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Preparation method of mercury removing bromide

A kind of bromide, mercury removal technology, applied in the direction of bromide preparation, calcium/strontium/barium bromide, magnesium bromide, etc., can solve problems such as difficult to realize industrialization, difficult to operate, and reduce production costs and production energy consumption. , easy to achieve the effect of industrial production

Inactive Publication Date: 2018-03-09
自然资源部天津海水淡化与综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process is theoretically feasible, but it has technical problems such as the reaction between bromine vapor and milk of lime, which is difficult to operate, and it is difficult to realize industrialization

Method used

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  • Preparation method of mercury removing bromide

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Experimental program
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Effect test

Embodiment 1

[0027] According to the mass ratio of concentrated sulfuric acid and bromine of 1:1, add concentrated sulfuric acid and bromine-extracting enriched liquid to the still; after mixing uniformly, heat and distill the above-mentioned mixed liquid to obtain enriched and concentrated hydrobromic acid and distillation Mother liquor; calcium hydroxide in the concentrated hydrobromic acid, the amount of calcium hydroxide added is determined according to the amount of hydrogen bromide, the ratio of the amount of calcium hydroxide added to the amount of hydrogen bromide is 1 :1. After the stirring reaction is complete, an aqueous bromide solution for mercury removal can be obtained; the mother liquor of distillation is returned to the bromine extraction step for acidification of seawater and brine.

Embodiment 2

[0029] According to the mass ratio of concentrated sulfuric acid and bromine of 3:1, add concentrated sulfuric acid and bromine-extracting enriched liquid into the distillation kettle; after mixing uniformly, heat and distill the above-mentioned mixed liquid to obtain enriched and concentrated hydrobromic acid and distillation Mother liquor; Magnesium oxide in the concentrated hydrobromic acid, the amount of magnesium oxide added is determined according to the amount of hydrogen bromide, and the ratio of the amount of magnesium oxide added to the amount of hydrogen bromide is 1:1. After the stirring reaction is complete, an aqueous solution of bromide for mercury removal can be obtained; the mother liquor of distillation is returned to the bromine extraction step for acidification of seawater and brine.

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Abstract

The invention discloses a preparation method of a mercury removing bromide. According to the preparation method, hydrogen bromide gathered and separated from seawater and brine-extracted bromine enrichment liquid reacts with alkaline materials to produce the corresponding mercury removing bromide. The preparation method of the mercury removing bromide comprises the technical steps of raw liquid acidization, hydrogen bromide concentration and enrichment, neutralizing preparation and distilling mother liquid recycling, wherein the step of raw liquid acidization comprises adding concentrated sulfuric acid into the seawater and brine-extracted bromine enrichment liquid for acidization; the step of hydrogen bromide concentration and enrichment comprises distilling the acidized bromine enrichment liquid for enrichment; the step of neutralizing preparation comprises neutralizing distilled and separated hydrogen bromide through alkali or alkali metal oxide to obtain the aqueous solution of themercury removing bromide; the step of distilling mother liquid recycling comprises recycling distilling and separating mother liquid back to bromine extraction for acidizing seawater and brine. The preparation method of the mercury removing bromide is simple in process, reduces energy consumption of production of the mercury removing bromide and accordingly has a broad application prospect.

Description

Technical field [0001] The invention relates to a preparation method of bromide for mercury removal. Background technique [0002] Mercury is a trace heavy metal pollutant in the environment, which is persistent, bioaccumulative and genotoxic. Elemental mercury emitted into the atmosphere can be transported over long distances in regional and global areas along with the atmospheric circulation, and deposited in areas far away from pollution sources, resulting in an increase in the content of mercury or methylmercury in organisms, thus causing international academia and governments Wide attention. The Chinese government also attaches great importance to the problem of mercury pollution. Coal burning is one of the main sources of atmospheric mercury emissions in China. In 2013, my country’s coal consumption exceeded 3 billion tons, of which 50% was coal-fired by power plants. Therefore, coal-fired power plants are an important source of atmospheric mercury in my country. Emission ...

Claims

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Application Information

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IPC IPC(8): C01B9/04C01F5/36C01F11/34
CPCC01B9/04C01F5/36C01F11/34
Inventor 王玉琪黄西平张琦吴丹张文燕刘伟柴澍靖张欣
Owner 自然资源部天津海水淡化与综合利用研究所
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