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Process for silver extraction by acidifying calcination and leaching of lead silver slag

A technology of acidification roasting and lead-silver slag, which is applied in the field of comprehensive utilization of metallurgical resources, can solve the problems of not performing separate comprehensive recycling and utilization, and achieve good environmental benefits, simple equipment, and good development prospects

Active Publication Date: 2011-11-23
NORTHWEST RES INST OF MINING & METALLURGY INST
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Problems solved by technology

[0005] At present, the comprehensive utilization of lead and silver slag in the domestic zinc smelting system is mainly: the lead and silver slag is incorporated into the lead smelting batching system, and no separate comprehensive recycling is carried out

Method used

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Embodiment Construction

[0024] A silver-extracting process of lead-silver slag acidification roasting leaching, the specific steps are as follows:

[0025] A: Water immersion: The soluble zinc sulfate in the lead-silver slag is removed and separated by water immersion. The water immersion temperature is 15-25°C, and the time is 3, 4 or 5 hours. The ratio is 1:3, the immersion solution can be used as zinc electrolyte when it is returned to the zinc factory, and the leaching residue contains 200g / t of silver for use as a spare;

[0026] B: Acidification roasting: Add the mixture of leaching slag weight kg: 98% sulfuric acid volume 1: 0.4~1 in A containing 200g / t of silver into the mixing tank and stir evenly, and place it in a fully closed rotary kiln. Heating to 200°C, 300°C, 400°C, 500°C, 600°C or 700°C, keeping it for 2, 3, 4, 5, 6, 7 or 8 hours, and slowly cooling to room temperature to obtain calcined sand for use; the leaching residue Zhongyin mainly exists in the form of sulfide. Aft...

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Abstract

A process for silver extraction by acidifying calcination and leaching of lead silver slag comprises the following steps of: water leaching, that is, leaching the lead silver slag with water to remove and separate soluble zinc sulfates, recovering the leachate, and keeping the leaching residues in reserve; acidifying calcination, that is, adding a mixture of the leaching residues and sulfuric acid into a stirring groove, stirring uniformly, placing the mixture in a fully-closed rotary kiln, slowly cooling to room temperature to obtain calcine in reserve; water washing, that is, putting the calcine after acidifying calcination and water in a leaching groove, heating and stirring, recovering the filtrate, and keeping the filtering residues in reserve; and finally ammonia leaching and silverextraction. The invention adopts processes of fire method preprocessing and wet method leaching, that is, separating zinc sulfate by water leaching, recovering silver by acidifying calcination and ammonia leaching, and returning ammonia leaching residues to system ingredients; valuable components such as silver, zinc, lead and the like are recovered comprehensively; the purposes of effective resource utilization, energy saving, and pollution prevention are reached; optimal technical and economic effect is obtained; and the invention has low implementation cost and reliable technology, has a metal silver leaching rate of up to above 80%, and a metal silver recovery rate of about 72%.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of metallurgical resources, and in particular relates to a process for comprehensive recovery and treatment of lead and silver slag produced in the wet leaching process of zinc concentrate, that is, a new process for extracting silver by acidification roasting leaching. Background technique [0002] At present, a large amount of lead and silver slag produced in the zinc hydrometallurgy process generally contains scattered metals, precious metals and other valuable metals. The recovery processes for these metals are generally divided into two types: direct method and indirect method. The direct method uses lead and silver slag as the main raw material, and selects an appropriate process to recover the valuable metals in the slag. The indirect method is to add lead and silver slag to lead concentrate in the form of batching, and recover it in the lead smelting system. The specific instructi...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/04C22B3/14C22B1/06
CPCY02P10/20
Inventor 马进何国才纪武仁易超薛莹莹鲁兴武马爱军程亮
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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