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A kind of preparation method of gypsum micropowder and the application of the gypsum micropowder

A production method and gypsum technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of flexural resistance, low compressive strength, limited application range, and low processing capacity of phosphogypsum, and achieve long initial setting time, Avoid agglomeration phenomenon, retarding effect is better and significant effect

Inactive Publication Date: 2018-03-13
GUIZHOU KAILIN PHOSPHOGYPSUM INTEGRATION UTILIZATION
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The quality of the product is poor, so that the flexural and compressive strength of the product prepared from it as a raw material is low, which cannot fully meet the strength requirements of the product, and the water resistance is poor and the softening coefficient is low, which is likely to cause safety hazards ; The setting time is short, it is inconvenient to process products, and the addition of retarder leads to higher cost and lower strength; (2) During the calcination process, its energy consumption is large, which is likely to cause secondary pollution; (3) The process is long , complex equipment and high cost; (4) the activity of the obtained gypsum powder is low, the application range is relatively limited, and the processing capacity of phosphogypsum is low

Method used

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Examples

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Effect test

Embodiment 1

[0028] A method for making gypsum micropowder. After removing free water from phosphogypsum, put it in a grinder and grind it to a fineness of 600 mesh, and control its sieve rate to 93%, and add phosphogypsum to remove the phosphogypsum during the grinding process. 0.01% additive by weight after removing free water. Described additive, it is stearic acid. Phosphogypsum is treated at a temperature of 55°C to constant weight to remove free water.

Embodiment 2

[0030] A method for making gypsum micropowder. After removing free water from phosphogypsum, put it in a grinder and grind it to a fineness of 700 mesh, and control its sieve rate to 97%, and add phosphogypsum to remove the phosphogypsum during the grinding process. 0.1% additive by weight after removing free water. Described additive, it is the mixture of stearic acid, paraffin, barium cadmium stabilizer, barium zinc stabilizer.

Embodiment 3

[0032] A method for making gypsum micropowder. After removing free water from phosphogypsum, put it in a grinder and grind it to a fineness of 1200 mesh, and control its sieve rate to 93%, and add phosphogypsum to remove the phosphogypsum during the grinding process. 0.05% additive by weight after removing free water. Described additive, it is the mixture of stearic acid and stearate, paraffin, barium cadmium stabilizer, barium zinc stabilizer. Described stearate is zinc stearate. Phosphogypsum is treated at a temperature of 65°C to constant weight to remove free water.

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PUM

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Abstract

The invention relates to the technical field of gypsum modification, in particular to a fabrication method and application of gypsum micro powder. Free water of ardealite is removed, then ardealite is ground till the degree of fineness reaches 600 meshes or above, the sieving rate is controlled to be 93% or above, and meanwhile an additive is added so that activity of the gypsum micro powder can be high, water resistance can be excellent, particularly it is difficult for the gypsum micro powder to absorb moisture in the air, agglomeration can be avoided, the shelf life of the gypsum micro powder can be long, and quality can be good; besides, when the gypsum micro powder is used for preparing corresponding products, fracture resistance and compression resistance are excellent, and the softening coefficient is excellent; presetting time is long, and the product preparation process is convenient to conduct.

Description

technical field [0001] The invention relates to the technical field of gypsum modification, in particular to a preparation method of gypsum micropowder and the application of the gypsum micropowder. 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. 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 on the production enterprises and caused serious harm to the ecological environment. The State Environmental Protection Administration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46
CPCC01F11/46
Inventor 杨步雷
Owner GUIZHOU KAILIN PHOSPHOGYPSUM INTEGRATION UTILIZATION
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