CN114349302A - Sludge decrement liquid caustic soda and manufacturing process thereof - Google Patents
Sludge decrement liquid caustic soda and manufacturing process thereof Download PDFInfo
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Abstract
The invention belongs to the field of sewage treatment, and particularly relates to sludge reduction liquid caustic soda and a manufacturing process thereof, wherein the sludge reduction liquid caustic soda comprises liquid caustic soda base material and water, and the liquid caustic soda base material comprises the following components in percentage by weight: 16-18% of calcium-based coagulant, 8-10% of nano-grade dispersing suspension agent and 5-7% of carbonic acid scavenger; the weight ratio of the liquid caustic soda base material to the water is 3: 7. the sludge reduction liquid caustic soda is mainly applied to acid wastewater treatment and waste gas desulfurization, the sludge reduction liquid caustic soda has the effect of completely replacing sodium hydroxide by 1:1, the usage amount is smaller, the treatment cost is reduced to the minimum, all the manufacturing processes are manufactured by using pure natural raw materials, the cost is ensured to be low, and the production is easy. Can replace expensive and dangerous chemicals, has stable chemical components and stable use effect, and does not contain impurities of other components. Meanwhile, the cost of enterprise wastewater treatment can be reduced, the problem of environmental dust pollution of a wastewater treatment workshop is reduced, the risk of danger is reduced, and the stability and small fluctuation of the whole wastewater treatment process are ensured.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to the field of acidic industrial wastewater treatment.
Background
In the past for hundreds of years, the industrial sewage treatment alkali is mainly divided into two types, namely sodium hydroxide products and lime processing products, but the defects of the products are obvious;
sodium hydroxide, a product related to sodium hydroxide such as flake caustic, granular caustic and liquid caustic soda has the following disadvantages:
1. belongs to dangerous chemical engineering and has high management cost.
2. Expensive and greatly affected by market fluctuations.
3. Can only adjust the PH value and can not play the additional function required in the sewage treatment.
The defects of lime and lime processing products are as follows:
1. when the lime powder is used, dust can be raised, and the environmental pollution is great.
2. Because it is slightly soluble in water and has low solubility, the reaction speed is slow and the utilization rate is low.
3. The sewage treatment generates much sludge, which results in high rear-end sludge disposal cost.
4. The scaling and pipe plugging are easily caused, the cleaning time is frequent, and the cost is heavy.
The technical problem to be solved by the invention is as follows: 1. sodium hydroxide belongs to dangerous chemical industry, and is with high costs, can only adjust the pH value, can not play the extra function of demand in the sewage treatment. 2. When lime and lime processing products are used, dust raising is caused to cause great pollution to the environment, the reaction speed is low, the utilization rate is low, and meanwhile, sludge generated in sewage treatment is more likely to cause scaling and pipe plugging.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the sludge reduction liquid caustic soda and the manufacturing process thereof, the sludge reduction liquid caustic soda is applied to the acid wastewater treatment and the waste gas desulfurization, the sludge reduction liquid caustic soda has the effect of completely replacing sodium hydroxide by 1:1, even the usage amount is smaller, the treatment cost is reduced to the minimum, all the manufacturing processes are manufactured by using pure natural raw materials, the cost is ensured to be low, and the production is easy. The invention can replace expensive and dangerous chemicals, has stable chemical components, stable use effect and no impurities of other components. Meanwhile, the industrial wastewater treatment cost of enterprises can be reduced, the problem of environmental dust pollution of wastewater treatment workshops is reduced, the risk of danger is reduced, the use amount of the medicament reaches the best, the medicament waste is reduced, and the stability and small fluctuation of the whole process of wastewater treatment are ensured. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the sludge decrement liquid caustic soda comprises liquid caustic soda base material and water, wherein the liquid caustic soda base material comprises the following components in percentage by weight: 16-18% of calcium-based coagulant, 8-10% of nano-grade dispersing suspension agent and 5-7% of carbonic acid scavenger;
the weight ratio of the liquid caustic soda base material to the water is 3: 7.
