CN114196156A - Modified starch sludge recycling agent and preparation method thereof - Google Patents
Modified starch sludge recycling agent and preparation method thereof Download PDFInfo
- Publication number
- CN114196156A CN114196156A CN202111581877.0A CN202111581877A CN114196156A CN 114196156 A CN114196156 A CN 114196156A CN 202111581877 A CN202111581877 A CN 202111581877A CN 114196156 A CN114196156 A CN 114196156A
- Authority
- CN
- China
- Prior art keywords
- parts
- modified starch
- sludge
- recycling agent
- sludge recycling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/02—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to polysaccharides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a modified starch sludge recycling agent, which comprises: raw starch, acrylamide, dimethyl diallyl ammonium chloride, sodium dodecyl sulfate, ammonium persulfate, methyl methacrylate, styrene, diacetone acrylamide, butyl acrylate, dimethyl carbonate, polyvinyl alcohol and bisphenol A type epoxy resin; the preparation method comprises the following steps: (1) weighing the raw materials; (2) preparing an aqueous acrylamide solution; (3) preparing methyl methacrylate mixed solution; (4) adding ammonium persulfate into the raw starch, and heating and then gelatinizing; (5) after cooling for 5min, respectively dropwise adding a mixed solution of an acrylamide aqueous solution and methyl methacrylate, and keeping the temperature; (6) cooling again, adding polyvinyl alcohol and bisphenol A type epoxy resin, mixing and stirring uniformly to obtain the product. The modified starch sludge recycling agent can reduce the sludge pollution problem in papermaking wastewater and solve the problem of paper strength index reduction caused by sludge recycling.
Description
Technical Field
The invention relates to the technical field of recycling of papermaking sludge, in particular to a modified starch sludge recycling agent and a preparation method thereof.
Background
In the papermaking production process, along with the flowing of sewage circulating water, a large amount of fine fibers, calcium carbonate, talcum powder, starch, sizing agents and the like are lost along with water, lost substances are polluted by anaerobic bacteria in a water body for a long time to become sludge, solid waste is formed, a large amount of raw materials are wasted, and the formed solid waste also seriously pollutes the environment.
Most of the existing treatment schemes of the paper sludge are incineration power generation and dry sludge pressing landfill. Wherein, burning power generation can generate a large amount of smoke, which causes new pollution; and the pressed dry mud is wasted in raw materials and pollutes underground water and atmosphere, and cannot eliminate pollution essentially.
Recently, some medicaments for recycling sludge are available, the components of which are mostly polyacrylamide, and the main principle is to flocculate fine fibers and fillers in papermaking wastewater and then retain the fibers so as to achieve the purpose of recycling sludge. However, the fine fibers, fillers and the like on the paper become excessive, and the indexes of the paper such as surface strength, ring crush strength and folding endurance are lowered in a cliff-like manner.
Therefore, how to develop a medicament which can recycle the raw materials lost in the paper sludge and solve the problem of the decrease of the paper-making index is a problem that needs to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention aims to provide a modified starch sludge recycling agent and a preparation method thereof, so as to solve the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the modified starch sludge recycling agent comprises the following raw materials in parts by weight: 50 parts of raw starch, 5 parts of acrylamide, 3 parts of dimethyl diallyl ammonium chloride, 0.5 part of lauryl sodium sulfate, 2.5 parts of ammonium persulfate, 5 parts of methyl methacrylate, 2 parts of styrene, 0.3 part of diacetone acrylamide, 6 parts of butyl acrylate, 2.5 parts of dimethyl carbonate, 8 parts of polyvinyl alcohol and 2 parts of bisphenol A epoxy resin.
Further, the native starch is at least one of corn native starch, tapioca native starch, wheat starch and potato starch.
In the invention:
the modified starch is of a net structure, so that the contact probability of polymerization and sludge and the wrapping capacity of the polymerization and the sludge can be increased; dimethyl diallyl ammonium chloride and dimethyl carbonate (DMC) are cationic monomers, so that the binding capacity of polymerization and sludge can be increased; monomers such as methyl methacrylate can increase the surface strength of paper; polyvinyl alcohol and bisphenol A epoxy resin can increase the binding capacity of paper fibers, increase the compactness among fibers, and increase the ring crush strength of paper.
