Gradient utilization method of high-sulfur low-silicon iron tailings

Abstract

The invention relates to a gradient utilization method of high-sulfur low-silicon iron tailings. The gradient utilization method comprises the following steps: (1) sieving by utilizing a 60-80-mesh sieve, wherein about 70% of tailings are remained on the sieve, and about 30% of tailings are sieved; (2) preparing a standard cement mortar product from the about 70% of rough tail sand on the sieve instead of 50-60% of river sand; and (3) separating 6.14% of sulfur ore concentrate from the about 30% of sieved fine tailings by virtue of flotation desulfurization so as to prepare sulfuric acid, carrying out iron separation on 24.6% of fine sand by utilizing a strong magnetic separation technique after the sulfur separation, preparing a high-activity tailing slag admixture by utilizing the residual 7.14% of high-silicon-content tail sand after the iron separation, and directly utilizing 17.47% of high-iron-content tail sand separated through the strong magnetic separation as a raw material to sinter cement in a cement plant, wherein the sulfur grade of the sulfur ore concentrate reaches 44.65%, and the iron grade of high-content iron slag remained after the sulfuric acid preparation reaches 63%. According to the gradient utilization method, the utilization range of the iron tailings is extended from barren rock and iron tailing sand obtained in a mountain cutting process to the tailing slag admixture, so that 100% gradient utilization of mine waste is realized.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of iron tailings resources, and in particular relates to a stepwise comprehensive utilization method of high-sulfur and low-silicon iron tailings. Background technique [0002] my country is a big mining country, and the amount of tailings accumulated and discharged due to the development of mineral resources is huge every year. The amount of tailings produced by countries in the world is about 5 billion tons every year, and the amount of tailings produced in my country alone in 2000 reached 600 million tons. Left and right, the grade of most mine resources in my country is low, and a large amount of tailings are discharged in the beneficiation process. With the improvement of the utilization degree of mineral resources, the mineable grade of ore is correspondingly reduced, and the discharge of tailings is also increasing. At present, my country There are about 10 billion tons of t...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems existing in the application of iron tailings in the building materials industry at present, aiming at the efficient recovery and utilization of valuable components in iron tailings, the overall utilization of high added value and the production of green and environmentally friendly bulk building materials, Solve the problems of comprehensive utilization value and utilization rate of iron tailings, and provide a cascade utilization method of high-sulfur and low-silicon iron tailings

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