阅读说明：本技术 一种高效资源利用烷基化废硫酸生产镁肥的方法 (Method for producing magnesium fertilizer by using alkylated waste sulfuric acid as efficient resource ) 是由 贾玉德 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种高效资源利用烷基化废硫酸生产镁肥的方法,包括如下步骤：将菱镁矿粉和水搅拌均匀,加入烷基化废硫酸,搅拌状态下升温,继续搅拌得到预制料；向预制料中加入轻烧镁粉至体系呈中性,继续搅拌,压滤分离得到母液与废渣,将母液依次经过脱色、重结晶、干燥,制得七水硫酸镁晶体；将废渣、废弃秸秆、骨胶、废弃煤渣研磨均匀,500-600℃煅烧2-6min,降至室温,研磨至粒径≤0.1mm,加入聚乙烯醇水溶液进行造粒,200-240℃煅烧10-20min,冷却至室温,得到镁肥。本发明不仅工艺简单,使所有资源使用的得到最优化,而且成本低,无二次污染的风险；同时所得镁肥能改良土壤,有效提高农作物的产量与品质。(The invention discloses a method for producing magnesium fertilizer by using alkylated waste sulfuric acid as a high-efficiency resource, which comprises the following steps: uniformly stirring magnesite powder and water, adding alkylated waste sulfuric acid, heating while stirring, and continuously stirring to obtain a prefabricated material; adding light-burned magnesium powder into the prefabricated material until the system is neutral, continuously stirring, performing filter pressing separation to obtain mother liquor and waste residues, and sequentially decoloring, recrystallizing and drying the mother liquor to obtain magnesium sulfate heptahydrate crystals; grinding the waste residues, the waste straws, the bone glue and the waste coal slag uniformly, calcining at the temperature of 500-600 ℃ for 2-6min, cooling to room temperature, grinding until the particle size is less than or equal to 0.1mm, adding a polyvinyl alcohol aqueous solution for granulation, calcining at the temperature of 200-240 ℃ for 10-20min, and cooling to room temperature to obtain the magnesium fertilizer. The invention not only has simple process and optimized use of all resources, but also has low cost and no risk of secondary pollution; meanwhile, the obtained magnesium fertilizer can improve soil and effectively improve the yield and quality of crops.)

1. A method for producing magnesium fertilizer by using alkylated waste sulfuric acid with high efficiency resources is characterized by comprising the following steps:

s1, uniformly stirring the magnesite powder and water, adding alkylated waste sulfuric acid, heating to 90-100 ℃ under the stirring state, and continuously stirring for 40-60min to obtain a prefabricated material;

s2, adding light-burned magnesium powder into the prefabricated material until the system is neutral, continuously stirring, performing filter pressing separation to obtain mother liquor and waste residues, and sequentially decoloring, recrystallizing and drying the mother liquor to obtain magnesium sulfate heptahydrate crystals;

s3, grinding the waste residues, the waste straws, the bone glue and the waste coal cinder uniformly, calcining at the temperature of 500-600 ℃ for 2-6min, cooling to room temperature, grinding until the particle size is less than or equal to 0.1mm, adding a polyvinyl alcohol aqueous solution for granulation, calcining at the temperature of 200-240 ℃ for 10-20min, and cooling to room temperature to obtain the magnesium fertilizer with the particle size of 0.2-1 mm.

2. The method for producing the magnesium fertilizer by using the alkylated waste sulfuric acid with high efficiency and resources as claimed in claim 1, wherein the content of magnesium oxide in the magnesite powder is 20-30wt% in S1.

3. The method for producing the magnesium fertilizer by using the alkylated waste sulfuric acid as the high-efficiency resource according to claim 1, wherein the concentration of the alkylated waste sulfuric acid in S1 is 85-95 wt%.

4. The method for producing the magnesium fertilizer by using the alkylated waste sulfuric acid as the high-efficiency resource according to claim 2 or 3, wherein in S1, the mass ratio of the magnesite powder, the water and the alkylated waste sulfuric acid is 100: 200-300: 60-80.

5. The method for producing the magnesium fertilizer by using the alkylated waste sulfuric acid with high efficiency and resources as claimed in claim 1, wherein the concentration of the aqueous solution of polyvinyl alcohol in S3 is 2-5 wt%.

6. The method for producing the magnesium fertilizer by using the alkylated waste sulfuric acid with high efficiency and resources as claimed in claim 5, wherein in S3, the mass ratio of the waste residue, the waste straw, the bone glue, the waste coal cinder and the polyvinyl alcohol aqueous solution is 100: 4-12: 2-4: 1-3: 20-40.

7. The method for producing the magnesium fertilizer by using the alkylated waste sulfuric acid with high efficiency and resources as claimed in claim 1, wherein the particle size of the magnesium fertilizer obtained from S3 is 0.2-1 mm.

8. The method for producing the magnesium fertilizer by using the alkylated waste sulfuric acid as the high-efficiency resource according to claim 1, wherein the magnesium fertilizer obtained in the step S3 contains 32-38wt% of silicon, 20-24wt% of calcium (calculated as calcium oxide), 11-15wt% of magnesium (calculated as magnesium oxide), 2-6wt% of sulfur (calculated as sulfur dioxide) and the balance of impurities.