A preparation method of a modified starch sludge recycling agent specifically comprises the following steps:
(1) weighing the raw materials according to the weight parts of the modified starch sludge recycling agent;
(2) dissolving 5 parts of acrylamide, 3 parts of dimethyl diallyl ammonium chloride, 0.5 part of sodium dodecyl sulfate and 2 parts of ammonium persulfate in water to obtain an acrylamide aqueous solution for later use;
(3) uniformly mixing 5 parts of methyl methacrylate, 2 parts of styrene, 0.3 part of diacetone acrylamide, 6 parts of butyl acrylate and 2.5 parts of dimethyl carbonate to obtain a methyl methacrylate mixed solution for later use;
(4) adding 0.5 part of ammonium persulfate into a reaction kettle filled with the raw starch, and heating and then gelatinizing to obtain modified starch;
(5) after the temperature of the reaction kettle is reduced for 5min, respectively dropwise adding a mixed solution of acrylamide aqueous solution and methyl methacrylate, and preserving heat after dropwise adding is finished;
(6) and cooling the reaction kettle again, adding 8 parts of polyvinyl alcohol and 2 parts of bisphenol A epoxy resin, and uniformly mixing and stirring to obtain the modified starch sludge recycling agent.
Further, in the step (4), the temperature is increased to 90 ℃; the gelatinization time is 0.5 h.
The further beneficial effect of adopting the method is that the starch can be swelled and split at high temperature to form uniform pasty solution by heating and pasting.
Further, in the step (5), the temperature is reduced to 82-85 ℃; the dripping time is 3-4 h; the heat preservation time is 1 h.
The further beneficial effects of the adoption of the method are that the cationic monomer is added after the temperature is reduced, so that the binding capacity of polymerization and sludge can be increased, and the surface strength of paper is increased.
Further, in the step (6), the temperature is again reduced to 35 to 45 ℃.
The paper has the further beneficial effects that the polyvinyl alcohol and the bisphenol A type epoxy resin are added after the temperature is reduced, so that the bonding capacity of paper fibers can be increased, the compactness among the fibers is increased, and the ring crush strength of the paper is increased.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the modified starch sludge recycling agent is applied to papermaking wastewater, and can recycle the contained fine fibers and fillers into papermaking so as to change pollutants into valuable papermaking raw materials; meanwhile, the production amount of sludge is reduced, so that the energy consumption and the cost of sludge treatment are saved, and the industrial production is facilitated.
2. The modified starch sludge recycling agent can reduce the sludge pollution problem in papermaking wastewater and solve the problem of paper strength index reduction caused by sludge recycling.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, 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
The modified starch sludge recycling agent comprises the following raw materials in parts by weight: 50kg of corn native starch, 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of lauryl sodium sulfate, 2.5kg of ammonium persulfate, 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate, 2.5kg of dimethyl carbonate, 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin;
the preparation method of the modified starch sludge recycling agent specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the modified starch sludge recycling agent;
(2) dissolving 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of sodium dodecyl sulfate and 2kg of ammonium persulfate in water to obtain an acrylamide aqueous solution for later use;
(3) uniformly mixing 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate and 2.5kg of dimethyl carbonate to obtain a methyl methacrylate mixed solution for later use;
(4) adding 0.5kg of ammonium persulfate into a reaction kettle containing 50kg of corn native starch, heating to 90 ℃, and gelatinizing for 0.5h to obtain modified starch;
(5) cooling the reaction kettle to 83 ℃, starting to respectively dropwise add the mixed solution of the acrylamide aqueous solution and the methyl methacrylate after 5min, and preserving heat for 1h after dropwise adding is completed for 4 h;
(6) and cooling the reaction kettle to 40 ℃ again, adding 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin, and mixing and stirring uniformly to obtain the modified starch sludge recycling agent.
