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A method for recovering zinc from zinc ferrite resources using magnetization roasting-ammonia leaching

A technology of magnetization roasting and zinc ferrite, which is applied in the field of zinc recovery, can solve the problems that there is no clean and efficient utilization method for recovery and utilization of zinc, that it cannot be effectively recycled, and that the utilization rate is less than 5%. Fast speed and good effect

Active Publication Date: 2020-02-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondary zinc resources mainly include iron and steel plant dust, zinc-containing leaching slag and lead-zinc smelting slag. The annual production of zinc leaching slag in my country is about 5 million tons, but the utilization rate is less than 5%.
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 and iron resources but cannot be effectively recycled, resulting in serious waste of resources and environmental pollution
So far, no clean and efficient utilization method suitable for recycling zinc in zinc ferrite resources has been developed.

Method used

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  • A method for recovering zinc from zinc ferrite resources using magnetization roasting-ammonia leaching

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Effect test

Embodiment 1

[0029] Zinc-containing dust (TZn 5.67%, ZnFe 2 o 4 55.72%), crush the raw ore to -1mm, granulate into small balls of 3-20mm, and carry out magnetization roasting in the rotary kiln to reconstruct the ore phase. The magnetization roasting system is: P(CO) / P( CO+N 2 ) = 25%, the roasting temperature is 750°C, the roasting time is 45min, cooled naturally, crushed to -3mm, and subjected to ammonia leaching treatment. , 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 85.67% after the leaching solution is filtered.

Embodiment 2

[0031] Zinc-containing dust (TZn 5.67%, ZnFe 2 o 4 55.72%), crush the raw ore to -1mm, granulate into small balls of 3-20mm, and carry out magnetization roasting in the rotary kiln to reconstruct the ore phase. The magnetization roasting system is: P(CO) / P( CO+N 2 ) = 20%, the roasting temperature is 800°C, the roasting time is 60min, cooled naturally, crushed to -3mm, and subjected to ammonia leaching treatment. , 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 86.65% after the leaching solution is filtered.

Embodiment 3

[0033] Zinc-containing dust (TZn 5.67%, ZnFe 2 o 4 55.72%), crush the raw ore to -1mm, granulate into small balls of 3-20mm, and carry out magnetization roasting in the rotary kiln to reconstruct the ore phase. The magnetization roasting system is: P(CO) / P( CO+N 2 ) = 25%, the roasting temperature is 750°C, the roasting time is 45min, cooled naturally, crushed to -3mm, and subjected to ammonia leaching treatment. , 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 7mol / L, and the zinc leaching rate is 87.81% after the leaching solution is filtered.

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Abstract

The invention discloses a method for recovering zinc from zinc ferrite resources by using a magnetization roasting-ammonia leaching method, and belongs to the technical field of mineral machining. Themethod comprises the following steps: (1) raw ores are crushed and pelletized to obtain pretreated zinc ferrite resources; (2) the pretreated zinc ferrite resources are magnetized and roasted under areducing atmosphere to finish conversion of zinc ferrite to zinc oxide and magnetite phases, and are cooled to obtain magnetization roasting products; and (3) the magnetization roasting products arecrushed for ammonia leaching to dissolve and leach zinc oxide for solid-liquid separation to obtain zinc filtrate and leaching slag. The zinc ferrite resources are used as raw materials; zinc is extracted by adopting the magnetization roasting-ammonia leaching method; compared with zinc ferrite, zinc oxide is simple in structure and easy to treat; through roasting under the reducing atmosphere, zinc ferrite with stable structure is converted to zinc oxide and magnetite; and zinc oxide is selectively dissolved by adopting the ammonia leaching method to realize efficient recovery of zinc and iron resources from the zinc ferrite resources.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and relates to a method for recovering zinc from zinc ferrite resources by using a magnetization roasting-ammonia leaching method. Background technique [0002] Zinc is the third largest non-ferrous metal next to aluminum and copper. It is widely used in all walks of life and has important strategic significance for the country's economic development. At present, the main raw material for zinc smelting is zinc sulfide ore. With the acceleration of my country's modernization construction , its reserves are dwindling, limiting the development of the 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 mainly include iron and steel plant dust, zinc-containing leaching slag, and lead-zinc smelting slag. my country produces about 5 million tons of zinc leaching slag every year, but the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B3/14C22B19/20C22B7/00C22B7/02C22B7/04
CPCC22B1/02C22B3/14C22B7/008C22B7/02C22B7/04C22B19/24Y02P10/20
Inventor 郭宇峰陈凤姜涛邱冠周郑富强王帅杨凌志谭宇佳谢泽强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王峰杨泽世谢鑫
Owner CENT SOUTH UNIV
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