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A method for flue gas carbon fixation seawater decalcification

A flue gas and seawater technology, applied in seawater treatment, separation methods, water softening, etc., can solve the problem of high cost of decalcification, and achieve the effect of strong operability, reduced treatment cost, and favorable industrialization implementation.

Active Publication Date: 2015-10-28
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this patent, it is proposed to use sodium hydroxide aqueous solution as the alkali source, which makes the cost of decalcification relatively high. Therefore, the search for an alkali source with low price, wide range of sources, and easy availability directly determines the new technology of flue gas seawater decalcification cost and industrial feasibility

Method used

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  • A method for flue gas carbon fixation seawater decalcification
  • A method for flue gas carbon fixation seawater decalcification
  • A method for flue gas carbon fixation seawater decalcification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Set the calcium content to 0.87kg / m 3 The brine is introduced into the pre-mixing tank by the pump, and the alkali source is added to the brine. The type of alkali source is white mud produced after decalcification and magnesium pretreatment in the brine refining process of the soda plant, and the content of magnesium hydroxide in the white mud is 10. %, the mass content of calcium carbonate is 50%, the mass content of calcium sulfate is 20%, and the mass content of calcium chloride is 10%. And the molar ratio of the total magnesium content in the added alkali source to the calcium content in the total brine is 3:1, stir for 20 minutes to fully mix the brine and the alkali source. Use the pump to make the brine mixed with the alkali source 10m 3 The flow rate of / h enters the decalcification tank, and at the same time, the flue gas is introduced into the decalcification tank through the aeration head through the Roots blower, wherein the carbon dioxide content of the c...

Embodiment 2

[0031] Set the calcium content to 1.20kg / m 3 The brine is introduced into the pre-mixing tank by the pump, and the alkali source is added to the brine. The type of alkali source is white mud produced after decalcification and magnesium pretreatment in the brine refining process of the soda plant. The content of magnesium hydroxide in the white mud is 15 %, the mass content of calcium carbonate is 40%, the mass content of calcium sulfate is 15%, and the mass content of calcium chloride is 14%. And the molar ratio of the total magnesium content in the added alkali source to the calcium content in the total brine is 4:1, stir for 30 minutes, so that the brine and the alkali source are fully mixed. Use the pump to make the brine mixed with alkali source 20m 3 / h flow into the decalcification tank, at the same time, the flue gas is introduced into the decalcification tank through the aeration head through the Roots blower, wherein the carbon dioxide volume content of carbon dioxid...

Embodiment 3

[0033] Set the calcium content to 0.89kg / m 3 The concentrated seawater is introduced into the pre-mixing tank by the pump, and the alkali source is added to the brine. The type of alkali source is white mud produced after decalcification and magnesium pretreatment in the brine refining process of the soda plant, and the content of magnesium hydroxide in the white mud is 12%, the mass content of calcium carbonate is 55%, the mass content of calcium sulfate is 3%, and the mass content of calcium chloride is 12%. And the molar ratio of the total magnesium content in the added alkali source to the calcium content in the total brine is 2.5:1, and stirred for 30 minutes to fully mix the brine and the alkali source. Use the pump to make the brine mixed with alkali source 15m 3 / h flow into the decalcification tank, at the same time, the flue gas is introduced into the decalcification tank through the aeration head through the Roots blower, wherein the carbon dioxide volume content o...

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Abstract

The invention relates to a new method for removing calcium from seawater through flue gas carbon sequestration. The method comprises the following steps: 1, inducing seawater from a pump or a high level water tank into a premixing barrel, adding an alkali source into the seawater, and stirring for 10-30min for fully mixing the seawater with the alkali source; 2, allowing the alkali source-containing seawater to enter a calcium removal pool through a pump, and introducing flue gas into the calcium removal pool through an aeration head in order to make the flue gas contact with the seawater; and 3, allowing mass-transferred seawater to directly enter a settlement pool from the calcium removal pool, settling, filtering, and outputting the obtained clarified liquid at the upper portion of the settlement pool through a pipeline to obtain low calcium seawater. Alkali factory waste white mud is used to substitute sodium hydroxide as an alkali source, so the subsequent processing problem of the alkali factory white mud is solved, a continuous reaction is realized, industrial enforcement is benefited, and the calcium removal pretreatment cost of 1t of raw seawater is reduced by 1-2yuan.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of seawater desalination and comprehensive utilization. Specifically, it is a process method that uses an economical alkali source to realize the coupling of continuous flue gas carbon fixation and seawater decalcification. Background technique [0002] With rapid economic development, population increase, and huge resource consumption, the water resources in seawater account for about 96.5% of the global water reserves. The development of seawater desalination has become a strategic way to solve the water resource crisis. Moreover, the total amount of chemical mineral resources dissolved in seawater is huge. Among them, the total reserves of potassium, lithium and uranium respectively reach 550×10 12 t, 2400×10 8 t, 45×10 8 t is thousands to tens of thousands of times the world's total terrestrial resources; almost all global bromine resources are stored in seawater. Brine is more miner...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/02B01D53/78B01D53/62C02F103/08
Inventor 袁俊生赵颖颖纪志永李栋婵王军李洪
Owner HEBEI UNIV OF TECH
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