阅读说明：本技术 一种基于硬石膏和脱硫β粉的高强石膏胶凝材料及其制备方法 (High-strength gypsum cementing material based on anhydrite and desulfurized beta powder and preparation method thereof ) 是由 陈靓 陈甜甜 汤进 唐永波 万建东 于 2020-08-13 设计创作，主要内容包括：本发明公开了一种基于硬石膏和脱硫β粉的高强石膏胶凝材料及其制备方法,包括原料组分以及原料组分的重量份如下：高强石膏60～70份、硬石膏5～35份、脱硫β粉5～35份；本发明通过掺入成本较低的硬石膏、脱硫β粉,未通过其他加热、加压附加高成本技术,从而能得到性能较佳的粉料,本发明制备的高强石膏胶凝材料力学性能满足2h抗折强度≥5.0MPa,烘干抗压强度≥40.0MPa的条件,很大程度上缓解了天然硬石膏、工业副产磷石膏的堆存情况,充分实现资源的持续利用。(The invention discloses a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder and a preparation method thereof, wherein the high-strength gypsum cementing material comprises the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-35 parts of anhydrite and 5-35 parts of desulfurized beta powder; according to the invention, the anhydrite and the desulfurized beta powder with lower cost are doped, and other heating and pressurizing additional high-cost technologies are not used, so that powder with better performance can be obtained, the mechanical property of the high-strength gypsum cementing material prepared by the invention meets the conditions that the rupture strength is more than or equal to 5.0MPa after 2h and the drying compressive strength is more than or equal to 40.0MPa, the stockpiling condition of natural anhydrite and industrial phosphogypsum is relieved to a great extent, and the continuous utilization of resources is fully realized.)

1. The high-strength gypsum cementing material based on anhydrite and desulfurized beta powder is characterized by comprising the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-35 parts of anhydrite and 5-35 parts of desulfurized beta powder.

2. The anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to claim 1, characterized by comprising the following raw material components in parts by weight: 70 parts of high-strength gypsum, 10 parts of anhydrite and 20 parts of desulfurized beta powder.

3. The anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to claim 1, characterized by comprising the following raw material components in parts by weight: 70 parts of high-strength gypsum, 15 parts of anhydrite and 15 parts of desulfurized beta powder.

4. The anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to claim 1, characterized in that the high-strength gypsum is alpha-type high-strength gypsum, and meets the requirements that the flexural strength is more than or equal to 6.0MPa within 2 hours and the drying compressive strength is more than or equal to 50.0 MPa.

5. The anhydrite and desulfurized beta meal-based high-strength gypsum cementitious material according to claim 1, characterized in that the anhydrite is natural anhydrite or commercially available anhydrite.

6. A preparation method of a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder is characterized by comprising the following steps:

s1, selecting high-strength gypsum: selecting high-strength gypsum powder, and meeting the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa;

s2, grinding anhydrite: carrying out ball milling on the anhydrite by adopting a planetary ball mill to ensure that the specific surface area is 1170-7000 cm²/g；

S3, mixing materials: and (3) uniformly mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the desulfurization beta powder to obtain the high-strength gypsum cementing material based on the anhydrite and the desulfurization beta powder.

7. The method for preparing the anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to the claim 6, wherein the high-strength gypsum powder in the step S1 is alpha type high-strength gypsum powder.

8. The method for preparing the anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to the claim 6, wherein in the step S2, the grinding time of the anhydrite is 0.1-2 h.

Technical Field

The invention relates to a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder and a preparation method thereof.

Background

The alpha high-strength gypsum is obtained by steaming and pressing natural dihydrate gypsum under the condition of saturated steam with certain pressure, the water requirement of the standard consistency is generally between 20 and 35 percent, and the alpha high-strength gypsum has the advantages of high hardness, high strength, good wear resistance and the like, and is widely applied to the industries of aviation, medical treatment, high-end manufacturing and the like. The alpha high-strength gypsum needs less water for hardening, releases low heat in the hydration process, has strength far higher than that of beta building gypsum, but has limited yield and higher price because the process is more complex, the yield is far less than that of the building gypsum and the production cost is higher. The existing specialization is mainly directed at the introduction of high-strength gypsum on a certain aspect, materials such as cement, slag and the like are introduced into the high-strength gypsum, a certain amount of additives are added to adjust the workability, and the performance of the product is improved by utilizing the gelling activity of the materials. Because the introduced components are too complex, when slag, fly ash and other substances are introduced, the whiteness of the product is easily reduced greatly, and when more high-strength gypsum is replaced, the strength is obviously reduced. The strength in the early stage of hydration is mainly derived from the hydration of high-strength gypsum, and appropriate substances such as slag and the like can only play a role of dilution, so that the early strength is low, in the later stage of hydration, active substances such as slag and the like can continuously react to improve the performance of a system, but Al released by the reaction of the active substances, an exciting agent and the gypsum can generate ettringite, and if the proportion is not proper, a large amount of ettringite can cause the system to expand, so that the problems of cracking, pulverization and the like are caused.

Disclosure of Invention

Aiming at the defects of the prior art, the invention solves the problems that: the invention provides a high-strength gypsum cementing material which can obtain higher strength in a short age when more than forty percent of high-strength gypsum is substituted, and has no problem of volume stability, thereby solving the problems that the early strength is poor and the system stability is possibly generated in the later period when more high-strength gypsum is substituted by the existing modified high-strength gypsum powder, and reducing the use cost.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder comprises the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-35 parts of anhydrite and 5-35 parts of desulfurized beta powder.

Further, the feed comprises the following raw material components in parts by weight: 70 parts of high-strength gypsum, 10 parts of anhydrite and 20 parts of desulfurized beta powder.

Further, the feed comprises the following raw material components in parts by weight: 70 parts of high-strength gypsum, 15 parts of anhydrite and 15 parts of desulfurized beta powder.

Furthermore, the high-strength gypsum is alpha-type high-strength gypsum, and the breaking strength of 2 hours is more than or equal to 6.0Mpa, and the drying compressive strength is more than or equal to 50.0 Mpa.

Further, the anhydrite is natural anhydrite or commercially available anhydrite.

A preparation method of a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder comprises the following steps:

s1, selecting high-strength gypsum: selecting high-strength gypsum powder, and meeting the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa;

s2, grinding anhydrite: carrying out ball milling on the anhydrite by adopting a planetary ball mill to ensure that the specific surface area is 1170-7000 cm²/g；

S3, mixing materials: and (3) uniformly mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the desulfurization beta powder to obtain the high-strength gypsum cementing material based on the anhydrite and the desulfurization beta powder.

Further, the high-strength gypsum powder in the step S1 is an α -type high-strength gypsum powder.

Further, in the step S2, the time for grinding the anhydrite is 0.1 to 2 hours.

The invention has the advantages of

The high-strength gypsum cementing material prepared by the invention has mechanical properties meeting the conditions that the rupture strength is more than or equal to 5.0MPa for 2h and the drying compressive strength is more than or equal to 40.0MPa, relieves the stockpiling condition of natural anhydrite and industrial byproduct phosphogypsum to a great extent, and fully realizes the continuous utilization of resources.

Detailed Description

The present invention will be described in further detail below.