Grinding method of slag and steel slag composite micro-powder in roller press

Abstract

The invention discloses a grinding method of slag and steel slag composite micro-powder in a roller press. The method is characterized by comprising: A) a step of feeding raw materials into a factory;B) a step of preparing raw materials; C) a step of humidifying and mixing the materials; D) a step of rolling and grinding the mixture; E) a step of performing static selection and drying, namely a step of lifting material cake discharged from the lower part of the high-pressure roller press to an static powder classifier through a bucket elevator, scattering the material cake, then providing hotwind by a gas hot air furnace to dry the scattered fine powder particles, separating scattered qualified fine powder particles, feeding the qualified fine powder particles to a first cyclone screening device to be collected, then feeding the particles to a dynamic powder classifier, then allowing the obtained particles to pass through a second cyclone screening device to obtain a finished product, and loading the finished product into a truck and warehousing the finished product. According to the method, the steel slag can be effectively processed and recycled, the investment is small, the power consumption per ton is less than 40 KWh, the production cost is greatly reduced compared with other production modes, and the composite micro-powder has stronger competitive advantages no matter the composite micro-powder is used as a cement admixture or a concrete admixture.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of available resources of slag and steel slag, and in particular relates to a final grinding method of slag and steel slag composite micropowder roller press. Background technique [0002] Slag has been widely used. It is made of slag and processed into slag cement, slag powder, slag powder, slag portland cement, slag wool, granulated blast furnace slag powder, etc. [0003] Steel slag is a by-product of the steelmaking process. According to the current level of steelmaking at home and abroad, its output is 10% to 15% of the crude steel output. So far, people have developed nearly 40 methods related to the comprehensive utilization of steel slag, but so far no effective way of large-scale resource utilization of steel slag resources has been found. Realizing "zero discharge" of steel slag is a difficult problem in the world's steel industry. [0004] The relative utilization rate of steel slag i...

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Problems solved by technology

[0004] The relative utilization rate of steel slag is relatively low, and the internal recycling methods of steel mills such as recycling scrap steel, magnetically separated iron powder, and use as flux are the main methods, and the amount of use is limited. Environmental pollution, waste of resources and other issues

Because the steel slag is formed at high temperature in steelmaking, the dicalcium silicate and tricalcium silicate minerals in the steel slag crystallize completely, the grains are coarse and dense, and the hydration hardening speed is slow

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