Method for preparing reduced iron powder through blast furnace gas dust smelting furnace slag

A technology for blast furnace gas ash and slag, which is applied in the field of preparing reducing iron powder, can solve problems such as difficulty in realizing efficient recovery of iron, and achieve the effects of good economic benefits, efficient recovery and good application prospects.

Active Publication Date: 2019-07-23
唐山鑫联环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zinc oxide is a product for the recovery of roasting flue gas, and the blast furnace gas ash smelting slag also contains more than 30% metallic iron. The existing technology only adopts a relatively simple process, and

Method used

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  • Method for preparing reduced iron powder through blast furnace gas dust smelting furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]This embodiment provides a method for producing reduced iron powder from blast furnace gas ash smelting slag, such as figure 1 As shown, the method includes the following steps:

[0041] (1) The blast furnace gas ash smelting slag is sent to the jaw crusher through an artificial belt, and a slit screen is installed at the exit of the crusher for inspection screening. The large particles with a particle size greater than 8 mm on the screen fall back to the storage plant, and the workers re- Shovel on the feeding belt for crushing; the material under the slotted sieve falls into the scraper machine I, and then enters the first-stage ball mill; 0.074mm particles;

[0042] (2) Send the ore grinding product of the second-stage ball mill into the mixing tank from the scraper machine III, and add water to adjust the slurry to obtain an ore slurry with a concentration of 40g / L, and drive it into the screw feeder with a slurry pump;

[0043] (3) The material enters the 8-layer ...

Embodiment 2

[0048] This embodiment provides a method for producing reduced iron powder from blast furnace gas ash smelting slag, and the method includes the following steps:

[0049] (1) The blast furnace gas ash smelting slag is sent to the jaw crusher through an artificial belt, and a slit screen is installed at the exit of the crusher for inspection screening. The large particles with a particle size greater than 8 mm on the screen fall back to the storage plant, and the workers re- Shovel on the feeding belt for crushing; the material under the slotted sieve falls into the scraper machine I, and then enters the first-stage ball mill; 0.074mm particles;

[0050] (2) Send the ore grinding product of the second-stage ball mill into the mixing tank from the scraper machine III, and add water to adjust the slurry to obtain an ore slurry with a concentration of 45g / L, and drive it into the screw feeder with a slurry pump;

[0051] (3) The material enters the 9-layer spiral separator, the w...

Embodiment 3

[0056] This embodiment provides a method for producing reduced iron powder from blast furnace gas ash smelting slag, such as figure 1 As shown, the method includes the following steps:

[0057] (1) The blast furnace gas ash smelting slag is sent to the jaw crusher through an artificial belt, and a slit screen is installed at the exit of the crusher for inspection screening. The large particles with a particle size greater than 8 mm on the screen fall back to the storage plant, and the workers re- Shovel on the feeding belt for crushing; the material under the slotted sieve falls into the scraper machine I, and then enters the first-stage ball mill; 0.074mm particles;

[0058] (2) Send the ore grinding product of the second-stage ball mill into the mixing tank from the scraper machine III, and add water to adjust the slurry to obtain a slurry with a concentration of 30g / L, and drive it into the screw feeder with a slurry pump;

[0059] (3) The material enters a 10-layer spira...

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Abstract

The invention relates to a method for preparing reduced iron powder through blast furnace gas dust smelting furnace slag. The method comprises the steps that the blast furnace gas dust smelting furnace slag is sequentially crushed and ball-milled; water is added to a material obtained after ball milling for size mixing, then slurry is put in a spiral sorting machine for sorting, and iron ore concentrate and tailings are obtained; the tailings flow out from the tangent line of the bottom spiral outer edge of the spiral sorting machine and directly enter a table sorting machine for sorting, andiron ore concentrate and tailings are obtained; and iron ore concentrates obtained at different sorting stages are mixed and then subjected to reduction roasting, and the reduced iron powder is obtained. The blast furnace gas dust smelting furnace slag is crushed and ball-milled at first, small particles are obtained, iron and carbon are completely separated, then sorting and recycling are conducted through the synergistic effect of the spiral sorting machine and a table, and finally the reduced iron powder product with the grade being 98% or above is obtained, iron elements in the blast furnace gas dust smelting furnace slag is efficiently recovered, and the method has good economic benefits and application prospects.

Description

technical field [0001] The invention relates to the fields of solid waste recycling and mineral processing, in particular to a method for preparing reducing iron powder by using blast furnace gas ash smelting slag. Background technique [0002] With the rapid rise of the economy and the vigorous development of the country's pillar industries, my country's steel industry has ushered in a climax of development. Crude steel production rose from only 160,000 tons in 1949 to 100 million tons for the first time in 1996, and quickly increased to 928 million tons in 2018. This means that the average daily output of crude steel has reached 2.58 million tons, which is 16 times the annual output at the beginning of the founding of the People's Republic of China. During the smelting process of steel, some blast furnace gas ash will be produced, the quality of which is about 1 / 50 of the steel output. In 1949, the output of blast furnace gas ash in my country was less than 5,000 tons, wh...

Claims

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Application Information

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IPC IPC(8): B22F9/22C22B1/02B03B7/00B03B9/04
CPCB22F9/22C22B1/02B03B7/00B03B9/04Y02P10/20
Inventor 张武李金惠马黎阳李永华余嘉栋林琳
Owner 唐山鑫联环保科技有限公司
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