New technique for preparing sodium hydroxide

A technology of soda ash and liquid caustic soda, which is applied in the direction of alkali metal compounds, alkali metal hydroxides, alkali metal oxides/hydroxides, etc., and can solve the problems of limited consumption of carbide slag, unknown market prospects, and small consumption. Achieve the effect of reducing entrainment of raw materials and products, improving mass transfer and washing effect, and improving washing effect

Inactive Publication Date: 2007-12-26
北京清华紫光英力化工技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Using calcium carbide slag as a desulfurizer, its consumption is still too small at present; using calcium carbide slag to produce wall materials such as hollow bricks, due to the low added value of this technical product, the market prospect is unknown, and the amount of calcium carbide slag consumed in actual operation is limited; The use of calcium carbide slag to produce cement is mainly based on the "wet grinding and dry burning" method.

Method used

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  • New technique for preparing sodium hydroxide

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Effect test

Embodiment 1

[0031] Preparation of Caustic Soda and Light Calcium Carbonate from Carbide Slag and Sodium Bicarbonate by Causticizing Reaction

[0032] Add 1.0L of water to the reaction flask, then add 500g of sodium bicarbonate, mix and stir, and heat to above 95°C, keep warm for about 0.5h to dissolve the material. Then add 480g of calcium carbide slag (wherein calcium hydroxide content is 88%) and continue to insulate and stir at 95°C. During the process, samples are taken to detect the concentration of caustic soda, and the incubating time is about 4 hours to end. While hot, it was centrifuged, purged and filtered to obtain 1040 g of caustic soda solution with a NaOH content of 20.6%, a yield of 95%, and a sodium carbonate content of 0.7%. After the filter residue was washed, it was dried and pulverized to obtain a total of 630 g of light calcium carbonate with a fineness greater than 400 mesh.

Embodiment 2

[0034] Preparation of Caustic Soda and Light Calcium Carbonate by Causticizing Reaction of Carbide Slag and Sodium Carbonate

[0035] Add 0.5L of water to the reaction flask, add 250g of sodium carbonate in portions, mix and stir, and heat to above 95°C, keep warm for about 0.5h to dissolve the material. Then add 190g of calcium carbide slag (wherein the calcium hydroxide content is 88%) in stages and continue to insulate and stir at 95°C. During the process, samples are taken to detect the concentration of caustic soda, and the incubating time is about 4 hours to end. While hot, it was centrifuged, purged and filtered to obtain 823g of caustic soda solution with a NaOH content of 21%, a yield of 95%, and a sodium carbonate content of 0.8%. After the filter residue was washed, it was dried and pulverized to obtain a total of 250 g of light calcium carbonate with a fineness greater than 400 mesh.

Embodiment 3

[0037] Using sodium chloride and ammonium bicarbonate as raw materials to prepare sodium bicarbonate first, then add quantitative calcium carbide slag to prepare caustic soda and light calcium carbonate through causticization reaction

[0038] Dissolve 360g of sodium chloride in 1000g of water at a temperature of 60°C, stir and dissolve until clear. After filtering to remove impurities, the filtrate was cooled to 35°C, 480g of ammonium bicarbonate was added, and kept stirring for 40 minutes, a large amount of precipitation appeared, the temperature was lowered to 25°C, and 500g of sodium bicarbonate solid was obtained by filtration. Add sodium chloride 350g in the filtrate, separate out the ammonium chloride crystal, after filtering, the filtrate is circulated and used to make sodium bicarbonate.

[0039] Add 1.0L of water into the reaction flask, then add 500g of sodium bicarbonate obtained in the above process, mix and stir, heat to above 95°C, and keep warm for about 0.5h t...

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Abstract

This invention discloses a method for preparing caustic soda and light calcium carbonate with wide industrial applications by reacting carbide slag as a substitute for slaked lime with sodium carbonate or sodium bicarbonate. The method can well address the problems of utilizing causticization method and treating carbide slag. The method is environmentally friendly, and has good social and economic benefits.

Description

[0001] Technology area [0002] The present invention proposes a new approach for the effective utilization of calcium carbide slag, and discovers that calcium carbide slag can replace lime and react with sodium carbonate or sodium bicarbonate to prepare high-concentration caustic soda. The process and engineering of the causticization process have been innovated. Background technique [0003] Calcium carbide slag is the waste residue after calcium carbide is hydrolyzed to produce acetylene gas, which contains a large amount of calcium oxide and a small amount of silicon, iron, aluminum, calcium, magnesium and carbon slag. Correlative analysis and research have found that the content of free water in calcium carbide slag is 35.60%; the combined water, ferric oxide, aluminum oxide, calcium oxide, magnesium oxide, titanium dioxide, silicon dioxide, The carbon slag contents were 19.95%, 2.27%, 2.39%, 65.49%, 0.77%, 0.40%, 4.28%, 2.14%, respectively. [0004] Acetylene is used a...

Claims

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Application Information

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IPC IPC(8): C01D1/22C01D1/04C01F11/18
Inventor 谢增勇冯天瀚尹应武明扬静陈启宏雷洪赵丹郑长春冯倩
Owner 北京清华紫光英力化工技术有限责任公司
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