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A method for remelting and freezing to purify mixed salt containing arsenic, sodium sulfite and sodium sulfate

A sodium sulfite and mixed salt technology, applied in the purification of alkali metal sulfite/sulfate, chemical instruments and methods, arsenic compounds, etc., can solve the problems of no market value, environmental pollution, and inability to store for a long time, and achieve important environmental protection Benefits, elimination of environmental hazards, and high economic benefits

Active Publication Date: 2021-11-12
LEIYANG YANXIN NON FERROUS METALS
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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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  • A method for remelting and freezing to purify mixed salt containing arsenic, sodium sulfite and sodium sulfate

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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

A method for remelting, freezing and purifying a mixed salt containing arsenic, sodium sulfite and sodium sulfate, which is to filter the mixed salt after redissolving, freeze and precipitate sodium sulfite crystals in the filtrate, filter, and dry the separated crystals to obtain Na 2 SO 3 product, and the filtrate is passed into air for oxidation to oxidize the residual sodium sulfite to sodium sulfate, then precipitate arsenic, and press filter to separate As 2 S 5 Residue and filtrate, As 2 S 5 As 2 o 3 product, the filtrate is evaporated and concentrated to supersaturation, and Na is precipitated by cooling 2 SO 4 The crystals were centrifuged, and the resulting crystals were dried to obtain Na 2 SO 4 product. This method can separate and enrich the mixed salt at a lower production cost, so that the mixed salt that cannot be directly used has a market value according to its respective content. Integrating and processing high-quality arsenic trioxide products is convenient for market sales, and achieves harmless and resourceful treatment of arsenic that is strictly controlled by environmental protection.

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 Patents(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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