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Method for producing fine iron sand powder by using ferro-sulphur ore as raw material and equipment thereof

A technology for pyrite and raw materials, applied in the field of iron fine sand powder, can solve the problems of expanding the production process, increasing the operation workers and power consumption, etc., and achieving the effects of huge economic benefits, saving manpower, and improving the level of resource utilization.

Inactive Publication Date: 2009-08-26
曹传东 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method makes both sulfur and iron elements in pyrite be utilized, but the disadvantage is that a new mixing system device is also required, which brings about the expansion of the production process and the increase of operating workers. and power consumption

Method used

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  • Method for producing fine iron sand powder by using ferro-sulphur ore as raw material and equipment thereof
  • Method for producing fine iron sand powder by using ferro-sulphur ore as raw material and equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Pyrite concentrate with a particle size of 0.44~0.077mm, sulfur content of 30.35% and iron content of 51.81%, is put into the boiling furnace for roasting from the feeding port 4 of the boiling furnace, and the bottom air pressure is controlled at 8483Pa and the bottom air volume is 157m 3 / min, the secondary air volume is 68m 3 / min, the bottom temperature of the boiling layer is 1090°C, the middle temperature is 1060°C, and the top temperature is 930°C. The slag discharged from the slag outlet 5 of the boiling furnace has an iron content of 59.75% and a sulfur content of 0.16%, which accounts for 30% of the total. %, the iron content of the dust from the top furnace gas outlet 8 is 63.98% and the sulfur content is 0.31%, which accounts for about 70% of the total. After the two are mixed, the iron content is 62.71% and the sulfur content is 0.265%. The quality requirements of industrial raw iron sand powder.

Embodiment 2

[0020] Pyrite concentrate with a particle size of 0.108~0.077mm, a sulfur content of 28.1% and an iron content of 52% is put into the boiling furnace for roasting from the boiling production feed port 4, and the bottom air pressure is controlled to 4990Pa and the bottom air volume is 68m. 3 / min, secondary air volume 157m 3 / min, the bottom temperature of the boiling layer is 900°C, the middle temperature is 1200°C, and the furnace top temperature is 1090°C. Almost no slag is discharged from the slag discharge port 4 of the boiling furnace. The burning dust from the furnace top furnace gas outlet 8 has an iron content of 65.2% The sulfur content is 0.45%, which is almost all the slag discharged from the boiling furnace. Its quality meets the requirements of ironmaking raw materials.

Embodiment 3

[0021] In Example 3, the pyrite concentrate with a particle size of 0.172~0.077mm, a sulfur content of 35.9% and an iron content of 49.1% was put into the boiling furnace for roasting from the feeding port 4 of the boiling furnace, and the bottom air pressure was controlled at 6686.6 Pa and the bottom air volume was 123.8 m 3 / min, secondary air volume 101.2m 3 / min, the bottom temperature of the boiling layer is 1050°C, the middle temperature is 1070°C, and the furnace top temperature is 980°C. The slag discharged from the slag outlet 4 of the boiling furnace has an iron content of 56.29% and a sulfur content of 0.35%, which account for 40% of the total ; The dust iron content from the furnace top furnace gas outlet 8 is 64.63%, and the sulfur content is 0.62%, which accounts for 60% of the total. After the two are mixed, the iron content is 61.3% and the sulfur content is 0.51%, which is in line with ironmaking The quality requirements of industrial raw material iron sand powder...

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Abstract

A method and equipment for producing iron concentrate sand powder using pyrite as raw material, is based on the fluidized furnace of the existing sulfuric acid plant from pyrite, using pyrite concentrate as raw material to increase the secondary air intake of the fluidized furnace, The distribution of secondary air into the furnace is designed to be double-layered and multi-point along the tangent line of the furnace body, so that the gas and ore particles are swirling and boiling under the push of the secondary air, prolonging the residence time of ore particles in the furnace , so that the gas and the ore particles can be fully contacted and fully burned, which greatly improves the burning rate of ore sulfur, so that the iron content of the discharged slag is 55-65%, and the sulfur content is 0.3-0.8%. The quality requirements of fine sand powder, turning waste slag into iron-making raw materials. The method and the equipment of the invention are simple, easy to implement, less investment, quick effect, make full use of the sulfur and iron elements of pyrite, improve the level of resource utilization, and the invention has huge economic benefits, social benefits and environmental protection benefits . It is suitable for popularization and application on devices for producing sulfuric acid from pyrite.

Description

Technical field [0001] The present invention relates to a method and equipment for beneficiating iron from pyrite, more specifically, it is a method and equipment for directly roasting pyrite to obtain iron sand powder. Background technique [0002] my country is a large country of pyrite, with abundant reserves accounting for 70% of the world's reserves. However, my country uses pyrite as a non-metallic mine to develop and utilize the sulfur element in it, mainly as sulfuric acid. Sulfuric acid production is the roasting of pyrite in a boiling furnace to obtain SO 2 The furnace gas is discharged from the top of the furnace and sent to the sulphuric acid system to make acid; the pyrite slag is discharged from the slag outlet at the bottom of the boiling furnace. Its iron content is 40-55% and sulfur content is more than 1%, which cannot reach the iron concentrate. It can only be used as a cement additive. Its utilization is not large and its economic value is very low. Most of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C01B17/74F27B1/00
Inventor 曹传东李时龙
Owner 曹传东