CN104789753A - New sulfur acid residue desulphurization method - Google Patents

New sulfur acid residue desulphurization method Download PDF

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Publication number
CN104789753A
CN104789753A CN201510073457.XA CN201510073457A CN104789753A CN 104789753 A CN104789753 A CN 104789753A CN 201510073457 A CN201510073457 A CN 201510073457A CN 104789753 A CN104789753 A CN 104789753A
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CN
China
Prior art keywords
sulfate slag
acid residue
edta
novel method
sulfur
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Pending
Application number
CN201510073457.XA
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Chinese (zh)
Inventor
嵇忠平
缪炳园
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Anhui Gai Ya Environmental Protection Technology Co Ltd
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Anhui Gai Ya Environmental Protection Technology Co Ltd
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Application filed by Anhui Gai Ya Environmental Protection Technology Co Ltd filed Critical Anhui Gai Ya Environmental Protection Technology Co Ltd
Priority to CN201510073457.XA priority Critical patent/CN104789753A/en
Publication of CN104789753A publication Critical patent/CN104789753A/en
Pending legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention discloses a new sulfur acid residue desulphurization method which includes the following steps: (1) mixing quantitative sulfur acid residue and EDTA washing wastewater, stirring for reaction of 2-3 hours, and filtering; and (2) quantitatively adding alkali liquor with the concentration of 1% into a filter cake obtained by the step (1), stirring for 1 to 2 hours, press-filtering to obtain iron fine powder meeting the requirements. According to the method, effective components in the EDTA washing wastewater are sued for removal of sulfur in the sulfuric acid residue, the sulfur removal rate is high, and up to more than 90%; and the technological process is simple, cost is low, and industrial application is easy to implement.

Description

A kind of novel method of sulfate slag desulfurization
Technical field
The present invention relates to a kind of novel method of sulfate slag desulfurization, belong to industrial waste residue disposal technical field.
Background technology
Sulfate slag is also called pyrite cinder, is that chemical plant is at the waste residue utilizing pyrite for discharging during raw material production sulfuric acid.Its main component is iron, and in addition also containing other elements such as silicon, calcium, magnesium, sulphur, essential mineral is rhombohedral iron ore, magnetite, quartz, anhydrite etc.China's sulfate slag annual emissions is about 1,000 ten thousand tons, accounts for 1/3rd of residue of chemical industry.The discharge of a large amount of sulfate slag and store up not only can appropriation of land, also can pollute air, water body, soil etc.Simultaneously being rich in the elements such as iron in sulfate slag, is a kind of secondary resource of preciousness, so make full use of sulfate slag not only can eliminate its pollution to environment, also can turn waste into wealth, create certain economic benefit.China produces Iron concentrate to sulfate slag and has carried out experimental study for many years, general employing magnetic separation, gravity treatment or magnetic reconnection interflow journey etc. carry out sorting to sulfate slag, to reach the object that sulphur falls in Fu Tie, also the experimental study adopting biological desulphurization is had, but effect is not very desirable, and mainly the decreasing ratio of sulphur is not high, therefore carry out the efficient of sulfate slag and the research of the sulfur method of economy has important practical significance.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of novel method of sulfate slag desulfurization is provided.The present invention adopts the washes in ethylenediamine tetraacetic acid (EDTA) (ethylenediaminetetraacetic acid) production process to remove sulphur in sulfate slag, and not only the decreasing ratio of sulphur is high, and can reach the treatment of wastes with processes of wastes against one another, the object of recycle.
EDTA washes is mainly containing EDTA, hydrochloric acid, quadrol etc.; Sulphur in sulfate slag is mainly with CaSO 4form exist, also have small part with FeS 2exist etc. form.CaSO 4in Ca 2+caSO is impelled with EDTA complexing 4constantly soluble in water, FeS 2dissolve with hydrochloric acid generation chemical reaction, its chemical equation is as follows:
CaSO 4+EDTA ==[Ca（EDTA）]SO 4
FeS 2+ 2HCl == FeCl 2+ S↓+ H2S↑
For achieving the above object, the technical solution used in the present invention is as follows:
A novel method for sulfate slag desulfurization, is characterized in that, comprises the following steps:
(1) by quantitative sulfate slag and the mixing of EDTA washes, stirring reaction 2-3 hour, filters;
(2) add the alkali lye that quantitative concentration is 1% in filter cake obtained above, stir 1-2 hour, press filtration, obtains satisfactory Iron concentrate.
The mass ratio of described sulfate slag and EDTA washes is 1:2-3.
Described alkali lye is potassium hydroxide solution or sodium hydroxide solution.
Described alkali lye and the mass ratio of sulfate slag are 1.4-1.6:1.
Beneficial effect of the present invention:
(1) the present invention adopts the effective constituent in EDTA washes to remove sulphur in sulfate slag, and the decreasing ratio of sulphur is high, reaches more than 90%;
(2) the present invention is EDTA washes due to what utilize, the treatment of wastes with processes of wastes against one another, and cost is lower;
(3) present invention process flow process is simple, is easy to realize industrial application.
Accompanying drawing explanation
Fig. 1 is sulfate slag desulfurization process schematic diagram of the present invention.
Embodiment
Embodiment 1:
The sulfate slag of 494 grams and 1000 grams of EDTA washess are added in flask, stirring reaction 2.5 filtered after the little time, filter cake puts into flask again, and after the sodium hydroxide solution adding 700 grams 1% stirs 1 hour, press filtration obtains Iron concentrate, and elementary composition before and after the desulfurization of sulfate slag sees the following form 1.
Elementary composition before and after the desulfurization of table 1 sulfate slag (%)
Sulfate slag Total Fe S P Cu Zn As Pb
Before desulfurization 53.65 1.78 0.14 0.21 0.92 0.14 0.45
After desulfurization 58.72 0.11 0.08 0.14 0.56 0.09 0.46
Embodiment 2:
The sulfate slag of 988 grams and 2000 grams of EDTA washess are added in flask, stirring reaction 2.5 filtered after the little time, filter cake puts into flask again, and after the sodium hydroxide solution adding 1400 grams 1% stirs 1 hour, press filtration obtains Iron concentrate, and elementary composition before and after the desulfurization of sulfate slag sees the following form 2.
Elementary composition before and after the desulfurization of table 2 sulfate slag (%)
Sulfate slag Total Fe S P Cu Zn As Pb
Before desulfurization 54.78 1.93 0.12 0.19 0.79 0.09 0.36
After desulfurization 58.66 0.13 0.07 0.12 0.38 0.05 0.37

