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Gold smelting wastewater treatment technology

A technology for wastewater treatment and gold, applied in the field of metallurgy, can solve problems such as pipeline/equipment blockage, increased sodium cyanide consumption, corrosion, etc.

Inactive Publication Date: 2020-11-03
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the reused cyanide wastewater re-enters the cyanide process, the residual Cu, Pb and Zn plasma in the wastewater will additionally increase the consumption of sodium cyanide in the cyanide process and increase the production cost; in addition, in the process of wastewater recycling , the salinity continues to accumulate, and inorganic salt crystallization is prone to occur, resulting in pipeline / equipment blockage, serious scaling and corrosion, resulting in problems such as lower recovery rates of gold, silver, copper and other valuable metals and lower product quality
Generally, the methods for treating acidic wastewater and cyanide wastewater include chemical precipitation, redox, solvent extraction separation, membrane separation, sulfuric acid-zinc sulfate method and desorption-absorption method, etc., but these methods still have high cost, The problem of low wastewater reuse rate

Method used

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Examples

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Comparison scheme
Effect test

example 1

[0015] After the green algae is crushed, it is shaped, freeze-dried, and then carbonized at a low temperature. The precursor was placed in a tube furnace under N 2 Under the atmosphere, the temperature was raised to 500 °C at a heating rate of 3 °C / min and kept for 3 h to obtain carbonized green algae. The solar water evaporation device is placed in a container containing pure water, and the simulated solar power density is 1 kW / m 2 , the evaporation rate of water is 1.66 kg·m -2 h -1 .

example 2

[0017] After the green algae is crushed, it is shaped, freeze-dried, and then carbonized at high temperature. The precursor was placed in a tube furnace under N 2 Under the atmosphere, the temperature was raised to 500 °C at a heating rate of 5 °C / min and kept for 1 h; then the temperature was raised to 800 °C at a heating rate of 5 °C / min and kept for 1 h to obtain carbonized green algae. The solar water evaporation device is placed in a container containing pure water, and the simulated solar power density is 3 kW / m 2 , the evaporation rate of water is 5.18 kg·m -2 h -1 .

example 3

[0019] After the green algae are crushed, shaped, freeze-dried, and carbonized at high temperature. The precursor was placed in a tube furnace under N 2 Under the atmosphere, the temperature was raised to 500 °C at a heating rate of 4 °C / min, kept for 2 h, and then raised to 800 °C at a heating rate of 3 °C / min and kept for 2 h to obtain carbonized green algae. The solar water evaporation device is placed in a container containing seawater, and the simulated solar power density is 1 kW / m 2 , the evaporation rate of water is 1.48 kg·m -2 h -1 . The evaporated water is collected, and the ion concentration of the collected water is detected by an inductively coupled plasma emission spectrometer. The results showed that K in the collected water + 、Na + , Ca 2+ , Mg 2+ The plasma concentration is lower than the national drinking water standard.

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Abstract

The invention provides a gold smelting wastewater treatment technology, and aims at the problems of high treatment cost and low wastewater reuse rate of acid wastewater and high-concentration cyanide-containing wastewater generated in the gold smelting process. A solar water evaporation device is constructed, smelting wastewater is evaporated in an interface heating mode, steam is condensed and collected, and then the purpose of water treatment is achieved. According to the invention, cheap and easily available green alga is used as a raw material and is molded by crushing, suction filtrationand other methods, and is further carbonized to obtain the porous structure biomass charcoal material, which can efficiently absorb full-spectrum sunlight and convert the sunlight into heat energy, sothat the product has excellent solar water evaporation performance, and can stably exist in acidic and alkaline environments. Therefore, the method has a good application prospect in the field of gold smelting wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a process for comprehensive recovery of gold smelting wastewater and zero discharge of wastewater. Background technique [0002] The rapid development of the gold industry and the continuous development and utilization of refractory gold resources have brought about an increase in resource and energy consumption, and a corresponding increase in the types and total amount of pollutants. In the traditional gold refining process, acidic wastewater after copper extraction and cyanidation wastewater with high salt content, heavy metal ions (Cu, Pb, Zn) and cyanide residues will be produced. According to the industry wastewater discharge standards, cyanide wastewater Reuse rate ≥ 80%. After the reused cyanide wastewater re-enters the cyanide process, the residual Cu, Pb and Zn plasma in the wastewater will additionally increase the consumption of sodium cyanide in the c...

Claims

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Application Information

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IPC IPC(8): C02F1/14C02F103/16
CPCC02F1/14C02F2103/16Y02A20/212
Inventor 杨丽霞梁英张超凡陈厚杨华伟柏良久魏东磊王文香
Owner LUDONG UNIVERSITY
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