Phosphorus slag super-sulfate cement and preparation method thereof

Abstract

The invention discloses super-sulfate cement and a preparation method thereof, in particular to phosphorus slag super-sulfate cement and a preparation method thereof. The phosphorus slag super-sulfate cement comprises the following components by weight portions: 30-50 portions of electric furnace phosphorus slag, 25-50 portions of slag, 10-20 portions of plaster, 1-10 portions of auxiliary materials and 1-10 portions of alkaline composition, wherein the auxiliary materials are admixtures of active CaO, active Al2O3 and active SiO2, and the alkaline composition is at least one of cement clinker and calcium hydroxide. The preparation cost of the super-sulfate cement can be effectively reduced, and the phosphorus slag super-sulfate cement fully utilizes the phosphorus slag resource with rich sources. Meanwhile, the setting and hardening speed of the phosphorus slag super-sulfate cement is high, and the initial setting and final setting time and the mechanical property conform to the requirement of GB175-2007 on P.O42.5 ordinary portland cement.

Description

technical field [0001] The invention relates to a super sulfate cement and a preparation method thereof, in particular to a phosphorus slag super sulfate cement and a preparation method thereof. Background technique [0002] Super sulfate cement is a hydraulic cementitious material prepared by grinding 75-85% slag, 10-20% sulfate and 1-5% alkaline components together or separately. , is a new type of cementitious material that is superior to ordinary Portland cement in many aspects such as energy consumption and air pollution reduction. However, due to the gradual recognition of the contribution of slag to the properties of cement and concrete, especially the mechanical properties and durability, it has been widely used as a highly active admixture in various engineering structures, and slag is increasingly becoming a scarce resource. It restricts its large-scale application and promotion in the cement industry, especially the ultra-sulfate cement industry. [0003] Invent...

AI Technical Summary

Problems solved by technology

However, due to the gradual recognition of the contribution of slag to the properties of cement and concrete, especially the mechanical properties and durability, it has been widely used as a highly active admixture in various engineering structures, and slag is increasingly becoming a scarce resource. Restricts its extensive application and promotion in the cement industry, especially in the super sulfate cement industry

[0003] Inventions such as "Steel Slag Super Sulfate Cement and Its Preparation Method", "Nichrome-Fe Alloy Slag Super Sulfate Cement and Its Preparation Method" and other inventions disclose the physical properties and the Mechanical properties, but this type of invention does not make any instructions on the replacement of slag by granulated electric furnace phosphorus slag (referred to as phosphorus slag) to prepare super sulfate cement, nor does any treatment of industrial waste gypsum such as desulfurization gypsum and phosphogypsum, and is directly applied to industrial The strength of super sulfate cement prepared from waste gypsum is low at all ages. The strength of 7d is about 20MPa, and the strength of 28d is about 35MPa.

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