 1350 °C for 1 h. The
(PDF) Factors affecting on the extraction of alumina from
2019年11月12日 extraction of alumina from ka olin-limestone. The effect of the sintering temperatures on t he ex- traction of a lumina was investigated in the range from 800 to
Studying the Efficiency of Lime-Soda Sinter
2018年5月25日 The three processes commonly used for extraction of alumina from clays are; (1) the acid leaching with sulfuric acid, hydrochloric acid or nitric acid to extract the alumina from calcined clay 18
Alumina from coal wastes by the lime-soda sinter process
The lime-soda sinter process for alumina extraction from domestic coal wastes was investigated. The recovery of alumina up to 80% was obtained by sintering coal waste
Development of Alumina Production Technology by
Sintering mode: heating rate was 8-10 ° per minute; sintering temperatures 1150 ° C, 1200 ° C, 1250 ° C. After aging, the sinters were cooled together with the furnace to 600 ° in 1
Formation of calcium aluminates in the lime sinter process.
@article{osti_, title = {Formation of calcium aluminates in the lime sinter process. [Extraction of alumina from fly ash]}, author = {Chou, K. S.}, abstractNote = {A study of
EXTRACTION OF ALUMINA FROM IRAQI COLORED
EXTRACTION OF ALUMINA FROM IRAQI COLORED KAOLIN BY LIME-SINTER PROCESS . Abdul Wahab A. Al-Ajeel of sintering temperature and time, concentration
Extraction of alumina from Iraqi colored kaolin by lime
2014年12月31日 The claystone was intimately mixed with limestone and the mixture was sintered. and an alumina extract (sodium aluminate solution) was obtained. By
Enhanced alumina extraction from kaolin by
The lime-sintering process is the most cost-effective, time-efficient and energy-efficient method for alumina extraction from kaolin at 1360°C when compared with the other pyro-hydrometallurgical methods (i.e. the Bayer and the soda-lime-sintering methods; ElDeeb et al., Reference ElDeeb, Brichkin, Kurtenkov and Bormotov 2019, Reference ElDeeb
Development of Alumina Production Technology by
2020年1月1日 The optimal conditions of experiments on sintering samples of ash-and-slag materials were determined.Two-stage desiliconization and carbonization of sinter leaching solutions, and calcination of aluminum hydroxide experiments were carried out.Alumina, corresponding in composition to metallurgical alumina (alumina content of 97,77%) was
Extraction of alumina from alumina rich coal gangue by a
2020年4月29日 Extraction of alumina experiments were performed in the autoclave. For each experiment, 20 g of ARCG, 14.5 g of Ca(OH) 2 and a certain proportion of sodium aluminate solution with a caustic ratio (molar ratio of Na 2 O to Al 2 O 3) of 25 were mixed. Then, the alumina extraction reaction can take place under certain temperatures and
Separation of alumina and silica from metakaolinite by
2022年3月28日 Alumina in the sintering product can be recovered by leaching with Na2CO3 solution, and 2CaOSiO2 and CaCO3 are the main minerals in red mud. This method is known as the lime-sintering process, the reactions for which are presented in Eqs. (3) and (4). Another typical sintering process is the lime−soda sintering process. After
AA31 Extracting Alumina From Coal Fly Ash With
2020年12月20日 solution to extract alumina from fly ash. Most alumina and ferric oxide of the CFA was leached into the solution. All of silica was retained in solid phase. produced using the limestone sintering process [5−8], soda-lime sintering process [9,10], leaching by acid with ammonium fluoride process [11,12]. A number of problems in these
Recovery of alumina from circulating fluidized bed
2014年5月6日 studies on the extraction of alumina from fly ash have been performed using acid or base as the leaching agent [8−11]. In the 1950s, scientists from Poland explored a fly ash treatment using a limestone sintering process to recover the alumina [12]. In this scheme, fly ash was mixed with limestone and heated to 1300 °C, converting
Production of sintered glass-ceramic composites from
2 之 This study proposed to produce low-cost sintered glass-ceramic composite by adding a mixture of molten mining tailings, recycled glasses and alumina platelets at different rates. The results showed that glass-ceramic composite made by 50 wt % molten tailings, 25 wt % recycled borosilicate glass and 25 wt % alumina platelets exhibited the
The activating effect of carbon during sintering the
Extraction of alumina into the solution was evaluated by the Al 2 O 3 content in sinter and sludge. The results of experimental studies showed that the largest increase in the extraction of alumina from kaolin ore is more than 7% with a carbon content in the charge from 1.5 to 3.0%, depending on the nature of the carbon material.
