CN115415291B - Treatment method of titanium dioxide chloride slag by chlorination process - Google Patents

Treatment method of titanium dioxide chloride slag by chlorination process Download PDF

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CN115415291B
CN115415291B CN202210796445.XA CN202210796445A CN115415291B CN 115415291 B CN115415291 B CN 115415291B CN 202210796445 A CN202210796445 A CN 202210796445A CN 115415291 B CN115415291 B CN 115415291B
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chloride
slag
solution
ammonium chloride
titanium dioxide
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CN115415291A (en
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廖周荣
谢濠江
颜华
杨连智
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Yibin Tianyuan Haifeng Hetai Co ltd
Yibin Tianyuan Group Co Ltd
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Yibin Tianyuan Haifeng Hetai Co ltd
Yibin Tianyuan Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
    • B09B3/32—Compressing or compacting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/16—Halides of ammonium
    • C01C1/164—Ammonium chloride
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a treatment method of titanium dioxide chloride slag by a chlorination method, which comprises the following steps: s1, preparing chloridized slag into chloridized slag slurry with the solid content of 20-30% by using dilute hydrochloric acid with the mass concentration of 5-10%, and carrying out pressure filtration on the chloridized slag slurry; s2, adding phosphoric acid into the filtrate; s3, adding excessive ammonia water into the clear metal chloride solution; s4, adding a calcium hydroxide solution with the mass concentration of 5% -15% into the ammonium chloride clear solution; s5, using the ammonia-containing calcium chloride solution to absorb carbon dioxide gas in the flue gas of the thermal power plant; s6, carrying out solid-liquid separation and drying on the calcium carbonate slurry to obtain an industrial grade light calcium carbonate and ammonium chloride solution. The advantages are that: the method has the advantages of simple process flow, mild reaction conditions, low comprehensive energy consumption, zero emission and by-product meeting national or industry requirements, realizes the resource utilization of the chloride slag and the carbon emission reduction work of the thermal power plant, and has better popularization prospect.

Description

Treatment method of titanium dioxide chloride slag by chlorination process
Technical Field
The invention relates to a titanium dioxide production technology, in particular to a technology for treating byproducts in titanium dioxide production by a chlorination process.
Background
The outsourced qualified petroleum coke and titanium-rich material are pumped through a bin pump according to a certain proportion to be boiled in a chlorination furnace, and react with chlorine from liquid chlorine vaporization or chlorine returned by an oxidation bag filter in a fluidization state to generate titanium tetrachloride gas. The generated titanium tetrachloride gas sprays crude titanium tetrachloride through an outlet conveying pipe to be cooled to 500 ℃, and then enters a condensation station spray cooler to be cooled after solid particles are removed through a cyclone separator. The separated solid particles are chloridized slag, mainly metal chloride, partial unreacted high titanium slag and petroleum coke.
The components of the chloridized slag are complex, the chloridized slag is acid waste slag, the chloridized slag is acid waste liquid after being dissolved in water, and the waste liquid is directly discharged without treatment, thus the environment is seriously polluted. The prior art is to add Ca (OH) 2、Na2CO3 or NaOH into the acidic waste liquid to neutralize and then to carry out classification treatment. The boiling chlorination waste residue is treated by a dissolution neutralization method generally in China, specifically, the dust collection residue is dissolved by acidic water, and is filtered once, and the main components of the solid residue are unreacted high titanium residue and petroleum coke, so that the solid residue can be recycled; neutralizing the filtrate with lime milk, generating hydroxide precipitate by metal chloride, filtering again, taking ferric hydroxide as main component of solid slag, and delivering into slag field for landfill; concentrating and evaporating the filtrate to produce solid calcium chloride. The technology is mature, basically harmless treatment is achieved, and the problems are that a solid landfill is needed and market sales of solid calcium chloride are limited.
