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Method for purifying industrial by-product salts

A technology of industrial by-products and purification methods, which is applied to the purification of alkali metal halides and alkali metal chlorides, etc., and can solve the problem of easy adhesion of industrial by-product salts on the inner wall of incineration equipment, uneven heating of industrial by-product salts, and equipment Can not be used normally and other problems, to achieve the effect of low heating temperature, harmless treatment, fast reaction speed

Inactive Publication Date: 2019-12-13
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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Problems solved by technology

However, this method also has a series of problems in the actual application process. For example, the industrial by-product salt is easy to stick to the inner wall of the incineration equipment, causing the equipment to not work normally; the industrial by-product salt is not heated evenly, and the treatment efficiency is low.
Moreover, the method has a higher treatment temperature and higher requirements for incineration equipment, which increases the cost of the company's disposal of the waste.
[0005] Chlor-alkali industrial salt refers to sodium chloride, in which inorganic ammonia<1mg / L, total ammonia<4mg / L, and total organic carbon (TOC)<10ppm, the existing industrial by-product salt treatment methods cannot be efficiently and conveniently produced get the industrial salt

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  • Method for purifying industrial by-product salts

Examples

Experimental program
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Effect test

Embodiment 4

[0097] Embodiment 4 industrial by-product salt purification method

[0098] The difference from Example 1 is: the industrial by-product salt is ground and pulverized to 10 meshes; the stirring speed is 200 rpm; is 800°C. The aeration time was 5 minutes, and the product 4 was obtained # .

[0099] Embodiment 5 industrial by-product salt purification method

[0100] The difference from Example 1 is that the stirring speed is 50 rpm; the oxygen-enriched hot air is fed in at a volume ratio of hot air to oxygen of 1:0.1, and the temperature of the oxygen-enriched hot air is 650°C. Aeration time is 1 hour, product 5 is obtained # .

[0101] Embodiment 6 industrial by-product salt purification method

[0102] The difference with Example 1 is: the temperature of the oxygen hot air is 450°C, and the product 6 is obtained # .

[0103] The resulting product 1 # ~6 # The operating conditions are shown in Table 1.

[0104] Table 1

[0105]

Embodiment 7

[0106] Example 7 Product 1 # ~6 # Determination of inorganic ammonia content, total ammonia content and TOC (total organic carbon) content

[0107] The method for determining the content of inorganic ammonia is Nessler's reagent spectrophotometry. Ammonia nitrogen in the form of free ammonia or ammonium ions reacts with Nessler's reagent to form a light reddish-brown complex. The absorbance of the complex is proportional to the content of ammonia nitrogen. Absorbance was measured at a wavelength of 420 nm.

[0108] The determination method of total ammonia content is alkaline potassium persulfate digestion ultraviolet spectrophotometry. At 120-124 ° C, alkaline potassium persulfate solution converts the nitrogen of nitrogen-containing compounds in the sample into nitrate. Absorbance was measured at 220nm and 275nm, respectively.

[0109] The TOC content determination method is measured by a TOC analyzer. The total organic carbon in the sample is oxidized to carbon dioxide, ...

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Abstract

The invention discloses a method for purifying industrial by-product salts. The method comprises the steps: stirring an industrial by-product salt-containing raw material, and introducing oxygen-enriched hot air for contact of the industrial by-product salts with the oxygen-enriched hot air so as to obtain purified industrial salts. According to the method, the oxygen-enriched gas is introduced, the industrial by-product salts are stirred and heated, and easy sticking, caused by excessively-high heating temperatures, of the industrial by-product salts to the inner wall of an incineration device is avoided, and ammonia organic matter in the industrial by-product salts can be removed without melting of the industrial by-product salts.

Description

technical field [0001] The invention relates to a method for purifying industrial by-product salt, which belongs to the field of industrial by-product salt treatment. Background technique [0002] At present, because industrial by-product salt contains ammonium chloride and other ammonia organic substances, it cannot be directly used as a raw material for downstream products and is difficult to be effectively processed and utilized. Industrial by-product salt is an important basic chemical raw material and an extremely valuable national strategic resource. With the rapid development of the national economy, the output of various industrial by-product salts in chemical production is increasing, which poses a huge threat to the environment. In recent years, people's awareness of resource conservation and environmental friendliness has gradually increased, the government has significantly strengthened environmental protection legislation and law enforcement, and the treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D3/04
CPCC01D3/04C01D3/14
Inventor 谢奎叶灵婷
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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