Industrial Chemistry: Open Access
bauxite, alumina and other aluminum products extract from other sources rather than bauxite become a new trend [9]. The Soviet Union because of political reasons were purchased bauxite embargo in seventies of last century, under this condition development use fly ash and coal waste as raw material to limestone sintering produce alumina
Ore Assimilation and Secondary Phases by Sintering of
2019年2月22日 During the iron ore sintering process, two types of particles are present in the sinter bed: (1) fines, which are actively taking part in melting and the formation of secondary phases, and (2) coarse ores, which are partially interacting with the surrounding melt. The quality of the final sinter is particularly determined by the secondary phases
Enhanced alumina extraction from kaolin by
The lime-sintering process is the most cost-effective, time-efficient and energy-efficient method for alumina extraction from kaolin at 1360°C when compared with the other pyro-hydrometallurgical methods (i.e. the Bayer and the soda-lime-sintering methods; ElDeeb et al., Reference ElDeeb, Brichkin, Kurtenkov and Bormotov 2019, Reference ElDeeb
Study on Extraction of Alumina from Sericite Phyllite
2013年3月1日 Alumina from sericite phyllite was extracted by the way of limestone self-pulverization sintering technique. The key technical processes, including self-pulverization sintering, clinker leaching reaction and the carbonation decomposition, were investigated systematically. The results showed that the main phases of pulverized clinker consisted
Development of Alumina Production Technology by
2020年1月1日 The optimal conditions of experiments on sintering samples of ash-and-slag materials were determined.Two-stage desiliconization and carbonization of sinter leaching solutions, and calcination of aluminum hydroxide experiments were carried out.Alumina, corresponding in composition to metallurgical alumina (alumina content of 97,77%) was
Chapter 2. Production and Processing of Aluminum
1999年5月7日 clear trend toward the production of increased quantities of sandy alumina. In Russia, due to a lack of bauxite, a process using nepheline as feed-stock has been used to produce alumina. Essentially the technique consists of sintering a nepheline ore, or concentrate, with limestone. The resultant sinter-cake consists of sodium and potassium
Separation of alumina and silica from metakaolinite by
2022年3月28日 Alumina in the sintering product can be recovered by leaching with Na2CO3 solution, and 2CaOSiO2 and CaCO3 are the main minerals in red mud. This method is known as the lime-sintering process, the reactions for which are presented in Eqs. (3) and (4). Another typical sintering process is the lime−soda sintering process. After
Lime-sinter process for production of alumina from fly ash
Approximately 5.0 wt % refuse increases alumina recovery from 55% to 90% for subbituminous coal ashes and reduces the required sintering temperature from 1380 to 1200/sup 0/C. Mixtures of fly ash and various amounts of coal cleaning refuse and limestone are sintered at different temperatures and lengths of time to determine the optimum
RESEARCH ARTICLE
2019年11月28日 extraction of alumina and silica become a research hotspot, and gradually expand the industrial experiment, get the different chemical products, the main methods used by the Pre-desilication soda lime sintering process, sintering method of limestone, digestion acid, acid and alkali combination method etc..
EXTRACTION OF ALUMINA FROM IRAQI COLORED
EXTRACTION OF ALUMINA FROM IRAQI COLORED KAOLIN BY LIME-SINTER PROCESS . Abdul Wahab A. Al-Ajeel of sintering temperature and time, concentration of sodium carbonate solution, leaching time Limestone 0.84 0.15 0.06 0.006 54.6 0.14 n.a. n.a. 42.28 Other materials used include, soda ash (sodium carbonate) and CO
Production of sintered glass-ceramic composites from
2 之 This study proposed to produce low-cost sintered glass-ceramic composite by adding a mixture of molten mining tailings, recycled glasses and alumina platelets at different rates. The results showed that glass-ceramic composite made by 50 wt % molten tailings, 25 wt % recycled borosilicate glass and 25 wt % alumina platelets exhibited the
Ore Assimilation and Secondary Phases by Sintering of
2019年2月22日 During the iron ore sintering process, two types of particles are present in the sinter bed: (1) fines, which are actively taking part in melting and the formation of secondary phases, and (2) coarse ores, which are partially interacting with the surrounding melt. The quality of the final sinter is particularly determined by the secondary phases