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Ardealite supersulfated cement and preparation method thereof

A technology of supersulfate cement and phosphogypsum is applied in the field of building materials, which can solve the problems of soluble phosphorus pollution and low removal rate of soluble phosphorus, and achieve the effect of improving the flexural and compressive strength and the removal effect.

Inactive Publication Date: 2018-12-07
JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"A Phosphorus Slag Super Sulfate Cement and Its Preparation Method" (Application No.: CN201210408576.2), "A Titanium Slag Doped Super Sulfate Cement and Its Preparation Method" (Application No.: CN201310374788.8) and other inventions disclosed Modified phosphogypsum is used as the sulfate activator in super sulfate cement, but this type of invention does not specify the modification process, or only mixes the components according to the proportion and then calcines them at a low temperature of 400-500 °C It is prepared in 1 to 2 hours, but the calcium hydrogen phosphate and eutectic phosphorus in phosphogypsum cannot form insoluble salt at low temperature, and the removal rate of soluble phosphorus is low, so the problem of soluble phosphorus pollution in phosphogypsum has not been solved.

Method used

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  • Ardealite supersulfated cement and preparation method thereof
  • Ardealite supersulfated cement and preparation method thereof
  • Ardealite supersulfated cement and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0019] First, modify the phosphogypsum: neutralize the phosphogypsum with calcium oxide to neutral and age for 24 hours, calcinate the neutralized phosphogypsum at 660°C for 1 hour, and grind it after cooling. The specific surface area is 430m 2 / kg. By weight, take 80 parts of slag micropowder, 11.5 parts of modified phosphogypsum, 3 parts of calcium carbonate, 5 parts of Portland cement, and 0.5 part of lithium carbonate, and put them into the mixer for 30 minutes and 58 rpm / min to obtain 100 parts of phosphogypsum super sulfate cement.

Embodiment 2

[0021] First, modify the phosphogypsum: neutralize the phosphogypsum with calcium hydroxide to neutral and age for 24 hours, calcinate the neutralized phosphogypsum at 700°C for 0.8 hours, and grind it after cooling. The specific surface area after grinding is 450m 2 / kg. By weight, take 70 parts of slag fine powder, 18 parts of modified phosphogypsum, 3.9 parts of metakaolin, 6 parts of Portland cement, 2 parts of high alumina cement, and 0.1 part of lithium hydroxide, and put them into the mixer. For 25 minutes, the stirring speed was 60 rpm to obtain 100 parts of phosphogypsum super sulfate cement.

Embodiment 3

[0023] First, modify the phosphogypsum: neutralize the phosphogypsum with calcium hydroxide to neutral and age for 24 hours, calcinate the neutralized phosphogypsum at 730°C for 0.8h, and grind it after cooling. The specific surface area after grinding is 470m 2 / kg. By weight, take 65.8 parts of slag micropowder, 25 parts of modified phosphogypsum, 8 parts of Portland cement, 1 part of calcium hydroxide, and 0.2 part of sodium aluminate, and put them into a mixer, stirring for 35 minutes, and the stirring speed 62 rev / min, obtain 100 parts of phosphogypsum super sulfate cement.

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Abstract

The invention discloses an ardealite supersulfated cement and a preparation method thereof. The ardealite supersulfated cement disclosed by the invention contains the following components by weight percent: 50%-80% of superfine slag powder, 10%-40% of modified ardealite, 0%-10% of mineral admixture, 1%-8% of alkaline excitant and 0.1%-0.5% of early strength agent. The preparation method disclosedby the invention comprises the following steps: (1) modifying ardealite: neutralizing by doping calcium hydroxide or calcium carbonate into ardealite, performing high-temperature calcinations on the neutralized ardealite, cooling and then milling till the specific area is not less than 400m2 / kg, thereby acquiring the modified ardealite; (2) mixing superfine slag powder, modified ardealite, mineraladmixture, alkaline excitant and early strength agent in parts by weight, and then uniformly stirring, thereby acquiring the ardealite supersulfated cement. According to the preparation method disclosed by the invention, the influence of harmful elements in ardealite can be effectively eliminated and the ardealite is fully utilized.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a phosphogypsum super sulfate cement and a preparation method thereof. Background technique [0002] In order to ensure the needs of agricultural production, my country needs to consume a large amount of phosphate fertilizer every year, and the production of one ton (P 2 o 5 100%) high-concentration phosphate fertilizer discharges about 5-6 tons of phosphogypsum. According to the data provided by the China Phosphate Fertilizer Association, my country discharged about 75 million tons of phosphogypsum in 2016, and the overall utilization rate of phosphogypsum was 36.0%. A large amount of unused phosphogypsum has to be stored and disposed of, which not only occupies land, but also pollutes water sources. Compared with desulfurization gypsum and other industrial by-product gypsum, phosphogypsum mainly has many unfavorable factors such as strong acidity and harmful elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/16
CPCC04B28/165C04B18/141C04B14/28C04B7/02C04B22/10C04B14/106C04B7/32C04B22/062C04B22/064C04B22/0093
Inventor 刘丽娟唐永波万建东马红青
Owner JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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