Method for extracting alumin from aluminous fly-ash and method for producing cement from fag end

A high-alumina fly ash and alumina technology, applied in the field of cement production, can solve the problems of high energy consumption, difficulty in realization, and low utilization rate of fly ash, achieve energy-saving calcination equipment, reduce production costs, and simplify calcination equipment Effect

Inactive Publication Date: 2007-09-05
CHANGAN UNIV
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Problems solved by technology

This technology is a new technology proposed by our country's scientific and technological personnel. It has not been proved that it can be successfully industrialized for more than 20 years. In addition to other reasons, the technology itself has serious problems: first, it is the steaming of calcium oxide and fly ash under normal pressure. To produce hydrated calcium aluminate and hydrated calcium silicate, this is not easy to achiev

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  • Method for extracting alumin from aluminous fly-ash and method for producing cement from fag end

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Embodiment 1

[0034] raw material

[0035] Process ratio: fly ash / lime=1 / 2, adding water to solid-liquid ratio: 1:0.3, steaming at 180°C for 4 hours, calcining at 900°C for 4 hours, 8% sodium carbonate solution in accordance with the liquid-solid ratio of 5:1 After leaching at 80°C for 40 minutes, the leaching rate of alumina is 80%, and the content of silicon oxide in alumina is less than 0.3%, meeting the composition requirements of metallurgical grade alumina.

[0036] name

[0037] name

[0038] The results obtained from the above ingredients KH=0.89, SM=2.29, IM=1.31 all meet the requirements of wet kiln calcined cement. The 28-day compressive strength of the cement obtained according to the above ratio is greater than 52.5MPa, and the flexural resistance is greater than 7MPa, reaching the strength grade of No. 52.5 cement.

[0039] raw material

[0040] name

[0041] name

[0042] Among the above ingredients, KH=89, SM=1.94, ...

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Abstract

A process for extracting aluminum oxide from high-Al powdered coal ash and using the residual dregs to prepare cement includes such steps as mixing with lime and water, steam pressure reaction to generate the resultant containing hydrated calcium silicoaluminate and calcium hydroxide, calcining, extracting in sodium carbonate solution to obtain aluminum oxide, desiliconizing, carbonizing, calcining to obtain high-purity aluminum oxide, and using the SiCa dregs to prepare cement.

Description

technical field [0001] The invention relates to a method for extracting alumina, in particular to a method for extracting alumina from high-alumina fly ash, and also relates to a method for producing cement from the waste residue of extracting alumina from high-alumina fly ash. Background technique [0002] There are already many patents at home and abroad for the extraction of alumina from fly ash and the simultaneous production of cement. [0003] The methods of extracting alumina from fly ash at home and abroad can be divided into two categories: alkaline method and acid method. Due to the fatal shortcomings of the acid method in the industry, such as corrosive equipment and difficult recovery of acid, despite the continuous emergence of patents, the promotion of industrialization has been greatly restricted. [0004] In the 1960s, Polish scientist J. Grzymek invented the principle of lime self-pulverization method and built an experimental plant with an annual output of...

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Application Information

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IPC IPC(8): C01F7/30C04B7/24
CPCY02P40/10
Inventor 赵鹏李昊明魏林
Owner CHANGAN UNIV
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