CN109320010A - A kind of photovoltaic pickle liquor zero-emission and resource utilization method - Google Patents

Abstract

The invention proposes a kind of photovoltaic pickle liquor zero-emission and resource utilization method, mixed acid waste liquor (the hydrofluoric acid and nitric acid) processing that production of polysilicon etching workshop section generates suitable for photovoltaic and semicon industry；Its process flow is as follows: three-level chemical precipitation adds sodium carbonate deliming by adding calcium hydroxide and calcium chloride fluorine removal；Chemical precipitation water outlet contains sodium chloride and sodium nitrate, is concentrated into saturation state using evaporation technology；The sodium chloride and sodium nitrate crystalline solid that sub-prime crystallization obtains high-purity are carried out using the dissolubility difference of sodium chloride and sodium nitrate；It evaporates water and combines bi-membrane method to handle to discharge or reuse standard using biochemical；Calcirm-fluoride and calcium carbonate are used for building trade realization recycling after expecting drying admittedly, and sodium chloride and sodium nitrate crystalline solid are for sale；This method process flow is reasonable, and investment and operating cost are lower, solves pickle liquor processing problem, realizes the zero-emission and recycling treatment of pickle liquor.

Description

A kind of photovoltaic pickle liquor zero-emission and resource utilization method

Technical field

The present invention relates to the skills that the pickle liquor recycling in photovoltaic industry and semiconductor circuit board manufacturing process recycles Art field, specially a kind of photovoltaic pickle liquor zero-emission and resource utilization method.

Background technique

Production of polysilicon generallys use chemical method for etching in photovoltaic and semicon industry, and it is useless that etching workshop section generates a large amount of nitration mixture Liquid includes mainly hydrofluoric acid and nitric acid, separately there is a small amount of sulfuric acid and silicic acid；Mixed acid waste liquor processing is difficult, imports after usually collecting low Fluorine produces waste water after chemical precipitation fluorine removal, into biochemical system denitrogenation；But mixed acid waste liquor concentration height, acid strong, water and water Matter fluctuation is larger, is easy to generate impact to low fluorine waste water treatment system, causes to be discharged fluorinion concentration to be more than discharge standard；And it is useless Water nitrate is very high, biochemical section needs added in denitrification pond a large amount of carbon sources carry out denitrogenations, investment and operating cost compared with It is high；And need to maintain 90% or more denitrification percent, water outlet total nitrogen be unable to stably reaching standard；Therefore, the mixed acid waste liquor of hydrofluoric acid and nitric acid It need to properly dispose, under the premise of meeting environmental protection treatment requirement, carry out resource utilization.

Patent application CN201610261086- for photovoltaic, semicon industry hydrofluoric acid wastewater recycling and processing equipment and its Technique uses reverse osmosis process that hydrofluoric acid wastewater is concentrated, counter-infiltration clear liquid reuse, and reverse osmosis concentrated liquid returns to chemistry Precipitate fluorine removal system；The patent only considers the processing mode of hydrofluoric acid, does not consider in actual production, and the waste liquid of discharge is usually Hydrofluoric acid and nitric acid mixed acid waste liquor；Also, waste water fluorinion concentration is very high, and reverse osmosis concentration producing water ratio is low, and fouling membrane is serious；

Patent application CN201610317274- hydrofluoric acid etch processing procedure waste acid resource method uses segmentally heating decompression to steam The mode evaporated is extracted spent acid and is recycled；But actually since the corrosivity of hydrofluoric acid is very strong, distillation equipment material needs to meet High temperature resistant, anti-deep-etching, selection is difficult, and operating process will appear " evaporating, emitting, dripping or leaking of liquid or gas ", and system is difficult to operate normally.

Paper " research of hydrofluoric acid mixing acid treatment process " (" think tank's epoch " 2017 17 phases) discusses heavy using chemistry Shallow lake+triple effect evaporation handles mixed acid waste liquor, but the solid waste not properly disposition that its each process procedure generates, and does not meet resource Change demand.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the existing defects, provides a kind of photovoltaic pickle liquor zero-emission and money Sourceization utilizes method, can effectively solve the problems in background technique.

