Process for purifying coarse arsenic

A technology, arsenic fume technology, applied in the field of leaching of non-metal oxides, can solve environmental pollution, no direct use value, unsafe and other problems

Inactive Publication Date: 2010-08-11
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Crude arsenic General As 2 o 3 The content is 70-92%, not only has no di

Method used

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  • Process for purifying coarse arsenic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Take 100g of high-arsenic fume and put it in a 500mL sealed reaction kettle, add 200mL of ammonia solution with a concentration of 5.0mol / L at a liquid-solid ratio of 2.0:1, and react for 3 hours at a temperature of 50°C.

[0023] 2. Elevate the temperature to evaporate excess ammonia, and the evaporated ammonia is absorbed by the ammonia absorption tower, and the ammonia solution is absorbed to replenish ammonia and then returned to the crude arsenic leaching.

[0024] 3. After distilling ammonia, filter with a vacuum filter, wash with hot water twice the amount of residue, return the filter residue to the raw material for arsenic removal, and remove impurities from the filtrate.

[0025] 4. The material liquid is heated, evaporated and crystallized, and then dried in an oven to remove the adsorbed water.

[0026] 5. The dried crystals are placed in a strip crucible and decomposed in a tube furnace at 500°C. The decomposed solid dust is collected after the tube furn...

Embodiment 2

[0029] 1. Take 1000g of high-arsenic fume and put it in a 5000mL sealed reaction kettle, add 1000mL of ammonia solution with a concentration of 6.0mol / L at a liquid-solid ratio of 1:1, and react at a temperature of 65°C for 5 hours.

[0030] 2. Elevate the temperature to evaporate excess ammonia, and the evaporated ammonia is absorbed by the ammonia absorption tower, and the ammonia solution is absorbed to replenish ammonia and then returned to the crude arsenic leaching.

[0031] 3. After distilling ammonia, filter with a vacuum filter, wash with hot water 1.5 times the amount of residue, return the filter residue to the raw material for arsenic removal, and remove impurities from the filtrate.

[0032] 4. The material liquid is heated, evaporated and crystallized, and then dried in an oven to remove the adsorbed water.

[0033] 5. The dried crystals are placed in a strip crucible and decomposed in a tube furnace at 200°C. The decomposed solid dust is collected after the tube...

Embodiment 3

[0036] 1. Take 1000g of high-arsenic fume and put it in a 10000mL sealed reaction kettle, add 5000mL of ammonia solution with a concentration of 2.0 at a liquid-solid ratio of 5.0:1, and react for 6 hours at a temperature of 30°C.

[0037] 2. Elevate the temperature to evaporate excess ammonia, and the evaporated ammonia is absorbed by the ammonia absorption tower, and the ammonia solution is absorbed to replenish ammonia and then returned to the crude arsenic leaching.

[0038] 3. After distilling ammonia, filter with a vacuum filter, wash with hot water twice the amount of residue, return the filter residue to the raw material for arsenic removal, and remove impurities from the filtrate.

[0039] 4. The material liquid is heated, evaporated and crystallized, and then dried in an oven to remove the adsorbed water.

[0040] 5. The dried crystals are heated to 600°C in the decomposition furnace and decomposed. The decomposed solid dust is collected after cooling in the tube fur...

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Abstract

The invention provides a process for purifying coarse arsenic. The process is characterized in that: putting high-arsenic dust in a sealed reaction kettle, adding 2.0 to 8.0mol/L ammonia water in a liquid-solid ratio of 1.0-5.0:1 into the reaction kettle to perform a reaction for 2 to 6 hours at the temperature of between 30 and 65 DEG C; heating the mixed solution so as to evaporate excessive ammonia, making the distilled ammonia absorbed by an absorption tower, and after ammonia-absorbing solution is supplied with ammonia, returning the ammonia-absorbing solution for coarse arsenic extraction; after the ammonia is evaporated, filtering the mixed solution, washing residue by hot water in an amount which is 1 to 2 times the amount of the residue, returning filter residue for raw material dearsenization treatment, and performing impurity removing treatment of filtrate; heating feed liquid for evaporation and crystallization, and removing the adsorption water by drying; and heating the dried crystals in a decomposition furnace to between 200 and 600 DEG C for decomposition, collecting solids of white arsenic, and making decomposed gas enter the ammonia absorption tower for absorption so as to recover the ammonia. In the process of the invention, a wet method and a dry method are combined to pure the white arsenic, so that the production cost is greatly lowered, less raw materials are consumed, the total yield of arsenic is high, the circulation is realized in the whole process, and waste gas, water and solid are emitted.

Description

technical field [0001] The invention belongs to the leaching of non-metal oxides, in particular to a method for purifying crude arsenic. Background technique [0002] White arsenic (As 2 o 3 ) commonly known as arsenic, scientific name arsenic trioxide; arsenic oxide (III); arsenous anhydride; white powder or crystal, monoclinic crystal system (density 4.15g / cm 3 ), cubic system (density 3.865g / cm 3 sublimates at 193°C). Amorphous body (density 3.738g / cm 3 ), less soluble in cold water and more soluble in hot water. The aqueous solution is acidic. The first two crystals are soluble in ethanol, acids and bases; the amorphous form is soluble in acids and bases, but insoluble in ethanol. Toxic! [0003] There are two methods of white arsenic production: fire production and wet production. [0004] Pyrochemical production: It is suitable for the treatment of high arsenic fumes from pre-roasted arsenic concentrates and arsenic-containing materials. Use As 2 o 3 It has...

Claims

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Application Information

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IPC IPC(8): C22B30/04
Inventor 周新木
Owner NANCHANG UNIV
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