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Refining method of industrial sodium chloride waste salt residues

A refining method and sodium chloride technology, which is applied in the purification of alkali metal chlorides and alkali metal halides, can solve the problems that the treatment process does not consider the purification of salt solution, increases the complexity of the treatment process, and is difficult to ensure the quality of product salt. , to achieve good heat treatment effect, good energy saving effect, and small secondary pollution

Inactive Publication Date: 2019-06-11
ZHEJIANG SHENLIAN ENVIRONMENTAL PROTECTION GRP CO LTD
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Problems solved by technology

This method has been dissolved twice, which increases the complexity of the treatment process and increases the energy consumption during the treatment process; the treatment process does not consider the purification of the salt solution, and industrial waste salt slag often contains impurities. When the salt solution contains When one or more metal ion impurities such as sulfate, phosphate, calcium and magnesium are used, the product salt obtained after using this method may still contain a certain amount of impurities, and it is difficult to ensure the quality of the product salt. It can only process some waste salt with extremely low content of soluble impurities, so this method also has certain limitations

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  • Refining method of industrial sodium chloride waste salt residues

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Effect test

Embodiment 1

[0045] The waste salt slag to be treated in this embodiment is pale yellow, containing 87.26% (wt%) of sodium chloride salt, 3.04% (wt%) of organic matter, 5.31% (wt%) of moisture, 0.45% (wt%) of metal impurities such as calcium and magnesium %), sulfate radical 3.6% (wt%), water-insoluble matter 0.32% (wt%), above-mentioned sodium chloride waste salt slag is after 300 ℃ of heat treatment 180min, dissolves with 60 ℃ of hot water, and the chlorine that obtains after filtering and purifying evaporates Sodium chloride content is 99.40% (wt%) in the sodium chloride product, and moisture is 0.31% (wt%), and water-insoluble matter is 0.06% (wt%), and the total amount of calcium and magnesium is 0.11% (wt%), and sulfate radical The content is 0.07% (wt%), reaching the first grade standard of refined industrial salt and industrial dry salt.

Embodiment 2

[0047] The waste salt to be treated in this embodiment is yellow-brown, containing 78.83% (wt%) of sodium chloride salt, 9.92% (wt%) of organic matter, 7.7% (wt%) of moisture, 0.33% (wt%) of metal impurities such as calcium and magnesium ), phosphate root 2.6% (wt%), water insoluble matter 0.59% (wt%), above-mentioned sodium chloride waste salt slag is after 550 ℃ of heat treatment 40min, dissolves with 80 ℃ of hot water, and the chlorination that obtains after filtering and purifying evaporation In the sodium product, the sodium chloride content is 99.35% (wt%), the moisture is 0.46% (wt%), the water insoluble matter is 0.06% (wt%), the total amount of calcium and magnesium is 0.08% (wt%), and the phosphate content It is 0.01% (wt%), reaching the first-class standard of industrial dry salt (industrial salt "GB / T5462-2015").

Embodiment 3

[0049] The waste salt slag to be treated in this embodiment is light brown, containing 71.33% (wt%) of sodium chloride salt, 9.73% (wt%) of organic matter, 10.5% (wt%) of moisture, 0.36% (wt%) of metal impurities such as calcium and magnesium %), sulfate radical 7.6% (wt%), water insoluble matter 0.41% (wt%), after above-mentioned sodium chloride waste salt slag 700 ℃ of heat treatment 20min, dissolve with 40 ℃ of hot water, filter and purify the chlorination that obtains after evaporation In the sodium product, the sodium chloride content is 99.41% (wt%), the moisture is 0.35% (wt%), the water insoluble matter is 0.05% (wt%), the total amount of calcium and magnesium is 0.07% (wt%), the sulfate content It is 0.06% (wt%), reaching the first-class standard of industrial dry salt (industrial salt "GB / T5462-2015").

[0050] The comparison between the method of this aspect and other processing schemes to process the product components is shown in Table 1.

[0051] Table 1 This me...

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Abstract

The invention discloses a refining method of industrial sodium chloride waste salt residues. The method comprises the following steps: firstly, carrying out pretreatment such as crushing and the likeon sodium chloride waste salt residues, carrying out heat treatment to remove organic matter, then adding hot water, carrying out stirring to completely dissolve soluble salt, then carrying out filtering, carrying out purification treatment on the obtained crude sodium chloride solution, and carrying out evaporative concentration, cooling crystallization and drying to obtain a sodium chloride product, wherein the evaporated distilled water is completely recycled for dissolving the salt residues after heat treatment. According to the method, the sodium chloride recovery rate reaches 98% or above, the sodium chloride content in the obtained sodium chloride product is up to 99% (wt%) or above, the impurity content is extremely low, and the obtained sodium chloride product reaches the first-grade standard or above of industrial dry salt and can be directly sold as a raw material in chlor-alkali and other industries. According to the method, harmless and resourceful treatment of the sodiumchloride waste salt residues is realized, remarkable economic benefits, environmental benefits and social benefits are achieved, and the purposes of completely recycling the sodium chloride salt resources, saving energy and protecting the environment are achieved, so that the method is an environment-friendly technology.

Description

technical field [0001] The invention belongs to the technical field of environmental protection resource regeneration, and in particular relates to a method for refining industrial sodium chloride waste salt slag. Background technique [0002] Many chemical products (especially pesticides, pharmaceuticals, fine chemicals, organic chemicals, dyes, etc.) produce a large amount of waste salt residue during the production process. The output is about 400,000 tons / year, that is, about 500,000 tons / year of industrial waste salt; about 10,000 tons / year of domestic production of furan phenol; about 500,000 tons / year of industrial waste salt in the production of epoxy resin , the amount of industrial waste salt slag produced by the above-mentioned industrial production is about 1.2 million tons per year, plus the waste salt slag that has not been treated in the past and the waste salt slag produced by the evaporation of high-salt wastewater in other industries, the total amount of in...

Claims

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Application Information

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IPC IPC(8): C01D3/14C01D3/04
Inventor 王治军彭秋燕郑细东叶标廖元双曾辉
Owner ZHEJIANG SHENLIAN ENVIRONMENTAL PROTECTION GRP CO LTD
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