阅读说明：本技术 一种阻止磷石膏尾矿回用废水结垢的药剂及其制备方法 (Agent for preventing scale formation of phosphogypsum tailing recycled wastewater and preparation method thereof ) 是由 张岳安 戴锐 刘争辉 邓金元 于 2021-09-09 设计创作，主要内容包括：本发明公开了一种阻止磷石膏尾矿回用废水结垢的药剂及其制备方法；所述药剂的成分包括碱性化合物、增溶剂、水；所述碱性化合物、增溶剂、水的含量为：碱性化合物3～10％、增溶剂0.1～5％,余量为水。其制备方法包括以下步骤：S1、按比例称取含钙化合物、含钠化合物、含镁化合物、含钾化合物并将其混合,加入水后搅拌均匀,得到防结垢混合物；S2、在防结垢混合物中加入称量后的增溶剂,再次搅拌均匀；S3、对加入增溶剂的防结垢混合物蒸发去除多余水分,破碎后即得到所制备药剂。(The invention discloses a medicament for preventing phosphogypsum tailings from scaling in recycled wastewater and a preparation method thereof; the components of the medicament comprise an alkaline compound, a solubilizer and water; the contents of the alkaline compound, the solubilizer and the water are as follows: 3-10% of alkaline compound, 0.1-5% of solubilizer and the balance of water. The preparation method comprises the following steps: s1, weighing and mixing a calcium-containing compound, a sodium-containing compound, a magnesium-containing compound and a potassium-containing compound according to the proportion, adding water, and uniformly stirring to obtain an anti-scaling mixture; s2, adding the weighed solubilizer into the anti-scaling mixture, and stirring uniformly again; s3, evaporating the anti-scaling mixture added with the solubilizer to remove redundant water, and crushing to obtain the prepared medicament.)

1. The agent for preventing the scale formation of the phosphogypsum tailings recycled wastewater is characterized by comprising the following components in parts by weight: the components of the medicament comprise an alkaline compound, a solubilizer and water; the contents of the alkaline compound, the solubilizer and the water are as follows: 3-10% of alkaline compound, 0.1-5% of solubilizer and the balance of water.

2. The agent for preventing scaling of phosphogypsum tailings reclaimed wastewater according to claim 1, which is characterized in that: the alkaline compound is a mixture of three or four of a calcium-containing compound, a sodium-containing compound, a magnesium-containing compound and a potassium-containing compound; the content of the calcium-containing compound is 0-80% of the mass of the alkaline compound, the content of the sodium-containing compound is 0-40% of the mass of the alkaline compound, the content of the magnesium-containing compound is 0-40% of the mass of the alkaline compound, and the content of the potassium-containing compound is 0-20% of the mass of the alkaline compound.

3. The agent for preventing scaling of phosphogypsum tailings reclaimed wastewater according to claim 2, which is characterized in that: the calcium-containing compound is one or more of calcium oxide, calcium carbonate and calcium hydroxide; the sodium-containing compound is one or mixture of sodium carbonate and sodium hydroxide; the magnesium-containing compound is one or more of magnesium oxide, magnesium carbonate and magnesium hydroxide; the potassium-containing compound is one or a mixture of potassium carbonate and potassium hydroxide.

4. The agent for preventing scaling of phosphogypsum tailings reclaimed wastewater according to claim 3, which is characterized in that: the solubilizer is one or a mixture of guanidine gum, sodium citrate and sodium dodecyl benzene sulfonate.

5. The agent for preventing scaling of phosphogypsum tailings reclaimed wastewater according to claim 4, which is characterized in that: the agent and the auxiliary reagent are matched for use, the auxiliary reagent is added after a period of time after the agent is added, and the ratio of the adding amount of the auxiliary reagent to the amount of wastewater is 1: 500-2000.

6. The agent for preventing scaling of phosphogypsum tailings reclaimed wastewater according to claim 5, which is characterized in that: the auxiliary reagent is aluminum chloride, and is put 30 minutes after the medicament is put.

7. The preparation method of the agent for preventing the scaling of the phosphogypsum tailings reclaimed wastewater, which is disclosed by claim 4, is characterized by comprising the following steps: the method comprises the following steps:

s1, weighing and mixing a calcium-containing compound, a sodium-containing compound, a magnesium-containing compound and a potassium-containing compound according to the proportion, adding water, and uniformly stirring to obtain an anti-scaling mixture;

s2, adding the weighed solubilizer into the anti-scaling mixture, and stirring uniformly again;

s3, evaporating the anti-scaling mixture added with the solubilizer to remove redundant water, and crushing to obtain the prepared medicament.

