Manufacturing method of magnesium-calcium regeneration brick

A technology of regenerated bricks and magnesia-calcium bricks, which is applied in the field of metallurgical refractory recycling and utilization, can solve the problems affecting the product quality of magnesia-calcium bricks, the reduction of volume density, the reduction of strength and load softening temperature, etc., and achieve the improvement of density and reduction of Environmental pollution, reduce the effect of cracking

Inactive Publication Date: 2013-04-03
HUZHOU MINGDE REFRACTORY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the used magnesia-calcium bricks are easily hydrated and pulverized during storage after demolition and waste, which changes the component structure of the original magnesia-calcium bricks, greatly reduces their bulk density, and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, a kind of preparation method of magnesia-calcium regenerated brick, process steps are as follows:

[0019] 1. Take the waste magnesia-calcium bricks that have just been dismantled from each refining furnace, and properly crush the large blocks of cohesive bricks to remove impurities, residues, and residual steel on the surface of the bricks.

[0020] 2. Store the selected and cleaned waste magnesia-calcium bricks in a sealed warehouse. In the sealed warehouse, moisture-proof materials are used as interlayers around and on the top, and a plastic cloth layer is used to prevent moisture when pouring concrete on the ground, and sealed doors and windows are used for doors and windows.

[0021] 3. The waste magnesia-calcium bricks taken out from the sealed warehouse are put into the kiln for rapid calcination in time. The rapid calcination process system is as follows: the initial temperature in the kiln is controlled at 650-750°C, and then the temperatu...

Embodiment 2

[0029] Example 2, a preparation method of magnesium-calcium regenerated bricks, the process steps are basically the same as those in Example 1, except for process step 5, ingredients: its composition and composition ratio by weight percentage are: waste magnesia-calcium brick granular sand 5 -3mm 26%, 5-3mm 27%,

[0030] The binding agent in the process step 6 is acetone, which is 3% of the total amount of ingredients, and it is molded after uniform mixing.

[0031] The obtained regenerated magnesia-calcium brick products have been tested:

[0032] Bulk density 3.02g / cm 3 , the apparent porosity is 5.88%, the compressive strength is 70Mpa, and the load softening temperature is 1700°C.

Embodiment 3

[0033] Example 3, a preparation method of magnesium-calcium regenerated bricks, the process steps are basically the same as those in Example 1, except for process step 5, ingredients: its composition and composition ratio by weight percentage are: waste magnesia-calcium brick granular sand 5 -3mm 28%, 5-3mm 27%,

[0034] The binding agent in the process step 6 adopts honey, which is 5% of the total amount of ingredients, and is molded after being evenly stirred.

[0035] The obtained regenerated magnesia-calcium brick products have been tested:

[0036] Bulk density 3.02g / cm 3 , the apparent porosity is 5.81%, the compressive strength is 57Mpa, and the softening temperature under load is 1700°C.

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Abstract

The invention relates to a manufacturing method of a magnesium-calcium regeneration brick. The manufacturing method comprises the following steps of: preparing waste magnesium-calcium bricks which are just discharged and removed from each refining furnace, cleaning the waste magnesium-calcium bricks up, and then storing the waste magnesium-calcium bricks in a dry and airtight environment; putting the waste magnesium-calcium bricks into a kiln in time and rapidly calcining, and then crushing the calcined magnesium-calcium bricks to obtain waste magnesium-calcium brick granule sand; and carrying out die pressing and firing on the waste magnesium-calcium brick granule sand instead of a great mass of new magnesium-calcium sand raw materials to obtain a regenerated magnesium-calcium brick product. According to the manufacturing method, the quality of crushed materials of the waste magnesium-calcium bricks is similar to that of the new magnesium-calcium sand and the waste magnesium-calcium bricks can substitute the new magnesium-calcium sand, and therefore the addition amount of the waste magnesium-calcium brick granules in the fired magnesium-calcium brick is greatly increased. Proved by practices, the addition amount of the waste magnesium-calcium brick granules in the regenerated magnesium-calcium brick can reach 50-75 percent, and the regenerated magnesium-calcium brick reaches the performance level of the original magnesium-calcium brick, therefore, refractories of AOD (Argon Oxygen Decarburization), VOD (vacuum oxygen debikeburization) and other refining furnaces can be circularly recycled, the purpose of zero emission is reached, the consumption of dolomite ore sources is effectively reduced, and the cost and the environmental pollution degree are lowered.

Description

technical field [0001] The invention relates to a recycling method for metallurgical refractory materials. Background technique [0002] In the past two decades, especially in the past ten years, with the development of refined steel, the development and technological progress of magnesium-calcium refractory materials have been greatly promoted. Burnt magnesia-calcium bricks and unfired magnesia-calcium-carbon bricks have become indispensable and difficult to replace refractories for special steel smelting equipment such as stainless steel. However, with the wide application of magnesia-calcium-carbon bricks, a large amount of waste magnesium after use has also been caused Calcium bricks not only occupy a large amount of stacked land and pollute the environment, but also cause a great waste of available resources. Therefore, it is of great practical significance to carry out the recycling and reuse of waste magnesium calcium bricks after demolition. According to reports, Sh...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 虞畅严培忠吴开道陈欢翁小燕唐宁费国荣郎丽华
Owner HUZHOU MINGDE REFRACTORY MATERIAL
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