Mirabilite gypsum capable of being used as cement retarder

Abstract

The invention discloses mirabilite gypsum capable of being used as a cement retarder. The mirabilite gypsum is prepared from the following chemical ingredients in percentage by weight: 5 to 18 percentof SiO2, 1.4 to 5.2 percent of Al2O3, 0.5 to 3.0 percent of Fe2O3, 15 to 35 percent of CaO, 0.5 to 3.5 percent of MgO, 0.2 to 0.35 percent of P2O5 and 25 to 43 percent of SO3, wherein the attached water content is less than or equal to 16 percent, the crystal water content is higher than or equal to 8 percent, and the alkalinity is 0.5 to 1.6 percent. The cement prepared by using the mirabilite gypsum as the cement retarder has qualified stability; the cement intensity is identical to the intensity of cement prepared from natural gypsum and ardealite; the initial setting time and the final setting time are shortened by one hour or above through being compared with that of the ardealite; the natural gypsum and the ardealite can be replaced; the relying degree of the cement production enterprise on the natural gypsum is reduced; in addition, the condensing time is normal; the modification treatment like the ardealite is not needed; the cost is reduced; the economic benefits are improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of glauberite tailings, and in particular relates to a kind of mirabilite gypsum which can be used as a cement retarder. Background technique [0002] Glauber's salt mineral resources widely exist in nature, and the reserves are extremely rich. It is known that more than 30 countries in the world have mineral resources of thenardite. By the end of 1996, China had proven 124 mirabilite mineral deposits, including 62 sites with reserves of 22.112 billion tons and Na 2 SO 4 A total of 62 places have reserves of 10.532 billion tons, and the total resources reach 30 billion tons (Na 2 SO 4 volume), the potential value of resources is 1,776 billion yuan. The provinces (regions) with the most abundant thenardite ore reserves in China are mainly Qinghai, Sichuan, Inner Mongolia, Yunnan, Xinjiang, Hubei and Hunan. [0003] The two main components of glauberite ore are sodium sulfate ...

AI Technical Summary

Problems solved by technology

The patent pointed out that the prepared dihydrate gypsum can be provided to cement production customers, reducing the dependence of cement production enterprises on natural gypsum. However, at present, there is no mature mirabilite gypsum product as a cement retarder. Unstable, resulting in unstable performance of the cement produced when it is used as a cement retarder

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