The disposal technology adopted at home and abroad is a landfill stacking and deep well method, taking DuPont corporation in U.S. as an example, one is to fill or stack the waste mine with the chloridized slag after adding lime into the acid waste liquid for neutralization and the other is a deep well method, and the specific method is to directly pour the acid chloridized slag slurry into the rock layer with a closed structure below 2000 m. The process is most economical, but has special requirements on geology and geographical conditions, and the problems of water pollution, influence on the geological structure of the rock stratum and the like are not worried about.
The Chinese patent publication No. CN104874590B discloses a resource treatment method of chloride waste residue, firstly, the chloride waste residue is made into slurry by pure water, then is primarily separated into a light phase and a heavy phase, after the light phase and the heavy phase are separated in solid-liquid mode, the solid phase is reused or used as fuel, and after the light phase is combined, the solid phase is neutralized with ammonia to obtain ferric oxide and ammonium chloride. The biggest problem of the method is that the byproducts of ferric oxide and ammonium chloride still contain more metal ion impurities, and the application field of the method is limited.
The Chinese patent publication No. CN108675499A discloses a comprehensive treatment method of pulping waste water of chloride slag, firstly adding excessive sodium sulfate to react with the pulping calcium chloride waste water to obtain white gypsum and crude brine. And adding a proper amount of BaCl2 and Na2CO3 into the crude brine to control SO 4 2-、Ca2+、Mg2+ plasma in the crude brine system to obtain primary brine. The crude brine obtained by the method still has more impurity ions (such as Fe 2+、Al3+、Mg2+ plasma), and the crude brine is used for an electrolytic tank of a chlor-alkali system, so that the problems of high tank voltage, low current efficiency and the like of the electrolytic tank can be caused.
The Chinese patent publication No. CN113912235A discloses a method for treating titanium dioxide wastewater by a chlorination method, which comprises the steps of preparing a mirabilite solution by using strong brine, carrying out neutralization reaction on the mirabilite solution and the chloride slag wastewater, obtaining a sodium chloride solution through precipitation and filter pressing, and removing calcium from filtrate by adding alkali and evaporating and crystallizing to obtain higher-quality sodium chloride. The method further obtains high-quality sodium chloride with reduced impurities through an evaporation crystallization mode, but the high-quality sodium chloride is still used for the electrolytic tank of the chlor-alkali system, so that the problems of high tank voltage, low current efficiency and the like of the electrolytic tank still occur.
In summary, from the latest domestic research situation, there are two main ways of treating the chloride slag at present, firstly, the calcium chloride slag is neutralized by quicklime after solid-liquid separation to obtain a solid calcium chloride product, and the problem of poor market sales is faced; secondly, sodium carbonate or sodium hydroxide is adopted for neutralization after solid-liquid separation to obtain sodium chloride brine, and the sodium chloride brine is recycled to an electrolytic tank of a chlor-alkali system to cause the problems of high tank voltage, low current efficiency and the like.
Disclosure of Invention
The invention provides a method for treating titanium dioxide chloride slag by a chlorination method, which aims to reduce the treatment cost and improve the economic value of the chloride slag at the same time and widen the application range.
The technical scheme adopted by the invention is as follows: the treatment method of the titanium dioxide chloride slag by the chlorination method comprises the following steps:
S1, preparing chloridized slag into chloridized slag slurry with the solid content of 20-30% by using dilute hydrochloric acid with the mass concentration of 5-10%, and performing filter pressing on the chloridized slag slurry to obtain a high titanium slag-stone tar mixture and filtrate;
S2, adding metering phosphoric acid into the filtrate to enable metal ions in the filtrate to generate phosphate precipitation, and obtaining metal chloride clear liquid after clarification;
S3, adding excessive ammonia water into the clear metal chloride solution, and clarifying to obtain neutralized precipitate and clear ammonium chloride solution after precipitation is not generated any more;
S4, adding a calcium hydroxide solution with the mass concentration of 5% -15% into the ammonium chloride clear solution according to the chloride ion content in the ammonium chloride clear solution, and clarifying to obtain an ammonia-containing calcium chloride solution;
s5, using the ammonia-containing calcium chloride solution to absorb carbon dioxide gas in the flue gas of the thermal power plant to obtain calcium carbonate slurry;
S6, carrying out solid-liquid separation and drying on the calcium carbonate slurry to obtain an industrial grade light calcium carbonate and ammonium chloride solution.
