Preparation method of tailing micropowder portland cement

Abstract

A preparation method of tailing micropowder portland cement comprises the following steps of: (1) crude material crushing; (2) raw material preparation; (3) clinker sintering; (4) powder grinding; (5) packaging; wherein the step (4) of powder grinding comprises the following substeps: 1. grinding 95-97% of the clinker and 3-5% of gypsum together with an added cement grinding aid to obtain a clinker micropowder intermediate; 2. adding 0.2-0.5 per thousand kg of polycarboxylic acid-alcohol amine high polymer and 0-5% kg of gypsum into 1 kg of metal tailing slag, mixing, drying and grinding to obtain a tailing micropowder intermediate; 3. mixing and grinding 95-80% of the clinker micropowder intermediate and 5-20% of the tailing micropowder intermediate, or 60-80% of the clinker micropowder intermediate and 20-40% of the tailing micropowder intermediate, or 50-80% of the clinker micropowder intermediate, 15-45% of the tailing micropowder intermediate and 5% of slag powder to obtain various tailing micropowder portland cement. Through individual grinding and then mixing grinding, high fineness and high activity are realized; the potential activity of the tailing is aroused; and the rheological property of the cement is improved.

Description

Technical field: [0001] The invention relates to a cement production method, in particular to a method for preparing tailings micropowder Portland cement. Background technique: [0002] As the most important building structure material, cement is in increasing demand. However, cement plants are well-known sources of pollution. Cement production consumes a large amount of non-renewable resources such as limestone, clay, and coal, and simultaneously emits hundreds of millions of tons of CO 2 , SO 2 and NO x Waste gas and dust, such as waste gas and dust, the resource consumption, energy consumption and environmental pollution in the production process are very prominent. The development of ecological cement and green cement is the direction to realize the sustainable development of the cement industry. [0003] Related to Portland cement products and preparation methods thereof in the existing disclosed technologies are: such as the invention patent CN1213654A "composite Po...

AI Technical Summary

Problems solved by technology

The disadvantage is that: clinker (tailings) is mixed with other minerals, and the unreasonable matching of finished product particles due to the difference in grindability is prominent, and the potential chemical and physical effects of various materials cannot be stimulated and mobilized. function, the tailings used are basically limited to calcium and magnesium tailings

Images