Method for producing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials

A technology of calcium carbide waste residue and carbon dioxide, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of difficult to guarantee the permanent storage of carbon dioxide, reduce the investment of fixed assets and operating costs, enhance the operability of industrialization, and improve the carbonization reaction rate. Effect

Inactive Publication Date: 2011-02-09
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] Capturing carbon dioxide is not the goal. Only permanent storage of carbon dioxide can achieve the purpose of reducing greenhouse gas emissions. However, the methods currently being researched and developed, such as entering the seabed, are difficult to ensure permanent storage of carbon dioxide. Harmful and even useful solids are efficient way to store carbon dioxide

Method used

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  • Method for producing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials
  • Method for producing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials
  • Method for producing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials

Examples

Experimental program
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Embodiment 1

[0043] The calcium carbide waste slag with a water content of less than 30% is fed into the rotary indirect heat exchange dryer at a feed rate of 300kg / h, and is indirect heat exchange with the flue gas from the calciner. The time is 25 minutes, and the moisture content in the solid calcium carbide residue out of the drier is less than 5%. Then, the solid powder of calcium carbide waste slag was sent into a rotary calciner, the calcining temperature was 800° C., and the calcining time was 40 minutes. The heat source for calcination is high-temperature air coal-fired flue gas, and the method of indirect heating is adopted. The temperature of the flue gas exiting the calciner is higher than 200°C, which is used as a heat source in the drying section. After the calcined solid material is cooled, it enters the rotary sealed hot water digester, and the carbonized filtrate obtained by filtering after carbonization is used as part of the digested water, and the digestion reaction ti...

Embodiment 2

[0046] The calcium carbide waste slag with a water content of less than 30% is fed into the rotary indirect heat exchange dryer at a feed rate of 300kg / h, and the indirect heat exchange is performed with the flue gas from the calciner. The operating temperature is 150°C. The time is 30 minutes, and the moisture content in the solid calcium carbide residue out of the drier is less than 5%. Then, the solid powder of calcium carbide waste slag enters the rotary calciner, the calcining temperature is 1000° C., and the calcining time is 30 minutes. The heat source for calcination is natural gas and air combustion gas, and the method of direct contact heating is adopted. The temperature of the flue gas exiting the calciner is higher than 200°C, which is used as a heat source in the drying section. After the calcined solid material is cooled, it enters the rotary sealed hot water digester, and the carbonized filtrate obtained by filtering after carbonization is used as part of the d...

Embodiment 3

[0049] The calcium carbide waste slag with a water content of less than 30% is fed into the rotary indirect heat exchange dryer at a feed rate of 300kg / h, and is indirectly exchanged with the flue gas from the calciner. The operating temperature is 130°C. The time is 40 minutes, and the moisture content in the solid calcium carbide residue out of the drier is less than 5%. Then, the solid powder of calcium carbide waste slag was sent into a rotary calciner, the calcining temperature was 700° C., and the calcining time was 50 minutes. The heat source for calcination is high-temperature air coal-fired flue gas, and the method of indirect heating is adopted. The temperature of the flue gas exiting the calciner is higher than 200°C, which is used as a heat source in the drying section. After the calcined solid material is cooled, it enters the rotary sealed hot water digester, and the carbonized filtrate obtained by filtering after carbonization is used as part of the digested wa...

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Abstract

The invention provides a method for preparing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials, which comprises: calcining, digesting and refining calcium carbide slag to obtain calcium hydroxide suspension; and performing the carbonation of the calcium hydroxide suspension and a flue gas or kiln gas, which is purified by desulfuration, dedusting and the like and contains 5 to 15 volume percent of carbon dioxide, under a pressurized condition in a carbonizer to produce light calcium carbonate or nano calcium carbonate. In the invention, a technique for producing calcium carbonate series products by suing calcium carbide slag as raw materials is combined with a technique for recovering carbon dioxide from gas in a coal-burning flue, so the low concentration carbon dioxide in the flue gas is captured, solidified, sealed and stored while the high-added value calcium carbonate products; and thus, the treatment of waste by waste and change of waste into resources are realized.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for producing calcium carbonate by using calcium carbide waste slag and waste gas containing low-concentration carbon dioxide as raw materials. Background technique [0002] Calcium carbide is an important chemical raw material in the chemical industry, and is widely used in the production of PVC and dissolved acetylene, welding, cutting metal, etc. According to statistics, the current annual output of calcium carbide in the country reaches 20 million tons. Calculated by calculating 1.2 tons of waste residue for every ton of calcium carbide consumed, the annual production of calcium carbide waste residue reaches 24 million tons. [0003] The main component of calcium carbide waste slag is calcium hydroxide. Using calcium carbide waste slag as raw material, it can produce light calcium carbonate or nano calcium carbonate with high added value after certain imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 刘润静胡永琪胡庆福
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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