Method for preparing white carbon black from diatomite in situ

A technology for in-situ preparation and diatomaceous material, applied in the chemical industry, can solve problems such as complex purification procedures, and achieve the effects of shallow burial, simple process, and easy open mining.

Active Publication Date: 2013-08-21
SICHUAN HONGHUI TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Diatomaceous earth can be used to produce silica, but it needs to go through a complicated purification process

Method used

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  • Method for preparing white carbon black from diatomite in situ
  • Method for preparing white carbon black from diatomite in situ

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preparation example Construction

[0021] a. Preparation of sodium silicate glass liquid: pulverize diatomaceous clay, add sodium hydroxide and water to stir and boil for reaction, then cool, age and filter to obtain sodium silicate glass liquid;

[0022] B, the preparation of white carbon black mixed solution: add a small amount of sodium sulfate to mix and stir in sodium silicate glass liquid, then carry out precipitation to sodium silicate glass liquid with sulfuric acid solution and make white carbon black mixed liquid;

[0023] c. Preparation of white carbon black: heat the white carbon black mixture for aging treatment, then wash, filter, and dry to obtain the white carbon black product.

[0024] The present invention directly utilizes the diatomite clay to prepare the white carbon black in situ process, which can reduce the process of purifying the diatomite clay specially, and the process is simple. The produced silica is of good quality, from figure 1 It can be seen that silica contains less impuritie...

Embodiment 1

[0031] Diatomaceous clay (containing SiO by weight 2 59.07%, Fe 3 o 36.32%, Al 2 o 3 15.01%) 10g was crushed to about 65 mesh, with diatomaceous clay: NaOH: water = 10g: 6g: 100g, stirred evenly, boiled for 1.5h; cooled and aged at room temperature for 1h to form a sodium silicate glass liquid with a modulus of 0.76 ; Use a vacuum pump to filter and separate the non-alkali-soluble solid and sodium silicate glass liquid. The conditions are: speed: 1400rad / min, 120W, ultimate pressure: 6Pa, pumping speed 1-1.1L / s, about: 5-6min; Add 1g of sodium sulfate to every 100ml of sodium silicate glass liquid, mix and stir, use 2mol / L sulfuric acid solution to precipitate the sodium silicate glass liquid, at a temperature of 75°C, a speed of 600 rad / min, for about 2 hours, and titrate to pH Stop acid dripping at 6.5, and carry out aging treatment for 20min at the temperature of 85°C to the prepared white carbon black mixture; put it into a 1000ml beaker and add 1000ml water to wash th...

Embodiment 2

[0033] Diatomaceous clay (containing SiO by weight 2 59.07%, Fe 2 o 3 6.32%, Al 2 o 3 14.86%) 10g was crushed to about 70 mesh, with diatomaceous clay: NaOH: water = 10g: 6g: 100g, stirred evenly, boiled for 1.5h; cooled and aged at room temperature for 1h to form a sodium silicate glass liquid with a modulus of 0.75 ; Use a vacuum pump to filter and separate the non-alkali-soluble solid and sodium silicate glass liquid. The conditions are: speed: 1400rad / min, 120W, ultimate pressure: 6Pa, pumping speed 1-1.1L / s, about: 5-6min; Add 1g of sodium sulfate to every 100ml of sodium silicate glass liquid, mix and stir, use 2mol / L sulfuric acid solution to precipitate the sodium silicate glass liquid, at a temperature of 70°C, a speed of 600 rad / min, for about 2 hours, and titrate to pH Stop acid dripping at 6.5, and carry out aging treatment for 15 minutes at the temperature of 90°C to the prepared white carbon black mixture; put it into a 1000ml beaker and add 1000ml of water t...

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Abstract

The invention discloses a method for preparing white carbon black from diatomite in situ, and belongs to the field of chemical industry. The ore is not required to be purified according to the method. The method comprises the following steps of: (a) preparing sodium silicate glass liquid, namely grinding the diatomite, adding sodium hydroxide and water, stirring, boiling for reaction, cooling, ageing, and filtering to obtain the sodium silicate glass liquid; (b) preparing white carbon black mixed liquid, namely adding a small amount of sodium sulfate into the sodium silicate glass liquid, mixing, stirring, and precipitating the sodium silicate glass liquid by using a sulfuric acid solution to obtain the white carbon black mixed liquid; and (c) preparing the white carbon black, namely heating the white carbon black mixed liquid for ageing, washing, filtering, and drying to obtain the white carbon black. The white carbon black is directly prepared from the diatomite, silicon dioxide is separated from impurities through alkaline thermal reaction, the ore is not required to be further purified, and the process is simple.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing white carbon black in situ with diatomaceous clay. Background technique [0002] Diatomaceous earth is a kind of biogenic siliceous sedimentary rock, mainly composed of ancient diatom remains, and its chemical composition is mainly SiO 2 , containing a small amount of Al 2 o 3 , Fe 2 o 3 , CaO, MgO, K 2 O, Na 2 O.P 2 o 5 and organic matter. SiO 2 Usually more than 80%, up to 94%. The iron oxide content of high-quality diatomite is generally 1-1.5%, and the alumina content is 3-6%. The mineral composition of diatomite is mainly opal and its variants, followed by clay minerals - hydromica, kaolinite and mineral debris. Mineral debris includes quartz, feldspar, biotite and organic matter. The content of organic matter ranges from a small amount to more than 30%. [0003] Diatomite is mainly distributed in China, the United S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
Inventor 陈南春王文辉王荣贵
Owner SICHUAN HONGHUI TECH
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