CN112642837A - Resource utilization method of SDS (sodium dodecyl sulfate) desulfurization waste residues - Google Patents

Resource utilization method of SDS (sodium dodecyl sulfate) desulfurization waste residues Download PDF

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Publication number
CN112642837A
CN112642837A CN202011406403.8A CN202011406403A CN112642837A CN 112642837 A CN112642837 A CN 112642837A CN 202011406403 A CN202011406403 A CN 202011406403A CN 112642837 A CN112642837 A CN 112642837A
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China
Prior art keywords
waste residue
sds
resource utilization
desulfurization waste
filtrate
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CN202011406403.8A
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Chinese (zh)
Inventor
邵国庆
任艳丽
曾冠武
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Pangang Group Research Institute Co Ltd
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Pangang Group Research Institute Co Ltd
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Priority to CN202011406403.8A priority Critical patent/CN112642837A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B3/00Destroying solid waste or transforming solid waste into something useful or harmless
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B5/00Operations not covered by a single other subclass or by a single other group in this subclass

Abstract

The invention discloses a resource utilization method of SDS (sodium dodecyl sulfate) desulfurization waste residues, belonging to the technical field of solid waste resource utilization. The invention provides a resource utilization method of SDS (sodium dodecyl sulfate) desulfurized waste residue for realizing the comprehensive utilization of the SDS desulfurized waste residue resources, which comprises the following steps of: fully mixing the desulfurization waste residue with water, and filtering and washing to obtain a filter cake and a filtrate; drying the filter cake, and using the iron-back smelting system as fuel; and adjusting the pH value of the filtrate to 6.5-7.5, and then carrying out evaporative crystallization on the filtrate to obtain sodium sulfate. The whole process of the invention does not generate three wastes, the obtained free carbon can be returned to an iron-making system to be used as fuel, the purity of the sodium sulfate reaches the requirement of III products in industrial anhydrous sodium sulfate in GB/T6009-2014, and the high-valued and resource utilization of the SDS desulfurization waste residue is realized.