Claims (4)

1. a novel method for sulfate slag desulfurization, is characterized in that, comprises the following steps:
(1) by quantitative sulfate slag and the mixing of EDTA washes, stirring reaction 2-3 hour, filters;
(2) add the alkali lye that quantitative concentration is 1% in filter cake obtained above, stir 1-2 hour, press filtration, obtains satisfactory Iron concentrate.
2. the novel method of a kind of sulfate slag desulfurization according to claim 1, is characterized in that, the mass ratio of described sulfate slag and EDTA washes is 1:2-3.
3. the novel method of a kind of sulfate slag desulfurization according to claim 1, is characterized in that, described alkali lye is potassium hydroxide solution or sodium hydroxide solution.
4. the novel method of a kind of sulfate slag desulfurization according to claim 1, is characterized in that, described alkali lye and the mass ratio of sulfate slag are 1.4-1.6:1.
CN201510073457.XA 2015-02-11 2015-02-11 New sulfur acid residue desulphurization method Pending CN104789753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510073457.XA CN104789753A (en) 2015-02-11 2015-02-11 New sulfur acid residue desulphurization method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510073457.XA CN104789753A (en) 2015-02-11 2015-02-11 New sulfur acid residue desulphurization method

Publications (1)

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CN104789753A true CN104789753A (en) 2015-07-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101554613A (en) * 2009-05-19 2009-10-14 房志强 Method for recycling industrial waste sulfate slag
CN102251067A (en) * 2011-07-04 2011-11-23 彭海洋 Mehtod for extracting reduced iron by impurity removal of pyrite cinder
CN102327816A (en) * 2011-09-30 2012-01-25 昆明川金诺化工股份有限公司 Method by utilizing sulfuric-acid residue to produce iron concentrates
CN103088203A (en) * 2013-03-01 2013-05-08 罗涛 Method for producing fine iron powder by sulfate slag
CN103160685A (en) * 2013-02-22 2013-06-19 厦门大学 Method of recycling iron fine powder from sulfate residue

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101554613A (en) * 2009-05-19 2009-10-14 房志强 Method for recycling industrial waste sulfate slag
CN102251067A (en) * 2011-07-04 2011-11-23 彭海洋 Mehtod for extracting reduced iron by impurity removal of pyrite cinder
CN102327816A (en) * 2011-09-30 2012-01-25 昆明川金诺化工股份有限公司 Method by utilizing sulfuric-acid residue to produce iron concentrates
CN103160685A (en) * 2013-02-22 2013-06-19 厦门大学 Method of recycling iron fine powder from sulfate residue
CN103088203A (en) * 2013-03-01 2013-05-08 罗涛 Method for producing fine iron powder by sulfate slag

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J. MOGHADASI 等: "Scale deposits in porous media and their removal by EDTA injection", 《HEAT EXCHANGER FOULING AND CLEANING VII》 *
吴德礼 等: "利用硫酸渣生产铁精粉的新工艺研究", 《环境工程》 *

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Application publication date: 20150722

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