Method for dechlorinating flue gas by efficiently leaching zinc-containing minerals and recycling solution

A solution and mineral technology, which is applied in the field of flue gas dechlorination, efficient leaching of zinc-containing minerals and solution recycling, can solve problems such as strong corrosion, corrosion of equipment materials, and difficulty in resource utilization of products

Pending Publication Date: 2021-01-15
YUNNAN MINZU UNIV
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  • Claims
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Problems solved by technology

Chinese patent CN201510192161.X uses excess ammonia water and ammonium sulfate as leaching agents to realize efficient conversion and recovery of zinc in non-ferrous metal zinc smelting fly ash. This invention requires less investment, but the process is complicated
Chinese patent CN201810878693.2 proposes a method for recovering zinc from willemite resources. This method uses ammonia leaching to avoid the formation of silica gel in the leaching process of silicon-containing phases. The energy consumption is low, but the process is long
Chinese patent CN106319565A proposes a method for preparing zinc electrodeposition under an ammonia system, which uses ammonia water to leach zinc oxide ore powder, reduces impurities, flashes deamination to recover ammonia water, and then adds sulfuric acid to convert the zinc ammonium complex solution into sulfuric acid Ammonium solution is electrolyzed with gelatin and other additives to obtain electrolytic zinc. This method has high quality electrolytic zinc, but requires a lot of chemicals and can only leach zinc oxide minerals
Up to now, the dechlorination of related tail gas and flue gas is mainly concentrated in the fields of waste incineration and coal-fired power plant pollutant purification. There are few related technologies and devices in the smelting industry. Rely on the flue gas desulfurization process or add a pre-spray tower to remove chlorine before the traditional desulfurization process, and the slurry containing chloride ions is highly corrosive, which can easily cause corrosion of equipment materials in the plant area and affect the quality of desulfurization by-products
Chinese patent CN201711392572.9 proposes a flue gas defluorination chlorine, zinc oxide desulfurization combined treatment process, the method uses sodium silicate solution to remove fluorine chlorine in the flue gas, zinc oxide flue gas desulfurization, but the products obtained in the defluorination chlorine process are recycled Difficult to use, high energy consumption
Chinese patent CN201821796132.X provides a pre-washing device for flue gas dechlorination, which uses lye as the absorption liquid to obtain high-quality sodium chloride, but the cost of concentration, evaporation and crystallization is high

Method used

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  • Method for dechlorinating flue gas by efficiently leaching zinc-containing minerals and recycling solution

Examples

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Effect test

Embodiment 1

[0065] The ore containing zinc oxide used in this example comes from a company in Yunnan. The main components in the ore are as follows in terms of mass percentage: Zn 30.50%, Fe 4.6%, Pb 2.5%, Ca 2.1%, S 0.4%, K 0.28%, Cu 0.05 %; at 1000mg / m 3 HCl cylinder gas, purity 95% N 2 Cylinder gas, 99% O 2 Precisely prepared by mass flowmeter to simulate flue gas containing hydrogen chloride, where O 2 Volume concentration is 16.5%, HCl concentration is 100mg / m 3 , the flue gas temperature is 55°C.

[0066] A method for efficient leaching of zinc-containing minerals and solution resource utilization for flue gas dechlorination, the specific steps are as follows:

[0067] (1) Using a three-necked Erlenmeyer flask as a wet leaching device for zinc-containing minerals, add 25 mL of ammonia water and 75 mL of water with a mass fraction of 28%, stir magnetically for 5 minutes, and mix evenly to obtain a leaching agent;

[0068] (2) Adding 10 g of zinc oxide-containing ore with an ave...

Embodiment 2

[0074] The ore containing zinc oxide used in this example comes from a company in Yunnan. The main components in the ore are as follows in terms of mass percentage: Zn 54.50%, Fe 3.6%, Pb 4.5%, Ca 0.8%, S 0.4%, K 0.28%, Cu 0.07 %; at 1000mg / m 3 HCl cylinder gas, purity 95% N 2 Cylinder gas, 99% O 2 Precisely prepared by mass flowmeter to simulate flue gas containing hydrogen chloride, where O 2 Volume concentration is 16.5%, HCl concentration is 200mg / m 3 , the flue gas temperature is 55°C.

