Manufacture of sulphur aluminate cements with electrolytic manganesium residue and method of manufacturing the same

Abstract

A sulphate-aluminium-like cement produced by using electrolytic manganese slag and the preparation method of the cement relate to the production of the sulphate-aluminium-like by using industrial wastes and the preparation method of the cement. The raw materials of the cement clinker of the invention contain limestone, electrolytic manganese slag, kaolin and soft coal, and dihydrate gypsum is added to the fired cement clinker; the preparation method comprises the following steps: using the limestone, electrolytic Manganese slag, kaolin and soft coal as the raw materials of the clinker; first,levigating and homogenizing the raw materials, and calcining the raw materials into the clinker at a relatively low temperature; then adding the dihydrate gypsum to the clinker according to the requirement and then levigating the mixture to be the finished product. The cement is characterized in that the firing temperature ranges from 150 DEG C to 200 DEG C which is lower than that of the common Portland cement, and the energy-saving advantage is obvious; the mixture proportion range of the components is wide; the mixing amount of the manganese slag is great; and the fired cement has wide application, and so on. The preparation method can be widely used for producing the sulphate-aluminium-like cement by using electrolytic the manganese slag, and is in particular applicable to the production of early strength cement, rapid-hardening high-strength cement, expansive cement and low-alkali cement, and the like.

Description

technical field [0001] The invention belongs to the technical field of cement, and in particular relates to preparing sulphoaluminate-like cement by using industrial waste and a preparation method thereof. Background technique [0002] Electrolytic manganese slag is a solid waste produced in the process of industrial production of electrolytic manganese and manganese dioxide. Its fineness reaches 0.15mm, and the moisture content of the original electrolytic manganese slag is 30% to 40%, which is in the form of agglomeration. my country is the world's largest producer of manganese, and its annual output of manganese in recent years has accounted for more than 90% of the world's total output. One ton of electrolytic manganese produced by the manganese carbonate method produces an average of 6.5 tons of electrolytic manganese slag. The electrolytic manganese slag produced in my country reaches several million tons every year, and the amount of electrolytic manganese slag stored...

AI Technical Summary

Problems solved by technology

The preparation methods of the above two patents are: first mix and grind the raw materials, then put them into the warehouse for homogenization, add water to stir and form into balls, and finally calcinate the cement clinker and cementitious materials. The calcining process is more complicated.

[0007] The first patent mentioned above is to replace clay with electrolytic manganese slag to produce ordinary Portland cement instead of sulphoaluminate cement. However, the national standard stipulates that the sulfur content (in terms of sulfur trioxide) in ordinary Portland cement shall not exceed 3.5%, from It can be seen from the above table that when electrolytic manganese slag is used to produce ordinary Portland cement, the high content of sulfur in it will cause the risk of excessive sulfur content in the produced cement; the coal used has a high ignition point and low volatile content, which is not conducive to cement calcination ; There is no outstanding energy-saving feature in the preparation of cement; the amount of electrolytic manganese slag is limited, it is not an effective way to consume a large amount of electrolytic manganese slag, and it does not make much contribution to solving the environmental pollution caused by it

The second patent still uses anthracite with a high ignition point and low volatile content as fuel, which is not conducive to calcination. The calcination temperature of the cementitious material is 800±50°C, and it is difficult to form components with gelling properties; in the fired cementitious material Equipped with a certain amount of mineralizer, the composition characteristics of electrolytic manganese slag have not been fully considered and utilized

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