Method for coproducing white carbon black and sodium sulfate from waste sulfuric acid and bentonite alkaline extraction waste liquid rich in christobalite

A technology of white carbon black and bentonite, applied in the direction of alkali metal sulfite/sulfite, chemical instruments and methods, alkali metal compounds, etc., can solve the problem of low utilization rate of sulfuric acid, to avoid the precipitation of sodium sulfate crystals, Avoid the formation of gel, the effect of high economic efficiency

Inactive Publication Date: 2012-02-15
INNER MONGOLIA UNIVERSITY
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Problems solved by technology

However, in many production processes, the utilization rate of sulfuric acid is very low, resulting in a large amount of waste sulfuric acid

Method used

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  • Method for coproducing white carbon black and sodium sulfate from waste sulfuric acid and bentonite alkaline extraction waste liquid rich in christobalite
  • Method for coproducing white carbon black and sodium sulfate from waste sulfuric acid and bentonite alkaline extraction waste liquid rich in christobalite
  • Method for coproducing white carbon black and sodium sulfate from waste sulfuric acid and bentonite alkaline extraction waste liquid rich in christobalite

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Experimental program
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Effect test

Embodiment 1

[0030]Collect the waste liquid obtained after alkali extraction and separation of cristobalite-rich bentonite by collecting dilute alkali solution. After measuring the waste liquid Baume degree=6°Bé, modulus SiO 2 / Na 2 O=1.1. Add precipitant waste sulfuric acid in above-mentioned waste liquid and react, waste sulfuric acid concentration is 20% (mass fraction), sulfuric acid solution add-on is 100ml / L, reaction temperature is controlled at 70 ℃, reaction time 1 hour, obtains amorphous white carbon Black precipitates, obtains white carbon black product after filtering, washing, drying, and the white carbon black product purity of making > 99% (see X-ray diffractogram figure 2 , see the infrared spectrum image 3 ), the DBP oil absorption value is 2.6ml / g, and the specific surface area is 240m 2 / g, the average particle size of the particles is 450nm. The determination of DBP oil absorption value is based on "Determination of Absorption Value of Dibutyl Phthalate Precipitat...

Embodiment 2

[0032] The reaction raw materials, conditions and other corresponding test methods are the same as in Example 1.

[0033] Collect the filtrate that obtains after the white carbon black precipitation filtration in embodiment 1, filtrate obtains sodium sulfate product after evaporation concentration, crystallization, filtration, oven dry, and the sodium sulfate purity of making > 99.5% (X-ray diffraction spectrum and sodium sulfate For a comparison of X-ray diffraction standard patterns, see Figure 4 ).

Embodiment 3

[0035] As a comparison, the present embodiment selects a commercially available sodium silicate solution (measured sodium silicate solution Baume degree=34 ° B é, modulus SiO 2 / Na 2 (0=3.5) and waste sulfuric acid solution (mass fraction is 20%) prepare precipitated white carbon black, reaction conditions and other corresponding test methods are identical with embodiment 1, and the white carbon black product purity of making Figure 5 ), a small amount of sodium sulfate crystals are obviously mixed in the white carbon black product.

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Abstract

The invention provides a resource utilization method for inorganic wastes. The treatment of waste sulfuric acid and depth processing of bentonite rich in christobalite are combined in a circular economy approach; a characteristic of easiness to conducting a precipitation reaction with sulfuric acid of the bentonite alkaline extraction waste liquid (with a main component of a sodium silicate dilute solution) rich in christobalite is fully utilized to prepare white carbon black through a precipitation reaction, and a mother liquor obtained from the precipitation reaction is further utilized to prepare sodium sulfate. The technology of the invention is easy, practical and with high economic benefits, solves an environmental pollution problem caused by waste sulfuric acid and bentonite alkaline extraction waste liquid rich in christobalite and also produces two products of white carbon black and sodium sulfate with excellent product performances, wherein a white carbon black purity is higher than 99%, and a sodium sulfate purity is higher than 99.5%. The invention realizes waste resource exploitation and utilization with high efficiency, low costs and high added value.

Description

technical field [0001] The invention belongs to the resource utilization technology of inorganic waste. It is mainly suitable for co-producing white carbon black and sodium sulfate with waste liquid obtained in the process of separation and purification of waste sulfuric acid and cristobalite-rich bentonite by alkaline method, so as to realize the purpose of turning waste into treasure and clean production. Background technique [0002] Bentonite is a non-metallic clay mineral mainly composed of montmorillonite, so it is also called montmorillonite. Bentonite has good expansibility, adhesiveness, adsorption, thixotropy, plasticity, lubricity, and cation exchange properties. It is one of the clay minerals with a wide range of applications and high economic value. It has been widely used Used in metallurgy, machinery, petroleum, chemical industry, medicine, environmental governance and other fields, it is called "clay with a thousand uses". [0003] The predicted resources o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01D5/00
Inventor 苏海全张兵兵贾永雷葛永强王亚明
Owner INNER MONGOLIA UNIVERSITY
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