Method for synthesizing ultrafine calcium carbonate by utilizing carbide slag

A technology of ultra-fine calcium carbonate and carbide slag, which is applied to the removal of calcium carbonate/strontium/barium and solid waste, and can solve the problems of interface defects between base materials and fillers, insufficient utilization, and low calcium carbonate yield, and achieve Increase affinity and compatibility, highlight social and economic benefits, and improve resource utilization

Active Publication Date: 2012-07-25
SINOMA INT ENG +1
7 Cites 35 Cited by

AI-Extracted Technical Summary

Problems solved by technology

According to survey statistics, my country produces nearly 40 million tons of calcium carbide slag every year, and its utilization rate is less than 30%. Except for a small amount of cement, it is generally disposed of in landfill, which not only occupies a large area of ​​land, but also alkalizes the land, which is harmful to the air. and water sources causing secondary pollution
Although this patent utilizes waste slag and exhaust gas to prepare calcium carbonate, the process is complicated, more equipment is needed, and the content of carbon dioxide is low, and th...
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Abstract

The invention relates to a method for synthesizing ultrafine calcium carbonate by utilizing carbide slag. The method comprises the following steps of: (1) dissolving carbide slag: uniformly mixing carbide slag with water in a ratio of (1:6)-(1:20) to ensure that the carbide slag is fully dissolved into a turbid liquid, wherein the water content of the carbide slag is 20-45%; (2) carrying out impregnation reaction: adding ammonium chloride into the turbid liquid of the carbide slag for uniformly mixing, wherein the mass ratio of carbide slag to ammonium chloride is (1:0.7)-(1:2.5), after the impregnation reaction is finished, filtering and removing the slag to obtain a clear calcium chloride solution; and (3) carrying out carbonization reaction: adding a crystal form control agent into a calcium chloride solution for fully dissolving, introducing CO2 into the solution to carry out carbonization reaction till the pH (potential of Hydrogen) value of the reaction solution is less than or equal to 7 to obtain ultrafine calcium carbonate slurry, wherein the crystal form control agent is one or more than two mixtures of sulfate, chloride, citrate, sodium dodecyl benzene sulfonate, pyrophosphate, oleic acid, ammonium citrate, N-methyl pyrrolidone and maleic acid.

Application Domain

Technology Topic

Water contentCis-Butenedioic Acid +20

Image

  • Method for synthesizing ultrafine calcium carbonate by utilizing carbide slag
  • Method for synthesizing ultrafine calcium carbonate by utilizing carbide slag

Examples

  • Experimental program(4)

Example Embodiment

[0024] Example 1
[0025] Mix the calcium carbide slag with a water content of 35% and water in a mass ratio of 1:10 to make the calcium carbide slag fully dissolve into a suspension. In the suspension of the calcium carbide slag, add ammonium chloride to fully react and control the solution The pH value is greater than or equal to 7, the mass ratio of calcium carbide slag and ammonium chloride is 1:0.78, after removing the residue, add the crystal shape control agent N-methylpyrrolidone and sodium dodecylbenzene sulfonate (the mass ratio is 1:1 ), control the addition of the crystal form control agent to 1% of the weight of calcium carbonate produced by the carbonization reaction, and then pass it into the purified CO 2 Gas (CO 2 The volume percentage of the cement plant kiln exhaust gas or power plant flue gas is carbonized, and the temperature of the carbonization reaction is controlled at 10-25°C until the pH value of the solution is less than or equal to 7. The fine calcium carbonate slurry is subjected to liquid-phase surface activation treatment, the activation temperature is 80°C, the activation time is 2 hours, the activator is sodium stearate, and the addition amount is 2% of the weight of calcium carbonate produced by the carbonization reaction. After dehydration, washing, and drying Light calcium carbonate powder can be obtained, the conversion rate of calcium carbide slag is 72%, and the test results of calcium carbonate products show that the crystal form is spherical calcium carbonate, the average particle size of single particles is 60-80nm, the content of calcium oxide obtained is 53.2%, and the specific surface area is 35m. 2 /g, oil absorption value 30DOP/100CaCO 3 , Other properties meet the requirements of the industrial ultrafine activated calcium carbonate (HG/T2776-1996) standard.

