摘要:

The effect of heating temperature and time on the efficiency of pine oil was examined in the flotation of oxidized Amasra Coal in this work. Samples were taken from waste heap Amasra Coal which were collected in 1973–1978 and stored in atmospheric conditions. The optimized impeller speed was 1000 rpm, aeration rate was 35 ml/s and solid content of the pulp was 20% in the flotation tests. Motorin was added to the pulp as a collector. The pine oil was heated to 50°C, 75°C, 106°C, 125°C, 150°C, 175°C, 200°C and used as a frother. The flotation resulta indicated that 125°C was suitable temperature for heating. Increasing the heating time increased the efficiency of pine oil. The recovery of combustibles also Increased depending on the increase in the amount of oil heated for 5 hours at 125°C.

ISSN:0884-3759    

DOI:10.1080/08843759208916049

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The sulfur found in coal is generally divided into three forms: pyritic, sulfate, and organic sulfur. Originating fromirt-situoxidation of metal sulfides, sulfates axe present in coal at low concentrations. Being soluble in water, they are relatively easy to be leached from the coal. Similarly, microbial depyritization promotes the oxidative conversion of inorganic sulfur compounds to water-soluble products. The pyrite removal results from the combined effects of direct bacterial attack and indirect chemical solubilization. In the former, pyrite (FeS2) is oxidized by bacteria into Fe2(SO4)3; in the latter, ferric iron is the actual oxidizing agent and microorganisms serve to regenerate the ferric iron from ferrous iron.

ISSN:0884-3759    

DOI:10.1080/08843759208916050

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

A high ash (38%) Illinois coal was studied. Up to 37% by weight coal flotation recovery was observed at a pH of 5.Even small amounts of humic acids (70 ppm) were observed to completely depress the flotation recovery of the coal. The humic acids also decreased the zeta potential of the coal and a naturally occur ring pyrite. The addition of O-ethyl xanthic acid enhanced the flotability of coal as well as mineral matter, the increase in flotability of coal being greater than that of pyrite at low dosages of xanthic acid, the heating value recovery ratic was observed fee increase with the xanthic acid amount added, up to 79% Btu recovery was obtained. The humic acids adsorption on coal was also investigated.

ISSN:0884-3759    

DOI:10.1080/08843759208916051

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

As established by several previous works, nitrogen compounds play a prominent role in the evolution of middle distillates containing cracked components, particularly regarding sediment formation and color evolution.

ISSN:0884-3759    

DOI:10.1080/08843759208916052

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Liquefaction data in the presence and absence of added catalysts were obtained for two coals from the Argonne premium Sample Bank (Beulah-Zap lignite and Utah Blind Canyon high volatile bituminous). Experiments were carried out in tubing bomb microautoclave batch reactors over a broad temperature range (310 to 425°C), and THF and hexane conversion profiles were measured at residence times of 5, 10, 15, and 30 minutes in order to elucidate the effect of both time and temperature at reaction conditions ranging from low to high severity. All runs were carried out in a non-donor vehicle (l-methylnaphthalene) using powdered presulfided Shell 324 as the catalyst.

ISSN:0884-3759    

DOI:10.1080/08843759208916053

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Very large volumes of solid waste are generated during oil shale retorting. The reclamation and use of these wastes are desirable from an environmental and economical point of view. Two of the primary considerations in the disposal of these wastes are their structural integrity and the leaching of toxics into groundwater.

ISSN:0884-3759    

DOI:10.1080/08843759208916054

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0884-3759    

DOI:10.1080/08843759208916055

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor