Method for manufacturing high-purity vaterite-type and calcite-type calcium carbonate by using indirect carbonation of seawater

A calcite-type, carbonation technology, applied in calcium carbonate/strontium/barium, chemical instruments and methods, separation methods, etc., can solve the problems of reducing the economical efficiency of indirect carbonation technology and increasing process costs

Active Publication Date: 2020-09-29
KOREA MARITIME UNIV IND ACADEMIC COOPERATION FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] High solvent costs and the use of additives or additional energy present problems that increase the overall process cost and reduce the economics of indirect carbonation technology

Method used

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  • Method for manufacturing high-purity vaterite-type and calcite-type calcium carbonate by using indirect carbonation of seawater
  • Method for manufacturing high-purity vaterite-type and calcite-type calcium carbonate by using indirect carbonation of seawater
  • Method for manufacturing high-purity vaterite-type and calcite-type calcium carbonate by using indirect carbonation of seawater

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0076] Preparation Example 1: Raw material for ensuring indirect carbonation reaction (Ca Source)

[0077] In this example, the by-products of alkali industry, calcium oxide (CaO) and calcium hydroxide (Ca(OH) 2 ) reagents as raw materials for indirect carbonation reactions. Cement kiln dust (CKD) and paper sludge ash (PSA) were used as by-products of the alkali industry. Each industrial by-product is sieved through a 425μm sieve and used. For calcium oxide, a Hayashi Pure Chemical Ind. reagent (assaymin. 98%) was used, and for calcium hydroxide, a Junsei Chemical reagent (assaymin. 96%) was used.

[0078] The effective particle size of CKD used in this example is 23.6, and the chemical composition analysis results using XRF (X-ray fluorescence spectrometer: X-ray fluorescence spectrometer) equipment are shown in Table 2 below.

[0079] [Table 2]

[0080]

preparation example 2

[0081] Preparation example 2: Ensuring seawater and seawater desalination concentrated water

[0082] Solvents for indirect carbonation reactions use seawater and desalinated concentrated water. The seawater is used for taking water from the coast, and the desalination concentrated water is used for taking water from the seawater desalination plant. Seawater and concentrated water were immediately filtered with 5 μm filter paper (FilterPaper 2, ADVANTEC) and stored in cold storage.

[0083] The pH of the seawater used in this example is 7.97, and the calcium and magnesium concentrations measured by an atomic absorption spectrophotometer are 474㎎ / L and 1,322㎎ / L, respectively, which are similar to ordinary seawater.

[0084] In addition, the pH of the desalinated concentrated water used in this example was 7.82, and the calcium and magnesium concentrations were 900 ㎎ / L and 3,900 ㎎ / L, respectively.

Embodiment 1

[0085] Embodiment 1: Utilize seawater to prepare calcium dissolution solution

[0086] Seawater or desalinated concentrated water is used as a solvent for the indirect carbonation reaction, and cement kiln dust (CKD) or paper sludge incineration ash (PSA) as an industrial by-product is used as a raw material for the indirect carbonation reaction. In addition, calcium oxide ( CaO) and calcium hydroxide (Ca(OH) 2 ) As the raw material of the indirect carbonation reaction, a calcium eluate was prepared.

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Abstract

The present invention relates to a method for manufacturing high-purity vaterite-type or calcite-type calcium carbonate by using indirect carbonation of seawater, wherein: calcium of alkaline industrial byproducts (CKD and PSA), CaO, and Ca(OH)2 is eluted using seawater as a solvent, so that calcium can be eluted with high efficiency using magnesium contained in seawater; the purity of calcium carbonate can be increased by using the alkaline industrial byproducts to precipitate magnesium in seawater, which disturbs the production of high-purity calcium carbonate; and vaterite-type and calcite-type calcium carbonate having high purity of 99.9% or higher can be economically manufactured by utilizing seawater instead of a high-cost solvent.

Description

technical field [0001] The invention relates to a method for preparing high-purity vaterite-type and calcite-type calcium carbonate by using seawater indirect carbonation reaction. Background technique [0002] Excessive greenhouse gas emissions caused by industrial development, exceeding the allowable range of nature, are considered to be the main cause of global warming. Types of greenhouse gases are carbon dioxide (CO 2 ), methane (CH 4 ), nitrogen dioxide (N 2 O), freons (CFCs), ozone (O 3 ), among which about 80% of carbon dioxide is a typical greenhouse gas. [0003] With the formal entry into force of the Tokyo Protocol in 2005, restrictions on carbon dioxide emissions are being strengthened, requiring active responses to global warming, and the development of industries and policies related to greenhouse gas emission restrictions. In response to such demands, research on carbon dioxide capture and storage (carbon capture & storage) is currently being actively ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C22B26/20C22B7/00B01D53/62B01D53/73
CPCC22B26/20C01F11/18C22B7/00B01D53/62B01D53/73Y02P10/20Y02P20/151C22B7/006C01P2004/61C01P2006/80Y02W30/20
Inventor 金明珍田俊赫
Owner KOREA MARITIME UNIV IND ACADEMIC COOPERATION FOUND
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