Preparation method of raw material for solid waste synergistic complementary preparation of sulphate aluminate cement

Abstract

The invention relates to a preparation method of a raw material for solid waste synergistic complementary preparation of sulphate aluminate cement, and belongs to the technical field of sulphate aluminate cement. The preparation method comprises: respectively drying and grinding high-water-content solid waste such as carbide slag and red mud and solid waste such as aluminum slag and fly ash, wherein the carbide slag and the red mud are subjected to beating drying in a drying crusher, and the fly ash, the aluminum slag, and the coarse particles in the carbide slag and the red mud are grinded ina ball mill; and mixing and homogenizing the dried and grinded materials to obtain the sulphate aluminate cement raw material. According to the present invention, the preparation method has advantages of simple process, convenient operation, strong drying capability, low power consumption of grinding, reasonable product particle distribution and the like.

Description

technical field [0001] The invention belongs to the technical field of sulphoaluminate cement, and in particular relates to a raw meal preparation method for preparing sulphoaluminate cement by synergistic complementation of solid waste. Background technique [0002] At present, waste refers to the discharge that basically or completely loses its use value within a certain time and space range and cannot be recycled and utilized. However, certain solid wastes, such as coal gangue, fly ash, cinder, blast furnace slag, steel slag, etc., have the components and properties required for building materials, and can be used to make building materials. [0003] In the process of building materials utilization of industrial and urban bulk solid waste, there are fundamental problems such as small amount of solid waste, high product cost, poor performance, low added value, and difficult market development. The preparation of sulphoaluminate cement through synergy and complementarity o...

AI Technical Summary

Problems solved by technology

When the mixed grinding process is used to prepare raw meal, it has the following three defects. First, in the finished raw meal, finer materials such as red mud and carbide slag enter the ball mill, which will cause over-grinding and waste energy; Second: In terms of the distribution of raw material components, raw materials such as fly ash and aluminum slag are mainly concentrated in the coarser particles, while the particles of red mud and carbide slag are mainly concentrated in the finer parts. During the subsequent sintering process , the rate constant K in the reaction kinetic equation of sintering is inversely proportional to the particle radius R 2 , so the reaction rate and completeness of raw materials in the kiln system are affected by the particle size of fly ash and aluminum slag, which in turn affects the output of the kiln system and the quality of aluminate clinker; The adaptability of raw material moisture is poor. If the material moisture is too high, it will affect the uniformity of feeding in the dry ball mill and prolong the feeding time. Secondly, due to excessive feeding of wet materials, it may cause balls inside the dry ball mill. , the phenomenon of sticking the lining board occurs, and even there are problems such as being forced to stop grinding due to full grinding

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