CN111689807A - Method for preparing chemi-mechanical pulp by using corn straw potash process and extracting pulping waste liquid to prepare fertilizer - Google Patents
Method for preparing chemi-mechanical pulp by using corn straw potash process and extracting pulping waste liquid to prepare fertilizer Download PDFInfo
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- CN111689807A CN111689807A CN202010453663.4A CN202010453663A CN111689807A CN 111689807 A CN111689807 A CN 111689807A CN 202010453663 A CN202010453663 A CN 202010453663A CN 111689807 A CN111689807 A CN 111689807A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a method for preparing chemi-mechanical pulp by a corn straw potash process and extracting pulping waste liquid to prepare fertilizer, and relates to the technical field of pulping and papermaking of agricultural solid wastes and resource utilization of the waste liquid in the pulping process. Pre-impregnating corn straws with a potassium hydroxide solution, and then grinding the corn straws into pulp to prepare corn straw chemi-mechanical pulp, wherein the pulp can be used for preparing qualified corrugated base paper without preparing other paper pulp; the organic fertilizer can be prepared by only concentrating or granulating the waste liquid generated in the pulping process without adding nutrients, and the organic-inorganic compound fertilizer can be prepared by adding related nutrients for concentrating and granulating. The invention provides a set of complete process for preparing chemi-mechanical pulp by pre-impregnating corn straws and grinding the corn straws into pulp and preparing fertilizer by using pulping waste liquid, the process is complete, the implementation process is simple, the potential of pulping and papermaking by using straw fiber raw materials is explored, the fertilizer prepared by using the waste liquid is used for agricultural production, the resource recycling and sharing of the pulping and papermaking industry and the agricultural production are reflected, and the sustainable development of the two industries is promoted.
Description
Technical Field
The invention relates to the technical field of pulping and papermaking of agricultural solid wastes and resource utilization of waste liquid in a pulping process, in particular to a method for preparing chemi-mechanical pulp by a corn straw potash process and extracting pulping waste liquid to prepare a fertilizer.
Background
The shortage of the fiber raw materials is a bottleneck for restricting the sustainable development of the Chinese paper industry, according to the data of 'Chinese paper industry sustainable development white paper book', the external dependence of the Chinese paper making fiber raw materials is as high as more than 50%, and the problem is more prominent because the import amount of the waste paper is greatly reduced after 2018 years. Therefore, it is very desirable to select a suitable papermaking fiber raw material to replace a part of the wood pulp and the waste pulp. The corn stalk as the side product of crop has the features of great yield and wide distribution, and is one excellent papermaking fiber material with fiber length slightly higher than that of rice straw and length-width ratio greater than 45. The predicament of shortage of fiber raw material can be improved by researching and utilizing the fiber raw material.
The chemical medicine commonly used for preparing the chemi-mechanical pulp is sodium alkali, the common treatment method of the chemi-mechanical pulp waste liquid by the sodium alkali method is an inlet water treatment system after concentration and alkali recovery or dilution, but one alkali recovery device generally needs to invest more than 3000 million RMB, the daily operation cost is very high, the system load is increased by the inlet water treatment system after dilution, the treatment cost is also high, and therefore a waste liquid treatment way needs to be considered from the source. The chemical properties of potash and soda are similar, potassium is a major element necessary for plant growth, and the pulping waste liquid can be prepared into various types of fertilizers, so that the treatment and utilization approaches of the chemi-mechanical pulping waste liquid are increased, and the profitability of enterprises is also increased.
Although the patent application No. 03122742.2 discloses a method for producing fertilizer by using alkaline pulping black liquor of potassium hydroxide, which is published by the national intellectual property office, the related raw materials are too wide and not specific enough, and the pulping process is not specified, so that the actual operation is difficult to implement. In addition, the patent is chemical pulping, compared with chemi-mechanical pulp, the yield of chemical pulp is low, the COD generation amount per ton pulp and the solid generation amount of waste liquid are high, so that a proper pulping method is selected according to the application of the prepared pulp, the yield of the pulp is improved as much as possible on the premise of ensuring the quality of the pulp, the generation amount of pollutants in the waste liquid is reduced, meanwhile, a method for treating the pulping waste liquid is provided, and a whole set of feasible method comprising pulping process conditions and a waste liquid treatment method is provided.
