A method for preparing medium-low alkalinity all-vanadium-titanium self-fluxing pellets by using calcium oxide

A calcium oxide and self-fluxing technology, which is applied in the field of iron and steel metallurgy and ironmaking, can solve the problems of low ball-forming efficiency, low compressive strength, and easy bonding of the cue ball, and achieves improved green ball strength and compressive strength. , the effect of excellent performance

Active Publication Date: 2020-04-14
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in the production process of medium and low alkalinity pellets, due to the excessive water absorption in the process of mineral powder and pelletization, the composition is uneven, the cue balls are easy to bond, the efficiency of pelletizing is low, and it is easy to dry after drying. Burst, low ball forming rate, compressive strength lower than blast furnace requirements, etc.

Method used

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  • A method for preparing medium-low alkalinity all-vanadium-titanium self-fluxing pellets by using calcium oxide
  • A method for preparing medium-low alkalinity all-vanadium-titanium self-fluxing pellets by using calcium oxide
  • A method for preparing medium-low alkalinity all-vanadium-titanium self-fluxing pellets by using calcium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Take 5Kg of low-chromium vanadium-titanium magnetite in Hongge area as raw material, prepare 90.81g of pure calcium oxide powder for analysis, and 50g of sodium-based bentonite as additives, and obtain an alkalinity of 0.8; calcium oxide powder accounts for 1.8 of the total amount of raw materials %.

[0044] 2. Put the raw materials and additives in an enamel tray and dry them in a drying oven at a temperature of 105°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%;

[0045] 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%;

[0046] 4. Dry-mix the vanadium-titanium ore powder, analytically pure ca...

Embodiment 2

[0055] 1 Take 5Kg of low-chromium vanadium-titanium magnetite in Hongge area as raw materials, prepare 102.2g of pure calcium oxide powder for analysis, and 50g of sodium bentonite as additives, and the alkalinity obtained is 0.9; calcium oxide powder accounts for 2.02% of the total mass of raw materials .

[0056] 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%;

[0057] 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%;

[0058] 4. Dry-mix the vanadium-titanium ore ...

Embodiment 3

[0067] 1. Take 5Kg of low-chromium vanadium-titanium magnetite in the Hongge area as raw materials, prepare 113.5g of pure calcium oxide powder for analysis, and 50g of sodium bentonite as additives, and the alkalinity obtained is 1.0; calcium oxide accounts for 2.25% of the total mass of raw materials .

[0068] 2. Put the raw materials and additives in an enamel tray and dry them in a drying oven at a temperature of 105°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%;

[0069] 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%;

[0070] 4. Dry-mix the vanadium-titanium ore powder, analytically pure calcium ...

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Abstract

The invention relates to a method for preparing middle and low alkalinity all-vanadium-titanium self-fluxed pellets through calcium oxide. According to the method, vanadium-titanium ore powder, calcium oxide powder and sodium bentonite are dried first, and then are subjected to dry mixing, water is added for matching, and uniform material mixing and closed standing are performed; pelletizing is performed, the water spraying amount is controlled at 1ml / 10g ore powder to 2ml / 10g ore powder before growing of mother balls, and the interval between water adding and material adding each time is 45 seconds to 90 seconds, the ore powder sufficiently rolls to be compacted, and green ball pellets are made; green balls are subjected to material braising; drying is performed, and then pre-oxidizing roasting is performed; and temperature rises, secondary high temperature oxidizing roasting is performed, then cooling is performed, and the middle and low alkalinity high chrome type all-vanadium-titanium self-fluxed pellets are made. The method solves the problems that the green balls are low in strength, low in compressive strength and large in humidity, and prone to pulverization, bursting and the like after drying, and the middle and low alkalinity high chrome type all-vanadium-titanium self-fluxed pellets are made. The made pellets meet the furnace entering requirement of a blast furnace,improves the pellet ore-forming efficiency and lowers cost.

Description

technical field [0001] The invention relates to a method for preparing medium-low alkalinity all-vanadium-titanium self-fluxing pellets by using calcium oxide, which belongs to the field of iron and steel metallurgy and ironmaking production. Background technique [0002] Vanadium-titanium magnetite is a compound ore of multi-metal elements. It is a special magnetic iron ore that is symbiotic with iron, vanadium and titanium. It is called vanadium-titanium magnetite. Vanadium-titanium magnetite is not only an important source of iron, but also associated with various components such as vanadium, titanium, chromium, cobalt, nickel, platinum group and scandium. The differences lead to the different characteristics of vanadium-titanium magnetite in various places. According to different types of vanadium-titanium magnetite, the smelting methods and internal reaction properties of the smelting process are also significantly different. [0003] The use of iron ore powder pellet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/02
CPCC22B1/02C22B1/2406
Inventor 薛向欣宋翰林高子先程功金黄壮杨合
Owner NORTHEASTERN UNIV LIAONING
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