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Process for recycling bismuth from gas sludge to prepare BiOCl (Bismuth Oxychloride)

A gas mud and process technology, applied in the field of solid waste resource utilization, can solve problems such as adverse environmental impacts, achieve the effects of saving treatment costs, realizing secondary utilization, and reducing pollution

Inactive Publication Date: 2013-04-03
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas mud is rich in iron, zinc, bismuth, lead, manganese and other valuable metals, if not properly utilized, it will cause adverse effects on the environment
In addition, the coking production process will produce a large amount of residual ammonia water, and the cold rolling process will produce a large amount of waste acid and waste alkali

Method used

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  • Process for recycling bismuth from gas sludge to prepare BiOCl (Bismuth Oxychloride)

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of technology that reclaims bismuth to prepare BiOCl from gas mud, as figure 1 As shown, the steps are as follows:

[0031] (1) Take 1Kg of blast furnace gas mud, add 5L of residual ammonia water produced by the coking process, and soak for more than 30 minutes to dissolve the NH 3 The complexed impurity elements include Cu, Ag, Ni, Co;

[0032] (2) Add 10g of Mg powder to the above soaking system, replace the ammonium complexes of metal impurity elements that are less active than them, including Cu, Ag, Ni, and Co, into corresponding elemental forms through a replacement reaction, and remove them by filtration;

[0033] (3) Heat slowly to raise the temperature of the system to 120°C and keep it for 50 minutes, so that the magnesium and zinc elements in the system are converted into MgCO under the combined action of ammonium bicarbonate in the coking residual ammonia water 3 Precipitate or ZnCO 3 Precipitated form, removed by filtration;

[0034] (4) Add 3L o...

Embodiment 2

[0038]A kind of technology that reclaims bismuth to prepare BiOCl from gas mud, the steps are as follows:

[0039] (1) Take 1Kg of blast furnace gas mud, add 4L of residual ammonia water produced by the coking process, and soak for 1 hour to dissolve the available and NH 3 The complexed impurity elements include Cu, Ag, Ni, Co;

[0040] (2) Add 6g of Mg powder to the above soaking system, replace the ammonium complexes of metal impurity elements that are less active than them, including Cu, Ag, Ni, and Co, into corresponding elemental forms through displacement reactions, and remove them by filtration;

[0041] (3) Slowly heat to raise the temperature of the system to 100°C and keep it for 30 minutes, so that the magnesium and zinc elements in the system are converted into MgCO under the combined action of ammonium bicarbonate in the coking residual ammonia water 3 Precipitate or ZnCO 3 Precipitated form, removed by filtration;

[0042] (4) Add 2L of waste acid produced by ...

Embodiment 3

[0046] A kind of technology that reclaims bismuth to prepare BiOCl from gas mud, the steps are as follows:

[0047] (1) Take 1Kg of gas mud, add 6L of residual ammonia water produced by the coking process, and fully soak to dissolve the available and NH 3 The complexed impurity elements include Cu, Ag, Ni, Co;

[0048] (2) Add 12g of Mg powder to the above soaking system, replace the ammonium complexes of metal impurity elements that are less active than them, including Cu, Ag, Ni, and Co, into corresponding elemental forms through a replacement reaction, and remove them by filtration;

[0049] (3) Heating, raising the temperature of the system to 100°C and maintaining it for 30 minutes, so that the magnesium and zinc elements in the system are converted into MgCO under the combined action of ammonium bicarbonate in the coking residual ammonia water 3 Precipitate or ZnCO 3 Precipitated form, removed by filtration;

[0050] (4) Add 4L of waste acid produced by the cold rolli...

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Abstract

The invention relates to a process for recycling bismuth from gas sludge to prepare BiOCl (Bismuth Oxychloride). The process comprises the following steps: taking the gas sludge, and soaking in coking residual ammonia wastewater; adding Mg powder into the soaking system, and replacing metal impurity elements having poorer activity than that of the MG powder into corresponding simple substances to be filtered and eliminated; heating so as to convert the magnesium element and the zinc element in the system into MgCO3 or ZnCO3 to be deposited, filtered and eliminated; adding cold rolling waste acid, eliminating the lead element through a PbSO4 deposit form, leaving metal impurity elements which are easy to be dissolved as acid in an ion manner, and leaving the bismuth element in a Bi3+ form; adding cold rolling alkali waste so as to correspondingly deposit and precipitate the metal impurity ions including Fe2+, Fe3+, Mn2+ and Mn4+; adjusting the system pH within 1.5-2.1, carrying out cohydrolysis of C1- and Bi3+ in the system so as to generate BiOCl deposit, and treating the BiOCl deposit so as to obtain the BiOCl. The process is low in cost, and bismuth can be economically recycled from gas sludge to prepare the BiOCl.

Description

technical field [0001] The invention belongs to the field of utilization of solid waste resources, and in particular relates to a process for preparing BiOCl by recovering bismuth from gas mud. Background technique [0002] The national annual production capacity of iron and steel has exceeded 140 million tons, and the annual production of gas and mud in the iron and steel smelting process is as high as 2 million tons. Gas mud is rich in iron, zinc, bismuth, lead, manganese and other valuable metals, if not properly utilized, it will cause adverse effects on the environment. In addition, the coking production process will produce a large amount of residual ammonia water, and the cold rolling process will produce a large amount of waste acid and waste alkali. If these kinds of waste resources can be better utilized, it will play an important role in the utilization of waste resources in the iron and steel industry and environmental protection. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B30/06
Inventor 刘尚超薛改凤刘璞张垒王丽娜吴亮军张楠付本全段建峰
Owner 武汉钢铁有限公司
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