Technology for performing recycling pretreatment on zinc smelting low-pollution jarosite process jarosite slag

Abstract

A technology for performing recycling pretreatment on zinc smelting low-pollution jarosite process jarosite slag comprises the following steps: evenly mixing low-pollution jarosite process jarosite slag with a bonding agent and broken coal according to mass ratio of 1 to 0.08 to 0.08 and then pelleting; then, entering a calcining kiln and sintering for reduction at 1200 to 1400 DEG C; collecting dust after sintered slag is reduced to be less than 2 percent in sulfur content and produced flue gas is cooled to be not higher than 180 DEG C; then, purifying the flue gas; and finally, entering an acid making system to make acid by gas mixing. According to the technology provided by the invention, the flue gas enters after zinc in the jarosite slag is reduced and volatilized for about 70 percent and lead, cadmium and indium are reduced and volatilized for about 85 percent, and thus, these valuable metals are recycled to produce benefit; the sulfur content of the sintered slag reduced by sintering is less than 2 percent, and thus, heavy metal is further reduced, and the sintered slag is transform into a production raw material that a cement manufacturer likes using; benefit is produced, and the whole process has no environmental pollution; and through the process, hazardous wastes of the jarosite slag are harmlessly and comprehensively utilized.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal treatment, and relates to a process for treating zinc smelting slag, in particular to a process for resourceful pretreatment of zinc smelting low-pollution jarosite slag. Background technique [0002] The main components of jarosite (ammonium) jarosite are jarosite (ammonium) jarosite, zinc sulfate, zinc oxide, lead oxide, lead sulfate, zinc ferrite, zinc sulfide, indium compounds and silicates, etc., iron Alum slag can be divided into general jarosite slag and low-pollution jarosite method jarosite slag according to different processes. The main element content in general jarosite slag is: zinc 4.5-6.5%, lead 2.5-4.0%, iron 26-30% %, sulfur 9-11%, water 30-40%, silver 100-200g / t, the main element content in the jarosite slag of low-pollution jarosite method is: zinc 1.5-2.5%, lead 0.5-1.0%, 20-30% iron, 9-11% sulfur, 30-40% water, 50-100g / t silver, because alum slag contains heavy metals and is ...

AI Technical Summary

Problems solved by technology

According to investigation and experimental research, this slag is currently the only one that can be used in cement and other building materials industries, but cement manufacturers have higher requirements for moisture and sulfur content. High moisture will consume more energy, and high sulfur will limit the amount of addition. Costs have also become a disposal problem