CN1299820C - Low-cost deodorizing desiccant and its preparing method - Google Patents

Abstract

The invention provides a low-cost deodorizing desiccant, the composition ratio of which is (weight ratio): fly ash is 45-75%, gypsum is calculated as _CaSO 18-53%, lime is 2-7% range. According to needs, you can also add 0.1‰-0.4‰ activator of the total amount of deodorizing desiccant, the composition is: CaO 67-70%, MgO 10-12%, Al ₂ O ₃ 2-5%, SiO ₂ 10- 15%, _{Fe2O3 0.12-0.3} %, _K2O 0.2-2.5%. In addition, the activator may also contain other calcium salts, carbon-containing organic substances, and the like. The present invention is characterized in that the raw materials are mixed according to the above ratio, and 30-45 parts of water are added for every 100 parts of the mixture (dry weight). 30mm column, and then dried into the product.

Description

Low-cost deodorizing desiccant and its preparation method

technical field

The invention relates to a deodorant desiccant and its preparation method, in particular to a low-cost and effective deodorant desiccant made by mixing fly ash with wide sources and low price and appropriate amount of gypsum and lime. its preparation method.

Background technique

Desiccants are widely used in daily life, industrial production and scientific research, such as silica gel, anhydrous calcium chloride, concentrated sulfuric acid, etc. are commonly used desiccants. In daily life, deodorants also have a large number of applications, such as deodorization of refrigerators, deodorization of animal breeding rooms, deodorization of pets such as cats and dogs, and other deodorization aspects. At present, the common deodorant desiccants in the market are mostly activated carbon products, and the production process is cumbersome, and the production cost is often high. Patent search found that someone applied for "Deodorant and its preparation method, and deodorizing method" (96190047.4). It is formed on a carrier substrate with active carbon as the main component, especially, the composition ratio of copper oxide, manganese oxide and silver nitrate: copper oxide, calculated as CuO, is 0.5 to 10 parts by weight, manganese oxide, calculated as MnO#-[2 ] is 1 to 20 parts by weight, silver nitrate is 1 to 20 parts by weight according to AgNO#-[3], and the total content of copper oxide, manganese oxide and silver nitrate in the deodorant is 3 to 30 weight percent . There is also a "chemical moisture-absorbing desiccant and its preparation method" (94111758.8), in which there are CaO, K#-[2]O, Na#-[2]O, Na#-[2]SiO#-[ 3], SiO#-[2], Ca(OH)#-[2], MgO, of which CaO is the main material and the rest are auxiliary materials, and the high-purity CaCO#-[3] ore with more than 95% is used in the preparation. After high-temperature calcination, it is selected and crushed into irregular polygonal particles, and sprayed with a spray slurry prepared from auxiliary materials.

On the other hand, my country is a coal producing and consuming country in the world. According to statistics, coal accounts for 75% of the total primary energy consumption, especially in coal-fired power plants and large boiler plants, which produce a large amount of by-product fly ash. The rate is very low, resulting in a great waste of resources. The invention aims to make full use of cheap fly ash, mix appropriate gypsum, lime and activator to make low-cost deodorizing desiccant.

Contents of the invention

The invention mainly solves the technical problems that common deodorant desiccants have high requirements on raw materials, cumbersome production process, and high production cost.

The present invention solves the problems of the technologies described above by the following scheme: the composition ratio of the components in the low-cost deodorizing desiccant is (weight ratio):

Fly Ash 40-80%

Gypsum (according to CaSO ₄ ) 13-58%

Lime 2-7%

In addition, add the activator with the total amount of 0.1‰-0.4‰ of the first three mixtures. The components of the activator are inorganic substances such as CaO, MgO, Al ₂ O ₃ , SiO ₂ and trace amounts of carbon-containing organic substances.

Generally speaking, the composition of the activator is: CaO 67-70%, MgO 10-12%, Al ₂ O ₃ 2-5%, SiO ₂ 10-15%, Fe ₂ O ₃ 0.12-0.3%, K ₂ O 0.2-2.5%. The activator is a non-toxic and harmless cheap mineral.

The present invention is characterized in that it is formed by mixing fly ash, gypsum (calculated as CaSO ₄ ) or fly ash and lime with gypsum components in a certain proportion, wherein the fly ash with gypsum components is calculated as CaSO ₄ After the gypsum component, the rest is counted as fly ash. The invention does not need carrier substrates such as activated carbon, and is particularly convenient to manufacture. Using this deodorizing desiccant can effectively absorb the odor of pets such as refrigerators, animal breeding rooms, cats and dogs, and keep their spaces dry.

