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Ardealite pretreatment method and application thereof

A phosphogypsum and pretreatment technology, applied in the field of building materials, can solve the problems of low degree of resource utilization of phosphogypsum, poor product performance, poor mechanical properties, etc., and achieves easy control of setting time, large-scale treatment, and good performance. Effect

Inactive Publication Date: 2020-08-07
CHINA NAT BUILDING MATERIALS TECHCAL INNOVATION & RES INST LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2013, the production of phosphogypsum in my country was 70 million tons, accounting for 38% of the by-product gypsum, but the resource utilization of phosphogypsum is very low, and the utilization rate is only 27.4%.
The main reasons are: 1. Compared with natural gypsum, there are a lot of impurities in phosphogypsum, which leads to poor product performance; 2. At present, most of the building materials and products made of phosphogypsum use high-temperature calcination process to prepare phosphogypsum into β-type Hemihydrate gypsum, its water demand is too high, its mechanical properties are poor, and high-temperature calcination consumes a lot of heat energy, high cost and not environmentally friendly

Method used

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  • Ardealite pretreatment method and application thereof
  • Ardealite pretreatment method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Phosphogypsum pretreatment:

[0060] 10,000 grams of bulk phosphogypsum is screened out through a 70-mesh sieve; the obtained phosphogypsum is placed in a ball mill (Wuxi Jianyi Instrument Machinery Co., Ltd., SM-500TEST MILL) for grinding, and ground to 70-90 mesh; The ground phosphogypsum is irradiated in a microwave field (Guangzhou Wancheng Microwave Equipment Co., Ltd., CNWB), microwave technical parameters: 2.45GHz, power 560W in a microwave field, heating rate 70°C / min, time 5min; Calcining the phosphogypsum after microwave irradiation at 150° C. for 70 minutes; aging the calcined phosphogypsum in an environment with a humidity RH of 0-30%, when the crystal water content of the obtained gypsum is 4.5-5% by weight, type AIII When the content of the anhydrite is 1-3% by weight, the aging treatment is stopped; the pH value of the phosphogypsum after the aging treatment is tested to be 5.6.

[0061] Preparation of phosphogypsum plasterboard:

[0062] Weigh 1000g of...

Embodiment 2

[0076] The pretreatment process of phosphogypsum is the same as that in Example 1, and the treated phosphogypsum is used to prepare self-leveling floor mortar.

[0077] 100 parts by weight of pretreated phosphogypsum, 15 parts by weight of 40-70 mesh fine river sand, 15 parts by weight of 70-140 mesh fine river sand, 8 parts by weight of cement, polycarboxylate water reducer 0.2 parts by weight, efficient gypsum base retarder Retardan P 0.03 parts by weight, 2 parts by weight of 5010N and 0.03 parts by weight of stabilizer Starvis 3040F were mixed evenly to obtain phosphogypsum self-leveling mortar, which was then mixed with 24 parts by weight of water to obtain phosphogypsum self-leveling slurry.

[0078] The performance test was carried out according to the industry standard JC / T 1023-2007 "Gypsum-based self-leveling mortar", and the results are shown in Table 2.

[0079] Table 2 Performance of phosphogypsum self-leveling floor mortar

[0080]

[0081]

[0082] It ...

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Abstract

The invention discloses an ardealite pretreatment method. The ardealite pretreatment method comprises the following steps: sieving large blocks of ardealite; grinding the sieved large ardealite blocks; placing the ground ardealite in a microwave field for irradiation, and raising a temperature; calcining the ardealite having undergone microwave irradiation; aging the calcined ardealite; and testing the pH value of the aged ardealite, and if the pH value is not within the range of 5-7, adjusting the pH value to 5-7. The invention further discloses an ardealite gypsum plaster board and a preparation method thereof. By means of the ardealite pretreatment method, the setting time and strength of ardealite are improved, and ardealite can be successfully added into a gypsum plaster board. The invention further provides ardealite self-leveling mortar and a preparation method thereof. The performance of the ardealite self-leveling mortar meets standard requirements prescribed in JC / T 1023-2007.

Description

technical field [0001] The present application relates to the field of building materials, in particular, but not limited to, a phosphogypsum pretreatment method, a phosphogypsum paper-faced gypsum board and a preparation method thereof, and a phosphogypsum self-leveling mortar and a preparation method thereof. Background technique [0002] Phosphogypsum is a by-product of the wet process of phosphoric acid production. In 2013, the production of phosphogypsum in my country was 70 million tons, accounting for 38% of the by-product gypsum, but the resource utilization of phosphogypsum was very low, and the utilization rate was only 27.4%. [0003] At present, phosphogypsum is mainly used to produce low-value-added products such as cement retarder, gypsum brick, and gypsum block. Due to the general performance of these low-value-added products, they are not competitive in the market. The main reasons are: 1. Compared with natural gypsum, there are a lot of impurities in phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B11/02C04B28/14
CPCC04B11/266C04B11/02C04B28/144C04B2111/28C04B2201/50C04B24/38C04B22/14C04B2103/302C04B2103/22
Inventor 王丽陈红霞朱清玮白风华冉秀云
Owner CHINA NAT BUILDING MATERIALS TECHCAL INNOVATION & RES INST LIMITED
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