As a further improvement of the invention, the ammonium chloride solution is subjected to freeze crystallization to obtain an ammonium chloride product and an ammonium chloride mother liquor.
As a further improvement of the present invention, the preparation method of the calcium hydroxide solution in step S4 is as follows: and adding the ammonium chloride mother solution into calcium carbide wet slag with the water content of 40% to obtain a calcium hydroxide solution with the mass concentration of 5% -15%.
As a further improvement of the present invention, the ammonia concentration in the ammoniated calcium chloride solution during the absorption of step S5 is adjusted by supplementing ammonia water. The ammonia water is prepared by adopting the ammonium chloride mother solution.
As a further improvement of the present invention, the neutralized precipitate described in step S3 is dried and then used as a cement production raw material.
As a further improvement of the invention, the Gao Tai slag-petroleum coke mixture in the step S1 is dried, granulated and returned to a production system or sold.
As a further improvement of the present invention, the mass of the ammonia water added to the metal chloride supernatant of step S3 is not more than 5% of the mass of the metal chloride supernatant.
The invention also discloses industrial light calcium carbonate which is prepared by the treatment method of the titanium dioxide chloride slag by the chlorination process.
The invention also discloses a production method of the titanium dioxide by the chlorination process, which is characterized by comprising the treatment method of the titanium dioxide chlorination slag by the chlorination process.
(1) The chloride ions in the chloride slag are converted into ammonium chloride, so that the problem that calcium chloride is difficult to sell is avoided, the problem that the electrolysis is influenced by impurities contained in sodium chloride is avoided, and the problem of chloride ion utilization is solved.
(2) The multi-stage sedimentation and clarification ensure that the petroleum coke content of the neutralization slag generated in the neutralization process of the chlorination slag is controlled, and meanwhile, the addition of ammonia water ensures that most of chloride ions in the solution are surrounded by complexation, so that the content of the chloride ions of the neutralization slag is reduced, and the problem that the neutralization slag is used for cement production is solved.
(3) The phosphoric acid is adopted to pretreat the chloridized slag mother liquor, and ammonia water with lower price is adopted to replace sodium hydroxide to neutralize the chloridized slag, so that the cost of chloridized slag treatment is further reduced.
(4) The ammonium chloride mother liquor is used for leaching and purifying the carbide slag solution, the carbide slag solution is used for converting the ammonium chloride solution into the ammonia-containing calcium chloride solution, and the carbon dioxide is absorbed by adopting the solution, so that the cost of the carbon emission reduction process is further reduced.
(5) The invention has simple process flow, mild reaction condition, lower comprehensive energy consumption and zero emission, and the byproducts can meet the national or industry requirements, thereby realizing the resource utilization of the chloride slag and the carbon emission reduction work of the thermal power plant and having better popularization prospect.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Embodiment one:
The treatment of titanium dioxide chloride slag by the chlorination method is carried out according to the following method:
S1, diluting hydrochloric acid with the mass concentration of 30% to 5% by adopting industrial water, preparing chloridized slag into chloridized slag slurry with the solid content of 20% by using diluted hydrochloric acid, and carrying out filter pressing on the chloridized slag slurry to obtain a high titanium slag-stone tar mixture and filtrate, wherein the high titanium slag and petroleum coke are dried and granulated and then sold;
s2, adding phosphoric acid with the mass of 1% of that of the chloridized slag into the primary filtrate to enable metal ions in the filtrate to generate phosphate precipitation, and obtaining metal chloride clear liquid after clarification;
S3, adding ammonia water accounting for 1% of the mass of the metal chloride clear liquid into the metal chloride clear liquid, clarifying to obtain a neutralization precipitate and an ammonium chloride clear liquid, and using the neutralization precipitate as a cement production raw material after drying;