[0075] A method for efficient leaching of zinc-containing minerals and solution resource utilization for flue gas dechlorination, the specific steps are as follows:

[0076] (1) Use a three-necked Erlenmeyer flask as a zinc-containing mineral wet leaching device, add 50 mL of ammonia water and 50 mL of water with a mass fraction of 28%, stir magnetically for 5 minutes, and mix evenly to obtain a leaching agent;

[0077] (2) Add 20g of zinc oxide-containing ore with an average partic...

Embodiment 3

[0083] The ore containing zinc oxide used in this example comes from a company in Yunnan. The main components in the ore are as follows in terms of mass percentage: Zn 30.50%, Fe 4.6%, Pb 2.5%, Ca 2.1%, S 0.4%, K 0.28%, Cu 0.05 %; at 1000mg / m 3 HCl cylinder gas, purity 95% N 2 Cylinder gas, 99% O 2 Precisely prepared by mass flowmeter to simulate flue gas containing hydrogen chloride, where O 2 Volume concentration is 15.5%, HCl concentration is 300mg / m 3 , the flue gas temperature is 65°C.

[0084] A method for efficient leaching of zinc-containing minerals and solution resource utilization for flue gas dechlorination, the specific steps are as follows:

[0085] (1) Use a three-necked Erlenmeyer flask as a zinc-containing mineral wet leaching device, add 50 mL of ammonia water and 50 mL of water with a mass fraction of 28%, stir magnetically for 5 minutes, and mix evenly to obtain a leaching agent;

[0086] (2) Add 33.3g of zinc oxide-containing ore with an average part...

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Abstract

The invention provides a method for dechlorinating flue gas by efficiently leaching zinc-containing minerals and recycling solution, and relates to the technical field of atmospheric purification andrecycling. The method comprises the following steps: (1) ammonia water is mixed with water to obtain a leaching agent; (2) the leaching agent, zinc-containing minerals and an oxidizing agent are mixed, zinc is leached, and a zinc-ammonia solution is obtained; (3) the zinc-ammonia solution is mixed with zinc powder, and reduction reaction is carried out to obtain a zinc-containing clean solution; (4) neutralization and zinc precipitation is performed on the zinc-containing clean solution to obtain a zinc-precipitated solution; (5) the zinc-precipitated solution is introduced into a dechlorinating tower, and flue gas is dechlorinated to obtain outlet flue gas and a dechlorinating absorption solution; and (6) the dechlorinating absorption solution is returned to the step (1) to prepare the leaching agent. The method has the characteristics of being efficient in resource utilization, economic and environment-friendly and simple in process.

Description

technical field [0001] The invention relates to the technical field of air purification and resource utilization, in particular to a method for efficient leaching of zinc-containing minerals and solution resource utilization for flue gas dechlorination. Background technique [0002] Metal zinc and zinc chemical products occupy an extremely important position in various fields of the national economy. my country is a big country with zinc resources, mainly distributed in Yunnan, Inner Mongolia, Gansu, Guangdong, Hunan, Guangxi and other provinces. According to the state of zinc in minerals, zinc smelting can be divided into pyrometallurgy and hydrometallurgy. Among them, hydrometallurgy is an important way to obtain zinc-containing products. It has high metal recovery rate, good product quality, comprehensive utilization of resources, Low cost and other characteristics can be mainly divided into acid leaching and ammonia leaching methods. The acid leaching process mainly re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/14C22B3/44C22B21/00B01D53/78B01D53/68
CPCC22B3/14C22B3/44C22B21/0015B01D53/78B01D53/68B01D2258/0283Y02P10/20
Inventor 贾丽娟王学谦耿娜陶雷宁平夏福婷王访刘天成高冀芸
Owner YUNNAN MINZU UNIV
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