Method for recycling waste slag of zinc smelting plant

A closed-circuit circulation and zinc smelting technology, which is applied in the direction of improving process efficiency, can solve problems such as difficult disposal of zinc ferrite slag and sulfur slag, environmental pollution, etc., achieve high suspension reduction efficiency, low-temperature operation of production efficiency, and reduce transportation risks Effect

Inactive Publication Date: 2019-04-05
河套学院 +1
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the difficult problems of zinc ferrite slag and sulfur slag produced in the current hydrometallurgy process and environmental pollution problems mentioned in the background technology, and provide a method for closed-circuit recycling of waste slag in zinc smelters , in order to realize the synergistic treatment and recycling of zinc ferrite slag and sulfur slag

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  • Method for recycling waste slag of zinc smelting plant

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Embodiment 1

[0045] This embodiment provides a method for closed-circuit recycling of waste slag in a zinc smelter. The process flow chart is as attached figure 1 As shown, it specifically includes the following steps:

[0046] S1. Put the zinc ferrite slag in a drying kiln and dry at 80°C for 10 hours to obtain dry zinc ferrite slag. Weigh 2000g of the above-mentioned zinc ferrite slag and 200g of coke powder after drying, mix them and activate them by ball milling 2h. The ball milling speed is 50rpm, so that all the materials pass through the 150μm screen and put into the suspension reactor;

[0047] S2. Open the heating furnace, put the sulfur slag into the heating furnace, raise the temperature of the heating furnace to 800°C and keep it unchanged to obtain sulfur vapor, then open the nitrogen valve, feed nitrogen to mix the carrier gas (sulfur vapor), and blow in Suspension reaction tower; make the concentration of sulfur in the mixed gas reach about 35%, and adjust the mixed gas to ...

Embodiment 2

[0053] This embodiment provides a method for closed-circuit recycling of waste slag in a zinc smelter. The process flow chart is as attached figure 1 As shown, it specifically includes the following steps:

[0054] S1. Put the zinc ferrite slag in a drying kiln and dry at 100°C for 10 hours to obtain dry zinc ferrite slag. Weigh 2000g of the above-mentioned zinc ferrite slag and 250g of coke powder after drying, mix them and activate them by ball milling 3h. The ball milling speed is 30rpm, so that all the materials pass through the 74μm screen and put into the suspension reactor;

[0055] S2. Open the heating furnace, put the sulfur slag into the heating furnace, raise the temperature of the heating furnace to 600°C and keep it unchanged to obtain sulfur vapor, then open the nitrogen valve, feed nitrogen to mix the carrier gas (sulfur vapor), and blow in Suspension reaction tower; make the concentration of sulfur in the mixed gas reach about 25%, and adjust the mixed gas to ...

Embodiment 3

[0061] This embodiment provides a method for closed-circuit recycling of waste slag in a zinc smelter. The process flow chart is as attached figure 1 As shown, it specifically includes the following steps:

[0062] S1. Put the zinc ferrite slag into a drying kiln and dry at 140°C for 3 hours to obtain dry zinc ferrite slag. Weigh 2000g of the dried zinc ferrite slag and 100g of coke powder and mix them to activate by ball milling. 4h, the ball milling speed is 20rpm, so that all the materials pass through the 58μm screen and put into the suspension reactor;

[0063] S2. Open the heating furnace, put the sulfur slag into the heating furnace, raise the temperature of the heating furnace to 900°C and keep it unchanged to obtain sulfur vapor, then open the nitrogen valve, feed nitrogen to mix the carrier gas (sulfur vapor), and blow in Suspension reaction tower; make the concentration of sulfur in the mixed gas reach about 50%, and adjust the mixed gas to blow into the suspension...

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Abstract

The invention belongs to the field of mineral processing and nonferrous metal smelting, and particularly discloses a method for recycling waste slag of a zinc smelting plant. According to the method,zinc ferrite slag produced in a zinc hydrometallurgy process is used as a raw material, a carbonaceous reducing agent is added, sulfur slag produced by adopting a zinc direct leaching process is usedas a vulcanizing agent, reducing and vulcanizing are carried out at the temperature of 400-1000 DEG C in a fluidized bed, zinc sulfide and ferric oxide are obtained through reaction, tail gas is subjected to dust collecting and separation to obtain soot and tail gas, and a roasted product is subjected to beneficiation to obtain zinc sulfide ore concentrate and iron oxide ore. According to the method for recycling the waste slag of the zinc smelting plant, cooperative treatment and on-site resource recycling of the industrial solid waste are realized, pollution of the environment and waste of resources are avoided, and full utilization of the waste is completed. Meanwhile, the zinc ferrite slag is reduced and vulcanized to the zinc sulfide and the iron oxide by utilizing the high-efficiencyproperty of the suspension reaction, so that the advantages that the production efficiency is high, the low-temperature operation is achieved, products are easy to separate, the cooperative treatmentof the industrial solid waste and internal circulation of a plant area are achieved, and the logistics cost and the transportation risk are reduced are realized.

Description

technical field [0001] The invention belongs to the fields of mineral processing and non-ferrous metal metallurgical engineering, and more specifically relates to a method for closed-circuit recycling of waste slag in a zinc smelter. Background technique [0002] More than 80% of metal zinc in the world is produced by wet process, and the main processes of hydrometallurgy include oxidation roasting-leaching-electrowinning and direct leaching process without roasting. Zinc ferrite is the main by-product of the zinc hydrometallurgy process. Its structure is stable. It is difficult to dissolve zinc ferrite by conventional neutral leaching and low-acid leaching. The output of zinc per ton can reach 5-30% of the zinc output. Contains harmful heavy metals, which are currently stockpiled in large quantities, occupying valuable land resources, and causing waste of metal resources and environmental pollution. At the same time, the advanced direct leaching process has been adopted by...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B19/30C22B19/20
CPCC22B7/002C22B19/20C22B19/30Y02P10/20
Inventor 王岳俊陈永明郭伟宋娜余靖冉
Owner 河套学院
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