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A kind of preparation method of fly ash raw meal pellet

A technology of raw meal pellets and fly ash, which is applied in the field of preparation of fly ash raw meal pellets, and can solve problems such as increasing sintering energy consumption

Active Publication Date: 2015-09-30
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a process scheme alleviates the problem of raw meal melting and sticking to the rotary kiln, but due to the addition of water in the pelletizing process, the sintering energy consumption is increased during the sintering process

Method used

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  • A kind of preparation method of fly ash raw meal pellet

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Embodiment Construction

[0039] The present invention is specifically described below in conjunction with accompanying drawing, as figure 1 As shown, the mixed raw material of fly ash and ammonium sulfate is sent to the raw material bin 2 by the conveyor one 1 for storage. The raw material in the raw material bin 2 enters the second conveyor 4, and is transported into the ball pressing machine 5 by the second conveyor 4. In the briquetting machine 5, the raw meal is pressed into raw meal pellets. The pellets pressed by the ball pressing machine 5 enter the belt conveyor 6, and are sent to the sieve 7 by the belt conveyor 6. The complete pellets on the sieve 7 are sent to the conveyor sintering kiln system by the conveyor 3 10, and the broken pellets screened out by the sieve 7 enter the broken ball bin 3 through the conveyor 4 8 and the conveyor 5 9 for storage. The crushed balls in the crushed ball bin 3 enter the second conveyor 4, and are mixed with the raw meal in the second conveyor 4, and fina...

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Abstract

The present invention discloses a fly ash raw material pellet production method, which comprises: 1) a mixing step, wherein coal powder coal and ammonium sulfate are mixed according to a predetermined ratio to obtain a raw material; 2) a pellet pressing step, wherein the raw material is pressed into a raw material pellet; 3) a screening step, wherein the complete pellet is conveyed into a sintering kiln system through screening, and the broken pellet is conveyed to the step 1); and 4) a re-pressing step, wherein the conveyed broken pellet and the raw material are mixed and are re-pressed into the pellet. According to the present invention, the raw material obtained by mixing the fly ash and the ammonium sulfate can be prepared into the raw material pellet, and the raw material pellet does not contain water and any other adhesives so as to effectively achieve energy saving and consumption reduction; and the physical performances of the raw material pellet produced by adopting the process can achieve the following parameters, wherein the single pellet density is 1.3-1.6 g / mm<3>, the pellet bulk density is 800-1000 kg / m<3>, the pellet initial strength is 400-650 N, and the pellet strength after heating is 1200-1500 N, such that the performances can completely meet production requirements of the sintering kiln.

Description

technical field [0001] The invention relates to a preparation technology of fly ash raw meal pellets, in particular to a preparation of raw meal pellets mixed with fly ash and ammonium sulfate applied in the "process of producing alumina by fly ash-ammonium sulfate sintering method" technology. Background technique [0002] There are many ways to produce alumina by using fly ash. Among them, the "fly ash-ammonium sulfate sintering method" is used to produce alumina by sintering fly ash and ammonium sulfate in a rotary kiln. [0003] In this production method, some process schemes mix fly ash and ammonium sulfate with dry powder to configure dry powdery raw materials into the rotary kiln for sintering. However, during the sintering process, the dry powder raw material melts and sticks to the wall of the rotary kiln, which affects heat transfer and is difficult to clean. [0004] Some process schemes adopt wet pelletizing process, that is, add water to fly ash and ammonium s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 王亮郑绪滨李银文
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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