Technical Field

The invention relates to the field of phosphorus chemical industry, in particular to a medicament for preventing phosphogypsum tailings from scaling in recycled wastewater and a preparation method thereof.

Background

The wet preparation of phosphoric acid refers to the dissolution of phosphate ore with acids such as sulfuric acid, hydrochloric acid, nitric acid, etc. And discharging the dissolved waste slag and wastewater to a tailing pond for stacking and sedimentation, and recycling the stacked and sedimentated wastewater. In the process of recycling the wastewater, the SiF in the wastewater is caused to be stored₆ ^2-、K⁺、Na⁺The continuous enrichment of plasma, and the waste water temperature of discharging to the tailing storehouse from the workshop is higher, finally leads to in the waste water fluosilicate supersaturation, and the pipeline temperature reduces during the retrieval and utilization, and rivers disturbance is violent, causes the fluosilicate in the waste water to separate out in pipeline, causes pipeline to block, influences enterprise's production.

At present, measures for preventing and controlling fluorosilicate scaling at home and abroad mainly comprise technologies such as water cleaning of pipelines, slurry concentration reduction, chemical reagent addition for cleaning of pipelines, mechanical cleaning of pipelines and the like, but the technologies have poor use effect and cannot meet the production requirements of enterprises; therefore, a technology which is easy to operate and low in cost is urgently needed to be found for solving the problem of scaling of the phosphogypsum recycling wastewater pipeline.

Disclosure of Invention

The invention aims to solve the problems and provides a medicament for effectively preventing the phosphogypsum tailings from scaling in the recycled wastewater and a preparation method thereof.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a medicament for preventing the scale formation of the phosphogypsum tailings recycled wastewater comprises an alkaline compound, a solubilizer and water; the contents of the alkaline compound, the solubilizer and the water are as follows: 3-10% of alkaline compound, 0.1-5% of solubilizer and the balance of water.

Further, the alkaline compound is a mixture of three or four of a calcium-containing compound, a sodium-containing compound, a magnesium-containing compound and a potassium-containing compound; the content of the calcium-containing compound is 0-80% of the mass of the alkaline compound, the content of the sodium-containing compound is 0-40% of the mass of the alkaline compound, the content of the magnesium-containing compound is 0-40% of the mass of the alkaline compound, and the content of the potassium-containing compound is 0-20% of the mass of the alkaline compound.

Further, the calcium-containing compound is one or more of calcium oxide, calcium carbonate and calcium hydroxide; the sodium-containing compound is one or mixture of sodium carbonate and sodium hydroxide; the magnesium-containing compound is one or more of magnesium oxide, magnesium carbonate and magnesium hydroxide; the potassium-containing compound is one or a mixture of potassium carbonate and potassium hydroxide.

Further, the solubilizer is one or a mixture of two of guanidine gum, sodium citrate and sodium dodecyl benzene sulfonate.

Furthermore, the medicament and the auxiliary reagent are matched for use, the auxiliary reagent is added after a period of time after the medicament is added, and the ratio of the adding amount of the auxiliary reagent to the amount of the wastewater is 1: 500-2000.

Further, the auxiliary reagent is aluminum chloride, and is administered 30 minutes after the administration of the medicament.

A preparation method of a medicament for preventing scale formation of phosphogypsum tailings recycled wastewater comprises the following steps:

s1, weighing and mixing a calcium-containing compound, a sodium-containing compound, a magnesium-containing compound and a potassium-containing compound according to the proportion, adding water, and uniformly stirring to obtain an anti-scaling mixture;

s2, adding the weighed solubilizer into the anti-scaling mixture, and stirring uniformly again;

s3, evaporating the anti-scaling mixture added with the solubilizer to remove redundant water, and crushing to obtain the prepared medicament.

Compared with the prior art, the invention has the advantages and positive effects that:

(1) when the agent is used, only the agent needs to be added into the phosphogypsum tailing reuse wastewater, salt inhibiting substances can be slowly released, the long-time salt inhibiting effect is achieved, meanwhile, the salt inhibiting and solubilizing process is combined, the period of cleaning scales of a wastewater pipeline can be prolonged by more than 12 times, and the economic cost of cleaning the pipeline is effectively reduced.

