Cooperative roasting method for zinc concentrate and iron pyrite

Abstract

The invention discloses a cooperative roasting method for zinc concentrate and iron pyrite. Specifically, the zinc concentrate and the iron pyrite are mixed to be subjected to fluidized bed roasting, and heat preservation is carried out for 30-120 min at the temperature of 500-700 DEG C after the fluidized bed roasting. Oxygen or air is led in the roasting and heat-preservation process. Roasted ore is leached out under the low-acid condition to obtain zinc sulfate leachate, and a zinc sulfate solution is led to the process of the zinc hydrometallurgy technique. According to the cooperative roasting method, the iron pyrite is applied to the fluidized bed roasting process of the zinc concentrate, so that a concerted reaction is carried out to promote oxygenation of the zinc concentrate; sulfur dioxide generated in the concerted reaction process is used for making acid, and concomitant valuable metal in the iron pyrite is recovered in the zinc smelting technique. By means of the method, the oxygenation efficiency of the zinc concentrate is effectively improved, and zinc ferrite is effectively decomposed; corrosion of roasted ore neutral leaching and weak acid leaching equipment is small, and precipitated iron slag generated in zinc hydrometallurgy is eliminated; the technological process is short, operation is simple, and the method is friendly to the environment.

Description

Technical field:

[0001] The invention belongs to the intersection field of metallurgical engineering and environmental engineering, and relates to a method for synergistic roasting of zinc concentrate and pyrite. Background technique:

[0002] In the existing zinc hydrometallurgy, the zinc concentrate is fed into the air for boiling roasting. During the boiling roasting process, most of the zinc sulfide in the zinc concentrate is oxidized to form zinc oxide, part of the zinc sulfide is oxidized to form zinc sulfate, and part of the zinc sulfide is not Oxidation, zinc oxide and zinc sulfate are extracted by weak acid leaching, and unoxidized zinc sulfide is lost in the leach residue.

[0003] Moreover, during the boiling roasting process of zinc concentrate, the associated iron in zinc concentrate reacts with zinc to form zinc ferrite. Zinc ferrite is stable in nature and insoluble in neutral leaching or low acid leaching process. In order to recover this part of zinc, hot a...

Examples

Embodiment 1

[0019] Pyrite and zinc concentrate are mixed evenly in a mass ratio of 1, and pure oxygen is introduced to carry out boiling roasting at 800 ° C. After boiling roasting, the temperature is kept at 650 ° C for 60 minutes to obtain zinc calcined sand. The leaching agent is sulfuric acid content 90g / L, 80℃, liquid-solid ratio is 10 / 1, leaching time is 30min, after leaching is completed, filter and separate to obtain zinc sulfate leaching solution, zinc leaching rate is 90.12%, copper content in zinc sulfate leaching solution is 0.8g / L, iron content It is 0.04g / L. Table 1 shows the contents of zinc sulfide and zinc ferrite in the zinc calcine obtained in the present invention and the traditional zinc smelting zinc calcine.

[0020] Table 1 Zinc sulfide and zinc ferrite content in zinc calcine

[0021] condition

[0022] There is pyrite

Embodiment 2

[0024] Pyrite and zinc concentrate are mixed evenly in a mass ratio of 2, and pure oxygen is introduced to carry out boiling roasting at 900 °C. After boiling roasting, the temperature is kept at 620 °C for 60 minutes, and the obtained calcined sand is leached at 80 °C. The sulfuric acid content of the leaching solution is 90g / L, the liquid-solid ratio is 10 / 1, and the leaching time is 30min. After the leaching is completed, the zinc sulfate leaching solution is obtained by filtering and separating. The zinc leaching rate is 89.12%. The copper content in the zinc sulfate leaching solution is 0.92g / L, and the iron The content is 0.05g / L. Table 2 shows the contents of zinc sulfide and zinc ferrite in the zinc calcine obtained in the present invention and the traditional zinc smelting zinc calcine.

