Method for recycling silver from jarosite residue

A recovery method and technology of jarosite slag, which is applied in the field of metallurgy, can solve the problems not involved in the extraction of silver from the jarosite slag, and achieve the effects of simple process and required equipment, convenient operation, and reduced silver content

Active Publication Date: 2015-04-22
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, these disclosed methods do not rela...

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  • Method for recycling silver from jarosite residue

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Experimental program
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Effect test

Embodiment 1

[0019] Mix yellow ammonium iron vanadium slag with coal powder with a particle size of 74μm-3mm and lime with a particle size of 74μm-3mm with a grinder and press the balls to obtain mixed spheres with a diameter of less than 5mm, and then put the mixed spheres into a corundum crucible and refill Put it into a vacuum distillation furnace, keep it at 1100°C for 6 hours with a vacuum degree of 20 Pa, break the vacuum when the temperature in the furnace is lower than 100°C after the heat preservation is over, take it out of the vacuum distillation furnace to separate the silver and the reduced slag; among them, the added coal The ratio of the molar amount of powder, the molar amount of lime to the molar amount of silver in the yellow ammonium iron vanadium slag is 1:2:2.

[0020] The silver before and after the treatment of the yellow ammonium iron vanadium slag of the present embodiment is carried out component analysis (composition content is in mass percentage), and its result ...

Embodiment 2

[0025] Mix jarosite slag with coal powder with a particle size of 74μm-3mm and limestone with a particle size of 3μm-50mm with an extruder and press balls to obtain mixed spheres with a diameter of less than 100mm, and then put the mixed spheres into a corundum crucible Then put it into a vacuum distillation furnace, keep it at 1200°C for 1 hour with a vacuum degree of 15Pa, and break the vacuum when the temperature in the furnace is lower than 100°C after the heat preservation is completed, and take out the vacuum distillation furnace to separate the silver and the reduced slag; among them, the The ratio of the molar amount of added coal powder, the molar amount of limestone to the molar amount of silver in the jarosite slag is 1:2:0.1.

Embodiment 3

[0027] Mix yellow ammonium iron vanadium slag with coal powder with a particle size of 74μm-3mm and dolomite with a particle size of 1mm-10mm with a cylinder mixer and press the ball to obtain a mixed sphere with a diameter of less than 50mm, and then put the mixed sphere into the corundum Then put the crucible into a vacuum distillation furnace, keep the temperature at 1100°C for 4 hours with a vacuum degree of 18 Pa, and break the vacuum when the temperature in the furnace is lower than 100°C after the heat preservation, and take out the vacuum distillation furnace to separate the silver and the reduced slag; among them, The ratio of the molar amount of the added coal powder, the molar amount of dolomite to the molar amount of silver in the yellow ammonium iron vanadium slag is 1:10:10.

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Abstract

The invention relates to a method for recycling silver from jarosite residue. The method for recycling silver from the jarosite residue comprises the following steps: mixing the jarosite residue with pulverized coal and a desulphurizing agent, and briquetting, thus obtaining mixed spheres, then putting the mixed spheres into a vacuum distillation furnace, and heating at the temperature of 1100-1300 DEG C, thus silver in the jarosite residue is separated, wherein the molar weight ratio of the added pulverized coal to the desulphurizing agent to silver in jarosite residue is 1 to (2-10) to (0.1-10). The method for recycling silver from the jarosite residue has the advantages that the ratio of the pulverized coal to the desulphurizing agent to the jarosite residue is reasonably controlled, and the separation of silver from jarosite residue under the vacuum condition of 1100-1300 DEG C is realized; besides, the whole technological process is carried out in a vacuum furnace, influences on personnel and environments are slight, the method and the required equipment are simple, safe and controllable and are easy to operate, and silver can be recycled from the jarosite residue effectively.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering silver in ferrite slag. Background technique [0002] Jarosite slag is the iron removal slag produced in the process of zinc hydrometallurgy. During the iron removal process, calcined sand is added to adjust the pH of the solution between 1.0-3.0. The jarosite slag contains lead, zinc, and indium In addition to other substances, it also contains silver and other elements. The silver in the jarosite slag mainly exists in the form of homogeneous phase and silver sulfide. The silver content in the jarosite slag is generally 200-400g / t. [0003] The processing method of silver in the jarosite slag is mainly carried out by flotation at present, and the flotation method mainly uses a flotation agent to float the silver sulfide in the jarosite slag, and the recovery rate of silver is low. The patent "A Comprehensive Recovery Method for Secondary R...

Claims

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Application Information

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IPC IPC(8): C22B11/02C22B7/04
CPCY02P10/20
Inventor 马红周桂海平王耀宁樊鹏斌唐雯聃
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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