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A kind of bonding gypsum powder and preparation method thereof

A technology of gypsum powder and phosphogypsum, which is applied in the field of bonded gypsum powder and its preparation, can solve the problems of human health and ecological environment hazards, occupy a large area of ​​land, increase costs, etc., and achieve reduced production costs, satisfactory mechanical properties, and cohesion enhanced effect

Active Publication Date: 2021-10-26
BEIJING NEW BUILDING MATERIALS PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because phosphogypsum contains harmful substances, its large amount of discharge not only increases the cost, occupies a large area for stacking, but also pollutes the environment and brings harm to human health and the ecological environment.

Method used

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  • A kind of bonding gypsum powder and preparation method thereof
  • A kind of bonding gypsum powder and preparation method thereof
  • A kind of bonding gypsum powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The harmless treatment of phosphogypsum to prepare phosphogypsum powder, the specific steps are as follows:

[0050] Step 1: Adjust the pH of phosphogypsum to 7.2 with quicklime powder.

[0051] Step 2: Calcining the phosphogypsum obtained in Step 1 in a horse-boiler furnace at 170°C for 2 hours, aging for 48 hours, pulverizing for 5 minutes, and passing through an 80-mesh sieve, wherein the powder content that can pass through a 200-mesh sieve is 35%.

[0052] Step 3: Add magnesium fluorosilicate to the phosphogypsum powder obtained in step 2, the weight ratio of phosphogypsum powder to magnesium fluorosilicate is 100:6, fully stir, and continue aging for 24 hours to obtain harmless pretreated Phosphogypsum powder.

Embodiment 2

[0054] The harmless treatment of phosphogypsum to prepare phosphogypsum powder, the specific steps are as follows:

[0055] Step 1: Adjust the pH of phosphogypsum to 6.8 with quicklime powder.

[0056] Step 2: Calcining the phosphogypsum obtained in Step 1 in a horse-boiler furnace at 160°C for 2 hours, aging for 48 hours, grinding for 5 minutes, and passing through an 80-mesh sieve, wherein the powder content that can pass through a 200-mesh sieve is 32%.

[0057] Step 3: Add sodium fluorosilicate to the phosphogypsum powder obtained in step 2, the weight ratio of phosphogypsum powder to sodium fluorosilicate is 100:8, fully stir, and continue to age for 24 hours to obtain harmless treated phosphorus Gypsum powder.

Embodiment 3

[0059] The harmless treatment of phosphogypsum to prepare phosphogypsum powder, the specific steps are as follows:

[0060] Step 1: Adjust the pH of phosphogypsum to 7.7 with quicklime powder.

[0061] Step 2: Calcining the phosphogypsum obtained in Step 1 in a horse-boiler furnace at 190°C for 2 hours, aging for 48 hours, grinding for 5 minutes, and passing through an 80-mesh sieve, wherein the powder content that can pass through a 200-mesh sieve is 38%.

[0062] Step 3: adding N-methylolacrylamide and salicylic acid to the phosphogypsum powder obtained in step 2, the weight ratio of phosphogypsum powder to N-methylolacrylamide and salicylic acid is 100:10:6, Stir well and continue to age for 24 hours to obtain harmless treated phosphogypsum powder.

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Abstract

A kind of bonding gypsum powder and preparation method thereof, described bonding gypsum powder comprises 100 parts by weight of phosphogypsum, 5-20 parts by weight of heavy calcium, 10-20 parts by weight of fly ash, 5-15 parts by weight of white cement, 1 ‑5 parts by weight retarder, 5‑20 parts by weight of redispersible latex powder and 5‑25 parts by weight of water retaining agent. The method comprises the following steps: adjusting the pH of the phosphogypsum to neutral or slightly alkaline, calcining for a period of time, aging once, grinding, and sieving; adding a curing agent, stirring evenly, and aging twice to obtain a harmless Pretreated phosphogypsum; uniformly mix harmless pretreated phosphogypsum, heavy calcium, fly ash, white cement, retarder, redispersible latex powder and water retaining agent to obtain bonded gypsum powder. The application opens up an effective way to realize the reuse of phosphogypsum, and the properties of the prepared bonded gypsum powder all meet the national standards.

Description

technical field [0001] This application relates to but not limited to the field of building materials, in particular but not limited to a bonded gypsum powder and a preparation method thereof. Background technique [0002] Phosphogypsum is an industrial by-product of the process of preparing phosphoric acid by wet method. About 5 tons of phosphogypsum are produced for every ton of phosphoric acid produced. At present, the accumulated stock of phosphogypsum in my country has exceeded 300 million tons. The annual cost of phosphogypsum stacking is as high as several million yuan. Because phosphogypsum contains harmful substances, its massive discharge will not only increase the cost, occupy a large area for stacking, but also pollute the environment and bring harm to human health and the ecological environment. [0003] Therefore, there is a need for the development of resource utilization approaches for phosphogypsum. Contents of the invention [0004] The following is an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
CPCC04B28/143C04B2201/50C04B14/28C04B18/08C04B7/02C04B24/06C04B22/16C04B22/0013C04B24/14C04B2103/0057C04B24/383C04B24/2652C04B24/2641
Inventor 尹东杰王莹王鹏起何亮谭丹君
Owner BEIJING NEW BUILDING MATERIALS PLC