Method for overcoming feeding difficulty of mirabilite gypsum as cement retarder

Abstract

The invention discloses a method for overcoming feeding difficulty of mirabilite gypsum as a cement retarder and aims to solve the problem that mirabilite gypsum cannot be smoothly added in cement production due to the powdery form. The method comprises steps as follows: (1), reduction of water content; (2), screening; (3), pressing into pellets and aging. The water content has relatively large influence on adhesion of mirabilite gypsum and the higher water content (20% or higher) can result in low pelletizing ratio or incapacity of pelletizing, therefore, the water content of mirabilite gypsum meets the requirement of the pelletizing technology by reduction of the water content and screening, and the production cost is reduced.

Description

technical field

[0001] The invention belongs to the technical field of cement production, and particularly relates to a method for solving the difficulty of feeding mirabilite gypsum as a cement retarder. Background technique

[0002] Meishan City, Sichuan Province, for the production of Glauber's salt, that is, industrial anhydrous sodium sulfate Na 2 SO 4 The mining area discharges about 2 million tons of glauberite slag, a by-product of tunneling, every year. Glauber's salt slag is piled up in the ground dump, and the slag is repeatedly washed and leached by water pump to obtain mirabilite. The mirabilite water after leaching the mirabilite is transported to the underground dissolution area by water pump to produce mirabilite. turned into powder. The reaction formula of glauberite slag is Na 2 SO 4 ·CaSO 4 +H 2 O→Na 2 SO 4 +CaSO 4 ·2H 2 O, that is, after the glauberite slag is leached with water, Na precipitates out 2 SO 4 , while the dihydrate gypsum CaSO wa...

Examples

Embodiment 1

[0024] A method for solving the difficulty of feeding mirabilite gypsum as a cement retarder, comprising the following steps:

[0025] (1) Reduce the water content: The thenardite gypsum is transported to the gypsum storehouse, and stacked by a stacker, and is naturally stacked for 35 days at room temperature to reduce the water content by 6%;

[0026] (2) sieving: the mirabilite gypsum is sent to the belt according to the principle of first-in, first-out, and the thenardite gypsum is transported to the screening equipment through the belt, and the particle size of the thenardite gypsum is below 10 mm and 10 mm. The above are screened out respectively; the glauberite gypsum with a particle size of more than 10mm is directly transported to the aging warehouse by the belt, and aged for 2 days;

[0027] (3) briquetting: the mirabilite gypsum screened in step (2) with a particle size of less than 10 mm is sent to a high-pressure pelletizing machine through a belt for briquetting t...

Embodiment 2

[0031] A method for solving the difficulty of feeding mirabilite gypsum as a cement retarder, comprising the following steps:

[0032] (1) Reduce the water content: The thenardite gypsum is transported to the gypsum storehouse, and stacked by a stacker, and is naturally stacked for 25 days at normal temperature to reduce the water content by 4%;

[0033] (2) sieving: the mirabilite gypsum is sent to the belt according to the principle of first-in, first-out, and the thenardite gypsum is transported to the screening equipment through the belt, and the particle size of the thenardite gypsum is below 10 mm and 10 mm. The above are screened out respectively; the glauberite gypsum with a particle size of more than 10mm is directly transported to the aging warehouse by the belt, and aged for 3 days;

[0034] (3) briquetting: the mirabilite gypsum screened in step (2) with a particle size of less than 10 mm is sent to a high-pressure pelletizing machine through a belt for briquetting...

