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Method for preparing sintered forsterite by re-firing magnesite tailings

A technology for sintering forsterite and magnesite, which is applied in the direction of magnesium silicate and silicate, can solve the problems of waste of resources, pollution of the environment by magnesite tailings, etc., and achieve better fire resistance, improved refractoriness, The effect of excellent comprehensive performance

Inactive Publication Date: 2020-04-17
HAICHENG CITY ZHONGHAO MAGNESIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention relates to a method for preparing sintered forsterite by reburning magnesite tailings, which overcomes the deficiencies of the prior art, solves the problems of environmental pollution and resource waste of accumulated and stored magnesite tailings, and develops a production A new method for synthesizing forsterite with low cost, high density, high purity and good refractoriness is conducive to the large-scale production and utilization of magnesite tailings

Method used

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  • Method for preparing sintered forsterite by re-firing magnesite tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 75kg of magnesite tailings magnesite tailings and 15kg of silica fine powder silica fine powder were placed in a tube mill for co-grinding for 20 minutes to obtain a co-grinding material; the co-grinding material was mixed with 2kg of Mg(OH) 2 Put them together in a mixer, mix at 300r / min for 12 minutes to obtain a mixture; use a ball press to press the mixture into balls with a diameter of 10mm at 5Mpa; place the balls at 110°C and dry for 3 hours to obtain Dry pellets: Alternately mix dry pellets with 10kg of anthracite (thickness of dry pellets 120mm, thickness of anthracite 75mm), distribute and calcinate in a shaft kiln at 1450°C for 5.5 hours, and leave the kiln after the kiln naturally cools down to obtain heavy Burnt forsterite.

[0026] Test the bulk density and porosity of the sample according to GB / T2997~2000; test the iron oxide content of the sample according to GB / T 21114~2017; test the refractoriness of the sample according to GB / T 7322~2007. The dead bu...

Embodiment 2

[0028] 75kg of magnesite tailings magnesite tailings and 15kg of silica fine powder silica fine powder were placed in a tube mill for co-grinding for 25 minutes to obtain a co-grinding material; the co-grinding material was mixed with 2kg of MgSO 4 Put them together in a mixer, mix at 300r / min for 15 minutes to obtain a mixture; use a ball press to press the mixture into balls with a diameter of 10mm at 5Mpa; place the balls at 110°C and dry for 3 hours to obtain Dried pellets: alternately dry pellets and 10kg of anthracite (the thickness of pellets after drying is 120mm, and the thickness of anthracite is 75mm), distribute and calcinate in a vertical kiln at 1600°C for 8 hours, and leave the kiln after the kiln naturally cools down to obtain Burnt forsterite.

[0029] Test the bulk density and porosity of the sample according to GB / T 2997~2000; test the iron oxide content of the sample according to GB / T 21114~2017; test the refractoriness of the sample according to GB / T 7322~...

Embodiment 3

[0031] 75kg of magnesite tailings magnesite tailings and 15kg of silica fine powder silica fine powder were placed in a tube mill for co-grinding for 25 minutes to obtain a co-grinding material; the co-grinding material was mixed with 2kg of MgCl 2 Put them together in a mixer, mix at 300r / min for 15 minutes to obtain a mixture; use a ball press to press the mixture into balls with a diameter of 10mm at 5Mpa; place the balls at 110°C and dry for 3 hours to obtain Dried pellets: alternately dry pellets and 10kg of anthracite (the thickness of pellets after drying is 120mm, and the thickness of anthracite is 75mm), distribute and calcinate in a vertical kiln at 1650°C for 10 hours, and leave the kiln after the kiln naturally cools down to obtain Burnt forsterite.

[0032] Test the bulk density and porosity of the sample according to GB / T 2997~2000; test the iron oxide content of the sample according to GB / T 21114~2017; test the refractoriness of the sample according to GB / T 7322...

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Abstract

The invention relates to a method for preparing sintered forsterite by re-firing magnesite tailings, and belongs to the field of magnesite comprehensive utilization and refractory material calcination. The sintered forsterite is prepared from magnesite tailings, silica fine powder and anthracite as raw materials and an additional binding agent according to a certain ratio through steps of co-grinding, ball pressing, drying and firing. Compared with the method in the prior art, the method of the invention has the beneficial effects that the magnesite tailings are effectively utilized so as to relieve the ecological environment problem caused by accumulation of the magnesite tailings, the magnesite tailings and the silica fine powder are adopted as raw materials, the sintered forsterite is produced through a reburning method, the enrichment effect of the silicon dioxide in the magnesite flotation tailings is fully utilized, and the produced forsterite refractory material is low in iron oxide content and good in fire resistance compared with natural forsterite.

Description

technical field [0001] The invention belongs to the fields of comprehensive utilization of magnesite and calcination of refractory materials, and in particular relates to a method for preparing sintered forsterite by reburning magnesite tailings. Background technique [0002] Forsterite belongs to orthorhombic crystal system, consistent melting binary compound, stable crystal form, high load softening temperature, good thermal shock stability and chemical stability, and is widely used in metallurgy, building materials, glass, ceramics, etc. field. There are also forsterite mines in nature. For example, there are considerable reserves of natural magnesite deposits in Henan, Hubei and other places in China. Then, the natural forsterite mines have a high content of iron oxide, so their scope of use is limited. Therefore, forsterite is synthesized industrially. The research has become one of the hot spots in the industry. [0003] At present, the synthesis methods of forsterit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/22
CPCC01B33/22C01P2006/10
Inventor 王明夺刘士军赵嘉亮罗旭东
Owner HAICHENG CITY ZHONGHAO MAGNESIUM CO LTD
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