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Method for preparing inorganic slag fibers by using thermal state coal slag

A technology of slag fiber and coal slag, which is applied in the direction of glass manufacturing equipment and manufacturing tools, can solve the problems of insufficient dual utilization of resources and waste heat energy, and achieve full utilization of waste energy, simple and easy preparation method, and improved The effect of utilization efficiency

Active Publication Date: 2011-12-14
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Coal slag, especially the waste heat utilization of hot coal slag has always been an important issue in the metallurgical and energy industries. At present, the dual utilization of resources and waste heat energy has not been well achieved.

Method used

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  • Method for preparing inorganic slag fibers by using thermal state coal slag
  • Method for preparing inorganic slag fibers by using thermal state coal slag
  • Method for preparing inorganic slag fibers by using thermal state coal slag

Examples

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preparation example Construction

[0038] The preparation method flow process of following embodiment is as description in accompanying drawing figure 1 shown. The hot coal slag used is: one or a mixture of waste slag discharged from coal combustion in thermal power plants, industrial and civil boilers, and other equipment. The main components include: SiO 2 40-50%, Al 2 o 3 20-35%, Fe 2 o 3 4-20%, CaO 1-5%, and a small amount of magnesium, sulfur, carbon, etc. The temperature of hot cinder is 900-1100°C.

[0039] The fly ash used includes: coal-fired power plants, boilers, etc., fly ash produced during coal combustion, solid residue, waste or their mixture. The element composition includes: O 40-47%, Si 10-30%, Al 6-24%, Fe 1-20% and Ca 0-25%.

Embodiment 1

[0041]70% by weight of hot coal slag and 30% of fly ash are solid-state mixed in a mixing device. After mechanical mixing, they are added to a melting resistance furnace with a temperature of 1600 ° C. After they are completely melted, the molten liquid It flows into the spinning machine, and under the action of the centrifugal force of the spinning roller, inorganic slag fibers are obtained, and at the same time, the fibers are cooled by blowing compressed air. The appearance of the fibers under the microscope is as follows: figure 2 shown. The average fiber diameter is 6.4μm, and the tensile strength of single filament is 65MPa.

Embodiment 2

[0043] Adopt the same preparation method as Example 1, the difference is that the percentage by weight of hot coal slag in the mixture is 50%, and the morphology of the inorganic slag fibers obtained at last is as follows: image 3 shown. The average fiber diameter is 5.6μm, and the tensile strength of single filament is 75MPa.

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Abstract

The invention provides a method for preparing inorganic slag fibers by using thermal state coal slag. According to the invention, thermal state coal slag and fly ash are produced through solid state well-mixing, and the mixture is heated to a melted state, such that melt water is obtained; the melt water is produced into filaments, such that the inorganic slag fibers are obtained. The invention is advantaged in that: the method is simple and easy to apply; the method is convenient to be put into practice; prepared inorganic slag fibers have relatively high flexibility and strength; simultaneous utilization of energy and material is realized; production cost is greatly reduced; energy consumption is low; no pollution is caused; circulation and high-efficiency utilization of resources are realized in a maximal degree. Therefore, the method provided by the invention has wide application prospect, positive social significance and positive environmental significance.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a method for preparing inorganic slag fibers, in particular to a method for preparing inorganic slag fibers by using hot coal slag. Background technique [0002] Coal slag is a kind of industrial solid waste, also known as slag, which is discharged from thermal power plants, industrial and civil boilers and other equipment burning coal. The main chemical composition of cinder is SiO 2 40-50%, Al 2 o 3 30-35%, Fe 2 o 3 4-20%, CaO 1-5%, and a small amount of magnesium, sulfur, carbon, etc. Its mineral composition mainly includes: anorthite, quartz, mullite, magnetite and pyrite, a large amount of silicon-containing glass (Al 2 o 3 2SiO2 2 ) and active SiO 2 , Active Al 2 o 3 And a small amount of unburned coal, etc. [0003] With the development of my country's industry, a large amount of coal slag is produced every ye...

Claims

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Application Information

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IPC IPC(8): C03B37/00
Inventor 王习东张作泰刘丽丽王景峰赵大伟
Owner PEKING UNIV
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