A kind of preparation method of gypsum retarder

Abstract

The invention provides a method for preparing a calcium sulphate retarder from inorganic materials, such as coal ashes and slag. The method specifically comprises the steps of mixing the coal ashes, the slag, sodium hydroxide, water glass and water evenly, and then carrying out pouring and molding; and drying, crushing and grinding after curing to prepare an inorganic retarder. The obtained retarder is capable of effectively adjusting the setting time of a gypsum material, and has a relatively small influence on the strength of the gypsum material; and meanwhile, the preparation method is low in production cost and wide in material source, a lot of industrial waste residues can be consumed, and the pollution of long-term stacking of a lot of waste residues to the environment is reduced.

Description

technical field

[0001] The invention relates to a preparation method of an inorganic gypsum retarder. The obtained retarder can adjust the setting time of building gypsum and meet the construction requirements of gypsum building material products. Background technique

[0002] Gypsum is a building material with many excellent characteristics, such as good volume stability, light weight, fire prevention, sound insulation, heat preservation, earthquake resistance, radiation protection, etc., can make the surface of hardened body smooth, does not crack when dry, good decoration, and can be processed Good performance, low production energy consumption and other advantages.

[0003] Gypsum is widely used in plastering gypsum, plastering gypsum, gypsum mortar, gypsum blocks, various gypsum wallboards, ceilings, decorative sound-absorbing panels and other decorative parts and other products. In practical application, the setting time of gypsum material is short after mixing with w...

Examples

Embodiment 1

[0019] The specific surface area of ​​slag is 394m 2 / kg; the loss on ignition of fly ash is 8.1%, and its 0.08mm square hole sieve residue is 11%; sodium hydroxide is industrial grade, with an effective content of 99%; the solid content of water glass is 27%, and the modulus is 3.5.

[0020] The ratio of materials by mass is: 60 parts of slag, 70 parts of fly ash, 10 parts of sodium hydroxide, 2 parts of water glass, and water-solid ratio of 0.30; according to the method of the present invention, the slurry is poured into shape, and the test block is at normal temperature. After curing for 28 days, dry, crush, and then grind to make gypsum retarder (its specific surface area is 428m 2 / kg).

Embodiment 2

[0022] The specific surface area of ​​slag is 312m 2 / kg; the loss on ignition of fly ash is 4.3%, and its 0.08mm square hole sieve residue is 14%; sodium hydroxide is industrial grade, with an effective content of 99%; the solid content of water glass is 30%, and the modulus is 2.7.

[0023] According to the mass ratio of materials: 75 parts of slag, 40 parts of fly ash, 7 parts of sodium hydroxide, 4 parts of water glass, water-solid ratio 0.28; according to the method of the present invention, the slurry is poured into shape, and the test block is at normal temperature. After curing for 28 days, dry, crush, and then grind to make gypsum retarder (its specific surface area is 371m 2 / kg).

Embodiment 3

[0025] The specific surface area of ​​slag is 436m 2 / kg; the loss on ignition of fly ash is 9.6%, and its 0.08mm square hole sieve residue is 23%; sodium hydroxide is industrial grade, with an effective content of 99%; the solid content of water glass is 25%, and the modulus is 3.1.

[0026] According to the mass ratio of materials: 90 parts of slag, 50 parts of fly ash, 5 parts of sodium hydroxide, 5 parts of water glass, and water-solid ratio of 0.26; according to the method of the present invention, the slurry is poured into shape, and the test block is at normal temperature. After curing for 28 days, dry, crush, and then grind to make gypsum retarder (its specific surface area is 316m 2 / kg).

technical field

[0001] The invention relates to a preparation method of an inorganic gypsum retarder. The obtained retarder can adjust the setting time of building gypsum and meet the construction requirements of gypsum building material products. Background technique

[0002] Gypsum is a building material with many excellent characteristics, such as good volume stability, light weight, fire prevention, sound insulation, heat preservation, earthquake resistance, radiation protection, etc., can make the surface of hardened body smooth, does not crack when dry, good decoration, and can be processed Good performance, low production energy consumption and other advantages.

[0003] Gypsum is widely used in plastering gypsum, plastering gypsum, gypsum mortar, gypsum blocks, various gypsum wallboards, ceilings, decorative sound-absorbing panels and other decorative parts and other products. In practical application, the setting time of gypsum material is short after mixing with w...

Examples

Embodiment 1

[0019] The specific surface area of ​​slag is 394m 2 / kg; the loss on ignition of fly ash is 8.1%, and its 0.08mm square hole sieve residue is 11%; sodium hydroxide is industrial grade, with an effective content of 99%; the solid content of water glass is 27%, and the modulus is 3.5.

[0020] The ratio of materials by mass is: 60 parts of slag, 70 parts of fly ash, 10 parts of sodium hydroxide, 2 parts of water glass, and water-solid ratio of 0.30; according to the method of the present invention, the slurry is poured into shape, and the test block is at normal temperature. After curing for 28 days, dry, crush, and then grind to make gypsum retarder (its specific surface area is 428m 2 / kg).

Embodiment 2

[0022] The specific surface area of ​​slag is 312m 2 / kg; the loss on ignition of fly ash is 4.3%, and its 0.08mm square hole sieve residue is 14%; sodium hydroxide is industrial grade, with an effective content of 99%; the solid content of water glass is 30%, and the modulus is 2.7.

[0023] According to the mass ratio of materials: 75 parts of slag, 40 parts of fly ash, 7 parts of sodium hydroxide, 4 parts of water glass, water-solid ratio 0.28; according to the method of the present invention, the slurry is poured into shape, and the test block is at normal temperature. After curing for 28 days, dry, crush, and then grind to make gypsum retarder (its specific surface area is 371m 2 / kg).

Embodiment 3

[0025] The specific surface area of ​​slag is 436m 2 / kg; the loss on ignition of fly ash is 9.6%, and its 0.08mm square hole sieve residue is 23%; sodium hydroxide is industrial grade, with an effective content of 99%; the solid content of water glass is 25%, and the modulus is 3.1.

[0026] According to the mass ratio of materials: 90 parts of slag, 50 parts of fly ash, 5 parts of sodium hydroxide, 5 parts of water glass, and water-solid ratio of 0.26; according to the method of the present invention, the slurry is poured into shape, and the test block is at normal temperature. After curing for 28 days, dry, crush, and then grind to make gypsum retarder (its specific surface area is 316m 2 / kg).

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