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Polycrystal binder based on ardealite or building gypsum, preparation method and application

A technology of building gypsum and phosphogypsum, which is applied in the field of inorganic non-metallic materials and building materials, and can solve the problems of increasing, accumulative accumulation, and low utilization rate of phosphogypsum

Pending Publication Date: 2019-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the various technical solutions provided in the above-mentioned patents can solve this problem economically and efficiently, which is the root cause of the low utilization rate of phosphogypsum and the huge and continuously increasing accumulation of phosphogypsum worldwide

Method used

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  • Polycrystal binder based on ardealite or building gypsum, preparation method and application
  • Polycrystal binder based on ardealite or building gypsum, preparation method and application
  • Polycrystal binder based on ardealite or building gypsum, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~ Embodiment 3

[0052] The phosphogypsum-based polycrystalline cement slurry in Examples 1 to 3 is prepared by mixing dehydrated phosphogypsum powder, light-burned magnesium oxide powder, halogen flakes and water. See Table 2 for its composition and proportion. Among them, dehydrated phosphogypsum powder was prepared in Comparative Example 1; light-burned magnesia was purchased from an enterprise in Haicheng City, Liaoning Province, and its chemical composition is shown in Table 3; magnesium chloride is a by-product of a seawater salt production enterprise in Tianjin-halogen flakes , its MgCl 2 ·6H 2 The O content is about 98%.

[0053] Composition and compounding ratio (mass %) of slurry in table 2 embodiment 1~3

[0054] Example

[0055] Table 3 Chemical composition of lightly burned magnesite powder

[0056] chemical composition

[0057]Examples 2 to 4 all use the "slurry preparation method" to mix the phosphogypsum-based polycrystalline cement slurry. After the slur...

Embodiment 4~ Embodiment 6

[0059] The phosphogypsum-based polycrystalline cementitious material powder in Examples 4 to 6 is prepared by mixing dehydrated phosphogypsum powder, light-burned magnesium oxide powder and halogen powder, and its composition and proportion are shown in Table 4. The selected dehydrated phosphogypsum powder, light-burned magnesium oxide powder, and halogen sheet are the same as those in Examples 1-3.

[0060] Composition and compounding ratio (mass %) of powder in table 4 embodiment 5~6

[0061] Example

Dehydrated Phosphogypsum

Light Burned Magnesium Oxide

Halogen powder (MgCl 2 ·6H 2 O)

Example 4

39.5

36.1

24.4

Example 5

52.7

28.2

19.1

Example 6

61.4

23.1

15.5

[0062] The strength test results of phosphogypsum-based polycrystalline cement specimens in Table 5 Examples 2 to 6

[0063]

[0064] Examples 4-6 all use the "powder preparation method" to mix the three-component materials such as dehydr...

Embodiment 7~ Embodiment 9

[0066] The building gypsum-based polycrystalline cementitious material powder in embodiment 7~embodiment 9 is made of building gypsum powder, active MgO (chemically pure) and magnesium chloride tetrahydrate (MgCl 2 4H 2 O) and other three-component materials constitute, and its composition and proportioning are shown in Table 6. First, the "powder preparation method" is used to mix the three-component materials evenly to prepare polycrystalline cement powder.

[0067] Examples 7-9 all adopt the "slurry preparation method" to mix and prepare building gypsum-based polycrystalline cement paste. When mixing, the mass ratios of water and powder are 0.45, 0.42 and 0.40 respectively. After the slurry is evenly mixed, it is poured into cube and prism steel test molds, and cured in an environment of 25°C±2°C for 1 day. Remove the mold, put it in a plastic bag and continue curing at 25°C±2°C for 28 days, and test the strength of 1 day (d), 3 days and 15 days respectively. The test res...

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Abstract

The invention discloses a polycrystal binder based on ardealite or building gypsum, a preparation method and application. The polycrystal binder is prepared form the following components: dehydrated ardealite or building gypsum, magnesium chloride, active magnesium oxide and water, wherein preparation of the dehydrated ardealite requires no any deacidification treatment, and powder which takes calcium sulfate hemihydrates or soluble anhydrous calcium sulfate as a main component can be obtained by directly heating and dehydrating raw slag which is discharged during a process of enabling phosphate ore to react with sulfuric acid for preparing phosphoric acid and takes calcium sulfate as a main component in an opened or closed environment of which the temperature is 120 to 180 DEG C or 200 to 360 DEG C. According to the polycrystal binder disclosed by the invention, a new technology of economic and efficient utilization of the ardealite is provided, and the novel polycrystal binder has excellent physical and mechanical properties and has prominent characteristics of high strength and good water resistance; a large amount of all kinds of industrial byproducts-gypsum can be utilized, and multiple social benefits of environment protection, economy, new materials and the like are obtained. The preparation method of the novel polycrystal binder is easy, and the energy consumption is low.

Description

technical field [0001] The invention relates to a phosphogypsum or building gypsum-based polycrystalline phase cementing material, a preparation method and application, and belongs to the technical field of inorganic non-metallic materials and building materials. Background technique [0002] Phosphogypsum is a solid waste discharged during the production of phosphoric acid and phosphate fertilizer. In the process of decomposing phosphate rock (apatite) with sulfuric acid to produce phosphoric acid, calcium sulfate dihydrate CaSO 4 2H 2 O as the main component of the residue - phosphogypsum. [0003] Ca 5 (PO 4 ) 3 X+5H 2 SO 4 +10H 2 O→3H 3 PO 4 +5(CaSO 4 2H 2 O)+HX [0004] In the formula, X can be OH - , F - , Cl - and Br - and other anions. [0005] Every ton of phosphoric acid produces 4.5-5 tons of phosphogypsum, and every ton of diammonium phosphate fertilizer produces 2.5-5.0 tons of phosphogypsum. According to the statistics of the Florida Phosphate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/28C04B28/32
Inventor 邓德华李珂刘赞群元强吴晓燕
Owner CENT SOUTH UNIV
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