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High-thermal-intensity CaO carbon-containing pellets and preparation method and application thereof

A technology of carbon pellets and pellets, applied in the field of high thermal strength CaO carbon-containing pellets and its preparation, inorganic binders to improve the thermal strength of CaO carbon-containing pellets, can solve the problem of inconvenient operation and the strength of CaO carbon-containing pellets Reduce other problems and achieve the effect of saving production costs

Inactive Publication Date: 2016-08-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the calcium carbide slag needs to be modified with a modifier, which is not easy to operate; and it mainly uses an organic binder, which is easy to decompose in a high temperature environment, so that the CaO carbon-containing pellets The strength of the carbon-containing pellets is greatly reduced, so the strength of the CaO carbon-containing pellets prepared by it is up to 7.86MPa at 1000°C

Method used

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  • High-thermal-intensity CaO carbon-containing pellets and preparation method and application thereof
  • High-thermal-intensity CaO carbon-containing pellets and preparation method and application thereof
  • High-thermal-intensity CaO carbon-containing pellets and preparation method and application thereof

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Effect test

Embodiment 1

[0069] A CaO carbon-containing pellet, the CaO carbon-containing pellet is mainly prepared from the following raw materials in parts by weight:

[0070]

[0071] Among them, the inorganic binder is sulfuric acid. Carbon-containing powder is petroleum coke powder. The main component of calcium-based powder is calcium oxide. Carry out physical removal of impurities on calcium oxide (CaO purity greater than 90%), and then crush and sieve; use a sieve to sieve petroleum coke powder, and select petroleum coke powder and calcium oxide with a particle size of less than 200 μm and a purity greater than 90% as raw materials .

[0072] The preparation method of the CaO carbon-containing pellets comprises the steps of:

[0073] (1) Mix the above-mentioned calcium oxide and coke powder evenly, then add water, then add an inorganic binder and mix evenly;

[0074] (2) Put the mixed material into an inserting machine for cold pressing molding (molding pressure is 30MPa), get 15g of cy...

Embodiment 2

[0078] A CaO carbon-containing pellet, the CaO carbon-containing pellet is mainly prepared from the following raw materials in parts by weight:

[0079]

[0080] Among them, the inorganic binder is Ca(H 2 PO 4 ) 2 . The main component of calcium-based powder is calcium carbide slag, and the physical removal of impurities (Ca(OH) 2 The purity is greater than 95%), and then crushed and sieved to select calcium carbide slag with a particle size of less than 100 μm; sieve coke powder with a sieve, and select coke powder with a particle size of less than 200 μm and a purity greater than 89% as raw materials.

[0081] The preparation method of the CaO carbon-containing pellets comprises the steps of:

[0082] (1) Mix the above calcium carbide slag and coke powder evenly according to the mass ratio of 7:3, add water accounting for 25% of the weight of calcium carbide slag and coke powder, and then add inorganic binder accounting for 8% of the weight of calcium carbide slag and...

Embodiment 3

[0087] A CaO carbon-containing pellet, the CaO carbon-containing pellet is mainly prepared from the following raw materials in parts by weight:

[0088]

[0089] Among them, the inorganic binder is Ca 3 (PO 4 ) 2 . The main component of calcium-based powder is stone powder (CaCO 3 ), physically remove impurities (CaCO 3 The purity is greater than 90%), and then crushed and sieved; the coke powder is sieved with a sieve, and the coke powder and stone powder with a particle size of less than 150 μm and a purity greater than 90% are selected as raw materials.

[0090] The preparation method of the CaO carbon-containing pellets comprises the steps of:

[0091] (1) Mix the above-mentioned stone powder and coke powder according to the mass ratio of 6:4, add water accounting for 40% of the weight of stone powder and coke powder, and then add inorganic binder accounting for 4% of the weight of stone powder and coke powder and mix evenly ;

[0092] (2) Put the mixed material ...

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Abstract

The invention provides a high-heat-strength CaO carbon-containing pellet and its preparation method and application. The preparation method of the CaO carbon-containing pellet is: after mixing calcium-based powder, carbon-containing powder, inorganic binder and water The calcium-based carbon-containing pellets are obtained by cold pressing; the calcium-based carbon-containing pellets are optionally placed for a certain period of time, and then dried and calcined under control to obtain the CaO carbon-containing pellets. The thermal strength of the CaO carbon-containing pellets can reach up to 19Mpa at 1200°C, and can be greater than 10MPa at 1300°C; since the raw material is powder, the temperature for preparing calcium carbide is greatly reduced, and can be at 1800‑2000 ℃ to prepare calcium carbide; it solves the problem of large-scale recycling of solid waste in the coal chemical industry, and at the same time prepares high-performance and high-quality raw materials for calcium carbide production, reducing the energy consumption of calcium carbide production.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste in the coal chemical industry, and relates to a high-heat-strength CaO carbon-containing pellet and its preparation method and application, in particular to a method for increasing the thermal strength of CaO carbon-containing pellets by using an inorganic binder . Background technique [0002] Calcium-based powders include carbide slag (main component Ca(OH) 2 ), stone powder (main component CaCO 3 ), calcium oxide powder and other calcium-containing industrial solid waste. With the sustained and rapid development of my country's national economy, the scale of my country's PVC industry has grown rapidly, and its production capacity has increased from 17.8 million t / a in 2009 to 26.31 million t / a in 2014. Among them, calcium carbide slag is produced from calcium carbide process PVC. produced in the process. As of 2014, the production capacity of calcium carbide has r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C01B32/942
Inventor 公旭中王志王治帅王东汪玉华王明涌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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