Preparation method of fayalite

A technology of fayalite and pressing into blocks, which is applied in the direction of inorganic chemistry, silicon compounds, non-metallic elements, etc., can solve the problems of difficult to realize industrial production, low product purity, harsh reaction conditions, etc., and achieve low equipment requirements and high purity High, mild effect

Inactive Publication Date: 2017-08-04
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods either have complicated steps and harsh reaction conditions, or the products obtained are not of high purity, making it difficult to realize industrial production.

Method used

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  • Preparation method of fayalite
  • Preparation method of fayalite
  • Preparation method of fayalite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Fe, Fe 2 o 3 and SiO 2 Weigh 20g of raw materials according to the molar ratio of 3:2:3, measure 2ml of absolute ethanol, mix and ball mill, then press into blocks under a pressure of 20MPa, put the block raw materials into an atmosphere tube furnace, and feed inert gas in Under the condition of 1100 ℃, carry out high-temperature solid-state reaction for 180 minutes. After cooling, the crushing ball mill passes through a 200-mesh sieve, and then undergoes magnetic separation. The non-magnetic material is the product fayalite. Synthetic fayalite XRD pattern as shown figure 2 As shown, the fayalite content in the synthetic product is more than 95.3%, and the remaining 4.7% is Fe 1-x O, SEM images of reaction raw materials and synthesized fayalite image 3 shown.

Embodiment 2

[0031] Fe, Fe 2 o 3 and SiO 2 Take by weighing 20g of raw materials according to the molar ratio of 4:2:3, measure 4ml of absolute ethanol, mix and ball mill, then press into blocks under a pressure of 40MPa, put the block raw materials into an atmosphere tube furnace, and feed inert gas in Under the condition of 1000 ℃, carry out high-temperature solid-state reaction for 240 minutes, after cooling, crush ball mill and pass through a 200-mesh sieve, and then carry out magnetic separation and separation. The non-magnetic material is the product fayalite. The fayalite content in the synthetic product is over 96%, and the main crystal phase is Fe 2 SiO 4 .

Embodiment 3

[0033] Fe, Fe 2 o 3 and SiO 2 Take by weighing 20g of raw materials according to the molar ratio of 5:2:3, measure 6ml of absolute ethanol, mix and ball mill, then press into blocks under a pressure of 50MPa, put the block raw materials into an atmosphere tube furnace, and feed inert gas in Under the condition of 1200°C, carry out high-temperature solid-state reaction for 120 minutes. After cooling, it is crushed and ball-milled through a 200-mesh sieve, and then separated by magnetic separation. The non-magnetic material is the product fayalite. The fayalite content in the synthetic product is over 96%, and the main crystal phase is Fe 2 SiO 4 .

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Abstract

The invention discloses a preparation method of fayalite. The method includes steps of mixing and ball-milling Fe, Fe2O3 and SiO2 solid raw materials and lower alcohol, and then pressing into blocks; placing the blocks in a protective atmosphere, and sintering at the temperature of 900-1200 DEG C; performing crushing and magnetic separation on the sintered product, wherein the non-magnetic matter is fayalite with high purity and good crystal form. The method is simple in both technique and equipment, relatively gentle in condition, and free from waste gas pollutant; the shortcomings of compounding the fayalite by high pressure, high temperature and other harsh conditions are overcomein the current method; the method has a great significance in scientific research of geophysics, geology, fireproofing material and other fields, and the post-research of copper quenching slag, nickel slag, fuming slag and other FeO-SiO2 slag to realize the resource utilization.

Description

technical field [0001] The invention relates to a method for preparing fayalite, in particular to a method for preparing high-purity fayalin in a mild environment, which belongs to the cross field of metallurgical engineering and environmental engineering. Background technique [0002] Ferrosilicon composite oxides are the main components ubiquitous in the earth's crust and mantle. They belong to the key objects and hotspots in the fields of geophysics, geology and refractory materials. FeO-SiO 2 It is the main phase of iron element in smelting slag. my country's accumulated FeO-SiO 2 The slag reaches 7438×10 4 t, and is still increasing at a rate of about 3 million tons per year. The iron grade in this type of slag can generally reach about 30-40%, which is much higher than the average grade of 29.1% in smelted iron ore. It is a potential iron resource, but the More than 80% of the iron in the slag exists in the fayalite phase, and the embedded particle size is very fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20
CPCC01B33/20C01P2002/72C01P2004/03C01P2006/80
Inventor 彭兵王忠兵梁彦杰刘恢张立奉赵宗文彭宁王大伟陈玉洁朱顺雷杰
Owner CENT SOUTH UNIV
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