CN102731001A - Phosphogypsum composite pretreatment technique - Google Patents
Phosphogypsum composite pretreatment technique Download PDFInfo
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- CN102731001A CN102731001A CN2012102587355A CN201210258735A CN102731001A CN 102731001 A CN102731001 A CN 102731001A CN 2012102587355 A CN2012102587355 A CN 2012102587355A CN 201210258735 A CN201210258735 A CN 201210258735A CN 102731001 A CN102731001 A CN 102731001A
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Abstract
The invention discloses a phosphogypsum composite pretreatment technique which comprises the following steps: directly taking phosphogypsum slag from a slag discharge port of a chemical industry enterprise, passing through a 30-mesh vibrating screen for separation, and meanwhile flushing the phosphogypsum slag with industrial wastewater of the chemical industry enterprise to remove hard mineral impurities; adding an alkaline calcium-increase liquid which accounts for 1-2 wt% of phosphogypsum into the phosphogypsum slurry obtained by flushing so as to regulate the pH value to 7+/-1, sending into a stratification filter tank, stirring, standing, and removing a surface layer organic substance film and soluble impurities; and sending the stratified and purified phosphogypsum slurry into a vacuum filter to carry out vacuum filtration, thereby obtaining filter residues and a filtrate. According to the technique, the phosphogypsum slag at the discharge port of the chemical industry enterprise is directly utilized to extract the high-purity low-impurity high-grade phosphogypsum, thereby saving the stock place and lowering the transportation cost; and the raw material is from three wastes and does not generate secondary pollution, the intermediate product hard mineral impurities can be directly used commercially, and water can be used circularly, thereby greatly enhancing the comprehensive utilization ratio of the phosphogypsum and implementing organic unification of environmental, economical and social benefits.
Description
Technical field
The present invention relates to the renewable resource environmental technology field, the compound pretreatment technology of especially a kind of phosphogypsum.
Background technology
Phosphogypsum is the industrial residue of phosphoric acid or phosphate fertilizer industry and the discharging of some synthetic detergent industry, and staple is terra alba (CaSO
42H
2O), but also contain undecomposed phosphorus ore, multiple being detrimental to health and biological growth such as phosphoric acid, Calcium Fluoride (Fluorspan), Sodium Fluoride, iron aluminide, sour insoluble organic matter and shale foreign material of washes clean not, and influence the impurity of plastering quality.Wherein, titanium pigment reduces prolongation time of coagulation, the intensity of semi-hydrated gypsum; The solvable fluorine that exists with the NaF form can make the hydrated product dihydrate gypsum crystal extensive, and conjugation reduces between crystal, and structural capacity weakens; Organism increases plaster of Paris surface denseness, needs water consumption to increase when glued, and prolong time of coagulation, and weaken the joint of dihydrate gypsum crystal, makes sclerotium loosely organized, and intensity reduces; Potassium, sodium salt can make the plastering surface hydrochloric acid occur, attach to be easy to get into environment when the sour water of containing is stacked, and water body and soil are produced detrimentally affect.Generally speaking, the phosphogypsum solid impurity content of chemical enterprise emission is more than 10%, and total phosphorus reaches 1.5%-2%, pH value 1-2, SO
3Content is lower than 35%; Contain sour water about 30, the terra alba total amount is less than 70%, and contains a small amount of organism, phosphate anion, sulfate ion; Influence plastering, particularly discharging is stored up and is shown water, underground water, plant growth, human settlement over the ground and can produce very big harm.As do not handle any row and pile; Not only take a large amount of soils; And loss and some radioelement of the seepage of sour water, fluorine very easily cause environmental pollution; Also hindered comprehensive utilization of phosphogypsum, only removed or reduced the detrimental impurity in the phosphogypsum, just can make it become available secondary resource.Therefore, must carry out pre-treatment, significantly improving the phosphogypsum utilization ratio, to turn waste into wealth, thereby realize that protection is ecological, benefit the society phosphogypsum.
