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Method for cooling reduction crystallization of As2O3

An as2o3, crystallization technology, applied in the field of metallurgy, can solve the problems of adhesion and scaling, low efficiency of reduction crystallization, etc., and achieve the effects of reducing dosage, enhancing reduction effect, and reducing cleaning times

Inactive Publication Date: 2019-04-12
郴州金铖环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of As 2 o 3 Cooling reduction crystallization method to solve the As 2 o 3 Reductive crystallization is inefficient and As 2 o 3 The problem of sticking and fouling

Method used

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  • Method for cooling reduction crystallization of As2O3

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Effect test

Embodiment 1

[0034] As provided by the present invention 2 o 3 The cooling reduction system adopted in the cooling reduction crystallization method is composed of cooling tank one 11, cooling tank two 10, reaction tank one 9, reaction tank two 8 and transfer tank 7 connected in sequence. A water-cooling coil 12 is arranged in the cooling tank and the reaction tank. The cooling water is input in two ways, the first cooling water enters from the cooling water inlet pipe 1, first enters the water cooling coil 12 in the cooling tank two 10, then enters the water cooling coil 12 in the cooling tank one 11, and finally the cooling water comes out The water pipe 2 is output; the second cooling water enters from the cooling water inlet pipe 1, first enters the water cooling coil 12 in the reaction tank 2 8, then enters the water cooling coil 12 in the reaction tank 1 9, and finally flows through the cooling water outlet pipe 2 output. This setup can avoid the As 2 o 3 The phenomenon of rapid ...

Embodiment 2

[0037] (1) Send 200L of arsenic-containing high-temperature leachate into cooling tank 1 provided with a water-cooling coil, and pass cold water into the water-cooling coil for primary cooling.

[0038] The primary cooled liquid is sent to the second cooling tank provided with a water-cooled coil, and cold water is passed into the water-cooled coil for secondary cooling until the liquid temperature is 38°C.

[0039] (2) Place the cooled liquid in reaction tank one, feed sulfur dioxide gas therein, reduce for 2 hours, stop feeding sulfur dioxide gas, input reaction tank two, and let it stand for 3 hours. While feeding the sulfur dioxide gas, the cold water input into the water-cooled coils in the reaction tank 1 and the reaction tank 2 is cooled. Calculated according to the molar ratio, arsenic in the liquid: sulfur dioxide = 2. The gas after reduction treatment is collected and washed with lye before being discharged.

[0040] The cold water in the step (1) and the step (2) ...

Embodiment 3

[0044] (1) Send 500L of arsenic-containing high-temperature leaching solution into cooling tank 1 provided with a water-cooling coil, and pass cold water into the water-cooling coil for primary cooling.

[0045] The primary cooled liquid is sent to the second cooling tank provided with a water-cooled coil, and cold water is passed into the water-cooled coil for secondary cooling until the liquid temperature is 36°C.

[0046](3) Place the cooled liquid in reaction tank one, feed sulfur dioxide gas therein, reduce for 2.5 hours, stop feeding sulfur dioxide gas, enter reaction tank two, and let it stand for 3.5 hours. While feeding the sulfur dioxide gas, the cold water input into the water-cooled coils in the reaction tank 1 and the reaction tank 2 is cooled. Calculated according to the molar ratio, arsenic in the liquid: sulfur dioxide = 2.5. The gas after reduction treatment is collected and washed with lye before being discharged.

[0047] The cold water in the step (1) and...

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Abstract

The invention provides a method for cooling reduction crystallization of As2O3. The method comprises the steps: sending a high temperature liquid containing arsenic into a No. 1 cooling trough provided with a water-cooling coil, introducing cooling water into the water-cooling coil for first-stage cooling, sending the cooled liquid obtained after first-stage cooling to a No. 2 cooling trough provided with a water-cooling coil, introducing cooling water into the water-cooling coil for second-stage cooling until the liquid temperature is lower than 40 DEG C, transferring the cooled liquid into aNo. 1 reaction trough, introducing sulfur dioxide gas into the No. 1 reaction trough for reduction for a reduction period of 2-3 hours, then transferring the reduced liquid into a No. 2 reaction trough, performing still standing for 3 hours or above, introducing air into the reduced solution, performing stirring for 20-30 minutes, and performing centrifugation on the aerated solution so as to obtain a centrifuge mother liquor and the As2O3 crystal. Through the method, the scaling phenomenon caused by adhesion of As2O3 to the cooling coils can be avoided, and the purity of the prepared As2O3 crystal is more than 98%.

Description

technical field [0001] The invention relates to the field of metallurgy technology, in particular to an As 2 o 3 cooling reduction crystallization method. Background technique [0002] In the hydrometallurgical leaching arsenic removal process, most of the arsenic leached into the liquid phase exists in the form of pentavalent arsenic. Preparation of As 2 o 3 The method is usually to first reduce pentavalent arsenic to trivalent arsenic, and then use As 2 o 3 The principle of low temperature solubility is very low, and it is precipitated by cooling and crystallization to obtain As 2 o 3 product. In the process of reduction, cooling and crystallization, at present, the method of batch operation of independent reactors is used for processing. This method requires a lot of reaction equipment, low efficiency, and the cooling device (coil, jacket, etc.) is prone to fouling, and is greatly affected by subjective factors such as the technical level of the operator, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G28/00B01D9/02
CPCC01G28/005B01D9/00B01D2009/0086
Inventor 范运行郭波平
Owner 郴州金铖环保科技有限公司
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