Neutral modifying agent for fluorgypsum and method for utilizing neutral modifying agent to modify fluorgypsum

A technology of fluorine gypsum and modifier, which is applied in the field of solid waste recycling, and achieves the effects of reasonable composition of raw materials, cost reduction, and improvement of recycling rate.

Active Publication Date: 2012-08-15
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]The above-mentioned traditional method has the problems of large dosage of neutralizing agent, difficult adjustment of pH value, unstable purity of modified fluorogypsum, and failure to meet the requirements of high-strength glue. Coagulation material application needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0043] i. Preparation of modified fluorogypsum

[0044] Step 1: Take 50% quicklime, 40% steel slag, and 10% fly ash according to the weight percentage of the following example; grind the quicklime to a specific surface area of ​​225m 2 / kg, steel slag is ground to a specific surface area of ​​460m 2 / kg, the fly ash is ground to a specific surface area of ​​339m 2 / kg; Dry to remove surface water respectively; After drying, put it into a mixer and stir evenly to obtain a neutral modifier;

[0045] Step 2: Fluorogypsum by weight ratio: Neutralizing modifier = 1:0.01 Weigh the fluorogypsum and neutral modifier, stir to make them fully mixed evenly, and stand still for 12 hours to prepare modified fluorogypsum.

[0046] 2. Comparative experiment: Take the modified fluorogypsum sample and add distilled water according to the water-solid ratio of 1.5:1, and use a precision pH meter to test the pH value of the supernatant, which is accurate to 0.1.

[0047...

experiment example 2

[0051] 1. Preparation of modified fluorogypsum

[0052]Step 1: Take 80% quicklime, 10% steel slag, and 10% fly ash according to the weight percentage of the following example; grind the quicklime to a specific surface area of ​​230m 2 / kg, steel slag is ground to a specific surface area of ​​460m 2 / kg, fly ash is ground to a specific surface area of ​​340m 2 / kg; Dry to remove surface water respectively; After drying, put it into a mixer and stir evenly to obtain a neutral modifier;

[0053] Step 2: Fluorogypsum by weight ratio: Neutralizing modifier = 1:0.03 Weigh the fluorogypsum and neutral modifier, stir to make them fully mixed evenly, and stand still for 12 hours to prepare modified fluorogypsum.

[0054] 2. Comparative experiment: Take the modified fluorogypsum sample and add distilled water according to the water-solid ratio of 1.7:1, and use a precision pH meter to test the pH value of the supernatant, which is accurate to 0.1.

[0055] Take another 50g modified f...

experiment example 3

[0060] 1. Preparation of modified fluorogypsum

[0061] Step 1: Take 50% quicklime, 40% steel slag, and 10% fly ash according to the weight percentage of the following example; grind the quicklime to a specific surface area of ​​219m 2 / kg, steel slag is ground to a specific surface area of ​​465m 2 / kg, fly ash is ground to a specific surface area of ​​325m 2 / kg; Dry to remove surface water respectively; After drying, put it into a mixer and stir evenly to obtain a neutral modifier;

[0062] Step 2: Fluorogypsum by weight ratio: Neutralizing modifier = 1:0.15 Weigh the fluorogypsum and neutral modifier, stir to make them fully mixed evenly, and stand still for 16 hours to prepare modified fluorogypsum.

[0063] 2. Comparative experiment: Take the modified fluorogypsum sample and add distilled water according to the water-solid ratio of 2:1, and use a precision pH meter to test the pH value of the supernatant, which is accurate to 0.1.

[0064] Take another 50g modified fl...

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Abstract

The invention relates to a neutral modifying agent for fluorgypsum. A modifying method comprises the following steps of: uniformly mixing calcined lime, steel slags and coal ash according to a certain mass percent to prepare the neutral modifying agent, and doping a proportion of neutral modifying agent into the fluorgypsum so as to reach alkalescence. The neutral modifying agent has the advantages that the self-prepared neutral modifying agent takes full advantages of wastes, and the modifying cost is reduced. The modified fluorgypsum obtained by the method can be used as chemical gypsum with excellent performance, which is used for preparation of cement retarders or inorganic bond materials.

Description

technical field [0001] The invention relates to the field of solid waste resource treatment, in particular to a fluorogypsum neutral modifier and a method for modifying fluorogypsum using the same. [0002] Background technique: [0003] Since fluorine gypsum contains residual hydrofluoric acid and sulfuric acid and other substances, the pH is between 1.8 and 2.3, and the residual fluorine is also one of the limiting components when used as a raw material for building gypsum. Therefore, fluorogypsum has a more serious impact on the environment than other industrial gypsum residues. If it is not disposed of properly, toxic and harmful substances such as hydrofluoric acid and sulfuric acid in fluorogypsum will enter the environment in various ways. The hydrofluoric acid and sulfuric acid that enter the atmosphere mainly exist in the form of gaseous molecules and acid-containing dust, and spread to the surrounding area with the airflow and water, and finally fall to the groun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
Inventor 周旻黄绪泉侯浩波刘奔
Owner WUHAN UNIV
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