Method for strengthening natural degradation of cyanide residue
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A technology of cyanide slag and building body, which is applied in the field of strengthening natural degradation of cyanide slag, can solve the problems of secondary pollution, lower moisture content, large area restrictions, etc., and achieve the effect of cleaning and deep purification treatment and saving production costs
Pending Publication Date: 2020-10-13
CHANGCHUN GOLD RES INST
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Problems solved by technology
At present, in addition to the above methods, reducing the moisture content of cyanide slag is the most direct treatment method, and to reduce the moisture content of cyanide slag generally takes three measures: filter press, natural drying or high-temperature drying. The ore grinding particle size of gold process ore is relatively fine, and some ores contain more oxidized ore components. Generally, the water content of cyanide slag can be reduced to 15% to 25% by filter press filter, and it is very difficult to further reduce it; natural drying is generally used After pressure filtration of cyanide slag, it is necessary to meet the climatic conditions of the enhanced natural degradation method in the "Technical Specifications for the Control of Cyanide Slag Pollution in the Gold Industry" (HJ 943-2018), which is relatively limited by the region; high-temperature drying can completely reduce the The water content of cyanide slag and the content of pollutants in the liquid phase, but the energy consumption is large, and it is easy to cause secondary pollution. Therefore, the gold industry has not yet developed an efficient, economical and clean deep purification treatment technology for cyanide slag.
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Embodiment 1
[0066] Cyanide-containing tailings slurry from a gold mine, the mass concentration of the slurry is 40%, and the pollutant components in the liquid phase and tailings are shown in Table 1. After being filtered by a filter press, the moisture content of the filter residue is 20.5%, and the toxicity leaching test results are shown in Table 1. 2. The treated cyanide slag is required to meet the tailings pond disposal requirements in the "Technical Specifications for Cyanide Slag Pollution Control in the Gold Industry" (HJ 943-2018), see Table 3.
[0067] Table 1 Analysis of pollutants in cyanide-containing tailings pulp
[0068]
[0069] Table 2 Results of pressure filter residue toxicity leaching test
[0070]
[0071] Note: The index unit in the table is mg / L.
[0072] Table 3 Cyanide slag tailings disposal standard limits
[0073]
[0074] Note: The index unit in the table is mg / L.
[0075] The press filter residue is transported to the above-mentioned solar green...
Embodiment 2
[0081] The moisture content of the tailings slag after the harmless treatment of cyanide-containing tailings slurry in a gold mine is 21%. The results of the toxicity leaching test are shown in Table 5. 2018), see Table 6.
[0082] Table 5 cyanide slag toxicity leaching test results
[0083]
[0084] Note: The index unit in the table is mg / L.
[0085] Table 6 Cyanide slag backfill utilization standard limit
[0086]
[0087] Note: The index unit in the table is mg / L.
[0088] The press filter residue is transported to the above-mentioned solar greenhouse with a belt conveyor, that is, on the floor in the airtight room 1, and the heating system 3, the floor heating system 4, the ventilation system 5, the dehumidification system 6, the monitoring system 10 and the control system 11 are turned on. Utilize the throwing machine 8 to distribute the cyanide slag 2, so that the cyanide slag 2 is spread on the floor of the airtight room body 1, and the temperature in the airti...
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Abstract
The invention belongs to the technical field of environmental protection field pollutant treatment methods, and particularly relates to a method for strengthening natural degradation of cyanide residue. A greenhouse cleaning system, a turning and throwing machine, a medicament spraying system and a monitoring system are additionally arranged on an existing closed solar greenhouse, and when the cyanogen residue is treated, the temperature in the solar greenhouse is maintained at 50 DEG C or above, and the humidity is in a non-saturated state, and the cyanogen residue carries out material distribution and material mixing by the turning and throwing machine, the medicament spraying system is used for uniformly spraying medicament to the cyanide residue, the cyanide residue medicament treatment is combined with the low-temperature drying treatment, and the sprayed medicament plays the role in removing cyanide or stabilizing heavy metal in the cyanide residue, so that the efficient, economical and clean deep purification treatment of the cyanide residue is realized; and a sodium hydroxide absorption tower is additionally arranged at the tail end of a ventilation system to absorb hydrogen cyanide in vapor, so that the safety and environmental protection of a rectification treatment system are guaranteed, and meanwhile the hydrogen cyanide evaporated in the cyanide residue can be recovered.
Description
technical field [0001] The invention belongs to the technical field of pollutant treatment methods in the field of environmental protection, and in particular relates to a method for strengthening natural degradation of cyanide slag. Background technique [0002] In the gold industry, although the cyanidation gold extraction process has a history of more than 100 years, due to the advantages of simple process and high gold recovery rate, it is still the mainstream wet gold leaching process in the global gold industry at present and in the future. Because the production process of the gold industry is different from other industries, the tailings yield is almost 100%. At present, more than 200 cyanide gold extraction enterprises in my country produce about 100 million tons of cyanide slag every year. With the increase of gold mining in my country, mining The grade gradually decreases, and the discharge of cyanide slag continues to increase every year. Cyanide slag contains ch...
Claims
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