Zinc oxide concentrate leaching equipment and leaching manner thereof

Abstract

The invention discloses zinc oxide concentrate leaching equipment and a leaching manner thereof, and relates to the technical field of zinc hydrometallurgy. The leaching equipment comprises combined medium-leaching leaching tanks, a second dense pond, a second-section acid-leaching leaching tank, a third dense pond, a high-temperature and high-acid leaching tank, a first dense pond and a medium-temperature and medium-acid leaching tank. A south row of combined medium-leaching leaching tanks and a north row of combined medium-leaching leaching tanks are included. Six combined medium-leaching leaching tanks are distributed at equal interval in each row of combined medium-leaching leaching tanks. According to the zinc oxide concentrate leaching equipment and the leaching manner thereof, zincoxide concentrates are independently subjected to combined medium leaching, then high-temperature and high-acid leaching after liquid is centralized at a second-section acid leaching section to be subjected to combined acid leaching with the zinc oxide concentrates. Through the technology design, a high-iron solution can be treated in a centralized manner, supernatant quality control is not influenced, slag following path opening is achieved for a large amount of iron during second-section pressing filtration, the iron content of supernatant after liquid is within 100 mg / L, and the produced supernatant after liquid quality meets the purification operation requirement; and the manganese powder consumption is reduced, single consumption of leached manganese powder is greatly reduced and is 56 kg / T.Zn for average, and economic benefits are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of zinc hydrometallurgy, and in particular relates to a zinc oxide concentrate leaching device and a leaching method thereof. Background technique [0002] Hydro zinc smelting is also known as electrolytic deposition zinc smelting. The main production processes of hydro zinc smelting include concentrate roasting, calcine leaching, leachate purification, electrowinning, and cathode zinc casting. In the process of hydro zinc smelting, acid is often used. Solution leaching of ore, iron in minerals often enters the solution in the form of trivalent or divalent ions. Since iron has great harm in subsequent processes such as electrodeposition, iron removal is the most common and important in hydrometallurgical zinc smelting. One process, can be used for zinc sulfate leaching solution iron removal method has three kinds of jarosite method, goethite method and hematite method, electrolysis selects the full wet metho...

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Problems solved by technology

[0002] Zinc hydrometallurgy is also known as electrolytic deposition zinc smelting. The main production processes of hydrometallurgy zinc smelting include concentrate roasting, calcined sand leaching, leachate purification, electrowinning, and cathode zinc melting and casting. In the process of hydrometallurgy zinc smelting, acidic Solution leaching ore, the iron in minerals often enters the solution in the form of trivalent or divalent ions. Since iron is more harmful in subsequent processes such as electrodeposition, iron removal is the most common and important in hydrometallurgy. One process, which can be used for iron removal in zinc sulfate leaching liquid. There are three kinds of jarosite method, goethite method and hematite method. The electrolysis adopts hot acid leaching-jarosite method to treat the leaching residue in the whole wet method. Due to various problems of the fluidized fluidized furnace, the residual sulfur of the roasted ore produced is relatively high, and the residual sulfur of the roasted dust is between 10% and 15%, and the highest reaches more than 20%. During the hot acid leaching process, the sulfide has a strong Reducing, it is easy to convert Fe in the solution 3+ reduced to Fe 2+ , in order to remove the iron ions in the solution, a large amount of oxidant-manganese powder had to be added in the operation process, and the Fe 2+ Oxidized to Fe 3+ , such a redox reaction not only consumes a large amount of manganese powder, but also leads to a high content of manganese ions in the solution, which has a great impact on the electrolysis operation. Economic indicators and economic benefits

[0003] The existing leaching process is combined oxygen and sulfur leaching, such as Figure 4-5 As shown, according to the change of zinc oxide raw ore grade and the reasonable deployment of zinc concentrate calcine, the precipitation of silicon and iron in the solution after high-temperature and high-acid leaching of calcine is combined with zinc oxide leaching, and there is no desiliconization and iron precipitation process , the process has the advantages of short process flow, less consumption of sulfuric acid, and no consumption of neutralizing agent. The disadvantage of the process is that when the iron content in the calcined sand is high, the combined leaching solution often leaks iron, and the supernatant produced The iron content is high, and the quality control is more difficult. During the production process, the average iron content of the leaching supernatant exceeds 200㎎ / L, and the unit consumption of manganese powder is 138㎏ / T.Zn, which seriously exceeds the company's target assessment requirements and industry standards. In order to achieve For the purpose of reducing the unit consumption of manganese powder and stabilizing the quality index, it is necessary to improve the existing technology to solve the above problems

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