A method for solving the difficulty in feeding mirabilite gypsum as a cement retarder

A technology of cement retarder and gypsum, applied in the field of cement production, can solve the problems of excessive powdery materials, difficulty in feeding mirabilite gypsum, affecting the production and use of mirabilite gypsum, etc., and achieve the effect of avoiding the increase of economic cost

Active Publication Date: 2021-03-30
SICHUAN TONGQING NANFENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to: aim at the characteristics of excess powdery materials in the form of Glauber’s salt gypsum, which makes feeding of Glauber’s salt gypsum difficult and affects the large-scale production and use of Glauber’s salt gypsum. The present invention provides a solution for the use of Glauber’s salt gypsum Difficult way to feed cement retarder

Method used

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  • A method for solving the difficulty in feeding mirabilite gypsum as a cement retarder
  • A method for solving the difficulty in feeding mirabilite gypsum as a cement retarder

Examples

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Embodiment 1

[0024] A kind of method that solves that thenardite gypsum is used as cement retarder feeds difficulty, comprises the following steps:

[0025] (1) Reduce the water content: transport the Glauber's salt gypsum to the gypsum warehouse, and stack it through a stacker, and naturally stack it at room temperature for 35 days to reduce the water content by 6%;

[0026] (2) Screening: Send the thenardite gypsum to the belt according to the principle of first-in-first-out after being stacked, and transport the thenardite gypsum to the screening equipment through the belt, and the particle size of the thenardite gypsum will be below 10mm and 10mm The above are screened out separately; the particle size of Glauber's salt gypsum is more than 10mm is directly transported to the aging warehouse by the belt, and aged for 2 days;

[0027] (3) Ball briquetting: the thenardite gypsum sieved in step (2) with a particle size of less than 10mm is sent to a high-pressure ball forming machine throu...

Embodiment 2

[0031] A kind of method that solves that thenardite gypsum is used as cement retarder feeds difficulty, comprises the following steps:

[0032] (1) Reduce the water content: transport the Glauber's salt gypsum to the gypsum warehouse, and stack it through a stacker, and naturally stack it at room temperature for 25 days to reduce the water content by 4%;

[0033] (2) Screening: Send the thenardite gypsum to the belt according to the principle of first-in-first-out after being stacked, and transport the thenardite gypsum to the screening equipment through the belt, and the particle size of the thenardite gypsum will be below 10mm and 10mm The above are screened out separately; the particle size of Glauber's salt 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) Ball briquetting: the thenardite gypsum sieved in step (2) with a particle size of less than 10mm is sent to a high-pressure ball ...

Embodiment 3

[0038] A kind of method that solves that thenardite gypsum is used as cement retarder feeds difficulty, comprises the following steps:

[0039] (1) Reduce the water content: Transport the Glauber's salt gypsum to the gypsum warehouse, and stack it through a stacker, and naturally stack it at room temperature for 12 days to reduce the water content by 2.5%;

[0040] (2) Screening: Send the thenardite gypsum to the belt according to the principle of first-in-first-out after being stacked, and transport the thenardite gypsum to the screening equipment through the belt, and the particle size of the thenardite gypsum will be below 10mm and 10mm The above are screened out separately; the particle size of Glauber's salt gypsum with a particle size above 10mm is directly transported to the aging warehouse by the belt, and aged for 4 days;

[0041](3) Ball briquetting: the thenardite gypsum sieved in step (2) with a particle size of less than 10mm is sent to a high-pressure ball formin...

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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 in particular relates to a method for solving the difficulty in feeding mirabilite gypsum as a cement retarder. Background technique [0002] Meishan City, Sichuan Province is 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 excavation by-product glauberite slag every year. The glauberite slag is piled up on the ground dump, and the slag is repeatedly washed to extract the thenardite by water pumping, and the thenardite water after leaching the thenardite is transported to the underground melting area by the water pump to produce saltwater. turned into a 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 is precipitated 2 SO 4 , and dihydrate gypsum CaSO was precipit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14C04B103/22
CPCC04B22/147C04B2103/22
Inventor 彭诗谷
Owner SICHUAN TONGQING NANFENG
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