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Method for recycling iron ore concentrate in copper slag floating copper tailings through microwave low-temperature reduction roasting

A technology for recovering copper and iron concentrates, applied in chemical instruments and methods, flotation, magnetic separation, etc., can solve the problems of secondary pollution and high temperature energy consumption in the leaching process, and achieve the realization of ore phase resource reconstruction and reduction The effect of reducing temperature and high economic efficiency

Active Publication Date: 2021-06-11
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems of high temperature energy consumption and secondary pollution easily caused by leaching process when recycling iron in copper slag in the prior art, the present invention provides A method for recovering iron concentrate in copper slag floating copper tailings by microwave low-temperature reduction roasting

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  • Method for recycling iron ore concentrate in copper slag floating copper tailings through microwave low-temperature reduction roasting
  • Method for recycling iron ore concentrate in copper slag floating copper tailings through microwave low-temperature reduction roasting

Examples

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Embodiment 1

[0057] Such as figure 1 , 2 As shown, a method of microwave low-temperature reduction roasting of the present embodiment reclaims iron ore concentrate in copper slag floating copper tailings, comprising the following steps:

[0058] Step 1. Microwave pretreatment

[0059] Accounted for 5% by carbon powder, composite additives (wherein GaO:Na 2 CO 3=1.5) account for 5% of the ratio and take by weighing carbon powder, composite additive and copper slag respectively, mix ball mill and put into the crucible evenly, spread one layer of charcoal grains on the surface and send it into the microwave oven, wherein, the addition amount of charcoal grains is reduced 10% of the total amount of roasting reactants. The above-mentioned reactants were roasted at 750°C for 90 minutes, and the structure of zinc ferrite and fayalite could be destroyed to a certain extent after the reduction roasting with charcoal.

[0060] Step two, wet magnetic separation

[0061] The pre-roasted copper s...

Embodiment 2

[0065] Such as figure 1 , 2 As shown, a method of microwave low-temperature reduction roasting of the present embodiment reclaims iron ore concentrate in copper slag floating copper tailings, comprising the following steps:

[0066] Step 1. Microwave pretreatment:

[0067] Accounted for 10% by carbon powder, composite additives (wherein GaO:Na 2 CO 3 = 3) Take carbon powder, additives and copper slag respectively in proportion of 10%, put them into the crucible evenly by mixing ball milling, spread a layer of carbon particles on the surface and send them into the microwave oven, wherein the amount of carbon particles added is reduction roasting 12% of the total amount of reactants. The above-mentioned reactants were roasted at 800°C for 80 minutes, and the structure of zinc ferrite and fayalite could be destroyed to a certain extent after carbon reduction roasting.

[0068] Step two, wet magnetic separation:

[0069] The pre-roasted copper slag was pulverized by ball mil...

Embodiment 3

[0073] Such as figure 1 , 2 As shown, a method of microwave low-temperature reduction roasting of the present embodiment reclaims iron ore concentrate in copper slag floating copper tailings, comprising the following steps:

[0074] Step 1. Microwave pretreatment:

[0075] According to account for 15% carbon powder accounts for 15%, composite additive (wherein GaO:Na 2 CO 3 =2) Take by weighing carbon powder, composite additive and copper slag respectively in the ratio of 15%, put into the crucible evenly by mixing and ball milling, spread a layer of carbon grains on the surface and send them into the microwave oven, wherein the amount of carbon grains added is the reduction 14% of the total amount of roasting reactants. The above-mentioned reactant was roasted at 900°C for 60 minutes, and the structure of zinc ferrite and fayalite could be destroyed to a certain extent after reduction roasting with charcoal.

[0076] Step two, wet magnetic separation:

[0077] The pre-r...

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Abstract

The invention discloses a method for recycling iron ore concentrate in copper slag floating copper tailings through microwave low-temperature reduction roasting, and belongs to the technical field of metal element recycling. The method comprises the steps of microwave pretreatment, wet-type low-intensity magnetic separation and reverse flotation. According to the invention, microwave pretreatment is adopted, the catalytic action and selective heating characteristics of microwaves on the reaction are utilized, the composite additives (calcium oxide and sodium carbonate) are adopted to assist the microwaves to conduct weak reduction roasting on the copper slag at the temperature lower than 1000 DEG C, so that the purposes of copper slag resource ore phase reconstruction and catalytic in-situ reduction are achieved, the phase composition in the copper slag is improved, an iron phase in the slag is subjected to a decomposition reaction; and meanwhile, roasting products are treated through magnetic separation and reverse flotation, particularly flotation is assisted by a mixed collecting agent, the iron ore concentrate grade can be further improved, the recovery rate is high, the process is simple, energy consumption is low, and environmental protection is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal element recovery, in particular to a method for recovering iron concentrate in copper slag floating copper tailings by microwave low-temperature reduction roasting. Background technique [0002] With the development of metallurgical technology, mineral resources are facing increasing depletion and depletion, and the recycling of secondary resources has become urgent. Copper slag contains a large amount of copper, iron and a considerable amount of precious metal elements, so the development and utilization of copper slag resources is of great significance and very considerable economic benefits. The iron in the copper slag is mainly distributed in the olivine phase and the magnetic iron oxide phase, while the copper binding form is relatively complex, and it is mainly uniformly dispersed in fine particles. The properties of copper slag are closely related to the properties of copper concentrate, flu...

Claims

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Application Information

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IPC IPC(8): B03D1/018B03D1/14B02C17/00B02C23/08B03C1/30B03D101/02B03D101/04B03D101/06B03D101/00
CPCB03D1/018B03D1/14B03C1/30B02C17/00B02C23/08B03D2201/02B03D2201/04B03D2201/06B03D2201/00Y02P70/10Y02P10/20
Inventor 雷鹰雍超李雨刘瑞杨皓月
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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