Green and environment-friendly white carbon black and caustic soda circulation combined production method
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A green and environmental-friendly, joint production technology, applied in the direction of silica, chlorine/hydrogen chloride, electrolysis process, etc., can solve the problems of high production cost, backwardness, large water consumption, etc., and achieve simple production equipment, increase economic value, and stable quality Effect
Active Publication Date: 2019-04-26
江西双龙硅材料科技有限公司
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The traditional precipitation method mainly uses water glass and acid as raw materials to produce silica. It is a white, non-toxic, amorphous powder with the characteristics of porosity, light weight, chemical stability and good electrical insulation. It is mainly used as a reinforcing agent for rubber. At present, the technology of domestic production of white carbon black is relatively backward. The treatment of saline wastewater (sodium sulfate) mainly relies on multi-effect evaporation, and the cost is about 40 yuan per ton of wastewater. The production cost is high and the water consumption is high. larger
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Embodiment 1
[0047] (1) Add 600L to the 1000L reactor with a concentration of 1.21~1.22g / cm 3 , a sodium silicate solution with a modulus of 3.3, heat up to 85°C, stir at a rate of 80 rpm, then add hydrochloric acid with a concentration of 15%, adjust the pH value to 10.5, put in the remaining sodium silicate solution within 60 minutes and continue to add Hydrochloric acid, adjust the pH value to 5.5, heat preservation and aging for 30 minutes to obtain a suspension containing silica precipitation, and the suspension is subjected to solid-liquid separation by a filter press to obtain silica precipitation filter cake and sodium chloride solution;
[0048] (2) the silica precipitated filter cake is washed and pulped, dried, pulverized and packaged to obtain 1# product white carbon black;
[0049] (3) described sodium chloride solution obtains mass concentration as 12% sodium chloride solution and a large amount of pure water through RO membrane treatment twice, and described pure water retur...
Embodiment 2
[0054] Steps (1)-(5) are the same as above,
[0055] (6) In a 5L pressure vessel, add 1kg of 200-mesh quartz sand, add 0.7kg of sodium hydroxide solution with a mass concentration of 20%, heat up to 143°C, pressurize to 0.4Mpa, and react for three hours to obtain 3# product Sodium silicate solution;
Embodiment 3
[0057] Steps (1)-(5) are the same as above,
[0058] (6) In a 5L pressure vessel, add 1kg of 200 mesh quartz sand, add 0.7kg of sodium hydroxide solution with a mass concentration of 20%, heat up to 143°C, pressurize to 0.4Mpa, react for three hours, and constantly shake the pressure vessel , make 4# product sodium silicate solution;
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Abstract
The invention discloses a green and environment-friendly white carbon black and caustic soda circulation combined production method. The method comprises the following steps: (1), performing a reaction on sodium silicate and hydrochloric acid to obtain a silica precipitation filter cake and a sodium chloride solution; (2), washing and slurrying the silica precipitation filter cake, and performingdrying, crushing and packaging to obtain a finished white carbon black product; (3), treating the sodium chloride solution by an RO membrane twice to obtain a sodium chloride solution with concentration of 12%; (4), performing multi-effect evaporation purification on the sodium chloride solution with concentration of 12% to obtain a sodium chloride solution with concentration of 36%; (5), electrolyzing the sodium chloride solution with concentration of 36% to obtain sodium hydroxide, hydrogen and chlorine, and illuminating hydrogen and chlorine to obtain hydrochloric acid; (6), adding quartz sand to sodium hydroxide for a reaction to generate sodium silicate; (7), adding hydrochloric acid to sodium silicate to prepare white carbon black again. By combined production and recycling, zero emission of water can be basically realized, production cost and environmental protection cost are greatly reduced, and the method is a good method for industrial production of the white carbon black.
Description
technical field [0001] The invention relates to the field of white carbon black preparation, in particular to a green and environment-friendly white carbon black and caustic soda cycle combined production method. Background technique [0002] Precipitated silica is an inorganic material with a wide range of applications. Mainly used in rubber, silicone rubber, tires, sole materials, polyester materials, papermaking and other fields. The traditional precipitation method mainly uses water glass and acid as raw materials to produce silica. It is a white, non-toxic, amorphous powder with the characteristics of porosity, light weight, chemical stability and good electrical insulation. It is mainly used as a reinforcing agent for rubber. At present, the technology for producing white carbon black in China is relatively backward. The treatment of saline wastewater (sodium sulfate) mainly relies on multi-effect evaporation, and the cost is about 40 yuan per ton of wastewater. The p...
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