Zinc smelting technology

Abstract

The invention discloses a zinc smelting technology. The zinc smelting technology comprises the following step that high-iron sphalerite concentrate is subjected to calcination, neutral leaching and low-acid leaching; zinc ferrite is separated from the low-grade leaching residues by a magnetic separator and the non-magnetic leaching residues are further treated by high-acid leaching; and the zinc ferrite is decomposed into ferroferric oxide and zinc oxide by reduction roasting, and the ferroferric oxide and the zinc oxide are used respectively as a magnetic seed and a neutralizer used in a leachate magnetofluid iron-removal technology. Through combination of a wet method and a fire method, a zinc leaching rate and a lead and silver recovery rate are improved, and the calcinations of the zinc ferrite are used in the magnetofluid iron-removal technology so that an iron-removal technology cost is effectively reduced and iron residues are pure, have high iron content and are conducive to iron residue comprehensive utilization. The zinc smelting technology can efficiently prepare high-quality zinc leachate, utilize agents having wide sources and a low cost, prepare a very-low iron-content zinc leachate, greatly improve the efficiency of the zinc wet method smelting technology, basically prevent a valuable metal loss and promote resource comprehensive utilization.

Description

technical field [0001] The invention discloses a new zinc smelting process, which belongs to the smelting process method. Background technique [0002] In the process of hydrometallurgy, acidic solution is often used to leach ore, and iron in minerals often enters the solution in the form of trivalent or divalent ions. Iron removal is the most common and important process in hydrometallurgy due to the great hazards of iron in subsequent processes such as electrodeposition. The problem of iron removal by precipitation in zinc smelting process is the most representative in hydrometallurgy. Zinc sulfide concentrate generally contains 5%-15% iron. When zinc and other non-ferrous metals enter the solution during the leaching process, iron also enters the solution to varying degrees. When the high temperature and high acid leaching process is used, the form of zinc ferrite (ZnFe 2 o 4 ) has a zinc leaching rate of more than 90%, which significantly improves the extraction rate...

AI Technical Summary

Problems solved by technology

But they all have their own defects: the shortcoming of the jarosite method is that the amount of slag is large, the iron grade is low, and the consumption of sulfuric acid is large; the main point of the goethite method is to keep the ferric ion concentration in the solution low during the precipitation process Level, if it is lower than 1g / L, the process efficiency is low, the filtered material liquid is large, the power consumption is large, the acid balance is difficult to control, the acid and alkali consumption is large, and the equipment is relatively complicated; the hematite method is the richest in iron removal. The attractive thing is that this method has less amount of iron and iron slag and higher iron content, but requires a higher pH value and the highest energy consumption, steam consumption accounts for about 60% of the whole plant

Their common defects are that the sedimentation speed is slow, the aging time is long, the fine particles are difficult to filter, and the grade of the sediment residue is not ideal, and the comprehensive utilization is difficult.

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