一种粉煤灰的管道加停留罐脱硅方法

Pipeline and dwell tank desiliconization method of fly ash

Abstract

The invention relates to a pipeline and dwell tank desiliconization method of fly ash, which comprises the technical process that the fly ash is added into an NaOH solution to be prepared into fly ash material pulp; the materials are sent into a secondary multi-inner-pipe sleeve pipe preheater to be preheated to 70 to 75 DEG C; the preheated fly ash material pulp enters a multi-inner-pipe heater to be heated to 130 to 135 DEG C; then, material pulp enters a heat insulation dwell tank for dwelling 1 to 2 hours in the heat insulation dwelling tank; desiliconized material pulp enters a secondary flash evaporator; the material pulp gradually carries out temperature reduction and pressure reduction according to the grades; then, the material pulp enters a buffer groove; the material pulp is sent into a conventional fly ash separation and washing work procedure through a buffer pump; the material pulp in the buffer tank enters a water cooling type steam lack recovering device in a steam lack mode; and the heat is absorbed by low-temperature circulation water. The method of the invention has the characteristics of high heat utilization rate, low energy consumption, low investment, low operation cost, simple process flow, convenient production operation, convenient cleaning and maintenance and the like, can improve the aluminum-silicon ratio of the fly ash material pulp, and can remove 30 to 35 percent of silicon dioxide in the fly ash.
一种粉煤灰的管道加停留罐脱硅方法,工艺过程为:将粉煤灰加入到NaOH溶液中,调配成粉煤灰料浆,送入二级多内管套管预热器,预热到70~75℃;预热后的粉煤灰料浆进入多内管套管加热器,加热到130~135℃;然后料浆进入保温停留罐,在保温停留罐内停留1~2小时;脱硅后料浆进入二级闪蒸器,料浆逐级降温降压,然后料浆进入缓冲槽,通过缓冲泵将料浆送入常规的粉煤灰分离及洗涤工序,缓冲槽的料浆乏汽进入水冷式乏汽回收器,热量被低温循环水吸收。本发明方法具有热利用率高、能耗低、投资和运营成本低、流程简单、生产操作及清理检修方便等特点,能提高粉煤灰料浆铝硅比,能将粉煤灰中的二氧化硅脱除30~35%。

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Cited By (7)

    Publication numberPublication dateAssigneeTitle
    CN-102398912-AApril 04, 2012贵阳铝镁设计研究院有限公司高铝粉煤灰硫酸法溶出工艺
    CN-102398912-BOctober 15, 2014贵阳铝镁设计研究院有限公司高铝粉煤灰硫酸法溶出工艺
    CN-103274419-ASeptember 04, 2013天津大学Removal method of amorphous silicon dioxide in high-aluminum fly ash
    CN-103641142-AMarch 19, 2014东北大学设计研究院(有限公司)Desilicication method for whole pipeline heating reaction of fly ash
    CN-103641142-BOctober 28, 2015东北大学设计研究院(有限公司)一种粉煤灰的全管道化加热反应的脱硅方法
    CN-105692665-AJune 22, 2016东北大学设计研究院(有限公司)三水铝石型铝土矿的并联列管加停留罐溶出系统及方法
    CN-105692665-BNovember 28, 2017东北大学设计研究院(有限公司)三水铝石型铝土矿的并联列管加停留罐溶出系统及方法