Example 2
The modified starch sludge recycling agent comprises the following raw materials in parts by weight: 50kg of corn native starch, 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of lauryl sodium sulfate, 2.5kg of ammonium persulfate, 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate, 2.5kg of dimethyl carbonate, 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin;
the preparation method of the modified starch sludge recycling agent specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the modified starch sludge recycling agent;
(2) dissolving 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of sodium dodecyl sulfate and 2kg of ammonium persulfate in water to obtain an acrylamide aqueous solution for later use;
(3) uniformly mixing 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate and 2.5kg of dimethyl carbonate to obtain a methyl methacrylate mixed solution for later use;
(4) adding 0.5kg of ammonium persulfate into a reaction kettle containing 50kg of corn native starch, heating to 90 ℃, and gelatinizing for 0.5h to obtain modified starch;
(5) cooling the reaction kettle to 82 ℃, starting to respectively dropwise add the mixed solution of the acrylamide aqueous solution and the methyl methacrylate after 5min, and preserving heat for 1h after dropwise adding is completed for 3 h;
(6) and cooling the reaction kettle to 35 ℃ again, adding 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin, and mixing and stirring uniformly to obtain the modified starch sludge recycling agent.
Example 3
The modified starch sludge recycling agent comprises the following raw materials in parts by weight: 50kg of cassava native starch, 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of lauryl sodium sulfate, 2.5kg of ammonium persulfate, 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate, 2.5kg of dimethyl carbonate, 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin;
the preparation method of the modified starch sludge recycling agent specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the modified starch sludge recycling agent;
(2) dissolving 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of sodium dodecyl sulfate and 2kg of ammonium persulfate in water to obtain an acrylamide aqueous solution for later use;
(3) uniformly mixing 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate and 2.5kg of dimethyl carbonate to obtain a methyl methacrylate mixed solution for later use;
(4) adding 0.5kg of ammonium persulfate into a reaction kettle containing 50kg of cassava raw starch, heating to 90 ℃, and gelatinizing for 0.5h to obtain modified starch;
(5) cooling the reaction kettle to 82 ℃, starting to respectively dropwise add the mixed solution of the acrylamide aqueous solution and the methyl methacrylate after 5min, and preserving heat for 1h after dropwise adding is completed for 3 h;
(6) and cooling the reaction kettle to 45 ℃ again, adding 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin, and mixing and stirring uniformly to obtain the modified starch sludge recycling agent.
Example 4
The modified starch sludge recycling agent comprises the following raw materials in parts by weight: 50kg of cassava native starch, 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of lauryl sodium sulfate, 2.5kg of ammonium persulfate, 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate, 2.5kg of dimethyl carbonate, 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin;
the preparation method of the modified starch sludge recycling agent specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the modified starch sludge recycling agent;
(2) dissolving 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of sodium dodecyl sulfate and 2kg of ammonium persulfate in water to obtain an acrylamide aqueous solution for later use;
(3) uniformly mixing 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate and 2.5kg of dimethyl carbonate to obtain a methyl methacrylate mixed solution for later use;
(4) adding 0.5kg of ammonium persulfate into a reaction kettle containing 50kg of cassava raw starch, heating to 90 ℃, and gelatinizing for 0.5h to obtain modified starch;
(5) cooling the reaction kettle to 83 ℃, starting to respectively dropwise add the mixed solution of the acrylamide aqueous solution and the methyl methacrylate after 5min, and preserving heat for 1h after dropwise adding is completed for 3 h;
(6) and cooling the reaction kettle to 36 ℃ again, adding 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin, and mixing and stirring uniformly to obtain the modified starch sludge recycling agent.
Example 5
The modified starch sludge recycling agent comprises the following raw materials in parts by weight: 50kg of wheat starch, 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of sodium dodecyl sulfate, 2.5kg of ammonium persulfate, 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate, 2.5kg of dimethyl carbonate, 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin;
the preparation method of the modified starch sludge recycling agent specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the modified starch sludge recycling agent;
(2) dissolving 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of sodium dodecyl sulfate and 2kg of ammonium persulfate in water to obtain an acrylamide aqueous solution for later use;
(3) uniformly mixing 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate and 2.5kg of dimethyl carbonate to obtain a methyl methacrylate mixed solution for later use;
(4) adding 0.5kg of ammonium persulfate into a reaction kettle containing 50kg of wheat starch, heating to 90 ℃, and gelatinizing for 0.5h to obtain modified starch;
(5) cooling the reaction kettle to 84 ℃, starting to respectively dropwise add the mixed solution of the acrylamide aqueous solution and the methyl methacrylate after 5min, and preserving heat for 1h after dropwise adding is completed for 4 h;
(6) and cooling the reaction kettle to 38 ℃ again, adding 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin, and mixing and stirring uniformly to obtain the modified starch sludge recycling agent.