S4, adding a part of the ammonium chloride mother liquor into calcium carbide wet slag with the water content of 40% to obtain a calcium hydroxide solution with the mass concentration of 5%; adding the calcium hydroxide solution into the ammonium chloride clear solution according to the chloride ion content in the ammonium chloride clear solution, and clarifying to obtain an ammonia-containing calcium chloride solution;
S5, opening a CO 2 gas cylinder and a nitrogen gas cylinder on-off valve to control the concentration of CO 2 to be 10%, then introducing CO 2 gas into the ammonia-containing calcium chloride solution, adjusting the ammonia concentration in the ammonia-containing calcium chloride solution in the absorption process by supplementing ammonia water to ensure that the ammonia concentration is far greater than the chloride ion concentration, obtaining calcium carbonate slurry, and discharging unreacted CO 2 gas after alkali absorption through a fume hood;
S6, carrying out solid-liquid separation and drying on the calcium carbonate slurry to obtain a light calcium carbonate and ammonium chloride solution; the ammonium chloride solution is subjected to freezing crystallization to obtain an ammonium chloride product and an ammonium chloride mother solution. And (5) freezing and crystallizing a part of ammonium chloride mother liquor through an ice water bath to obtain an ammonium chloride product, wherein a part of ammonium chloride mother liquor is used for preparing ammonia water for recycling in the step (S5), and the rest of ammonium chloride mother liquor is collected into a waste liquid barrel.
The purity and whiteness of the obtained light calcium carbonate were measured, and the purity of the obtained ammonium chloride product was shown in Table 1.
Embodiment two:
The repeated experiments were performed according to the procedure of example one, except that the concentration of hydrochloric acid of step S1, the solid content of the chlorinated slag slurry, the addition of phosphoric acid of step S2, the addition of aqueous ammonia of step S3, the concentration of calcium hydroxide solution of step S4, and the concentration of CO 2 of step S5 were adjusted (see Table 1),
The purity and whiteness of the obtained light calcium carbonate were measured, and the purity of the obtained ammonium chloride product was shown in Table 1.
Embodiment III:
The repeated experiments were performed according to the procedure of example one, except that the concentration of hydrochloric acid of step S1, the solid content of the chlorinated slag slurry, the addition of phosphoric acid of step S2, the addition of aqueous ammonia of step S3, the concentration of calcium hydroxide solution of step S4, and the concentration of CO 2 of step S5 were adjusted (see Table 1),
The purity and whiteness of the obtained light calcium carbonate were measured, and the purity of the obtained ammonium chloride product was shown in Table 1.
TABLE 1 index control of the treatment process of chloride slag and product quality detection results
As can be seen from Table 1, the purity of the light calcium carbonate prepared by the method of the invention reaches more than 98%, the whiteness is more than 90%, and the quality requirement of the industrial grade light calcium carbonate can be completely met; the purity of the obtained ammonium chloride product is above 99%, the application field is wide, and the recycling of the chloride slag with low cost and high added value is realized.

Claims (9)

1. The treatment method of the titanium dioxide chloride slag by the chlorination method comprises the following steps:
S1, preparing chloridized slag into chloridized slag slurry with the solid content of 20-30% by using dilute hydrochloric acid with the mass concentration of 5-10%, and performing filter pressing on the chloridized slag slurry to obtain a high titanium slag-stone tar mixture and filtrate;
S2, adding metering phosphoric acid into the filtrate to enable metal ions in the filtrate to generate phosphate precipitation, and obtaining metal chloride clear liquid after clarification;
S3, adding excessive ammonia water into the clear metal chloride solution, and clarifying to obtain neutralized precipitate and clear ammonium chloride solution after precipitation is not generated any more;
S4, adding a calcium hydroxide solution with the mass concentration of 5% -15% into the ammonium chloride clear solution according to the chloride ion content in the ammonium chloride clear solution, and clarifying to obtain an ammonia-containing calcium chloride solution;
s5, using the ammonia-containing calcium chloride solution to absorb carbon dioxide gas in the flue gas of the thermal power plant to obtain calcium carbonate slurry;
S6, carrying out solid-liquid separation and drying on the calcium carbonate slurry to obtain an industrial grade light calcium carbonate and ammonium chloride solution.
