Silver extraction and processing methods

When it comes to silver, everyone must think of silver and silver jewelry in ancient times. So how much do you know about the extraction and processing of silver? Today the author will talk to you about the extraction and processing methods of silver. When it comes to silver Everyone must have thought of silver and silver jewelry in ancient times. So how much do you know about the extraction and processing of silver? Today the author will talk to you about the extraction and processing methods of silver. There are two types of silver extraction: wet method and fire method. 1. Wet method of wet silver extraction includes cyanidation, sulfuric acid leaching, and pulp electrolysis. The cyanidation process requires the properties and composition of the ore and the conditions for cyanidation are similar to those of the gold cyanidation method. Arsenic, antimony, and sulfur are harmful. The precious liquid produced by cyanidation (containing 0.2-1g/l of silver) is generally used for zinc replacement or electrowinning to extract silver. For example, in South Korea’s Popion Silver Mine (ore grade 165g/t), and China’s Shandong Shilipu Silver Mine (ore grade 280-450g/t), the flotation concentrate silver grade has been increased to 0.9% and 0.6%-l.1 respectively. %, the flotation and cyanidation recovery rates are respectively 92% and 98%, and the total yield is 90%. 2. When the silver grade of the mixed acid leaching ore is higher, the silver can be leached directly with sulfuric acid-nitric acid mixed acid, such as the small silver mines commonly distributed in northern Canada. One of the silver ore ore contains about 1000g/t of silver, which is obtained by gravity separation (jigging) Gravity-selected silver concentrates containing 30%-37% of silver are processed separately by flotation to obtain flotation concentrates containing 2%-4% of silver. 3. Pulp electrolysis This is a method invented in China to process the flotation concentrate of multi-metal symbiotic ore. For flotation concentrates containing pb 5%-10%, cu 3%-5%, s 36%, ag 250g/t, au 40g/t, first use sodium chloride solution and concentrate to form a slurry. Direct current electric field is introduced into the stirred electrolytic cell to dissolve lead, silver (dissolution rate 97%-99%) and part of copper, and the process power consumption is 120-250 kwh/t. 2. Pyrometallurgical smelting of silver-containing lead or copper flotation concentrates. During pyroroasting and smelting, the silver and gold are quantitatively enriched in the smelted product—thick lead or copper matte (also called 'copper matte') )in. The copper matte treatment process is relatively simple. The molten copper matte is blown with air or oxygen-enriched air in a converter to convert copper sulfide into blister copper. The gold and silver in the matte are captured in the blister copper, and the blister copper is cast as In anode electrolytic refining, gold and silver are enriched in copper anode slime, and silver, gold and other valuable metals are recovered from it. The extraction and processing methods of silver have been strengthened in my country in terms of comprehensive beneficiation and recovery. Many mines and refineries have attached importance to the recovery of silver. However, in general, there has been no major development in beneficiation technology and equipment, and the recovery rate of silver is not high. Therefore, the price of silver has never been lowered. Previous article: How to check the origin of diamonds article: Can I wear jewelry after pregnancy?