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
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  • Abstract
  • Description
  • Claims
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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

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  • 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 ...

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Abstract

The invention relates to a method for preparing high-alkalinity chromium-containing vanadium-titanium pellets by adopting calcium oxide. The method comprises the following steps of mixing the raw materials including vanadium titano-magnetite, additive calcium oxide powder and sodium bentonite, so that the alkalinity of the raw materials is 1.8 to 2.1, drying and drying respectively, and carrying out dry mixing and mixing; averagely distributing the mixed ore materials into two parts, adding water accounting for 3% to 4% of the total mass of the raw materials in the first part, adding water with the total mass of 6% to 8% of the total mass of the raw materials in the second part, uniformly mixing, and hermetically standing; when pelletizing is carried out, a first part of mineral powder isused in the forming period of the master ball, a second part of mineral powder is used in the growth period of the master ball, the water spraying amount before the growth of the master ball is controlled to be 1ml of 10g of ore powder to 2ml of 10g of ore powder of mineral powder, preventing adhesion between the master balls, and adding water for 40 seconds to 90 seconds at each time, so that thediameter of the prepared pellets ranges from 8mm to 12mm; and preparing raw ball braised material, drying, pre-xidizing and roasting, carrying out 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

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Application Information

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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
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