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System and method for treating lead and zinc smelting slag

A technology for smelting slag and lead and zinc, which is applied in the field of systems for processing lead-zinc smelting slag, can solve the problems of increasing processing procedures and costs, failing to effectively separate zinc and lead, and being unable to handle iron-containing slag, thereby achieving the effect of low energy consumption

Inactive Publication Date: 2017-09-12
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are following problems: the obtained products are mostly secondary dust and iron-containing waste slag containing zinc and lead oxides, or low-grade metal zinc, lead and molten iron; Secondary dust by-products are used as raw materials for zinc or lead smelting; the treated zinc and lead have not been effectively separated, and to utilize zinc and lead resources, the secondary dust must be reprocessed to separate zinc and lead, which greatly increases Processing procedures and costs
At present, it is still impossible to deal with lead-zinc smelting slag with low iron content and high lead content at home and abroad, and there is no report of one-time separation of zinc and lead

Method used

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  • System and method for treating lead and zinc smelting slag
  • System and method for treating lead and zinc smelting slag
  • System and method for treating lead and zinc smelting slag

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Effect test

Embodiment 1

[0066] In this embodiment, the composition of the lead-zinc smelting slag is: total iron content 25.22wt%, lead content 3.25wt%, zinc content 4.55wt%. Lead-zinc smelting slag, calcium chloride, coke powder, and bentonite are mixed and pelletized according to the mass ratio of 100:10:15:5, and the obtained green pellets are dried until the water content is ≤2wt%, and sent to the chlorination roaster . Among them, the temperature of the lead-zinc chlorination zone is 500°C±15°C, the temperature of the zinc chloride volatilization zone is 850°C±10°C, and the temperature of the lead chloride volatilization zone is 1000°C±15°C. After chlorination and volatilization, the obtained zinc chloride dust volatilizes into the first flue, and the volatilization rate of zinc reaches 97.62%, and the obtained lead chloride dust volatilizes into the second flue, and the volatilization rate of lead reaches 96.26%. The iron-containing pellets after the volatilization of lead-zinc chlorides enter...

Embodiment 2

[0068] In this embodiment, the composition of the lead-zinc smelting slag is: total iron content 22wt%, lead content 4wt%, zinc content 17wt%. Lead-zinc smelting slag, calcium chloride, semi-coke, and bentonite are mixed and pelletized according to the mass ratio of 100:25:5:10, and the obtained green pellets are dried until the water content is ≤2wt%, and sent to the chlorination roaster . Among them, the temperature of the lead-zinc chlorination zone is 550°C±15°C, the temperature of the zinc chloride volatilization zone is 850°C±10°C, and the temperature of the lead chloride volatilization zone is 1050°C±15°C. After chlorination and volatilization, the obtained zinc chloride dust volatilizes into the first flue, and the volatilization rate of zinc reaches 98.05%, and the obtained lead chloride dust volatilizes into the second flue, and the volatilization rate of lead reaches 97.03%. The iron-containing pellets after the volatilization of lead-zinc chlorides enter the iron ...

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Abstract

The invention relates to a system and method for treating lead and zinc smelting slag. In the system, a material mixing machine is provided with a lead and zinc smelting slag inlet, a chlorinating agent inlet, a reducing agent inlet, a bonding agent inlet and a mixture outlet. A balling machine is provided with a mixture inlet and a green ball outlet. The mixture inlet is connected with the mixture outlet. A chlorination roasting furnace is in a step type and comprises a feeding area, a lead-zinc chlorination area, a zinc chloride volatilization area, a lead chloride volatilization area, an iron reducing area and a discharging area which are sequentially lowered in horizontal height. A conveying device is arranged in each area. Baffles are arranged between the areas, closed space is formed for the areas, the upper end portions of the baffles are fixed to the furnace roof of the chlorination roasting furnace, and the lower end portions of the baffles can be opened or closed. A first flue is arranged in the zinc chloride volatilization area, the lead chloride volatilization area is provided with a second flue, the feeding area is provided with a green ball inlet, the discharging area is provided with a metallized pellet outlet, and the green ball inlet is connected with the green ball outlet. By means of the system and method, separation of lead, zinc and iron is achieved, and energy consumption is small.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a system and method for treating lead-zinc smelting slag. Background technique [0002] Lead and zinc are indispensable and important metal materials in the process of national economic development, and are widely used in industrial production and human life. In recent years, lead and zinc smelting enterprises have developed rapidly, and China has become one of the most important lead and zinc producers in the world. [0003] The scale and number of lead and zinc smelting enterprises in my country are expanding year by year, the output of lead and zinc is increasing rapidly, and smelting technology has made great progress. However, the lead-zinc smelting process is complicated, and there are many links that produce pollutants. The rapid development of lead-zinc smelting has led to the generation of a large amount of waste gas, sewage, waste residue, etc., causing serious en...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B13/02C22B19/30C22B19/04C21B13/00
CPCC21B13/0046C22B7/04C22B13/025C22B19/04C22B19/30Y02P10/20
Inventor 王福佳古明远王敏吴佩佩王健月王建华吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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