the calcium-based coagulant has the following functions: providing sufficient hydroxide for adjusting the pH value and providing sufficient coagulation capacity; the industrial wastewater impurity precipitation speed is increased, and the sludge-water separation speed is increased; the sludge flocs are stable, the water content of the pressed sludge can be reduced, the sludge amount is reduced, and the enterprise cost is reduced. Function of the nano-scale dispersing suspending agent: the calcium-based coagulant is fully dispersed in the liquid, and the fluidity of the calcium-based coagulant is increased, so that the liquid is stable and is not layered; the calcium-based coagulant is dispersed in the liquid, so that the time for dissolving the medicine is shortened, the reaction speed is accelerated, and the wastewater treatment efficiency is improved; the method has the advantages that the effect of the calcium-based coagulant is ensured, the adhesion of the redundant calcium-based coagulant on the wall of the pipeline is reduced, the occurrence of scaling is reduced, the stability of the industrial wastewater treatment process is ensured, and other expenses are not increased. The action of a carbonic acid scavenger; the storage time of the sludge decrement liquid caustic soda is prolonged, the scaling and calcification of the sludge decrement liquid caustic soda are prevented, and meanwhile, automatic dosing systems such as pipelines and pumps can be protected.
Further, the liquid alkali base stock comprises the following components in percentage by weight: 17% of calcium-based coagulant, 9% of nano-scale dispersion suspending agent and 6% of carbonic acid scavenger.
Further, the calcium-based coagulant provides hydroxide for adjusting the pH value, and the calcium-based coagulant is provided with stable sludge flocs.
Further, the nano-scale dispersing and suspending agent is polyacrylamide, and the polyacrylamide is used for increasing the fluidity of the calcium-based coagulant.
Further, the carbon acid scavenger is sodium acetate, which is used to prolong the storage time of the sludge reduction liquid alkali, and is used to prevent scaling and calcification of the sludge reduction liquid alkali.
Further, the method comprises the following sludge decrement liquid caustic soda manufacturing process steps:
s1, high-temperature high-pressure stirring: firstly adding 1 part by weight of lime powder and then injecting 9 parts by weight of water into a high-temperature high-pressure stirrer for mixing and stirring, wherein the stirring speed is 120 revolutions per minute, the pressure value is 1.7 MPa, the temperature is 300 ℃, and the digestion is carried out for 3 hours to prepare a semi-finished liquid of the calcium-based coagulant, and the reaction formula is as follows:
CaO+H2O→Ca(OH)2
s2, impurity removal: reducing the temperature to 75 ℃, regulating the air pressure value to be atmospheric pressure value, sieving the half-finished calcium-based coagulant with a 1000-mesh sieve, and removing stones and insoluble impurities to prepare a standby calcium-based coagulant solution;
s3, sampling, regulating and detecting, namely sampling and detecting the standby liquid of the calcium-based coagulant, and regulating and controlling the calcium content to be 16% and the alkalinity to be 32% in the standby liquid of the calcium-based coagulant to prepare the calcium-based coagulant;
s4, adding medicine and cooling: adding 8% of dispersing suspending agent and 5% of carbonic acid scavenger into the calcium-based coagulant, stirring at the speed of 180 revolutions per minute until the temperature is reduced to room temperature, and preparing a sludge reduction liquid caustic soda semi-finished product;
s5, sieving: the sludge decrement liquid caustic soda semi-finished product is screened by a 300-mesh screen to remove larger particles or blocky paste, and the sludge decrement liquid caustic soda is prepared;
s6, storing a finished product: and (4) filling the sludge decrement liquid caustic soda into a medicine storage tank for use.
Further, the calcium content and basicity were 1: 2, regulating and controlling the calcium content in the standby liquid of the calcium-based coagulant comprises two modes:
A. sampling to detect that the content of calcium in the standby liquid of the calcium-based coagulant is lower than 16%, and increasing the content of calcium in the standby liquid of the calcium-based coagulant by heating and evaporating water to prepare the standby liquid of the calcium-based coagulant with the calcium content stabilized at 16%;
B. sampling and detecting that the content of calcium in the standby liquid of the calcium-based coagulant is higher than 16%, and reducing the content of calcium in the standby liquid of the calcium-based coagulant by injecting water to prepare the standby liquid of the calcium-based coagulant with the calcium content stabilized at 16%.
