A kind of method for preparing gypsum-based self-leveling material from glauberite tailings

A glauberite and gypsum-based technology, which is applied in the field of glauberite tailings for preparing gypsum-based self-leveling materials, can solve the problems of high production cost, hindered popularization and application, slow development and the like, and achieves the effects of low price and easy popularization and application.

Active Publication Date: 2020-11-03
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the production cost is higher than that of cement-based self-leveling mortar, the popularization and application are hindered and the development is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 1.5g of sodium citrate, aluminum sulfate and sodium dodecylbenzenesulfonate according to the mass ratio of 1:1.5:2, stir them evenly in 450mL of water, and put them into the autoclave together with 450g of glauberite tailings below 50 mesh Add 1.5mL of dilute sulfuric acid dropwise, react at 120°C for 1.5h, take out the solution in the autoclave and quickly filter it with 1L of boiling water and 500mL of absolute ethanol in a vacuum filter, and put it in a 120°C electric blast Dry in a drying oven to obtain a gypsum-based self-leveling material.

[0023] The water requirement of this self-leveling material is 25%, the initial setting time is 70min, the absolute dry compressive strength is 30MPa, the absolute dry flexural strength is 10MPa, and the shrinkage rate is 0.02%. (JC / T1023-2007 "Gypsum-based self-leveling mortar" requires initial setting time ≥ 1h, absolute dry compressive strength ≥ 20MPa, absolute dry flexural strength ≥ 7.5MPa, shrinkage rate ≤ 0.05%)....

Embodiment 2

[0026] Weigh 2.0g of potassium citrate, aluminum sulfate, and sodium dodecylbenzenesulfonate according to the mass ratio of 1:1:2, stir them evenly in 500mL of water, and put them into the autoclave together with 450g of glauberite tailings below 50 mesh Add 1.5mL of dilute sulfuric acid dropwise, react at 120°C for 1.5h, take out the solution in the autoclave and quickly filter it with 1L of boiling water and 500mL of absolute ethanol in a vacuum filter, and put it in a 120°C electric blast Dry in a drying oven to obtain a gypsum-based self-leveling material. The water requirement of this self-leveling material is 23%, the initial setting time is 75min, the absolute dry compressive strength is 29MPa, the absolute dry flexural strength is 9.5MPa, and the shrinkage rate is 0.02%. in the requirements.

[0027] In this embodiment, the total amount of potassium citrate, aluminum sulfate, and sodium dodecylbenzenesulfonate can be 2g or 2.25g or 2.1g.

Embodiment 3

[0029] Weigh 1.5g of sodium citrate, aluminum chloride and sodium dodecylbenzenesulfonate according to the mass ratio of 1:1.5:2, stir them evenly in 450mL of water, and put them into the high pressure together with 450g of glauberite tailings below 50 mesh Add 1.5mL of dilute sulfuric acid dropwise into the kettle, react at 115°C for 2 hours, take out the solution in the autoclave and quickly filter it with 1L of boiling water and 500mL of absolute ethanol in a vacuum filter, and put it into a 120°C electric heating blast Dry in a drying oven to obtain a gypsum-based self-leveling material. The water demand of the self-leveling material is 27%, the initial setting time is 80min, the absolute dry compressive strength is 32MPa, the absolute dry flexural strength is 11MPa, and the shrinkage rate is 0.02%. requirements.

[0030] In this embodiment, the amount of sodium citrate, aluminum chloride, and sodium dodecylbenzenesulfonate can be 1.5 g, 1.75 g, or 3 g, etc.

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Abstract

The invention provides a method for preparing a gypsum-based self-leveling material from glauberite. The gypsum-based self-leveling material is produced from the glauberite with a pressurized aqueoussolution method. Few additives are used, the raw materials are widely sourced, and the cost is low. The method is implemented as follows: 450-600 parts of the glauberite are put in an autoclave, 0.75-1.5 parts of a crystal modifier and 0.64-1.5 parts of a surfactant are evenly mixed with water, a mixture is poured into the autoclave, pH is regulated to 6-8 by a pH regulating agent, the autoclave is tightly closed, a reaction is conducted at 115-130 DEG C for 1-2 h, a solution is taken out, boiling water and absolute ethanol are used for filtering, dehydrating and reagent removal in a vacuum filter, and drying is performed in a drying oven. The gypsum-based self-leveling material prepared from the glauberite has the advantages that the performance exceeds standard requirements in the national building material industry, cheap mirabilite gypsum is used, and accordingly, popularization and application are better facilitated.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of tailings, in particular to a method for preparing a gypsum-based self-leveling material from glauberite tailings. Background technique [0002] Industrial by-product gypsum refers to the by-product or waste residue with calcium sulfate as the main component produced by chemical reactions in industrial production, mainly including desulfurization gypsum, phosphogypsum, titanium gypsum, mirabilite gypsum, salt gypsum, citrate gypsum, etc. my country's industrial by-product gypsum discharge is huge, but the comprehensive utilization rate is low. In 2013, the total discharge of industrial by-product gypsum was about 180 million tons, and the comprehensive utilization of industrial by-product gypsum was about 86.6 million tons, with a comprehensive utilization rate of about 48%. The stacking of industrial by-product gypsum not only occupies a large amount of land, but also causes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
CPCC04B28/145C04B2201/50C04B24/20C04B14/06C04B14/28C04B14/045C04B14/20C04B18/12
Inventor 谭琦赵毅刘玉林李一波
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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