阅读说明：本技术 工业副产氯化钠处置的方法 (Method for treating industrial byproduct sodium chloride ) 是由 张海滨 于 2019-11-17 设计创作，主要内容包括：本发明提供了一种工业副产氯化钠处置的方法,首先焚烧温度设定为400-1000℃；接着采用氢氧化钠等碱液溶解吸收,快速冷却为200℃以下,同时利用氢氧化钠能够将氯化铁、氯化铜、氯化铝变为沉淀物析出,进一步避免燃烧后形成氯苯等二噁英合成的前体；然后,次氯酸强氧化去除有机物杂质；最后过滤、结晶,得到基本纯净的工业氯化钠。本发明的装置包括焚烧炉、废气处置系统、固废处置系统,固废处置系统依次包括传输机构、溶解槽、氧化槽、脱色装置、过滤装置、结晶釜、干燥塔。本发明具有绿色环保、安全和资源化利用的多重功能,适合化工企业大规模生产应用。(The invention provides a method for treating industrial byproduct sodium chloride, which is characterized in that firstly, the incineration temperature is set to 400-1000 ℃; dissolving and absorbing by adopting alkali liquor such as sodium hydroxide and the like, rapidly cooling to below 200 ℃, simultaneously changing ferric chloride, copper chloride and aluminum chloride into precipitates by utilizing the sodium hydroxide to separate out, and further avoiding forming a precursor synthesized by dioxin such as chlorobenzene and the like after combustion; then, hypochlorous acid is strongly oxidized to remove organic impurities; finally, filtering and crystallizing to obtain the industrial sodium chloride with basically pure purity. The device comprises an incinerator, a waste gas treatment system and a solid waste treatment system, wherein the solid waste treatment system sequentially comprises a transmission mechanism, a dissolving tank, an oxidation tank, a decoloring device, a filtering device, a crystallization kettle and a drying tower. The invention has multiple functions of environmental protection, safety and resource utilization, and is suitable for large-scale production and application of chemical enterprises.)

1. A method for disposing industrial byproduct sodium chloride adopts the sequential treatment of incineration, dissolution and absorption, oxidation, filtration, crystallization and drying processes, and is characterized in that:

firstly, burning, wherein the temperature is set to 400-1000 ℃;

dissolving and absorbing with alkali solution such as sodium hydroxide, and rapidly cooling to below 200 deg.C;

then, oxidizing by a strong oxidant to remove organic impurities;

finally, the industrial sodium chloride which is basically pure is obtained through the processes of filtering, crystallizing and drying.

2. The method for disposing of industrial by-product sodium chloride according to claim 1, characterized in that: ferric chloride, cupric chloride and aluminum chloride are changed into precipitates by using sodium hydroxide to be separated out.

3. The method for disposing of industrial by-product sodium chloride according to claim 1, characterized in that: hypochlorous acid strong oxidant is adopted.

4. The method for disposing of industrial by-product sodium chloride according to claim 1, characterized in that: before filtering, activated carbon is adopted for decolorization treatment.

5. An apparatus adopting the method of claim 1, comprising an incinerator, a waste gas disposal system, and a solid waste disposal system, wherein: the top end of the incinerator is provided with an exhaust pipe, the exhaust pipe is connected with the waste gas disposal system, and the waste gas disposal system comprises an exhaust tank and an absorption tower; the bottom of the incinerator is provided with a discharge end, the discharge end is connected with the solid waste disposal system, and the solid waste disposal system comprises a transmission mechanism, a dissolving tank, an oxidation tank, a filtering device, a crystallization kettle and a drying tower which are sequentially connected from upstream to downstream; the alkali liquor tank is positioned above the absorption tower and the dissolving tank and is respectively connected with the absorption tower and the dissolving tank through pipelines; the hypochlorous acid tank is connected with the oxidation tank through a pipeline.

Technical Field

The invention relates to a purification technology of byproduct sodium chloride in chemical production.

Background

In the production of various chemical products, a large amount of by-product sodium chloride is generated, wherein various organic or inorganic impurities are doped, and the sodium chloride can be recycled only by purification or purification treatment.

The invention with the patent application number of 2018103381130 discloses a process for recycling industrial sodium chloride, which belongs to the field of solid waste recycling treatment, and comprises the steps of firstly utilizing stripped ammonia water generated in industrial production to dissolve industrial sodium chloride to prepare ammonia brine, then pertinently removing impurities such as metal ions, chromaticity, suspended matters and the like brought in the industrial production, introducing carbon dioxide into the pretreated ammonia brine to carry out two-phase reaction, and adjusting acid, evaporating, concentrating, cooling and crystallizing to obtain a byproduct ammonium chloride with the purity of more than 97 percent, so as to reach the use standard of agricultural ammonium chloride. The by-product of the method is not sodium chloride, and the recycling of the sodium chloride cannot be realized.