Disclosure of Invention
The invention aims to provide a method for preparing chemi-mechanical pulp by a corn straw potash process and extracting pulping waste liquid to prepare fertilizer. The straw chemi-mechanical pulp prepared by the method can be used for preparing qualified corrugated base paper without preparing other paper pulp, and waste liquid generated in the pulping process can be used for producing fertilizer without emission and secondary pollution. The method provides a set of complete processes for preparing chemi-mechanical pulp by pre-impregnating corn straws and grinding the corn straws into pulp and preparing the fertilizer by using the pulping waste liquid, explores the potential of pulping and papermaking by using straw fiber raw materials, realizes reasonable utilization of biomass resources, prepares the fertilizer by using the waste liquid for agricultural production, embodies resource recycling and sharing of the pulping and papermaking industry and the agricultural production to a certain extent, and promotes sustainable development of the two industries.
In order to realize the purpose, the invention provides a method for preparing chemi-mechanical pulp by pre-impregnating corn straw potassium alkali and extracting pulping waste liquid to prepare fertilizer.
The method for producing the fertilizer by pre-impregnating with potash, pulping to prepare corn straw chemi-mechanical pulp and extracting pulping waste liquid comprises the following steps:
(1) pre-impregnating corn straws with a potassium hydroxide solution, and then grinding the corn straws into slurry to obtain corn straw chemi-mechanical pulp;
(2) the waste liquor produced in the pulping process is used for preparing fertilizer.
Further, the pre-impregnation process parameters in the step (1) are 4-6% of the consumption of the pre-impregnated potassium hydroxide, the liquid ratio is 1: 4-1: 6, the highest temperature is 90-130 ℃, and the temperature is kept for 30 min.
Further, the process parameters of the pulp grinding in the step (1) are that the pulp grinding concentration is 15-25%, the pulp grinding gaps are 0.5mm, 0.3mm and 0.1mm, and the number of the pulp grinding sections is 3 or 4.
Further, a self-made squeezing and grinding machine with the compression ratio of 3.5: 1 is used for squeezing and defibering, pulping waste liquid is extracted, the concentration of solid matters in the extracted pulping waste liquid is 6.0-9.0%, the content of organic matters in the solid matters is 68.0-72.0%, the content of potassium elements is 11.0-15.0%, and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) are 15.5-18.5%.
Furthermore, nutrients do not need to be added into the waste liquid, and the organic fertilizer can be prepared only by concentration or granulation, wherein the organic matter content in solid matters in the organic fertilizer is 68.0-72.0%, and the total nutrients are 15.5-18.5%; adding 300-350 kg/t ammonium phosphate or 250-300 kg/t diammonium hydrogen phosphate or 300-400 kg/t mixture of ammonium bicarbonate and diammonium hydrogen phosphate (mass ratio is 1: 5) into the solid waste liquid, concentrating and granulating to obtain the organic-inorganic compound fertilizer, wherein the organic matter content of the compound fertilizer is higher than 50%, and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) are higher than 30%.
The invention has the following advantages:
1. the invention provides a set of complete process for preparing chemi-mechanical pulp by pre-impregnating corn straws and grinding the corn straws and preparing fertilizer by pulping waste liquid, the process is complete, the implementation process is simple, related medicines and facilities are few, the chemi-mechanical pulp and the pulping waste liquid are conventional products, and no secondary pollution is caused in the production process. The pulping waste liquid is changed into valuable, the sewage treatment cost is saved, the conventional alkali recovery is not needed, and the enterprise operation cost is reduced.
2. Various indexes of paper sheets obtained by sheet making of the corn straw chemi-mechanical pulp prepared by the invention all reach the specification of qualified corrugated medium (original) paper (BG/T13023-2008).
3. The content of organic matters and potassium in the solid matters of the pulping waste liquid is high, wherein potassium exists in the form of organic potassium, and when the waste liquid is applied to soil as a liquid fertilizer, the organic potassium can be slowly released to play a role of slowly releasing a potassium fertilizer; and the inorganic nutrients such as nitrogen, calcium, magnesium, sulfur, silicon and the like in the corn straws are reserved, and the corn straw fertilizer has great effect and profound significance for improving soil and ecological environment and sustainable development.
4. The waste liquid can be used for producing organic fertilizers and organic-inorganic compound fertilizers, different forms of fertilizers can be produced according to the actual conditions of enterprises, the liquid fertilizers can be directly sold in areas with a certain radius of the enterprises in the fertilization season, and the solid fertilizers can be stored for a long time and sold all over the country.
5. The invention needs to purchase a large amount of corn straws, can solve the problem of local labor employment, increases the income of farmers and has remarkable social benefit.
