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Comprehensive recovery method for smelted lead waste slag of blast furnace

A recycling method and blast furnace technology, which are applied in the field of metal waste slag recycling, can solve problems such as difficult recycling of iron metal resources, and achieve the effects of controlling environmental pollution and alleviating the lack of mineral resources.

Active Publication Date: 2013-03-13
云南锐洁鑫再生资源综合利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the blast furnace lead smelting waste slag contains less iron than pyrite slag, and non-ferrous metals and metal oxides such as copper, lead, zinc, gold, and silver are 2-4 times the content of pyrite slag. Dealing with pyrite slag recovery method, even if non-ferrous metals can be recovered through subsequent processes, it is difficult to recover ferrous metal resources

Method used

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  • Comprehensive recovery method for smelted lead waste slag of blast furnace
  • Comprehensive recovery method for smelted lead waste slag of blast furnace
  • Comprehensive recovery method for smelted lead waste slag of blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) First, carry out wet overflow ball milling to 160 mesh of the waste slag of the lead smelting blast furnace, and the filtrate filtered by the fine slag slurry enters the liquid circulation, and the dry fine slag is collected by filtration, and ammonium chloride and ferric chloride are added to the dry fine slag , iron trichloride, then chlorinated with a reducing agent (coking coal powder), matured for 24 hours, and roasted in a rotary kiln at a roasting temperature of 1200-1250°C, which is conducive to the volatilization of all non-ferrous metal oxides and the magnetization of iron. Make the iron in the ore powder form ferric oxide, leave the kiln at a temperature higher than 400°C, and cool it with circulating water to obtain reduced ore pulp.

[0023] The above-mentioned dry fine residue, chlorinating agent and reducing agent are in parts by weight: 100:10:12.

[0024] 2) The reduced ore pulp is subjected to weak magnetic separation with a magnetic field strength ...

Embodiment 2

[0028] 1) First, carry out wet overflow ball milling to 200 mesh of the waste slag of the lead smelting blast furnace, and the filtrate filtered by the fine slag slurry enters the liquid circulation, and the dry fine slag is collected by filtration, and ammonium chloride and ferric chloride are added to the dry fine slag , ferric chloride, in order to prevent the formation of iron silicate with low softening temperature, add magnesium chloride to oxidize it into magnesium oxide to increase the softening point of slag by 50-100°C, and add a reducing agent (coking coal powder) for chlorination and reduction for 24 hours. Rotary kiln roasting, the roasting temperature is 1200 ~ 1250 ℃, so that the iron in the ore powder will form ferric oxide, the temperature is higher than 400 ℃ out of the kiln, using circulating water plus 1.5% (V / V) sodium hydroxide to supplement the reduction and magnetization process, and the reduction pulp.

[0029] The weight ratio of the dry fine slag, ch...

Embodiment 3

[0034] 1) First, carry out wet overflow ball milling to 200 mesh of the waste slag of the lead smelting blast furnace, and the filtrate filtered by the fine slag slurry enters the liquid circulation, and the dry fine slag is collected by filtration, and ammonium chloride and ferric chloride are added to the dry fine slag , Ferric trichloride, in order to prevent the formation of iron silicate with low softening temperature, add magnesium chloride to oxidize it into magnesium oxide to increase the softening point of slag by 50-100°C, then add reducing agent (coking coal powder) to chlorinate and mature for 24 hours, Roast in a rotary kiln at a temperature of 1200-1250°C to make the iron in the ore powder form ferric oxide, exit the kiln at a temperature greater than 400°C, and use circulating water plus 2% (V / V) sodium hydroxide to supplement the reduction magnetization process. Restore the ore pulp.

[0035] The ratio of the dry fine slag, chlorination agent, magnesium chlorid...

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Abstract

The invention relates to a comprehensive recovery method for smelted lead waste slag of a blast furnace, and relates to a metal waste slag recovery method. The method comprises the following steps of: grinding the smelted lead waste slag of the blast furnace into powder with a certain particle size; mixing the powder, coking coal powder, ferric chloride homologues and ingredients; curing and roasting the mixture; and carrying out chlorination reduction volatilization to obtain magnetic ferric oxide powder and mixed smoke dust, wherein the iron recovery rate of the magnetized iron powder subjected to magnetic separation is over 80 percent; the qualified iron ore powder with more than or equal to 60 percent of the iron content can be obtained; the ash and the smoke dust are respectively subjected to dust collection and water-cooling adsorption to extract lead, zinc, copper, tin, stibium and the like; and the recovery rate is over 90 percent. Through the comprehensive recovery method, valuable metals are regenerated by using the smelted lead waste slag; environment pollution can be managed; and the condition of scarcity of mineral resources in China is relieved.

Description

technical field [0001] The invention relates to a recovery method of metal waste slag, in particular to a recovery method of blast furnace lead smelting waste slag. Background technique [0002] The blast furnace lead smelting waste slag contains iron about 30% of the total slag, while the distribution of non-ferrous metals is complex and the content is relatively large. Previously, the applicant proposed a method for processing pyrite slag with the "comprehensive recovery method of pyrite slag" (Patent No. ZL200510021005, 3), which is characterized in that the ore is firstly ground, and then chlorinated by magnetic separation. Volatile roasting, obtain qualified iron pellets, and recycle non-ferrous metal products. However, the blast furnace lead smelting waste slag contains less iron than pyrite slag, and non-ferrous metals and metal oxides such as copper, lead, zinc, gold, and silver are 2-4 times the content of pyrite slag. Even if non-ferrous metals can be recovered t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B1/02C22B3/10C22B3/46B03C1/00
CPCY02P10/20
Inventor 池煊庆
Owner 云南锐洁鑫再生资源综合利用有限公司
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