Example Embodiment

[0026] Example 2
[0027] Mix the calcium carbide slag with a water content of 35% and water in a mass ratio of 1:10 to make the calcium carbide slag fully dissolve into a suspension. In the suspension of the calcium carbide slag, add ammonium chloride to fully react and control the solution The pH value is greater than or equal to 7, the mass ratio of calcium carbide slag and ammonium chloride is 1:0.78, after removing the residue, add the crystal shape control agent N-methylpyrrolidone and sodium dodecylbenzene sulfonate (the mass ratio is 1:1 ), control the addition of the crystal form control agent to 1% of the weight of calcium carbonate produced by the carbonization reaction, and then pass it into the purified CO 2 Gas (CO 2 The volume percentage is 30%) of cement plant kiln tail gas or power plant flue gas for carbonization, and the reaction temperature is controlled at 10-25 ℃, until the pH value of the solution is less than or equal to 7, the ultrafine after carbonization reaction The calcium carbonate slurry is subjected to liquid-phase surface activation treatment, the activation temperature is 50°C, the activation time is 2 hours, the activator is sodium stearate, and the amount added is 1% of the weight of calcium carbonate formed by the carbonization reaction, and it can be dehydrated, washed, and dried. Obtained light calcium carbonate powder, the conversion rate of calcium carbide slag is 72%, the test result of calcium carbonate product shows that the crystal form is chain calcium carbonate, the average particle size of single particles is 70-90nm, the content of calcium oxide obtained is 52%, and the specific surface area is 28m 2 /g, oil absorption value 32DOP/100CaCO 3 , Other properties meet the requirements of the industrial ultrafine activated calcium carbonate (HG/T2776-1996) standard.

Example Embodiment

[0028] Example 3
[0029] The calcium carbide slag with a water content of 35% and water are mixed uniformly in a mass ratio of 1:9 to fully dissolve the calcium carbide slag into a suspension. In the suspension of the calcium carbide slag, add ammonium chloride to fully react and control the solution The pH value is greater than or equal to 7, the mass ratio of calcium carbide slag and ammonium chloride is 1:0.78, after removing the residue, add the crystal shape control agent potassium pyrophosphate and sodium dodecylbenzene sulfonate (the mass ratio is 2:1), The addition amount of the control crystal form control agent is 1% of the weight of calcium carbonate produced by the carbonization reaction, and then it is passed into the purified and contains CO 2 Gas (CO 2 The volume percentage is 30%) of cement plant kiln tail gas or power plant flue gas for carbonization, and the reaction temperature is controlled at 10-25 ℃, until the pH value of the solution is less than or equal to 7, the ultrafine after carbonization reaction The calcium carbonate slurry is subjected to liquid-phase surface activation treatment, the activation temperature is 70°C, the activation time is 2 hours, the activator is water-soluble silane coupling agent CG-151 (Jiangsu Chenguang Coupling Agent Co., Ltd.), and the amount of activator added is carbonization reaction To generate 1% of calcium carbonate by weight, the activator is first formulated into an aqueous solution with a concentration of 5% and then added. After dehydration, washing, and drying, light calcium carbonate powder can be obtained. The calcium carbonate slag conversion rate is 75%. The calcium carbonate product test result It shows that the crystal form is chain calcium carbonate, the average particle size of single particles is 50-80nm, the content of calcium oxide obtained is 54.3%, and the specific surface area is 25m. 2 /g, oil absorption value 25DOP/100CaCO 3 , Other properties meet the requirements of the industrial ultrafine activated calcium carbonate (HG/T2776-1996) standard.
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PUM

PropertyMeasurementUnit
The average particle size0.0nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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