In order to bring into play the effect of above-mentioned coal ash, gypsum, lime and activator more effectively, preferably its component ratio is set as: fly ash is 45-75 weight parts, and gypsum is calculated as CaSO _18-53 Parts by weight, lime is in the range of 2-7 parts by weight. If it exceeds this range, the respective effects are insufficient to sufficiently absorb odor, and it is difficult to achieve a satisfactory deodorizing drying effect. The ingredients used in the present invention must contain the above three ingredients. According to the needs, an appropriate amount of activator can also be added, but the dosage should be limited to 0.1‰ of the total amount of the deodorant desiccant without diluting the above three ingredients. -0.4‰, preferably about 0.25‰ of the total amount.

The present invention is characterized in that the raw materials are mixed according to the above ratio, and 30-45 parts of water are added for every 100 parts of the mixture (dry weight). 30mm column, and then dried into the product.

The invention can also directly utilize the dry flue gas desulfurization end product of the coal-fired power plant. The power plant uses fly ash as the main component of the desulfurizer, using the fly ash produced by the power plant, adding a certain proportion of lime and used ash, mixing with water, kneading, granulation, and steam activation (100-150 ℃ ), dry to make desulfurizer, the desulfurizer particles directly through the desulfurization absorber and SO ₂ in the flue gas directly undergo physical absorption and chemical reaction, and finally get the dry flue gas desulfurization end product, except for a part of which is returned as the raw material of the desulfurizer, the rest is a large amount The terminal product of dry flue gas desulfurization, according to the need, add a total amount of 0.1‰-0.4‰ activator, and after molding and packaging, it becomes the deodorizing desiccant of the present invention.

The deodorizing effect of the low-cost deodorant desiccant of the present invention is equivalent to that of activated carbon products currently sold in the market, but the processing cost will be much lower, and the processing technology is also very simple. At the same time, the chemical deodorization function is further strengthened. This product can be the terminal product of dry flue gas desulfurization in coal-fired power plants, or it can be obtained by processing fly ash, and after use, this product can be recycled as soil for flower and tree cultivation or farmland improver to increase fertility and improve soil structure. That is, the low-cost deodorant desiccant of the present invention has secondary commercial value.

Detailed ways

The technical solutions of the present invention will be further specifically described below through examples.

Embodiment: referring to the following table 1, configure respectively by 7 ratios listed in the table, make the product of the present invention, under the same conditions, in the same time, measure its deodorizing and drying effect respectively, the result is as follows:

Table 1: Content (Wt%) of each component in the deodorant desiccant fly ash plaster lime activator Implementation Effect Example 1 40 58 2 0.03 generally Example 2 45 53 2 0.02 generally Example 3 55 42 3 generally Example 4 65 30 5 0.04 good Example 5 70 27 3 0.025 good Example 6 75 19 6 better Example 7 80 13 7 0.03 generally

Wherein the composition of activator is according to table 2 proportioning,

Table 2: Content (Wt%) of each composition in the activator serial number CaO MgO Al ₂ O ₃ SiO _{2 Fe2O3 _} K ₂ O 1 67 12 4 14.2 0.3 2.5 2 68 11 5 13.8 0.2. 2 3 68 11 5 14.8 0.2 1 4 69 10 4 14.7 0.1 2.2 5 69 10 4 15 0.12 1.88 6 70 12 3 13 0.2 1.8

In addition, the activator may also contain other calcium salts, carbon-containing organic substances, and the like.

Claims (5)

1, a kind of low-cost deodorant drier, its component and content are by weight:

Flyash 40-80%

Gypsum is pressed CaSO ₄Meter 13-58%

Lime 2-7%.

2, low-cost deodorant drier according to claim 1, its component and content are by weight:

Flyash 45-75%

Gypsum is pressed CaSO ₄Meter 18-53%

Lime 2-7%.

3, low-cost deodorant drier according to claim 1 and 2 is characterized in that also containing in the described drier activator of 0.1-0.4 ‰ by weight, and wherein the composition of activator is CaO, MgO, Al ₂O ₃, SiO ₂The carbonaceous organic material of inorganic matter and trace.

4, low-cost deodorant drier according to claim 3, the composition that it is characterized in that described activator are CaO 67-70%, MgO 10-12%, Al by weight ₂O ₃2-5%, SiO ₂10-15%, Fe ₂O ₃0.12-0.3%, K ₂O 0.2-2.5%.

5, a kind of production method of low-cost deodorant drier, tie up to and add 30-45 part water in per 100 parts of claims 1 or the 2 or 4 described arbitrary mixtures, after mixing, making diameter through make-up machine is that 3-10mm, length are the column of 5-30mm, and drying is made again.