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MgO base desulfurizing agent and producing method thereof

A desulfurization agent and binder technology, applied in the field of new desulfurization agent materials and manufacturing processes, can solve the problems of less than 50% utilization rate of magnesium, low efficiency of magnesium refining reaction, serious magnesium volatilization, etc., and achieve stable and improved desulfurization rate. Desulfurization kinetic conditions, the effect of easy operation

Active Publication Date: 2009-08-26
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mg-based desulfurizer is currently the first choice for desulfurization outside the molten iron furnace, but there are still many deficiencies in the research and application of magnesium-based desulfurizers in molten iron pretreatment: (1) Metal magnesium desulfurizers used in iron and steel enterprises need passivation treatment , the price is higher; (2) the volatilization of magnesium at high temperature is serious, so that the refining reaction efficiency of magnesium is relatively low. 0.030% sulfur needs to consume 0.227kg of magnesium. Recently, in domestic industrial production, about 0.45kg of magnesium is actually needed to remove about 0.030% of sulfur in 1 ton of molten iron. Obviously, the utilization rate of magnesium is less than 50%; (3) Due to the high vapor pressure of magnesium at high temperature, there are potential safety hazards in the use of metal magnesium granular desulfurizers, and its preventive measures and addition methods need to be further studied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: (by mass percentage)

[0023] MgO+C (graphite or charcoal): 80%

[0024] SiO 2 : 8%

[0025] pH regulator: 5%

[0026] Binder: 7%

[0027] Dry and pre-treat the raw materials of the various components of the above desulfurizer (except the binder), completely remove the moisture in them, crush and grind them into -200 mesh fine powder, then weigh and mix according to the mass percentage, and fully Stir and mix evenly, add binder, and stir evenly again to make agglomerates into particles of different shapes, which are put into use after drying and packaging.

Embodiment 2

[0028] Embodiment 2: (by mass percentage)

[0029] MgO+C (graphite or charcoal): 85%

[0030] SiO 2 : 5%

[0031] pH Regulator: 2%

[0032] Binder: 8%

[0033] The manufacturing process is consistent with Example 1.

Embodiment 3

[0034] Embodiment 3: (by mass percentage)

[0035] MgO+C (graphite or charcoal): 90%

[0036] SiO 2 : 3%

[0037] pH Regulator: 1%

[0038] Binder: 6%

[0039] The manufacturing process is consistent with Example 1.

[0040] The desulfurizer obtained in the above examples is directly added into the ladle or ladle during tapping or steel tapping, the amount of slag is small and no slag removal is required, and no injection equipment or other related equipment is required. The medium temperature drop is small, the desulfurization product is stable, and the desulfurization rate is stable.

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PUM

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Abstract

The invention relates to an MgO-based desulfurizer and a preparation method thereof, which relate to the field of out-of-furnace desulfurization technology, and mainly relate to a novel desulfurizer material and manufacturing process for desulfurizing molten iron or molten steel. It is characterized in that the desulfurizer is composed of MgO, graphite or charcoal, reaction accelerator, pH regulator, and binder, wherein MgO plus graphite or charcoal accounts for 70% to 90% of the desulfurizer, and SiO2 is the reaction accelerator , the pH regulator is one of lime, limestone, dolomite, and silica, and the binder is pitch, tar, and resin. The preparation method is to dry and pretreat the various components of the desulfurizer first, then crush and grind them into fine powder, add a binder, and then stir evenly to form agglomerates into particles of different shapes, and then dry and pack them to make finished products . The purpose of the present invention is to solve the problems of reducing the cost of desulfurization, effectively suppressing the possible explosion hazard of magnesium vapor, and greatly improving the efficiency of the desulfurizer.

Description

Technical field: [0001] The invention relates to the technical field of out-of-furnace desulfurization, and mainly relates to a novel desulfurizer material and a manufacturing process for desulfurizing molten iron or molten steel. Background technique: [0002] Today’s iron and steel industry is still dominated by the long-process technology of blast furnace and converter, and the steel output accounts for about 70% of the total output. There are three stages of converter smelting and refining outside the furnace. The various chemical reactions of steelmaking are decomposed from the past in a converter to three stages to complete. Various chemical reactions are carried out under their optimal conditions, resulting in improved The productivity is improved, the production cost is reduced, and the steel with purer quality is obtained, which meets the higher requirements of various industries for steel quality. [0003] In addition to special requirements for desiliconization a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C1/02
Inventor 张廷安豆志河牛丽萍任晓东赫冀成刘燕蒋孝丽
Owner NORTHEASTERN UNIV LIAONING