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Process for preparing precipitated white carbon black by adopting carbon dioxide for decomposition

A precipitation method of white carbon black and carbon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of low recovery value of sodium sulfate solution, difficulty in recycling and environmental pollution, etc., and achieve uniform particles, good filtration performance, and smelting. Simple process effect

Active Publication Date: 2012-10-31
KUNMING METALLURGY INST
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  • Description
  • Claims
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Problems solved by technology

During acid precipitation, on the one hand, the precipitated metasilicate particles are fine and difficult to filter; on the other hand, the precipitated liquid is a solution such as sodium sulfate. The recovery value of sodium sulfate solution is low, difficult to recycle, and causes certain environmental pollution.

Method used

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  • Process for preparing precipitated white carbon black by adopting carbon dioxide for decomposition

Examples

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Embodiment 1

[0014] Example 1 1. The aluminum content in industrial sodium metasilicate is 0.50g / l, the iron content is 0.60g / l, and the titanium content is 0.07g / l. The sodium metasilicate is first neutralized and decontaminated, and filtered to obtain an industrial sodium metasilicate solution with a pH of 12.5-13.5.

[0015] Pass carbon dioxide gas into the obtained industrial sodium metasilicate solution, the solution temperature during ventilation is 50~55°C, the carbon dioxide concentration is 10~15%, and the flow rate is 20~25m 3 / h; when the pH of the sodium metasilicate solution drops to 8.5~9.0, stop feeding carbon dioxide gas, continue to stir for 30min~40min, stop stirring, and filter. The filter residue is metasilicate, and the filtrate is a solution containing sodium carbonate. Put metasilicate into 4 m 3 Add pure water according to the liquid-solid mass ratio of 6:1, raise the temperature to 50~65°C, stir and wash for 30min, and filter. After filtering, rinse with pure ...

Embodiment 2

[0018] Example 2 1. The aluminum content in industrial sodium metasilicate is 0.65g / l, the iron content is 0.72g / l, and the titanium content is 0.043g / l. The sodium metasilicate is first neutralized and decontaminated, and filtered to obtain an industrial sodium metasilicate solution with a pH of 12.5-13.5.

[0019] Infuse carbon dioxide gas into the obtained industrial sodium metasilicate solution, the temperature of the solution is 60~65°C, the concentration of carbon dioxide is 15~20%, and the flow rate is 15~20m 3 / h; when the pH of the sodium metasilicate solution drops to 8.5~9.0, stop feeding carbon dioxide gas, continue to stir for 30min~40min, stop stirring, and filter. The filter residue is metasilicate, and the filtrate is a solution containing sodium carbonate. Put metasilicate into 4 m 3 Add pure water to the mixing tank according to the liquid-solid mass ratio of 6:1, raise the temperature to 55~60°C, stir and wash for 30min, and filter. After filtering, rin...

Embodiment 3

[0022] Example 3 1. The aluminum content in the industrial sodium metasilicate solution is 0.35g / l, the iron content is 0.56g / l, and the titanium content is 0.04g / l. The sodium metasilicate is first neutralized and decontaminated, and filtered to obtain a sodium metasilicate solution with a pH of 12.5-13.5.

[0023] Pass carbon dioxide gas into the obtained industrial sodium metasilicate solution, the solution temperature during ventilation is 55~60°C, the carbon dioxide concentration is 20~25%, and the flow rate is 10~15m 3 / h; when the pH of the sodium metasilicate solution drops to 8.5~9.0, stop feeding carbon dioxide gas, continue to stir for 30min~40min, stop stirring, and filter. The filter residue is metasilicate, and the filtrate is a solution containing sodium carbonate. Put metasilicate into 4 m 3 Add pure water according to the liquid-solid ratio of 6:1, raise the temperature to 50~55℃, stir and wash for 30min, and filter. After filtering, rinse with pure water...

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Abstract

The invention relates to a process for preparing precipitated white carbon black by adopting carbon dioxide for decomposition. The process comprises the following steps: introducing the precipitator carbon dioxide into industrial sodium metasilicate solution with the pH value of 12.5-13.5 to react, stopping introducing the carbon dioxide when the pH value of the solution is 8.5-9.0, filtering thereactant to obtain metasilicic acid filter residues and filtrate containing sodium carbonate; adding water to metasilicic acid according to the liquid solid mass ratio of 6:1, stirring and washing the mixture, filtering the mixture and then washing entrained sodium carbonate solution, and drying the product to obtain the precipitated white carbon black; and returning one half of the filtrate containing sodium carbonate to the sodium metasilicate solution to be dissolved again to precipitate the metasilicic acid and concentrating and crystallizing the other half of the filtrate to obtain sodium carbonate product. The process has the following advantages: the carbon dioxide is adopted to replace the acid to precipitate the metasilicic acid in the sodium metasilicate solution, thus solving the filtering performance of the precipitate metasilicic acid in the traditional precipitation process; meanwhile, the liquid after precipitation is ensured to be the sodium carbonate solution with high additional value, thus completely eliminating discharge of waste water in the precipitation process; and besides, carbon is utilized.

Description

technical field [0001] The invention belongs to the process of preparing precipitation white carbon black from industrial sodium metasilicate solution through carbon dioxide decomposition. Background technique [0002] The annual production and consumption of precipitated white carbon black in my country is more than 700,000 tons, but the traditional precipitated white carbon black mainly adopts the acid precipitation method, and the metasilicate obtained through precipitation is dehydrated to form white carbon black. During acid precipitation, on the one hand, the precipitated metasilicate particles are fine and difficult to filter; on the other hand, the precipitated liquid is a solution such as sodium sulfate. The recovery value of sodium sulfate solution is low, difficult to recycle, and causes certain environmental pollution. Therefore, it is of great significance to research and develop a sodium salt with suitable particle size of precipitated metasilicate, easy to fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
Inventor 杨大锦李怀仁和晓才
Owner KUNMING METALLURGY INST
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