Method for extracting manganese and silverfrom oxidized manganese- silverores

Abstract

The invention discloses a method for extracting manganese and silver from oxidized manganese- silver ores, which comprises the following steps: (1) crushing and coarse grinding the manganese- silver ores into manganese- silver powdered ores; (2) obtaining manganese-silver rough and fine ores and dry magnetic separation tailings through dry magnetic separation; (3) grinding the ores in wet-type to obtain manganese-silver rough and fine powdered ores; (4) obtaining manganese-silver fine powered ores and wet-type magnetic separation tailings through wet-type magnetic separation; (5) separating and extracting manganese and argentums; after the manganese-silver fine powered ores are pressed and prepared to be manganese-silver fine brick ores for baking, leaching is performed by taking a saturated sodium chloride solution as a leaching agent for argentums, so that a argentums-bearing leach solution and manganese fine brick ores are obtained; a saturated sodium sulphide solution is added into the leach solution for complete reaction so as to convert silver ions into silver sulfide and separated silver sulfide out; the dry magnetic separation tailings and the wet-type magnetic separation tailings are mixed and pressed, and sintered to be brick tailings. According to the invention, (1) manganese and silver in the oxidized manganese- silver ores are gathered through magnetic separation, the separation cost is low and the separation efficiency is high; (2) the sodium chloride solution is used as the leaching agent to leach silver, so that the silver leaching efficiency is higher, the leaching agent can be reused, and the production cost is lowered at the same time; and (3) the tailings are made into the brick tailings, so that no solid waste is generated, and comprehensive utilization on resources is realized.

Description

technical field [0001] The invention belongs to the technical field of methods for sorting complex mixed minerals and resource comprehensive utilization in the field of mineral processing, and in particular relates to a method for extracting manganese and silver from oxidized manganese-silver ore while using tailings to make bricks. Background technique [0002] Silver-containing manganese ore is usually called manganese-silver ore, which is one of the important types of silver ore resources. The proven silver reserves of manganese-silver ore in my country have reached nearly 10,000 tons, and have been discovered successively in Inner Mongolia, Hunan, Hebei, Fujian, Guangxi and other places Manganese-bearing silver deposits. According to the type of manganese minerals contained, manganese silver ore can be divided into oxidation type, sulfide type, carbonate type and hydroxide type. Among them, oxidized manganese silver ore is the main silver-containing type that has been pro...

AI Technical Summary

Problems solved by technology

The characteristic of the silver extraction process by the chlorination roasting method is to destroy the crystal structure of manganese minerals and other silver-containing minerals through roasting, so that the silver is converted into silver chloride that is easy to leach. The advantage of this process is that the production process and equipment are relatively simple. The mine has strong adaptability, but its disadvantage is that the flue gas needs to be treated and discharged after roasting; the wet silver extraction process includes cyanide method, pyrite acid leaching method, sulfur dioxide, sulfite reduction leaching method, etc. Among them, cyanide leaching The silver process is relatively mature, the process is simple, and the leaching effect is good. However, because cyanide is a highly toxic compound, it is easy to pose a threat to the environment. New enterprises or small-scale enterprises are no longer allowed to use this process.

Images