To achieve the above object, the present invention proposes: a kind of photovoltaic pickle liquor zero-emission and resource utilization method, by with Lower step carries out:

(1) three-level chemical precipitation fluorine removal: level-one chemical precipitation section mainly passes through Ca (OH)₂Fluorine removal first transports to mixed acid waste liquor PH conditioning tank adds Ca (OH)₂Waste liquor PH is adjusted to 7.0-9.0, and following reaction occurs:

Ca(OH)₂ + HF → CaF₂↓+ H₂O

Calcirm-fluoride is formed in waste liquid and enters level-one coagulating basin, and dosing coagulant and flocculant are mixed into level-one precipitating in pond Pond, since calcium fluoride sludge amount is larger, sludge settling effect is poor, therefore mud mixture full dose input sludge filter press is taken off Water, calcium fluoride sludge transport to sludge treatment system, and filter press filtrate enters secondary chemical settling system；

Secondary chemical precipitating phase mainly passes through CaCl₂Fluorine removal adjusts pH to 7.0- using NaOH first in second level conditioning tank 9.0, waste liquid maintains alkaline state to enter two-stage coagulation pond, and CaCl is added in pond₂Enter two-stage precipitation with after flocculant mixing Pond, and following reaction occurs:

CaCl₂ + HF + NaOH → CaF₂↓+ NaCl + H₂O

Second-level settling pond part CaF₂Sludge reflux and level-one coagulating basin, the higher dirt needed for maintaining level-one coagulating basin uniformly to flocculate Mud concentration, sludge circulation rate are usually 5-10%；Remaining CaF₂Mud discharging to sludge treatment system, supernatant enters three-level Learn settling system；

Three-level chemical precipitation section mainly passes through NaCO₃Deliming adds NaCO in three-level coagulating basin₃It mixes, occurs with flocculant It reacts below:

CaCl₂ + NaCO₃→ CaCO₃↓+ NaCl

The water outlet of three-level coagulating basin enters three-level sedimentation basin, CaCO₃For mud discharging to sludge treatment system, it is former that supernatant enters evaporation Water pot；

Waste water by three-level chemical precipitation handle, fluorine ion, calcium ion and organic concentration sharp fall, add NaOH and NaCO₃Sodium ion is introduced into waste water system, three-level precipitating water outlet Main Salts are NaCl and NaNO₃；

(2) be concentrated by evaporation: three-level chemical precipitation water outlet use MVR(mechanical steam recompression) or multiple-effect evaporation carry out it is dense Contracting, waste water by plate heat exchanger increase temperature of charge, enter back into evaporator, in evaporator tube after being pressurizeed by feed pump Material makes raw material heat up with pipe external heat steam heat-exchanging, and the material after heating enters evaporation separation chamber and carries out flash vaporization, evaporation The vapor entrainment portions drop of generation passes through demister separator, and separator separates the drop in vapor from steam and removes It goes to form secondary steam, such as uses MVR technique, then secondary steam enters back into compressor, and vapor is compressed by the compressor rear temperature And pressure rise, the secondary steam of higher temperature, which enters cryogenic vaporizer shell side and manages interior raw material, to exchange heat, and secondary steam is released latent Heat is condensed into condensed water；Using multiple-effect evaporation technique, secondary steam enters in next step as heat source, then generates condensation Water；Condensed water is entered plate heat exchanger after the bottom of heat exchanger is collected and is gone out outside system using its waste heat heel row；

(3) sub-prime crystallizes: NaCl and NaNO in waste liquid₃It is gradually saturated after being concentrated by evaporation, it will by the way of sub-prime crystallization Two kinds of salinities are separated from waste liquid respectively；Sub-prime crystallization mainly utilizes NaCl and NaNO₃Dissolubility difference at different temperatures, The salinity that saturation is precipitated is separated；Figure it is seen that the variation of NaCl solubility with temperature is less, and NaNO₃Solubility It increases and becomes larger with temperature；

When being evaporated to sodium chloride saturation analysis salt, feed liquid extraction evaporator is transported into first-stage centrifugal machine and is separated by solid-liquid separation, separation knot Brilliant salt is the NaCl of high-purity；Centrifugal filtrate is collected to cold crystallization tank, and cooling water heat exchange is passed through, and reduces feed liquid temperature to 40-50 Degree, NaNO₃Crystallization is precipitated, by NaNO₃Crystallization mixture transports to two-stage centrifugal machine, and separation crystal salt is the NaNO of high-purity₃；From Heart filtrate returns to vapo(u)rization system and continues to be concentrated, repeatedly, constantly by NaCl and NaNO₃It crystallizes and isolates system；

