阅读说明：本技术 一种gfx干法脱硫脱硝吸附块的后处理方法 (Post-treatment method of GFX dry desulfurization and denitrification adsorption block ) 是由 李德生 于 2018-06-29 设计创作，主要内容包括：本发明属于废料处理领域,涉及一种GFX干法脱硫脱硝吸附块的后处理方法。该方法能够将使用后的吸附块进行环保处理,包括如下步骤：将GFX干法脱硫脱硝使用后吸附块放置在耐酸反应容器中,加入清水搅拌,加入适量硫酸盐溶液,控制温度20～40℃,搅拌20～30分钟,使吸附块全部溶解或部分溶解,即得到吸附块的硫酸盐溶液；步骤2,上述硫酸盐溶液中加入氨基酸液[C<Sub>4</Sub>H<Sub>4</Sub>NO<Sub>3</Sub>Na]<Sub>x</Sub>,尿素,中量元素、微量元素、络合剂和润湿渗透剂,控制反应温度70～95℃,反应时间20～31分钟,经过滤提纯,制成农用肥料,适合工业化生产,具有较好的应用前景。(The invention belongs to the field of waste treatment, and relates to a post-treatment method of a GFX dry desulfurization and denitrification adsorption block. The method can carry out environment-friendly treatment on the used adsorption block, and comprises the following steps: placing the adsorption block used in the GFX dry desulfurization and denitrification in an acid-resistant reaction container, adding clear water, stirring, adding a proper amount of sulfate solution, controlling the temperature to be 20-40 ℃, stirring for 20-30 minutes, and completely dissolving or partially dissolving the adsorption block to obtain the sulfate solution of the adsorption block; step 2, adding amino acid liquor [ C ] into the sulfate solution 4 H 4 NO 3 Na] x Urea, secondary elements, trace elements, a complexing agent and a wetting penetrant, controlling the reaction temperature to be 70-95 ℃ and the reaction time to be 20-31 minutes, and preparing the agricultural fertilizer by filtering and purifying, wherein the agricultural fertilizer is suitable for industrial production and has a good application prospect.)

1. A post-treatment method of a GFX dry desulfurization and denitrification adsorption block is characterized by comprising the following steps:

step 1, placing an adsorption block used in GFX dry desulfurization and denitrification in an acid-resistant reaction container, adding clear water, stirring, adding a proper amount of sulfate solution, controlling the temperature to be 20-40 ℃, stirring for 20-30 minutes, and completely dissolving or partially dissolving the adsorption block to obtain the sulfate solution of the adsorption block;

step 2, adding amino acid liquor [ C ] into the sulfate solution₄H₄NO₃Na]_xUrea, middle quantumThe preparation method comprises the following steps of preparing the agricultural fertilizer by using elements, trace elements, a complexing agent and a wetting penetrating agent, controlling the reaction temperature to be 70-95 ℃ and the reaction time to be 20-31 minutes, and filtering and purifying.

2. The method as claimed in claim 1, wherein the medium element is at least one or more compounds selected from Ca, Mg, S and Cl, the trace element is at least two or more compounds selected from Zn, Fe, Cu, Mn, Mo, B, Sr and Co, and the amounts of the medium element and the trace element are 10-35% of the total amount of sulfate solution in the adsorption mass.

3. The post-treatment method of the GFX dry desulfurization and denitrification adsorption block according to claim 1, wherein the complexing agent is two or more of sodium ethylene diamine tetracetate, tartaric acid, propylene diamine tetraacetic acid, citric acid and heptonic acid, and the addition amount of the complexing agent is 2-10% of the total amount of sulfate solution of the adsorption block.

4. The method for post-treating the GFX dry desulfurization and denitrification adsorption block according to claim 1, wherein the wetting penetrant is any two of a nonionic surfactant, an anionic surfactant and an amphoteric surfactant, and the addition amount of the wetting penetrant is 0.5-2.5% of the total sulfate solution amount of the adsorption block.