Example 6
The modified starch sludge recycling agent comprises the following raw materials in parts by weight: 50kg of potato starch, 5kg of acrylamide, 3kg of dimethyldiallylammonium chloride, 0.5kg of sodium dodecyl sulfate, 2.5kg of ammonium persulfate, 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate, 2.5kg of dimethyl carbonate, 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin;
the preparation method of the modified starch sludge recycling agent specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the modified starch sludge recycling agent;
(2) dissolving 5kg of acrylamide, 3kg of dimethyl diallyl ammonium chloride, 0.5kg of sodium dodecyl sulfate and 2kg of ammonium persulfate in water to obtain an acrylamide aqueous solution for later use;
(3) uniformly mixing 5kg of methyl methacrylate, 2kg of styrene, 0.3kg of diacetone acrylamide, 6kg of butyl acrylate and 2.5kg of dimethyl carbonate to obtain a methyl methacrylate mixed solution for later use;
(4) adding 0.5kg of ammonium persulfate into a reaction kettle containing 50kg of potato starch, heating to 90 ℃, and gelatinizing for 0.5h to obtain modified starch;
(5) cooling the reaction kettle to 85 ℃, starting to respectively dropwise add the mixed solution of the acrylamide aqueous solution and the methyl methacrylate after 5min, and preserving heat for 1h after dropwise adding is completed for 4 h;
(6) and cooling the reaction kettle to 42 ℃ again, adding 8kg of polyvinyl alcohol and 2kg of bisphenol A epoxy resin, and mixing and stirring uniformly to obtain the modified starch sludge recycling agent.
Performance testing
First, sludge filling test
The test steps are as follows:
firstly, diluting the modified starch sludge recycling agent liquid prepared in the example 1 by a dilution multiple of 100 times;
secondly, detecting the concentration of the sludge, diluting the sludge to 4% by using clear water, and pretreating the sludge by using a certain amount of mixed modified starch sludge recycling agent;
thirdly, according to the waste paper pulp: and (3) preparing pulp according to the ratio of absolute dry sludge of 95:5 and 92:8, adjusting the concentration of the formed pulp to 1%, adding 400 g/ton paper CPAM (cationic polyacrylamide), slightly stirring uniformly, and then carrying out sheet making, wherein the sheet making quantity is 120 gsm.
The corrugated paper sludge contains self-made poplar pulp black liquor, which is not beneficial to recycling of the sludge, and the COD (chemical oxygen demand) of the poplar pulp black liquor is very high, so that the poplar pulp black liquor needs to enter the middle section water for anaerobic and aerobic biochemical treatment in the third stage, and cannot enter the middle section water for treatment in the first stage (the biochemical treatment section only has the aerobic property). And the subsequent amount of the cultural paper sludge can be greatly reduced after white water of the eight-cylinder paper machine is treated by adopting a plurality of discs. Therefore, the experiment inspects the recycling effect of the two types of sludge after pretreatment. The results are as follows.
1. Corrugated paper
The results of pretreatment of corrugated paper sludge with the modified starch sludge recycling agent are shown in table 1.
TABLE 1 corrugated paper sludge filling experiment results
As can be seen from Table 1, the flocculation of the pretreated sludge shows that the corrugated paper sludge is difficult to treat, so that the total dosage of the modified starch sludge recycling agent is increased to 80 kg/ton of absolutely dry sludge. Under the condition, the ring crush strength and the fracture length of the paper after the sludge with the content of 5 percent is equivalent to that of a blank sample without the sludge, and the ring crush strength of the paper is obviously reduced after the sludge addition is increased to 8 percent.
Meanwhile, the ash content of the two groups of paper added with the corrugated paper sludge is respectively improved by 2.96% and 4.42% compared with a blank sample, the sludge retention rate of the two groups of paper is calculated according to 55.7% of the ash content of the corrugated paper sludge, the sludge retention rate is very high, on one hand, the retention effect of the modified starch sludge recycling agent on the sludge is better, and on the other hand, the consumption of the modified starch sludge recycling agent is higher when the corrugated paper sludge is pretreated.