(4) advanced treating: contain a large amount of low boiling points, volatile organic compound and ammonia nitrogen compound in mixed acid waste liquor, steaming During hair, low boiling organic matter enters in condensate liquid, evaporation water outlet COD and ammonia nitrogen concentration is higher is unable to direct emission, needs to carry out Advanced treating is to meet discharge or reuse standard；It is handled using biochemical method, it is low to make good use of the degradation of oxygen activity sludge absorption Organic matter is boiled, and is nitrate nitrogen by mineralized nitrogen, converts nitrogen for nitrate nitrogen denitrification under anoxic conditions；Bio-chemical effluent can Direct emission, or handle into membranous system to recycle water standard；Membranous system uses bi-membrane method, the i.e. reverse osmosis work of combining ultrafiltration Skill；Ultrafiltration retains the suspended matter in bio-chemical effluent, enters counter-infiltration system, reverse osmosis retention salinity, organic matter after reducing turbidity It is back to photovoltaic products production Deng, reverse osmosis water outlet, reverse osmosis concentrated liquid returns to vapo(u)rization system, and thus waste liquid constructs zero-emission system System；

(5) solid recycling: the CaF of second-level settling pond discharge₂Sludge enters expects utilization system admittedly, after sludge dewatering, It is dried after being mixed with the dry mud after level-one precipitating sludge filters pressing, to reduce moisture content and obtain CaF₂Product；CaF₂Product pair Outer sale, for fields such as manufacture of cement, concrete manufacture, flying ash immobilizations；

The CaCO of three-level sedimentation basin discharge₃Sludge enters expects utilization system admittedly, is dried after sludge dewatering, to reduce Moisture content simultaneously obtains CaCO₃Product；CaCO₃Product is externally sold, and is manufactured for building trade manufacture of cement and concrete；

The NaCl and NaNO that evaporator section obtains₃Crystallization purity is more than 90%, can be used as industrial chemicals product and externally sells；

The solid material CaF that waste treatment process generates as a result,₂、CaCO₃, NaCl and NaNO₃Produce whole resource utilizations.

Compared with prior art, the beneficial effects of the present invention are: by chemical precipitation method, evaporative crystallization method, membrane separation process, life Change method combines, group technology high treating effect, and investment and operating cost are lower, while constructing mixed acid waste liquor zero-emission and money Source processing system.

Detailed description of the invention

Fig. 1 is a kind of flow chart of the zero-emission of photovoltaic pickle liquor and resource utilization method of the present invention；

Fig. 2 is NaCl and NaNO when sub-prime crystallizes in a kind of photovoltaic pickle liquor zero-emission of the present invention and resource utilization method₃ Solubility schematic diagram at different temperatures.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments；It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Referring to FIG. 1-2, the present invention the following technical schemes are provided:

Certain photovoltaic enterprise uses

Pickle liquor treating capacity is 5 t/h, and waste liquid contains HF mass fraction 5-10%；HNO₃Mass fraction 10-20%；Its spent acid matter Measure score 1%；

By pickle liquor processing method of the invention, sequentially include the following steps:

(1) three-level chemical precipitation fluorine removal: level-one chemical precipitation section mainly passes through Ca (OH)₂Fluorine removal first transports to mixed acid waste liquor PH conditioning tank adds Ca (OH)₂Waste liquor PH is adjusted to 7.0-9.0, calcirm-fluoride is formed in waste liquid and enters level-one coagulating basin, in pond Add 100-1000 mg/L coagulant (aluminium polychloride, bodied ferric sulfate or polyaluminum ferric chloride) and 10-100 mg/L flocculation Agent (polyacrylamide) is mixed into first stage precipitation tank；Since calcium fluoride sludge amount is larger, sludge settling effect is poor, therefore by muddy water Mixture full dose input sludge filter press (chamber-type press filter, folded spiral shell machine or Horizontal helical type centrifuge) is dehydrated；Calcium fluoride sludge (moisture content 60-80%) transports to sludge treatment system, and filter press filtrate enters secondary chemical settling system；

