Method for recycling zinc, indium, iron and gallium from iron vanadium slag

Abstract

The invention discloses a method for recycling zinc, indium, iron and gallium from iron vanadium slag. The method specifically comprises the steps of uniform mixing of an additive with the iron vanadium slag, grinding, pelletizing, oxidized roasting desulfurization, direct reduction, melt separation and the like. In the pelletizing process, the special additive is adopted, and the additive comprises an organic binding agent, an alkali earth metal source, an alkali metal source, carbonaceous fuel and ferric oxide. It is verified through a great number of researches and tests that, through the additive, the pellet roasting desulfurization and solidification effects can be enhanced and improved, the roasted pellet strength is improved, the roasted pellet reducibility is improved, the pellet reduction expansion rate is lowered, and a qualified furnace material is provided for pyrogenic-process efficient separation and extraction of multiple types of valuable elements, such as, the iron, gallium, zinc, indium and sulphur.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for efficiently recovering valuable elements such as zinc, indium, iron, gallium, sulfur, etc. from ferrite slag. Background technique [0002] Alumite slag is the waste produced for iron removal in the process of wet zinc extraction, containing 25%-30% iron, 8-12% sulfur, 3%-5% zinc, 50-100g / t silver and a small amount of scattered Metal gallium, indium, germanium and other elements have high utilization value. Because it contains heavy metals and contains 30-50% water, it is relatively unstable and difficult to stockpile. It is a dangerous solid waste, so it must be treated. [0003] The fire extraction process is a promising high-efficiency process. There are many varieties of valuable elements extracted, high extraction efficiency, less waste water, and the secondary slag can be harmless and resource-based. [0004] Reduction roasting-melting is an e...

AI Technical Summary

Problems solved by technology

However, there is no recycling of other valuable elements such as iron, gallium, indium, etc.

[0012] To sum up, in the disclosed pyrotechnic patents or patent applications related to the utilization of iron-vanadium slag, they all combine iron-vanadium slag with other smelting slag and reducing agents or desulfurizers for granulation or compaction. , the binders used are quicklime, hydrated lime, cement, bentonite, starch water solubles, glue, syrup, asphalt, etc., without considering the dispersion of the binder and the mixing effect of the mixture, and most of them are raw agglomerates directly entering the high-temperature smelting furnace for reduction, there is no pre-high-temperature roasting desulfurization and consolidation process, it is easy to produce a large amount of powder, resulting in kiln formation

The raw materials are directly put into the reduction furnace for reduction, and the desulfurization effect is poor during the reduction process, which leads to low zinc volatilization rate, and inevitably leads to a serious excess of sulfur content in the reduced iron powder, which cannot meet the technical requirements of high-quality reduced iron powder, and cannot be effectively recycled. Sulfur; the reduced products are obtained through grinding-magnetic separation to obtain reduced iron powder. The quality of reduced iron powder is difficult to guarantee, because in the process of grinding-magnetic separation iron extraction, metallic iron is easy to re-oxidize, and the investment is large and the process is long. High cost; all processes only recycle one or 2-3 valuable elements in the iron slag, and the degree of comprehensive utilization is low, especially the recycling of rare elements indium and gallium is rarely involved

There are only two disclosed technical solutions for desulfurization of sulfur-containing flue gas. One is to use the lime-gypsum method, but the by-product gypsum is difficult to use; the other is to use low-concentration SO 2 The flue gas is returned to the nearby acid plant to produce sulfuric acid, and the flexibility and adaptability of the process are poor

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