Method for manufacturing alkaline magnesium-rich pellet ore
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A technology of high-magnesium pellets and a manufacturing method, applied in the direction of improving process efficiency, etc., to achieve the effects of improving high temperature performance, avoiding strength deterioration, and saving flux costs
Active Publication Date: 2015-11-11
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Abstract
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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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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] 5.5 parts of magnesia ca...
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 magnesium calcium brick powder
[0083] ...
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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
Technical field: [0001] 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. Background technique: [0002] 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 alkaline high-mag...
Claims
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Application Information
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