Secondary chemical precipitating phase mainly passes through CaCl₂Fluorine removal adds 20-40% mass concentration in second level conditioning tank first NaOH adjusts pH to 7.0-9.0, and waste liquid maintains alkaline state to enter two-stage coagulation pond, CaCl is added in pond₂And 10-100 Enter second-level settling pond, CaCl after mg/L flocculant (PAM) mixing₂Dosage is 10-100 g/L, need to guarantee to be discharged fluorine ion Concentration is less than 10 mg/L；

Second-level settling pond part CaF₂Sludge reflux and level-one coagulating basin, the higher dirt needed for maintaining level-one coagulating basin uniformly to flocculate Mud concentration, sludge circulation rate are usually 5-10%；Remaining CaF₂Mud discharging to sludge treatment system, supernatant enters three-level Learn settling system；

Three-level chemical precipitation section mainly passes through NaCO₃Deliming adds NaCO in three-level coagulating basin₃It flocculates with 10-100 mg/L Agent (PAM) mixing, NaCO₃Dosage is 5-50 g/L, need to guarantee to be discharged calcium ion concentration less than 200 mg/L；

The water outlet of three-level coagulating basin enters three-level sedimentation basin, CaCO₃For mud discharging to sludge treatment system, it is former that supernatant enters evaporation Water pot；

Waste water by three-level chemical precipitation handle, fluorine ion, calcium ion and organic concentration sharp fall, add NaOH and NaCO₃Sodium ion is introduced into waste water system, three-level precipitating water outlet Main Salts are NaCl and NaNO₃；

(2) be concentrated by evaporation: three-level chemical precipitation water outlet uses MVR(mechanical steam recompression) it is concentrated；Waste water is by feeding Temperature of charge is set to be increased to 70-80 °C by plate heat exchanger after pump pressurization；It enters back into evaporator, the material in evaporator tube Raw material is set to be warming up to 90-100 °C with pipe external heat steam heat-exchanging, the material after heating enters evaporation separation chamber and carries out flash distillation steaming Hair, evaporates the vapor entrainment portions drop of generation by demister separator, and separator is the drop in vapor from steam In be separated off to form secondary steam；Secondary steam enters back into compressor, and vapor is compressed by the compressor rear temperature and is increased to 105-115 °C, the secondary steam of higher temperature enters in cryogenic vaporizer shell to exchange heat with raw material in pipe, and secondary steam releases latent heat It is condensed into 100 °C of condensed waters；Condensed water is entered plate heat exchanger after the bottom of heat exchanger is collected and is gone out using its waste heat heel row Outside system；

(3) sub-prime crystallizes: NaCl and NaNO in waste liquid₃It is gradually saturated after being concentrated by evaporation, it will by the way of sub-prime crystallization Two kinds of salinities are separated from waste liquid respectively；

It is evaporated to sodium chloride saturation analysis salt, when waste liquid solid content is 5-10%, feed liquid extraction evaporator is transported into first-stage centrifugal machine It is separated by solid-liquid separation, separation crystal salt is the NaCl of 90-95% purity；Centrifugal filtrate is collected to cold crystallization tank, is passed through cooling water and is changed Heat reduces feed liquid temperature to 40-50 degree, NaNO₃Crystallization is precipitated, by NaNO₃Crystallization mixture transports to two-stage centrifugal machine, separation knot Brilliant salt is the NaNO of 90-95% purity₃；Centrifugal filtrate returns to vapo(u)rization system and continues to be concentrated, repeatedly, constantly by NaCl and NaNO₃It crystallizes and isolates system；

(4) advanced treating: contain a large amount of low boiling points, volatile organic compound and ammonia nitrogen compound in mixed acid waste liquor, steaming During hair, low boiling organic matter enters in condensate liquid, and evaporation effluent COD concentration is 500-5000 mg/L, ammonia nitrogen concentration 30- 300 mg/L, the two concentration is higher to be unable to direct emission, need to carry out advanced treating to meet discharge or reuse standard；

