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Production process for refining secondary brine by replacing sun-dried sea salt with well and rock salt

A secondary brine and production process technology, applied in the chlor-alkali industry, can solve the problems of aluminum ions and other impurities exceeding the standard, and achieve the effects of reducing the amount of solid waste salt mud, reducing the salt consumption per ton of alkali, and reducing the opening frequency

Active Publication Date: 2018-12-14
DEZHOU SHIHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the production process using sun-dried sea salt as raw material is directly replaced by well mine salt, there will be problems such as silicon dioxide and aluminum ions in the secondary brine entering the ion membrane exceeding the standard.

Method used

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  • Production process for refining secondary brine by replacing sun-dried sea salt with well and rock salt
  • Production process for refining secondary brine by replacing sun-dried sea salt with well and rock salt
  • Production process for refining secondary brine by replacing sun-dried sea salt with well and rock salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] After fully using well mine salt instead of sun-dried sea salt, the Si content in the secondary brine is 10-20ppm, Al 3+ Content 120~160ppb, Si content and Al 3+ content exceeded the standard.

Embodiment 2

[0044] When 10% sea salt is mixed into well mine salt, Si content in secondary brine is 5-12ppm, Al 3+ Content 55~120ppb, Al 3+ The content exceeds the standard.

Embodiment 3

[0046] When the amount of sea salt mixed in well mine salt reaches 25%, Si content in secondary brine is less than 2.3ppm, Al 3+ Content3+ The content does not exceed the standard.

[0047] After using well mine salt instead of sea salt, the cleaning of the salt pond was extended from the original semi-annual cleaning to every two years, and the salt consumption per ton of alkali was greatly reduced, from 1.6t salt / ton alkali (folded) to 1.51t salt / ton alkali (100 percent); consumption of auxiliary materials FeCl 3 Reduced from 0.3t / ton of alkali (reduced to 100) to 0.05t / ton of alkali (reduced to 100%; consumption of auxiliary material NaOH was reduced from 30kg / ton of alkali (reduced to 100%) to 20kg / ton of alkali (reduced to 100%), consumption of auxiliary material NaCO 3 Reduced from 9kg / ton of alkali (100%) to 6kg / ton of alkali (100%); the frequency of opening the denitrification system was reduced, and the operation was from 8000h / year to 2900h / year; the amount of solid...

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Abstract

The invention discloses a production process for refining secondary brine by replacing sun-dried sea salt with well and rock salt. The production process for refining secondary brine with sun-dried sea salt uses the sea salt and the well and rock salt as raw material salts, wherein the raw material salts contain not less than 25% by mass of sea salt; the content of the well and rock salt in the raw material salts is not zero. The production process provided by the invention can replace the sea salt with the well and rock salt to improve production capacity and reduce cost.

Description

technical field [0001] The invention belongs to the chlor-alkali industry, and in particular relates to a production process for refining secondary brine with well mine salt instead of sun-dried sea salt. Background technique [0002] The raw salt of the chlor-alkali industry generally uses well mine salt or sea salt as the raw material for primary brine, and a small number of enterprises use lake salt according to geographical conditions. Because the salt content of well mine salt is higher than that of sun-dried sea salt, and the impurities such as calcium and magnesium ions, sulfate radicals, and heavy metal ions are lower than that of sun-dried refined salt, but the price is higher, so each company chooses different raw salts based on cost-benefit calculations . However, mine salt and sea salt have slightly different processes in the primary brine refining process. At present, domestically, sun-dried sea salt is mainly used as raw material for primary brine. [0003] ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/30C02F101/12C02F101/10
CPCC02F1/42C02F1/44C02F1/461C02F1/66C02F1/76C02F9/00C02F2101/10C02F2101/12C02F2101/30
Inventor 王保贵侯守慧王月成
Owner DEZHOU SHIHUA CHEM
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