Furthermore, the acid-insoluble substance in the sludge reduction liquid alkali is less than or equal to 0.3 percent, the calcium content of the calcium-based coagulant is 16 to 18 percent, the alkalinity is 25 percent +1 percent, the pH value is more than or equal to 11, and the relative molecular mass is 38.05.
The invention has the beneficial effects that:
1. the metal ion capturing capacity is higher, and the standard reaching safety is higher;
2. the coagulant has the function of reducing the use amount of PAM (polyacrylamide) and PAC (polyaluminium chloride), so that the effluent after sewage treatment is clearer;
3. calcium ions in the sludge decrement liquid caustic soda can react with fluoride ions in the wastewater to generate precipitates, so that the content of the fluoride ions is reduced, and the safety of standard-reaching discharge of the fluoride ions is higher;
4. has the functions of auxiliary decoloration and water purification which are not possessed by caustic soda flakes and liquid caustic soda;
5. the adoption of the sludge decrement liquid alkali treatment mode can not affect the treatment effect of other emission indexes and can not cause secondary pollution;
6. the hardening effect is achieved, the added polypropylene during squeezing is greatly reduced or no polypropylene is added, and the water content is reduced by about 5-8% compared with that of caustic soda flakes;
7. compared with lime, the service life of advanced treatment modules in the sewage treatment process can be prolonged, such as MBR (membrane biological reactor), ultrafiltration membranes, calcification of a biochemical system and the like;
8. the invention is a liquid product, which can reduce the time for dissolving the drug, improve the treatment capacity of industrial wastewater and accelerate the treatment speed;
9. the liquid state can be controlled through pipeline, pump, continuation of the electric appliance, ball valve and pH meter, reaches the automatic medicine that dissolves, adds the medicine and opens the effect of opening and stopping and the accurate control of quantity, reduces workman's burden, reduces waste water treatment's cost.
Drawings
FIG. 1 is a schematic view of the steps of the sludge reduction liquid caustic soda manufacturing process.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the present invention will be further described with reference to the following embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides a technical solution: the sludge decrement liquid caustic soda comprises liquid caustic soda base material and water, wherein the liquid caustic soda base material comprises the following components in percentage by weight: 16% of calcium-based coagulant, 8% of nano-scale dispersion suspending agent and 5% of carbonic acid scavenger;
the weight ratio of the liquid caustic soda base material to the water is 3: 7.
referring to fig. 1, the sludge-reduced liquid caustic soda includes the following steps:
s1, high-temperature high-pressure stirring: firstly adding 1 weight part of lime powder and then injecting 9 weight parts of water into a high-temperature high-pressure stirrer, covering a cover of the high-temperature high-pressure stirrer to achieve a closed environment, then mixing and stirring, wherein the stirring speed is 120 revolutions per minute, the temperature is 300 ℃, the pressure value is increased to 1.7 MPa along with the temperature rise, the digestion is carried out for 3 hours, the lime is fully dissolved in the water at high temperature and high pressure, and simultaneously fully reacts with the water to prepare a calcium hydroxide solution, namely the semi-finished calcium-based coagulant is prepared, and the reaction formula is as follows:
CaO+H2O→Ca(OH)2
s2, impurity removal: reducing the temperature to 75 ℃, regulating the air pressure value to be atmospheric pressure value, sieving the half-finished calcium-based coagulant with a 1000-mesh sieve, and removing stones and insoluble impurities to prepare a standby calcium-based coagulant solution;
s3, sampling, regulating and detecting, namely sampling and detecting the standby liquid of the calcium-based coagulant, and regulating the calcium content of the standby liquid of the calcium-based coagulant to be 16% and the alkalinity to be 32% to prepare the calcium-based coagulant, wherein the calcium content and the alkalinity of the standby liquid of the calcium-based coagulant are 1: 2, the modes of regulating and controlling the calcium content in the standby liquid of the calcium-based coagulant are divided into two modes:
