Calcium carbide purified ash treatment method and device

A treatment method and technology for purifying ash, which are applied in the directions of cement production and process efficiency improvement, etc., can solve the problems of not dealing with the magnesium content of purified ash, air pollution of combustion gas, adverse effects of cement, etc.

Active Publication Date: 2021-04-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, this technology uses air and purified ash to be mixed and injected, and then combusted. This process will not only produce combustion gas that pollutes the air, but also does not remove the magnesium content in the purified ash, such as raw materials for cement production. , it also has an adverse effect on cement

Method used

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  • Calcium carbide purified ash treatment method and device
  • Calcium carbide purified ash treatment method and device

Examples

Experimental program
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Effect test

Embodiment approach

[0044] As an implementation manner of the examples of the present invention, the mixture of calcium carbide purified ash, reducing agent and catalyst to obtain a mixture includes:

[0045] The calcium carbide purified ash, reducing agent and catalyst are mixed and pelletized to obtain a mixture with a particle size of 20-40mm.

[0046] Ball making can increase the effective contact area between raw materials, provide the kinetic conditions of reduction reaction, promote the reduction reaction, shorten the reduction reaction time, and improve production efficiency; and the ball will not loose after the reaction is over, so the reduction reaction process The gaps between the balls provide channels for the diffusion of magnesium vapor generated by reduction, which is beneficial to the collection of magnesium vapor. By making balls, the shape of the obtained mixture may be spherical, ellipsoidal, or apricot-shaped, so the particle size here can be understood as the maximum length ...

Embodiment 1

[0064] Embodiment 1 provides a kind of processing method of calcium carbide purification ash, specifically as follows:

[0065] The composition (mass fraction) is MgO: 37.36%, CaO: 40.9%, SiO 2 : 8.12%, the rest is purified ash of impurities, combined with quicklime obtained by calcining limestone, standard 75# ferrosilicon, CaF 2 The mass fraction is 95% fluorite, and the mass ratio is 100:30:18:1, and then evenly mixed to make a 40x25x12mm almond-shaped pellet mixture. Put 200kg of mixed material in a φ350x4000mm reduction tank and seal it; use the electric heating cylinder coil to heat the reduction tank to 1180°C, and at the same time use a vacuum unit to evacuate the inside of the reduction tank. Up to 28.6kg metal magnesium and 167kg dicalcium silicate (2CaO·SiO 2 ) main component of the reduction slag, the reduction slag is used to make cement, and metal magnesium is reused.

Embodiment 2

[0067] Embodiment 2 provides a kind of processing method of calcium carbide purification ash, specifically as follows:

[0068] The composition (mass fraction) is MgO: 35.58%, CaO: 44.69%, SiO 2 : 9.6%, the rest is purified ash of impurities, combined with quicklime obtained by calcining limestone, standard 75# ferrosilicon, CaF 2 The mass fraction is 95% fluorite, and the batching ratio is 99:26:17:1.2, and then evenly mixed to make a 40x25x12mm apricot core pellet mixture. Put 200kg of mixed material into a φ350x4000mm reduction tank and seal it; use the electric heating cylinder coil to heat the reduction tank to 1190°C, and at the same time use a vacuum unit to evacuate the inside of the reduction tank. The vacuum degree is controlled at 15Pa, and the reduction is kept for 9 hours. 28.1kg metal magnesium and 169kg dicalcium silicate (2CaO·SiO 2 ) main component of the reduction slag, the reduction slag is used to make cement, and metal magnesium is reused.

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Abstract

The invention belongs to the technical field of calcium carbide production, and particularly relates to a calcium carbide purified ash treatment method and device. The calcium carbide purified ash treatment method comprises the steps that calcium carbide purified ash, a reducing agent and a catalyst are mixed, and a mixture is obtained; and the mixture is heated under the vacuum condition that the pressure intensity is less than or equal to 15Pa until the temperature is more than or equal to 1150 DEG C, and reduction reaction is carried out for more than or equal to 8h to obtain magnesium vapor and reducing slag. No liquid needs to be added in the reaction process, the magnesium vapor is generated through reduction treatment, and solid magnesium can be obtained through collection; meanwhile, the reduction reaction reducing slag can be used as a raw material of cement or a raw material of a refractory material according to the types of reaction products, so that recycling of the purified ash is realized, and green and environment-friendly treatment of the purified ash in calcium carbide production is realized; and the process is simple, low in cost and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of calcium carbide production, and in particular relates to a calcium carbide purification ash treatment method and device. Background technique [0002] Calcium carbide purification ash is produced in the process of calcium carbide, followed by about 400m 3 / t tail gas of calcium carbide, the solid dust collected after the tail gas is cooled and dedusted is mainly composed of CaO, MgO and SiO 2 and other compositions, through phase composition and chemical composition analysis, it shows that the content of CaO is 40-45%, the content of MgO is 35-40%, and the content of SiO 2 The content is 8-10%. According to statistics, the annual output of purified ash in calcium carbide production accounts for about 5% to 7% of the calcium carbide output. For example, a calcium carbide enterprise with an annual output of 1 million tons discharges 50,000 to 70,000 tons of purified ash every year, nearly 200 tons per day...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B5/04C22B5/10C22B26/22C04B7/24C04B35/66
CPCC22B7/02C22B7/001C22B5/04C22B5/10C22B26/22C04B7/24C04B35/66Y02P10/20Y02P40/10
Inventor 褚丙武李峰李波赵秀峰刘静
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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