A kind of steel slag sand production process and system

Abstract

The present invention relates to a process for producing steel slag sand, which comprises the following steps: S1, steel slag crushing and screening: crushing and sieving the steel slag raw slag, screening with 10mm sieve holes, and the lower part of the sieve enters the next process; S2, iron removal; S3, spray, add water of 8-12% of the raw material quality; S4, high temperature and high pressure digestion, pressure ≥ 2.0Mpa, temperature ≥ 215 ℃, holding time ≥ 3h; S5, cooling screening: cooling the steel slag after high temperature and high pressure digestion , and then perform multi-stage screening according to the particle size to obtain steel slag sand products of different specifications. According to the process of the present invention, the raw steel slag is used as the raw material to make sand, and the steel slag sand with an expansion rate of less than 0.5% can be obtained, which can completely replace the natural sand and machine-made sand and be applied to various roads, precast concrete components, pipe products and buildings. In the field of application, the stability defect of traditional concrete mixed with steel slag sand is eliminated.

Description

technical field [0001] The invention relates to the technical field of steel slag sand, in particular to a production process and system of steel slag sand. Background technique [0002] my country is a big country in terms of consumption of steel. A large amount of steel slag is produced in the steel production process, and its proportion is 10-20% of the crude steel. With the increase in steel production, my country's steel slag production has stored more than 200 million tons. Steel slag is a by-product of the steelmaking process. Steel slag is formed at a high temperature of 1500-1700 °C, and is nicknamed "perfired silicate clinker". The annual output of solid waste converter steel slag in the iron and steel industry exceeds 100 million tons, but its comprehensive utilization rate is less than 30%. A large amount of steel slag accumulates, which will occupy arable land, pollute water sources, and cause serious environmental pollution. In order to improve resource uti...

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Problems solved by technology

[0004] However, the expansion rate of traditional steel slag sand is relatively large, resulting in serious stability defects in concrete containing steel slag sand

At present, steel slag sand still cannot replace natural sand or machine-made sand, so its application in many construction occasions is limited

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