A kind of slag Portland cement and production method thereof

Abstract

The invention relates to a portland blast furnace slag cement and a preparation method thereof. The portland blast furnace slag cement is prepared from the following raw materials by weight percent: 12%-30% of at least one of slag, coal gangue, boiling slag, liquid slag, cinerite, kiln dust and crushed tile, 10%-42% of mineral waste residue, steel slag or silicomanganese slag, 0-12% of limestone, 2%-8% of gypsum, 0-10% of zeolite, 0-17% of boiling slag, 0-10% of coal ash, and 10%-50% of silicate series cement. The preparation method comprises steps of putting the slag, mineral waste residue, gypsum, zeolite, boiling slag, and coal ash into a pulverizer to be smashed, grinding by a ball mill to achieve the fineness of 0.08mm, sieving by a square hole sieve with 2% left, and then mixing with the silicate series cement. The portland blast furnace slag cement has the advantages of having a simple preparation method, needing no cement clinker, guaranteeing the strength and stability of the cement, fully using industrial residue resources like slag and mineral waste residue, lowering production cost, and reducing the pollution of industrial residue to the environment.

Description

technical field [0001] The invention relates to a slag portland cement and a production method thereof. Background technique [0002] The existing cement production process is to produce cement clinker first, that is, the raw materials: limestone, iron powder, clay, coal gangue, shale, gypsum, fluorite and coal are ground according to the required ratio, and after reaching a certain fineness , After calcination to produce a semi-finished product - cement clinker, then add different types of mixed materials and gypsum, and carry out the second grinding to make it reach a certain fineness, and then become the finished product - cement. The disadvantage of this method of producing cement is that clinker production is necessary, and the clinker calcination process consumes a lot of energy, and at the same time causes serious pollution to the environment, and the production process is complicated and the product quality fluctuates greatly. In addition, there are many areas where...

AI Technical Summary

Problems solved by technology

The disadvantage of this method of producing cement is that there must be a link of clinker production, and the clinker calcination process consumes a lot of energy, and at the same time causes serious pollution to the environment, and the production process is complicated, and the product quality fluctuates greatly.

In addition, there are many areas where clinker production conditions do not exist, such as fuel but no limestone, limestone but no fuel

In some areas, there are a large number of mixed materials, such as iron factories, ferroalloy factories, and iron and steel factories. The waste residues discharged are piled up like mountains and cannot be used

There are also mountainous areas that store a large amount of zeolite rocks and volcanic ash rocks, but lack of clinker production conditions and cannot produce cement

In the northern region, a large amount of coal is used for heating in winter, and a large amount of slag ash is produced. Except for a small part for insulation and brick burning, a large amount is discharged into nature, which not only pollutes the environment, but also occupies land resources, which is a big waste.

The cement needed in these areas has to be shipped from far away, and the price is very high, which not only increases the construction cost, but also causes a waste of energy and resources