2. Cultural paper
The results of pretreatment of the cultural paper sludge by using the modified starch sludge recycling agent are shown in table 2.
Table 2 cultural paper sludge filling experimental results
As can be seen from Table 2, when the total amount of the modified starch sludge recycling agent is 20 kg/ton of oven-dried sludge, the paper ring crush strength and the fracture length after 5% of sludge is added are very close to those of the blank sample without sludge, and the paper ring crush strength and the fracture length are only slightly reduced compared with the blank sample even when the sludge addition amount is increased to 8%.
Meanwhile, the ash content of the two groups of paper added with the cultural paper sludge is respectively improved by 3.16% and 5.109% compared with a blank sample, the sludge retention rate of the two groups of paper is calculated to be about 91.6% and 85.2% according to 76.6% of the ash content of the cultural paper sludge, and the sludge retention rate is higher.
Second, economic benefits
1. Because the recycling doses of the modified starch sludge needed by the culture paper sludge and the corrugated paper sludge are different, the cost of the modified starch sludge recycling agent for recycling 1 ton of oven-dried sludge is calculated according to the condition that the using amount of the modified starch sludge recycling agent is 20 kg/ton of oven-dried sludge when the culture paper sludge is recycled and the using amount of the modified starch sludge recycling agent is 80 kg/ton of oven-dried sludge when the corrugated paper sludge is recycled. The results are shown in Table 3.
TABLE 3 cost of modified starch sludge recycling agent for recycling 1 ton of oven dried sludge
| Modified starch sludge recycling agent | Cultural paper sludge | Corrugated paper sludge |
| Dosage (kg/ton oven-dried sludge) | 20 | 80 |
| Monovalent (Yuan/kg) | 13.689 | 13.689 |
| Cost (Yuan/ton absolutely dry sludge) | 273.78 | 1095.12 |
As can be seen from Table 3, 1 ton of oven-dried sludge is recycled, the cost of the modified starch sludge recycling agent of the culture paper sludge is 273.78 yuan, and the cost of the modified starch sludge recycling agent of the corrugated paper sludge is 1095.12 yuan.
2. And calculating the motor power of the main equipment of the sludge recycling system for recycling 1 ton of absolutely dry sludge. The results are shown in Table 4.
TABLE 4 sludge recycle system main equipment motor power
As can be seen from table 4, the operating cost of the sludge recycling system is: the electricity consumption of the system is about 231kw per hour, the electricity charge is calculated according to 0.61 yuan/degree, and about 1.8 tons of absolutely dry sludge are conveyed per hour, namely the running electricity consumption cost is about 78.28 yuan/ton of absolutely dry sludge; the cost of the clear water and the steam for decocting the modified starch sludge recycling agent required by each ton of absolutely dry sludge is about 20 yuan. The operating cost of the total sludge system is about 98.28 yuan/ton of absolutely dry sludge.
3. And calculating the cost and benefit of recycling 1 ton of absolutely dry sludge. The results are shown in Table 5.
TABLE 5 cost and benefit of recycling 1 ton of oven dried sludge
From table 5, the overall benefits are: the comprehensive benefits of recycling 1 ton of absolutely dry sludge are as follows: benefit-cost 1807 + 2628 yuan; the addition amount of the sludge per ton of paper is 50kg of absolute dry sludge, and the integral comprehensive benefit of the corrugated paper company which converts 1 ton of the produced corrugated paper is about 90-131 yuan.
According to the fact that the addition amount of the paper sludge per ton is 50kg of the oven dry sludge, and the sludge retention rate is 80%, the comprehensive benefit of a company recycling 1 ton of the oven dry sludge is 1807-2628 yuan, or the overall comprehensive benefit of a company producing 1 ton of corrugated paper after the sludge recycling is implemented is about 90-131 yuan. The yield of the corrugated paper per year is 35 ten thousand tons, and the comprehensive benefit per year is about 3150 yuan and 4585 yuan.
Third, paper forming index detection
TABLE 6 sludge recycle test results (paper index using quality control department data)
The detection data of the ring crush strength of the corrugated base paper is greatly influenced by the moisture of the paper, so that the paper sample at the fixed part of the banner is taken and balanced for 14 hours at constant temperature and humidity while the detection data of the finished product quality inspection department is detected, and the index detection is carried out on the balanced paper sample to supplement the detection data of the finished product quality inspection department, wherein the specific data are shown in a table 7.
