Process for preparing light-weight calcium carbonate by recycling white mud by alkali

A technology of light calcium carbonate and white mud, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of non-standard whiteness and purity of light calcium carbonate, low whiteness of light calcium carbonate, incomplete purification of white mud, etc. problems, to achieve the effect of expanding product application range, improving whiteness, and improving causticizing rate of green liquor

Inactive Publication Date: 2012-09-05
山东华特达因健康股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main treatment technologies, one is based on physical methods, this technology does not purify the lime mud thoroughly, so that the whiteness and purity of the produced light calcium carbonate are not up to standard
The second is a technology based on chemical principles. This technology needs to add a variety of chemical agents, and the operating cost is relatively high.
[0007] Therefore, according to the present situation of low whiteness, unstable operation and single product of light calcium carbonate prepared in the current lime mud treatment process, it is of great significance to study new methods of lime mud treatment

Method used

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  • Process for preparing light-weight calcium carbonate by recycling white mud by alkali
  • Process for preparing light-weight calcium carbonate by recycling white mud by alkali
  • Process for preparing light-weight calcium carbonate by recycling white mud by alkali

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 8.7kg of quicklime with a calcium oxide content of 70%, add water and purifying agent EDTA, the amount of purifying agent added is 1 times the mass of iron in the lime, and the large particles of impurities in the milk of lime are removed by a digestion and slag extractor to obtain milk of lime with a mass concentration of 10% , and then through graded treatment, 5% of the total mass of lime milk (containing more impurities) is removed from the green liquor mixer to purify the green liquor, and the other part is separated from solid and liquid to prepare purified slaked lime.

[0034] Take 100L of green liquor with a sodium carbonate content of 110g / L and mix it with the milk of lime in the above-mentioned degreen liquor mixer, then add the purifying agent ATMP, the amount of purifying agent added is 3 times the mass of impurities in the green liquor, the reaction temperature is 60°C, keep stirring After 20 minutes, let it stand for clarification, and then fine filt...

Embodiment 2

[0043] Take 8.1kg of quicklime with a calcium oxide content of 75%, add water and purifying agent DTPA, the amount of purifying agent added is 5 times the mass of iron in the lime, and make milk of lime with a mass concentration of 20%. The large particles of impurities in the milk of lime are first removed, and then classified For treatment, 20% of the total mass of milk of lime (containing more impurities) is removed from the green liquor mixer to purify the green liquor, and the other part is separated from solid and liquid to prepare purified slaked lime.

[0044] Mix 100L of green liquor with a sodium carbonate content of 110g / L with the milk of lime in the above-mentioned degreen liquor mixer, then add the purifying agent EDTMP, the amount of purifying agent added is 6 times the mass of impurities in the green liquor, the reaction temperature is 80°C, keep stirring for 15min Finally, let it stand for clarification, and the upper part is cleared and then finely filtered th...

Embodiment 3

[0053] Take 7.6 kg of quicklime with a calcium oxide content of 80%, add water and purifying agent HEDTA, the amount of purifying agent added is 10 times the mass of iron in the lime, and make 30% lime milk. The large particles of impurities in the lime milk are first removed, and then through classification. 40% of the total mass of lime milk (containing more impurities) is removed from the green liquor mixer to purify the green liquor, and the other part is separated from solid and liquid to prepare purified slaked lime.

[0054] Mix 100L of green liquor with a sodium carbonate content of 110g / L with the milk of lime in the above-mentioned degreen liquor mixer, then add the purifying agent DTPA, the amount of purifying agent added is 10 times the mass of impurities in the green liquor, the reaction temperature is 90°C, keep stirring for 10min Finally, let it stand for clarification, and the supernatant liquid is finely filtered through a fine filter to obtain purified green l...

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Abstract

The invention relates to a process for preparing light-weight calcium carbonate by recycling white mud by alkali. The process comprises the following steps of: purifying lime by a wet method, thus obtaining lime slurry; putting part of the lime slurry into a green liquor mixer for purifying green liquor, performing solid and liquid separation on the other part of the lime slurry, thus obtaining purified slaked lime; stepping into a causticization working procedure; performing causticization reaction to obtain white mud with relatively high purity; refining the high-purity white mud; and dealkalizing, adjusting the pH and uniformly mixing. The conventional causticization workshop is technically improved; according to wet-method purification, green liquor impurity removal and green liquor purification on causticized white mud, the quality and the recycling rate of alkali can be improved, and a foundation is laid for the next step of refining the white mud, so that the white mud in the causticization workshop can be refined; and therefore, the requirement on papermaking and filling is met, and the quality of a product is improved.

Description

technical field [0001] The invention relates to a method and a device for recycling lime mud, in particular to a new process for preparing light calcium carbonate from alkali recovery lime mud. Background technique [0002] White mud is a by-product obtained from the causticization reaction in the pulping alkali recovery section, and its main component is calcium carbonate. Paper-making enterprises with conditions send lime mud to cement factories or brick factories to solve the outlet for some lime mud, while most enterprises still use foreign landfill to deal with lime mud. With the passage of time and the continuous expansion of pulping soda recovery scale, a large amount of caustic lime mud has been accumulated and landfilled randomly, which has put a huge pressure on environmental protection and wasted a lot of calcium carbonate resources. [0003] As early as the early 1990s, my country clearly stated that lime mud should be properly disposed of. As the country pays m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 孟庆海程燕姜延鹏黎明忠李林张斌王志法
Owner 山东华特达因健康股份有限公司
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