CN109096009A - A kind of agent of soil acid-base well-balanced adjustment and preparation process based on desulfurized gesso of flue gas - Google Patents
A kind of agent of soil acid-base well-balanced adjustment and preparation process based on desulfurized gesso of flue gas Download PDFInfo
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- CN109096009A CN109096009A CN201811010427.4A CN201811010427A CN109096009A CN 109096009 A CN109096009 A CN 109096009A CN 201811010427 A CN201811010427 A CN 201811010427A CN 109096009 A CN109096009 A CN 109096009A
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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
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
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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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- Pest Control & Pesticides (AREA)
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas that the invention discloses a kind of, the raw material including following parts by weight: 30~45 parts of calcium silicate fertilizer, 30~40 parts of vulcanized sodium essence slag, 20~28 parts of dimethylformamide, 16~24 parts of citrate, 8~12 parts of fertilizer additive, 8~12 parts of diatomite, 2~6 parts of phosphate fertilizer, 1~3 part of benzoyl peroxide, surplus are deionized water；Preparation method includes the following steps: S1: the vulcanized sodium essence slag and diatomite of the above parts by weight are added sequentially to be sufficiently mixed in blender, a certain amount of deionized water will be added after mixing in mixture to grind, and the calcium silicate fertilizer of the above parts by weight is added, mixing obtains mixed liquor A.The effect of the present invention has rational design, and preparation cost is low, turns waste into wealth, and can play improvement soil, stabilizing heavy metal realizes the purpose for significantly improving crop yield, is suitable for promoting.
Description
Technical field
The present invention relates to alkaline land improving technical field more particularly to a kind of soil acid-base based on desulfurized gesso of flue gas are equal
Weigh regulator and preparation process.
Background technique
China is inchoate from the later period in age 20th century 9O using coal-fired flue gas desulfurization gypsum improvement alkali-affected soil.1995
Year Tsinghua University and other unit cooperation take the lead in saline and alkaline to the not long crops of the big large area in China using desulfurized gypsum in the world
Ground soil carries out improvement in the coal-fired flue gas desulfurization gypsum scale of the ground such as Yinchuan of Ningxia Province, Jilin Baicheng, continuity improvement alkalization
Soil, significant effect can significantly reduce the pH value, basicity and soluble sodium ion of soil, improve the yield of crop.
With vehicle exhaust, the discharge of commercial silica sulphur causes atmosphere pollution, and the acid rain of formation leads to soil hardening,
It is acid larger, it is difficult to be suitble to plant growth, or even make Plant death.And influence of the soil acidity or alkalinity to nutrient availability, mainly
Show the following: 1, in the normal range, the plant reason sensitive to soil ph is since soil pH value influences soil
The concentration of various ions in earth solution influences various elements to the validity of plant；2, soil ph is effective to nutrient
The influence of property:
(1) nitrogen validity in pH 6-8 is higher, is due to when pH value is less than 6, and nitrogen-fixing bacteria activity reduces, and is greater than 8
When, nitrification is suppressed；
(2) phosphorus validity in pH 6.5-7.5 is higher, due to easily forming ferric phosphate, phosphoric acid when pH value is less than 6.5
Aluminium, validity reduce, and pH value then easily forms calcium dihydrogen phosphate, inorganic phosphorus fixation when being higher than 7.5；
(3) eluviation of acid soil is strong, and potassium, calcium, magnesium are easy to be lost, these elements is caused to lack.It is higher than in pH
When 8.5, soil sodium ion increases, and calcium and magnesium ion is substituted and forms carbonate deposition, therefore the validity of calcium, magnesium is in pH 6-8
When it is best；
(4) validity is high due to solvable in acid soil for five kinds of iron, manganese, copper, zinc, cobalt microelements；Molybdate is insoluble
It is dissolved in alkali in acid, is easily lacked in acid soil；Borate validity in pH5-7.5 is preferable.
To improve acid soil, neutralization activity acid, latent property acid, improvement soil texture are generally reached using lime.Existing place
Reason salt-soda soil mode is directly digged using desulfurized gesso of flue gas to be carried out using but making due to individually going in order to handle salt-soda soil
With desulfurized gesso of flue gas gigantic project, and it is time-consuming and laborious, and also the salt-soda soil for generally requiring processing is as production estimation
It uses, and necessarily uses chemical fertilizer in farming, and chemical fertilizer is to be sprinkling upon in field, and guarantee field large area due to changing
Fertilizer, according to the generally degree that chemical fertilizer uses in field, therefore the present invention uses desulfurized gesso of flue gas and chemical fertilizer combining form, and matches
It closes organic fertilizer and carries out collective effect, to solve the problems, such as set forth above.