2. The method for treating titanium dioxide chloride slag according to claim 1, which is characterized in that: the ammonium chloride solution is subjected to freezing crystallization to obtain an ammonium chloride product and an ammonium chloride mother solution.
3. The method for treating titanium dioxide chloride slag according to claim 2, which is characterized in that: the preparation method of the calcium hydroxide solution in the step S4 comprises the following steps: and adding the ammonium chloride mother solution into calcium carbide wet slag with the water content of 40% to obtain a calcium hydroxide solution with the mass concentration of 5% -15%.
4. The method for treating titanium dioxide chloride slag according to claim 2, which is characterized in that: in the absorption process of step S5, the ammonia concentration in the ammoniated calcium chloride solution is adjusted by supplementing ammonia water.
5. The method for treating titanium dioxide chloride slag according to claim 4, which is characterized in that: the ammonia water is prepared by adopting the ammonium chloride mother solution.
6. The method for treating titanium dioxide chloride slag according to claim 1, which is characterized in that: the neutralized precipitate in step S3 is dried and then used as a raw material for cement production.
7. The method for treating titanium dioxide chloride slag according to claim 1, which is characterized in that: and (3) drying and granulating the Gao Tai slag-petroleum coke mixture in the step (S1), and returning to a production system or selling.
8. The method for treating titanium dioxide chloride slag according to claim 1, which is characterized in that: the mass of the ammonia water added into the clear metal chloride solution in the step S3 is not more than 5% of the mass of the clear metal chloride solution.
9. An industrial grade light calcium carbonate produced by the treatment method of titanium pigment chloride slag according to any one of claims 1 to 8.
CN202210796445.XA 2022-07-06 2022-07-06 Treatment method of titanium dioxide chloride slag by chlorination process Active CN115415291B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0390293A1 (en) * 1989-03-30 1990-10-03 Kemira Pigments B.V. A process of treating metal chloride wastes
CN102976355A (en) * 2012-10-31 2013-03-20 四川大学 Production process for ammonia gas and calcium chloride through utilization of ammonium chloride and carbide slag
CN104874590A (en) * 2014-02-27 2015-09-02 龚家竹 Resource processing method of chlorination waste residue
CN107032382A (en) * 2017-04-11 2017-08-11 宁波环洋新材料股份有限公司 A kind of nano-calcium carbonate and preparation method thereof
CN108372185A (en) * 2018-04-20 2018-08-07 江苏久吾高科技股份有限公司 A kind of titanium chloride slag resource utilization method and its device
CN108636980A (en) * 2018-04-20 2018-10-12 宜宾天原海丰和泰有限公司 A kind of technique of zero discharge of processing titanium chloride slag
WO2020250989A1 (en) * 2019-06-12 2020-12-17 川崎重工業株式会社 Method and apparatus for producing vanadium compound, and method and apparatus for producing redox-flow battery electrolyte

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0390293A1 (en) * 1989-03-30 1990-10-03 Kemira Pigments B.V. A process of treating metal chloride wastes
CN102976355A (en) * 2012-10-31 2013-03-20 四川大学 Production process for ammonia gas and calcium chloride through utilization of ammonium chloride and carbide slag
CN104874590A (en) * 2014-02-27 2015-09-02 龚家竹 Resource processing method of chlorination waste residue
CN107032382A (en) * 2017-04-11 2017-08-11 宁波环洋新材料股份有限公司 A kind of nano-calcium carbonate and preparation method thereof
CN108372185A (en) * 2018-04-20 2018-08-07 江苏久吾高科技股份有限公司 A kind of titanium chloride slag resource utilization method and its device
CN108636980A (en) * 2018-04-20 2018-10-12 宜宾天原海丰和泰有限公司 A kind of technique of zero discharge of processing titanium chloride slag
WO2020250989A1 (en) * 2019-06-12 2020-12-17 川崎重工業株式会社 Method and apparatus for producing vanadium compound, and method and apparatus for producing redox-flow battery electrolyte

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