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Drying method for evaporative crystallization liquid of vanadium precipitation wastewater and method for recovering sodium sulfide

A technology for evaporative crystallization and precipitation of vanadium wastewater, applied in chemical instruments and methods, alkali metal sulfides/polysulfides, water pollutants, etc., can solve the problems of low efficiency of drying evaporation liquid, poor purity of sodium sulfide, etc., and achieve drying The effect of shortening the time

Active Publication Date: 2020-09-25
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the efficiency of this method drying evaporated liquid is lower, and the sodium sulfide purity that obtains is also relatively poor

Method used

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  • Drying method for evaporative crystallization liquid of vanadium precipitation wastewater and method for recovering sodium sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] a. Take 1kg of vanadium precipitation wastewater evaporating crystallization solution, and evaporate the vanadium precipitation wastewater evaporating crystallization solution by segmented heating. The process of segmented heating is: first heat at 1050°C for 0.25h; then heat at 1100°C for 0.5h ; Finally heated at 1150 ℃ for 0.75h. After evaporating, the water content of vanadium precipitation wastewater evaporating crystallization solution is 4.7%;

[0056] b. Pulverize the pulverized coal until the particle size is less than 3mm;

[0057] c. Mix the dried raw material and pulverized coal in a weight ratio of 250:51, heat with gas to carry out a reduction reaction, the reaction temperature is 1000°C, and the reaction time is controlled at 2h to obtain a pre-product;

[0058] d. Cool the pre-product to 700°C, put it into NaOH solution with a temperature of 80°C and a concentration of 75% for leaching for 4 hours, after leaching, take the supernatant, concentrate and dr...

Embodiment 2

[0067] a. Take 1kg of vanadium precipitation wastewater evaporating crystallization solution, and evaporate the vanadium precipitation wastewater evaporating crystallization solution by segmented heating. The process of segmented heating is: first heat at 1075°C for 0.25h; then heat at 1085°C for 0.5h ; Finally heated at 1145 ° C for 0.75h. After evaporating, the water content of vanadium precipitation wastewater evaporating crystallization solution is 4.8%;

[0068] b. Pulverize the pulverized coal until the particle size is less than 3mm;

[0069] c. Mix the dried raw material and pulverized coal in a weight ratio of 250:51, heat with gas to carry out a reduction reaction, the reaction temperature is 1000°C, and the reaction time is controlled at 2h to obtain a pre-product;

[0070] d. Cool the pre-product to 700°C, put it into a NaOH solution with a temperature of 80°C and a concentration of 75% for leaching for 4 hours, after leaching, take the supernatant, concentrate an...

Embodiment 3

[0073] a. Take 1kg of vanadium precipitation wastewater evaporating crystallization solution, and evaporate the vanadium precipitation wastewater evaporating crystallization solution by segmented heating. The process of segmented heating is: first heat at 1000 °C for 0.25h; then heat at 1135 °C for 0.5h ; Finally heated at 1175 ℃ for 0.75h. After evaporating, the water content of vanadium precipitation wastewater evaporating crystallization solution is 4.9%;

[0074] b. Pulverize the pulverized coal until the particle size is less than 3mm;

[0075] c. Mix the dried raw material and pulverized coal in a weight ratio of 250:51, heat with gas to carry out a reduction reaction, the reaction temperature is 1000°C, and the reaction time is controlled at 2h to obtain a pre-product;

[0076] d. Cool the pre-product to 700°C, put it into a NaOH solution with a temperature of 80°C and a concentration of 75% for leaching for 4 hours, after leaching, take the supernatant, concentrate an...

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Abstract

The invention relates to a drying method for evaporative crystallization liquid of vanadium precipitation wastewater and a method for recycling sodium sulfide, belonging to the field of recycling of vanadium extraction waste liquid. According to the drying method for the evaporative crystallization liquid of the vanadium precipitation wastewater, the for evaporative crystallization liquid of the vanadium precipitation wastewater is dried in a sectional heating mode. A sectional heating method comprises the following steps: firstly, carrying out heating for 0.25 to 0.5 hour at 1000 to 1075 DEGC; then, performing heating for 0.25 to 0.5 h at a temperature of 1085 to 1135 DEG C; and finally, conducting heating for 0.5-1 hour at a temperature of 1145-1175 DEG C. The evaporative crystallization liquid of the vanadium precipitation wastewater is treated in the sectional heating mode, so drying time is shortened by 75% or above, efficiency is improved, and cost is saved.

Description

technical field [0001] The invention relates to a drying method for evaporating crystallization liquid of vanadium precipitation waste water and a method for recovering sodium sulfide, and belongs to the field of recycling and utilization of vanadium extraction waste liquid. Background technique [0002] Sodium sulfide is one of the important chemical raw materials, widely used in dyestuff, leather industry, paper industry, chemical industry, pharmaceutical industry, paint, textile and other industries. At present, sodium sulfide is generally produced by the reaction of Glauber's salt and pulverized coal. The extraction rate of sodium sulfide produced by traditional technology is not high, the purity is difficult to reach a high concentration level, and the cost of the technology is high, and it also has very serious environmental protection problems. The accumulation of solid waste generated by vanadium extraction enterprises is also a huge problem faced by China. The accu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01B17/26C02F101/16
CPCC02F9/00C01B17/26C01P2006/80C02F1/705C02F1/5236C02F1/001C02F1/04C02F1/20C02F2101/16
Inventor 赵珏瑶张士举徐玲俐曾成华侯亚辉赵锐邓玉芳
Owner PANZHIHUA UNIV
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