Phosphogypsum being carried out pre-treatment both at home and abroad at present has physics, chemistry and physico-chemical process, include WATER-WASHING METHOD, neutralisation, staging, wet screening vortex method, dodge and water method, flotation process, ball milled etc., but they respectively has relative merits.Though the water washing cleaning treatment process can be removed a large amount of impurity and organism, water loss Da Yi causes secondary pollution, and sewage treatment equipment is prone to the industry scale formation.In with the modification method to P in the phosphogypsum
2O
5Influence significantly, and is still limited to other impurity effect, and cost is higher.The impurity of Cerphos purifying process (staging) main processing footpath grain between 16um-25um, wet screening eddy flow rule is mainly dissolved phosphogypsum and the organism of enrichment and the phosphoric acid salt in lattice of granularity at 10-15um.Sudden strain of a muscle is watered in the method process can produce obnoxious flavour, and flotation process is the remarkable and easy erosion of floatation equipment to the soluble impurity removal effect, and ball milling washing process owned by France is mostly got material at ardealite storage yard to the pre-treatment of phosphogypsum, and this moment, phosphogypsum polluted environment.
In sum, quality is good more less just is utilized more easily for phosphogypsum impurity, therefore, is the matter of utmost importance that solves the phosphogypsum comprehensive utilization to the purification pre-treatment of phosphogypsum.Yet current still do not have Pretreatment Technology of Phosphogypsum preferably, thereby cause the utilization ratio of phosphogypsum extremely low.
Summary of the invention
The technical problem that the present invention will solve provides a kind of reasonable, advanced, economic compound pretreatment technology of phosphogypsum; To extract the low impurity fine phosphogypsum of high purity; Thereby realize the high-efficiency comprehensive utilization phosphogypsum, the purpose that can protect environment can give up admittedly again and utilize.
For solving the problems of the technologies described above; The present invention adopts following technical scheme: the compound pretreatment technology of phosphogypsum; Directly get the phosphogypsum slag from the slag-drip opening of chemical enterprise, enter 30 order vibratory screening apparatus sortings, the trade effluent with chemical enterprise washes the phosphogypsum slag simultaneously; Rub into the purification process of washing and sorting, can remove the thicker impurity such as hard mineral of 10% left and right sides particle diameter during screening; Add the alkali matter that accounts for phosphogypsum quality 1%～2% in the phosphogypsum slurries that obtain after the flushing and increase calcium liquid adjusting pH value to 7 ± 1; Sending into the layering filter tank then stirs, leaves standstill; The utilization method for floating is removed top layer organism film and soluble impurity; Fully used simultaneously the neutralisation principle to change the pH value of phosphogypsum, can effectively avoid erosion treating plant; The phosphogypsum slurries that layering is purified enter vacuum filter and carry out vacuum filtration, filter residue and drainage.
Chemical enterprise is phosphoric acid, phosphate fertilizer or synthetic detergent manufacturing enterprise, as long as there is the enterprise of phosphogypsum discharge port can use this technology.
Trade effluent is from the waste water of fertilizer plant's phosphorus ore ball milling or the generation of phosphoric acid washing process.
Alkali matter increases calcium liquid and is stirred and formed by increase calcium alkaline residue or the lime dilution of the sugared slag of the carbide slag of chemical enterprise production of caustic soda discharging, sugar refinery discharging, paper mill discharging, and its pH value is 12～14, the purpose of adding be in the pH value of phosphogypsum neutrality extremely.Belong to solid useless utilization of industry, with respect to the method for tradition with the lime neutralizing treatment, the one, no dust pollution does not produce obnoxious flavour, and the 2nd, practiced thrift the purification cost, more paid attention to economic benefit.
Filter residue is the high purity phosphogypsum.
The high purity phosphogypsum is moisture below 10%, pH value 7 ± 1, SO
3Reach more than 43% CaSO
42H
2O content is more than 90%, and solvable phosphorus decomposing is below 0.01%, and total phosphorus is below 0.05%, and impurity is below 1%.
The hard dirt directly is used for concrete production, directly produces economic benefit.
Drainage flows back to chemical enterprise phosphorus ore ball mill by pipeline and utilizes, has guaranteed under the situation that does not form the water pollution, to have realized the recovery again of available phosphorus, and the effective utilization of water and the high efficiente callback of phosphorus have brought remarkable economic efficiency.
