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Method for comprehensively recycling carbon, iron, aluminum, zinc and lead from blast furnace gas sludge

A blast furnace gas mud and iron recovery technology, applied in the fields of iron, lead, comprehensive recycling of carbon, aluminum, and zinc, can solve the problems of difficulty in recovering aluminum and lead, low grade of iron concentrate, and low carbon recovery rate, etc. The effect of reducing process cost, reducing drug dosage and improving grade

Active Publication Date: 2019-05-28
WUHAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for comprehensively recovering blast furnace gas mud from blast furnace gas mud in order to solve the problems of low blast furnace gas peat recovery rate, low iron concentrate grade, difficulty in recycling aluminum and lead, and easy environmental pollution in the prior art. Utilize carbon, iron, zinc, aluminum and lead methods to simultaneously realize high-efficiency recycling and low-pollution emissions in the blast furnace gas mud solid waste treatment process, taking into account economic and environmental benefits

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  • Method for comprehensively recycling carbon, iron, aluminum, zinc and lead from blast furnace gas sludge

Examples

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Embodiment 1

[0035] A method for comprehensive recovery and utilization of multiple valuable elements in blast furnace gas mud, the process flow chart is shown in figure 1 , including the following steps:

[0036] 1) Put the blast furnace gas mud into a drying oven, dry it at 120°C for 36 hours, and grind it with a planetary ball mill for 2 hours to obtain gas ash with a particle size of less than 0.1 μm;

[0037] 2) add water to the gas ash obtained in step 1) to make the slurry concentration 6wt%, stir evenly, add collector diesel oil and foaming agent 2# oil to the obtained slurry (the amount of collector relative to gas mud is 7wt%; The consumption of foaming agent relative to the gas mud is 4wt%) then add unslaked lime to adjust the pH value of the gained slurry to 11, carry out a rough separation three times to concentrate and collect carbon slurry and tailings; Drying under high temperature for 24 hours, then adding 5 times the dilute sulfuric acid with a mass concentration of carb...

Embodiment 2

[0049] A method for comprehensive recycling of multiple valuable elements in blast furnace gas mud, specifically comprising the following steps:

[0050] 1) Put the blast furnace gas mud into a drying oven, dry it at 120°C for 36 hours, and grind it with a planetary ball mill for 2 hours to obtain gas ash with a particle size of less than 0.1 μm;

[0051] 2) Add water to the gas ash obtained in step 1) to make the slurry concentration 6%, stir evenly, add collector diesel oil and foaming agent 2# oil to the obtained slurry, and the amount of collector relative to the gas mud is 7% by mass %; The amount of foaming agent relative to gas mud is 4% by mass fraction. Then add quicklime to adjust the pH value of the obtained slurry to 12, carry out a rough separation three times to collect the carbon slurry and tailings; filter the collected carbon slurry and dry it at 120°C for 24 hours, and then add 5 times the amount of carbon The mass concentration of ore mass is that the dilut...

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Abstract

The invention discloses a method for comprehensively recycling carbon, iron, aluminum, zinc and lead from blast furnace gas sludge. The method comprises the steps that blast furnace gas sludge is subjected to drying, crushing, grinding, multi-stage flotation, pickling and suction filtration to recover carbon at first; tailings with carbon recovered are leached in acid, oxidized and filtered to obtain a filtrate and filter residue; then the pH value of the obtained filtrate is adjusted, and iron hydroxide, zinc hydroxide and aluminum hydroxide are precipitated in steps, and respectively calcined to obtain iron concentrate, zinc concentrate and aluminum concentrate; and a saturated ammonium acetate solution is added into the filtered filter residue, stirred and filtered, a sodium carbonate solution is added into the filtrate, filtering is carried out to obtain basic lead carbonate precipitation, and roasting is carried out to obtain lead concentrate. The involved recycling process easy to operate, carbon, iron, zinc, aluminum and lead in the gas sludge can be comprehensively recycled, recycling of various valuable elements is achieved, pollution to the environment is reduced, and themethod has important economic and environmental benefits and suitable for being applied and popularized.

Description

technical field [0001] The invention belongs to the field of metallurgical solid waste recycling and utilization, and relates to a method for comprehensive recycling of various valuable elements in blast furnace gas mud, in particular to a method for comprehensive recycling of carbon, iron, aluminum, zinc, lead method. Background technique [0002] Blast furnace gas mud is a product obtained by wet dust removal, washing, precipitation and concentration of fine particles produced by the reaction in the high temperature zone during the iron and steel smelting process and raw material dust carried by blast furnace gas. Its main components are carbon, iron, zinc and relatively high content Valuable or toxic metal elements such as aluminum and lead. At present, my country produces more than 5 million tons of blast furnace gas mud every year. Apart from being stored as solid waste, it is generally used as a sinter ingredient. Due to the fine particle size of the gas mud, the gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30C22B21/00C22B13/00
CPCY02P10/20
Inventor 谢峻林吴鹏辉刘小青何峰杨家鸣杨文浩毛驰
Owner WUHAN UNIV OF TECH
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