Method for washing carbon for removing sodium from silicon-removed alkaline residues of coal ash or basic red mud after process of extracting Al2O3

A fly ash and desiliconization technology, which is applied in the field of alkaline red mud washing and desalination, and alkaline red mud washing and desalination process, can solve the problems of high operating temperature, rising process cost, poor economy, etc., and achieve water conservation , significant economic and social benefits, and the effect of reducing water consumption

Inactive Publication Date: 2011-01-12
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The quicklime dealkalization process has high operating temperature and generates calcium salt pollutants. With the increase of lime price,

Method used

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  • Method for washing carbon for removing sodium from silicon-removed alkaline residues of coal ash or basic red mud after process of extracting Al2O3
  • Method for washing carbon for removing sodium from silicon-removed alkaline residues of coal ash or basic red mud after process of extracting Al2O3

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] see figure 1 In this example, the silicon extracted from alkali-soluble fly ash is prepared into white carbon black and the residue is desodiumized, including static washing and stirring washing, and the flue gas after desulfurization is added to the stirring washing liquid three times. The ventilation rate is 1.5L / min, the liquid-solid ratio L / S=8, the washing temperature is controlled at 40°C, and the stirring washing time is 1h.

[0039] Follow the steps below to remove sodium:

[0040] (1) Stand and wash with 1.2 normal temperature industrial demineralized water on the belt filter machine based on the dry basis of fly ash extraction of silicon and alkali slag to elute the attached alkali.

[0041] (2) The alkaline red mud after static washing is sent to the stirring and washing reactor at a liquid-solid ratio of L / S=8 for stirring and washing. During the stirring and washing, the flue gas after desulfurization is intermittently introduced into the flue gas after de...

Embodiment 2

[0049] see figure 1 , the present embodiment extracts Al from fly ash 2 o 3 After the process, the alkaline red mud is desodiumized, including static washing and stirring washing, adding desulfurized flue gas to the stirring washing liquid three times, controlling the stirring washing temperature to 60°C, and the liquid-solid ratio L / S=3, The ventilation rate of the flue gas after desulfurization is 1L / min, and the stirring and washing time is 2h.

[0050] Follow the steps below to remove sodium:

[0051] (1) Stand and wash with 1 room temperature industrial demineralized water based on fly ash alkaline red mud dry base on the belt filter to elute the attached alkali.

[0052] (2) The alkaline red mud after static washing is sent to the stirring washing reactor at the liquid-solid ratio L / S=5 for stirring and washing. During the stirring and washing, the flue gas after desulfurization is intermittently introduced into the flue gas after desulfurization. The flue gas is eve...

Embodiment 3

[0060] see figure 1 , the present embodiment extracts Al from fly ash 2 o 3 After the process, the alkaline red mud is desodiumized, including static washing and stirring washing, and the flue gas after desulfurization is added to the stirring washing liquid three times, the ventilation rate is 0.5L / min, and the liquid-solid ratio L / S=3 , the washing temperature is 50°C, and the stirring and washing time is 3h.

[0061] Follow the steps below to remove sodium:

[0062] (1) Stand and wash with 1.5 normal temperature industrial demineralized water based on the dry base of fly ash alkaline red mud on the belt filter to elute the attached alkali.

[0063] (2) The alkaline red mud after static washing is sent to the stirring and washing reactor at a liquid-solid ratio of L / S=3 for stirring and washing. During the stirring and washing, the desulfurized flue gas is intermittently introduced into the flue gas three times. The flue gas is evenly dispersed in a three-phase reactor a...

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Abstract

The invention discloses a method for washing carbon for removing sodium from silicon-removed alkaline residues of coal ash or basic red mud after a process of extracting Al2O3. The method is characterized by comprising the following step of: in a stirring and washing process, introducing desulfurated flue gas into a stirring and washing solution, wherein the washing temperature of the stirring and washing solution after introducing the desulfurated flue gas is 30-80 DEG C, the liquid/solid ratio L/S of the stirring and washing solution is 3-10, the introducing quantity of the flue gas is 0.5-2L/min, and the stirring and washing time is 1-3h. The method is simple and easy to apply, and the used stirring and washing solution can be used as a carbon source for cultivating spirulinas and a pH regulating agent; the silicon-removed alkaline residues after sodium removal can be used as a substrate for producing aluminum oxide by a lime sintering method; and the red mud after sodium removal is used as a substrate for producing silicate cement. The invention not only achieves the effects of waste gas emission reduction, waste liquid recycling and waste reduction, but also truly realizes a circulating economic model of the sustainable comprehensive recycling of three wastes (waste flue gas, sodium removal liquid and the red mud), and has obvious economic and social benefits.

Description

technical field [0001] The present invention is a method for removing sodium in alkaline residue by carbon washing, and relates to desilicate alkali residue after producing white carbon black with fly ash and using the alkali residue to produce alkali after alumina process by soda lime or lime sintering method Washing and desodiumizing process of alkaline red mud, and washing and desodiumizing of alkaline red mud after bauxite production of alumina process. It is used for the desilication and alkali slag of fly ash for the production of alumina or the washing and desodiumization process of red mud for the production of Portland cement base material. Background technique [0002] Fly ash is a solid waste from coal-fired power plants. At present, the total stockpile of fly ash in my country has exceeded 1 billion tons, and it is still increasing at a rate of 10 million tons per year. The discharge of a large amount of fly ash not only occupies a large amount of land, but als...

Claims

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Application Information

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IPC IPC(8): C02F11/00C04B7/38
Inventor 白光辉李鹏程徐鹏王同松
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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