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Method utilizing nonferrous metal production waste to prepare calcium aluminate used for metallurgy

A technology for producing waste and non-ferrous metals, which is applied in the production field of metallurgical auxiliary material calcium aluminate, can solve problems such as unsatisfactory cost, and achieve the effects of high product cost, poor practicability and resource saving.

Active Publication Date: 2011-05-18
大连环球矿产股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low TiO produced from industrial alumina and its by-products in Chinese patent ZL 200310125135.2 2 Calcium aluminate process, the performance is also very good, but the cost is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046] Example 1: Prepare calcium aluminate with pool kiln.

[0047] Take 1700kg of calcium slag, 200kg of dolomite, and 100kg of magnesite as raw materials, crush them to below 3mm, add raw materials when the temperature of the kiln rises to 1350°C, and continue to heat up until the raw materials melt, and the molten liquid flows out continuously from the discharge port. Keep the kiln temperature and continuously replenish raw materials for continuous production. Outflow of liquid ironware, natural air cooling into large pieces, and then crushed to particles smaller than 25mm, the composition and content (wt%) of the product after analysis and inspection are: CaO: 49.32, Al 2 o 3 : 40.86, TiO 2 : 0.05, SiO 2 : 2.11, MgO: 5.92, S: 0.035, P: 0.023.

example 2

[0048] Example 2: Prepare calcium aluminate with electric furnace.

[0049] The particle size of the raw materials used is all below 100mm. Take 1140kg of calcium slag, 200kg of bauxite, 260kg of lightly burned magnesium, and 100kg of soda ash for later use. The electric furnace is ignited to generate temperature, and the materials are added successively. After the whole furnace is completely melted, the electrode is lifted, the liquid is poured into cold water, the water is quenched into small particles of 1-6mm, and dried. The composition and content (wt%) of the product after analysis and inspection are: CaO: 43.01, Al 2 o 3 : 36.56, TiO 2 : 0.36, SiO 2 : 2.35, MgO: 13.74, Na 2 O: 3.01, S: 0.032, P: 0.020.

[0050] Two kinds of products of above example 1 and example 2 are applied to require low TiO 2 Special steel smelting desulfurization, the effect is remarkable.

example 3

[0051] Example 3: Production of calcium aluminate with a shaft furnace.

[0052]The raw materials are all crushed into pieces of 50-150mm. Take 1300kg of calcium slag, 100kg of limestone, 400kg of bauxite and 200kg of fluorite and mix them for later use. The fuel is 1200kg of metallurgical coke with 13% ash. Bottom coke is added to the shaft furnace and firewood is used to ignite the fire. The temperature is raised to 1450°C by blasting, and raw materials and coke are added in layers. The weight ratio of raw materials to coke is 3:1. The molten liquid is discharged intermittently and air-cooled into large pieces. Broken to 0 ~ 3mm small particles. After analysis and inspection of the product, its composition and content (wt%) are: SiO 2 : 4.48, CaO: 40.36, Al 2 o 3 : 42.87, TiO 2 : 0.66, MgO: 1.60, CaF 2 : 8.98, S: 0.038, P: 0.027. This product is used in smelting, with rapid slagging and high desulfurization rate.

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Abstract

A method utilizing nonferrous metal production waste to prepare calcium aluminate used for metallurgy adopts calcium slag (5.0 percent or less than 5.0 percent of SiO2, 32 to 55 percent of CaO, 36 to 55 percent of Al2O3, 0.1 percent or less than 0.1 percent of TiO2 and 20 to 100 percent of Fe2O3 and less MgO), 0 to 50 percent of bauxite, 0 to 50 percent of calcium oxide, 0 to 40 percent of limestone, 0 to 40 percent of calcite, 0 to 50 percent of fluorite, 0 to 50 percent of dolomite, 0 to 35 percent of light-burnt magnesia, 0 to 35 percent of dead-burnt magnesia, 0 to 45 percent of magnesite,0 to 30 percent of calcined soda and 0 to 30 percent of borax as materials; the materials are crashed, mixed equally according to proportion and then added into a kiln; and then the temperature of the kiln is raised to 1000 to 1600 DEG C to completely melt the materials; and after flowing out, the melting liquid is cooled by air or processed by water quench to become blocks; and the blocks are dried, cooled, crashed and sieved to obtain the finished product.

Description

technical field [0001] The invention relates to the production of calcium aluminate as a metallurgical auxiliary material, and also relates to the technical field of comprehensive utilization of waste slag produced by nonferrous metals. Background technique [0002] With the development of iron and steel technology, the quality requirements for metallurgical auxiliary materials are becoming more and more stringent, and the metallurgical auxiliary materials of pre-melted and aphanitic vitreous bodies are widely used, but they also consume a large amount of natural mineral resources. Especially for certain special steel grades for specific components, such as: S, P, F, TiO 2 , C and other indicators have special requirements, and only high-grade resources can meet the requirements, while some indicators are difficult to achieve with natural resources. [0003] Low TiO produced from industrial alumina and its by-products in Chinese patent ZL 200310125135.2 2 Calcium aluminate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 张延大张梦显
Owner 大连环球矿产股份有限公司
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