The traditional method of chemical enterprise is directly the phosphogypsum slag to be drained into slag dam to store up; This moment dust be scattered, contamination phenomenon such as sour water seepage taken place; When phosphogypsum will be utilized; Be transported to the disposal field by slag dam again and purify, process, so repeatedly transportation has increased cost first, and the 2nd, destroyed environment.For this reason, the present invention directly gets phosphogypsum from the chemical enterprise slag-drip opening, before phosphogypsum pollutes ecotope as yet, does not carry out compound pre-treatment, greatly reduces phosphogypsum and stores up the influence to ecotope.The contriver adopts physico-chemical process that the phosphogypsum slag is purified; Removed most of impurity or foreign matter content has been reduced to than low degree; Obtained the high purity phosphogypsum; Can directly be transported to cement setting retarder and light gypsum walling production site is stored up, the hard dirt that sub-sieve extracts then can be used for commerical ready-mixed concrete.Whole process flow of the present invention is not discharged harmful solid useless and toxic gas; Stopped secondary pollution; Solve phosphogypsum and discharged land occupation, waste sulphur resource, contaminate environment, the ecological problem of harm arbitrarily; Guaranteed with the high-quality phosphogypsum to be the quality of the derived product of raw material simultaneously, the high purity phosphogypsum can be applicable to production higher-grade producing cement from phosphor retardant and α, β gypsum, has realized the organic unity of environmental benefit, economic benefit, social benefit.
Description of drawings
Fig. 1 is the schema of the compound pretreatment technology of phosphogypsum of the present invention.
Embodiment
Fig. 1 has shown the flow process of the compound pretreatment technology of phosphogypsum of the present invention, and wherein phosphogypsum is taken from the terminal slag-drip opening of chemical enterprise technical process, further specifies the present invention below in conjunction with embodiment.
Embodiment 1
Raw material sources
Phosphogypsum slag---Guangxi Luzhai chemical fertilizer ltd production discharge port contains 30 left and right sides sour waters, 15% solid impurity, 35% SO in the phosphogypsum slag
3, 70% CaSO
42H
2O, pH=2, particle is uneven, is grey black.
Trade effluent---waste water between certain fertilizer plant's phosphorus ore ball grinding vehicle.
Alkali matter increases calcium liquid---the slurries of the lime furnishing that peripheral Lime Factory produces, pH value about 12.
Technical process
Directly get the phosphogypsum slag from the slag-drip opening of chemical enterprise; Enter 30 order vibratory screening apparatus sortings; With trade effluent flushing phosphogypsum slag, remove the thicker hard dirt of 10% left and right sides particle diameter simultaneously, add the alkali matter that accounts for phosphogypsum quality 2% in the phosphogypsum slurries that obtain after the flushing and increase calcium liquid adjusting pH value to 7 ± 1; Sending into the layering filter tank then stirs, leaves standstill; Remove top layer organism film and soluble impurity, the phosphogypsum slurries that layering is purified enter vacuum filter and carry out vacuum filtration, filter residue and drainage.Filter residue is the high purity phosphogypsum, and transportation is stored up.Drainage flows back to chemical enterprise phosphorus ore ball mill by pipeline and utilizes.
Embodiment 2
Raw material sources
The phosphogypsum slag---with embodiment 1.
Trade effluent---certain fertilizer plant's phosphoric acid washing technical process waste water.
Alkali matter increases calcium liquid---and the carbide slag dilution stirring by the discharging of chemical plant, Liuzhou production of caustic soda forms, and its pH value is about 14.
Technical process
The alkali matter of adding 1% increases calcium liquid and regulates pH value to 7 ± 1, and other are with reference to embodiment 1.
Embodiment 3
Raw material sources
The phosphogypsum slag---with embodiment 1.
Trade effluent---waste water between certain fertilizer plant's phosphorus ore ball grinding vehicle.
Alkali matter increases calcium liquid---and the calcium alkaline residue dilution stirring that increases of already being discharged by Guangxi phoenix candy paper forms, and its pH value is about 13.Technical process
The alkali matter of adding 1.5% increases calcium liquid and regulates pH value to 7 ± 1, and other are with reference to embodiment 1.
Through detecting, the high purity phosphogypsum of embodiment 1 to 3 is moisture below 10%, pH value 7 ± 1, SO
3Reach more than 43% CaSO
42H
2O content is more than 90%, and solvable phosphorus decomposing is below 0.01%, and total phosphorus is below 0.05%, and impurity is specifically seen table 1 below 1%.
The component and the performance of table 1 embodiment 1 to 3 high purity phosphogypsum
Claims (8)
1. compound pretreatment technology of phosphogypsum; It is characterized in that directly getting the phosphogypsum slag from the slag-drip opening of chemical enterprise, enter 30 order vibratory screening apparatus sortings, the trade effluent with chemical enterprise washes the phosphogypsum slag simultaneously; Remove the hard dirt; Add the alkali matter that accounts for phosphogypsum quality 1%～2% in the phosphogypsum slurries that obtain after the flushing and increase calcium liquid adjusting pH value to 7 ± 1, send into the layering filter tank then and stir, leave standstill, remove top layer organism film and soluble impurity; The phosphogypsum slurries that layering is purified enter vacuum filter and carry out vacuum filtration, filter residue and drainage.
