Process of smelting iron pyrite

Abstract

The invention discloses a process for smelting iron pyrite. The process for smelting iron pyrite comprises the following steps of: smelting the iron pyrite by an oxidizing smelting method to generate noble metal enriched sulfonium, high-iron melting slag, and SO2-contaiing high-temperature flue gas, allowing the sulfonium to deposit on the bottom layer of a hearth and discharging; after the sulfonium is separated from the high-iron melting slag, reducing and smelting the high-iron melting slag in a smelting furnace of a reduction smelting pool to generate cast iron; recovering the noble metalfrom the discharged sulfonium; and recovering afterheat from the exhausted high-temperature flue gas, and making acid. The oxidizing reaction heat of the iron pyrite and the sensible heat of the melting slag can be fully used, so that the process has an obvious energy-saving effect. During oxidization, valued metals, such as the noble metal, copper, lead and the like are collected in the sulfonium, and a part of lead, zinc and the metal which is easy to volatilize at high temperature is collected in smoke dust. During reduction, the zinc is volatilized and collected in the smoke dust, and a large amount of sulfur is volatilized during oxidization and smelting, enters the flue gas and then is delivered for acid making. Therefore, the method has a good comprehensive effect.

Description

technical field [0001] The invention relates to a pyrite smelting process. Background technique [0002] With the rapid development of my country's economy, the demand for energy is increasing, and the impact on the environment is also becoming more and more serious. For this reason, the country vigorously advocates the development and application of new technologies for environmental protection and energy conservation. Energy saving, environmental protection, and consumption reduction have become major issues facing my country's smelting enterprises. Large-scale smelting enterprises have carried out technological upgrading and transformation one after another, through transformation to expand production capacity, reduce energy consumption indicators, and improve the environment. The widely used smelting technology of pyrite is boiling roasting. That is, the pyrite is roasted by boiling, most of the sulfur enters the flue gas to make acid, the calcined sand is cooled, and t...

AI Technical Summary

Problems solved by technology

Disadvantages of this process: 1. Incomplete removal of arsenic and sulfur, high content of arsenic and sulfur in slag beneficiation iron ore; 2. Cannot recover precious metals, heavy metals such as copper and lead, and volatile metals

3. The hot calcined sand is cooled and beneficiated, and used as iron-making raw material, which consumes a lot of energy

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