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Fushun oil shale residue of preparation of alumina and silica

Author: ShiJiaWei
Tutor: ZhangQiuMin
School: Dalian University of Technology
Course: Energy and chemical
Keywords: Oil shale residue Alumina Silica
CLC: TE992.3
Type: Master's thesis
Year: 2011
Downloads: 136
Quote: 0
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Abstract


The residue is oil shale oil shale-oil industrial combustion and power generation and other chemical wastes generated in the process, not only on the environment if discarded directly cause unnecessary pollution and destruction, but also a waste of resources. This paper aims to exploit oil shale residue preparation of alumina and silica, to explore a suitable oil shale residue recycling experiments. Experiments of Fushun oil shale-oil residue as raw material, first with acid extraction of raw materials in the Al2O3, and then through the alkali-soluble reaction residue of SiO2 into Na2SiO3. The effects of raw material particle size, calcination temperature and calcination time, acid concentration, liquid to solid ratio, reaction temperature and reaction time on oil shale residue leaching rate of Al2O3 and SiO2 were investigated. The results showed that the best Fushun oil shale residue calcination temperature was 850 ℃, calcination time was 1.0h, raw material particle size of 0.074mm; optimal concentration of hydrochloric acid reaction is 12%, liquid to solid ratio of 5:1, the reaction temperature is 100 ℃, reaction time 1.5h; alkali-soluble reaction optimum concentration of NaOH was 6mol / L, liquid to solid ratio of 5:1, the reaction temperature is 90 ℃, reaction time 3.0h. In the resulting optimum conditions, Al2O3 and SiO2 raw material leaching rates were 81.75% and 80.01%. Homogeneous precipitation method using chemical reaction of the acid-soluble aluminum chloride filtrate alumina prepared by single factor method to determine the optimum conditions were as follows: reaction temperature is 55 ℃, sodium aluminate concentration of 0.4mol / L, ethyl acetate ester joined with aluminum ions 1.7:1 molar ratio of the reaction time was 1.5h, the dose of the active mass of the total system of 0.3%. The process indicators in optimum conditions, the resulting median diameter (d50) of 0.216μm alumina white powder. The characterization study confirmed that the product obtained is γ-Al2O3. After separation and purification by acetic acid purity was 98.7%. Using carbon dioxide instead of latent acidifier acid, acetic acid with high selectivity separation method of the oil-shale-oil residue residue after extraction of alumina as the raw material, low corrosion preparation of high-quality low-power conditions The process of silica and to study the process conditions the particle size distribution of white carbon black products were investigated. Studies show that the carbonation reaction by alkaline extract residue silica sodium silicate solution preparation optimum conditions as follows: reaction temperature is 50 ℃, the concentration of sodium silicate solution 0.0274g/ml, CO2 flow rate of 20ml / min, the surfactant in an amount of polyethylene glycol 6000 0.007g/ml, obtained under this condition, the smallest particle size of silica, of 20-30nm, after separation and purification by acetic acid purity of 98.4% silica.

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CLC: > Industrial Technology > Oil and gas industry > Oil machinery and equipment and automation > Environmental protection and comprehensive utilization of oil and natural gas industry
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