A. sampling to detect that the content of calcium in the standby liquid of the calcium-based coagulant is lower than 16%, and increasing the content of calcium in the standby liquid of the calcium-based coagulant by heating and evaporating water to prepare the calcium-based coagulant with the calcium content stabilized at 16%;
B. sampling to detect that the content of calcium in the standby liquid of the calcium-based coagulant is higher than 16%, and reducing the content of calcium in the standby liquid of the calcium-based coagulant by injecting water to prepare the calcium-based coagulant with the calcium content stabilized at 16%;
s4, adding medicine and cooling: adding 8% of dispersing suspending agent and 5% of carbonic acid scavenger into the calcium-based coagulant, stirring at the speed of 180 revolutions per minute until the temperature is reduced to room temperature, and preparing a sludge reduction liquid caustic soda semi-finished product;
s5, sieving: the sludge decrement liquid caustic soda semi-finished product is screened by a 300-mesh screen to remove larger particles or blocky paste, and the sludge decrement liquid caustic soda is prepared;
s6, storing a finished product: and (4) filling the sludge decrement liquid caustic soda into a medicine storage tank for use.
The use effect of the finished products prepared in example 1 and comparative examples 1 to 4 was evaluated, and the raw material composition ratios in example 1 and comparative examples 1 to 4 are shown in the following table 1 (in 100%):
TABLE 1
From Table 1, data on the ratios of the raw material components in example 1 and comparative examples 1 to 3 can be obtained
The evaluation method comprises the following steps: because the component contents are different, the influence on the production process is large, the comparison and evaluation is divided into a production part and a use part for comparison, each component distribution ratio is averaged by a numerical value of 10 times of production, and the comparison and evaluation are carried out. The comparative evaluation results are as follows:
the evaluation method comprises the following steps: and recording the batch reply condition. The results of the experimental evaluation are shown in table 2 below:
TABLE 2
The experimental evaluation results of example 1 and comparative examples 1 to 4 can be obtained from table 2, and it is found through many times of production with different formulas that the analysis and use effects of alkalinity, use effect, and sludge reduction capacity are similar, but mainly the difference appears in production, the amounts of reagents used in different formulas are different, and in the process of slaking lime at high temperature and high pressure, the reaction temperature, the reaction time, the reagent addition amount, the stirring speed and the like are different greatly, so that the production cost deviation is extremely large. The use of the nano-scale dispersing suspending agent can ensure the liquidity of the liquid, simultaneously reduce the reaction time on the digestion process, and ensure that the calcium hydroxide can be fully dispersed in the liquid, thereby increasing the treatment speed of the industrial wastewater. The carbonic acid scavenger can prolong the service life of the sludge reduction liquid alkali and simultaneously remove the occurrence of scaling in the processes of production, transportation, storage and use. Example 1 shows that the formula ratio and the production mode are better after multiple production comparisons.
The invention is further illustrated by the following experiments:
the main contents of the comparative experiment of sludge decrement liquid caustic soda and caustic soda flakes under the condition that the test sewage is 1L of the acid battery wastewater are shown in the following table 3:
TABLE 3
From the above table 3, it is concluded that 1.1. compared with caustic soda flakes, the amount of caustic soda solids in sludge with 25% concentration reduction should be 4 times, and the average result of the experiment is 2.87 times, i.e. more effective substances and higher utilization rate in sewage treatment, and the amount of sludge produced is equal to that produced by using caustic soda flakes.
1.2. The sludge decrement liquid caustic soda contains calcium ions, has coagulation effect which is not possessed by caustic soda flakes, can reduce the consumption of PAC (polyaluminium chloride), even completely replace the PAC, saves the cost and achieves the effect of water purification.