Embodiment 3

[0038] A method for solving the difficulty of feeding mirabilite gypsum as a cement retarder, comprising the following steps:

[0039] (1) Reduce the water content: The thenardite gypsum is transported to the gypsum storehouse, and stacked by a stacker, and is naturally stacked for 12 days at normal temperature to reduce the water content by 2.5%;

[0040] (2) sieving: the mirabilite gypsum is sent to the belt according to the principle of first-in, first-out, and the thenardite gypsum is transported to the screening equipment through the belt, and the particle size of the thenardite gypsum is below 10 mm and 10 mm. The above are screened out respectively; the glauberite gypsum with a particle size of more than 10mm is directly transported to the aging warehouse by the belt, and aged for 4 days;

[0041](3) briquetting: the mirabilite gypsum screened in step (2) with a particle size of less than 10 mm is sent to a high-pressure pelletizing machine through a belt for briquettin...

technical field

[0001] The invention belongs to the technical field of cement production, and particularly relates to a method for solving the difficulty of feeding mirabilite gypsum as a cement retarder. Background technique

[0002] Meishan City, Sichuan Province, for the production of Glauber's salt, that is, industrial anhydrous sodium sulfate Na 2 SO 4 The mining area discharges about 2 million tons of glauberite slag, a by-product of tunneling, every year. Glauber's salt slag is piled up in the ground dump, and the slag is repeatedly washed and leached by water pump to obtain mirabilite. The mirabilite water after leaching the mirabilite is transported to the underground dissolution area by water pump to produce mirabilite. turned into powder. The reaction formula of glauberite slag is Na 2 SO 4 ·CaSO 4 +H 2 O→Na 2 SO 4 +CaSO 4 ·2H 2 O, that is, after the glauberite slag is leached with water, Na precipitates out 2 SO 4 , while the dihydrate gypsum CaSO wa...

Examples

Embodiment 1

[0024] A method for solving the difficulty of feeding mirabilite gypsum as a cement retarder, comprising the following steps:

[0025] (1) Reduce the water content: The thenardite gypsum is transported to the gypsum storehouse, and stacked by a stacker, and is naturally stacked for 35 days at room temperature to reduce the water content by 6%;

[0026] (2) sieving: the mirabilite gypsum is sent to the belt according to the principle of first-in, first-out, and the thenardite gypsum is transported to the screening equipment through the belt, and the particle size of the thenardite gypsum is below 10 mm and 10 mm. The above are screened out respectively; the glauberite gypsum with a particle size of more than 10mm is directly transported to the aging warehouse by the belt, and aged for 2 days;

[0027] (3) briquetting: the mirabilite gypsum screened in step (2) with a particle size of less than 10 mm is sent to a high-pressure pelletizing machine through a belt for briquetting t...

Embodiment 2

[0031] A method for solving the difficulty of feeding mirabilite gypsum as a cement retarder, comprising the following steps:

[0032] (1) Reduce the water content: The thenardite gypsum is transported to the gypsum storehouse, and stacked by a stacker, and is naturally stacked for 25 days at normal temperature to reduce the water content by 4%;

[0033] (2) sieving: the mirabilite gypsum is sent to the belt according to the principle of first-in, first-out, and the thenardite gypsum is transported to the screening equipment through the belt, and the particle size of the thenardite gypsum is below 10 mm and 10 mm. The above are screened out respectively; the glauberite gypsum with a particle size of more than 10mm is directly transported to the aging warehouse by the belt, and aged for 3 days;

[0034] (3) briquetting: the mirabilite gypsum screened in step (2) with a particle size of less than 10 mm is sent to a high-pressure pelletizing machine through a belt for briquetting...

Embodiment 3

[0038] A method for solving the difficulty of feeding mirabilite gypsum as a cement retarder, comprising the following steps:

[0039] (1) Reduce the water content: The thenardite gypsum is transported to the gypsum storehouse, and stacked by a stacker, and is naturally stacked for 12 days at normal temperature to reduce the water content by 2.5%;

[0040] (2) sieving: the mirabilite gypsum is sent to the belt according to the principle of first-in, first-out, and the thenardite gypsum is transported to the screening equipment through the belt, and the particle size of the thenardite gypsum is below 10 mm and 10 mm. The above are screened out respectively; the glauberite gypsum with a particle size of more than 10mm is directly transported to the aging warehouse by the belt, and aged for 4 days;

[0041](3) briquetting: the mirabilite gypsum screened in step (2) with a particle size of less than 10 mm is sent to a high-pressure pelletizing machine through a belt for briquettin...

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