1. A method for rapidly judging whether the content of calcium hydroxide is qualified or not is characterized by comprising the following steps:

adding a calcium hydroxide desulfurizer sample to be detected into a determination reagent and stirring;

after standing, observing whether the color of the solution changes; wherein:

the determination reagent comprises sucrose, hydrochloric acid, distilled water and phenolphthalein indicator.

2. A determination reagent for rapidly determining whether or not a calcium hydroxide content is acceptable, the determination reagent comprising: sucrose, distilled water, hydrochloric acid and phenolphthalein indicator.

3. The reagent for rapidly judging whether or not the calcium hydroxide content is acceptable according to claim 2, wherein:

the concentration of the sucrose solution is 30%;

the concentration of the hydrochloric acid solution is 1.00 mol/l;

the phenolphthalein indicator was at least 3 drops (burette titration).

4. The reagent for rapidly determining whether or not the calcium hydroxide content is acceptable according to claim 2, wherein the volume ratio of the determination reagent is:

30% sucrose solution: distilled water: 1.00mol/l hydrochloric acid solution: the volume ratio of the phenolphthalein indicator is 50.0: 11.5: phenolphthalein indicator was at least 3 drops (burette titration).

5. The reagent of claim 2, wherein the reagent is used for determining whether the calcium hydroxide content in the calcium hydroxide desulfurizer is not less than 85% by mass.

6. A preparation method of a determination reagent for rapidly determining whether the content of calcium hydroxide is qualified is characterized by comprising the following steps:

weighing 50 parts by volume of the sucrose solution with the concentration of 30%;

adding 50 parts by volume of distilled water into the sucrose solution;

accurately adding 11.50 parts by volume of the 1.00mol/l HCl solution,

adding at least 3 drops of the phenolphthalein indicator (titrating by a burette), uniformly mixing, sealing, refrigerating and storing.

7. The reagent for rapidly judging whether or not the calcium hydroxide content is acceptable according to claim 6, wherein:

the refrigeration preservation temperature is 0-8 ℃.

8. A method for rapidly judging whether the content of calcium hydroxide is qualified or not is characterized by comprising the following steps:

preparing a determination reagent for rapidly determining whether the calcium hydroxide content is qualified according to claim 6, and pouring the determination reagent into a conical flask;

adding a calcium hydroxide desulfurizer sample to be detected into a conical flask, stirring and standing;

when the solution is pink after standing, the content of calcium hydroxide is more than or equal to 85 percent, and the index is qualified; if the color is not clear, the index is not qualified.

9. The method of claim 8, wherein: the stirring time is at least 15 minutes.

Background

With the increasing sulfur content in the prebaked anode, the sulfur dioxide content in the electrolytic flue gas is also increased, and the pollution to the environment is more and more serious, so that the flue gas desulfurization is imperative.

At present, the electrolytic flue gas desulfurization adopts a lime semidry method, namelySpraying the calcium hydroxide desulfurizer into the desulfurizing tower to electrolyze SO in the flue gas₂Reaction takes place for desulfurization. In the process of desulfurization reaction, part of calcium hydroxide is mixed into desulfurized ash after desulfurization without participating in reaction, in order to reduce material consumption and operation cost, the desulfurized ash needs to be circulated again or for multiple times to ensure that the calcium hydroxide fully participates in the desulfurization reaction, and after the content of the calcium hydroxide in the desulfurized ash is reduced to a certain value, on one hand, the desulfurized ash needs to be discharged out of a desulfurization system, and on the other hand, fresh calcium hydroxide needs to be supplemented into the desulfurization system. Once the calcium hydroxide raw material does not meet the requirements of technical indexes (the content of calcium hydroxide is 85 percent), the production process must be adjusted in time, the running time of the desulfurization process can be shortened, the running cost is increased, and even the whole desulfurization system is paralyzed; if the desulfurizing tower is blocked and is difficult to clean, the qualified raw material of the desulfurizing agent is very important, and the main component of the desulfurizing agent is calcium hydroxide, so whether the content of the calcium hydroxide meets the requirement or not becomes an important index for judging whether the desulfurizing agent is qualified or not. The calcium hydroxide content in the desulfurizer needs to be detected when the desulfurizer is delivered, the calcium hydroxide content is determined by an acid-base titration method at present, a sample needs to be analyzed and detected for several hours, and the raw materials are unloaded after detection results are obtained, so that manpower and material resources are wasted, and the operation of the whole system is also influenced, therefore, the rapid analysis of whether the calcium hydroxide content meets the technical index requirements is very important.

Disclosure of Invention

The reagent and the method for rapidly judging whether the calcium hydroxide is qualified or not can rapidly judge whether the calcium hydroxide desulfurizer is qualified or not within 15 minutes so as to reduce the influence on a desulfurization system.

On one hand, the method for rapidly judging whether the content of calcium hydroxide is qualified is characterized by comprising the following steps:

adding a calcium hydroxide desulfurizer sample to be detected into a determination reagent and stirring;

after standing, observing whether the color of the solution changes; wherein:

the determination reagent comprises sucrose, distilled water, hydrochloric acid and phenolphthalein indicator.

