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Method for producing iron ore concentrate with high arsenic ferro-sulphur ore concentrate

A technology of arsenic pyrite and iron concentrate, which is applied in the field of high arsenic pyrite concentrate to produce iron concentrate, can solve the problems that clinker can not be used as iron concentrate, is not fully applicable, and is difficult, so as to facilitate transformation Implementation, small changes in equipment, and the effect of high-efficiency removal

Inactive Publication Date: 2008-08-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For arsenic pyrrhotite, the reaction in the first paragraph does not hold, so this method is not fully applicable
Fluidized bed roasting pyrite, it is difficult to keep the sulfur content in the slag below 0.4%, so the slag cannot be used as iron concentrate

Method used

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  • Method for producing iron ore concentrate with high arsenic ferro-sulphur ore concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: The raw material is pyrrhotite concentrate containing 1.5%-2% by mass of arsenic and 92% by mass of pyrite.

[0044] 1. Production of high-sulfur and low-arsenic slag:

[0045] High-arsenic pyrite concentrate with arsenic content of 1.5%-2% by mass, sulfur and iron content of 92% in total, particle size less than 0.074mm accounting for 70% of mass percent, as pyrite acid-making boiling furnace The raw materials are boiled and roasted in a boiling furnace, the excess air coefficient is controlled at 0.75-0.85, the roasting temperature is 880℃-980℃, the roasting intensity is 7 tons-9 tons / m2·day, and the roasting flue gas temperature is 800℃-950℃. After the flue gas is subjected to gravity sedimentation, cyclone dust removal and electrostatic precipitator, the dust content is less than 0.2 g / m3, and the flue gas temperature drops to 400℃-450℃, and then enters the cooling system of pyrite acid production. , Purification system, in this system, arsenic and sulfu...

Embodiment 2

[0049] Example 2: The raw material is pyrite concentrate containing 0.5%-1.5% by mass of arsenic and 93% by mass of pyrite.

[0050] 1. Production of high-sulfur and low-arsenic slag:

[0051] High-arsenic pyrite concentrate with arsenic content of 0.5%-1.5% by mass, sulfur and iron content of 93% in total, and particle size less than 0.074mm accounting for 20% by mass of pyrite concentrate as pyrite acid-making boiling furnace The raw materials are boiled and roasted in a boiling furnace, the excess air coefficient is controlled at 0.8-0.9, the roasting temperature is 850℃-950℃, the roasting intensity is 8 tons-10 tons / m2·day, and the roasting flue gas temperature is 800℃-900℃. After the flue gas is subjected to gravity sedimentation, cyclone dust removal and electrostatic precipitator, the dust content is less than 0.2 g / m3, and the flue gas temperature drops to 400℃-450℃, and then enters the cooling system of pyrite acid production. , Purification system, in this system, a...

Embodiment 3

[0055] Embodiment 3: The raw material is pyrite concentrate containing 2%-3% by mass of arsenic and 90% by mass of pyrite.

[0056] 1. Production of high-sulfur and low-arsenic slag:

[0057] High arsenic pyrite concentrate with 2%-3% mass percentage of arsenic, 90% mass percentage of sulfur and iron, less than 0.074mm and 90% mass percentage of high-arsenic pyrite concentrate is used as raw material for pyrite acid-making boiling furnace , roasting in a boiling furnace, the excess air coefficient is controlled at 0.7-0.8, the roasting temperature is 950℃-1000℃, the roasting intensity is 6 tons-8 tons / m2·day, and the roasting flue gas temperature is 850℃-950℃. After the gravity sedimentation, cyclone dust removal and electrostatic precipitator of the flue gas from pyrite for acid production, the dust content is less than 0.2 g / m3, and the temperature of the flue gas drops to 400℃-450℃, and it enters the cooling and purification of pyrite acid production In this system, arseni...

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Abstract

The invention relates to a method for producing iron ore concentrate with high arsenic-bearing pyrite concentrate. The invention comprises the steps that the arsenic-bearing pyrite concentrate is adopted as raw material used in a boiling furnace to be roasted with the excess air coefficient controlled at 0.7-0.9 and at the temperature of 850-1,000DEG C to remove arsenic; flue gas after being treated with dust removal enters into a purifying system in which the arsenic and sulfur are condensed and recycled to form arsenic and sulfur-rich slag; the purified flue gas is used for producing sulphuric acid and the cinder is the high-sulfur and low-arsenic cinder which is then mixed with low arsenic-bearing high-grade sulfur concentrate so as to form mixed material containing 24-30 percent of sulfur to be served as the material in the boiling furnace and roasted with high temperature of 900-1,000DEG C and the excess air coefficient controlled at 1.15-1.25. The flue gas after being treated with dust removal and purifying is then used for producing sulphuric acid and the mixed material is burnt into qualified iron ore concentrate. The technique of the invention can realize arsenic removal of high arsenic-bearing pyrite concentrate to obtain the qualified iron ore concentrate by merely changing technique parameters of the conventional system used for producing acid by the pyrite, which results in high utilization efficiency of iron ore resources in the high arsenic-bearing pyrite concentrate.

Description

1. Technical field: [0001] The invention relates to a method for producing iron concentrate from high-arsenic pyrite concentrate, and belongs to the technical field of chemical metallurgy. 2. Background technology: [0002] The progress and development of industry has become more and more dependent on mineral resources, but mineral resources are non-renewable. Therefore, the effective use of existing mineral resources is an important issue for today's social development. [0003] Pyrite is composed of iron and sulfur. Under the existing technical and economic conditions, only the sulfur in it can be effectively used, and the iron in it becomes solid waste and pollutes the environment while using sulfur. Therefore, pyrite is classified as It belongs to the sulfur ore resources, not the iron ore resources. There are huge reserves of pyrite resources in my country. While utilizing the sulfur in pyrite, if new techniques and technologies can be used to comprehensively utilize t...

Claims

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Application Information

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IPC IPC(8): C22B1/02
CPCY02P10/20
Inventor 文书明周兴龙
Owner KUNMING UNIV OF SCI & TECH
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