Process for producing calcium carbonate by absorbing carbon dioxide with ardealite decompose slag

A carbon dioxide, phosphogypsum technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems such as patents for inventions that have not yet been seen, and achieve the effect of protecting the ecological environment, reducing CO2 emissions, and realizing circular economy.

Inactive Publication Date: 2009-01-07
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] So far, there have been no reports of invention patents, research literature, etc. that use p

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  • Process for producing calcium carbonate by absorbing carbon dioxide with ardealite decompose slag

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Grind the phosphogypsum and anthracite finely, pass the phosphogypsum through a standard sieve with a hole diameter of 0.037mm, and pass through the standard sieve to separate the anthracite according to different particle sizes, and mix the coal and phosphogypsum with a particle size of 0.037mm according to the C / S molar ratio = 0.75 Evenly, put it into the decomposition furnace whose temperature has been raised to 850°C, and continue to raise the temperature so that the time for the material temperature to rise to 1000°C is less than 15s. Medium SO 2 The reaction ends when the volume percentage reaches 15%-17%, containing SO 2 The flue gas is used for sulfuric acid production through the gas collection system, and the solid slag is naturally cooled to obtain the composition expressed in wt.%, mainly: CaO 55%-65%, CaS 12%-20%, SiO 2 8%-12%, Al 2 o 3 0.1%-0.3%, Fe 2 o 3 0.07%-0.12%, MgO 0.02%-0.05%, total phosphorus (existing as solid eutectic phosphorus) 0.3-0.6...

Embodiment 2

[0022] Grind phosphogypsum and high-sulfur coal finely, pass the phosphogypsum through a standard sampling sieve with an aperture of 0.037mm, and take 0.037mm coal through a standard sieve, then mix the coal and phosphogypsum according to the C / S molar ratio = 0.9, and put it in the temperature In the reaction furnace that has been raised to 950°C, the time for raising the temperature of the material to 1100°C is less than 15s. After achieving rapid temperature rise, it is calcined at 1100°C. 2 The reaction ends when the volume percentage reaches 15%-17%, containing SO 2 The flue gas is used for sulfuric acid production through the gas collection system, and the solid slag is naturally cooled, and its composition is expressed in wt.%, mainly: CaO: 50%-65%, CaS: 16%-22%, SiO 2 : 8%-12%, Al 2 o 3 : 0.1%-0.3%, Fe 2 o 3 : 0.07%-0.12%, MgO: 0.02%-0.05%, total phosphorus (existing as solid eutectic phosphorus): 0.2-0.6% phosphogypsum decomposition slag.

example 1

[0024] The phosphogypsum decomposition slag prepared in Example 1, the composition is mainly expressed in wt.%: CaO 55%-65%, CaS12%-20%, SiO 2 8%-12%, Al 2 o 3 0.1%-0.3%, Fe 2 o 3 0.07%-0.12%, MgO 0.02%-0.05%, total phosphorus (existing as solid eutectic phosphorus): 0.3%-0.6%. It is placed in a fixed-bed carbonization tower with a height:diameter ratio of 8:1 and a packing factor of 0.7. After humidification, the CO 2 (wt.% of water content is 1-15%) at a gas velocity of 1.6-2.5m / s, solid volume m 3 The ratio of number to gas volume L is kept at 4.5L / m 3 In between, the carbonization reaction is carried out at a temperature of 30 ° C to obtain a CaCO 3 84wt.% product, the yield is 93%.

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Abstract

The invention relates to a method for producing calcium carbonate by using phosphogypsum decomposition slag to absorb carbon dioxide, and provides a process for synthesizing calcium carbonate through comprehensive utilization of phosphogypsum and CO2 gas resources. The method comprises the steps of decomposing mixed phosphogypsum and coal at the temperature of 950-1200 DEG C to generate a gas which is used as sulfur to produce a feed gas; placing solid slag in a carbonizer after colling; introducing CO2 into the carbonizer for reaction under normal pressure and at the temperature of 25-80 DEG C to obtain similar strong argillo calcareous limestone with 75%-85% of CaCo3; further purifying to obtain a high purity calcium carbonate product; or directly using the similar argillo calcareous limestone as building material. Aiming at the solid waste of phosphogypsum in phosphoric acid manufacture industries, the comprehensive utilization of industrial resources in coal-fired power plants, ammonium phosphate production, etc. which has large emission of CO2, the method not only solves the pollution problem of the solid waste of phosphogypsum and recycles sulfur resources, but also recycles carbon resources and reduces CO2 emission in combination with the problem of large emission of CO2 in ammonium phosphate production in phosphoric acid industries.

Description

1. Technical field [0001] The invention relates to a technical method for producing calcium carbonate by using phosphogypsum decomposition slag to absorb carbon dioxide. The invention belongs to the field of comprehensive utilization of phosphogypsum, the solid waste of the phosphorus chemical industry. 2. Background technology [0002] Phosphogypsum is an industrial waste residue produced in the process of phosphoric acid production, and its components are mainly expressed in wt.%: CaO27-30; SO 3总 37-42; SiO 2 8-12; Al 2 o 3 0.1-0.3; Fe 2 o 3 0.07-0.12; MgO 0.02-0.05; P 2 o 5 总 0.8-1.4; F 总 0.2-0.6; crystal water 14-18. Pile of phosphogypsum occupies a large amount of land, after being soaked by rainwater, the soluble P 2 o 5 Harmful components such as fluoride and fluoride diffuse and infiltrate into the surrounding environment through the water body, causing serious pollution to soil, water, and the atmosphere. In May 2006, the State Environmental Protection A...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 马丽萍宁平
Owner KUNMING UNIV OF SCI & TECH
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