Process for producing nano titanium dioxide/diatomite composite photocatalytic material

A technology of nano-titanium dioxide and composite photocatalysis, which is applied in the direction of physical/chemical process catalysts, chemical/physical processes, catalyst activation/preparation, etc., can solve the problems of unsatisfactory advanced treatment of exhaust gas and the inability to completely remove harmful substances, etc., and achieve improvement Photocatalytic performance, ideal effect, and the effect of simplifying the preparation process

Active Publication Date: 2010-08-18

临江市宝健纳米复合材料科技有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems existing in the above-mentioned traditional technology, through hard exploration and research, using natural diatomite as raw material, after purifying and dredging pores, using titanium tetrachloride as titanium source, and adopting hydrolysis precipitation method, a kind of The p...

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Method used

Wet acid leaching: concentration is 72% sulfuric acid 1680kg, diatomite 420kg after above-mentioned sorting drops in reactor, carries out wet chemical purification with sulfuric acid, further removes the acid-soluble impurity in diatom shell, Dredge...

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Abstract

The invention relates to a process for producing a nano titanium dioxide/diatomite composite photocatalytic material. The process comprises the following steps: purifying a diatomite raw material by using grading and acid-washing processes; synthesizing nano titanium dioxide/diatomite composite particles by adopting a hydrolysis-precipitation method through the purified diatomite serving as a carrier, titanium tetrachloride serving as a precursor and hydrochloric acid, ammonium sulfate and ammonium carbonate serving as aids; and filtering, washing, drying and burning the composite particles to form a finished product. The process can thoroughly remove harmful substances, has quite ideal effect on deep treatment of waste gas, lowers the cost and improves the photocatalytic performance.

Application Domain

Other chemical processesCatalyst activation/preparation

Technology Topic

Ammonium sulfateTitanium tetrachloride +10

Image

Examples

Experimental program(5)
Effect test(1)

Example Embodiment

[0024] Example 1

[0025] Purification of refined diatomaceous earth from raw ore includes the following steps:

[0026] Dry the diatomite ore to a moisture content of 0-2%, and use an airflow turbine separator to sort and remove sand to remove grit and impurities with a particle size> 43μm, and then calcinate with a rotary kiln to remove organic matter. The calcining temperature is 500 ℃, heat preservation calcination time 90min

[0027] Wet acid leaching: Put 1680kg of sulfuric acid with a concentration of 72% and 420kg of diatomaceous earth after the above sorting into the reactor, and use sulfuric acid for wet chemical purification to further remove the acid-soluble impurities in the diatom shell and dredge the diatom The pores of the body increase the specific surface area of the diatomaceous earth. When the temperature of the reactor reaches 100°C, the reaction is kept for 4 hours; after the reaction is kept for 4 hours, 1600L of water is injected, and the reaction is kept for 1 hour;

[0028] Filtration and washing: Pour the purified solution in the above reaction kettle into the washing tank, and then add 4000 kg of washing water to the washing tank for filtering and washing;

[0029] Refined diatomaceous earth, with a water content of 55%;

[0030] The production process of nano-titanium dioxide/diatomite composite photocatalytic material includes the following steps:

[0031] Pulping: Pour 1200L of water into the reaction kettle; 6.16L of 36% hydrochloric acid solution, adjust to pH 2~3 of the aqueous solution, add 61.64kg of refined diatomaceous earth filter cake with 55% water content, stir for 10min to prepare silica Algae earth suspension;

[0032] Hydrolysis precipitation: when the temperature drops to 0~5℃, add 123.28L of titanium tetrachloride solution with a concentration of 200g/L, the feeding speed is 12.328L/min, and continue to stir for 10min after the addition;

[0033] Add 308.2L ammonium sulfate solution with a concentration of 200g/L and 30.82L hydrochloric acid solution with a concentration of 36% at a speed of 25L/min and a time of 15min. After the addition, continue to stir and react for 5min;

[0034] After the system is heated to 30℃, the temperature is kept and stirred for 60min;

[0035] Add ammonium carbonate solution with a concentration of 200g/L at a speed of 6.2L/min, and stop adding when the pH of the solution reaches 4 to 5. After the addition is complete, stir and react for 60 minutes;

[0036] Filtration and washing: Because the load reaction product contains more Cl -1 , SO4 -2 Equal acid radical ions must be washed. Therefore, in order to reduce the moisture content of the filter cake as much as possible, the filter and washing process of box-type filter press and filter cake separate washing is adopted. The slurry is pumped into the filter press with an acid-resistant pump, and 2600L of water is added. Carry out filtering and washing, and the filter cake is repeatedly washed and filtered through the washing tank until the filtrate does not detect chloride ions;

[0037] Drying: Put the above-mentioned filtered and washed solution into a dryer for drying at a drying temperature of 335°C; outlet temperature of 100°C; material moisture before drying 55%; material moisture after drying 3%;

[0038] Break up: send the dried materials to the breaker for breaking up;

[0039] Calcining: send the scattered materials into a calcining kiln for calcination. The heating rate of the calcining kiln is 3℃/min, and the temperature is kept at 650℃ for 7 hours;

[0040] Product packaging: When the calcined material is cooled to room temperature in a high-temperature furnace, immediately use a packaging machine to pack the plastic sealed bag, and then send the product to the product warehouse after packaging.

Example Embodiment

[0041] Example 2

[0042] In the pulping step, mixing in parts by weight refined diatomaceous earth: a 36% concentration of hydrochloric acid solution: water = 308.2:30:6000;

[0043] In the hydrolysis and precipitation step, the hydrolysis is carried out at the ratio of weight parts of titanium tetrachloride with a concentration of 200g/L: ammonium sulfate with a concentration of 200g/L: ammonium carbonate with a concentration of 200g/L=339:308.2:308.2 Precipitation reaction

[0044] In the filtering and washing step, filtering and washing are performed in a ratio of parts by weight of refined diatomaceous earth: water = 308.2:13000;

[0045] In the drying step, the drying temperature is 300°C, and the drying is stopped when the water content reaches 0-6%;

[0046] In the calcination step, the calcination time is 6 hours, and the calcination temperature is 620°C;

[0047] The other steps are the same as in Example 1.

Example Embodiment

[0048] Example 3

[0049] In the said pulping step, after mixing in parts by weight refined diatomaceous earth: 36% hydrochloric acid solution: water = 260:12:5000, stirring for 7 minutes;

[0050] In the hydrolysis and precipitation step, the hydrolysis is carried out at the ratio of weight parts of titanium tetrachloride with a concentration of 200g/L: ammonium sulfate with a concentration of 200g/L: ammonium carbonate with a concentration of 200g/L=280:240:240 Precipitation reaction

[0051] In the filtering and washing step, filtering and washing are performed according to the ratio of parts by weight of refined diatomaceous earth: water = 260:10000;

[0052] In the drying step, the drying temperature is 280°C;

[0053] In the calcination step, the calcination time is 3 hours, and the calcination temperature is 700°C;

[0054] The other steps are the same as in Example 1.

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PUM

Property	Measurement	Unit
Particle size	>= 43.0	µm
Specific surface area	20.0	m²/g
Granularity	<= 45.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

The preparation process is simple
Good effect

Nano-paste, self-cleaning coating liquid and thermal insulating coating liquid as well as transparent substrates and preparation methods thereof

ActiveCN104059420AThe preparation process is simpleWide range of applicationsPolyurea/polyurethane coatingsThermal insulationParticle-size distribution

Owner:张扬 +2

Process for producing nano titanium dioxide/diatomite composite photocatalytic material

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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