(2) The raw materials adopted by the medicament are all pollution-free and non-toxic substances, and meanwhile, the medicament is easy to obtain and low in price, and the prepared medicament has an obvious effect of reducing scaling, and is suitable for large-scale production and popularization.

(3) The medicament provided by the invention combines scale inhibition and solubilization processes by adding a solubilization medicament during preparation, prolongs the scaling period of a phosphogypsum wastewater pipeline, and brings convenience to the recycling operation of phosphogypsum tailing wastewater.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.

Example 1, calcium oxide, magnesium carbonate and sodium hydroxide are weighed and mixed to prepare a basic compound, the ratio of the calcium oxide to the magnesium carbonate to the sodium hydroxide is 6:3:2, the proportion of the added water is 10 times of the mass of the basic compound, sodium dodecyl benzene sulfonate with the mass of 0.3 time of the mass of the basic compound is added after stirring for 30min, and the phosphogypsum wastewater scale inhibition medicament is obtained after stirring and evaporation at the constant temperature of 80 ℃ for 30 min.

The test water adopted by the embodiment is the reuse wastewater of the phosphogypsum tailing pond of a phosphorus chemical enterprise in Hubei, the wastewater contains 1.234g/L of fluosilicic acid root ions, and the ratio of the adding amount of the scale inhibiting agent to the phosphogypsum wastewater is 1: 300, stirring for 30min, and then adding aluminum chloride, wherein the ratio of the aluminum chloride to the amount of the wastewater is 1: 1800, filtering, and reducing the concentration of fluosilicic acid radical ions in the liquid sample to 0.560 g/L.

Example 2, calcium oxide, calcium carbonate, magnesium carbonate, and sodium hydroxide are weighed and mixed to prepare an alkaline compound, wherein the mass ratio of the calcium oxide to the calcium carbonate to the magnesium carbonate to the sodium hydroxide is 6: 2: 4: 1, adding water in a proportion of 20 times of the mass of the alkaline compound, stirring for 30min, adding sodium dodecyl benzene sulfonate in an amount of 0.1 time of the mass of the alkaline compound, stirring at a constant temperature of 80 ℃, and evaporating for 35min to obtain the phosphogypsum wastewater scale inhibition agent.

The test water adopted by the embodiment is the reuse wastewater of the phosphogypsum tailing pond of a phosphorus chemical enterprise in Hubei, the wastewater contains 1.234g/L of fluosilicic acid root ions, and the ratio of the adding amount of the scale inhibiting agent to the phosphogypsum wastewater is 1: 270, adding aluminum chloride after stirring for 30min, wherein the ratio of the aluminum chloride to the amount of wastewater is 1: 1500; filtering, and reducing the concentration of fluosilicate ions in the liquid sample to 0.430 g/L.

Example 3, calcium oxide, calcium carbonate, magnesium carbonate, sodium hydroxide, and potassium hydroxide are weighed and mixed to prepare an alkaline compound, wherein the mass ratio of the calcium oxide, the calcium carbonate, the magnesium carbonate, the sodium hydroxide, and the potassium hydroxide is 6: 2: 4: 1: 1, adding water in a proportion of 20 times of the mass of the alkaline compound, stirring for 30min, adding sodium dodecyl benzene sulfonate in an amount of 0.1 time of the mass of the alkaline compound, stirring at a constant temperature of 80 ℃, and evaporating for 35min to obtain the phosphogypsum wastewater scale inhibition agent.

The test water adopted by the embodiment is the reuse wastewater of the phosphogypsum tailing pond of a phosphorus chemical enterprise in Hubei, the wastewater contains 1.234g/L of fluosilicic acid root ions, and the ratio of the adding amount of the scale inhibiting agent to the phosphogypsum wastewater is 1: 270, adding aluminum chloride after stirring for 30min, wherein the ratio of the aluminum chloride to the amount of wastewater is 1: 1300, respectively; filtering, and reducing the concentration of fluosilicic acid radical ions in the liquid sample to 0.290 g/L.

Example 4, calcium oxide, calcium carbonate, magnesium hydroxide, sodium hydroxide, and potassium hydroxide are weighed and mixed to prepare an alkaline compound, wherein the mass ratio of the calcium oxide to the calcium carbonate to the magnesium hydroxide to the sodium hydroxide to the potassium hydroxide is 6: 2: 3: 1: 1, adding water in a proportion of 20 times of the mass of the alkaline compound, stirring for 30min, adding sodium dodecyl benzene sulfonate in an amount of 0.1 time of the mass of the alkaline compound, stirring at a constant temperature of 80 ℃, and evaporating for 35min to obtain the phosphogypsum wastewater scale inhibition agent.