The main contents of the comparative experiment of the sludge decrement liquid caustic soda and the flake caustic soda under the condition that the test sewage is 1L of the carbon steel pickling wastewater are shown in the following table 4:
TABLE 4
From the above table 4, 2.1, compared with the caustic soda flakes, the solid dosage of the liquid caustic soda with the concentration of 25% is calculated to be 4 times, and the average result of the test is 3.43 times, that is, more effective substances and higher utilization rate are available in sewage treatment, and the generated sludge is reduced by 15.69% compared with the on-site alkali, because sodium nitrate generated by sodium hydroxide and nitric acid is in a saturated state and is left in the sludge after being dried, the thickness of the sludge is obviously larger than that of the sludge reduction liquid caustic soda. And a small amount of calcium ions in the sludge reduction liquid alkali react with nitric acid to form calcium nitrate which is dissolved in a water body, the calcium nitrate is not saturated, and only heavy metal, sodium nitrate and a small amount of calcium nitrate salt are obtained after drying.
The main contents of the comparative experiment of the sludge reduction liquid caustic soda and flake caustic soda + lime (1: 4) under the condition that the test sewage is 400ml of the aluminum material oxidation strong acid tank liquor are shown in the following table 5:
TABLE 5
From the above table 5, 3.1, the calculated alkali solid dosage of the sludge decrement liquid alkali with the concentration of 25% should be 4 times of the calculated alkali solid dosage compared with the site mixed alkali, and the average result of the test is 2.52 times, namely, the effective substances are more and the utilization rate is higher during the sewage treatment, the produced sludge is reduced by 11.02% compared with the site alkali, and the sludge production is less.
3.2. 60 tons of lime and 20 tons of caustic soda flakes are used in one month on site, pure manual medicine pouring and dissolving are adopted, time and labor are wasted, the operation is unsafe, the liquid caustic soda with reduced sludge amount is filled in a common PE15 ton barrel, the pump, the ball valve and the pH meter are used for linkage, the full-automatic medicine adding is realized, the manual operation is reduced, the risk of manual medicine adding is eliminated, the safety index is increased, and meanwhile, the environmental pollution is reduced.
The main contents of the comparative experiment of the sludge decrement liquid caustic soda and lime under the condition that the test sewage is 1L of the electroplating copper-containing wastewater are shown in the following table 6:
TABLE 6
From the above table 6, it can be concluded that 4.1. compared with lime used on site, the liquid caustic soda amount for sludge reduction with 25% concentration should be 4 times, and the average result of the current experiment is 2.55 times, i.e. more effective substances and higher utilization rate in sewage treatment, the sludge generation is reduced by 14.66% compared with that of the alkali used on site, and the sludge generation is less.
4.2. Through experiments, the plant uses lime to treat the copper-containing wastewater, the copper content of the sludge is only 5.21 percent, the local recovery requirement cannot be met, the sludge treatment cost is up to 2100 yuan per ton, the solid content of sludge impurities is reduced through sludge reduction liquid alkali treatment, the copper content of the sludge reaches 8.14 percent, the local recovery requirement is met, the sludge can be treated freely, and the operation cost can be greatly reduced for enterprises.
4.3. The lime used in one month on site is 90 tons, and is poured and dissolved by pure manual work, time and labor are wasted, the lime is unsafe, the sludge reduction liquid caustic soda is charged by a common PE (polyethylene) ton barrel, and the pump, the ball valve and the pH meter are linked to realize full-automatic dosing, so that the labor is reduced, the risk of manual dosing is eliminated, the safety index is increased, and the environmental pollution is reduced.
The main contents of the comparison experiment of the sludge reduction liquid caustic soda, the liquid desulfurizing agent and the lime powder under the test condition of 1 month flue gas desulfurization comparison in the ceramic factory are shown in the following table 7:
TABLE 7
From Table 7 above, it can be concluded that 5.1 sludge is reduced in the amount of liquid caustic, which is used as an alkaline agent to adjust the pH of the water and to reduce the water for spraying and absorbing sulfur dioxide. The method has the advantages that the reaction speed of the drug properties is high, the condition of the same efficiency as a desulfurizer can be achieved, the water quality and hydroxyl are kept reduced by calcium ions, the water hardness and calcium salt are weakened, no limestone gypsum impurity is introduced, a small amount of descaling agent of a desulfurizing tower is matched, the method is applied to a double-alkali desulfurization process, crystallization and scaling are not easy, no corrosion, aging and other factors influence on equipment is caused, and virtuous cycle operation work is achieved.
