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Modified phosphogypsum powder and product thereof

A technology of gypsum powder, phosphogypsum, used in climate sustainability, sustainable waste treatment, solid waste management, etc.

Inactive Publication Date: 2012-07-04
ANHUI DEJIA NEW BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]2. Waste of energy: about 60kg of standard coal is required for each ton of building gypsum powder produced by the calcination method. Based on the annual output of 100,000 tons, the total coal consumption is about 6,000 tons, costing about 4 million yuan, increasing production costs and reducing economic benefits
[0008]3. Cause secondary pollution: During coal combustion, a large amount of CO2 and SO2 acidity will be produced gas
[0009]4. The process is long, the equipment is complicated, the investment is large, the production is slow, and the benefit is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1. Preparation of modified phosphogypsum powder.

[0028] Preparation of crystal modifier solution: Take 0.7kg of aluminum sulfate and 0.3kg of iron sulfate and put them into 4kg of water to make an aqueous solution for later use.

[0029] Preparation of activator powder: take 10kg of quicklime with CaO content ≥ 80%, 5kg of alum slag, Al 2 o 3 Add 9 kg of high alumina clay with a ratio of ≥70%, put the three kinds of raw materials into a mill, and grind to control the fineness to 0.08mm, and the sieve balance of the square hole sieve is not more than 10%, and set aside.

[0030] Production of modified phosphogypsum powder: Take 75kg of phosphogypsum that has been dispersed and have a particle size not greater than 5mm, put it into a wheel mill mixer, and then put in the above-mentioned activator powder and crystal modifier solution in turn, and mix them through full rolling. Prepare modified phosphogypsum; send the modified phosphogypsum to the warehouse for...

Embodiment 2

[0031] Example 2. Preparation of modified phosphogypsum powder.

[0032] Preparation of crystal transmutant solution: Take 1kg of aluminum sulfate, 0.5kg of iron sulfate, and 0.5kg of sodium sulfate, and put them into 4kg of water to make an aqueous solution for later use.

[0033] Preparation of activator powder: take 9kg of quicklime with CaO content ≥ 80%, 4kg of cement above PO42.5, 7kg of alum slag, Al 2 o 3 ≥70% high alumina 5kg, put four kinds of raw materials into the mill to grind, the fineness is controlled to be 0.08mm, and the sieve balance of the square hole sieve is not more than 10%, and it is set aside.

[0034] Production of modified phosphogypsum powder: Take 73kg of phosphogypsum that has been dispersed and have a particle size not greater than 5mm, put it into a wheel mill mixer, and then put it into the above-mentioned activator powder and crystal modifier solution in sequence, and its production method is the same as in the embodiment 1.

Embodiment 3

[0035] Example 3. Preparation of solid bricks with modified phosphogypsum powder.

[0036] Add 50kg of modified phosphogypsum powder, 25kg of fly ash, and 20kg of crushed stone into the wheel mill and mix them for 1 minute. Add 16kg of water and continue to mix them for 5 minutes. The conveyor is sent into the forming machine, vibrated and pressurized, and made into a solid brick of 240×115×53mm. The formed body is covered with plastic film and subjected to damp heat curing for 28 days. After 28 days of testing: the density level is B, 1620kg / m 3 , compressive strength 18.6Mpa, for MU15 load-bearing bricks, 15 freeze-thaw cycle mass loss 6.2%, compressive loss 10.7%, softening coefficient 0.87. All indicators fully meet the standards of GB / T21144-2007 "Concrete Solid Bricks".

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Abstract

The invention relates to a modified phosphorus gypsum powder and a product thereof and belongs to the technical field of phosphorus chemical engineering or building material. The invention aims to provide a modified phosphorus gypsum powder which needs no calcination, improves quality, saves energy, increases benefit and protects environment and a product thereof. The invention comprises the following main technical point: 70 to 75 portions of phosphorus gypsum, 1 to 5 portions of a crystal transformation agent and 20 to 25 portions of an activating agent; the crystal transformation agent is one or more than two of aluminium sulfate, ferric sulfate and sodium sulfate; the activating agent is one or more than two of slag, cement, quicklime, alum slag and high bauxite; the material compositions of the crystal transformation agent are prepared to form an aqueous solution; the raw materials of the activating agent are mixed and grinded to form a powder body; the agglomerated phosphorus gypsum is shattered, is thrown into a wheel grinding and mixing machine, is subjected to roller compaction and mixing and is cured for 24 hours around; when free water is detected not more than 3 percent, the phosphorus gypsum is thrown into a pulverizer; the fineness is controlled to be 0.08 mm; and the modified phosphorus gypsum powder is obtained. The modified phosphorus gypsum powder has remarkable economic, social and environmental benefits.

Description

technical field [0001] The invention relates to a modified phosphogypsum powder and its products, belonging to the technical field of phosphorus chemical industry or building materials. Background technique [0002] Phosphogypsum is the production process of phosphoric acid by wet process. Phosphate rock reacts with sulfuric acid to generate phosphoric acid and calcium sulfate dihydrate (CaSO 4 2H 2 O) Phosphogypsum as the main component. Its reaction equation is as follows: [0003] 3C a3 (PO 4 ) 2 ·C a f 2 +10H 2 SO 4 +20H 2 O→6H 3 PO 4 +10C a SO 4 2H 2 O+2HF [0004] According to data, in 2007 my country produced about 30 million tons of phosphogypsum, and it is estimated that the output of phosphogypsum will reach 50 million tons by 2010. At present, there are about 160 million tons of phosphogypsum stockpiled in the country, and the utilization rate is only about 10%. The stockpiling of a large amount of phosphogypsum has caused great economic pressure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/30C04B11/26C04B28/14C04B18/08C04B14/02
CPCY02W30/91
Inventor 刘宝珠杜绍阳
Owner ANHUI DEJIA NEW BUILDING MATERIALS
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