Diopside ceramic glass prepared from chromic slag and coal gangue and preparation method of diopside ceramic glass

A technology of glass-ceramics and coal gangue, which is applied in the field of diopside glass-ceramics and its preparation, can solve the problem of high cost and achieve the effect of economical impurity removal

Pending Publication Date: 2017-05-17
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems referred to above, the purpose of the present invention is to solve the problem that the cost of additives is higher when preparing diopside glass-ceramics with chromium slag as raw material, and at the same time economically and efficiently reduce the iron oxide content in chromium slag

Method used

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  • Diopside ceramic glass prepared from chromic slag and coal gangue and preparation method of diopside ceramic glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The chromium slag of a certain chromium salt factory in Changsha is selected for use, and it contains the following components: 29 parts by weight of CaO, 30 parts by weight of MgO, 30 parts by weight of Al 2 o 3 12 parts by weight, SiO 2 6 parts by weight, Fe 2 o 3 13 parts by weight, Cr 2 o 3 6 parts by weight, Cr 6+ 2 parts by weight; select Shanxi Pingshuo coal gangue for use, which contains the following components: SiO 2 51 parts by weight, Al 2 o 3 19 parts by weight, Fe 2 o 3 4 parts by weight, K 2 O3 parts by weight, C15 parts by weight.

[0048] Mix the above 67 parts by weight of chromium slag and 33 parts by weight of coal gangue, and grind the mixture so that particles with a particle size of less than 74 microns account for more than 90% of the total number of particles in the mixture to obtain a mineral powder mixture. Then the milled mixture was roasted at 510°C for 40 minutes to make the Fe in the raw material 2 o 3 converted to Fe ...

Embodiment 2

[0050] Select the chromium slag of a chemical plant in Chongqing, which contains the following components: 25.75 parts by weight of CaO, 29.25 parts by weight of MgO, 29.25 parts by weight of Al 2 o 3 11.5 parts by weight, SiO 2 Contains 6.54 parts by weight, Fe 2 o 3 12.45 parts by weight, Cr 2 o 3 6.24 parts by weight, Cr 6+ 2.42 parts by weight; select Shanxi Pingshuo coal gangue for use, which contains the following components: SiO 2 51 parts by weight, Al 2 o 3 19 parts by weight, Fe 2 o 3 4 parts by weight, K 2 O 3 parts by weight, C 15 parts by weight.

[0051] Mix the above 60 parts by weight of chromium slag and 40 parts by weight of coal gangue, and grind the mixture so that particles with a particle size of less than 74 microns account for more than 90% of the total number of particles in the mixture to obtain a mineral powder mixture. Then the powder mixture was roasted at 520°C for 40min to make the Fe in the raw material 2 o 3 converted to Fe ...

Embodiment 3

[0053] Select the chromium slag of a chromium salt factory in Changsha, which contains the following components: 25 parts by weight of CaO, 20 parts by weight of MgO, 20 parts by weight of Al 2 o 3 10 parts by weight, SiO 2 Contains 5 parts by weight, Fe 2 o 3 15 parts by weight, Cr 2 o 3 8 parts by weight, Cr 6+ 2.5 parts by weight; select Shanxi Pingshuo coal gangue for use, which contains the following components: SiO 2 50 parts by weight, Al 2 o 3 25 parts by weight, Fe 2 o 3 5 parts by weight, K 2 2 parts by weight of O, 10 parts by weight of C.

[0054] Mix 70 parts by weight of chromium slag and 30 parts by weight of coal gangue, and grind the mixture so that particles with a particle size of less than 74 microns account for more than 90% of the total number of particles in the mixture to obtain a mineral powder mixture. Then the powder mixture was roasted at 500°C for 50 minutes to make the Fe in the raw material 2 o 3 converted to Fe 3 o 4 , to o...

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Abstract

The invention relates to a method for preparing diopside ceramic glass from chromic slag and coal gangue. The method comprises the following steps: mixing and grinding the chromic slag and the coal gangue according to the ratio to obtain a mineral powder mixture; roasting the obtained mineral powder mixture, and enabling Fe2O3 in the mixture to be reduced into Fe3O4 to obtain a roasted mineral powder mixture containing magnetic Fe3O4; carrying out magnetic separation on the obtained roasted mineral powder mixture in a magnetic field so as to remove the Fe3O4 in the mixture, thus obtaining mineral powder mixture subjected to iron removal; putting the obtained mineral powder mixture subjected to the iron removal into a silicon molybdenum rod high-temperature furnace, and heating, melting and homogenizing in a non-oxidizing atmosphere to obtain a molten state mixture; pouring the obtained molten state mixture into a preheated die for forming to obtain base glass; sequentially carrying out annealing, nucleating and crystallization treatment on the obtained base glass to obtain the diopside ceramic glass. According to the method disclosed by the invention, synthetic raw materials are zero cost; a synthesized product, namely the diopside ceramic glass, has higher added value.

Description

technical field [0001] The invention belongs to the field of glass-ceramics preparation, and more specifically relates to a diopside glass-ceramics prepared from chrome slag and coal gangue and a preparation method thereof. Background technique [0002] Chromium slag is discharged from metal chromium and chromium salt production projects. Chromium slag is a toxic solid waste with complex components, among which Cr 6+ Exist in water-soluble Na 2 Cr 2 o 7 and acid-soluble CaCrO 4 Among them, chromium slag is the main toxic component, which is highly corrosive and carcinogenic to the human body. my country's current stockpiled chromium slag is more than 6 million tons, and it is still increasing at a rate of hundreds of thousands of tons every year. A large amount of stockpiled chromium slag is washed away by rainwater. 6+ The formation of toxic waste water will cause serious pollution to soil, groundwater and rivers, lakes and seas. Therefore, the harmless treatment and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/04C03C6/10C03B19/02C03B32/02
CPCC03C10/0063C03B19/02C03B32/02C03C1/002C03C10/0009
Inventor 马冬阳边妙莲孙辉陈士朝吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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