5.2. The existing kiln desulfurizing tower is added with about 40 tons of desulfurizing agent and 50 tons of lime powder to adjust the PH value for desulfurization, the spraying PH value is about 7.5, the PH value after water is sprayed is about 5.5-6, and only one of sludge decrement liquid caustic soda can be used for replacing the existing kiln desulfurizing tower completely.
According to the raw material water treatment requirement: firstly, according to the current raw sludge recycling principle, the recycling proportion is influenced by the content of calcium ions to expand and crack the brick body, and the pH value is adjusted by lime to cause high calcium ions. Secondly, the raw materials contain chemical material components, ceramic raw materials and other complex components, the concentration of other salts such as calcium ions in water can be increased when lime is used for treating sewage, and the subsequent use effect and cost can be increased, such as the cost and problems of glue dissolving, water reducing agent, ball milling time effect and the like.
The raw material sewage is treated by using the sludge decrement liquid caustic soda, the calcium ions per se are about 30 percent lower than lime on the medicament components, the solubility of the calcium ions is high, the recycling proportion of the sludge with excessive calcium ions is greatly improved, and the recycling effect and the cost of subsequent use, such as the cost and the problems of dispergation, a water reducing agent, the ball milling time effect and the like, of the treated sewage are reduced. And the amount of sludge after treatment can be reduced.
5.3. The method has the same advantages as kiln tower desulfurization in respect of reuse water of a spray tower raw material workshop, barrel blockage is reduced, desulfurization absorption rate is increased, and the like.
From the above data, the sludge reduction liquid caustic soda of the present invention is compared with the commercial caustic soda flakes, lime and lime products, liquid caustic soda (liquid sodium hydroxide)
1. Comparing sludge decrement liquid caustic soda with flake caustic soda:
the caustic soda flakes belong to dangerous goods, have strong corrosivity, can emit a large amount of heat when dissolved, and can cause liquid boiling and splashing when being improperly operated. And the caustic soda flakes only have the capability of adjusting pH and do not have the capability of flocculation, and coagulants such as polyaluminium chloride and the like are added after the pH of the wastewater is adjusted, so that the wastewater treatment cost of enterprises is increased.
Compared with caustic soda flakes, the sludge reduction liquid caustic soda is positioned as a common chemical agent, does not belong to dangerous goods, does not release heat when being dissolved, achieves the speed of using the caustic soda flakes after being dissolved, can ensure the same concentration of dissolved chemicals each time through automatic dissolution and dosing of liquid, ensures the capability of quickly adjusting pH, simultaneously has the coagulation capability, reduces or even does not need to subsequently add polyaluminium chloride, and the sludge reduction liquid caustic soda flakes mainly contain calcium, can well settle phosphoric acid, sulfuric acid and fluorine, achieves the effects of removing phosphorus, sulfur and fluorine, and reduces biochemical pressure.
2. Comparison with lime and lime products:
lime and lime products are mostly in powder form, dust is easily polluted when the lime and lime products are stored in a packaging bag, fine lime powder enters the lung through a respiratory tract, great damage is caused to the lung, medicine adding equipment is damaged, and the whole environment becomes white; the tank type is stored, whether the tank is filled or not is difficult to know in a tank car or a storage tank, and the lime is transported because lime powder is easy to pollute dust during transportation, and the dust is easy to cause dust explosion when exceeding a certain explosion limit, so that the storage tank is deformed easily, and the explosion accident directly occurs heavily. The production technology of lime is mostly limestone calcination method production, lime production process is because the limestone is the solid, it is complete to guarantee to calcine at the calcination process, it is complicated various to cause the lime composition of producing, be difficult to guarantee the content of active ingredient, can introduce the pollution in waste water treatment process, cause the mud increment, cause the handling cost of enterprise to rise, lime needs a large amount of time when dissolving in addition, easy scale deposit stifled pipe in the time of through pipeline transport in addition.
