Process for treating iron vanadium slag by virtue of dry-process rotary kiln

Abstract

The invention discloses a process for treating iron vanadium slag by virtue of a dry-process rotary kiln. The process comprises the following steps: breaking the iron vanadium slag, and feeding into a rotary dryer for drying to obtain tail gas with ammonium carbonate, wherein drying hot air is hot air at the tail of the dry-process rotary kiln; grinding deaminized iron vanadium slag, adding a bonder and water, feeding into a multistage cyclone treatment device, and desulfurizing to obtain iron oxide and tail gas; feeding the tail gas generated by the desulfurization of the iron vanadium slag into a sulfuric acid workshop to produce sulfuric acid; washing the iron oxide, recovering valuable metals, and taking the washed iron oxide as a steelmaking material. According to the process, all heat sources are residual heat of the dry-process rotary kiln, so that the economic and environment-friendly benefits are remarkable.

Description

technical field [0001] The invention relates to a treatment method for harmful waste residue in smelting industry. Background technique [0002] In the past ten years, my country's lead-zinc metallurgy has maintained a momentum of rapid growth. In 2010, the total output of lead-zinc reached 9.581 million tons. For a hydroelectric zinc plant with an annual output of 100,000 tons, if the zinc concentrate contains 8% iron, the annual output of jarosite slag (referred to as jarosite slag) is about 53,000 tons [Chen Yongming, Tang Mo Tang, Volume 19, Issue 7, Chinese Journal of Nonferrous Metals, Yang Shenghai, etc., NaOH decomposition of indium-containing ferrite slag new technology [J], Chinese Journal of Nonferrous Metals, 2009, 19 (7): 1322-1331]. my country's lead-zinc metal production has ranked first in the world for many years. With the rapid development of product production capacity, the problem of the treatment of jarosite slag in the production process has gradually...

AI Technical Summary

Problems solved by technology

Although the existing method can recycle iron oxide and sulfur oxide, it needs additional energy to heat the jarosite slag, and the separation of ammonia and sulfur oxide is difficult, which is not conducive to recovery

In addition, the grains of the alumite slag are relatively fine (1-10μm). During the desulfurization treatment, due to the further removal of sulfur and water, the bonding ability between the grains will be weakened, and a finer powder will be obtained, which is not conducive to desulfurization. Separation of gases and solids

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