Drawings
The attached figure is a process flow schematic diagram of corn straw potassium-alkali pulping and fertilizer production by waste liquid.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but 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 corn stalk of the embodiment is taken from a certain Liaoning paper making enterprise, is not separated from the skin and stalk and is the whole corn stalk. The method for preparing the fertilizer by using the corn straw chemi-mechanical pulp and the pulping waste liquid comprises the following steps:
(1) the technological parameters of preimpregnation are that the dosage of preimpregnated potassium hydroxide is 5.6%, the liquid ratio is 1: 5, the highest temperature is 130 ℃, and the temperature is kept for 30 min. The technological parameters of the pulping are that the pulping concentration is 20 percent, the pulping clearance is 0.5mm, 0.3mm, 0.1mm and 0.1mm, 4 sections of pulping are screened to prepare the corn stalk chemi-mechanical pulp;
(2) extracting the pulping waste liquid by a spiral extrusion mill, concentrating and granulating to obtain the organic fertilizer, and adding 310kg ammonium phosphate into each ton of the solid matters of the waste liquid to obtain the organic-inorganic compound fertilizer meeting the national standard.
The experiment is carried out according to the parameters, and the quantitative of the corn straw chemical mechanical pulp making is 120 +/-5 g/m2Hand-made sheet, and the tightness of paper sheet is measured to be 0.49g cm by physical property detection-3Ring pressure index of 9.9 Nm.g-1The breaking length is 2.56km, and the tightness, ring crush index and breaking length of qualified corrugated core (original) paper (BG/T13023--3、3.5N·m·g-12.50 km. The pH value of the waste liquid is 6.6, the waste liquid is nearly neutral, the organic matter content of the organic fertilizer prepared by concentration and granulation is 69.9 percent, the total nutrient (nitrogen + phosphorus pentoxide + potassium oxide) is 15.9 percent, and the organic fertilizer meets the regulation of the standard of organic fertilizers (NY525-2012) on related indexes. The organic-inorganic compound fertilizer prepared from the waste liquid has the organic matter content of 53.3 percent and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) of30.0 percent, and meets the standard regulation of organic-inorganic compound fertilizer (GB 15063-2009).
Example 2:
the corn stalk of the embodiment is taken from a certain Liaoning paper making enterprise, is not separated from the skin and stalk and is the whole corn stalk. The method for preparing the fertilizer by using the corn straw chemi-mechanical pulp and the pulping waste liquid comprises the following steps:
(1) the technological parameters of preimpregnation are that the dosage of preimpregnated potassium hydroxide is 6.0%, the liquid ratio is 1: 4, the highest temperature is 130 ℃, and the temperature is kept for 30 min. The technological parameters of the pulping are that the concentration of the pulping pulp is 20 percent, the pulping clearance is 0.5mm, 0.3mm and 0.1mm, 3 sections of pulping are screened to prepare the corn stalk chemi-mechanical pulp;
(2) extracting pulping waste liquid by a spiral extruding and grinding machine, concentrating the pulping waste liquid to the solid content of 35 percent to obtain the organic liquid fertilizer, and adding 50kg of ammonium bicarbonate and 300kg of diammonium hydrogen phosphate into each ton of the solid content of the waste liquid to obtain the organic-inorganic compound fertilizer meeting the national standard.
The experiment is carried out according to the parameters, and the quantitative of the corn straw chemical mechanical pulp making is 120 +/-5 g/m2Hand-made sheet, and the tightness of paper sheet is measured to be 0.48g cm by physical property detection-3Ring pressure index of 10.3 Nm.g-1The breaking length is 2.53km, which meets the specification of qualified corrugated medium (original) paper (BG/T13023-2008) products on various indexes. The pH value of the waste liquid is 6.9, the waste liquid is neutral, the organic matter content of the organic liquid fertilizer prepared by concentration is 270g/L, the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) are 67g/L, and the regulation of local standards in Zhejiang province on relevant indexes of the organic liquid fertilizer is met. The organic-inorganic compound fertilizer prepared from the waste liquid has the organic matter content of 51.3 percent and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) of 30.6 percent, and meets the standard regulation of the organic-inorganic compound fertilizer (GB 15063-2009).
Example 3:
the corn stalk of the embodiment is taken from a certain farm in Beijing, is not separated from the skin stalk and is the whole corn stalk. The method for preparing the fertilizer by using the corn straw chemi-mechanical pulp and the pulping waste liquid comprises the following steps:
(1) the technological parameters of preimpregnation are that the dosage of preimpregnated potassium hydroxide is 6.0%, the liquid ratio is 1: 5, the highest temperature is 110 ℃, and the temperature is kept for 30 min. The technological parameters of the pulping are that the concentration of the pulping pulp is 25 percent, the pulping clearance is 0.5mm, 0.3mm and 0.1mm, 3 sections of pulping are screened to prepare the corn stalk chemi-mechanical pulp;
(2) extracting the pulping waste liquid by a spiral extruding and grinding machine, concentrating and granulating to obtain the organic fertilizer, and adding 260kg of diammonium hydrogen phosphate into each ton of solid matters of the waste liquid to obtain the organic-inorganic compound fertilizer meeting the national standard.
