Method for extracting valuable elements from jarosite slag

A valuable element and extraction method technology, applied in the field of metallurgy, can solve the problems of difficult utilization of by-product gypsum, low comprehensive utilization, long process, etc., to improve green ball strength and thermal stability, improve fluidity and desulfurization ability. , the effect of reducing the reduction expansion rate

Active Publication Date: 2017-10-20
CENT SOUTH UNIV +1
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  • Application Information

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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 reduction, easy to produce a large amount of powder, resulting in kiln knot
The raw materials directly enter the reduction furnace for reduction, which inevitably leads to excessive sulfur content in the reduced iron powder, which cannot meet the technical requirements of high-quality reduced iron powder, and cannot effectively recycle sulfur; the reduced products are all obtained by grinding-magnetic separation. Reduced iron powder , the quality of reduced iron powder is difficult to guarantee, because in the grinding-magnetic separation iron extraction process, metallic iron is easy to re-oxidize, and the investment is large, the process is long, and the cost is high; all processes are only for one or 2-3 kinds of valuable elements are recycled, and the 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

Method used

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  • Method for extracting valuable elements from jarosite slag
  • Method for extracting valuable elements from jarosite slag
  • Method for extracting valuable elements from jarosite slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0145] The dried alum slag has a water content of 7.2%, and the addition of a multifunctional additive with a mass ratio of 2% (the mass ratio is 15% of blue charcoal powder, 40% of limestone powder, 15% of dolomite powder, 10% of sodium humate dry powder, iron oxide powder 10%, sodium carbonate powder 10%), mix in a strong mixer for 1min (1200-1800rpm), mix in a moist mill (moisture water is 6-8%) for 2min, and then mix in a disc pelletizer Make pellets inside, and prepare green pellets with a particle size of 8-16mm and a water content of 9.5%. The drop strength of green balls is 5.1 times / 0.5m, and the compressive strength of green balls is 15.3N / piece.

[0146] Green pellets are dried at 450°C for 3 minutes, preheated at 650°C for 10 minutes, and oxidized and roasted at 1150°C for 80 minutes on a belt roaster (the height of the material layer is 70-110mm). The residual sulfur content of the roasted pellets is 1.0%, and the desulfurization rate is It reaches 92.2%, and the...

Embodiment 2

[0152] The dried alum slag contains 8.3% water, and the addition of multifunctional additives with a mass ratio of 5% (the mass ratio is 30% of blue charcoal powder, 40% of limestone powder, 15% of dolomite powder, 5% of sodium humate dry powder, iron oxide powder 5%, sodium carbonate powder 5%), mix in a strong mixer for 1min (1200-1800rpm), mix in a moist mill (moisture water is 6-8%) for 2min, mix well, and then Pelletizing is carried out in the disc pelletizer to prepare green pellets with a particle size of 8-16mm and a water content of 10.5%. The drop strength of green balls is 5.6 times / 0.5m, and the compressive strength of green balls is 16.0N / piece.

[0153] Green pellets are dried at 350°C for 5 minutes, preheated at 850°C for 8 minutes and oxidized and roasted at 1200°C for 60 minutes on a belt roaster (the height of the material layer is 70-110mm). The residual sulfur content of the roasted pellets is 0.63%, and the desulfurization rate is It reaches 96.2%, and th...

Embodiment 3

[0159] The dried alumina slag has a water content of 9.0%, and the alumina slag is added with a mass ratio of 7% multifunctional additives (the mass ratio is 15% of blue charcoal powder, 40% of limestone powder, 15% of dolomite powder, and 10% of sodium humate dry powder , iron oxide powder 10%, sodium carbonate powder 10%), mix in a strong mixer for 1min (1200-1800rpm), mix in a moist mill (moisture water is 6-8%) for 2min, fully mix, Then pelletize in a disc pelletizer to prepare green pellets with a particle size of 8-16 mm and a water content of 12.0%. The drop strength of green balls is 7.3 times / 0.5m, and the compressive strength of green balls is 15.0N / piece.

[0160] Green pellets are dried at 250°C for 6 minutes, preheated at 1100°C for 9 minutes and oxidized and roasted at 1300°C for 20 minutes on a belt roaster (the height of the material layer is 70-110mm). The residual sulfur content of the roasted pellets is 0.56%, and the desulfurization rate is It reaches 98.3...

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Abstract

The invention discloses a method for extracting valuable elements from jarosite slag. The method specially includes the steps of pelletization, oxidation roasting desulfurization, direct reduction, smelting separation, ingot casting, electrolysis and the like. A special additive agent disclosed by the invention is adopted in the pelletization process, and the additive agent comprises an organic binder, an alkaline earth metal source, an alkaline metal source, carbonaceous fuel and iron oxide. By the adoption of the method, by means of extensive research and test certification, the additive agent is used so that pelletization can be enhanced, the roasting desulfurization and consolidation effect of pellets is improved, the strength of the roasted pellets is enhanced, the reducibility of the roasted pellets is improved, the reduction swelling rate of the pellets is lowered, the mobility of the slag is improved, desulfurization capacity of the slag is also improved, and the subsequent process is matched to achieve efficient separation and extraction of the various valuable elements like iron, gallium, zinc, indium and sulfur.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering various valuable elements such as zinc, indium, iron, gallium, sulfur and the like 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/248C22B1/244C22B5/10C22B19/30C22B58/00C25C5/02
CPCC22B1/02C22B1/2406C22B1/244C22B1/248C22B5/10C22B19/30C22B58/00C25C5/02Y02P10/20
Inventor 朱德庆徐五七潘建李启厚俞鹰钱俊杰薛钰霄陈锦安虎训李紫云梁钟仁
Owner CENT SOUTH UNIV
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