TABLE 7 sludge recycle pilot test paper index test results (test data of paper sample after balance)
From tables 6 and 7, it can be seen that the addition of sludge does not cause the reduction of the ring crush strength of the paper, the reduction of the paper breaking length but within a controllable range, and the concentration of the net white water and the single pass retention rate are not obviously changed compared with the case of not adding sludge, which shows that the effect of sludge recycling on the paper strength can be effectively reduced and the retention performance of the sludge can be improved by adopting the sludge recycling agent to pretreat the sludge.
On the other hand, the retention rate of the sludge is measured and calculated through the change of the ash content of the paper furnace, and from the ash content data in table 7, when 30kg of absolutely dry sludge is added to one ton of paper, the ash content of the paper forming sludge is improved by 1.39 percent compared with the ash content of the paper forming sludge without the sludge, the ash content of the cultural paper sludge is 68 percent, and the proportion of the sludge in the paper forming under the condition is 2.09 percent, namely the retention rate of the sludge is about 65 percent.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The modified starch sludge recycling agent is characterized by comprising the following raw materials in parts by weight: 50 parts of raw starch, 5 parts of acrylamide, 3 parts of dimethyl diallyl ammonium chloride, 0.5 part of lauryl sodium sulfate, 2.5 parts of ammonium persulfate, 5 parts of methyl methacrylate, 2 parts of styrene, 0.3 part of diacetone acrylamide, 6 parts of butyl acrylate, 2.5 parts of dimethyl carbonate, 8 parts of polyvinyl alcohol and 2 parts of bisphenol A epoxy resin.
2. The modified starch sludge recycling agent according to claim 1, wherein the native starch is at least one of corn native starch, tapioca native starch, wheat starch and potato starch.
3. The preparation method of the modified starch sludge recycling agent is characterized by comprising the following steps:
(1) weighing the raw materials according to the parts by weight of the modified starch sludge recycling agent in the claim 1 or 2;
(2) dissolving 5 parts of acrylamide, 3 parts of dimethyl diallyl ammonium chloride, 0.5 part of sodium dodecyl sulfate and 2 parts of ammonium persulfate in water to obtain an acrylamide aqueous solution for later use;
(3) uniformly mixing 5 parts of methyl methacrylate, 2 parts of styrene, 0.3 part of diacetone acrylamide, 6 parts of butyl acrylate and 2.5 parts of dimethyl carbonate to obtain a methyl methacrylate mixed solution for later use;
(4) adding 0.5 part of ammonium persulfate into a reaction kettle filled with the raw starch, and heating and then gelatinizing to obtain modified starch;
(5) after the temperature of the reaction kettle is reduced for 5min, respectively dropwise adding a mixed solution of acrylamide aqueous solution and methyl methacrylate, and preserving heat after dropwise adding is finished;
(6) and cooling the reaction kettle again, adding 8 parts of polyvinyl alcohol and 2 parts of bisphenol A epoxy resin, and uniformly mixing and stirring to obtain the modified starch sludge recycling agent.
4. The method for preparing the modified starch sludge recycling agent according to claim 3, wherein in the step (4), the temperature is raised to 90 ℃.
5. The method for preparing the modified starch sludge recycling agent according to claim 3, wherein in the step (4), the gelatinization time is 0.5 h.
6. The method for preparing the modified starch sludge recycling agent according to claim 3, wherein in the step (5), the temperature is reduced to 82-85 ℃.
7. The method for preparing the modified starch sludge recycling agent according to claim 3, wherein in the step (5), the dripping time is 3-4 h.
8. The method for preparing the modified starch sludge recycling agent according to claim 3, wherein in the step (5), the heat preservation time is 1 h.