Summary of the invention
It is time-consuming and laborious based on the progress alkaline land improving of single pass desulfurized gesso of flue gas existing for background technique, and engineering
Technical problem great, at high cost, the soil acid-base well-balanced adjustment agent that the invention proposes a kind of based on desulfurized gesso of flue gas and
Preparation process.
A kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas proposed by the present invention, including following parts by weight
Raw material: 30~45 parts of calcium silicate fertilizer, 30~40 parts of vulcanized sodium essence slag, 20~28 parts of dimethylformamide, 16~24 parts of citrate,
8~12 parts of fertilizer additive, 8~12 parts of diatomite, 2~6 parts of phosphate fertilizer, 1~3 part of benzoyl peroxide, surplus are deionized water.
Preferably, the raw material including following parts by weight: 35~40 parts of calcium silicate fertilizer, 32~38 parts of vulcanized sodium essence slag, dimethyl
22~26 parts of formamide, 18~22 parts of citrate, 9~11 parts of fertilizer additive, 9~11 parts of diatomite, 3~5 parts of phosphate fertilizer, mistake
1.5~2.5 parts of Benzoyl Oxide, surplus are deionized water.
Preferably, the raw material including following parts by weight: 38 parts of calcium silicate fertilizer, 35 parts of vulcanized sodium essence slag, dimethylformamide 24
Part, 20 parts of citrate, 10 parts of fertilizer additive, 10 parts of diatomite, 4 parts of phosphate fertilizer, 2 parts of benzoyl peroxide, surplus be go from
Sub- water.
Preferably, the phosphate fertilizer is made of weight fraction ratio of the potassium dihydrogen phosphate and calcium superphosphate of 2:1.
Preferably, the fertilizer additive is diethyl aminoethyl hexanoate, and the mass ratio of fertilizer additive and diatomite is 1:1.
Preferably, the mass ratio of the potassium dihydrogen phosphate and benzoyl peroxide is 2:1.
The preparation process for the soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas that the invention also provides a kind of, system
Preparation Method the following steps are included:
S1: the vulcanized sodium essence slag and diatomite of the above parts by weight are added sequentially to be sufficiently mixed in blender, after mixing
A certain amount of deionized water will be added in mixture to grind, and the calcium silicate fertilizer of the above parts by weight is added, be mixed
Obtain mixed liquor A；
S2: it is added sequentially to mix to the dimethylformamide of the above parts by weight, citrate, phosphate fertilizer and benzoyl peroxide
It closes in liquid A, under the conditions of 40~50 DEG C, 1~2h is stirred with the speed of 120~150r/min, obtains mixed liquid B；
S3: when liquid B to be mixed is cooled to 28~35 DEG C, a certain amount of deionized water is added, with the speed of 60~90r/min
Stir 15~20min, add fertilizer additive, be warming up to 60~75 DEG C, with the speed of 120~150r/min stirring 20~
30min, cooling obtained mixed liquor C；
S4: ph value is measured to mixed liquor C pH test paper, the agent of soil acid-base well-balanced adjustment is made after cooling.
Preferably, in the S1, the speed that vulcanized sodium essence slag and diatomite are mixed is 220~250r/min, stirring
Temperature is 30~35 DEG C.
Preferably, the crushed material fineness after the vulcanized sodium essence slag and diatomite stir is 60~80 mesh.
Preferably, the weight ratio of the deionized water in the deionized water and S3 in the S1 is 1:3~5.
Compared with prior art, the beneficial effects of the present invention are:
1, by adding diatomite, carbide slag and vulcanized sodium waste residue in calcium silicate fertilizer, trade waste is made full use of to carry out
It is effectively treated, and acts synergistically with other components, can play improvement soil, the effect of stabilizing heavy metal, realize the weight of waste
It is new to utilize, there is splendid economic benefit and social benefit, reduce cost；
2, it is high boiling polar aprotic solvent using dimethylformamide, the progress of SN2 reaction mechanism can be promoted,
Soil appearance can be effectively reduced in manufactured regulator after dimethylformamide is mixed with benzoyl peroxide, citrate simultaneously
Weight increases soil porosity and water-holding capacity, and then significantly improves crop yield.
