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A kind of manufacturing method of alkaline high-magnesium pellets

A technology for high magnesium pellets and a manufacturing method, which is applied in the direction of improving process efficiency, can solve the problems of increased production cost of pellets, impact of pellet strength, and capital required for flux, and achieves improved high temperature performance, saving flux costs, and avoiding The effect of weaker strength

Active Publication Date: 2017-06-16
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of alkaline high-magnesium pellets requires the addition of a large amount of dolomite, or magnesite + limestone, etc., but due to the high proportion of addition, and the decomposition of the flux during the roasting process, CO2 escapes. It will have a great impact on the strength of pellets, and it is difficult to produce
Moreover, the purchase of flux requires funds, which will increase the cost of pellet production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The specific steps for preparing alkaline magnesium-containing pellets by utilizing waste magnesia-calcium bricks in this method are as follows:

[0048] Ⅰ Pretreatment of recycled waste magnesia-calcium bricks

[0049] a first break

[0050] Use a jaw crusher to crush the waste magnesia-calcium bricks first, then sieve them with a sieve with a sieve hole of 20mm, and return the oversize to the crusher for re-crushing;

[0051] b Fine grinding

[0052] Part of the undersize (≤20mm) enters the R-type pendulum mill to be ground into magnesia-calcium brick powder, the grinding particle size: -0.074mm is 90.5%, and then transported into the ore blending bin by a sealed tanker;

[0053] Ⅱ Ingredients

[0054] Batching with iron concentrate etc.

[0055] Iron concentrate powder, bentonite, coal powder and ground magnesia-calcium brick powder are prepared according to the following parts by weight to form a batch. The specific ratio is:

[0056] Magnesia-calcium brick pow...

Embodiment 2

[0073] The specific steps of the preparation of alkaline high-magnesium pellets of the present embodiment are as follows:

[0074] Ⅰ Pretreatment of recycled waste magnesia-calcium bricks

[0075] a first break

[0076] Use a jaw crusher to crush the waste magnesia-calcium bricks first, then sieve them with a sieve with a sieve hole of 20mm, and return the oversize to the crusher for re-crushing;

[0077] b Fine grinding

[0078] Part of the undersize (≤20mm) enters the R-type pendulum mill to be ground into magnesia-calcium brick powder, the grinding particle size: -0.074mm is 90.8%, and then transported into the ore blending bin by a sealed tanker;

[0079] Ⅱ Ingredients

[0080] Batching with iron concentrate etc.

[0081] Iron concentrate powder, bentonite, coal powder and ground magnesia-calcium brick powder are prepared according to the following parts by weight to form a batch. The specific ratio is:

[0082] 6.6 parts of magnesia calcium brick powder

[0083] Iro...

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PUM

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Abstract

The invention relates to a method for manufacturing alkaline magnesium-rich pellet ore. The method comprises the steps of I pretreatment of recycled waste magnesia-calcium bricks, wherein a, primary breaking is carried out, and the waste magnesia-calcium bricks are broken into magnesia-calcium brick blocks; b, fine grinding is carried out, and the magnesia-calcium brick blocks are ground into magnesia-calcium brick powder; II batching, wherein iron concentrate powder and the magnesia-calcium brick powder are batched into batch mixtures, and 5.5-6.6 parts of the magnesia-calcium brick powder, 100 parts of the iron concentrate powder, 0.5-1 part of pulverized coal and 1.7 parts of bentonite are adopted according to the ratio; III pretreatment of the batch mixtures, wherein roll grinding is carried out on the batch mixtures; IV mixing, wherein the batch mixtures obtained through roll grinding are mixed; V pelletizing and screening, wherein mixed materials are pelletized and screened into qualified green pellets; VI drying, preheating and calcination, wherein the qualified green pellets are calcinated into pellet ore; VIII cooling, wherein the pellet ore is cooled to obtain the alkaline magnesium-rich pellet ore. The alkaline magnesium-rich pellet ore is produced through the waste magnesia-calcium bricks, the quaternary alkalinity of the pellet ore can be above 1.15%, and MgO is larger than or equal to 3.8%.

Description

[0001] Technical field: [0002] The invention relates to a method for recycling waste magnesia-calcium bricks from iron and steel plants to produce alkaline high-magnesium pellets, in particular to a method for manufacturing alkaline high-magnesium pellets. [0003] Background technique: [0004] In order to improve the metallurgical properties of the pellets, the production of magnesium-containing pellets will be considered. Because the high proportion of magnesium-containing flux will affect the contact between hematite particles, cause high roasting temperature, and affect the strength of pellets. Therefore, the MgO content in pellets is generally controlled within 2%. To continue to increase the MgO content in the pellets, it is necessary to consider adding some materials that are conducive to the formation of low-melting point substances, which will increase the calcium in the pellets, so that calcium ferrite minerals will be formed in the pellets. The production of alka...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/24C22B1/02
CPCY02P10/20
Inventor 贺淑珍冯焕林蔡湄夏范建军张华李昊堃
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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