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Arsenious waste curing method as well as generated solid arsenic crystal product and application thereof

A technology for arsenic waste and waste, which is applied in the field of arsenic-containing waste treatment, can solve the problems of low arsenic solidification rate and cured products that cannot be used as resources, and achieve good arsenic fixation effect, compact structure, and high-efficiency stable transformation. Effect

Active Publication Date: 2013-08-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above results illustrate the feasibility of vitrification technology for arsenic-containing waste, but its high-temperature reduction and melting can volatilize arsenic, resulting in a low solidification rate of arsenic. Limitations of vitrified arsenic

Method used

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  • Arsenious waste curing method as well as generated solid arsenic crystal product and application thereof
  • Arsenious waste curing method as well as generated solid arsenic crystal product and application thereof
  • Arsenious waste curing method as well as generated solid arsenic crystal product and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The method for curing arsenic-containing waste in this embodiment (process flow chart is as follows figure 1 shown) includes the following steps:

[0043] (1) Grind the synthesized iron-arsenic precipitate (containing about 70% scorodite and 39% arsenic content), pass it through a 4-mesh sieve, and take 68.9g to mix with iron-boron-phosphorus basic glass batching H 3 BO 3 5.67g, P 2 o 5 31.79g, K 2 CO 3 1.96g, Na 2 CO 3 7.34g, arsenic stabilizer kaolin 12.4g (sorodite can be decomposed to produce Fe 2 o 3 , so there is no need to add network intermediates) after mixing evenly, dry it in a constant temperature oven at 60°C until the moisture content is 8%.

[0044] (2) Put the dried raw materials in a stainless steel mold (the inner wall of the stainless steel mold is coated with a layer of glass release agent), and then put it into a programmable hot-press sintering furnace, and keep the furnace temperature at a constant speed for 0.8h Raise to 450°C, and then...

Embodiment 2

[0049] The method for curing arsenic-containing waste in this embodiment (process flow chart is as follows figure 1 shown) includes the following steps:

[0050] (1) Mix arsenic-containing soot (4.6% arsenic content) from a lead smelting system in a smelter, grind it, pass through a 4-mesh sieve, and take 73.5g of it to mix with iron-boron-phosphorus basic glass ingredient H 3 BO 3 2.32g, P 2 o 5 18.62g, Fe 2 o 3 3.59g, K 2 CO 3 0.52g, Na 2 CO 3 1.19g and 5.25g of arsenic stabilizer CaO are mixed evenly and then dried in a 90°C thermostat until the moisture content is 5%.

[0051] (2) Put the dried raw materials into a stainless steel mold, then put them into a programmable hot-press sintering furnace, raise the temperature of the furnace to 450°C at a constant speed for 0.8h, and then keep it at this temperature for 2h. During the process, the internal pressure of the stainless steel mold is always maintained at 12MPa. After melting and homogenizing, it is naturally...

Embodiment 3

[0056] The method for curing arsenic-containing waste in this embodiment (process flow chart is as follows figure 1 shown) includes the following steps:

[0057] (1) Grind the polluted acid slag (28.8% arsenic content) from a smelter, pass it through a 4-mesh sieve, and take 39.9g of it to be mixed with the basic glass ingredient H of the iron-boron-phosphorus system 3 BO 3 4.87g, P 2 o 5 33.44g, Fe 2 o 3 9.42g, K 2 CO 3 2.71g, Na 2 CO 3 4.16g, arsenic stabilizer CaCO 3 10.5g was mixed evenly and then dried in a constant temperature oven at 65°C until the moisture content was 7%.

[0058] (2) Put the dried raw material into a stainless steel mold, then put it into a programmable hot-press sintering furnace, raise the temperature of the furnace to 400°C at a constant speed for 0.8h, and then keep it at this temperature for 1.2h. Keep the pressure at 11MPa during the heating process. After melting and homogenizing, cool down to room temperature naturally in a hot-pres...

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Abstract

The invention provides an arsenious waste curing method. The arsenious waste curing method comprises the following steps of: (1) grinding arsenious waste into powder, adding into iron, boron and phosphorous basic glass ingredients and a stabilizer, and uniformly mixing raw materials and drying; and (2) placing the dried raw materials into a stainless steel mould, heating to 400-500 DEG C at a constant speed within 0.8-1.2 hours, and insulating for 1-2 hours, wherein intensity of pressure in the stainless steel mould is maintained to be 10-12Mpa all the time in the heating process; and founding, homogenizing, then carrying out natural cooling to room temperature, taking out the mould, and demoulding, thus the solid arsenic crystal product is obtained. The invention also provides a solid arsenic crystal product generated by the arsenious waste curing method. Arsenic curing rate of the arsenious waste curing method is high, and the produced cured product can be used for making a building or decorative material.

Description

technical field [0001] The invention relates to a treatment method for arsenic-containing waste, in particular to a method for solidifying arsenic-containing waste and the resulting arsenic-fixed crystal product and its application. Background technique [0002] my country's mineral mining, non-ferrous smelting, chemical and chemical industries will produce a large amount of arsenic-containing materials, and the annual input of various types of arsenic is about 30,000 to 50,000 tons. Due to the lack of effective recycling technologies and safe utilization methods for arsenic, the current Arsenic waste residues are mostly disposed of by simply stacking or landfilling, which poses a great pollution and threat to the environment, and also causes a great waste of arsenic resources. Therefore, scientific and safe disposal of arsenic-containing waste residues has become an urgent problem to be solved in order to protect the environment and make full use of resources. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/19
Inventor 柴立元史美清梁彦杰李青竹杨姝闵小波杨志辉
Owner CENT SOUTH UNIV
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