The effect of the present invention has rational design, and preparation cost is low, turns waste into wealth, and can play improvement soil, stabilizing heavy metal,
It realizes the purpose for significantly improving crop yield, is suitable for promoting.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Embodiment one
The present embodiment proposes a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas, including following parts by weight
Raw material: 30 parts of calcium silicate fertilizer, 30 parts of vulcanized sodium essence slag, 20 parts of dimethylformamide, 16 parts of citrate, 8 parts of fertilizer additive,
8 parts of diatomite, 2 parts of phosphate fertilizer, 1 part of benzoyl peroxide, surplus are deionized water；
Preparation method includes the following steps:
S1: the vulcanized sodium essence slag and diatomite of the above parts by weight are added sequentially to be sufficiently mixed in blender, after mixing
A certain amount of deionized water will be added in mixture to grind, and the calcium silicate fertilizer of the above parts by weight is added, be mixed
Mixed liquor A is obtained, the speed that wherein vulcanized sodium essence slag and diatomite are mixed is 220r/min, and whipping temp is 30 DEG C, and
Crushed material fineness after the vulcanized sodium essence slag and diatomite stirring is 60 mesh；
S2: it is added sequentially to mix to the dimethylformamide of the above parts by weight, citrate, phosphate fertilizer and benzoyl peroxide
It closes in liquid A, under the conditions of 40 DEG C, 1h is stirred with the speed of 120r/min, obtains mixed liquid B；
S3: when liquid B to be mixed is cooled to 28 DEG C, being added a certain amount of deionized water, is stirred with the speed of 60r/min
15min adds fertilizer additive, is warming up to 60 DEG C, stirs 20min, cooling obtained mixed liquor C with the speed of 120r/min,
Wherein the weight ratio of the deionized water in the deionized water and S3 in the S1 is 1:3；
S4: ph value is measured to mixed liquor C pH test paper, the agent of soil acid-base well-balanced adjustment is made after cooling.
Embodiment two
The present embodiment proposes a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas, including following parts by weight
Raw material: 34 parts of calcium silicate fertilizer, 33 parts of vulcanized sodium essence slag, 22 parts of dimethylformamide, 18 parts of citrate, 9 parts of fertilizer additive,
9 parts of diatomite, 3 parts of phosphate fertilizer, 1.5 parts of benzoyl peroxide, surplus are deionized water；
Preparation method includes the following steps:
S1: the vulcanized sodium essence slag and diatomite of the above parts by weight are added sequentially to be sufficiently mixed in blender, after mixing
A certain amount of deionized water will be added in mixture to grind, and the calcium silicate fertilizer of the above parts by weight is added, be mixed
Mixed liquor A is obtained, the speed that wherein vulcanized sodium essence slag and diatomite are mixed is 227r/min, and whipping temp is 32 DEG C, and
Crushed material fineness after the vulcanized sodium essence slag and diatomite stirring is 65 mesh；
S2: it is added sequentially to mix to the dimethylformamide of the above parts by weight, citrate, phosphate fertilizer and benzoyl peroxide
It closes in liquid A, under the conditions of 42 DEG C, 1.2h is stirred with the speed of 127r/min, obtains mixed liquid B；
S3: when liquid B to be mixed is cooled to 29 DEG C, being added a certain amount of deionized water, is stirred with the speed of 67r/min
16min adds fertilizer additive, is warming up to 64 DEG C, stirs 22min, cooling obtained mixed liquor C with the speed of 127r/min,
Wherein the weight ratio of the deionized water in the deionized water and S3 in the S1 is 1:3.5；
S4: ph value is measured to mixed liquor C pH test paper, the agent of soil acid-base well-balanced adjustment is made after cooling.
