Method for extracting valuable metals from low-nickel matte converter slag

Abstract

The invention discloses a method for extracting valuable metals from low-nickel matte converter slag. According to the method for extracting the valuable metals from the low-nickel matte converter slag, the low-nickel matte converter slag is mixed with quicklime and roasted to obtain a roasted material, the roasted material is ground and magnetically separated to obtain silicate and iron-rich slag, a strong alkali solution is added into the iron-rich slag for soaking treatment, solid-liquid separation is carried out to obtain filtrate and filter residues, the filter residues are mixed with acid liquor, oxygen pressure acid leaching is carried out, solid-liquid separation is carried out to obtain leachate and iron oxide red, hydrogen sulfide gas is introduced into the leachate, the pH value is adjusted, and solid-liquid separation is carried out to obtain copper sulfide precipitate and nickel-cobalt-containing filtrate. According to the method for extracting the valuable metals from the low-nickel matte converter slag, silicon dioxide is removed through roasting to prepare silicate, then iron oxide red is prepared through acid leaching, and finally the leachate is subjected to metal separation, so that various components in the converter slag are fully utilized; and the technological process is short, each component of the low-nickel matte converter slag is effectively utilized, waste is turned into wealth, and loss of valuable metal elements is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for extracting valuable metals from low-nickel matte converter slag. Background technique [0002] Low nickel matte is an intermediate product of matte smelting in the traditional pyrometallurgy process. The main constituent phases of low nickel matte are some sulfides and their sulfide solid solutions, such as Ni 3 S 2 、Cu 2 S, (Fe,Ni) 9 S 8 etc., is a substance with a relatively complex composition. [0003] In the traditional nickel production process, the nickel concentrate is first dried and smelted to produce low-nickel matte. Because the composition of the low-nickel matte obtained by matte-making smelting is not enough to meet the processing requirements of the refining process, it needs to be further blown To form high-nickel matte to remove iron and part of sulfur, the iron in it needs to be blown to less than 4% to obtain high-nickel matte ...

AI Technical Summary

Problems solved by technology

[0004] In the process of blowing low nickel matte into high nickel matte, the temperature of the converter needs to reach 1200-1300°C, and the blowing time is as long as 8-10 hours. Most of Co and some Ni and Cu will be oxidized together with iron to form converter slag, resulting in waste of resources

[0005] In order to recover the cobalt and other valuable metals, in the traditional pyro-matte making process of sulfide ore, when converting low nickel matte into high nickel matte, there are usually two ways to recover the converter slag: one is to convert the obtained converter slag into Continue to enter the depleted electric furnace and repeatedly smelt to enrich the valuable metals in the high nickel matte. In the process of nickel electrolytic refining, they enter the anolyte together with the nickel. However, the cobalt in the valuable metals is enriched in the high nickel matte. The loss is about 50%, and the whole process causes repeated circulation of materials, repeated consumption of energy, and serious environmental pollution

The other is to reduce the converter slag to obtain cobalt matte or cobalt alloy by reduction smelting or reduction vulcanization smelting, and then carry out separate wet treatment. This method has complex parameters, high reaction temperature and high energy consumption.

Images