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Method for preparing hydrotalcite-like compounds by flue gas desulfurized waste residue

A technology of desulfurization waste residue and hydrotalcite, applied in chemical instruments and methods, solid waste removal, oxygen/ozone/oxide/hydroxide, etc., can solve high operating costs, magnesium salt pollution, non-compliance with clean production and Circular economy and other issues, to achieve the effect of low raw material cost and high added value

Inactive Publication Date: 2012-02-01
SUZHOU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In addition, the main substances in magnesium oxide desulfurization residues are diatomite (silicon dioxide), excess magnesium oxide, magnesium hydroxide, carbon powder, magnesium sulfate, magnesium sulfite, calcium oxide, aluminum oxide, etc.; There are three directions for the treatment of magnesium oxide desulfurization waste residue in power plants: (1) the by-products are completely regenerated and sulfuric acid is produced, but the calcination process is more complicated and the overall operating cost is also higher; (2) magnesium sulfite is used as the main desulfurization by-product directly for fertilizer, But the added value of the product is low; (3) direct discharge: magnesium salt will cause pollution, which does not meet the requirements of national clean production and circular economy

Method used

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  • Method for preparing hydrotalcite-like compounds by flue gas desulfurized waste residue
  • Method for preparing hydrotalcite-like compounds by flue gas desulfurized waste residue
  • Method for preparing hydrotalcite-like compounds by flue gas desulfurized waste residue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment one: see attached figure 1 The steps shown to prepare hydrotalcite-like:

[0026] In the first step, weigh 10.4g Al(OH) 3 (0.13mol, 3.25 parts) and 12g NaOH (0.3mol, 7.5 parts), put into 250ml beaker, add the deionized water (6.94mol, 173.5 parts) of 125ml, record the pH value of solution to be 13, be heated to solution Boiling to prepare aluminate solution A.

[0027] The second step is to analyze and detect the content of each element in the desulfurization waste residue containing Mg element, see image 3 ; Weigh 4.3g Na 2 CO 3 (0.04mol, 1 part) and desulfurization waste residue containing 0.19mol (4.75 parts) Mg element were added in solution A, fully stirred, and mixed evenly to obtain solution B, whose pH value was 12.

[0028]The third step is to pour solution B into a 500ml three-necked flask, react for 6 hours under the conditions of sufficient stirring and reflux condensation, then suction filter and wash with water to obtain filtrate C and sol...

Embodiment 2

[0035] Embodiment two: see attached figure 1 Preparation of hydrotalcite-like as shown:

[0036] The first step, weigh 20.8g Al(OH) 3 (0.26mol, 6.5 parts) and 24g NaOH (0.6mol, 15 parts), put into 500ml beaker, add the deionized water (13.88mol, 347 parts) of 250ml, record the pH value of solution to be 14, be heated to solution Boiling to prepare aluminate solution A.

[0037] The second step, weigh 8.6g Na 2 CO 3 (0.08mol, 2 parts) and desulfurization waste residue containing 0.38mol (9.5 parts) Mg element were added in solution A, fully stirred, and mixed evenly to obtain solution B, the pH value of solution B was about 12.

[0038] The third step is to pour solution B into a 1000ml three-necked flask, react for 5 hours under the conditions of sufficient stirring and reflux condensation, then suction filter and wash with water to obtain filtrate C and solid powder D. Powder D was dried at 100°C for 24 hours and ground to obtain hydrotalcite-like.

[0039] The fourth s...

Embodiment 3

[0044] Embodiment three: see attached figure 1 Preparation of hydrotalcite-like as shown:

[0045] The first step, weigh 20.8g Al(OH) 3 (0.26mol, 6.5 parts) and 24g NaOH (0.6mol, 15 parts), put into 500ml beaker, add the deionized water (13.88mol, 347 parts) of 250ml, record the pH value of solution to 13, be heated to solution Boiling to prepare aluminate solution A.

[0046] The second step, weigh 8.6g Na 2 CO 3 (0.08mol, 2 parts) and desulfurization waste residue containing 1.14mol (28.6 parts) of Mg element were added in solution A, fully stirred, and mixed evenly to obtain solution B, and the pH of solution B was measured to be about 12.

[0047] The third step is to pour solution B into a 1000ml three-necked flask, react for 5 hours under the conditions of sufficient stirring and reflux condensation, then suction filter and wash with water to obtain filtrate C and solid powder D. Powder D was dried at 100°C for 24 hours and ground to obtain hydrotalcite-like.

[00...

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Abstract

The invention relates to a method for preparing hydrotalcite-like compounds by flue gas desulfurized waste residue, belonging to the technical field of flue gas desulfurized waste residue recycling and inorganic stratified material preparation. The method comprises the following steps: 1) dissolving NaOH and Al(OH)3 in 150-200 parts of water, regulating pH value of the solution to be 13-14, and heating to boiling point to obtain aluminate solution A; 2) detecting content of each element of the desulfurized waste residue, adding desulfurized waste residue containing Mg in solution A, adding Na2CO3, regulating pH value of the solution to be 11-12, and stirring fully and uniformly to obtain solution B; and stirring fully, vehiclerying out backflow condensation, reacting for 5-8h, leaching, washing to obtain filter liquor C and solid powder D, drying and grinding the solid powder D to obtain hydrotalcite-like compounds, and further utilizing Mg, Al and other elements contained in the filter liquor C to prepare hydrotalcite-like compounds in a cyclic manner. In the invention, filter liquor can be fully utilized in cyclic manner, no high-concentration waste liquor is discharged, and theproduction technology is environment friendly.

Description

technical field [0001] The invention belongs to the field of recycling waste residue from flue gas desulfurization and the field of preparation of inorganic layered materials, and relates to a method for preparing hydrotalcite-like by using waste residue from flue gas desulfurization. Background technique [0002] Hydrotalcite (Layered Double Hydrotalcides, LDHs) is a new type of mineral material similar to montmorillonite. The typical chemical formula of magnesium aluminum hydrotalcite is: [Mg 6 Al 2 (OH) 16 CO 3 ]·4H 2 O. When the composition of hydrotalcite Mg 2+ 、Al 3+ Hydrotalcite-like compounds (HTLcs) are formed when they are replaced by other metal ions of the same price. As a class of functional inorganic materials with a layered structure, the general formula of hydrotalcite and hydrotalcite-like can be expressed as [M 2+ 1-x m 3+ x (OH) 2 ][A n- ] x / n mH 2 O, where M 2+ are divalent metal cations, including Mg 2+ , Fe 2+ 、Co 2+ 、Ni 2+ 、Cu 2+ ,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C01B13/36
Inventor 董延茂赵丹
Owner SUZHOU UNIV OF SCI & TECH
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