The experiment is carried out according to the parameters, and the quantitative of the corn straw chemical mechanical pulp making is 120 +/-5 g/m2Hand-made sheet, and the tightness of paper sheet is measured to be 0.48g cm by physical property detection-3Ring pressure index of 9.6 Nm.g-1The breaking length is 2.52km, which meets the specification of qualified corrugated medium (original) paper (BG/T13023-. The pH value of the waste liquid is 7.8, the waste liquid is nearly neutral, the organic matter content of the organic fertilizer prepared by concentration is 69.7%, the total nutrient (nitrogen + phosphorus pentoxide + potassium oxide) is 18.0%, and the organic fertilizer meets the regulation of the standard of organic fertilizers (NY525-2012) on related indexes. The organic-inorganic compound fertilizer prepared from the waste liquid has the organic matter content of 55.3 percent and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) of 30.2 percent, and meets the standard regulation of the organic-inorganic compound fertilizer (GB 15063-one 2009).
Claims (5)
1. The method for preparing chemi-mechanical pulp by using the corn straw potash process and extracting pulping waste liquid to prepare fertilizer is characterized by comprising the following steps of:
(1) pre-impregnating corn straws with a potassium hydroxide solution, and then grinding the corn straws into slurry to obtain corn straw chemi-mechanical pulp;
(2) the waste liquor produced in the pulping process is used for preparing fertilizer.
2. The potash corn stalk chemi-mechanical pulp as claimed in claim 1, wherein the pre-impregnation process parameters in step (1) are 4-6% of pre-impregnated potassium hydroxide dosage, liquid ratio is 1: 4-1: 6, maximum temperature is 90-130 ℃, and heat preservation is carried out for 30 min.
3. The potash corn stalk chemi-mechanical pulp according to claim 1, wherein the refining parameters in the step (1) are that the refining pulp concentration is 15-25%, the refining gap is 0.5mm, 0.3mm, 0.1mm, and the number of refining segments is 3 or 4.
4. The method for producing the fertilizer by extracting the pulping waste liquid according to claim 1, wherein a self-made squeezing and grinding machine with a compression ratio of 3.5: 1 is used for squeezing and defibering to extract the pulping waste liquid, the solid concentration of the extracted pulping waste liquid is 6.0-9.0%, the organic matter content in the solid is 68.0-72.0%, the potassium element content is 11.0-15.0%, and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) are 15.5-18.5%.
5. The method for producing the fertilizer by extracting the pulping waste liquid according to claim 1 and the physicochemical properties of the pulping waste liquid according to claim 4 are characterized in that in the step (2), nutrients are not required to be added into the waste liquid, and the organic fertilizer can be prepared only by concentration or granulation, wherein the organic matter content in solids in the organic fertilizer is 68.0-72.0%, and the total nutrients are 15.5-18.5%; adding 300-350 kg/t ammonium phosphate or 250-300 kg/t diammonium hydrogen phosphate or 300-400 kg/t mixture of ammonium bicarbonate and diammonium hydrogen phosphate (mass ratio is 1: 5) into the solid waste liquid, concentrating and granulating to obtain the organic-inorganic compound fertilizer, wherein the organic matter content of the compound fertilizer is higher than 50%, and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) are higher than 30%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853793A (en) * | 2020-12-31 | 2021-05-28 | 齐鲁工业大学 | Method for preparing primary-color biomechanical pulp by treating wheat straws with hot steam and biological enzyme and fully utilizing byproducts |
| CN115584655A (en) * | 2022-11-03 | 2023-01-10 | 齐鲁工业大学 | Method for preparing byproduct biological fertilizer by using wheat straw for pulping and product thereof |
| CN116732800A (en) * | 2023-05-08 | 2023-09-12 | 上海昶法新材料有限公司 | Preparation method and application of straw pulping machine pulp and pulping waste liquid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853793A (en) * | 2020-12-31 | 2021-05-28 | 齐鲁工业大学 | Method for preparing primary-color biomechanical pulp by treating wheat straws with hot steam and biological enzyme and fully utilizing byproducts |
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| CN116732800A (en) * | 2023-05-08 | 2023-09-12 | 上海昶法新材料有限公司 | Preparation method and application of straw pulping machine pulp and pulping waste liquid |
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