A kind of alkaline pellet preparation method and its preparation and used mineral powder mixture

A technology of alkaline pellets and mixtures, which is applied in the field of blast furnace metallurgy, can solve the problems of low proportion of pellets used, and achieve the effects of improving blast furnace smelting indicators, increasing alkalinity, and increasing the proportion of furnace input

Active Publication Date: 2019-04-23
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention solves the technical problem that the proportion of pellets used in blast furnace smelting is relatively low by providing a method for preparing alkaline pellets and the mineral powder mixture used in the preparation

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  • A kind of alkaline pellet preparation method and its preparation and used mineral powder mixture

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preparation example Construction

[0017] The embodiment of the present invention provides a method for preparing alkaline pellets, which is applied to the preparation of alkaline pellets. refer to figure 1 As shown, the method for preparing alkaline pellets provided by the embodiments of the present invention comprises the following steps:

[0018] S1. Mix hydrated lime and sodium bentonite evenly to form a hydrated lime mixture, wherein the mass percentage of hydrated lime in the hydrated lime mixture is 96% to 98%, and the mass percentage of sodium bentonite in the hydrated lime mixture is 2% to 4%. .

[0019] Specifically, in S1: First, according to the mass ratio of slaked lime and sodium bentonite (96-98): (4-2), weigh the slaked lime and sodium bentonite, and mix the weighed slaked lime and sodium bentonite evenly to form slaked lime Mixture.

[0020] Concrete, the Ca(OH) of the slaked lime used in the present embodiment 2 Content > 92%, particle size ≤ 44μm content ≥ 90%. The water absorption rate ...

Embodiment 1

[0031] Slaked lime and sodium bentonite are mixed uniformly at a mass ratio of 96:4 to form a slaked lime mixture, and then the concentrate powder is mixed with the prepared slaked lime mixture at a mass ratio of 95:5 to form a mineral powder mixture, and then mixed with water to form a uniform mixture. Adjust the moisture content of the mineral powder mixture to 7.3%. For example, take 0.288kg of slaked lime and 0.012kg of sodium bentonite and mix them uniformly to form a slaked lime mixture, then mix the prepared slaked lime mixture into 9.7kg of weighed concentrate powder and mix evenly into the ore-forming powder mixture.

[0032] The mineral powder mixture is made into green balls in the disc pelletizer for 12 minutes. After the green balls are made, sieve the green balls with a particle size of 9-16mm, and use a roasting cup to process the sieved green balls with a particle size of 9-16mm as follows: Roasting process: The raw balls are air-dried at 330°C for 3 minutes, t...

Embodiment 2

[0038] Slaked lime and sodium bentonite are mixed uniformly at a mass ratio of 98:2 to form a slaked lime mixture, and then the concentrate powder is mixed with the prepared slaked lime mixture at a mass ratio of 99:1 to form an ore-forming powder mixture, and then mixed with water to form a uniform mixture. Adjust the moisture content of the mineral powder mixture to 7.5%. For example, 0.343kg of slaked lime and 0.007kg of sodium bentonite are weighed and mixed uniformly to form a slaked lime mixture, and then the prepared slaked lime mixture is mixed into the weighed 9.75kg of concentrate powder and mixed evenly into the ore-forming powder mixture.

[0039] The mineral powder mixture is made into green balls in the disc pelletizer for 12 minutes. After the green balls are made, sieve the green balls with a particle size of 9-16mm, and use a roasting cup to process the sieved green balls with a particle size of 9-16mm as follows: Roasting process: The raw balls are air-dried ...

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Abstract

The invention discloses a method and a mineral powder mixture for preparing alkaline pellets, which are applied to the field of blast furnace metallurgy. The method for preparing the alkaline pellets comprises the following steps: uniformly mixing slaked lime and sodium activated bentonite to obtain a slaked lime mixture, wherein the slaked lime mixture comprises 96 to 98 percent of the slaked lime by mass and 2 to 4 percent of the sodium activated bentonite by mass; adding the slaked lime mixture into concentrate powder, and mixing uniformly to obtain the mineral powder mixture, wherein the mineral powder mixture comprises 95 to 99 percent of the concentrate powder by mass and 1 to 5 percent of the slaked lime mixture by mass; and preparing the mineral powder mixture into green pellets, screening the green pellets with qualified particle sizes, and performing a roasting process to obtain the alkaline pellets. Through the method and the mineral powder mixture for preparing the alkaline pellets, the technical problem that the use ratio of the pellets in blast furnace metallurgy is low is solved, the furnace entrance ratio of the pellets is improved, and a blast furnace smelting index is improved.

Description

technical field [0001] The invention relates to the field of blast furnace metallurgy, in particular to a method for preparing alkaline pellets and an ore powder mixture used for the preparation. Background technique [0002] Most of my country's iron ore resources are poor ore, and there are few rich ore. The available raw materials are mainly fine concentrates, and there are very few rich powder ores and lump ores. In this case, it is appropriate to mainly produce pellets, but due to historical reasons, my country's blast furnaces have always used high-alkalinity sintering as the main raw material, and a small amount of acid pellets. With the continuous increase in the demand for blast furnace concentrates and the increasing requirements for energy conservation and environmental protection, the development of pellets has become a trend. Pellets have the advantages of high grade, low gangue content, uniform particle size and good strength. [0003] At present, my country...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243
CPCC22B1/2406C22B1/243
Inventor 青格勒张卫东安钢田筠清张彦马泽军蔡皓宇李明刘文旺
Owner SHOUGANG CORPORATION
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