Handled first using biochemical method, biochemical process is AAO(anaerobic- anoxic- oxic), low boiling organic matter is become reconciled in anaerobism Oxygen section is decomposed into carbon dioxide and water, and ammonia nitrogen is converted into nitrate nitrogen in aerobic section, by flowing back under anoxic conditions by nitrate nitrogen Denitrification is converted into nitrogen；Bio-chemical effluent COD is lower than 100 mg/L, and ammonia nitrogen is lower than 10 mg/L, and total nitrogen is lower than 20 mg/L, the stock Waste water can direct emission, or handle to recycle water standard into membranous system；Membranous system use bi-membrane method, i.e., ultrafiltration (rolled film, Tubular membrane, curtain type membrane or middle control tunica fibrosa) combine reverse osmosis (rolled film or dish-style film) technique；Ultrafiltration retains in bio-chemical effluent Suspended matter, SS concentration are reduced to 5mg/L hereinafter, then entering counter-infiltration system, reverse osmosis retention salinity, organic matter etc., reverse osmosis It appears water COD and is lower than 50 mg/L lower than 10 mg/L, TDS, be back to photovoltaic products production；Membranous system producing water ratio is 80-98%, The reverse osmosis concentrated liquid of 2-20% returns to vapo(u)rization system, and thus waste liquid constructs Zero discharging system；

(5) solid recycling: the CaF of second-level settling pond discharge₂Sludge enters expects utilization system admittedly, after sludge dewatering, It is dried after being mixed with the dry mud after level-one precipitating sludge filters pressing, obtains the CaF of moisture content 5-10%₂Product；CaF₂Product pair Outer sale, for fields such as manufacture of cement, concrete manufacture, flying ash immobilizations；

The CaCO of three-level sedimentation basin discharge₃Sludge enters expects utilization system admittedly, is dried after sludge dewatering, acquisition contains The CaCO of water rate 5-10%₃Product；CaCO₃Product is externally sold, and is manufactured for building trade manufacture of cement and concrete；

The NaCl and NaNO that evaporator section obtains₃Crystallization purity is 90-95%, can be used as industrial chemicals product and externally sells；

The solid material CaF that waste treatment process generates as a result,₂、CaCO₃, NaCl and NaNO₃Produce whole resource utilizations.

It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (1)

1. a kind of photovoltaic pickle liquor zero-emission and resource utilization method, it is characterised in that: sequentially include the following steps:

(1) three-level chemical precipitation fluorine removal: level-one chemical precipitation section mainly passes through Ca (OH)₂Mixed acid waste liquor is transported to pH first by fluorine removal Conditioning tank adds Ca (OH)₂Waste liquor PH is adjusted to 7.0-9.0, and following reaction occurs:

Ca(OH)₂ + HF → CaF₂↓+ H₂O

Calcirm-fluoride is formed in waste liquid and enters level-one coagulating basin, and dosing coagulant and flocculant are mixed into level-one precipitating in pond Pond, since calcium fluoride sludge amount is larger, sludge settling effect is poor, therefore mud mixture full dose input sludge filter press is taken off Water, calcium fluoride sludge transport to sludge treatment system, and filter press filtrate enters secondary chemical settling system；

Secondary chemical precipitating phase mainly passes through CaCl₂Fluorine removal adjusts pH to 7.0-9.0 using NaOH first in second level conditioning tank, Waste liquid maintains alkaline state to enter two-stage coagulation pond, and CaCl is added in pond₂Enter second-level settling pond with after flocculant mixing, and And following reaction occurs:

CaCl₂ + HF + NaOH → CaF₂↓+ NaCl + H₂O

Second-level settling pond part CaF₂Sludge reflux and level-one coagulating basin, the higher dirt needed for maintaining level-one coagulating basin uniformly to flocculate Mud concentration, sludge circulation rate are usually 5-10%；Remaining CaF₂Mud discharging to sludge treatment system, supernatant enters three-level Learn settling system；

Three-level chemical precipitation section mainly passes through NaCO₃Deliming adds NaCO in three-level coagulating basin₃With flocculant mix, occur with Lower reaction:

CaCl₂ + NaCO₃→ CaCO₃↓+ NaCl

The water outlet of three-level coagulating basin enters three-level sedimentation basin, CaCO₃For mud discharging to sludge treatment system, it is former that supernatant enters evaporation Water pot；

Waste water by three-level chemical precipitation handle, fluorine ion, calcium ion and organic concentration sharp fall, add NaOH and NaCO₃Sodium ion is introduced into waste water system, three-level precipitating water outlet Main Salts are NaCl and NaNO₃；

