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A method for preparing manganese-containing powder pressed pellets with self-reducing properties

A powder and pellet technology is applied in the field of manganese-containing powder pressed pellet preparation, which can solve the problems of a large amount of ash content of the binder, large ash content, and low high-temperature strength of the pellet, so as to reduce the demand, improve the high-temperature strength and the price. low cost effect

Active Publication Date: 2021-07-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the obtained pellets have low high-temperature strength and the ash produced by the binder is large
[0006] To sum up, in order to solve the problems of a large amount of ash produced by the binder in the pressed pellets containing manganese powder and the low high temperature strength of the pellets, a new preparation method for pressed pellets containing manganese powder is urgently needed.

Method used

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  • A method for preparing manganese-containing powder pressed pellets with self-reducing properties
  • A method for preparing manganese-containing powder pressed pellets with self-reducing properties
  • A method for preparing manganese-containing powder pressed pellets with self-reducing properties

Examples

Experimental program
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Effect test

Embodiment 1

[0038] In this example, the reducing manganese-containing powder pressed pellets were prepared according to the following steps:

[0039] S1, mixing and stirring the manganese-containing powder and limestone to obtain a primary mixed raw material, wherein the quality of the limestone is 3-5% of the total mass of the manganese-containing powder;

[0040] S2, heating the coal tar, and adding coal tar pitch to the coal tar and stirring until the coal tar and the coal tar pitch are completely dissolved and mixed to obtain a binder;

[0041] S3. First feed water vapor into the mixer, and then add the primary mixed raw material in S1 and the binder in S2 to the mixer, so that the primary mixed raw material and binder are uniformly mixed to obtain the secondary mixed raw material , the mass of the added binder is 8-10% of the total mass of the manganese powder in S1;

[0042] S4, pressing the secondary mixed raw material in S3 into pellets;

[0043] S5, drying the pellets pressed a...

Embodiment 2

[0067] Such as figure 1 As shown, in this example, manganese-containing powder pressed pellets with reducibility are prepared according to the following steps, and the strength index of manganese-containing powder pressed pellets at each stage is detected during the preparation process. The specific steps are as follows:

[0068] S1, mixing for the first time, mixing the manganese powder and limestone and adding it to the mixer to stir to obtain a mixed raw material; the manganese powder includes manganese ore powder and manganese dust, the quality of the manganese ore powder and manganese dust The ratio is 7:3, manganese-containing dust includes blast furnace ashes and electric furnace ashes, and the particle size of manganese ore powder is below 5mm. Among them, the mass of manganese ore powder with a particle size between 3-5mm accounts for 31% of the total mass of manganese ore powder, and the particle size is 0.5 The mass of manganese ore powder between -3mm accounts for ...

Embodiment 3

[0077] The difference between the preparation process of the manganese-containing powder pressed pellets in this example and Example 2 is that in S2, the total mass of the binder is 10% of the total mass of the manganese-containing powder.

[0078] The strength indexes of the manganese-containing powder pressed pellets prepared in this example at each stage are respectively: the wet ball drop strength is 12.5 times (1m) -1 , The dry compressive strength is 1130N, the volatile compressive strength of pellets is 1024N, and the carbonized compressive strength of pellets is 1783N.

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Abstract

The invention discloses a preparation method of manganese-containing powder pressed pellets with self-reducing performance, which includes: mixing and stirring the manganese-containing powder and limestone to obtain a primary mixed raw material; heating coal tar, and adding coal tar pitch to the coal tar and stirring , until the coal tar and coal tar pitch are completely dissolved and mixed to obtain a binder; first pass water steam into the mixer, and then add the primary mixed raw materials and binder to the mixer respectively, so that the primary mixed raw materials and the bonded Mix the raw materials evenly with the agent to obtain the secondary mixed raw materials; press the secondary mixed raw materials into pellets; dry the pressed pellets to remove free water in the pellets to obtain dry balls; roast the dry balls to remove coal tar pitch and Volatile matter and crystal water in coal tar; carbonize the roasted pellets to carbonize coal tar and coal tar pitch into coke, and obtain the final pressed pellets containing manganese powder. The manganese powder pellets prepared by the invention have no added ash and reduce external coke in subsequent smelting.

Description

technical field [0001] The invention relates to the technical field of manganese-containing powder briquettes, in particular to a preparation method of manganese-containing powder briquettes with self-reducing performance. [0002] technical background [0003] For steelmaking enterprises, manganese is an indispensable element, so there is a saying that "no manganese can't make steel". As the demand for steel in the domestic market continues to increase, the output of manganese alloys also increases, followed by a substantial increase in the demand for manganese ore. my country's manganese ore resources are abundant but not rich. The average grade of manganese is about 22%, while manganese-rich ore (manganese oxide ore Mn≥30%, manganese carbonate ore Mn≥25%) resources only account for 6.71% of the total resources. With years of mining, the manganese ore produced in China is far from meeting the requirements, and a large amount of manganese ore needs to be imported every year...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/245C22B1/16
CPCC22B1/16C22B1/2406C22B1/245
Inventor 张斌
Owner HUNAN UNIV
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