5. The post-treatment method of the GFX dry desulfurization and denitrification adsorption block according to claim 1, wherein the nonionic surfactant is nonionic polyacrylamide or alkylphenol ethoxylate; the anionic surfactant is anionic polyacrylamide, and the amphoteric surfactant is phosphate betaine or carboxylic betaine.

6. The method for post-treating GFX dry desulfurization and denitration adsorption blocks according to claim 1, wherein the undissolved solid adsorption blocks in step 1 are made into magnesium oxide by a common smelting and calcining method, and can be made into adsorption blocks again for reuse.

7. The post-treatment method of the GFX dry desulfurization and denitrification adsorption block according to claim 1, wherein sodium chloride powder, iron powder and a water reducing agent are added into the sulfate solution of the adsorption block in the step 1, and the mixture is continuously stirred, the reaction temperature is controlled to be 40-60 ℃, and the reaction time is controlled to be 40-60 minutes, so that humic acid is obtained; and (3) adjusting the pH value of the humic acid to 6-7 by using potassium hydroxide or potassium carbonate, continuing to react for 20-30 minutes, adding a wetting penetrating agent, and mixing for 30-60 minutes to prepare the cement expanding agent.

8. The post-treatment method of the GFX dry desulfurization and denitrification adsorption block according to claim 1, wherein the water reducer is an HSB aliphatic high-efficiency water reducer or a fatty acid high-efficiency water reducer.

Technical Field

The invention belongs to the field of waste treatment, and relates to a post-treatment method of a GFX dry desulfurization and denitrification adsorption block.

Background

The national requirements for flue gas treatment are higher and higher, the dry desulfurization and denitration method has gradually replaced the wet desulfurization and denitration market, the GFX dry desulfurization and denitration integrated technology is the first-push mainstream technology of the dry market, see patents 201610891343.0 and 201710218412.6, although the technical effect is good, the post-treatment of the used adsorption block is a difficult problem to be overcome.

The adsorption block used in the GFX dry desulfurization and denitrification process is complex in component and tedious in treatment, the existing treatment method is landfill, but the landfill is not subjected to harmless treatment, and a large amount of chemical substances are remained; the method not only does not realize the resource treatment of the garbage, but also occupies a large amount of land. The competent departments at all levels of the government of China know that the problems of the treatment technology are forbidden and gradually eliminate the behaviors.

Therefore, the development of an environment-friendly post-treatment method for the adsorption block used in the GFX dry desulfurization and denitrification is a problem to be solved at present.

Disclosure of Invention

The invention aims to: aiming at the problems, the method for post-treating the GFX dry desulfurization and denitrification adsorption block can carry out environment-friendly treatment on the used adsorption block, wherein one part of the adsorption block is used for obtaining agricultural fertilizer, humic acid and cement expanding agent, and the other part of the adsorption block is calcined for obtaining magnesium oxide or is made into the adsorption block for reuse, so that the method has a good application prospect.

In order to achieve the above purpose, the invention adopts the following technical scheme:

a post-treatment method of a GFX dry desulfurization and denitrification adsorption block comprises the following steps:

step 1, placing an adsorption block used in GFX dry desulfurization and denitrification in an acid-resistant reaction container, adding clear water, stirring, adding a proper amount of sulfate solution, controlling the temperature to be 20-40 ℃, stirring for 20-30 minutes, and completely dissolving or partially dissolving the adsorption block to obtain the sulfate solution of the adsorption block;

step 2, adding amino acid liquor [ C ] into the sulfate solution₄H₄NO₃Na]_xUrea, secondary elements, trace elements, a complexing agent and a wetting penetrant, wherein the reaction temperature is controlled to be 70-95 ℃, and the reaction time is 20And (5) filtering and purifying for 31 minutes to prepare the agricultural fertilizer.

