Method of recycling zinc from zinc ferrite resource by using calcium roasting-ammonia leaching process

A technology of calcification roasting and zinc ferrite, which is applied in the field of zinc recovery, can solve the problems of not developing a method for the clean and efficient utilization of zinc ferrite resources, the utilization rate of less than 20%, and the inability to effectively recover and utilize the zinc ferrite resource. The effect of easy leaching, filtration and separation, fast reaction rate and low leaching cost

Inactive Publication Date: 2018-11-30
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

my country's iron and steel enterprises produce about 100 million tons of dust every year, but the utilization rate is less than 20%. These dusts contain a large amount of zinc resources but cannot be effectively recycled, resulting in serious waste of resources and environmental pollution. Therefore, the recycling of iron and steel plants containing zinc Dust secondary zinc resource is of great significance to solve the shortage of raw materials in my country's zinc industry and environmental protection
So far, no clean and efficient utilization method for zinc ferrite resources has been developed.

Method used

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  • Method of recycling zinc from zinc ferrite resource by using calcium roasting-ammonia leaching process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Zinc-containing dust (TZn 5.67%, ZnFe 2 o 4 55.72%), crush the raw ore to -1mm, add calcium carbonate, control the molar ratio of effective CaO content in calcium carbonate to zinc ferrite to 2.4:1, mix well and granulate into small balls of 3-20mm, mix The material is placed in a rotary kiln for calcification and roasting to complete the reconstruction of mineral phases. The roasting temperature is 1220°C, the roasting time is 120 minutes, cooled naturally, broken to -3mm, and then subjected to ammonia leaching treatment. The ammonia leaching system is: the solid-liquid ratio is 100g / L, the leaching temperature is 40°C, the leaching time is 120min, and the leaching solution is NH 4 Cl-NH 3 ·H 2 O solution (NH 4 Cl and NH 3 ·H 2 The molar concentration ratio of O is 1:1), the total ammonia concentration in the leaching solution is 6mol / L, and the zinc leaching rate is 93.65% after the leaching solution is filtered.

Embodiment 2

[0032] Zinc-containing dust (TZn 5.67%, ZnFe 2 o 4 55.72%), crush the raw ore to -1mm, add calcium carbonate, control the molar ratio of effective CaO content in calcium carbonate to zinc ferrite to 2.4:1, mix well and granulate into small balls of 3-20mm, mix The material is placed in a rotary kiln for calcification and roasting to complete the reconstruction of mineral phases. The roasting temperature is 1240 ° C, the roasting time is 120 minutes, natural cooling, crushed to -3mm, and ammonia leaching treatment. The ammonia leaching system is: the solid-liquid ratio is 120g / L, the leaching temperature is 40°C, the leaching time is 100min, and the leaching solution is NH 4 Cl-NH 3 ·H 2 O solution (NH 4 Cl and NH 3 ·H 2 The molar concentration ratio of O is 1:1), the total ammonia concentration in the leaching solution is 6mol / L, and the zinc leaching rate is 93.31% after the leaching solution is filtered.

Embodiment 3

[0034] Zinc-containing dust (TZn 5.67%, ZnFe 2 o 4 55.72%), crush the raw ore to -1mm, add calcium oxide, control the molar ratio of effective CaO content to zinc ferrite to 2.5:1, mix well and granulate into small balls of 3-20mm, place the mixture in Carry out calcification and roasting in a rotary kiln to complete mineral phase reconstruction. The roasting temperature is 1220°C and the roasting time is 120 minutes. Natural cooling, crushing to -3mm, and ammonia leaching treatment are carried out. The ammonia leaching system is: the solid-to-liquid ratio is 100g / L, The leaching temperature is 60°C, the leaching time is 110min, and the leaching solution is NH 4 Cl-NH 3 ·H 2 O solution (NH 4 Cl and NH 3 ·H 2 The molar concentration ratio of O is 1:1), the total ammonia concentration in the leaching solution is 6mol / L, and the zinc leaching rate is 94.71% after the leaching solution is filtered.

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Abstract

The invention discloses a method of recycling zinc from a zinc ferrite resource by using a calcium roasting-ammonia leaching process, belonging to the technical field of mineral processing. The methodof recycling the zinc from the zinc ferrite resource by using the calcium roasting-ammonia leaching process comprises the following steps of: step (1) crushing raw ores to obtain the zinc ferrite resource with the predetermined fineness; step (2) adding a calcifying agent to the zinc ferrite resource, fully mixing, then pelletizing, and carrying out calcium roasting on the mixture in an oxidizingatmosphere, so that zinc ferrite is subjected to mineral phase reconstruction and is transformed into zinc oxide, thereby obtaining a calcium roasting product; and step (3) crushing the calcium roasting product, dissolving and leaching the zinc oxide by ammonia-leaching treatment, and obtaining zinc filtrate and leached residues after solid-liquid separation. According to the method, the zinc ferrite is subjected to mineral phase reconstruction and is transformed into the zinc oxide by the calcium roasting, and thus, the follow-up ammonia leaching extraction is facilitated; the leaching costis low; the selectivity is good; the calcifying agent adopted is low in cost and easily available; and compared with pyrogenic process carbonization reduction, the method has the advantages that cokeor reducing coal does not need to be added as a reducing agent, the reaction rate is fast, and the zinc leaching rate can reach above 90%.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for recovering zinc from zinc ferrite resources by using a calcification roasting-ammonia leaching method. Background technique [0002] Zinc is an important strategic basic material with a wide range of applications. Its consumption in non-ferrous metals is second only to copper and aluminum. With the acceleration of my country's modernization, the demand for zinc products is increasing day by day. At present, the main raw material for zinc smelting is zinc sulfide ore, whose reserves are decreasing day by day, which limits the development of zinc industry. Recycling zinc oxide ore and secondary zinc resources is an effective way to solve the shortage of zinc raw materials. Secondary zinc resources include zinc leaching Slag, iron and steel plant dust, lead-zinc smelting slag, etc. my country's iron and steel enterprises produce about 100 million...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B19/20C22B19/30
CPCC22B1/02C22B7/001C22B7/008C22B19/24C22B19/30Y02P10/20
Inventor 郭宇峰陈凤姜涛邱冠周谢泽强郑富强王帅杨凌志王超张林林杨永斌李光辉范晓慧黄柱成张元波李骞陈许玲彭志伟甘敏景建发谢鑫杨泽世王峰
Owner CENT SOUTH UNIV
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