Preparation method for calcinating hydraulic binder at low temperature

Abstract

The invention discloses a preparation method for calcinating a hydraulic binder at low temperature. The preparation method is characterized by comprising the following steps: weighing components according to a raw material constitution of 25-35% of pyrite smelting slag and 65-75% of limestone by mass percent, and crushing, milling and uniformly mixing the components to prepare a mixed material; feeding the mixed material at 1150-1350 DEG C to calcinate for 30-120 minutes, and quenching to prepare a clinker; and adding dehydrate gypsum which accounts for 0-30% of the mass of the clinker into the clinker, mixing, milling until the specific surface area is 400-500m<2> / Kg, and thus obtaining the hydraulic binder. According to the method, the industrial waste residues such as pyrite smelting slag serve as a raw material to prepare the hydraulic binder which utilizes belite and iron phase as main minerals; after the method is adopted, a brand-new cement mineral system is provided, and wastes are also greatly utilized, so that the cement production cost is lowered, the calcinating temperature is reduced, an environmental benefit is improved, and the prepared hydraulic binder has excellent performance.

Description

technical field [0001] The invention belongs to hydraulic gelling materials, and relates to a preparation method of low-temperature firing hydraulic gelling materials. It is especially suitable for the preparation of hydraulic cementitious materials from industrial waste - pyrite slag (or other industrial waste rich in iron, aluminum, silicon and other elements), etc. The prepared hydraulic cementitious material is suitable for construction Material. Background technique [0002] At present, cement has become the most widely used hydraulic cementitious material. my country's special cement mainly consists of the following three series, namely (1) sulphoaluminate cement with C4A3S, β-C2S and gypsum as main components series; (2) Ferro-aluminate cement series with C4AF, C4A3S, β-C2S and gypsum as main components; (3) Fluoroaluminate cement with C11A7 CaF2, β-C2S and gypsum as main components series. With the rise of the global energy conservation and emission reduction movem...

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Problems solved by technology

[0003] In the prior art, the preparation of ordinary Portland cement mainly has the problems of high calcination temperature (>1350°C), high limestone content (CaO65-75%), and a large amount of fuel is used, which increases heat consumption and high carbon dioxide emissions. It is not conducive to the protection of resources, energy and the environment, and is contrary to the strategic requirements of China's sustainable development

However, there are many kinds of special cements and their classifications are complex, and their preparation still requires precious mineral resources such as bauxite, which is not conducive to the protection of the ecological environment and the conservation of resources.

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