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Preparation method of phosphogypsum lightweight building block with low water cement ratio

A technology of phosphogypsum and water-cement ratio, which is applied in the direction of ice making, ice making, ceramic products, etc., can solve the problem that the water-cement ratio cannot be too high, and achieve the effects of improving turnover efficiency, satisfying strength, and reducing the amount of raw materials

Pending Publication Date: 2022-03-15
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that it is necessary to ensure sufficient hydration of phosphogypsum and control the water-cement ratio not to be too high. The traditional high-water-cement ratio mixing method has insurmountable defects.

Method used

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  • Preparation method of phosphogypsum lightweight building block with low water cement ratio
  • Preparation method of phosphogypsum lightweight building block with low water cement ratio
  • Preparation method of phosphogypsum lightweight building block with low water cement ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 Among them, a kind of preparation method of phosphogypsum lightweight block with low water-cement ratio comprises the following steps:

[0047] s1. Prepare ice particles according to the optimal water-cement mass ratio;

[0048] In a preferred solution, the particle size of the ice particles is 0.75 cm to 2.00 cm. In a further preferred solution, the ice particles are graded ice particles, for example, 0.75cm, 1cm, 1.5cm, and 2cm each account for 25% by mass. According to the requirements of the final product, it can also be other gradation ratios, and ice with different particle sizes The grains are mixed for later use.

[0049] In a preferred solution, the water used to prepare the ice particles contains an accelerator with a mass ratio of 0.3% to 1.0%.

[0050] In the preferred scheme, the quick-setting agent includes K 2 SO 4 .

[0051] Alternative options such as figure 2 In this method, ice particles are prepared by using double-layered si...

Embodiment 2

[0064] On the basis of Example 1, a low water-cement ratio phosphogypsum lightweight block or bar is prepared by using tap water to prepare ice particles, preferably round, the quality is equal to that of liquid water, and the diameter of the ice particles is 1.0 cm. According to the optimal water-cement ratio, that is, the ratio of the mass of water to the mass of dry phosphogypsum powder, quickly mix the ice particles and phosphogypsum powder evenly, and then according to the predetermined dry density, in this example, it is 0.7~1.0 g / cm 3 1. Pour the mixture of accurately measured ice particles and phosphogypsum powder into the mold, and use the press 7 to compact it to a predetermined volume; after the ice melts, the blocks or bars are demoulded after initial setting. Such as Figure 8 In the above, the phosphogypsum filled with ice particles can retain the cavity, and the hollow rate of the block is calculated by controlling the number of ice particles.

[0065] Use 0.5%...

Embodiment 3

[0078] 1. Add 50kg of tap water, add 250g of quick-setting agent, dissolve and stir evenly, pour it into a 1.5cm-sized silicone mold, and put it in the freezing area.

[0079] 2. After the ice pellets are frozen and formed, the machine is demoulded, weigh 50kg of ice pellets and 150kg of phosphogypsum according to the water-cement ratio of 33:100, pour them into the mixing chamber at the same time, and roll and stir for 15-20 seconds.

[0080] 3. After mixing evenly, feed into multiple molds. The internal length, width and height of each mold are 600mm×500mm×200mm.

[0081] 4. The preset dry density of block 9 is 0.7g / cm 3 , use pressure equipment to compact the mixture in the block mold to the predetermined volume, which is 60000cm 3 , completed within 20~30 seconds.

[0082] 5. Remove the mold loaded with blocks as a whole, and put it in the waiting area for 20-25 minutes, waiting for the ice particles to fully melt and the final setting of phosphogypsum to be basically co...

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Abstract

The invention provides a preparation method of a low-water-cement-ratio phosphogypsum lightweight building block. The preparation method comprises the following steps: preparing ice particles according to an optimal water-cement mass ratio; preparing ardealite powder according to the mass of the ice particles, and uniformly mixing the ardealite powder with the ice particles; pouring the mixture of the ardealite powder and the ice particles into a mold, and compacting by a press machine; after ice particles are melted and phosphogypsum is initially set, demolding is performed; the low-water-cement-ratio phosphogypsum light building block is obtained through the steps. The ardealite block or strip block can be prepared under the optimal water content condition, it is guaranteed that ardealite is fully hydrated, the strength meets the requirement, and the problem of ardealite cracking caused by excessive water is avoided. The hollow volume can be estimated according to the number of added ice particles, the hollow rate of the phosphogypsum building block or strip block is freely controlled, a light product is prepared, the use amount of raw materials is reduced, and the phosphogypsum block or strip block can be used for wall filling and heat insulation.

Description

technical field [0001] The invention relates to the field of new building materials, in particular to a method for preparing a lightweight phosphogypsum block with a low water-cement ratio. Background technique [0002] With the prohibition of river sand mining and the restriction of machine-made sand, the contradiction between supply and demand of building wall materials has become increasingly prominent. In order to break through this dilemma, it is necessary to seek new sources of materials. Phosphogypsum slag is an industrial by-product left over from the production of phosphate fertilizer and phosphoric acid from phosphate rock, and its main component is calcium sulfate dihydrate. Due to the low utilization rate of phosphogypsum as a resource, its stockpile is increasing day by day, which not only occupies a large amount of land, but also poses a risk of environmental pollution. In order to alleviate the storage pressure and promote the healthy development of the phos...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B38/04C04B40/02B28B3/04B28B7/22F25C1/22F25C1/10C04B111/27C04B111/40
CPCC04B28/143C04B38/04C04B40/0259B28B3/04B28B7/22F25C1/22F25C1/10C04B2201/20C04B2111/27C04B2111/40C04B22/147
Inventor 谈云志王媛李辉吴军韩爽
Owner CHINA THREE GORGES UNIV
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