The test water adopted by the embodiment is the reuse wastewater of the phosphogypsum tailing pond of a phosphorus chemical enterprise in Hubei, the wastewater contains 1.234g/L of fluosilicic acid root ions, and the ratio of the adding amount of the scale inhibiting agent to the phosphogypsum wastewater is 1: 180, stirring for 30min, and then adding aluminum chloride, wherein the ratio of the aluminum chloride to the amount of wastewater is 1: 1200; filtering, and reducing the concentration of fluosilicate ions in the liquid sample to 0.110 g/L.

Example 5, calcium oxide, calcium carbonate, magnesium hydroxide, sodium hydroxide, and potassium hydroxide are weighed and mixed to prepare an alkaline compound, wherein the mass ratio of the calcium oxide to the calcium carbonate to the magnesium hydroxide to the sodium hydroxide to the potassium hydroxide is 6: 2: 3: 1: 1, adding water in a proportion of 20 times of the mass of the alkaline compound, stirring for 30min, adding sodium dodecyl benzene sulfonate in an amount of 0.1 time of the mass of the alkaline compound, stirring at a constant temperature of 80 ℃, and evaporating for 35min to obtain the phosphogypsum wastewater scale inhibition agent.

The test water adopted by the embodiment is the reuse wastewater of the phosphogypsum tailing pond of a phosphorus chemical enterprise in Hubei, the wastewater contains 1.234g/L of fluosilicic acid root ions, and the ratio of the adding amount of the scale inhibiting agent to the phosphogypsum wastewater is 1: 180, stirring for 30min, and then adding aluminum chloride, wherein the ratio of the aluminum chloride to the amount of wastewater is 1: 1100, 1100; filtering, and reducing the concentration of fluosilicate ions in the liquid sample to 0.110 g/L.

Example 6, calcium oxide, calcium carbonate, magnesium hydroxide, sodium hydroxide, and potassium hydroxide are weighed and mixed to prepare an alkaline compound, wherein the mass ratio of the calcium oxide to the calcium carbonate to the magnesium hydroxide to the sodium hydroxide to the potassium hydroxide is 6: 2: 2: 2: 1: 1, adding water in a proportion of 20 times of the mass of the alkaline compound, stirring for 30min, adding sodium citrate in an amount of 0.5 time of the mass of the alkaline compound, stirring and evaporating at a constant temperature of 80 ℃ for 35min to obtain the phosphogypsum wastewater scale inhibition agent.

The test water adopted by the embodiment is the reuse wastewater of the phosphogypsum tailing pond of a phosphorus chemical enterprise in Hubei, the wastewater contains 1.234g/L of fluosilicic acid root ions, and the ratio of the adding amount of the scale inhibiting agent to the phosphogypsum wastewater is 1: 150, stirring for 30min, and then adding aluminum chloride, wherein the ratio of the aluminum chloride to the wastewater is 1: 1000, parts by weight; filtering, and reducing the concentration of fluosilicic acid radical ions in the liquid sample to 0 g/L.

Through research and analysis, the phosphogypsum wastewater is acidic wastewater, the scale generated in the water is mainly potassium fluosilicate, and the alkaline oxide is added to adjust the pH value of the wastewater and decompose fluosilicic acid radicals, so that the scale generated by the generation of the potassium fluosilicate is inhibited; experiments carried out by the embodiment prove that the medicament prepared by the invention has excellent anti-scaling effect and can be widely applied to the recycling operation of phosphogypsum wastewater.

The invention has the following effects:

(1) when the agent is used, only the agent needs to be added into the phosphogypsum tailing reuse wastewater, salt inhibiting substances can be slowly released, the long-time salt inhibiting effect is achieved, meanwhile, the salt inhibiting and solubilizing process is combined, the period of cleaning scales of a wastewater pipeline can be prolonged by more than 12 times, and the economic cost of cleaning the pipeline is effectively reduced.

(2) The raw materials adopted by the medicament are all pollution-free and non-toxic substances, and meanwhile, the medicament is easy to obtain and low in price, and the prepared medicament has an obvious effect of reducing scaling, and is suitable for large-scale production and popularization.

(3) The medicament provided by the invention combines scale inhibition and solubilization processes by adding a solubilization medicament during preparation, prolongs the scaling period of a phosphogypsum wastewater pipeline, and brings convenience to the recycling operation of phosphogypsum tailing wastewater.