Technical Field

The invention relates to the technical field of recycling of alkylated waste sulfuric acid, in particular to a method for producing a magnesium fertilizer by efficiently utilizing alkylated waste sulfuric acid.

Background

The alkylation waste sulfuric acid contains a large amount of organic matters, the existing treatment technology mainly comprises the steps of cracking and regenerating sulfuric acid for recycling, the equipment investment is huge, the cost for treating each ton of waste sulfuric acid is extremely high, the loss is huge, great pressure is brought to the cost and the environment of a production enterprise, and the biggest problem which troubles the production of the enterprise is solved. With the improvement of international requirements on fuel oil, the output of isooctane produced by alkylation is increased rapidly, and the output of waste sulfuric acid produced by alkylation is increased year by year.

At present, the magnesium fertilizer is widely used in China, magnesium is a component of chlorophyll and is the only heavy metal element in chlorophyll molecules, because chlorophyll is the core of plant photosynthesis, the plants lack of magnesium, the chlorophyll is inevitably reduced, the appearance of the plants has chlorosis, the photosynthesis is weakened, and the synthesis of carbohydrates, proteins and fat is influenced. In addition, magnesium is not only an activator for various enzymes, but also an essential component of polymeric sugar, and a proper amount of magnesium can stabilize the structure of ribosome and improve the quality of crops.

At present, various silicon-containing waste slag is mostly used for producing magnesium fertilizer in China, but the particles of the magnesium fertilizer are generally hard and have low fertilizer efficiency, so how to prepare the magnesium fertilizer with good fertilizer efficiency and low cost by adopting the alkylated waste sulfuric acid has extremely good market prospect.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a method for producing magnesium fertilizer by using alkylated waste sulfuric acid with high-efficiency resources.

A method for producing magnesium fertilizer by using alkylated waste sulfuric acid with high efficiency resources comprises the following steps:

s1, uniformly stirring the magnesite powder and water, adding alkylated waste sulfuric acid, heating to 90-100 ℃ under the stirring state, and continuously stirring for 40-60min to obtain a prefabricated material;

s2, adding light-burned magnesium powder into the prefabricated material until the system is neutral, continuously stirring, performing filter pressing separation to obtain mother liquor and waste residues, and sequentially decoloring, recrystallizing and drying the mother liquor to obtain magnesium sulfate heptahydrate crystals;

s3, grinding the waste residues, the waste straws, the bone glue and the waste coal cinder uniformly, calcining at the temperature of 500-600 ℃ for 2-6min, cooling to room temperature, grinding until the particle size is less than or equal to 0.1mm, adding a polyvinyl alcohol aqueous solution for granulation, calcining at the temperature of 200-240 ℃ for 10-20min, and cooling to room temperature to obtain the magnesium fertilizer with the particle size of 0.2-1 mm.

Preferably, in S1, the magnesia content in the magnesite powder is 20-30 wt%.

Preferably, in S1, the concentration of the waste sulfuric acid from alkylation is 85-95 wt%.

Preferably, in S1, the mass ratio of magnesite powder, water and alkylated waste sulfuric acid is 100: 200-300: 60-80.

Preferably, in S3, the concentration of the polyvinyl alcohol aqueous solution is 2-5 wt%.

Preferably, in S3, the mass ratio of the waste residue, the waste straw, the bone glue, the waste coal cinder and the polyvinyl alcohol aqueous solution is 100: 4-12: 2-4: 1-3: 20-40.

Preferably, the particle size of the magnesium fertilizer obtained from S3 is 0.2-1 mm.

Preferably, the magnesium fertilizer obtained in S3 has silicon content of 32-38wt%, calcium content (calculated as calcium oxide) of 20-24wt%, magnesium content (calculated as magnesium oxide) of 11-15wt%, sulfur content (calculated as sulfur dioxide) of 2-6wt%, and the balance of impurities.

The invention has the following technical effects:

(1) the method adopts magnesite powder to remove acid oil waste in the alkylated waste sulfuric acid, carbonizes organic matters in the waste slag by calcining the waste slag, and prepares the magnesium fertilizer by compounding and granulating the carbonized organic matters with waste straws, bone glue and waste coal slag, so that the method has the advantages of simple process, simple and convenient operation, low cost and no risk of secondary pollution;

(2) according to the invention, the waste residues, the waste straws and the bone glue are ground and then calcined, inorganic matters in the waste residues can be fully fixed by the structure of the organic carbide, so that the nutrient absorption and utilization rate of crops is improved, and meanwhile, the carbonized waste residues and the waste coal residues can ensure that a stable support structure is formed, so that moisture and air in soil can conveniently enter, the soil structure is adjusted, the soil improvement effect is obvious, and the yield and the quality of crops are effectively improved;

(3) the method prepares the magnesium sulfate heptahydrate crystal by sequentially decoloring, recrystallizing and drying the mother liquor after filter pressing, and prepares the high-efficiency magnesium fertilizer by calcining, grinding, granulating and other processes of the waste liquor, so that all resources are optimally used, and the method has the advantages of simple process, no secondary pollution and low cost.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.