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A kind of roasting treatment method of iron tailings

A processing method and technology for iron tailings, which are applied in the field of roasting and processing of iron tailings, can solve the problems of affecting the recovery of flue gas metal, existing additive costs, and high roasting energy consumption, achieving simple operation, avoiding pollution and energy consumption, inhibiting The effect of oxidation

Active Publication Date: 2020-05-05
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbonaceous reducing agents such as carbon powder need to be added during the treatment process. The operation is more complicated and there is an additive cost. The roasting energy consumption is high, and the carbon content in the flue gas will be high, and the process will be polluted, which will affect the metal recovery in the flue gas.

Method used

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  • A kind of roasting treatment method of iron tailings
  • A kind of roasting treatment method of iron tailings
  • A kind of roasting treatment method of iron tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A kind of roasting processing method of iron tailings, the recycling process is as follows figure 1 shown, including the following steps:

[0033] S1. Roasting: Mix 8.5g of iron tailings and 1.5g of chlorinating agent, add 13ml of ultrapure water, dry at 105°C for 15h, and then roast in an inert gas atmosphere, wherein the gas flow rate is 50ml / min, the roasting conditions It is: using program heating and program cooling, first raise the temperature to 600°C at a rate of 5°C / min, then raise the temperature to 800°C at a rate of 3°C / min, and finally raise the temperature to 1000°C at a rate of 2°C / min, the cooling rate 5°C / min, the calcination temperature is 1000°C, and the holding time is 60min;

[0034] S2. Recovery: After the roasting temperature mentioned in S1 drops to 120°C, condense the volatilized flue gas to collect part of copper, lead, zinc, and cadmium elements, and magnetically separate the roasted slag to obtain magnetite.

Embodiment 2

[0036] A method for roasting iron tailings, comprising the following steps:

[0037] S1. Roasting: Mix 17g of iron tailings and 3g of chlorinating agent, add 25ml of ultrapure water, dry at 105°C for 35h, and then roast in an inert gas atmosphere, wherein the gas flow rate is 100ml / min, and the roasting conditions are: Using program heating and program cooling, the temperature is first raised to 600°C at a rate of 5°C / min, then to 800°C at a rate of 3°C / min, the cooling rate is 5°C / min, the roasting temperature is 800°C, and the holding time is 60min;

[0038] S2. Recovery: After the roasting temperature mentioned in S1 drops to 120°C, condense the volatilized flue gas to obtain part of copper, lead, zinc, and cadmium elements, and magnetically separate the roasted slag to obtain magnetite.

Embodiment 3

[0040] A method for roasting iron tailings, comprising the following steps:

[0041]S1. Roasting: Mix 17g of iron tailings and 3g of chlorinating agent, add 25ml of ultrapure water, dry at 105°C for 35h, and then roast in an inert gas atmosphere, wherein the gas flow rate is 100ml / min, and the roasting conditions are: Adopt program heating and program cooling, the heating rate is 5°C / min, the cooling rate is 5°C / min, the roasting temperature is 600°C, and the holding time is 60min;

[0042] S2. Recovery: After the roasting temperature mentioned in S1 drops to 120°C, condense the volatilized flue gas to obtain part of copper, lead, zinc, and cadmium elements, and magnetically separate the roasted slag to obtain magnetite.

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Abstract

The invention discloses a roasting treatment method for iron tailings. The method comprises the following steps of 1, roasting, wherein the iron tailings are roasted under the inert gas atmosphere, and program temperature increase and decrease are conducted; 2, recycling, wherein volatilized smoke is recycled to obtain a metal chloride, after the roasting temperature in the first step is decreasedto 50-150 DEG C, roasting residues are taken out and subjected to magnetic separation, and magnetite is obtained. According to the roasting treatment method, by controlling the special inert gas roasting atmosphere, the addition amount of a chlorinating agent and the roasting temperature increase and decrease programs, the iron tailings are magnetized and separated, and the good effects of iron mine magnetization and valuable metal separation are achieved. The removal rate of lead, copper, zinc and cadmium reaches 98.89%, 66.71%, 60.51% and 96.6%, the magnetic separation recycle rate reaches98.29%, and a reduction agent does not need to be added. By controlling the roasting atmosphere, iron in the tailings is magnetized, the problems are fundamentally reduced that in the process of the iron tailing treatment technology, the pollution is large, and recycle of metal in smoke is influenced. The method is easy and convenient to operate and low in coat and has obvious benefits of reduction and recycling of the iron tailings.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of tailings resources, and in particular relates to a method for roasting iron tailings. Background technique [0002] China is the second largest producer of iron ore in the world after Brazil. Iron tailings contain a large amount of elements such as Fe, Cu, Zn, S, etc. A large amount of storage of iron tailings will not only cause a great waste of resources, but also The environment poses great threats and hazards. Environmental responsibility and sustainable development of mineral resources are crucial to the mining industry. Therefore, how to safely dispose and utilize iron tailings is a challenging task for our country. For a long time, iron tailings have been disposed of by stacking and burying, which not only takes up a lot of space, but also increases processing costs and poses a potential threat to the environment. [0003] Patent CN101225468 discloses a method for reclaiming go...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/08
CPCC22B1/08Y02P10/20
Inventor 宁寻安蔡海立路星雯白晓燕
Owner GUANGDONG UNIV OF TECH