Description

Resource utilization method of SDS (sodium dodecyl sulfate) desulfurization waste residues
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a resource utilization method of SDS (sodium dodecyl sulfate) desulfurization waste residues.
Background
The SDS dry desulfurizing and spraying technology is that high-efficiency desulfurizing agent (grain size 20-25 microns) is sprayed into pipeline uniformly, and the desulfurizing agent is heated and activated in the pipeline and makes chemical reaction, so that the specific surface area is quickly increased, and the desulfurizing agent is fully contacted with acid flue gas and makes physical and chemical reactionReaction, SO in flue gas2And acidic substances such as HCl, HF and the like are absorbed and purified, and finally a large amount of desulfurization waste residues are formed.
At present, the desulfurization waste residues are mainly stockpiled or outsourcing treated, and the large amount of stockpiled desulfurization waste residues influence the ecological environment and the safe operation of a power plant, so that the recycling of the desulfurization gypsum is a problem which needs to be solved urgently.
200810198156.X discloses a method for producing potassium sulfate by utilizing desulfurized waste residue, which comprises the steps of fully mixing 10-90% of desulfurized waste residue and 10-90% of potassium layer stone powder in percentage by weight, and then calcining at the temperature of 600-1800 ℃ for 0.25-2 hours to obtain the potassium sulfate. However, the method does not recycle a large amount of carbon and sodium contained in the desulfurization waste residue, thereby causing resource waste.
Disclosure of Invention
The invention provides a resource utilization method of SDS (sodium dodecyl sulfate) desulfurized waste residue for realizing the comprehensive utilization of the SDS desulfurized waste residue resources, which comprises the following steps of:
A. fully mixing the desulfurization waste residue with water, and filtering and washing to obtain a filter cake and a filtrate;
B. drying the filter cake, and using the iron-back smelting system as fuel;
C. and adjusting the pH value of the filtrate to 6.5-7.5, and then carrying out evaporative crystallization on the filtrate to obtain sodium sulfate.
In the method for recycling the SDS desulfurization waste residue, in the step A, the desulfurization waste residue is obtained by desulfurization by an SDS method, and comprises the following components: na (Na)2SO475-85 wt% and C10-15 wt%.
In the method for recycling the SDS desulfurization waste residue, in the step A, the mass ratio of the desulfurization waste residue to water is 1: 3 to 1.
In the method for recycling the SDS desulfurization waste residue, in the step A, vacuum belt type filtration is adopted, water is sprayed to wash the upper part of a belt type filter for 1-3 times, and the mass ratio of water to the desulfurization waste residue is 0.1-5: 1.
in the method for recycling the SDS desulfurization waste residue, in the step B, the free carbon content of the filter cake is not lower than 88 tw% after the filter cake is dried.
In the method for recycling the SDS desulfurization waste residue, in the step C, dilute sulfuric acid with the pH of 1-2 is used for adjusting the pH of the filtrate.
In the method for recycling the SDS desulfurization waste residue, in the step C, the purity of the obtained sodium sulfate is 92-96%.
The invention has the beneficial effects that:
according to the invention, the SDS desulfurization waste residue is subjected to resource comprehensive utilization, water can realize internal circulation, three wastes are not generated in the whole process, the obtained free carbon can be returned to an iron-making system to be used as a fuel, the purity of sodium sulfate reaches the requirement of III products in industrial anhydrous sodium sulfate in GB/T6009-2014, and high-valued and resource utilization of the SDS desulfurization waste residue is realized.
Drawings
FIG. 1 is a process flow diagram of the resource utilization of SDS desulfurization waste residue.
Detailed Description
Specifically, the SDS desulfurization waste residue resource utilization method comprises the following steps:
A. fully mixing the desulfurization waste residue with water, and filtering and washing to obtain a filter cake and a filtrate;
B. drying the filter cake, and using the iron-back smelting system as fuel;
C. and adjusting the pH value of the filtrate to 6.5-7.5, and then carrying out evaporative crystallization on the filtrate to obtain sodium sulfate.
In the method, the desulfurized waste residue is obtained after being desulfurized by an SDS method, and contains Na2SO475-85 wt% and C10-15 wt%; in addition, it also contains Cl 1-1.5 wt%, Na2CO33 to 5 wt% of other components.
In step A of the method, in order to improve the purity and yield of the sodium sulfate, the mass ratio of the desulfurization waste residue to the water is controlled to be 1: 3 to 1.
In the step A of the method, vacuum belt type filtration is adopted, water is sprayed on the upper part of a belt type filter for washing for 1-3 times, and the mass ratio of water to the desulfurization waste residue is 0.1-0.5: 1; conventional filtration devices, while also suitable, are inefficient.
In the step B of the method, the content of free carbon in the filter cake is not less than 88 tw% after the filter cake is dried, so that the filter cake can be directly returned to an iron making system to be used as fuel.
In the step C of the method, dilute sulfuric acid with the pH of 1-2 is adopted to adjust the pH of the filtrate, so that impurities are prevented from being introduced, and the recovery rate of sodium is improved.
In the step C of the method, the purity of the obtained sodium sulfate is 92-96%.
According to the method, the filtrate obtained by filtering after washing in the step A and the liquid obtained by evaporation and crystallization in the step C can be returned to the step A and mixed with the desulfurization waste residue, so that internal circulation of water is realized, and basically no wastewater is generated.
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
In the embodiment, the components of the SDS desulfurization waste residue are as follows: na (Na)2SO4 81.5wt%,C 12.3wt%,Cl 1.4wt%,Na2CO3 4.8wt%。
Example 1
Mixing the desulfurization waste residue and water according to the mass ratio of 1: 3, after fully mixing, carrying out vacuum belt type filtration, and carrying out water spraying washing on the upper part of a belt type filter for 3 times (the mass ratio of washing water to desulfurization waste residue is 0.2: 1 each time) to obtain a filter cake and a filtrate; drying or naturally airing the filter cake, determining that the content of free carbon is 91.7 wt%, the recovery rate of C in the desulfurization waste residue is 91%, and using a back iron smelting system as fuel; the pH of the filtrate is adjusted to be 7 by dilute sulfuric acid with the pH of 1-2, and the purity of the obtained sodium sulfate is 93.4% after evaporation and crystallization, so that the requirement of III products in industrial anhydrous sodium sulfate in GB/T6009-2014 is met, and the recovery rate of sodium sulfate in the desulfurization waste residue is 89%.
Example 2
Mixing the desulfurization waste residue and water according to a liquid-solid ratio of 1: 1, fully mixing, filtering by adopting a vacuum belt filter, and washing by spraying water on the upper part of the belt filter for 3 times (the mass ratio of washing water to desulfurization waste residue is 0.2: 1 each time) to obtain a filter cake and a filtrate; drying or naturally airing the filter cake, determining that the content of free carbon is 90.2 wt%, the recovery rate of C in the desulfurization waste residue is 93%, and using the iron-back smelting system as fuel; the pH of the filtrate is adjusted to be 7 by dilute sulfuric acid with the pH of 1-2, the purity of the obtained sodium sulfate is 92.3% after evaporation and crystallization, the requirement of III products in industrial anhydrous sodium sulfate in GB/T6009-2014 is met, and the recovery rate of sodium sulfate in the desulfurization waste residue is 95%.
Example 3
Mixing the desulfurization waste residue with water according to a liquid-solid ratio of 3: 1, after fully mixing, carrying out vacuum belt type filtration, and carrying out water spraying washing on the upper part of a belt type filter for 1 time (the mass ratio of washing water to desulfurization waste residue is 0.2: 1 each time), so as to obtain a filter cake and a filtrate; the filter cake is dried or naturally aired, the content of free carbon is 89.5 wt% by determination, the recovery rate of C in the desulfurization waste residue is 94%, and the iron-returning system is used as fuel; the pH of the filtrate is adjusted to be 7 by dilute sulfuric acid with the pH of 1-2, and the purity of the obtained sodium sulfate is 92.8% after evaporation and crystallization, so that the requirement of III products in industrial anhydrous sodium sulfate in GB/T6009-2014 is met, and the recovery rate of sodium sulfate in the desulfurization waste residue is 92%.
Example 4
Mixing the desulfurization waste residue and water according to a liquid-solid ratio of 1: 1, after fully mixing, carrying out vacuum belt type filtration, and carrying out water spraying washing on the upper part of a belt type filter for 1 time (the mass ratio of washing water to desulfurization waste residue is 0.2: 1 each time), so as to obtain a filter cake and a filtrate; drying or naturally airing the filter cake, determining that the content of free carbon is 88.9 wt%, the recovery rate of C in the desulfurization waste residue is 96%, and using the iron-back smelting system as fuel; the pH of the filtrate is adjusted to be 7 by dilute sulfuric acid with the pH of 1-2, and the purity of the obtained sodium sulfate is 93.1% through evaporation and crystallization, so that the requirement of III products in industrial anhydrous sodium sulfate in GB/T6009-2014 is met, and the recovery rate of sodium sulfate in the desulfurization waste residue is 93%.