The secondary elements are at least one or more compounds containing Ca, Mg, S and Cl, the trace elements are at least two or more compounds containing Zn, Fe, Cu, Mn, Mo, B, Sr and Co, and the addition amount of the secondary elements and the trace elements is 10-35% of the total amount of the sulfate solution of the adsorption block.

The complexing agent is two or more of sodium ethylene diamine tetracetate, tartaric acid, propylene diamine tetraacetic acid, citric acid and heptonic acid, and the addition amount of the complexing agent is 2-10% of the total amount of the sulfate solution of the adsorption block.

The wetting penetrant is any two of a nonionic surfactant, an anionic surfactant and an amphoteric surfactant, and the nonionic surfactant is nonionic polyacrylamide or alkylphenol ethoxylates; the anionic surfactant is anionic polyacrylamide, the amphoteric surfactant is phosphate betaine or carboxylic betaine, and the addition amount of the wetting penetrant is 0.5-2.5% of the total amount of sulfate solution of the adsorption block.

And (3) preparing the undissolved solid adsorption blocks in the step (1) into magnesium oxide by a general smelting and calcining mode, and preparing the solid adsorption blocks into adsorption blocks again for reuse.

Further, according to another treatment method provided by the invention, sodium chloride powder, iron powder and a water reducing agent can be added into the sulfate solution of the adsorption block in the step 1, the mixture is continuously stirred, the reaction temperature is controlled to be 40-60 ℃, and the reaction time is controlled to be 40-60 minutes, so that humic acid is obtained; and (3) adjusting the pH value of the humic acid to 6-7 by using potassium hydroxide or potassium carbonate, continuing to react for 20-30 minutes, adding a wetting penetrating agent, and mixing for 30-60 minutes to prepare the cement expanding agent.

The water reducing agent is an HSB aliphatic high-efficiency water reducing agent or a fatty acid high-efficiency water reducing agent.

The adsorption block used in the GFX dry desulfurization and denitrification technology contains the following components as shown in Table 1.

TABLE 1 adsorption Block composition after use

Compared with the prior art, the invention has the following technical advantages:

1. according to the traditional treatment mode, the adsorption blocks can only be landfilled after being used, and can be treated in a landfilling mode, the adsorption blocks become industrial garbage, and for example, an electrolytic aluminum enterprise in Henan, 180 tons of adsorption blocks are required to be landfilled every year, namely 180 tons of industrial garbage exist every year. The purified solution can be prepared into agricultural fertilizer by the treatment of the technology of the invention, and can be directly used, thereby changing waste into valuable.

2. The adsorption block treated by the technology of the invention can be prepared into an agricultural fertilizer from a purified solution and can also be prepared into a cement expanding agent for use, wherein the cement expanding agent is a chemical additive and is added into cement, and when the cement is coagulated and hardened, the cement expanding agent expands along with the volume of the cement, so that the adsorption block plays roles of compensating shrinkage and stretching a reinforcing steel bar to generate prestress and fully filling a cement gap. The adsorption blocks which are not buried any more are reused again, so that the recycling is realized;

3. the used adsorption block is made into magnesium oxide which can be directly used, thus saving raw material resources and mining cost.

4. The landfill treatment mode of the original adsorption block is actually a pollution mode to the environment, the adsorption block after landfill exists in soil, and bottom mud is often a 'storage warehouse' of the adsorption block. When the environment changes, the metal form in the bottom mud is transformed and released to cause pollution. The metal can not be biodegraded, but has the biological accumulation property, and can directly threaten higher organisms including human beings, and related experts indicate that the metal has irreversible conversion to the pollution of the soil, the polluted soil has no treatment value, and only planting varieties can be adjusted to avoid the pollution. Therefore, the problem of bottom sediment metal pollution is increasingly paid attention by people. The treatment is not carried out in a landfill mode, so that the pollution to the environment is avoided.

Drawings

FIG. 1 is a flow chart of a post-processing method of the present invention.

Detailed Description