Embodiment three
The present embodiment proposes a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas, including following parts by weight
Raw material: 38 parts of calcium silicate fertilizer, 35 parts of vulcanized sodium essence slag, 24 parts of dimethylformamide, 20 parts of citrate, fertilizer additive 10
Part, 10 parts of diatomite, 4 parts of phosphate fertilizer, 2 parts of benzoyl peroxide, surplus are deionized water；
Preparation method includes the following steps:
S1: the vulcanized sodium essence slag and diatomite of the above parts by weight are added sequentially to be sufficiently mixed in blender, after mixing
A certain amount of deionized water will be added in mixture to grind, and the calcium silicate fertilizer of the above parts by weight is added, be mixed
Mixed liquor A is obtained, the speed that wherein vulcanized sodium essence slag and diatomite are mixed is 235r/min, and whipping temp is 33 DEG C, and
Crushed material fineness after the vulcanized sodium essence slag and diatomite stirring is 70 mesh；
S2: it is added sequentially to mix to the dimethylformamide of the above parts by weight, citrate, phosphate fertilizer and benzoyl peroxide
It closes in liquid A, under the conditions of 45 DEG C, 1.5h is stirred with the speed of 135r/min, obtains mixed liquid B；
S3: when liquid B to be mixed is cooled to 31 DEG C, being added a certain amount of deionized water, is stirred with the speed of 75r/min
18min adds fertilizer additive, is warming up to 68 DEG C, stirs 25min, cooling obtained mixed liquor C with the speed of 135r/min,
Wherein the weight ratio of the deionized water in the deionized water and S3 in the S1 is 1:4；
S4: ph value is measured to mixed liquor C pH test paper, the agent of soil acid-base well-balanced adjustment is made after cooling.
Example IV
The present embodiment proposes a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas, including following parts by weight
Raw material: 42 parts of calcium silicate fertilizer, 38 parts of vulcanized sodium essence slag, 26 parts of dimethylformamide, 22 parts of citrate, fertilizer additive 11
Part, 11 parts of diatomite, 5 parts of phosphate fertilizer, 2.5 parts of benzoyl peroxide, surplus are deionized water；
Preparation method includes the following steps:
S1: the vulcanized sodium essence slag and diatomite of the above parts by weight are added sequentially to be sufficiently mixed in blender, after mixing
A certain amount of deionized water will be added in mixture to grind, and the calcium silicate fertilizer of the above parts by weight is added, be mixed
Mixed liquor A is obtained, the speed that wherein vulcanized sodium essence slag and diatomite are mixed is 242r/min, and whipping temp is 34 DEG C, and
Crushed material fineness after the vulcanized sodium essence slag and diatomite stirring is 75 mesh；
S2: it is added sequentially to mix to the dimethylformamide of the above parts by weight, citrate, phosphate fertilizer and benzoyl peroxide
It closes in liquid A, under the conditions of 48 DEG C, 1.8h is stirred with the speed of 142r/min, obtains mixed liquid B；
S3: when liquid B to be mixed is cooled to 33 DEG C, being added a certain amount of deionized water, is stirred with the speed of 82r/min
19min adds fertilizer additive, is warming up to 72 DEG C, stirs 28min, cooling obtained mixed liquor C with the speed of 142r/min,
Wherein the weight ratio of the deionized water in the deionized water and S3 in the S1 is 1:4.5；
S4: ph value is measured to mixed liquor C pH test paper, the agent of soil acid-base well-balanced adjustment is made after cooling.
Embodiment five
The present embodiment proposes a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas, including following parts by weight
Raw material: 45 parts of calcium silicate fertilizer, 40 parts of vulcanized sodium essence slag, 28 parts of dimethylformamide, 24 parts of citrate, fertilizer additive 12
Part, 12 parts of diatomite, 6 parts of phosphate fertilizer, 3 parts of benzoyl peroxide, surplus are deionized water；
Preparation method includes the following steps:
S1: the vulcanized sodium essence slag and diatomite of the above parts by weight are added sequentially to be sufficiently mixed in blender, after mixing
A certain amount of deionized water will be added in mixture to grind, and the calcium silicate fertilizer of the above parts by weight is added, be mixed
Mixed liquor A is obtained, the speed that wherein vulcanized sodium essence slag and diatomite are mixed is 250r/min, and whipping temp is 35 DEG C, and
Crushed material fineness after the vulcanized sodium essence slag and diatomite stirring is 80 mesh；
S2: it is added sequentially to mix to the dimethylformamide of the above parts by weight, citrate, phosphate fertilizer and benzoyl peroxide
It closes in liquid A, under the conditions of 50 DEG C, 2h is stirred with the speed of 150r/min, obtains mixed liquid B；
S3: when liquid B to be mixed is cooled to 35 DEG C, being added a certain amount of deionized water, is stirred with the speed of 90r/min
20min adds fertilizer additive, is warming up to 75 DEG C, stirs 30min, cooling obtained mixed liquor C with the speed of 150r/min,
Wherein the weight ratio of the deionized water in the deionized water and S3 in the S1 is 1:5；
S4: ph value is measured to mixed liquor C pH test paper, the agent of soil acid-base well-balanced adjustment is made after cooling.