2. the compound pretreatment technology of phosphogypsum according to claim 1 is characterized in that: said chemical enterprise is phosphoric acid, phosphate fertilizer or synthetic detergent manufacturing enterprise.
3. the compound pretreatment technology of phosphogypsum according to claim 1 is characterized in that: said trade effluent is from the waste water of fertilizer plant's phosphorus ore ball milling or the generation of phosphoric acid washing process.
4. the compound pretreatment technology of phosphogypsum according to claim 1; It is characterized in that: said alkali matter increases calcium liquid and is stirred and formed by increase calcium alkaline residue or the lime dilution of the sugared slag of the carbide slag of chemical enterprise production of caustic soda discharging, sugar refinery discharging, paper mill discharging, and its pH value is 12～14.
5. the compound pretreatment technology of phosphogypsum according to claim 1 is characterized in that: said filter residue is the high purity phosphogypsum.
6. the compound pretreatment technology of phosphogypsum according to claim 5 is characterized in that: said high purity phosphogypsum is moisture below 10%, pH value 7 ± 1, SO
3Reach more than 43% CaSO
42H
2O content is more than 90%, and solvable phosphorus decomposing is below 0.01%, and total phosphorus is below 0.05%, and impurity is below 1%.
7. the compound pretreatment technology of phosphogypsum according to claim 1 is characterized in that: said hard dirt directly is used for concrete production.
8. the compound pretreatment technology of phosphogypsum according to claim 1 is characterized in that: said drainage flows back to chemical enterprise phosphorus ore ball mill by pipeline and utilizes.
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|---|---|---|---|
| CN201210258735.5A CN102731001B (en) | 2012-07-25 | 2012-07-25 | Phosphogypsum composite pretreatment technique |
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|---|---|---|---|
| CN201210258735.5A CN102731001B (en) | 2012-07-25 | 2012-07-25 | Phosphogypsum composite pretreatment technique |
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| CN102731001A true CN102731001A (en) | 2012-10-17 |
| CN102731001B CN102731001B (en) | 2014-02-26 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482667A (en) * | 2013-09-23 | 2014-01-01 | 瓮福（集团）有限责任公司 | Quick and efficient purifying method for phosphogypsum |
| CN103708750A (en) * | 2013-12-26 | 2014-04-09 | 中国地质大学（武汉） | Pre-treatment technology of ardealite |
| CN105348863A (en) * | 2015-11-29 | 2016-02-24 | 贵州开磷集团股份有限公司 | Method for preparing ardealite filler for producing PVC (PVC) material |
| CN105439185A (en) * | 2014-12-05 | 2016-03-30 | 贵州路发实业有限公司 | Method for producing active CaO added to production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid |
| CN105439484A (en) * | 2014-12-05 | 2016-03-30 | 贵州路发实业有限公司 | Method for using dry process to add CaO into by-product alkalescence phosphogypsum |
| CN105439186A (en) * | 2014-12-05 | 2016-03-30 | 贵州路发实业有限公司 | By-product alkalescence phosphogypsum process control method |
| CN105460968A (en) * | 2014-12-05 | 2016-04-06 | 贵州路发实业有限公司 | Method for preparing byproduct weakly alkaline phosphogypsum |
| CN107140861A (en) * | 2017-06-21 | 2017-09-08 | 湖北宜化集团有限责任公司 | A kind of method using fresh producing cement retarder through phosphogypsum |
| CN109694098A (en) * | 2017-10-23 | 2019-04-30 | 北新集团建材股份有限公司 | Ardealite preprocess method and ardealite Thistle board and preparation method thereof |
| CN112429991A (en) * | 2021-01-08 | 2021-03-02 | 瓮福（集团）有限责任公司 | Device for flotation and water washing of phosphogypsum |
| CN112794754A (en) * | 2020-12-15 | 2021-05-14 | 安徽六国化工股份有限公司 | Method for purifying phosphogypsum by leaching water and jointly producing water-soluble fertilizer and liquid fertilizer |
