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Resourceful treatment method of waste salt

A treatment method and resource recovery technology, applied in the field of resource recovery of waste salt, can solve problems such as unconsidered state and environment, high cost and energy consumption, and low practicability, and achieve low cost and improved resource recovery , the effect of simple process

Active Publication Date: 2021-09-03
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only applicable to sodium sulfate without other interfering substances. It is a material preparation method and does not take into account factors such as the state of sodium sulfate and the environment in which it should be considered when it is actually applied to the recycling of sodium sulfate. Practicality Low
And also need to add promotor, cost and energy consumption are high, and the product that makes is sodium bicarbonate and ammonium sulfate

Method used

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  • Resourceful treatment method of waste salt
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Effect test

Embodiment 1

[0042] Such as figure 2 As shown, the waste salt recycling method of the present invention includes the following steps: mix waste salt and water according to equal mass, fully stir for 3 hours at a temperature of 80°C and a rotation speed of 227rpm to obtain waste salt water, and then use a cyclone The insoluble impurities are removed from the waste brine, and the ions that are easily soluble in water are separated and enriched by the method of filtration and water recycling to obtain mixed miscellaneous salts. Dissolve the mixed miscellaneous salt in water, the quality of the water is 2.5 times the mass of the mixed miscellaneous salt, stir at 35°C and 227rpm for 1h, filter to obtain the second filtrate, and slowly add the mass of the mixed miscellaneous salt to the second filtrate under the same conditions. Ammonium bicarbonate with 1.06 times the salt mass was reacted for 3 hours. The crude product of sodium bicarbonate and the third filtrate were obtained by filtration,...

Embodiment 2

[0045] The waste salt resource treatment method of the present invention comprises the following steps: mix waste salt and water according to a mass ratio of 1:1.25, fully stir for 3 hours at a temperature of 84°C and a rotation speed of 275rpm to obtain waste salt water, and then use a cyclone The insoluble impurities are removed from the waste brine, and the ions that are easily soluble in water are separated and enriched by the method of filtration and water recycling to obtain mixed miscellaneous salts. Dissolve the mixed miscellaneous salt in water, the quality of the water is 3.2 times the mass of the mixed miscellaneous salt, stir for 40min at a temperature of 37°C and a rotation speed of 200rpm, filter to obtain the second filtrate, and slowly add the mass of Mix ammonium bicarbonate 1.20 times the mass of the miscellaneous salt and react for 2.5 hours. The crude product of sodium bicarbonate and the third filtrate were obtained by filtration. Under the heating and sti...

Embodiment 3

[0048] The recycling treatment method of waste salt of the present invention comprises the following steps:

[0049] Mix the waste salt and water according to the mass ratio of 1:1.1, fully stir for 2.1 hours at a temperature of 85°C and a rotation speed of 350rpm to obtain waste salt water, and then use a cyclone to remove insoluble impurities in the waste salt water, and use filtration and circulation Water-soluble ions are separated and enriched to obtain mixed miscellaneous salts. Dissolve the mixed miscellaneous salt in water, the quality of the water is 4 times the mass of the mixed miscellaneous salt, stir at a temperature of 35°C and a rotation speed of 250rpm for 0.5h, filter to obtain the second filtrate, and slowly add mass to the second filtrate under the same conditions Ammonium bicarbonate, which is 1.06 times the mass of the mixed miscellaneous salts, was reacted for 3 hours. The crude product of sodium bicarbonate and the third filtrate were obtained by filtra...

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Abstract

The invention discloses a resourceful treatment method of waste salt. The method comprises the following steps: S1, a waste salt pretreatment stage: removing insoluble impurities in waste salt, and separating and enriching water-soluble ions to obtain mixed hybrid salt mainly comprising sodium sulfate and sodium chloride; S2, a double decomposition stage: carrying out double decomposition reaction on the mixed hybrid salt; S3, filtering a metathesis mixed solution obtained by the metathesis reaction, and collecting filter cake obtained by filtering to enter a sodium bicarbonate preparation stage; and S4, an ammonium salt preparation stage. The waste salt mainly containing sodium chloride and sodium sulfate is subjected to resourceful treatment, industrial sodium bicarbonate and ammonium salt products are obtained, so that resourceful treatment of the waste salt is greatly improved. The method is simple in process and low in cost, the utilization rate of the waste salt is 84%-89%, the purity of the prepared product sodium bicarbonate is 94%-96%, and the nitrogen content (on a dry basis) in the ammonium salt is greater than or equal to 23.8%.

Description

technical field [0001] The invention relates to the technical field of solid waste, in particular to a method for recycling waste salt. Background technique [0002] Waste salt is a solid waste produced in the process of wastewater treatment in chemical, metallurgical and biomedical industries, with a huge output. This kind of solid waste is currently mainly used to prepare sodium sulfate and sodium chloride through salt separation, which has low added value and small market demand, especially in smelting, petrochemical, coal chemical and biomedical industries. The waste salt produced is listed as hazardous waste by the state. , is extremely difficult to use and cannot be reduced through the market. It is mainly stockpiled, causing huge economic burdens and environmental hazards, and has become an important bottleneck restricting the industry's green upgrading and sustainable development. Therefore, it is meaningful to realize the resource utilization of waste salt major. ...

Claims

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Application Information

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IPC IPC(8): C01D7/10C01C1/16C01C1/244
CPCC01D7/10C01C1/162C01C1/244C01P2006/80
Inventor 李云芳王洪亮周凤翔
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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