Fast oxidizing agent for calcium sulfite in desulfurization gypsum and application of fast oxidizing agent

A technology of desulfurized gypsum and calcium sulfite, which is applied in the field of building materials, can solve problems such as inconvenient popularization and use, adverse effects on cement performance, and excessive water introduction, and achieves the effects of simple operation, economical reliability, and broad application prospects

Active Publication Date: 2012-05-23
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has problems such as introducing too much water into the oxidation treatment of desulfurization products and adversely affecting the performance of cement, so it is not easy to be popularized and used in production.

Method used

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  • Fast oxidizing agent for calcium sulfite in desulfurization gypsum and application of fast oxidizing agent
  • Fast oxidizing agent for calcium sulfite in desulfurization gypsum and application of fast oxidizing agent
  • Fast oxidizing agent for calcium sulfite in desulfurization gypsum and application of fast oxidizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. Preparation of rapid oxidant of calcium sulfite in desulfurized gypsum and detection of its desulfurization effect

[0027] Get 3.75 grams (10 parts) of commercially available technical grade potassium permanganate, 0.75 grams (2 parts) of commercially available technical grade acetic acid, 16.5 grams (44 parts) of ferromanganese alloy slag, 16.5 grams (44 parts) of pyrite slag, mix The composite oxidizing agent of this example is prepared uniformly.

[0028]

[0029] Using cement performance comparison test:

[0030] Raw materials: cement clinker; desulfurized gypsum (purchased from coal-fired power plants), calcium sulfite (CaSO 3 0.5H 2 O) content is about 10%; fly ash meets the requirements of GB / T 1596 (level II); slag meets the requirements of GB / T 203.

[0031] Concrete method: take above-mentioned composite oxidant, mix uniformly with desulfurization gypsum according to the addition ratio of 5% of total mass content (composite oxidant 1 part, de...

Embodiment 2～ Embodiment 5

[0036] Example 2-Example 5, preparation of rapid oxidant of calcium sulfite in desulfurization gypsum and detection of desulfurization effect

[0037]According to the sample preparation and detection method in Example 1, the ratio of composite oxidant raw materials was changed (as shown in Examples 2 to 5 in Table 2), and the oxidation effect of calcium sulfite in desulfurized gypsum was compared.

[0038] The results are shown in Table 2. It can be seen that the physical properties of cement after oxidation treatment of desulfurized gypsum are improved, the setting time of cement is shortened, and the early and late strength There are different degrees of improvement; and the ratio of composite oxidant raw materials changes, and the difference in cement performance is not large, which further proves that the oxidant of the present invention has a relatively stable oxidation effect on calcium sulfite.

[0039] Table 2 Variation of oxidant ratio and comparison of desulfurized c...

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Abstract

The invention discloses a fast oxidizing agent for calcium sulfite in desulfurization gypsum and application of the fast oxidizing agent. The fast oxidizing agent comprises the following components in part by weight: 10 to 30 parts of potassium permanganate, 0 to 20 parts of acetic acid, 40 to 80 parts of ferromanganese alloy slag and 0 to 44 parts of iron pyrite slag. A method for fast oxidizing the calcium sulfite in the desulfurization gypsum comprises the following steps of: uniformly mixing the desulfurization gypsum and the fast oxidizing agent according to a proportion of the desulfurization gypsum to the oxidizing agent of 19 to 1; and placing the mixture under the condition of natural air for at least one day to oxidize the calcium sulfite in the desulfurization gypsum by the oxidizing agent. The test shows that the oxidizing agent is stable in performance, can fast oxidize the calcium sulfite in the desulfurization gypsum and has no harmful effect on the performance of cement and concrete. The method for fast oxidizing the calcium sulfite in the desulfurization gypsum is easy to operate, is economic and reliable, is favorable for popularizing and applying the desulfurization gypsum to cement industries, and has a wide application prospect; and complicated production equipment is not needed.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a rapid oxidant for calcium sulfite in desulfurized gypsum and an application thereof. Background technique [0002] Desulfurized gypsum is a good reusable resource. At present, it has been widely used in the field of building materials such as building gypsum and gypsum board in my country, showing excellent performance. However, due to the calcium sulfite (CaSO 3 0.5H 2 O) and other component fluctuations, the current application ratio of desulfurized gypsum as a retarder in the cement industry is not high. [0003] Calcium sulfite has thermal stability and can be oxidized into calcium sulfate dihydrate under certain conditions. For the oxidation of calcium sulfite in gypsum, the research at home and abroad has mainly focused on the desulfurization process (under the liquid phase system under homogeneous or multiphase conditions) for many years. Studies have sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
Inventor 王昕
Owner CHINA BUILDING MATERIALS ACAD
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