Method for recovering noble metal from gold and silver converter waste magnesium brick

A technology for waste magnesia bricks and precious metals, which is applied in the field of recycling precious metals. It can solve the problems that cannot be directly put into the furnace, affects the recovery rate of gold and silver, and hinders filtration, etc., and achieves the effect of avoiding low concentration ratio of concentrate and simple chemical addition process.

Active Publication Date: 2013-12-18
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has the following problems: 1, when adopting the gravity separation method, equipment such as shaking tables and spiral chutes are generally used to sort according to the difference in proportion between the minerals and the gangue, and the content of magnesium oxide in the concentrate that is sorted out is still low. Accounting for about 45% of the total weight, it cannot be directly put into the furnace, which seriously affects the recovery rate of gold and silver, which is only about 80%
2. Using the sulfuric acid leaching method, the magnesium oxide in the waste magnesia bricks is chemically reacted to form magnesium sulfate and dissolved in the solution. Although the content of magnesium oxide can be significantly reduced, the enrichment of gold and silver is low, and some impurities are difficult to leach, and A large amount of sulfuric acid
In addition, silicate colloids are easy to form during the sulfuric acid leaching process, which is difficult to settle and hinders filtration, which affects the normal recovery of gold and silver.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Grind waste magnesia bricks to prepare powder. The powder with a particle size of ≤0.074mm accounts for 65% of the whole powder. Take the powder and add water to make pulp. The mass concentration of the pulp is 30%; add sulfuric acid 1000g / t to the pulp , stirred for 2 minutes, and added ester reagents as collectors and foaming agents to carry out rough separation of gold and silver. In ester reagents, ethionate and xanthate were mixed in a mass ratio of 1:1. The amount of ester reagents 40g / t, after stirring for 2 minutes, roughing and scraping and soaking for 6 minutes to collect the rough concentrate; the rough concentrate is introduced into the flotation tank of another flotation machine, and water is added to the flotation tank until flotation The working liquid level of the machine is stirred for 2 minutes, and the coarse concentrate is selected; after the selection is scraped and soaked for 4 minutes, the flotation concentrate is collected and selected; the remain...

Embodiment 2

[0040]Grind the waste magnesia bricks to prepare powder. The powder with a particle size of ≤0.074mm accounts for 80% of the whole powder. Take the powder and add water to make pulp. The mass concentration of the pulp is 35%; add sulfuric acid 4000g / t to the pulp , stirred for 6 minutes, and added ester reagents as collectors and foaming agents to carry out rough separation of gold and silver. The ester reagent ethionate and xanthate were mixed in a mass ratio of 1:2, and the dosage was 80g / t. At the same time, 600g / t of butyl xanthate was added to assist gold and silver roughing. After stirring for 3 minutes, the coarse concentrate was collected after roughing and scraping for 20 minutes; the rough concentrate was introduced into the flotation tank of another flotation machine, Add water to the flotation cell to the working liquid level of the flotation machine, stir for 2 minutes, and perform the selection operation on the coarse concentrate; collect and select the flotation ...

Embodiment 3

[0042] Grind the waste magnesia bricks to prepare powder. The powder with a particle size of ≤0.074mm accounts for 70% of the whole powder. Take the powder and add water to make pulp. The mass concentration of the pulp is 33%; add sulfuric acid 2000g / t to the pulp , stirred for 4 minutes, added ester reagents as collectors and foaming agents to carry out rough separation of gold and silver, ester reagents ethionate and xanthate were mixed in a mass ratio of 1:1.5, and the dosage was 60g / t. Add 400g / t of butyl xanthate to assist gold and silver roughing, stir for 2 minutes, and collect rough concentrate after roughing and scraping for 10 minutes; ester reagents; rough concentrate is introduced into the flotation of another flotation machine In the tank selection, add water to the working liquid level of the flotation machine in the flotation tank, stir for 2 minutes, and carry out the selection operation to the coarse concentrate; after selection and scraping for 8 minutes, coll...

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PUM

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Abstract

The invention relates to the technical field of noble metal recovery, in particular to a method for recovering noble metal from a gold and silver converter waste magnesium brick. The method comprises the working procedures of grinding a waste magnesium brick sample, performing flotation, performing gravity concentration on flotation tailings, performing flotation, performing gravity concentration, removing magnesium through hydrochloric acid, and the like. The problems that the concentrate cannot be fed into a furnace because of high magnesium content of the concentrate and the recovery rate is high when a gravity concentration method is singly used are solved; the problems that the concentration ratio of the concentrate is not high, the using amount of sulfuric acid is large, and leaching residue is difficultly filtered when a sulfuric acid leaching process is singly used are also solved. The magnesium oxide in the concentrate can be removed to the greatest degree by the method, the high-quality gold and silver concentrate is obtained, the gold recovery rate is more than 99 percent, the silver recovery rate is more than 98 percent, and the removing rate of magnesium oxide can be up to over 98 percent. The recovery rate is obviously higher than that of the other processes, the processing cost is relatively low, and the method is convenient to industrially popularize and use.

Description

technical field [0001] The invention relates to the technical field of chemical precious metal recovery, in particular to a method for recovering precious metals from gold-silver converter waste magnesia bricks. technical background [0002] At present, gold and silver smelting converters are mostly used in the gold and silver smelting process. The inner cavity of the gold and silver smelting converter is made of magnesia bricks. When in use, the inner cavity of the gold and silver smelting converter is in direct contact with the smelting metal liquid. The phenomenon of liquid metal penetration, magnesia bricks are mixed with precious metals such as gold and silver. During the maintenance of the gold and silver smelting converter, the waste magnesia bricks will be dismantled and replaced, and the precious metals inside the waste magnesia bricks are mainly recovered by gravity separation and sulfuric acid leaching. The above method has the following problems: 1, when adoptin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03D1/00
Inventor 王李鹏胡保栓郭海宁孙运礼柏亚林何海涛李福兰刘宝山刘剑姜永智
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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