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Method for redissolving, freezing and purifying mixed salt containing arsenic, sodium sulfite and sodium sulfate

A sodium sulfite and mixed salt technology, which is applied in alkali metal sulfite/sulfate purification, chemical instruments and methods, arsenic compounds, etc., can solve the problems of no market value, environmental pollution, low main content of sodium sulfite, etc., and achieve important environmental protection Effectiveness, high economic benefits, and the effect of eliminating hidden dangers of environmental protection

Active Publication Date: 2021-04-06
LEIYANG YANXIN NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the mixed salt has no market value because the main content of sodium sulfite is too low; Resource disposal

Method used

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  • Method for redissolving, freezing and purifying mixed salt containing arsenic, sodium sulfite and sodium sulfate

Examples

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Embodiment 1

[0019] Step 1: Redissolve the mixed salt, use a 1000ml beaker, fill 1000ml of water, place it on an electric heating magnetic stirring table, heat the water to above 50°C, slowly add 550g of mixed salt containing arsenic, sodium sulfite and sodium sulfate into the hot water , the typical composition of the mixed salt is: H 2 O 6%, Na 2 SO 3 70%, Na 2 SO 4 8%, As 0.6%; after complete melting, control the water temperature at 38°C to 42°C, and measure the specific gravity of the aqueous solution as 1.27, in the solution: Na 2 SO 3 The content is 38.5g / 100g H 2 O; Na 2 SO 4 The content is 4.4g / 100g H 2 O.

[0020] Step 2: Filter the heavy solution, use a 1500ml vacuum filter bottle, put a Φ120mm porous funnel on it, use a medium-speed filter paper, connect a vacuum pump, and filter the above heavy solution. Because the process time is short, the liquid temperature does not drop significantly, and the filtration is smooth.

[0021] Step 3: Put the above-mentioned filtr...

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Abstract

The invention relates to a method for purifying mixed salt containing arsenic, sodium sulfite and sodium sulfate by redissolving and freezing, and the method comprises the following steps: redissolving the mixed salt, carrying out filtering, freezing the filtrate to precipitate sodium sulfite crystals, carrying out filtering, drying the separated crystals to obtain a Na2SO3 product, introducing air into the filtrate to oxidize the residual sodium sulfite into sodium sulfate, precipitating arsenic, and carrying out filter pressing to separate As2S5 filter residues and filtrate, performing pyrogenic process on As2S5 filter residues to obtain an As2O3 product, evaporating and concentrating filtrate to supersaturation, carrying out cooling to separate out Na2SO4 crystals, carrying out centrifuging, and drying the obtained crystals to obtain a Na2SO4 product. According to the method, the mixed salt can be separated and enriched at a lower production cost, so that the mixed salt which cannot be directly utilized generates market values according to respective contents, and more importantly, the harmful substance arsenic with lower content can be enriched at a high rate to form a high-quality arsenic trioxide product, thereby facilitating market sale and development, and achieving the harmless and resourceful treatment on the environment-friendly strictly-controlled arsenic.

Description

technical field [0001] The invention belongs to inorganic sulfate chemical technology and environment-friendly arsenic treatment technology, and relates to a method for remelting and freezing mixed salt containing arsenic, sodium sulfite and sodium sulfate. Background technique [0002] In the non-ferrous smelting industry, some enterprises often use waste to treat waste, and use the water of arsenic-containing industrial alkali slag to leach lye and use it as the absorption liquid of the desulfurization tower to absorb SO in the smelting flue gas. 2 , to produce sodium sulfite, but at the same time, part of the sodium sulfite is oxidized into sodium sulfate. After the subsequent refined absorption solution, multi-effect evaporation crystallization and centrifugation to remove the mother liquor, the mixed salt by-product of sodium sulfite and sodium sulfate containing arsenic is produced. The typical composition of salt is: H 2 O 6%~8%, Na 2 SO 3 65%~75%,Na 2 SO 4 8%~...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/16C01G28/00
CPCC01D5/16C01G28/005C01P2006/80
Inventor 梁金凤石仁章石宏娇石俊阳石仁才刘小路邓国庆
Owner LEIYANG YANXIN NON FERROUS METALS
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