A kind of preparation method of alkali-free liquid accelerator

A technology of quick-setting agent and liquid, applied in the field of preparation of alkali-free liquid quick-setting agent, can solve the problems of harsh equipment requirements, increase stability, large specific surface area of ​​particles, etc., achieve good early strength, increase stability, shorten the initial and final The effect of setting time
CN110128044BActive Publication Date: 2021-08-10HUBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUBEI UNIV OF TECH
Publication Date
2021-08-10

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Abstract

The invention discloses a preparation method of an alkali-free liquid quick-setting agent, which comprises: weighing 35-40% by mass percentage, 10-15% of fluosilicic acid, 12-16% of aluminum hydroxide, 2-3% of sodium silicate, The rest is water, and then prepared containing SiO 2 Granular aluminum fluoride liquid, prepare aluminum fluoride mother liquid, mix and stir the mother liquid with sodium silicate and aluminum sulfate solution, and obtain alkali-free liquid quick-setting agent. The fluosilicic acid is taken from waste liquid of phosphate fertilizer production, the reaction temperature is ≤25°C, and the mass fraction of aluminum fluoride in the prepared alkali-free liquid quick-setting agent is 7-8%. This method avoids hydrofluoric acid which is a highly corrosive raw material in the preparation process of aluminum fluoride prepared by conventional methods, and solves the problems of harsh equipment requirements and danger in the process of preparing aluminum fluoride with hydrofluoric acid and aluminum hydroxide at the present stage. AlF in the solution obtained from the reaction 3 Mainly soluble AlF 3 , resulting in SiO 2 The specific surface area of ​​the particles is larger, which can thicken the solution and increase the stability of the solution.
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Description

technical field

[0001] The invention relates to a preparation method of an alkali-free liquid quick-setting agent, in particular to a method for preparing a liquid alkali-free sprayed concrete quick-setting agent by using phosphate fertilizer by-products, and belongs to the technical field of concrete additive preparation. Background technique

[0002] Shotcrete is a commonly used consolidation material in the construction industry. Among the technical requirements of this material, setting time and strength are the two most important parameters of shotcrete. Accelerators have an important impact on the setting time of shotcrete. It also has a certain influence on the early strength of concrete. It is an indispensable admixture in the construction of sprayed concrete, and its effect directly affects the quality of concrete.

[0003] Accelerators are mainly divided into powder and liquid accelerators. Powder accelerators have defects such as large working dust, large rebound,...

Claims

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