Method for preparing calcium chloride from fluidized bed fly ash

A fly ash and fluidized bed technology, applied in the chemical field, can solve the problems of high raw material cost and low product benefit, and achieve the effects of low corrosiveness, easy operation and mild reaction conditions

Active Publication Date: 2020-03-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But above-mentioned process raw material cost is big, and product benefit is low

Method used

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  • Method for preparing calcium chloride from fluidized bed fly ash
  • Method for preparing calcium chloride from fluidized bed fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A kind of method utilizing fluidized bed fly ash to prepare calcium chloride, flow chart sees figure 1 , including the following steps:

[0053] Dilute acid decalcification: use fly ash and water to mix according to the liquid-solid ratio of 4:1, and add hydrochloric acid with a concentration of 350g / L to it, adjust the pH to 3.5, the reaction temperature is 60°C, the reaction time is 90min, and the rotation speed is 350r / min; after the reaction is over, the filtrate is obtained after solid-liquid separation and washing, and the leached residue is washed at a temperature of 80°C with a liquid-solid ratio of 1.5:1;

[0054] Circulation process: mix the above-mentioned filtrate and fly ash raw materials according to the above-mentioned ratio, and carry out cyclic enrichment according to the conditions of the dilute acid decalcification process. After 6 cycles, filter to obtain a calcium-enriched solution;

[0055] System regulation: add calcium oxide to the calcium-enric...

Embodiment 2

[0058] A kind of method utilizing fluidized bed fly ash to prepare calcium chloride comprises the steps:

[0059] Dilute acid decalcification: use fly ash and water to mix according to the liquid-solid ratio of 3:1, and add hydrochloric acid with a concentration of 300g / L to it, adjust the pH to 3, the reaction temperature is 55°C, the reaction time is 60min, and the rotation speed is 350r / min; after the reaction is over, the filtrate is obtained after solid-liquid separation and washing, and the leached residue is washed with water at a temperature of 25°C at a liquid-solid ratio of 0.5:1 for later use;

[0060] Circulation process: mix the above-mentioned filtrate with the fly ash raw material according to the above-mentioned ratio, and carry out cyclic enrichment according to the conditions of the dilute acid decalcification process, and after 5 cycles, filter to obtain a calcium-enriched solution;

[0061] System regulation: add calcium oxide to the calcium-enriched filtra...

Embodiment 3

[0064] A kind of method utilizing fluidized bed fly ash to prepare calcium chloride comprises the steps:

[0065] Dilute acid decalcification: use fly ash and water to mix according to the liquid-solid ratio of 5:1, and add hydrochloric acid with a concentration of 250g / L to it, adjust the pH to 4, the reaction temperature is 75°C, the reaction time is 120min, and the rotation speed is 350r / min; After the reaction is over, the filtrate is obtained after solid-liquid separation and washing, and the leached residue is washed at a temperature of 100°C by adding water at a liquid-solid ratio of 2:1 for later use;

[0066] Circulation process: mix the above-mentioned filtrate and fly ash raw materials according to the above-mentioned ratio, and carry out cyclic enrichment according to the conditions of the dilute acid decalcification process. After 6 cycles, filter to obtain a calcium-enriched solution;

[0067] System regulation: add calcium oxide to the calcium-enriched filtrate ...

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Abstract

The invention provides a method for preparing calcium chloride from fluidized bed fly ash. According to the method, the pH value is strictly controlled and adjusted by using hydrochloric acid, the material-liquid ratio and the reaction conditions are optimized, calcium ions are creatively enriched through a cyclic leaching method, and all the conditions in all the steps are in synergistic interaction, so that the condition is mild, the calcium element extraction efficiency is high, the filtrate has high calcium ion content and low impurity ion content, the solid phase has low calcium content,a high-quality raw material is provided for the preparation of calcium chloride drying agents and composite materials, secondary pollution is avoided, and the method has wide application prospects andhuge market value.

Description

technical field [0001] The invention belongs to the field of chemistry and relates to a method for preparing calcium chloride from fly ash in a fluidized bed. Background technique [0002] Coal is the most important source of energy in my country. At present, more than 60% of coal is burned and transformed through pulverized coal furnaces or fluidized beds and used in the fields of thermal power generation and high-temperature steam production. However, due to the high sulfur content, the exhaust gas is mainly purified by spraying calcium desulfurization in the furnace at present, and the sulfur component enters the fly ash in the form of calcium sulfate to form high-calcium fly ash. Due to the resource characteristics of high calcium content of fly ash, no effective way of resource utilization has been formed at present, and it is still mainly stockpiled, which has caused serious problems such as air, soil and water pollution. [0003] Based on the above problems, the reso...

Claims

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Application Information

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IPC IPC(8): C01F11/24
CPCC01F11/24C01P2006/80
Inventor 张建波杨晨年李会泉李少鹏胡文豪
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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