In a second aspect, a determination reagent for rapidly determining whether or not a calcium hydroxide content is acceptable, the determination reagent comprising: sucrose, distilled water, hydrochloric acid and phenolphthalein indicator.

Preferably, the concentration of the sucrose solution is 30%; the concentration of the hydrochloric acid solution is 1.00 mol/l.

Preferably, the volume ratio of the determination reagent is:

30% sucrose solution: distilled water: 1.00mol/l hydrochloric acid solution: the volume ratio of the phenolphthalein indicator is 50.0: 11.5: phenolphthalein indicator was at least 3 drops (burette titration).

Preferably, the determination reagent is used for determining that the calcium hydroxide content is greater than or equal to 85%.

In a third aspect, a method for preparing a determination reagent for rapidly determining whether the calcium hydroxide content is acceptable comprises the following steps:

weighing 50 parts by volume of the sucrose solution with the concentration of 30%;

adding 50 parts by volume of distilled water into the sucrose solution;

accurately adding 11.50 parts by volume of the 1.00mol/l HCl solution;

adding at least 3 drops of the phenolphthalein indicator (titrating by a burette), uniformly mixing, sealing, refrigerating and storing.

Preferably, the refrigeration preservation temperature is 0-8 ℃.

In a fourth aspect, a method for rapidly determining whether the content of calcium hydroxide is qualified comprises the following steps:

pouring the prepared determination reagent for rapidly determining whether the calcium hydroxide content is qualified into a conical flask;

adding a calcium hydroxide desulfurizer sample to be detected into a conical flask, stirring, and standing;

when the solution is pink after standing, the content of calcium hydroxide is more than or equal to 85 percent, and the index is qualified; if the color is not clear, the index is not qualified.

Preferably, wherein the stirring time is at least 15 minutes.

The technical effects of the invention are mainly reflected in that:

1. the reagent is convenient to prepare and high in analysis speed, and results can be obtained only in 15 minutes;

2. the use is simple. The reagent is different from pink and colorless in the process of detecting calcium hydroxide, the color is almost not changed gradually, and whether the content of the calcium hydroxide is qualified or not can be judged only according to the color;

3. the requirement on the professional level of an analyst is low, and the operation can be carried out without professional staff.

Drawings

FIG. 1 is a schematic flow chart of a method for rapidly determining whether the content of calcium hydroxide is acceptable according to an embodiment of the present invention

Detailed Description

The technical solution of the present invention is further described in detail by the following examples.

Fig. 1 is a schematic flow chart of a method for rapidly determining whether the content of calcium hydroxide is acceptable according to an embodiment of the present invention. As shown, the method includes steps S101-S105:

step S101: preparing a judgment reagent: the determination reagent is prepared by mixing sucrose, hydrochloric acid, distilled water and phenolphthalein indicator, and can rapidly determine whether the content of calcium hydroxide is qualified.

The preparation of the judgment reagent comprises the following steps:

measuring 50ml of sucrose solution with the concentration of 30%, wherein the solubility of calcium hydroxide in water is very low, and the sucrose solution is added to increase the solubility of calcium hydroxide in water; the concentration of the sucrose solution is 30% or more;

adding 50ml of distilled water into the sucrose solution;

accurately adding 11.50ml of 1.00mol/l HCl solution, wherein HCl is used as a titrant for acid-base reaction and is used for reacting with calcium hydroxide;

at least 3-4 drops of phenolphthalein indicator (burette titration) are added and mixed uniformly, the phenolphthalein indicator plays a role in color development in the embodiment, and the phenolphthalein indicator is prepared in a proper amount and is sealed at 5 ℃ for cold storage and standby.

111.5ml of the judgment reagent prepared in advance by the above preparation method and stored in a sealed and refrigerated manner may be measured and stored at a temperature of 5 ℃.

Step S102: sampling a calcium hydroxide desulfurizer: 0.5g +/-0.005 g of calcium hydroxide desulfurizer to be detected is taken.

Step S103: adding a sample into a judgment reagent: the determination reagent is added into the 0.5g +/-0.005 g calcium hydroxide desulfurizer sample.

Step S104: stirring and standing: stirring for 15 minutes by a magnetic stirrer, and standing to fully dissolve the calcium hydroxide desulfurizer sample.

Step S105: observing the color of the solution: after standing, observing whether the color of the solution changes, and when the color of the solution changes into pink, indicating that the content of calcium hydroxide in the solution is greater than or equal to 85 percent and the index is qualified; and if the calcium hydroxide is colorless, the calcium hydroxide content index is unqualified.

The determination reagent is convenient to prepare, the determination reagent is different from pink and colorless in the process of detecting the calcium hydroxide desulfurizer, the color is almost free of a gradual change process, whether the content of the calcium hydroxide is qualified or not can be determined only according to the color, the use is simple, the analysis speed is high, and the result can be obtained only in 15 minutes.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.