Soil acid-base well-balanced adjustment agent prepared by embodiment one~five is applied on the five of area equation pieces of salt-soda soils respectively
With amount of application is 60kg/ mus, is turned over, and existing soil acid-base regulator is applied by its regulation amount of application as a comparison case
It for equal areas salt-soda soil, is turned over, soil is detected after 10 days, detection data is as follows:
By test data it is found that the soil acid-base well-balanced adjustment agent of the invention based on desulfurized gesso of flue gas is reducing soil
PH value and salt content are superior to existing soil acid-base regulator in terms of improving soil organic matter content, and soil can be effectively reduced
Earth bulk density increases soil porosity and water-holding capacity, and then significantly improves crop yield.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas, which is characterized in that the original including following parts by weight
Material: 30~45 parts of calcium silicate fertilizer, 30~40 parts of vulcanized sodium essence slag, 20~28 parts of dimethylformamide, 16~24 parts of citrate, fertilizer
8~12 parts of feed additives, 8~12 parts of diatomite, 2~6 parts of phosphate fertilizer, 1~3 part of benzoyl peroxide, surplus are deionized water.
2. a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 1, which is characterized in that
Raw material including following parts by weight: 35~40 parts of calcium silicate fertilizer, 32~38 parts of vulcanized sodium essence slag, 22~26 parts of dimethylformamide,
18~22 parts of citrate, 9~11 parts of fertilizer additive, 9~11 parts of diatomite, 3~5 parts of phosphate fertilizer, benzoyl peroxide 1.5~
2.5 parts, surplus be deionized water.
3. a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 1, which is characterized in that
Raw material including following parts by weight: 38 parts of calcium silicate fertilizer, 35 parts of vulcanized sodium essence slag, 24 parts of dimethylformamide, 20 parts of citrate,
10 parts of fertilizer additive, 10 parts of diatomite, 4 parts of phosphate fertilizer, 2 parts of benzoyl peroxide, surplus are deionized water.
4. a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 1, which is characterized in that
The phosphate fertilizer is made of weight fraction ratio of the potassium dihydrogen phosphate and calcium superphosphate of 2:1.
5. a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 1, which is characterized in that
The fertilizer additive is diethyl aminoethyl hexanoate, and the mass ratio of fertilizer additive and diatomite is 1:1.
6. a kind of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 1, which is characterized in that
The mass ratio of the potassium dihydrogen phosphate and benzoyl peroxide is 2:1.
7. a kind of system of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 1-6
Standby technique, which is characterized in that preparation method includes the following steps:
S1: the vulcanized sodium essence slag and diatomite of the above parts by weight are added sequentially to be sufficiently mixed in blender, will be mixed after mixing
A certain amount of deionized water is added in conjunction object to be ground, and the calcium silicate fertilizer of the above parts by weight is added, mixing obtains
Mixed liquor A；
S2: mixed liquor is added sequentially to the dimethylformamide of the above parts by weight, citrate, phosphate fertilizer and benzoyl peroxide
In A, under the conditions of 40~50 DEG C, 1~2h is stirred with the speed of 120~150r/min, obtains mixed liquid B；
S3: when liquid B to be mixed is cooled to 28~35 DEG C, being added a certain amount of deionized water, is stirred with the speed of 60~90r/min
15~20min adds fertilizer additive, is warming up to 60~75 DEG C, stirs 20~30min with the speed of 120~150r/min,
Cooling obtained mixed liquor C；
S4: ph value is measured to mixed liquor C pH test paper, the agent of soil acid-base well-balanced adjustment is made after cooling.
8. a kind of preparation process of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 7,
It is characterized in that, the speed that vulcanized sodium essence slag and diatomite are mixed is 220~250r/min, whipping temp in the S1
It is 30~35 DEG C.
9. a kind of preparation process of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 8,
It is characterized in that, the crushed material fineness after the vulcanized sodium essence slag and diatomite stirring is 60~80 mesh.
10. a kind of preparation process of soil acid-base well-balanced adjustment agent based on desulfurized gesso of flue gas according to claim 7,
It is characterized in that, the weight ratio of the deionized water in deionized water and S3 in the S1 is 1:3~5.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ309825B6 (en) * | 2022-09-07 | 2023-11-08 | Česká zemědělská univerzita v Praze | The method of producing a fertilizer from energy gypsum, a fertilizer and its use |
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