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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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[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 ...

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...

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 t...

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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.

Description

technical field [0001] The invention relates to a method for synthesizing superfine calcium carbonate by utilizing carbide slag. Background technique [0002] Carbide slag is a by-product of the chlor-alkali industry using calcium carbide to produce acetylene gas, and it is an industrial waste. 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. [0003] With the rapid growth of the global economy and the sharp rise in energy consumption, the "greenhouse gas" CO 2 The rate of emission increases rapidly with the increase of people's utilization of energy, leading to global warming. The combustion of fossil fuels in the cement industry and the calc...

Claims

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Application Information

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IPC IPC(8): C01F11/18B09B3/00
Inventor 蔡玉良冯冬梅汤升亮俞刚肖国先吴德厚
Owner SINOMA INT ENG
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