Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for preparing magnesium-containing pellets from coarse-grained iron-containing ore

A magnesium pelletizing and coarse-grained technology is applied in the field of preparing magnesium-containing pellets from coarse-grained iron-bearing ore, which can solve the problems of long production process, need for drying raw materials, and easy to run red in the sedimentation tank, so as to achieve a short production process, The effect of good quality and low cost of finished pellets

Active Publication Date: 2020-12-22
北京中宏联工程技术有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the conventional fine-grained magnetite concentrate pellet production process, adding wet ball milling process will bring new problems, such as wet grinding process will have longer production process (ball milling-classification-concentration-sedimentation-filtration), sedimentation tank Easy to run red, causing water pollution and the disadvantages of over-grinding; dry ball milling process requires dry raw materials, which is easy to cause dust pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing magnesium-containing pellets from coarse-grained iron-containing ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, a method for preparing magnesium-containing pellets from coarse-grained iron-containing ore comprises the following steps:

[0037] (1) Under the natural water state (water content 8.5%), the coarse-grained hematite powder is crushed to -3mm and accounts for 100% through two stages of roller crushing. The roller gaps of the roller crushing are 10mm and 3mm respectively, and then use High-pressure roller mill pretreatment once, no edge material circulation, pressure between rollers of high-pressure roller mill is 50N / mm 2 , the obtained fine ore -0.074mm accounts for 72.44% (-0.045mm accounts for 35.19%), and the specific surface area is 1310cm 2 g -1 , the obtained fine-grained iron concentrate has a TFe content of 65.3%, SiO 2 Content 2.1%;

[0038] (2) Adding bentonite content of 1.0% to make pellets, the pelletizing time is 12min, the particle size of the green pellets is 10-16mm, the drop strength of the obtained green pellets is 6.4 times / 0.5...

Embodiment 2

[0042] In this embodiment, a method for preparing magnesium-containing pellets from coarse-grained iron-containing ore comprises the following steps:

[0043] (1) Crushing the coarse-grained hematite powder in natural water state (water content 8.5%) through two sections of rollers until -3mm accounts for 100%, and the roller gaps of the roller crushing are 10mm and 3mm respectively. Circular pretreatment of high-pressure roller grinding material once, the pressure between the high-pressure roller grinding rollers is 50N / mm 2 , the recycling ratio of edge material is 20%, the treatment to -0.074mm accounts for 75.31% (-0.045mm accounts for 39.21%), and the specific surface area is 1420cm 2 g -1 , the obtained iron ore concentrate has a TFe content of 65.3%, SiO 2 Content 2.1%;

[0044] (2) Adding bentonite content of 1.0% to make pellets, the pelletizing time is 12min, the particle size of green pellets is 10-16mm, the drop strength of the obtained green pellets is 7.0 time...

Embodiment 3

[0048] In this embodiment, a method for preparing magnesium-containing pellets from coarse-grained iron-containing ore comprises the following steps:

[0049] (1) Crushing the coarse-grained hematite powder in natural water state (water content 8.5%) through two sections of rollers until -3mm accounts for 100%, and the roller gaps of the roller crushing are 10mm and 3mm respectively. Circular pretreatment of high-pressure roller grinding material once, the pressure between the high-pressure roller grinding rollers is 50N / mm 2 , the scrap recycling ratio is 50%, the treatment to -0.074mm accounts for 80.42% (-0.045mm accounts for 45.99%), and the specific surface area is 1570cm 2 g -1 , the obtained iron ore concentrate has a TFe content of 65.3%, SiO 2 Content 2.1%;

[0050] (2) Adding bentonite content of 1.0% to make pellets, the pelletizing time is 12min, the particle size of green pellets is 10-16mm, the drop strength of the obtained green pellets is 7.0 times / 0.5m, the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
burst temperatureaaaaaaaaaa
Mohs hardnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing magnesium-containing pellets from coarse-grain iron-containing ore. The method comprises the following steps of (1), carrying out 1-N stages of roller-crushing on the coarse-grain iron-containing ore, or carrying out combined treatment on the coarse-grain iron-containing iron ore through a high-pressure roller mill after 1-N stages of roller-crushing,and crushing the coarse-grain iron-containing ore to meet the requirements of the particle size and specific surface area of a pelletizing raw material to obtain a fine-grain concentrate; (2), uniformly mixing the fine-grain concentrate, bentonite, carbon-containing powder, light-burned magnesite and limestone to carry out pelletizing to obtain green-balls with proper particle size and performance; and (3), distributing the green-balls on special equipment for drying, preheating and roasting and carrying out drying, preheating and roasting treatment on the green-balls. According to the method, the defect of an ore grinding process of fine-grain fine powder required for preparing the pellets from the coarse-grain-grade iron-containing raw material is overcome, meanwhile, through cooperation of the alkalinity and MgO and the carbon-containing technology, the target of directly producing the high-quality pellets from the coarse-grained powder ore and the refractory powder ore is achieved, compared with a conventional method, the new method is short in production process, low in cost, easy to operate and small in pollution, and the source of the pellet raw material is greatly expanded.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a method for preparing magnesium-containing pellets from coarse-grained iron-containing ore. Background technique [0002] As a high-quality charge for modern blast furnace ironmaking, pellets have the characteristics of uniform particle size, high cold strength, high iron grade and good reducibility, so the proportion of pellets used in charge is getting higher and higher. For the production of pellets, the characteristics of raw materials not only determine the processing and smelting performance of the pellets in the furnace, but also determine the selection of the pellet production system and process. [0003] With the increase of high-quality magnetite mining and procurement costs, in order to control costs and improve market competitiveness, modern iron and steel enterprises need to innovate production applications and processes. Iron-containing ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/245C22B1/16
CPCC22B1/16C22B1/2406C22B1/2413C22B1/245Y02P10/20
Inventor 潘建朱德庆李启厚郭正启田宏宇杨聪聪
Owner 北京中宏联工程技术有限公司