The invention with the patent application number of 2019101770105 discloses a method for refining industrial sodium chloride waste salt slag, wherein the sodium chloride waste salt slag is pretreated by crushing and the like, then is subjected to heat treatment to remove organic matters, then is added with hot water and stirred to completely dissolve soluble salt and then is filtered, the obtained sodium chloride crude salt solution is subjected to purification treatment, is subjected to evaporation concentration, cooling crystallization and drying to obtain a sodium chloride product, and the evaporated and distilled water is completely recycled for dissolving the salt slag after the heat treatment. The invention is a simple combination of the traditional technology, does not properly treat the waste gas and liquid generated in the treatment process, lacks creativity, and is difficult to obtain authorization.

Disclosure of Invention

The purpose of the invention is as follows:

the method for treating the industrial byproduct sodium chloride provided by the invention adopts the process sequences of incineration, dissolution and absorption, oxidation (or decoloration), filtration, crystallization, drying and the like.

The technical scheme is as follows:

firstly, the burning temperature is set to 400-;

then dissolving and absorbing by alkali liquor such as sodium hydroxide, and rapidly cooling to below 200 ℃, avoiding the temperature range (250-350 ℃) for synthesizing dioxin. Meanwhile, ferric chloride, copper chloride and aluminum chloride (which are catalysts required by chlorobenzene synthesis of a dioxin precursor) can be changed into precipitates by using sodium hydroxide to be separated out, and further precursors synthesized by dioxin such as chlorobenzene and the like after combustion are prevented from being formed.

Then, hypochlorous acid is strongly oxidized to remove organic impurities; the oxidability is strong, and chlorate is reduced into chloride ions, so that other impurities can not be brought.

Finally, the industrial sodium chloride which is basically pure is obtained through the technical treatment of decoloration (granular active carbon decoloration, non-powder can not be dissolved and is easy to filter and remove), filtration, crystallization, drying and the like by a mature technology.

The disposal system of the industrial byproduct sodium chloride comprises an incinerator, a waste gas disposal system and a solid waste disposal system, wherein an exhaust pipe is arranged at the top end of the incinerator and connected with the waste gas disposal system, and the waste gas disposal system comprises a tail gas tank and an absorption tower; the bottom of the incinerator is provided with a discharge end, the discharge end is connected with the solid waste disposal system, and the solid waste disposal system sequentially comprises a transmission mechanism, a dissolving tank, an oxidation tank, a decoloring device, a filtering device, a crystallization kettle and a drying tower from upstream to downstream; wherein the dissolving tank is connected with the oxidation tank through a thick slurry pump and a pipeline; the oxidation tank, the decoloring device, the filtering device, the crystallization kettle and the drying tower are connected through pipelines; the alkali liquor tank is positioned above the absorption tower and the dissolving tank and is respectively connected with the absorption tower and the dissolving tank through pipelines; the hypochlorous acid tank is connected with the oxidation tank through a pipeline.

Preferably, an interlayer is arranged in the dissolving tank and divides the dissolving tank into an upper part and a lower part, wherein the lower part is a sedimentation cavity.

Preferably, an activated carbon layer is arranged in the decoloring device, the filtering device is a nanofiltration device, and the lye tank is a sodium hydroxide solution tank.

Has the advantages that:

the invention has multiple functions of environmental protection, safety and resource utilization, and is suitable for large-scale production and application of chemical enterprises.

The device of the invention is provided with the tail gas tank, the absorption tower and the sodium hydroxide circulating spray structure, can effectively treat the acid waste gas generated after incineration, overcomes the defect that the waste gas is not treated in the prior art, and reduces the pollution of the waste gas to the environment.

The sodium hydroxide adopted in the device can change the ferric chloride, the copper chloride and the aluminum chloride into precipitates through reaction to be separated out, the ferric chloride, the copper chloride and the aluminum chloride are catalysts required by chlorobenzene synthesis of dioxin precursors, and further precursors for synthesizing dioxin such as chlorobenzene and the like are prevented from being formed after combustion. Then, removing organic impurities by strong oxidation of hypochlorous acid; and then the industrial sodium chloride is subjected to decolorization, filtration, crystallization, drying and other processes to obtain the basically pure industrial sodium chloride which can be reused as a byproduct without landfill, thereby avoiding the defects that in the prior art, a large amount of solid waste can not be utilized and can only be used for landfill due to difficult separation of toxic and harmful impurities such as dioxin and the like in the solid waste. The invention has multiple functions of environmental protection, safety and resource utilization, and is suitable for large-scale production and application of chemical enterprises.

Drawings

FIG. 1 is a schematic structural diagram of the present invention;

in the figure: 1-an incinerator; 2-tail gas tank; 3-an absorption column; 4-lye tank; 5-a pump; 6-a dissolving tank; 7-a sedimentation chamber; 8-filtering plate; 9-thick slurry pump; 10-an oxidation tank; 11-a decolorization device; 12-a filtration device; 13-crystallization kettle; 14-a drying tower; 15-an activated carbon layer; 16-a transport mechanism; 17-spraying mechanism.

Detailed Description