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High-proportion pyrite cinder pellet sintering technique

A technology of pellet sintering and sulfuric acid slag, applied in the field of sintering process, can solve the problems such as the inability to meet the strict requirements of blast furnaces, the inability to apply high proportion of sulfuric acid slag, and the inability to achieve high proportion of sulfuric acid slag, etc. The effect of reducing environmental pollution

Active Publication Date: 2015-01-21
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, sulfuric acid slag cannot be applied to steel production in a high proportion
[0005] Most of the sulfur can be removed in the high-temperature oxidation agglomeration, but due to the high sulfur content of the sulfuric acid slag, neither the sintering method nor the pelletizing method can meet the strict requirements on the sulfur content of the blast furnace, and cannot achieve a high proportion of sulfuric acid slag

Method used

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  • High-proportion pyrite cinder pellet sintering technique

Examples

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Embodiment 1

[0024] In this example, sulfuric acid slag from a place in Hunan is selected, with a sulfur content of 1.33%, and coke powder is used as fuel, of which 60% of the coke powder is used in step (1), and 40% of the coke powder is used in step (2), such as figure 1 Shown technological process specifically comprises the following steps:

[0025] (1) Preparation of pellets: Mix sulfuric acid slag and iron concentrate powder at a mass ratio of 3:7 to form the main ore, in which the particle size of sulfuric acid slag is less than 0.074mm, which is 85.3%; then the main ore, bentonite (binder) , coke powder, quicklime (flux) and returned ore plus water are mixed to form a mixed ore, wherein the quality of bentonite is 1.2% of the main ore quality, the quality of coke powder is 3.36% of the main ore quality, and the quality of quicklime is 5.5% of the main ore quality %, the quality of the returned ore is 15% of the main ore quality, and the amount of water added is 9.5% of the main ore ...

Embodiment 2

[0028] This embodiment selects sulfuric acid slag from a place in Anhui, and the sulfur content is 1.65%, such as figure 1 Shown technological process specifically comprises the following steps:

[0029] (1) Preparation of pellets: Mix sulfuric acid slag and iron concentrate powder according to the mass ratio of 3.5:6.5 to form the main ore, in which the particle size of sulfuric acid slag is less than 0.074mm, which is 89.5%; the main ore, bentonite (binder), Coke powder (fuel), quicklime (flux) and returned ore are mixed with water to form a mixed ore, in which the mass of bentonite is 1.5% of the mass of the main ore, the mass of coke powder is 4.4% of the mass of the main ore, and the mass of quicklime is the main mass of the ore 4.5%, the quality of the returned ore is 20% of the main ore quality, and the amount of water added is 8.7% of the main ore quality. The mixed ore was pelletized on a pelletizer, the pelletizing time was 13 minutes, the green ball drop strength w...

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Abstract

The invention discloses a high-proportion pyrite cinder pellet sintering technique which comprises the following steps: mixing pyrite cinder and fine iron powder in a mass ratio of 1:(1-4) to obtain main ores; mixing the main ores, binding agent, fuel, fluxing agent and return ores with water to obtain mixed ores, wherein the binding agent accounts for 0.6-3.0 wt% of the main ores, the fuel accounts for 3.0-6.5 wt% of the main ores, the fluxing agent accounts for 3.0-15.0 wt% of the main ores, the return ores account for 5-35 wt% of the main ores, and the water accounts for 3.0-18.0 wt% of the main ores; preparing the mixed ores into pellets; and coating a fuel layer on the pellet surfaces, sintering to obtain thermally sintered ores, cooling the thermally sintered ores, crushing and screening to obtain the finished sintered ores and return ores. The technique disclosed by the invention has the advantages of simple process and environment friendliness, combines the advantages of the pelletizing technique and sintering technique, and effectively enhances the pyrite cinder proportion in the sintered ores.

Description

technical field [0001] The invention relates to a sintering process in the field of metallurgy, in particular to a high proportion sulfuric acid slag pellet sintering process. Background technique [0002] Sulfuric acid slag is a kind of industrial waste discharged from pyrite (pyrite, pyrrhotite, marcasite, etc.) through fluidized bed furnace roasting to produce sulfuric acid, commonly known as "burning slag" or "sulfuric acid slag". . Every time 1 ton of sulfuric acid is produced, 0.7 to 1.0 tons of sulfuric acid slag must be discharged. my country is a big producer of sulfuric acid, and the annual discharge of sulfuric acid slag exceeds 10 million tons, accounting for about 30% of the total annual discharge of chemical waste in the country. According to statistics, only 10% of the sulfuric acid slag discharged from the domestic production of sulfuric acid is used, and the rest is stored as waste. Therefore, once the wind and rain blow, it will bring red current and acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/14
Inventor 赵强宁顺明佘宗华邢学永封志敏万洪强王文娟吴江华
Owner CHANGSHA RES INST OF MINING & METALLURGY
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