A kind of full resource treatment method of sodium sulfate salt slag

A treatment method and technology of sodium sulfate, applied in chemical instruments and methods, alkali metal sulfite/sulfate purification, solid waste removal, etc., can solve the problem of difficulty in producing pure white sodium sulfate crystals, slow treatment process, and investment costs. Large and other problems, to achieve the effect of thorough purification, large processing capacity and simple process

Active Publication Date: 2022-03-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of medium and low temperature, the harmful impurities of organic matter are thermally decomposed into volatile tail gas and separated from the solid salt to achieve harmless treatment, but the decomposed solid components remain on the surface of the solid salt, making it difficult to produce pure white sodium sulfate crystals
The processing process is slow, and it has the disadvantages of high investment cost, low efficiency and small output in industrial production

Method used

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  • A kind of full resource treatment method of sodium sulfate salt slag
  • A kind of full resource treatment method of sodium sulfate salt slag
  • A kind of full resource treatment method of sodium sulfate salt slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 5g of sodium sulfate salt slag produced by the H acid process in a crucible, put it into a muffle furnace and roast for 2 hours at a roasting temperature of 250°C; dissolve the roasted solids in 20mL of water and stir with a magnetic force Stir until the salt mud is completely dissolved;

[0028] (2) Add 15 mL of n-hexane and 0.01 g of sodium oleate to the solution in step (1) while stirring, continue to stir and mix for a period of time, and let it stand still, and the liquid surface is clearly stratified;

[0029] (3) Use a separatory funnel to separate the layered solution. The upper layer solution is centrifuged at 6000r / min for 8 minutes to separate and recover the black particulate carbon material. The remaining solution is evaporated at 50°C to recover the extractant; the lower layer solution is evaporated at 80°C for 4h to recrystallize. Recovery and purification of sodium sulfate.

[0030] This embodiment handles 5g H acid process sodium sulfate salt...

Embodiment 2

[0032] (1) Weigh 5g of sodium sulfate salt slag produced by the H acid process in a crucible, put it into a muffle furnace and roast for 2 hours at a temperature of 350°C; dissolve the roasted solids in 20mL of water and stir with a magnetic force Stir until the salt mud is completely dissolved;

[0033] (2) Add 10 mL of n-hexane and 0.01 g of sodium oleate to the solution in step (1) while stirring, continue to stir and mix for a period of time, and let it stand still, and the liquid surface is clearly stratified;

[0034] (3) Use a separatory funnel to separate the layered solution. The upper layer solution is centrifuged at 7000r / min for 6 minutes to separate and recover the black particulate carbon material. The remaining solution is evaporated at 80°C to recover the extractant; the lower layer solution is evaporated at 100°C for 3h to recrystallize. Recovery and purification of sodium sulfate.

[0035] This embodiment handles 5g H acid process sodium sulfate salt slag, h...

Embodiment 3

[0037] (1) Weigh 5g of the sodium sulfate salt slag produced by the H acid process in a crucible, put it into a muffle furnace and roast for 2 hours at a roasting temperature of 400°C; dissolve the roasted solids in 20mL of water and stir with a magnetic force Stir until the salt mud is completely dissolved;

[0038] (2) Add 10 mL of n-hexane and 0.01 g of sodium oleate to the solution in step (1) while stirring, continue to stir and mix for a period of time, and let it stand still, and the liquid surface is clearly stratified;

[0039] (3) Use a separatory funnel to separate the layered solution. The upper layer solution is centrifuged at 8000r / min for 5 minutes to separate and recover the black particulate carbon material. The remaining solution is evaporated at 100°C to recover the extractant; the lower layer solution is evaporated at 120°C for 2h to recrystallize. Recovery and purification of sodium sulfate.

[0040] This embodiment handles 5g H acid process sodium sulfat...

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Abstract

The invention belongs to the technical field of industrial solid waste treatment, and discloses a full resource treatment method of sodium sulfate salt slag. Roasting the sodium sulfate salt residue at a temperature of 250-600°C, then adding water to stir and dissolve; adding an extraction agent and an interface regulator to the obtained solution under stirring conditions, stirring and mixing, standing for stratification, and separating to obtain upper and lower layer solutions; The upper layer solution obtained in the step is centrifuged to obtain a solid carbon material, and the remaining solution is evaporated to recover the extractant; the lower layer solution is evaporated and recrystallized to recover sodium sulfate. The method of the invention has the advantages of simple process, low cost, quick effect, large processing capacity, thorough purification, and full resource utilization of sodium sulfate salt slag.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste treatment, and in particular relates to a full resource treatment method of sodium sulfate salt slag. Background technique [0002] In many chemical production processes, a large amount of by-product waste sodium sulfate slag containing organic matter, tar and other toxic and harmful substances will be produced. However, because it contains toxic and harmful substances such as organic tar, high moisture content, and easy to harden, it cannot be directly used as industrial raw materials, and its disposal is difficult and expensive. Many companies use warehouse storage, open storage, or direct storage in rivers and other places. , causing the warehouse to occupy a large amount of land or destroy the soil, deteriorate the water quality, pollute the environment, and cause serious danger to the living environment and physical and mental health of the surrounding people. Therefore, how t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/40B09B3/80C01D5/16C01B32/15
CPCC01B32/15C01D5/16B09B3/00B09B3/80B09B3/40
Inventor 刘学明林璋宿新泰邱郴周含峰任雪樵
Owner SOUTH CHINA UNIV OF TECH
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