Comprehensive utilization method of middle and low grade ferro-sulphur ore

Abstract

The invention discloses a comprehensive utilization method of middle-low grade pyrite. The method is characterized in that each layer of the pyrite is exploited, directly smashed and added to a fluidized bed furnace for roasting in the fluidized bed to obtain sulfur dioxide gas and cinder; the sulfur dioxide-containing gas is used for producing sulfuric acid or sulfur; component adjustment is carried out after iron ore concentrate powder is magnetically separated from the cinder, or carried out directly on the cinder by adding metallic mineral or non-metallic mineral according to the subsequent product and the fusion temperature; then, according to the mass of the monoatomic carbon which is needed to reduce each oxide in the adjusted cinder into the monoatomic metal by carbothermic reduction, a reducing agent which is 1.1-3 times of the mass is added; and a deoxidizer and a desulfurizer of high-quality metallurgical composite alloy are produced after reduction. The method solves the environmental pollution problem of the existing utilization technology and realizes each layer exploitation and cyclic comprehensive utilization of the middle-low grade pyrite.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for recycling and comprehensively utilizing by-product metallurgical high-quality composite deoxidizers and desulfurizers in full-layer mining of medium and low-grade pyrite. Background technique [0002] my country is rich in pyrite resources, accounting for 10% of the world's total reserves, ranking third, but most of them are of medium and low grades. Rich ore (≥35%) only accounts for about 4% of the total reserves, and the average geological grade is 17.68%. Pyrite is the main sulfur resource in my country, accounting for 80% of the total sulfur resources; in the total pyrite resources, single pyrite accounts for 53%, and associated pyrite accounts for 27%. [0003] Pyrite deposits in the Liupanshui Economic Zone of my country are produced in the Upper Permian coal-bearing rock series, and the upper part of the rock series is coal-bearing deposits of marine-terres...

AI Technical Summary

Problems solved by technology

[0004] The main beneficiation method for producing sulfur concentrate from pyrite is flotation, followed by gravity separation, magnetic separation or flotation-magnetic combined separation; according to statistics, 15% to 30% of the pyrite in the tailings has not been selected, and the production 1 ton of sulfur fine sand requires 3 to 3.5 tons of raw ore, 10 to 15 tons of water, generally produces 2 to 2.5 tons of waste residue, and 12 tons of waste water. The sulfur content of tailings is often above 7%, and the utilization rate of sulfur resources is less than 58%. Iron ore tailings are actually high-titanium, iron-containing pyrite kaolinite clay rocks that coexist with pyrite. It can be seen that the content of kaolinite in the tailings is nearly 90%, which is an important renewable resource available for use. Utilization not only wastes a lot of precious resources, but also has no power to deal with a large amount of tailings, which has caused serious harm to the local ecological environment, industrial and agricultural production, and people's health, and caused serious pollution to the surrounding waters and other environments.

The production of sulfur concentrate from pyrite has a single product, a short industrial chain, and comprehensive utilization of resources, which not only loses the benefits of mineral resources but also causes serious pollution to the local environment. serious

[0005] Indigenous sulfur refining method has a low sulfur yield (actually only 38-40%), seriously pollutes the environment, and has poor economic and social benefits

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