[0025] Table 2 Zinc sulfide and zinc ferrite content in zinc calcine

[0026] condition

Embodiment 3

[0028] Pyrite and zinc concentrate are mixed evenly in a mass ratio of 2, and pure oxygen is introduced to carry out boiling roasting at 900 °C. After boiling roasting, the temperature is kept at 620 °C for 60 minutes, and the obtained calcined sand is leached at 25 °C. The sulfuric acid content of the leaching solution is 90g / L, the liquid-solid ratio is 10 / 1, and the leaching time is 30min. After the leaching is completed, the zinc sulfate leaching solution is obtained by filtration and separation. The zinc leaching rate is 89.45%, and the copper content in the zinc sulfate leaching solution is 0.95g / L. The content is 0.015g / L.

Technical field:

[0001] The invention belongs to the intersection field of metallurgical engineering and environmental engineering, and relates to a method for synergistic roasting of zinc concentrate and pyrite. Background technique:

[0002] In the existing zinc hydrometallurgy, the zinc concentrate is fed into the air for boiling roasting. During the boiling roasting process, most of the zinc sulfide in the zinc concentrate is oxidized to form zinc oxide, part of the zinc sulfide is oxidized to form zinc sulfate, and part of the zinc sulfide is not Oxidation, zinc oxide and zinc sulfate are extracted by weak acid leaching, and unoxidized zinc sulfide is lost in the leach residue.

[0003] Moreover, during the boiling roasting process of zinc concentrate, the associated iron in zinc concentrate reacts with zinc to form zinc ferrite. Zinc ferrite is stable in nature and insoluble in neutral leaching or low acid leaching process. In order to recover this part of zinc, hot a...

Examples

Embodiment 1

[0019] Pyrite and zinc concentrate are mixed evenly in a mass ratio of 1, and pure oxygen is introduced to carry out boiling roasting at 800 ° C. After boiling roasting, the temperature is kept at 650 ° C for 60 minutes to obtain zinc calcined sand. The leaching agent is sulfuric acid content 90g / L, 80℃, liquid-solid ratio is 10 / 1, leaching time is 30min, after leaching is completed, filter and separate to obtain zinc sulfate leaching solution, zinc leaching rate is 90.12%, copper content in zinc sulfate leaching solution is 0.8g / L, iron content It is 0.04g / L. Table 1 shows the contents of zinc sulfide and zinc ferrite in the zinc calcine obtained in the present invention and the traditional zinc smelting zinc calcine.

[0020] Table 1 Zinc sulfide and zinc ferrite content in zinc calcine

[0021] condition

[0022] There is pyrite

Embodiment 2

[0024] Pyrite and zinc concentrate are mixed evenly in a mass ratio of 2, and pure oxygen is introduced to carry out boiling roasting at 900 °C. After boiling roasting, the temperature is kept at 620 °C for 60 minutes, and the obtained calcined sand is leached at 80 °C. The sulfuric acid content of the leaching solution is 90g / L, the liquid-solid ratio is 10 / 1, and the leaching time is 30min. After the leaching is completed, the zinc sulfate leaching solution is obtained by filtering and separating. The zinc leaching rate is 89.12%. The copper content in the zinc sulfate leaching solution is 0.92g / L, and the iron The content is 0.05g / L. Table 2 shows the contents of zinc sulfide and zinc ferrite in the zinc calcine obtained in the present invention and the traditional zinc smelting zinc calcine.

[0025] Table 2 Zinc sulfide and zinc ferrite content in zinc calcine

[0026] condition

Embodiment 3

[0028] Pyrite and zinc concentrate are mixed evenly in a mass ratio of 2, and pure oxygen is introduced to carry out boiling roasting at 900 °C. After boiling roasting, the temperature is kept at 620 °C for 60 minutes, and the obtained calcined sand is leached at 25 °C. The sulfuric acid content of the leaching solution is 90g / L, the liquid-solid ratio is 10 / 1, and the leaching time is 30min. After the leaching is completed, the zinc sulfate leaching solution is obtained by filtration and separation. The zinc leaching rate is 89.45%, and the copper content in the zinc sulfate leaching solution is 0.95g / L. The content is 0.015g / L.

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