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Method for recycling zinc from zinc ferrite resources utilizing ore phase reconstruction method

A zinc ferrite and resource technology, applied in the field of zinc recovery, can solve the problems of not developing a clean and efficient utilization method for zinc recovery, inability to effectively recover and reuse resources, waste of resources and the like, and achieve easy subsequent separation of zinc and iron and good conversion effect. , The effect of low process energy consumption

Active Publication Date: 2018-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron and steel enterprises produce about 100 million tons of dust every year, and the utilization rate is less than 20%. These dusts contain a large amount of zinc and iron resources but cannot be effectively recycled, causing serious waste of resources and environmental pollution. Therefore, the recycling of secondary zinc resources is of great importance It is of great significance to solve the shortage of raw materials in my country's zinc industry and to protect the environment
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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  • Method for recycling zinc from zinc ferrite resources utilizing ore phase reconstruction method

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Experimental program
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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 roasting, the roasting temperature is 1230°C, the roasting time is 15min, and the calcified roasted product is placed in the P(CO) / P(CO+N 2 ) = 40% reduction atmosphere for reduction roasting, the roasting temperature is 800 ° C, the roasting time is 90min, the reduction roasted product is cooled, crushed to -1mm, zinc and iron are separated by magnetic separation, the magnetic field strength is 0.2T, and the magnetic field is 0.2T. The recovery rate of zinc in the tailings is 95.31%.

Embodiment 2

[0032] 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 2.2:1, mix well and granulate into small balls of 3-20mm, place the mixture in Carry out calcification roasting in a rotary kiln, the roasting temperature is 1250°C, the roasting time is 10min, and the calcification roasting product is placed in P(CO) / P(CO+N 2 ) = 40% reduction atmosphere for reduction roasting, the roasting temperature is 850 ° C, the roasting time is 90min, the reduction roasted product is cooled, crushed to -1mm, zinc and iron are separated by magnetic separation, the magnetic field strength is 0.2T, and the magnetic field is 0.2T. The recovery rate of zinc in the tailings is 96.87%.

Embodiment 3

[0034] Zinc-containing dust (TZn 5.67%, ZnFe 2 o 4 55.72%), crush the raw ore to -1mm, add calcium hydroxide, control the molar ratio of effective CaO content in calcium hydroxide to zinc ferrite to 2.0:1, mix well and granulate into small balls of 3-20mm, Put the mixture in a rotary kiln for calcification roasting, the roasting temperature is 1280°C, the roasting time is 5min, and the calcified roasted product is placed in P(CO) / P(CO+N 2 ) = 45% reduction atmosphere for reduction roasting, the roasting temperature is 850 ° C, the roasting time is 90min, the reduction roasted product is cooled, crushed to -1mm, zinc and iron are separated by magnetic separation, the magnetic field strength is 0.2T, and the magnetic field is 0.2T. The recovery rate of zinc in the tailings is 96.06%.

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Abstract

The invention discloses a method for recycling zinc from zinc ferrite resources utilizing an ore phase reconstruction method and belongs to the technical field of mineral processing. The method comprises the following steps that (1), crushing treatment is performed on raw ore, and the zinc ferrite resources with predetermined fineness are obtained; (2), a calcification agent is added to the zinc ferrite resources, pelletizing is performed after sufficient mixing, mixed materials are subjected to calcification roasting in an oxidizing atmosphere to make the zinc ferrite perform ore phase reconstruction to be converted into zinc oxide and dicalcium ferrite, and calcification roasting products are obtained; (3), the calcification roasting products are subjected to reduction roasting to make the dicalcium ferrite in the calcification roasting products be reduced and converted into magnetite, and reduction roasting products are obtained; (4), crushing treatment is performed on the reductionroasting products, and zinc oxide ore and the magnetite are obtained by magnetic separation. According to the method for recycling zinc from the zinc ferrite resources utilizing the ore phase reconstruction method, by means of calcification roasting, the zinc ferrite resources are made to perform ore phase reconstruction to be converted into zinc oxide, subsequent separation of zinc and iron is facilitated, the adopted calcification agent is cheap and easy to obtain, the reaction rate is fast, and the recovery rate of zinc after magnetic separation is high.

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 mineral phase reconstruction method. Background technique [0002] Zinc is an important strategic basic material, which is widely used. With the acceleration of my country's modernization, the demand for zinc products is increasing. At present, the main raw material for zinc smelting is zinc sulfide ore, and its 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 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 pro...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B5/12C22B19/30C22B19/34
CPCC22B1/02C22B5/12C22B7/001C22B19/30C22B19/34Y02P10/20
Inventor 郭宇峰郑富强姜涛邱冠周陈凤王帅王超杨凌志谢泽强张林林李光辉杨永斌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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