(2) be concentrated by evaporation: three-level chemical precipitation water outlet use MVR(mechanical steam recompression) or multiple-effect evaporation carry out it is dense Contracting, waste water by plate heat exchanger increase temperature of charge, enter back into evaporator, in evaporator tube after being pressurizeed by feed pump Material makes raw material heat up with pipe external heat steam heat-exchanging, and the material after heating enters evaporation separation chamber and carries out flash vaporization, evaporation The vapor entrainment portions drop of generation passes through demister separator, and separator separates the drop in vapor from steam and removes It goes to form secondary steam, such as uses MVR technique, then secondary steam enters back into compressor, and vapor is compressed by the compressor rear temperature And pressure rise, the secondary steam of higher temperature, which enters cryogenic vaporizer shell side and manages interior raw material, to exchange heat, and secondary steam is released latent Heat is condensed into condensed water；Using multiple-effect evaporation technique, secondary steam enters in next step as heat source, then generates condensation Water；Condensed water is entered plate heat exchanger after the bottom of heat exchanger is collected and is gone out outside system using its waste heat heel row；

(3) sub-prime crystallizes: NaCl and NaNO in waste liquid₃It is gradually saturated after being concentrated by evaporation, by two by the way of sub-prime crystallization Kind salinity is separated from waste liquid respectively；Sub-prime crystallization mainly utilizes NaCl and NaNO₃Dissolubility difference at different temperatures, will The salinity that saturation is precipitated is separated；The variation of NaCl solubility with temperature is little, and NaNO₃Solubility with temperature increases and becomes Greatly；

When being evaporated to sodium chloride saturation analysis salt, feed liquid extraction evaporator is transported into first-stage centrifugal machine and is separated by solid-liquid separation, separation knot Brilliant salt is the NaCl of high-purity；Centrifugal filtrate is collected to cold crystallization tank, and cooling water heat exchange is passed through, and reduces feed liquid temperature to 40-50 Degree, NaNO₃Crystallization is precipitated, by NaNO₃Crystallization mixture transports to two-stage centrifugal machine, and separation crystal salt is the NaNO of high-purity₃；From Heart filtrate returns to vapo(u)rization system and continues to be concentrated, repeatedly, constantly by NaCl and NaNO₃It crystallizes and isolates system；

(4) advanced treating: contain a large amount of low boiling points, volatile organic compound and ammonia nitrogen compound in mixed acid waste liquor, steaming During hair, low boiling organic matter enters in condensate liquid, evaporation water outlet COD and ammonia nitrogen concentration is higher is unable to direct emission, needs to carry out Advanced treating is to meet discharge or reuse standard；It is handled using biochemical method, it is low to make good use of the degradation of oxygen activity sludge absorption Organic matter is boiled, and is nitrate nitrogen by mineralized nitrogen, converts nitrogen for nitrate nitrogen denitrification under anoxic conditions；Bio-chemical effluent can Direct emission, or handle into membranous system to recycle water standard；Membranous system uses bi-membrane method, the i.e. reverse osmosis work of combining ultrafiltration Skill；Ultrafiltration retains the suspended matter in bio-chemical effluent, enters counter-infiltration system, reverse osmosis retention salinity, organic matter after reducing turbidity It is back to photovoltaic products production Deng, reverse osmosis water outlet, reverse osmosis concentrated liquid returns to vapo(u)rization system, and thus waste liquid constructs zero-emission system System；

(5) solid recycling: the CaF of second-level settling pond discharge₂Sludge enters expects utilization system admittedly, after sludge dewatering, with It is dried after dry mud mixing after level-one precipitating sludge filters pressing, to reduce moisture content and obtain CaF₂Product；CaF₂Product is external It sells, for fields such as manufacture of cement, concrete manufacture, flying ash immobilizations；

The CaCO of three-level sedimentation basin discharge₃Sludge enters expects utilization system admittedly, is dried after sludge dewatering, to reduce Moisture content simultaneously obtains CaCO₃Product；CaCO₃Product is externally sold, and is manufactured for building trade manufacture of cement and concrete；

The NaCl and NaNO that evaporator section obtains₃Crystallization purity is more than 90%, can be used as industrial chemicals product and externally sells；

The solid material CaF that waste treatment process generates as a result,₂、CaCO₃, NaCl and NaNO₃Produce whole resource utilizations.