Sulfurgypsum for ceramic mold and preparation method of sulfurgypsum

A ceramic mold and sulfur gypsum technology, which is applied in the field of sulfur gypsum, can solve the problems of high content of impurities in sulfur gypsum waste, and achieve the effect of being suitable for large-scale production, conducive to shaping, and compact in structure

Inactive Publication Date: 2016-04-20
GUIZHOU TENGFENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high content of impurities in sulfur gypsum waste, it is difficult to meet the above requirements

Method used

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  • Sulfurgypsum for ceramic mold and preparation method of sulfurgypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A preparation method of sulfur gypsum for ceramic mould, comprising the steps:

[0057] (1) Flash burning: in a nitrogen atmosphere, the flue gas temperature is heated to 800°C within 1h, and the sulphur gypsum is calcined at this temperature for 1h;

[0058] (2) desulfurization process: adopt the semi-dry FGD technology of desulfurization in a dry state and regenerate the desulfurizer in a wet state to desulfurize the sulfur gypsum obtained in step (1); the desulfurizer used is activated carbon;

[0059] (3) Adding auxiliary materials: adding citric acid accounting for 0.1% of the mass of the sulfur gypsum to the sulfur gypsum obtained in step (2), stirring and mixing evenly, to obtain a sulfur gypsum for ceramic molds.

Embodiment 2

[0061] A preparation method of sulfur gypsum for ceramic mould, comprising the steps:

[0062] (1) Flash burning: in a nitrogen atmosphere, the flue gas temperature is heated to 900 °C within 1 h, and the sulfur gypsum is calcined at this temperature for 5 h;

[0063] (2) desulfurization process: adopt the semi-dry FGD technology of desulfurization in dry state and regenerate desulfurizer in wet state to desulfurize the sulfur gypsum obtained in step (1); the desulfurizer used is ZSM-5 molecular sieve;

[0064] (3) Adding auxiliary materials: adding tartaric acid, which accounts for 2% of the mass of the sulfur gypsum, to the sulfur gypsum obtained in the step (2), stirring and mixing evenly, to obtain a sulfur gypsum used for a ceramic mold.

Embodiment 3

[0066] A preparation method of sulfur gypsum for ceramic mould, comprising the steps:

[0067] (1) Flash burning: in a nitrogen atmosphere, the flue gas temperature is 860 °C at a heating rate of 20 °C / min, and the sulfur gypsum is calcined at this temperature for 3 hours;

[0068] (2) desulfurization process: adopt water washing mode to carry out desulfurization treatment to the obtained sulphur gypsum in step (1), and the amount of water added is 1 times of the quality of sulphur gypsum; the adopted desulfurizing agent is calcium hydroxide;

[0069] (3) Adding auxiliary materials: adding sodium tartrate accounting for 0.5% of the mass of the thiogypsum to the thiogypsum obtained in step (2), stirring and mixing evenly, to obtain a thiogypsum for ceramic molds.

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Abstract

The invention provides sulfurgypsum for a ceramic mold and a preparation method of the sulfurgypsum. Monohydrate gypsum and dihydrate gypsum in sulfurgypsum can react to be converted into dihydrate gypsum through a flash burning process, the generated dihydrate gypsum is in a beta-type crystal morphology, organic impurities are converted into gas through high temperature to be exhausted, and therefore the harm of the organic impurities to the performance of the gypsum is eliminated. Sulphur impurities in the sulfurgypsum can be further removed through a desulfuration process. The obtained sulfurgypsum is modified by adding a retarder, and the sulfurgypsum can be applied to the ceramic mold. The sulfurgypsum prepared through the preparation method of the sulfurgypsum for the ceramic mold is compact in hardening structure, high in strength and good in water absorption performance, and meanwhile has certain corrosion resisting performance and abrasion resisting performance, when the sulfurgypsum is used for preparing the ceramic mold, the sulfurgypsum cannot be blackened, or dried too fast, and moulding is easy. The preparation method of the sulfurgypsum for the ceramic mold is simple in process and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of sulfur gypsum, in particular to a sulfur gypsum used for ceramic molds and a preparation method thereof. Background technique [0002] Grouting is a simple and practical ceramic molding process, usually using gypsum as the molding mold. The production cost of gypsum is low, and its raw material gypsum is abundant in our country, and the price is low; it has good fluidity in production, and can prepare molds of various shapes; in addition, it has unparalleled coagulation performance and water absorption performance, which is still widely used at present. It is widely used in grouting, spinning, rolling, plastic pressing (cold pressing) and other forming processes, and there is no other material that can be completely replaced. [0003] However, in recent years, with the tension of my country's daily-use ceramics industry, the gypsum used as raw materials for making daily-use ceramic molds has become incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B11/26
CPCC04B28/142C04B2103/0068C04B2103/22C04B2111/20C04B2201/50C04B24/06C04B22/10
Inventor 李玮
Owner GUIZHOU TENGFENG TECH CO LTD
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