Alkali-free liquid setting accelerator preparation method

A technology of quick-setting agent and liquid, which is applied in the field of preparation of non-alkali liquid quick-setting agent, which can solve the problems of large specific surface area of ​​particles, increase stability, and strict equipment requirements, and achieve the effect of shortening the initial and final setting time

Active Publication Date: 2019-08-16
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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preparation example Construction

[0035] The "preparation method of an alkali-free liquid quick-setting agent" of the present invention includes: weighing set amounts according to mass percentages: aluminum sulfate, phosphate fertilizer production waste liquid, aluminum hydroxide, sodium silicate and water, and preparing SiO 2 Particles of aluminum fluoride liquid, prepared uniformly dispersed with SiO 2 The aluminum fluoride mother liquor of particles, the mother liquor and the sodium silicate and aluminum sulfate solution are mixed and stirred uniformly to prepare an alkali-free liquid quick-setting agent; the fluorosilicic acid comes from the by-product of phosphate fertilizer production, and the reaction involved in preparing the aluminum fluoride mother liquor The formula is as follows:

[0036] H 2 SiF 6 +2Al(OH) 3 →2AlF 3 +SiO 2 +4H 2 O

Embodiment 1

[0039] S1: Weigh separately by mass percentage: aluminum sulfate 35%, fluorinated silicic acid-containing phosphate fertilizer production waste liquid 33%, aluminum hydroxide 16%, sodium silicate 2%, water 32%, spare.

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

[0041] S3: Using a homogenous disperser, the SiO 2 The granular aluminum fluoride liquid is homogenized to make uniformly dispersed SiO 2 A mother liquor of particulate aluminum fluoride.

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

[0043] In each step of Example 1, the reaction temperature should be controlled ≤ 25°C, the mass of fluorosilici...

Embodiment 2

[0045] S1: Weighed by mass percentages: 37% aluminum sulfate, 25% fluorinated silicic acid-containing phosphate fertilizer production waste liquid, 13% aluminum hydroxide, 2.5% sodium silicate, and 35.5% water.

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

[0047] S3: Using a homogenous disperser, the SiO 2 The granular aluminum fluoride liquid is homogenized to make uniformly dispersed SiO 2 A mother liquor of particulate aluminum fluoride.

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

[0049] In each step of the second embodiment, the reaction temperature should be controlled ≤ 25°C, the mass of fluoros...

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Abstract

The invention discloses an alkali-free liquid setting accelerator preparation method, which comprises: weighing 35-40% by mass of aluminum sulfate, 10-15% by mass of fluorosilicic acid, 12-16% by massof aluminum hydroxide, 2-3% by mass of sodium silicate, and the balance of water; preparing an aluminum fluoride liquid containing SiO2 particles, and preparing an aluminum fluoride mother liquor; and uniformly mixing and stirring the mother liquor, a sodium silicate solution and an aluminum sulfate solution to prepare the alkali-free liquid setting accelerator, wherein the fluorosilicic acid istaken from a phosphorus fertilizer production waste liquid, the reaction temperature is less than or equal to 25 DEG C, and the mass fraction of the aluminum fluoride in the prepared alkali-free liquid setting accelerator is 7-8%. In the prior art, the strong corrosion raw material hydrofluoric acid is used in the aluminum fluoride preparation process using the conventional method, the existing process for preparing aluminum fluoride from hydrofluoric acid and aluminum hydroxide has harsh requirements on equipment and has risk, and other problems exist. With the method of the present invention, the problems in the prior art can be avoided; and the AlF3 in the solution obtained by the reaction is mainly soluble AlF3, and the generated SiO2 particles have a large specific surface area so asto thicken the solution, such that the stability of the solution is increased.

Description

Technical field [0001] The invention relates to a preparation method of an alkali-free liquid quick-setting admixture, in particular to a method for preparing a liquid alkali-free sprayed concrete quick-setting admixture 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 the material, setting time and strength are the two most important parameters of sprayed concrete. Accelerators have an important influence on the setting time of sprayed concrete. It also has a certain impact on the early strength of concrete. It is an indispensable admixture for sprayed concrete in construction. Its effect directly affects the quality of concrete. [0003] Accelerators are mainly divided into powder and liquid accelerating agents. The powder accelerating agent has the defects of large workin...

Claims

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Application Information

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Patent Type & Authority Applications(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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