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A method for removing organic matter in inorganic salts

A technology of organic matter and inorganic salt, applied in the direction of calcium/strontium/barium chloride, alkali metal halide purification, calcium/strontium/barium halide, etc., can solve the problem of excessive organic matter residue, liquid salt penetration, low heat transfer efficiency, etc. problems, to achieve the effect of shallow liquid level, prevent caking, and high heat transfer efficiency

Active Publication Date: 2019-07-12
南京诚朴环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to provide a method for removing organic matter in inorganic salts, efficiently cracking and oxidizing organic matter in inorganic salts, to solve the problem of easy bonding of salts, incomplete cracking, and organic matter when using existing technologies to process inorganic salts containing organic matter. Many residues, liquid salt penetration, and low heat transfer efficiency

Method used

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  • A method for removing organic matter in inorganic salts
  • A method for removing organic matter in inorganic salts

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The inorganic salt containing organic matter used in this example is taken from the salt evaporated and crystallized by a pesticide company in Anhui. It contains a large amount of organic matter residue, the content is 450mg / kg, especially contains a part of organic chloride (dioxin), Among them, the organic chloride content is 50mg / kg, and the waste salt is a typical hazardous waste salt.

[0041] The method for removing organic matter in inorganic salts comprises the following steps:

[0042] 1) The above waste salt was heated to 600°C by hot air in the rotary kiln 1 for cracking and oxidation, and the residence time at 600°C was 85 minutes to obtain gray solid salt. During this process, no salt cohesion was found. The content of organic matter in the solid salt after step cracking is 12.5mg / kg, and the content of dioxin is 4.5μg / kg. , so the salt treated in this step is still hazardous waste salt.

[0043]2) Put the cracked high-temperature solid salt into the molt...

Embodiment 2

[0045] The inorganic salt containing organic matter used in this example is taken from the salt evaporated and crystallized by a pesticide company in Shandong. It contains a large amount of organic matter residues, and the organic matter content is 680mg / kg, especially containing a part of organic chlorides (dioxins). , wherein the organic chloride content is 120mg / kg, waste salt is a typical hazardous waste salt.

[0046] The method for removing organic matter in inorganic salts comprises the following steps:

[0047] 1) Heat the above waste salt in the rotary kiln to 650°C with hot air for cracking and oxidation. The residence time at 650°C is 90 minutes to obtain gray solid salt. No salt caking was found during the operation. This step The content of organic matter in the cracked solid salt is 11.4 mg / kg, and the content of dioxin is 2.5 μg / kg. Although the content of organic matter in the salt has reached the standard for chlor-alkali salt, because it contains a small amou...

Embodiment 3

[0050] The inorganic salt containing organic matter in this example is taken from the salt obtained from the evaporation and crystallization of the pesticide chlorpyrifos wastewater, and contains a large amount of organic matter residue, wherein the organic matter content is 545mg / kg, especially containing a part of organic chloride (dioxin), Among them, the organic chloride content is 248mg / kg, and the waste salt is a typical hazardous waste salt.

[0051] The method for removing organic matter in inorganic salts comprises the following steps:

[0052] 1) Heat the above waste salt to 650°C with hot air in a stirred cracking furnace for cracking and oxidation, and the residence time at 650°C is 120 minutes to obtain gray solid salt. No salt sticking was found during the operation. The content of organic matter in the solid salt cracked in this step is 5.4 mg / kg, and the content of dioxin is 2.6 μg / kg. Although the content of organic matter in the salt has reached the standard ...

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Abstract

The invention discloses a method for removing organic matters in inorganic salt. The method comprises the following steps: 1) cracking solid-state salt containing organic matter impurities under temperature less than a salt melting point and adding the cracked solid-state salt into a salt melting furnace; 2) heating to melt the solid-state salt into liquid-state salt; enabling the solid-state salt to flow through a plurality of containers arranged in high-temperature hot gas, so as to enable the high-temperature hot gas to be in direct contact with a liquid surface of the liquid-state salt in the containers; heating the liquid-state salt through the liquid surface of the liquid-state salt and container walls and cracking or oxidizing to remove the organic matters in the liquid-state salt; discharging the organic matters from a discharging hole. By adopting the method disclosed by the invention, the problems that the solid-state salt is caked and equipment is blocked are effectively solved; heat for melting the solid-state salt is also reduced and industrialized production is easy to realize; the permeation of the liquid-state salt is avoided; the method has the advantages of simple process, high heat transferring efficiency, capability of completely cracking the organic matters, reliability in operation, low cost, less waste gas amount, safety, simple structure and the like.

Description

technical field [0001] The invention relates to the technical field of salt melting and impurity removal, in particular to a method for removing organic matter in inorganic salts. Background technique [0002] A large amount of inorganic salts containing organic matter are often produced in chemical production, which cannot be directly used as industrial raw materials. At present, there are two common methods for processing this kind of salt. One is to decompose the organic matter in the salt by high-temperature calcination at a temperature lower than the melting point of the salt. In particular, dioxins will remain in a large amount of salt, resulting in that the salt treated by this type of treatment method cannot be directly used as industrial raw materials; the second is to carry out high-temperature cracking and oxidation of organic matter in the salt at a temperature higher than the melting point of the salt, that is, to use melting However, the existing technology is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/20C01F11/32C01D5/16
CPCC01D3/20C01D5/16C01F11/32Y02P20/10
Inventor 洪磊
Owner 南京诚朴环保科技有限公司
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