Claims (7)

  1. The method for recycling the SDS desulfurization waste residue is characterized by comprising the following steps: the method comprises the following steps:
    A. fully mixing the desulfurization waste residue with water, and filtering and washing to obtain a filter cake and a filtrate;
    B. drying the filter cake, and using the iron-back smelting system as fuel;
    C. and adjusting the pH value of the filtrate to 6.5-7.5, filtering, and then carrying out evaporative crystallization on the filtrate to obtain sodium sulfate.
  2. 2. The SDS desulfurized waste residue resource utilization method according to claim 1, characterized in that: in the step A, the desulfurized waste residue is obtained by desulfurization by an SDS method, and contains: na (Na)2SO475-85 wt% and C10-15 wt%.
  3. 3. The SDS desulfurized waste residue resource utilization method according to claim 1, characterized in that: in the step A, the mass ratio of the desulfurization waste residue to water is 1: 3 to 1.
  4. 4. The SDS desulfurized waste residue resource utilization method according to claim 1, characterized in that: in the step A, vacuum belt type filtration is adopted, water is sprayed on the upper part of a belt type filter for washing for 1-3 times, and the mass ratio of water to the desulfurization waste residue is 0.1-0.5: 1.
  5. 5. the SDS desulfurized waste residue resource utilization method according to claim 1, characterized in that: in step B, after the filter cake is dried, the content of free carbon is not less than 88 tw%.
  6. 6. The SDS desulfurized waste residue resource utilization method according to claim 1, characterized in that: and in the step C, adjusting the pH of the filtrate by using dilute sulfuric acid with the pH of 1-2.
  7. 7. The SDS desulfurized waste residue resource utilization method according to any one of claims 1 to 6, wherein: in the step C, the purity of the obtained sodium sulfate is 92-96%.
CN202011406403.8A 2020-12-02 2020-12-02 Resource utilization method of SDS (sodium dodecyl sulfate) desulfurization waste residues Pending CN112642837A (en)

