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Method for reducing content of silicon dioxide in chlor-alkali primary brine

A silica and brine technology, which is applied in material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc. The problem of rising costs, etc., to achieve the effect of reducing the cost of solid waste treatment, low addition of magnesium chloride, and low operating costs

Pending Publication Date: 2021-10-22
常州新东化工发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the conventional brine refining process cannot remove the silica in the brine. Moreover, the brine of many enterprises is a closed circuit cycle. Such an operation mode will lead to the enrichment of silica in the system, resulting in The concentration is getting higher and higher
[0005] Although silicon dioxide is a minor impurity in brine, under the synergistic effect of calcium and aluminum, silicon dioxide will form calcium silicate or aluminum silicate precipitation during the electrolysis process, which will deposit on the surface of the ion membrane, causing physical damage to the membrane. Sexual damage, resulting in a decrease in the current efficiency of the ionic membrane and an increase in the voltage of the electrolytic cell, resulting in a substantial increase in operating costs and a reduction in the service life of the ionic membrane

Method used

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  • Method for reducing content of silicon dioxide in chlor-alkali primary brine

Examples

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Effect test

Embodiment 1

[0047] This embodiment is used to illustrate the method for reducing the silicon dioxide content in chlor-alkali primary brine of the present invention.

[0048] Take the saturated brine of the chemical salt tank of the chlor-alkali plant, and use the aforementioned method to measure the concentration of silicon dioxide to be 26.73 mg / L;

[0049] Take 1000mL of saturated brine from the chemical salt tank of the above-mentioned chlor-alkali device, adjust the pH value to 9.0, put the brine in a water bath at 30°C, add a magnetic stirrer to the brine, and keep stirring. After the temperature of the brine reaches 30°C, add 100g / L magnesium chloride Solution 3.0mL, then add 6.0mL of 100g / L sodium carbonate solution, start timing, after 20 minutes, centrifuge the brine at a speed of 10000rpm and take the supernatant to measure the concentration of silicon dioxide. The silicon dioxide concentration measured by the aforementioned method was 23.36 mg / L, and the single-pass silicon dioxi...

Embodiment 2

[0051] This embodiment is used to illustrate the method for reducing the silicon dioxide content in chlor-alkali primary brine of the present invention.

[0052] Take 1000mL of the same saturated brine as in Example 1, adjust the pH value to 11.6, put the brine in a water bath at 50°C, add a magnetic stirrer to the brine, and keep stirring. After the temperature of the brine reaches 50°C, add 100g / L magnesium chloride solution 6.0mL, then add 3.0mL of 100g / L sodium carbonate solution, and start timing. After 60 minutes, centrifuge the brine at a speed of 10000rpm and take the supernatant to measure the concentration of silicon dioxide. The concentration of silicon dioxide measured by the aforementioned method is 7.58mg / L, the calculated one-way silica removal rate is 71.6%.

Embodiment 3

[0054] This embodiment is used to illustrate the method for reducing the silicon dioxide content in chlor-alkali primary brine of the present invention.

[0055] Take 1000mL of the same saturated brine as in Example 1, adjust the pH value to 11.6, put the brine in a water bath at 70°C, add a magnetic stirrer to the brine, and keep stirring. After the temperature of the brine reaches 70°C, add 100g / L magnesium chloride solution 1.0mL, then add 3.0mL of 100g / L sodium carbonate solution, and start timing. After 30 minutes, filter the brine with a 0.22μm microporous membrane and take the filtrate to measure the concentration of silicon dioxide. The concentration of silicon dioxide measured by the above method is 14.31mg / L, the calculated one-way silica removal rate is 46.5%.

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Abstract

The invention relates to a method for reducing the content of silicon dioxide in chlor-alkali primary brine, and belongs to the technical field of chlor-alkali chemical industry. The method comprises the following steps: adjusting the pH value of the brine, adding a magnesium chloride solution, adding a sodium carbonate solution, stirring for a certain time at a proper temperature, and filtering to remove the generated precipitate, thereby obtaining the primary brine meeting the requirements of an ionic membrane process. The method for reducing the content of silicon dioxide in the chlorine-alkali primary brine is simple in process, and does not need to change an original chlorine-alkali brine treatment device; and only a magnesium chloride solution adding facility needs to be additionally arranged on the original device; compared with a sea salt method, the salty mud amount can be reduced by 80%-90%, and the solid waste treatment cost is greatly reduced; the method is high in applicability and suitable for saline water with various silicon dioxide concentrations; the operation cost is low and the magnesium chloride addition amount is low.

Description

technical field [0001] The invention relates to a method for reducing silicon dioxide content in chlor-alkali primary brine, which belongs to the technical field of chlor-alkali chemical industry. Background technique [0002] Silicon dioxide is an inorganic substance with the chemical formula SiO 2 , which has various forms of crystalline and amorphous forms. The common crystalline silicas are quartz, phosphoquartz or cristobalite, all of which have low solubility in water, the solubility is only a few parts per million, and the dissolution rate is extremely slow. Compared with crystalline state, amorphous silicon dioxide has higher solubility in water, and the solubility in pure water can reach 100-110ppm. The dissolution process of silica is not based on SiO 2 The molecular form dissolves in water, but combines with water to dissolve in water in the form of monosilicate [Si(OH)4]. In the alkaline solution with pH>10, the monosilicic acid is transformed into HSiO-3 ...

Claims

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Application Information

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IPC IPC(8): G01N21/82
CPCG01N21/82
Inventor 董亮陶文平陶春平徐湘越潘婷赵晓龙
Owner 常州新东化工发展有限公司
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