Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for preparing high-basic chromium-vanadium-titanium pellets by using calcium oxide

A calcium oxide and high alkalinity technology, applied in the field of iron and steel metallurgy and iron making, can solve the problems of uneven composition, easy bonding of the cue ball, low compressive strength, etc. The effect of increasing the compressive strength

Active Publication Date: 2020-05-05
NORTHEASTERN UNIV LIAONING
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the production process of the current high-alkalinity pellets, due to the large amount of water absorption in the process of mineral powder and pelletization, the pelletizing efficiency is low, the cue balls are easy to bond, the composition is uneven, and they are easy to burst after drying. The rate is low, the compressive strength is lower than the requirements of the blast furnace, etc.

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 high-basic chromium-vanadium-titanium pellets by using calcium oxide
  • A method for preparing high-basic chromium-vanadium-titanium pellets by using calcium oxide
  • A method for preparing high-basic chromium-vanadium-titanium pellets by using calcium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1. Get the low chromium vanadium-titanium magnetite in 5Kg Hongge area as raw material, prepare analytically pure calcium oxide powder 246.3g, and sodium bentonite 50g as additives, and the alkalinity obtained is 1.8; adding calcium oxide accounts for 4.9% of raw material quality.

[0055] 2. Put the raw materials and additives in an enamel tray and dry them in a drying oven at a temperature of 100°C. Since the CaO and bentonite added later will affect the dry mixing effect due to water absorption, it is necessary to Carry out sufficient drying to eliminate free water, and the drying time is 6 hours, so that the moisture content of the mineral powder is less than 1%;

[0056] 3. Sieve the dried vanadium-titanium ore powder with a -0.5mm sieve, finely grind and re-sieve those that do not meet the particle size requirements, so that the ore powder below 200 mesh reaches 70%;

[0057] 4. Dry-mix the vanadium-titanium ore powder with analytically pure calcium oxide powder a...

Embodiment 2

[0066] 1. Take 5Kg of low-chromium vanadium-titanium magnetite in Hongge area as raw material, prepare 259.93g of pure calcium oxide powder for analysis, and 50g of sodium bentonite as additives, and the alkalinity is 1.9; adding calcium oxide accounts for 5.15% of the raw material quality .

[0067] 2. Put the raw materials and additives in an enamel tray and dry them in a drying oven at a temperature of 104°C. Since the CaO and bentonite added later will affect the dry mixing effect due to water absorption, the mineral powder should be properly mixed. Carry out sufficient drying to eliminate free water, and the drying time is 6 hours, so that the moisture content of the mineral powder is less than 1%;

[0068] 3. Use a -0.5mm sieve to sieve the dried vanadium-titanium ore powder, and finely grind and re-sieve those that do not meet the particle size requirements, so that the ore powder below 200 mesh reaches 75%;

[0069] 4. Dry-mix the vanadium-titanium ore powder with ana...

Embodiment 3

[0078] 1. Take 5Kg low-chromium vanadium-titanium magnetite in Hongge area as raw material, prepare 273.6g of pure calcium oxide powder for analysis, and 50g of sodium bentonite as additives, and the alkalinity is 2.0; adding calcium oxide accounts for 5.42% of the raw material quality .

[0079] 2. Put the raw materials and additives in an enamel tray and dry them in a drying oven at a temperature of 104°C. Since the CaO and bentonite added later will affect the dry mixing effect due to water absorption, the mineral powder should be properly mixed. Carry out sufficient drying to eliminate free water, and the drying time is 5 hours, so that the moisture content of the mineral powder is less than 1%;

[0080] 3. Sieve the dried vanadium-titanium ore powder with a -0.5mm sieve, finely grind and re-sieve those that do not meet the particle size requirements, so that the ore powder below 200 mesh reaches 70%;

[0081] 4. Dry-mix the vanadium-titanium ore powder with analytically ...

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
diameteraaaaaaaaaa
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing high-alkalinity chromium-containing vanadium-titanium pellets by using calcium oxide. The method is to batch raw materials including vanadium-titanium magnetite and additives calcium oxide powder and sodium bentonite so that the alkalinity is 1.8 ~2.1, dry and dry mix the materials respectively; divide the mixed mineral materials into two parts evenly, add 3~4% water of the total mass of raw materials to the first part, and add 6~4% of the total mass of raw materials to the second part 8% water, mix evenly, seal and let stand; when making balls, use the first part of the mineral powder during the cue ball forming period, and the second part of the mineral powder for the long term when the cue ball grows. Spray before the cue ball grows. The amount of water is controlled at 1ml / 10g mineral powder ~ 2ml / 10g mineral powder to prevent adhesion between the cue balls, and the interval between each water addition and feeding is 40 to 90 seconds, so that the diameter of the produced pellets is within 8mm ~ 12mm; Carry out green pellet stewing, drying, pre-oxidation roasting, and secondary high-temperature oxidation roasting to obtain high-alkalinity chromium-containing vanadium-titanium pellets.

Description

technical field [0001] The invention relates to a method for preparing high-alkalinity chromium-vanadium-containing titanium pellets by using calcium oxide, and belongs to the technical field of iron and steel metallurgy and ironmaking production. Background technique [0002] At present, the charge structure of blast furnace ironmaking is composed of sinter, pellet ore and lump ore mixed in proportion, and the blast furnace smelting of vanadium-titanium magnetite is no exception. Generally speaking, blast furnace smelting requires slag alkalinity between 1.1-1.3, so high-basicity sinter (generally higher than 1.6) needs to add some acid pellets (basinity less than 0.9) to form a more suitable slag alkalinity. This is currently the main production process that uses high-basic sinter mixed with acid pellets and lump ore as the main production process. However, the initial melting point of Hongge chromium-containing vanadium-titanium sinter is high, and the liquid phase is le...

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): C22B1/243C22B1/02
Inventor 薛向欣宋翰林高子先程功金黄壮杨合
Owner NORTHEASTERN UNIV LIAONING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com