| CN112808736A (en) * | 2020-12-21 | 2021-05-18 | 贵州昊华工程技术有限公司 | Purification and harmless treatment method of phosphogypsum |
| CN114247556A (en) * | 2021-12-23 | 2022-03-29 | 四川轻化工大学 | Phase change purification method for industrial byproduct gypsum and phase change purified gypsum |
| CN114653473A (en) * | 2022-03-30 | 2022-06-24 | 云南磷化集团有限公司 | Flotation method for efficiently purifying phosphogypsum |
| CN115672534A (en) * | 2022-10-28 | 2023-02-03 | 东方电气集团东方锅炉股份有限公司 | Method for preparing high-purity gypsum concentrate by using phosphogypsum |
| CN115974437A (en) * | 2022-12-28 | 2023-04-18 | 四川国泰民安科技有限公司 | Efficient ardealite processing system |
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| US4935211A (en) * | 1989-01-23 | 1990-06-19 | Azar David G | Fluorogypsum waste solidification material |
| CN1312234A (en) * | 2001-04-10 | 2001-09-12 | 南京九仕威工贸有限公司 | Modified and pretreated ardealite |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4935211A (en) * | 1989-01-23 | 1990-06-19 | Azar David G | Fluorogypsum waste solidification material |
| CN1312234A (en) * | 2001-04-10 | 2001-09-12 | 南京九仕威工贸有限公司 | Modified and pretreated ardealite |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482667A (en) * | 2013-09-23 | 2014-01-01 | 瓮福（集团）有限责任公司 | Quick and efficient purifying method for phosphogypsum |
| CN103482667B (en) * | 2013-09-23 | 2014-10-15 | 瓮福（集团）有限责任公司 | Quick and efficient purifying method for phosphogypsum |
| CN103708750A (en) * | 2013-12-26 | 2014-04-09 | 中国地质大学（武汉） | Pre-treatment technology of ardealite |
| CN103708750B (en) * | 2013-12-26 | 2015-09-16 | 中国地质大学（武汉） | A kind of pretreatment technology of phosphogypsum |
| CN105439185A (en) * | 2014-12-05 | 2016-03-30 | 贵州路发实业有限公司 | Method for producing active CaO added to production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid |
| CN105439484A (en) * | 2014-12-05 | 2016-03-30 | 贵州路发实业有限公司 | Method for using dry process to add CaO into by-product alkalescence phosphogypsum |
| CN105439186A (en) * | 2014-12-05 | 2016-03-30 | 贵州路发实业有限公司 | By-product alkalescence phosphogypsum process control method |
| CN105460968A (en) * | 2014-12-05 | 2016-04-06 | 贵州路发实业有限公司 | Method for preparing byproduct weakly alkaline phosphogypsum |
| CN105348863A (en) * | 2015-11-29 | 2016-02-24 | 贵州开磷集团股份有限公司 | Method for preparing ardealite filler for producing PVC (PVC) material |
| CN107140861A (en) * | 2017-06-21 | 2017-09-08 | 湖北宜化集团有限责任公司 | A kind of method using fresh producing cement retarder through phosphogypsum |
| CN109694098A (en) * | 2017-10-23 | 2019-04-30 | 北新集团建材股份有限公司 | Ardealite preprocess method and ardealite Thistle board and preparation method thereof |
| CN112794754A (en) * | 2020-12-15 | 2021-05-14 | 安徽六国化工股份有限公司 | Method for purifying phosphogypsum by leaching water and jointly producing water-soluble fertilizer and liquid fertilizer |
| CN112808736A (en) * | 2020-12-21 | 2021-05-18 | 贵州昊华工程技术有限公司 | Purification and harmless treatment method of phosphogypsum |
| CN112429991A (en) * | 2021-01-08 | 2021-03-02 | 瓮福（集团）有限责任公司 | Device for flotation and water washing of phosphogypsum |
| CN114247556A (en) * | 2021-12-23 | 2022-03-29 | 四川轻化工大学 | Phase change purification method for industrial byproduct gypsum and phase change purified gypsum |
| CN114247556B (en) * | 2021-12-23 | 2023-06-09 | 四川轻化工大学 | Phase-change purification method for industrial byproduct gypsum and phase-change purified gypsum |
| CN114653473A (en) * | 2022-03-30 | 2022-06-24 | 云南磷化集团有限公司 | Flotation method for efficiently purifying phosphogypsum |
| CN114653473B (en) * | 2022-03-30 | 2023-11-17 | 云南磷化集团有限公司 | Flotation method for efficiently purifying phosphogypsum |
| CN115672534A (en) * | 2022-10-28 | 2023-02-03 | 东方电气集团东方锅炉股份有限公司 | Method for preparing high-purity gypsum concentrate by using phosphogypsum |
| CN115974437A (en) * | 2022-12-28 | 2023-04-18 | 四川国泰民安科技有限公司 | Efficient ardealite processing system |
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