9. The method for preparing the modified starch sludge recycling agent according to claim 3, wherein in the step (6), the temperature is reduced to 35-45 ℃ again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111581877.0A CN114196156A (en) | 2021-12-22 | 2021-12-22 | Modified starch sludge recycling agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111581877.0A CN114196156A (en) | 2021-12-22 | 2021-12-22 | Modified starch sludge recycling agent and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114196156A true CN114196156A (en) | 2022-03-18 |
Family
ID=80655967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111581877.0A Pending CN114196156A (en) | 2021-12-22 | 2021-12-22 | Modified starch sludge recycling agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114196156A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101550220A (en) * | 2009-01-08 | 2009-10-07 | 中国矿业大学(北京) | Cationic degree adjustable dual-function type fine particle used starch flocculant prepared with on-step method and synthesizing method thereof |
| CN102432143A (en) * | 2011-09-08 | 2012-05-02 | 赵光勇 | Chemical agent for treating and recycling paper sludge and treating method thereof |
| CN107445420A (en) * | 2017-07-24 | 2017-12-08 | 佛山金盛联合纸业有限公司 | A kind of reuse method of paper mill sludge |
| CN110002702A (en) * | 2019-04-18 | 2019-07-12 | 青岛祥泽高新材料有限公司 | A kind of preparation method of paper mill sludge recovery agent |
-
2021
- 2021-12-22 CN CN202111581877.0A patent/CN114196156A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101550220A (en) * | 2009-01-08 | 2009-10-07 | 中国矿业大学(北京) | Cationic degree adjustable dual-function type fine particle used starch flocculant prepared with on-step method and synthesizing method thereof |
| CN102432143A (en) * | 2011-09-08 | 2012-05-02 | 赵光勇 | Chemical agent for treating and recycling paper sludge and treating method thereof |
| CN107445420A (en) * | 2017-07-24 | 2017-12-08 | 佛山金盛联合纸业有限公司 | A kind of reuse method of paper mill sludge |
| CN110002702A (en) * | 2019-04-18 | 2019-07-12 | 青岛祥泽高新材料有限公司 | A kind of preparation method of paper mill sludge recovery agent |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103015263B (en) | Dry intensifier for paper making, and preparation method and application thereof | |
| CN102635019A (en) | Preparation method of organic silicon surface sizing agent | |
| CN104674595A (en) | Corrugated medium produced from waste paper papermaking sludge as well as production method of corrugated medium | |
| CN108166309B (en) | Agent for recovering secondary sludge of papermaking wastewater and preparation method of corrugated raw paper | |
| CN107881842B (en) | Method for preparing high-strength corrugated base paper by using straws and waste paper pulp | |
| Liu et al. | Treatment of APMP pulping effluent based on aerobic fermentation with Aspergillus niger and post-coagulation/flocculation | |
| CN102115998A (en) | Dry strengthening agent used for making papers and preparation method and application thereof | |
| CN104310559B (en) | A kind of method of utilizing modified straw dye wastewater treatment using | |
| CN108411674A (en) | A kind of biological enzyme slurrying special type softening agent and preparation method thereof | |
| CN105061774A (en) | Papermaking enhancer and preparation method thereof | |
| CN114196156A (en) | Modified starch sludge recycling agent and preparation method thereof | |
| CN104532663A (en) | Composite-fiber flame-retardant paper and preparation method thereof | |
| CN101935142A (en) | Dehydration method for waste paper paper-making sludge | |
| CN101709113A (en) | Preparation of macromolecular compatible additive, namely urea-formaldehyde modified lignin and application of macromolecular compatible additive | |
| CN111364284B (en) | Modified sizing starch, surface sizing liquid and preparation method and application thereof | |
| Jele et al. | Characterisation of pulp and paper mill sludge for beneficiation | |
| CN205313353U (en) | Papermaking mud utilization system | |
| CN110372812A (en) | A kind of natural rubber and preparation method thereof with high PO, PRI | |
| CN101654883B (en) | Biological processing method for preventing strength of regenerated plant fiber from being reduced | |
| CN108221425A (en) | A kind of method that regenerated newsprint is prepared using old newsprint | |
| CN110002702B (en) | Preparation method of papermaking sludge recycling agent | |
| CN105199048A (en) | APMP pulping waste water graft copolymerization crosslinking modification and application in corrugated paper surface sizing | |
| CN113087839A (en) | Preparation method of paper-plastic mold stiffness reinforcing agent | |
| CN105936602A (en) | Method for producing sponge fertilizer from pickling waste liquid and waste lignin | |
| CN104727185A (en) | Surface sizing agent prepared by composite modification of APMP pulping waste liquor and polyacrylamide for corrugated paper |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |