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Method for preparing nano white carbon black from coal gangue

A technology of nano white carbon black and coal gangue, which is applied in the field of coal chemical industry, can solve the problems of high production cost and expensive raw materials of nano white carbon black process, and achieve the effect of reducing costs

Inactive Publication Date: 2012-10-03
韩钊武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of expensive raw materials and high production costs of the existing method for preparing nano-silica, improve the process of preparing white carbon black from coal gangue as a raw material in the prior art, and provide a gas-phase nano-silica with coal gangue as raw material. -A method for preparing nano-silica products by hydrolysis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put coal gangue into a muffle furnace and sinter at 750°C for 2 hours, then acid-leach 50g of 60-80 mesh coal gangue powder and 300g of 4mol / L nitric acid in an enamel reactor for 2 hours, and keep stirring during the acid-leaching process. After solid-liquid separation, the product was washed with distilled water at 60°C until neutral, and dried in a vacuum oven for 8 hours to obtain 22.5 g of silica solid. Add 10 g of sodium fluoride to the obtained solid and put it into an enamel reactor, heat it in an oil bath, and the temperature rises to 120° C., add 98% concentrated sulfuric acid dropwise at a constant temperature, and control the rate of addition, about 1 drop per second. The reaction produces a mixed gas, which is passed into concentrated sulfuric acid to dry, and then the gas is introduced into a 5g / L sodium dodecylsulfonate solution after drying. The hydrolysis temperature is controlled at 80°C, and continuously stirred with a magnetic stirrer, and ammonia wat...

Embodiment 2

[0019] Put coal gangue into a muffle furnace and sinter at 800°C for 3 hours, then pickle 60g of 60-80 mesh coal gangue powder and 500g of 4mol / L nitric acid in an enamel reactor for 2 hours, and keep stirring during the acid leaching process. After liquid separation, wash with 70°C distilled water until neutral, and dry the solid in a vacuum oven for 6 hours to obtain 28.5 g of silica solid. Add 13 g of sodium fluoride to the obtained solid and put it into an enamel reactor, and heat it in an oil bath. The temperature was raised to 150°C, 98% concentrated sulfuric acid was added dropwise, and the rate of addition was controlled, about 1 drop per second. The reaction produces a mixed gas, which is passed into concentrated sulfuric acid to dry, and then the dried gas is introduced into a 10g / L sodium dodecylsulfonate solution, and the hydrolysis temperature is controlled at 80°C, and continuously stirred with a magnetic stirrer, and ammonia water is added dropwise at the same ti...

Embodiment 3

[0021] Put coal gangue into a muffle furnace and sinter at 750°C for 2 hours, then acid-leach 50g of coal gangue powder of 60-80 mesh and 500g of 4mol / L nitric acid in an enamel reactor for 1 hour, and keep stirring during the acid-leaching process. After solid-liquid separation, wash and dry the solid in a vacuum oven for 8 hours to obtain 22.5 g of silica solid, add 10 g of sodium fluoride to the enamel reactor, heat it in an oil bath, and raise the temperature to 120 ℃, add 98% concentrated sulfuric acid dropwise, and control the rate of addition, about 1 drop per second. The reaction produces a mixed gas, the gas is passed into concentrated sulfuric acid to dry, and then the gas is introduced into a 15g / L sodium dodecylsulfonate solution after drying, the hydrolysis temperature is controlled at 70°C, and the magnetic stirrer is continuously stirred, and ammonia water is added dropwise at the same time. Keep the pH value of the solution at about 4 and hydrolyze for 3h. Put...

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Abstract

The invention relates to a method for preparing white carbon black from coal gangue, belongs to the technical field of coal chemical industry, and aims at overcoming the shortcomings of expensive raw materials and high production cost in the process for preparing nano white carbon black by using the traditional method. The method comprises the steps of: based on coal gangue as a raw material, carrying out high-temperature activation, nitric acid dissolution, burning and the like to extract silicon dioxide; corroding extracted silicon dioxide with hydrogen fluoride generated by reacting concentrated sulfuric acid and sodium fluoride so as to generate silicon tetrafluoride gas, reacting the silicon tetrafluoride gas with an aqueous solution with a surfactant dissolved to generate silicon gel, cleaning, drying and burning to remove water so as to produce the required nano white carbon black product. According to the method provided by the invention, the waste recycling of coal gangue is realized, and the cost for preparing nano white carbon black is lowered; and the particle size of the obtained product achieves a nano scale, and the indexes of the obtained product achieve the ministerial standard HG-1-125-64 or enterprise standard.

Description

technical field [0001] The invention relates to a method for preparing nano white carbon black from coal gangue, belonging to the technical field of coal chemical industry. Background technique [0002] Silica has the characteristics of small particle size, large specific surface area, and easy to form high-structure aggregates. It is mainly used as a reinforcing filler for rubber; it also has a wide range of applications in non-rubber fields, such as synthetic resins, plastics, and coatings. application. Nano silica has small particle size (less than 100nm), large specific surface area (generally greater than 100m 2 / g), high chemical purity, good dispersibility and other characteristics, with its superior stability, reinforcement, thickening and thixotropy, it has been widely used in many industrial fields such as rubber, coatings, medicine, papermaking, etc. The development of its related industrial fields provides a new material basis and technical guarantee, and nano-...

Claims

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Application Information

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IPC IPC(8): C01B33/12B09B3/00B82Y40/00
Inventor 韩钊武
Owner 韩钊武
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