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Magnesium-calcium-iron sand synthesized by taking dolomite and magnesite as raw materials and sintering and preparation method

A magnesia-calcium-iron sand and magnesite technology, applied in the field of refractory materials, can solve the problems of polluting environment products, complex production process and high production cost, and achieve the effects of reducing production cost, simple production process and improving product quality

Inactive Publication Date: 2019-01-18
海城利尔麦格西塔材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantages are that because its process belongs to "two-step calcination", not only the fuel combustion pollutes the environment and products, but also its process is relatively long, the production process is complicated, and the production cost is high.

Method used

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  • Magnesium-calcium-iron sand synthesized by taking dolomite and magnesite as raw materials and sintering and preparation method

Examples

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preparation example Construction

[0031] The preparation method of described magnesium calcium iron sand, comprises the steps:

[0032] 1) According to the proportion, put dolomite powder, magnesite powder, calcined magnesite powder and iron oxide red powder into the wet mill for kneading, add water with 25% to 35% of the total weight of raw materials, and stir for 30 to 40 minutes. It is in a state of holding hands into a ball and then loosening hands;

[0033] 2) Use a briquetting machine to press into magnesia-calcium-iron balls, or use a brick press to make magnesia-calcium-iron adobes, and the bulk density of the balls or adobes is > 2.3g / cm 3 ;

[0034] 3) The formed magnesium-calcium-iron balls or magnesium-calcium-iron bricks are sent to a drying kiln at a drying temperature of 50-80°C for more than 24 hours, and then sent to a high-temperature sintering device for sintering;

[0035] 4) Crushing the sintered magnesia-calcium-iron balls or magnesia-calcium-iron bricks to produce magnesia-calcium-iron s...

Embodiment 1-3

[0045] In embodiment 1-3, the preparation method of magnesium calcium iron sand is as follows:

[0046] 1) Batching: carry out the batching of each component according to Table 2.

[0047] 2) Mixing: put dolomite powder, magnesite powder, calcined magnesite powder and iron oxide red powder into the wet mill and knead, add water and stir for 30-40 minutes, (wherein Example 1 stirs for 32 minutes, Example 2 Stir for 35 minutes, Example 3 stirred for 38 minutes), ensure that the mixing is even, the water content of the mud after mixing is 25%~35% (wherein Example 1 is 28%, Example 2 is 30%, Example 3 33%), make the mud material reach the state of loosening after letting go of the hand into a ball, and then discharge.

[0048] 3) Molding: Send the mixed mud to the molding workshop, use a ball press to press into balls, or use a friction brick press to press into bricks, and the volume density of the formed magnesia-calcium-iron balls or magnesia-calcium-iron bricks is required G...

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Abstract

The invention relates to magnesium-calcium-iron sand synthesized by taking dolomite and magnesite as raw materials and sintering and a preparation method. The magnesium-calcium-iron sand is prepared by taking dolomite powder and magnesite powder as the raw materials, iron oxide red powder as an additive and lightly-burnt magnesium-calcium powder as a binding agent through mixing, carrying out ballpressing / blank pressing, carrying out high-temperature sintering and crushing; the ratio of each component is as follows in parts by weight: 45 to 87 parts of the dolomite powder and the magnesite powder, 10 to 50 parts of the lightly-burnt magnesium-calcium powder and 3 to 5 parts of the iron oxide red powder; a finished product has physical and chemical indexes as follows: less than 1.5 percentof SiO2, 4 to 6 percent of Fe2O3, less than 0.4 percent of Al2O3, 8.0 to 32.0 percent of CaO and 60 to 83 percent of MgO. By adopting the magnesium-calcium-iron sand provided by the invention, the history that only a two-step calcination method can be used for producing the magnesium-calcium-iron sand in China for many years is finished; a technological flow is short and a production technology is simple; the probability of pollution and the production cost of a product are reduced; the quality of the product is relatively improved.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to magnesia-calcium-iron sand synthesized by sintering and combining dolomite and magnesite as raw materials and a preparation method thereof. Background technique [0002] In the 1980s, Europe began to use natural high-iron magnesite in the Alps as raw material. After calcination, crushing, screening, batching, and mixing, it was directly laid on the bottom of the furnace, and used in electric furnace steelmaking, with good results. In the late 1980s, this refractory material entered China as a supporting material for ultra-high-power electric furnaces imported from abroad and occupied the Chinese market. [0003] my country once carried out scientific and technological research on the imported "alkaline refractory materials supporting technology for high-power and ultra-high-power electric furnaces". Refractory Materials Research Institute, Wuyang Iron and Steel Compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/622
CPCC04B35/043C04B35/622C04B2235/3206C04B2235/321C04B2235/3272C04B2235/608
Inventor 张义先王新杰董会彬陈东明袁青峰金钊
Owner 海城利尔麦格西塔材料有限公司
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