The sludge reduction liquid caustic soda is in a liquid state, has high dissolving speed, is used after being dissolved, does not cause environmental pollution, does not cause pipe blockage and dust pollution, has stable production process, stable components, does not cause secondary pollution, has rapid reaction process and high utilization rate, ensures the optimal sludge production amount, and can achieve the effect of reducing sludge compared with lime.
3. Comparison with liquid caustic soda (liquid sodium hydroxide)
The concentration of liquid sodium hydroxide is usually 30 to 50%, the main component is sodium hydroxide, and the concentration of liquid sodium hydroxide is reduced by dissolving the chemical when in use, but the liquid sodium hydroxide is easy to absorb carbon dioxide in air, the effective component is reduced, the liquid sodium hydroxide is also a dangerous product, has strong corrosivity, has high corrosion resistance to a medicament storage tank and a pipeline, only has the capability of adjusting pH, and needs to be added with a coagulant such as polyaluminium chloride during subsequent treatment to ensure sludge-water separation.
The sludge reduction liquid caustic soda has no corrosivity, does not belong to dangerous goods, a storage tank and a pipeline can meet the working requirement by using a common PE material, the coagulation capacity is realized while the pH capacity is ensured, the coagulant such as polyaluminium chloride is reduced or even not added subsequently, the product is mainly based on calcium, the phosphoric acid, the sulfuric acid and the fluorine can be well settled, the effects of removing phosphorus, sulfur and fluorine are achieved, and the biochemical pressure is reduced.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The sludge decrement liquid caustic soda is characterized by comprising a liquid caustic soda base material and water, wherein the liquid caustic soda base material comprises the following components in percentage by weight: 16-18% of calcium-based coagulant, 8-10% of nano-grade dispersing suspension agent and 5-7% of carbonic acid scavenger;
the weight ratio of the liquid alkali base material to the water is 3: 7.
2. The sludge-reducing liquid caustic soda as claimed in claim 1, wherein the liquid caustic soda base comprises the following components in percentage by weight: 17% of calcium-based coagulant, 9% of nano-scale dispersion suspending agent and 6% of carbonic acid scavenger.
3. The sludge reduction caustic soda lye of claim 2 wherein the calcium based coagulant provides pH adjusted hydroxide and wherein the calcium based coagulant provides stable sludge flocs.
4. The sludge-reducing liquid caustic soda of claim 2, wherein the nano-scale dispersing suspending agent is polyacrylamide.
5. The sludge reduction liquid caustic according to claim 2 wherein the carbonic acid scavenger is sodium acetate.
6. A process for producing sludge-reduced liquid caustic soda as claimed in any one of claims 1 to 5, comprising the steps of:
s1, high-temperature high-pressure stirring: adding 1 part by weight of lime powder and then injecting 9 parts by weight of water into a high-temperature and high-pressure stirrer for mixing and stirring, wherein the stirring speed is 100-140 revolutions per minute, the pressure value is 1.6-18 MPa, the temperature is 285-315 ℃, and the calcium-based coagulant is digested for 3 hours to prepare a semi-finished calcium-based coagulant solution, and the reaction formula is as follows:
CaO+H2O→Ca(OH)2
s2, impurity removal: reducing the temperature to 70-80 ℃, regulating the air pressure value to be atmospheric pressure value, sieving the half-finished calcium-based coagulant with a 1000-mesh sieve, and removing stones and insoluble impurities to prepare a standby calcium-based coagulant solution;
s3, sampling, regulating and detecting, namely sampling and detecting the standby liquid of the calcium-based coagulant, and regulating and controlling the calcium content to be 16-18% and the alkalinity to be 32-36% in the standby liquid of the calcium-based coagulant to prepare the calcium-based coagulant;
s4, adding medicine and cooling: adding 8-10% of dispersing suspending agent and 5-7% of carbonic acid scavenger into the calcium-based coagulant, stirring at 180 revolutions per minute until the temperature is reduced to room temperature, and preparing a sludge reduction liquid caustic soda semi-finished product;
s5, sieving: the sludge decrement liquid caustic soda semi-finished product is screened by a 300-mesh screen to remove larger particles or blocky paste, and the sludge decrement liquid caustic soda is prepared;
s6, storing a finished product: and (4) filling the sludge decrement liquid caustic soda into a medicine storage tank for use.
