All-solid-waste ecological cementing material

Abstract

The invention provides an all-solid-waste ecological cementing material and relates to the field of building materials. The all-solid-waste ecological cementing material is prepared from raw materialsin parts by mass as follows: 100 parts of solid waste, 1-5 parts of a chemical activator, 0.5-1 part of a water reducing agent and 0.5-1 part of a defoaming agent, wherein the solid waste is preparedfrom 50%-70% by mass of ferro-nickel residues, 10%-30% of slag, 5%-10% of fly ash, 0-10% of gypsum and 5%-10% of steel slag. According to the all-solid-waste ecological cementing material, the ferro-nickel residues, the slag and the steel slag are taken as raw materials, utilized as a clinker source of the cementing material and supplemented with industrial solid waste such as industrial byproducts gypsum and fly ash, and one low-hydration-heat ecological cementing material capable of partially replacing Portland cement is prepared by mechanical excitation and chemical excitation. Efficient recycling of the industrial metallurgical slag such as the ferro-nickel residues, the slag and the steel slag is realized, and usage amount of Portland cement clinker is effectively reduced. Compared with the Portland cement, the all-solid-waste ecological cementing material has the characteristics of low hydration heat and good sulfate corrosion resistance.

Description

technical field [0001] The invention provides an all-solid waste ecological gelling material, which relates to the fields of solid waste treatment, resource utilization and building materials. Background technique [0002] Ferronickel slag is industrial waste produced by water quenching and quenching after reducing and extracting nickel and some iron. With the gradual expansion of the scale of nickel-iron alloy smelting in my country, the discharge of nickel-iron slag is also gradually increasing. In recent years, the annual discharge of ferronickel slag in my country has exceeded 30 million tons, and it has become the fourth largest smelting slag in my country after iron slag, steel slag and red mud. A large amount of ferronickel slag is stacked or buried in deep sea, which not only occupies land and pollutes the environment, but also poses severe challenges to the sustainable development of ferronickel smelting. Therefore, research on the comprehensive utilization of fer...

AI Technical Summary

Problems solved by technology

Chinese patent CN108218269A discloses a nickel-iron slag cementitious material and its preparation process. In the preparation process, the nickel-iron slag raw material is used as a cement admixture, and the comprehensive content of the nickel-iron slag is only about 18%. The production rate is low; the preparation method includes strong alkali activation, hydrothermal reaction, low-temperature calcination and other processes, the preparation process is complex, the material and comprehensive energy consumption are high, and the economy is poor

Chinese patent CN106477925A discloses a kind of less clinker cement, and this patent uses ferronickel slag micropowder as cement admixture material, but the activity of ferronickel slag micropowder is low, needs to add a large amount of activators to improve the activity of ferronickel slag and slag, and The introduction of a large amount of activators will easily lead to an excessively high alkali content in the cementitious material, increasing the water demand of the cementitious material, and applying it to concrete will increase the risk of concrete alkali aggregate damage

[0005] To sum up, there are few recoverable valuable metals in ferronickel slag, high magnesium and low calcium, and low activity, resulting in fewer comprehensive utilization channels for ferronickel slag

The activity of ferronickel slag itself is low. In order to ensure the mechanical strength of the product, the amount of ferronickel slag used as an admixture generally cannot exceed 20% of the total ash. It is difficult to ensure the utilization rate and product performance of ferronickel slag at the same time.

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