A method for preparing environment-friendly carboxylate calcium magnesium salt deicing agent by using flue gas desulfurization waste

Abstract

The invention provides a method for preparing an environment-friendly carboxylic calcium magnesium salt snow-melting agent by using flue gas desulfation waste and belongs to the technical field of treatment of the flue gas desulfation waste and production of environment-friendly carboxylic calcium magnesium salt. The method comprises the following steps of: feeding the flue gas desulfation waste into a reactor; adding carboxylic acid; reacting for more than half an hour under the temperature of 60 to 110 DEG C to obtain a solution containing a small amount of solid insolubles; filtering; collecting the filtrate; adding activated carbon to the obtained filtrate to decolorize the obtained filtrate; and then concentrating the decolorized filtrate under the temperature of 70 to 120 DEG C to obtain the carboxylic calcium magnesium salt snow-melting agent. With the adoption of the method, the flue gas desulfation waste is effectively treated and the treated flue gas desulfation waste is used as the raw material of the carboxylic calcium magnesium salt snow-melting agent, and thus the production cost of the carboxylic calcium magnesium salt snow-melting agent is decreased.

Description

technical field

[0001] The invention relates to the technical field of production of an environment-friendly calcium magnesium carboxylate deicing agent, in particular to a method for preparing a calcium magnesium carboxylic acid deicing agent by using flue gas desulfurization industrial waste as production raw materials. Background technique

[0002] At present, using calcium and magnesium-rich hydroxides to desulfurize is one of the most commonly used methods in flue gas desulfurization technology. For example, the lime-gypsum method flue gas desulfurization technology is announced in the CN1281747 patent technology, and an improved flue gas desulfurization technology is announced in the patent CN101628199. Type magnesium flue gas desulfurization technology. When the flue gas desulfurization is carried out by the above method, a large amount of solid waste containing calcium and magnesium ions will be produced as a by-product, and the content of calcium and magnesium in th...

Examples

Embodiment 1

[0021] Put 100 g of flue gas desulfurization waste into the reaction kettle, and add 150 g of carboxylic acid. Under 1-1.5 atmospheric pressure, control the temperature of the reactor to 80°C for the reaction, and use 30% sodium hydroxide solution to absorb the acid gas generated during the reaction. After the reaction, the remaining solid-liquid mixture in the reactor was filtered. Collect the filtrate, decolorize it with activated carbon, then dry and concentrate the filtrate in an oven at 110°C for 3-5 days, then grind it to obtain the product. 60.5 g of product are obtained.

Embodiment 2

[0023] Put 80 g of flue gas desulfurization waste into the reaction kettle, and add 130 g of carboxylic acid. Under 1-1.5 atmospheric pressure, control the temperature of the reactor to 90°C for the reaction, and use 30% sodium hydroxide solution to absorb the acid gas in the reaction process. After the reaction, the remaining solid-liquid mixture in the reactor was filtered. Collect the filtrate, decolorize it with activated carbon, then dry and concentrate the filtrate in an oven at 105°C for 3 to 5 days, then grind it to obtain the product, and weigh 58.5g of the product.

Embodiment 3

[0024] Example 3: Put 150 g of flue gas desulfurization waste into a reaction kettle, and add 200 g of carboxylic acid. Under 1-1.5 atmospheric pressure, control the temperature of the reactor to 70°C for the reaction, and use 30% sodium hydroxide solution to absorb the acid gas in the reaction process. After the reaction, the remaining solid-liquid mixture in the reactor was filtered. Collect the filtrate, decolorize it with activated carbon, then dry and concentrate the filtrate in an oven at 100°C for 3-5 days, then grind it to obtain the product, and obtain 45.1 g of the product by weighing.

[0025] Application effect test of the present invention:

[0026] (1) Ice-melting ability

technical field

[0001] The invention relates to the technical field of production of an environment-friendly calcium magnesium carboxylate deicing agent, in particular to a method for preparing a calcium magnesium carboxylic acid deicing agent by using flue gas desulfurization industrial waste as production raw materials. Background technique

[0002] At present, using calcium and magnesium-rich hydroxides to desulfurize is one of the most commonly used methods in flue gas desulfurization technology. For example, the lime-gypsum method flue gas desulfurization technology is announced in the CN1281747 patent technology, and an improved flue gas desulfurization technology is announced in the patent CN101628199. Type magnesium flue gas desulfurization technology. When the flue gas desulfurization is carried out by the above method, a large amount of solid waste containing calcium and magnesium ions will be produced as a by-product, and the content of calcium and magnesium in th...

Examples

Embodiment 1

[0021] Put 100 g of flue gas desulfurization waste into the reaction kettle, and add 150 g of carboxylic acid. Under 1-1.5 atmospheric pressure, control the temperature of the reactor to 80°C for the reaction, and use 30% sodium hydroxide solution to absorb the acid gas generated during the reaction. After the reaction, the remaining solid-liquid mixture in the reactor was filtered. Collect the filtrate, decolorize it with activated carbon, then dry and concentrate the filtrate in an oven at 110°C for 3-5 days, then grind it to obtain the product. 60.5 g of product are obtained.

Embodiment 2

[0023] Put 80 g of flue gas desulfurization waste into the reaction kettle, and add 130 g of carboxylic acid. Under 1-1.5 atmospheric pressure, control the temperature of the reactor to 90°C for the reaction, and use 30% sodium hydroxide solution to absorb the acid gas in the reaction process. After the reaction, the remaining solid-liquid mixture in the reactor was filtered. Collect the filtrate, decolorize it with activated carbon, then dry and concentrate the filtrate in an oven at 105°C for 3 to 5 days, then grind it to obtain the product, and weigh 58.5g of the product.

Embodiment 3

[0024] Example 3: Put 150 g of flue gas desulfurization waste into a reaction kettle, and add 200 g of carboxylic acid. Under 1-1.5 atmospheric pressure, control the temperature of the reactor to 70°C for the reaction, and use 30% sodium hydroxide solution to absorb the acid gas in the reaction process. After the reaction, the remaining solid-liquid mixture in the reactor was filtered. Collect the filtrate, decolorize it with activated carbon, then dry and concentrate the filtrate in an oven at 100°C for 3-5 days, then grind it to obtain the product, and obtain 45.1 g of the product by weighing.

[0025] Application effect test of the present invention:

[0026] (1) Ice-melting ability

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