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Method for separating iron, zinc and carbon in blast furnace sludge

A technology of blast furnace gas mud and gas mud, applied in the direction of process efficiency improvement, recycling technology, etc., can solve problems such as unconsidered zinc recovery, unknown effect, etc., achieve good magnetic separation effect, high comprehensive utilization rate of resources, energy The effect of low consumption

Active Publication Date: 2015-11-18
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not consider the recovery of zinc, and its effect on gas mud with high zinc content is unknown.

Method used

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  • Method for separating iron, zinc and carbon in blast furnace sludge
  • Method for separating iron, zinc and carbon in blast furnace sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: In the laboratory, the gas mud was placed in a muffle furnace for 100 min at 600°C to convert iron oxide into magnetite; the obtained calcined sand was placed in an iron tank protected by nitrogen gas, and a thermoelectric Cool it to about 390°C, put it in the air and cool it to room temperature, so that the magnetite is transformed into pseudohematite; the obtained calcined sand has a finer particle size and lower hardness, and it is wet-milled in a ball mill for 7 minutes, and the particle size is less than 0.074mm. More than 85%; according to the mass fraction, add about 1% alcohol for magnetic separation, and the magnetic field strength is 0.1T, to obtain iron concentrate and zinc-rich material; Leach at ℃ for 4 hours, and filter to obtain zinc-enriched liquid and fine carbon powder. The obtained iron concentrate contains 43.6% iron, 6.7% zinc, 0.8% carbon, and an iron recovery rate of 75.6%; the zinc content of the zinc-enriched liquid is 72.6g / L, and th...

Embodiment 2

[0046]Example 2: Put the gas mud described in Table 1 in a muffle furnace for 80 minutes at 700°C, place the obtained calcined sand in an iron tank protected by nitrogen, and insert a thermocouple to cool it to about 400°C. Cool in the air to room temperature; then use a wet ball mill to grind the ore for 12 minutes, add about 0.5% water glass according to the mass fraction for magnetic separation, and the magnetic field strength is 0.2T to obtain iron concentrate and zinc-rich material; the obtained zinc-rich material is mixed with 15% ammonium chloride was leached at room temperature for 4 hours at a liquid-to-solid ratio of 3:1, and then filtered to obtain zinc-enriched liquid and fine carbon powder. The obtained iron concentrate contains 49.1% iron, 5.0% zinc, 0.6% carbon, and an iron recovery rate of 80.1%; the zinc content of the zinc-enriched liquid is 71.3g / L, and the zinc recovery rate is 72.2%; 5.9% iron, 2.8% zinc, 79.4% carbon recovery.

Embodiment 3

[0047] Example 3: Put the gas mud described in Table 1 in a muffle furnace and reduce it for 60 minutes at 800°C, place the obtained calcine in an iron tank with nitrogen protection, insert a thermocouple to cool to about 420°C, and place Cool in the air to room temperature; then use a wet ball mill to grind the ore for 15 minutes, add about 1% glycerin according to the mass fraction for magnetic separation, and the magnetic field strength is 0.3T to obtain iron concentrate and zinc-rich material; the obtained zinc-rich material is mixed with 15 % ammonia water was leached at 50°C for 4 hours at a liquid-solid ratio of 3:1, and filtered to obtain zinc-enriched liquid and fine carbon powder. The obtained iron concentrate contains 45.4% iron, 5.6% zinc, 0.6% carbon, and an iron recovery rate of 78.9%; the zinc content of the zinc-enriched liquid is 81.3g / L, and the zinc recovery rate is 78.5%; 6.1% iron, 1.4% zinc, 70.5% carbon recovery.

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Abstract

The invention discloses a method for separating iron, zinc and carbon in blast furnace sludge. The method for separating the iron, the zinc and the carbon in the blast furnace sludge comprises the steps that the blast furnace sludge is oxidized after being directly magnetically roasted; wet magnetic separation is conducted after proper ore grinding, so that iron concentrate from magnetic separation and tailing zinc-rich materials are obtained; zinc in the zinc-rich materials is extracted by means of a leaching agent, so that a zinc-rich solution and carbon powder are obtained. All products obtained by treating the blast furnace sludge through the method can be effectively utilized, and zero discharge of solid waste of the blast furnace sludge is achieved. The method for separating the iron, the zinc and the carbon in the blast furnace sludge has the advantages that the technique is simple, investment is small, energy consumption is low, and the treatment effect is good. The method for separating the iron, the zinc and the carbon in the blast furnace sludge can provide important theoretical guidance and technical support for comprehensive utilization of blast furnace sludge resources in iron and steel plants.

Description

technical field [0001] The invention relates to magnetization roasting, magnetic separation and chemical leaching, and belongs to the technical field of mineral processing, in particular to a method for separating iron, zinc and carbon from blast furnace gas mud. Background technique [0002] Gas mud is one of the most important secondary resources for blast furnace ironmaking. It mainly contains ferric oxide, elemental carbon, zinc oxide, etc. Low-zinc gas mud can be directly used as sintering raw material. However, the continuous addition of new raw materials makes zinc enriched in the blast furnace, which has a negative impact on production. The output of high-zinc gas mud in my country exceeds 10 million tons per year. If it is not utilized, it will not only waste resources, but also cause environmental problems. Therefore, it is an urgent problem for iron and steel enterprises to find an economical and reasonable method to effectively recycle gas mud. At present, gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C22B1/00C22B1/02C22B19/30C01B31/02
CPCY02P10/20Y02W30/50
Inventor 郝建璋曾冠武黎建明文永才
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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