7. The sludge reduction liquid caustic soda as claimed in claim 6, wherein the calcium content and alkalinity of the solution for use of the calcium-based coagulant are 1: 2, the modes of regulating and controlling the calcium content in the standby liquid of the calcium-based coagulant are divided into two modes:
A. sampling to detect that the content of calcium in the standby liquid of the calcium-based coagulant is lower than 16-18%, and increasing the content of calcium in the standby liquid of the calcium-based coagulant by heating and evaporating water to prepare the calcium-based coagulant with the calcium content stabilized at 16-18%;
B. sampling to detect that the content of calcium in the standby liquid of the calcium-based coagulant is higher than 16-18%, and reducing the content of calcium in the standby liquid of the calcium-based coagulant by injecting water to prepare the calcium-based coagulant with the calcium content stabilized at 16-18%.
8. The sludge-reduced liquid caustic soda as claimed in claim 6, wherein the sludge-reduced liquid caustic soda has an acid-insoluble content of 0.3% or less, a calcium content of 16-18% in a calcium-based coagulant, an alkalinity of 25% + 1%, a pH value of 11 or more, and a relative molecular mass of 38.05.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111660069.3A CN114349302A (en) | 2021-12-30 | 2021-12-30 | Sludge decrement liquid caustic soda and manufacturing process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116813057A (en) * | 2023-05-29 | 2023-09-29 | 深圳市三理智光科技有限公司 | Liquid alkali for treating acidic sewage, preparation method and application thereof |
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| CN102211828A (en) * | 2011-04-29 | 2011-10-12 | 上海美伽水处理技术有限公司 | Method for sludge reduction for cold rolling pickling wastewater in steel industry |
| CN107352632A (en) * | 2017-09-05 | 2017-11-17 | 杭州瑞青环保科技有限公司 | A kind of compound alkali of activity and its preparation method and application |
| CN108314167A (en) * | 2018-04-08 | 2018-07-24 | 南宁市夏阳化工科技有限责任公司 | One kind is except compound alkali of spent acid and preparation method thereof |
| CN110255857A (en) * | 2019-05-28 | 2019-09-20 | 路德环境科技股份有限公司 | Low alkali conditioner and dewatering for construction slurry deep dehydration |
| CN113582320A (en) * | 2021-06-05 | 2021-11-02 | 深圳市长隆科技有限公司 | Preparation and application of alkaline calcium-based product with anti-settling property |
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| CN102211828A (en) * | 2011-04-29 | 2011-10-12 | 上海美伽水处理技术有限公司 | Method for sludge reduction for cold rolling pickling wastewater in steel industry |
| CN107352632A (en) * | 2017-09-05 | 2017-11-17 | 杭州瑞青环保科技有限公司 | A kind of compound alkali of activity and its preparation method and application |
| CN108314167A (en) * | 2018-04-08 | 2018-07-24 | 南宁市夏阳化工科技有限责任公司 | One kind is except compound alkali of spent acid and preparation method thereof |
| CN110255857A (en) * | 2019-05-28 | 2019-09-20 | 路德环境科技股份有限公司 | Low alkali conditioner and dewatering for construction slurry deep dehydration |
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| CN116813057A (en) * | 2023-05-29 | 2023-09-29 | 深圳市三理智光科技有限公司 | Liquid alkali for treating acidic sewage, preparation method and application thereof |
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