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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

Active Publication Date: 2021-08-10
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention avoids the occurrence of highly corrosive raw material hydrofluoric acid in the process of preparing aluminum fluoride by conventional methods, and solves the problems of harsh equipment requirements and danger in the current process of preparing aluminum fluoride with hydrofluoric acid and aluminum hydroxide ; On the other hand, by controlling the reaction conditions, the reaction product aluminum fluoride mother liquor is mainly soluble AlF 3 , and due to the SiO generated in the reaction 2 The specific surface area of ​​the particles is large, which can thicken the solution and increase the stability.

Method used

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  • A kind of preparation method of alkali-free liquid accelerator
  • A kind of preparation method of alkali-free liquid accelerator
  • A kind of preparation method of alkali-free liquid accelerator

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preparation example Construction

[0035] The "preparation method of a non-alkali liquid quick-setting agent" of the present invention comprises: respectively weighing the set parts according to the mass percentage: aluminum sulfate, phosphate fertilizer production waste liquid, aluminum hydroxide, sodium silicate and water, and preparing 2 Granular aluminum fluoride liquid, prepared evenly dispersed with SiO 2 Granular aluminum fluoride mother liquor, mixing the mother liquor with sodium silicate and aluminum sulfate and stirring evenly to obtain an alkali-free liquid quick-setting agent; the fluosilicic acid comes from the by-product of phosphate fertilizer production, and the reaction formula involved in the preparation of the aluminum fluoride mother liquor as follows:

[0036] h 2 SiF 6 +2Al(OH) 3 →2AlF 3 +SiO2 2 +4H 2 o

Embodiment 1

[0039] S1: Weigh respectively according to mass percentage: 35% of aluminum sulfate, 33% of phosphate fertilizer production waste liquid containing fluorosilicic acid, 16% of aluminum hydroxide, 2% of sodium silicate, 32% of water, and set aside.

[0040] S2: filter the phosphate fertilizer production waste liquid prepared by step S1, concentrate the filtrate, and control the solution H by titration + The concentration is 5.2~5.3mol / L, then add aluminum hydroxide and stir to obtain SiO 2 Granular aluminum fluoride solution.

[0041] S3: adopt homogeneous disperser, to step S2 made containing SiO 2 The aluminum fluoride solution of the particles is homogenized to make a uniform dispersion of SiO 2 Microparticle aluminum fluoride mother liquor.

[0042] S4: Mix the aluminum fluoride mother liquor prepared according to step S3, the aluminum sulfate and sodium silicate weighed according to step S1, and stir until uniform to obtain an alkali-free liquid quick-setting agent.

[...

Embodiment 2

[0045] S1: Weigh respectively according to mass percentage: 37% of aluminum sulfate, 25% of phosphate fertilizer production waste liquid containing fluorosilicic acid, 13% of aluminum hydroxide, 2.5% of sodium silicate, and 35.5% of water.

[0046] S2: filter the phosphate fertilizer production waste liquid prepared by step S1, concentrate the filtrate, and control the solution H by titration + The concentration is 5.2~5.3mol / L, then add aluminum hydroxide and stir to obtain SiO 2 Granular aluminum fluoride solution.

[0047] S3: adopt homogeneous disperser, to step S2 made containing SiO 2 The aluminum fluoride solution of the particles is homogenized to make a uniform dispersion of SiO 2 Microparticle aluminum fluoride mother liquor.

[0048] S4: Mix the aluminum fluoride mother liquor prepared according to step S3, the aluminum sulfate and sodium silicate weighed according to step S1, and stir until uniform to obtain an alkali-free liquid quick-setting agent.

[0049] I...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14C04B103/22
CPCC04B40/0046C04B2103/22C04B14/06C04B22/126C04B22/148C04B12/04
Inventor 孙义明王福瑶
Owner HUBEI UNIV OF TECH
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