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757262A1 (en) * 1976-12-28 1978-06-29 Inst Francais Du Petrol PROCESS FOR THE REGENERATION OF SALT SOLUTIONS CONTAINING SODIUM SULPHITES AND SULPHATES
US6180074B1 (en) * 1995-10-31 2001-01-30 Novacarb Method for processing flue gases containing sulphur oxides
US20110027152A1 (en) * 2008-04-07 2011-02-03 Cui Huaiqi Combined process for preparing calcined soda by applying surface engineering technology to natural soda preparation
CN103769407A (en) * 2012-10-26 2014-05-07 中国石油化工股份有限公司 Regeneration method for sulphureous alkali residues
CN104399363A (en) * 2014-12-02 2015-03-11 成都华西堂投资有限公司 Waste recycling and regenerating device used in flue gas purification method
US20180155208A1 (en) * 2016-11-11 2018-06-07 Rocher Manganese, Inc. Processing of cobaltous sulpha/dithionate liquors derived from cobalt resource
CN109881019A (en) * 2019-04-25 2019-06-14 河钢股份有限公司承德分公司 A kind of method of resource utilization desulfurization slag containing vanadium
CN110451532A (en) * 2019-08-28 2019-11-15 淮阴工学院 A kind of sodium method Desulphurization recycling processing method
CN110697738A (en) * 2019-11-29 2020-01-17 南京金瀚环保科技有限公司 Sodium bicarbonate dry-process desulfurized fly ash recycling method
CN111701419A (en) * 2020-06-16 2020-09-25 山西京耘环保科技有限公司 Sodium-alkali dry-method desulfurized fly ash recycling method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757262A1 (en) * 1976-12-28 1978-06-29 Inst Francais Du Petrol PROCESS FOR THE REGENERATION OF SALT SOLUTIONS CONTAINING SODIUM SULPHITES AND SULPHATES
US6180074B1 (en) * 1995-10-31 2001-01-30 Novacarb Method for processing flue gases containing sulphur oxides
US20110027152A1 (en) * 2008-04-07 2011-02-03 Cui Huaiqi Combined process for preparing calcined soda by applying surface engineering technology to natural soda preparation
CN103769407A (en) * 2012-10-26 2014-05-07 中国石油化工股份有限公司 Regeneration method for sulphureous alkali residues
CN104399363A (en) * 2014-12-02 2015-03-11 成都华西堂投资有限公司 Waste recycling and regenerating device used in flue gas purification method
US20180155208A1 (en) * 2016-11-11 2018-06-07 Rocher Manganese, Inc. Processing of cobaltous sulpha/dithionate liquors derived from cobalt resource
CN109881019A (en) * 2019-04-25 2019-06-14 河钢股份有限公司承德分公司 A kind of method of resource utilization desulfurization slag containing vanadium
CN110451532A (en) * 2019-08-28 2019-11-15 淮阴工学院 A kind of sodium method Desulphurization recycling processing method
CN110697738A (en) * 2019-11-29 2020-01-17 南京金瀚环保科技有限公司 Sodium bicarbonate dry-process desulfurized fly ash recycling method
CN111701419A (en) * 2020-06-16 2020-09-25 山西京耘环保科技有限公司 Sodium-alkali dry-method desulfurized fly ash recycling method

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