Comprehensive recovery process for difficult-to-separate copper-lead-zinc mixed concentrate
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A technology of mixing concentrate, separation and recovery, applied in photography process, wet separation, solid separation and other directions, can solve the problems of ineffective separation and affecting the economic benefits of enterprises.
Inactive Publication Date: 2020-05-08
尤灵革
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Problems solved by technology
At present, for the difficult-to-separate copper-lead-zinc mixed concentrate, what is lacking is a process method with effective separation, reasonable cost and less environmental pollution.
[0003] A large amount of difficult-to-separate copper-lead-zinc mixed concentrates are produced in the western region every year, which affects the economic benefits of enterprises due to ineffective separation
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Embodiment 1
[0024] A company in Shijiazhuang, Hebei uses cyanide tailings to produce gold, silver, copper, lead, and zinc mixed fine powder (the grades of gold, silver, copper, lead, and zinc are 5g / t, 300g / t, 3wt%, 20wt%, respectively. 15wt% hard-to-separate copper-lead-zinc mixed concentrate) because its nature is hard-to-separate fully sulfide gold-silver-copper-lead-zinc mixed concentrate, so there is no need for acid leaching-extraction-electrodeposition of the copper oxide part, and all subsequent processes are all match. After the raw materials are finely ground, the -200 mesh is greater than 95%, the pulping concentration is 15wt%, and the conversion agent and activator are added to enter the ammonia conversion process of lead elements. The specific conditions are: at a temperature of 52°C, the reaction time is 5-10 hours, the conversion agent is ammonium bicarbonate, and the catalyst is sodium lauryl sulfate. Based on the mixed concentrate, the addition amount of the conversion a...
Embodiment 2
[0027] A large state-owned enterprise in Tibet is currently producing refractory copper-lead-zinc mixed concentrates. The grades of gold, silver, copper, lead and zinc are 3g / t, 500g / t, 12wt%, 15wt%, 5wt% refractory Copper-lead-zinc mixed concentrates, such as figure 1 As shown, now the pulp concentration is 70wt% and finely ground to -200 mesh above 95%, then add water and 30g / L sulfuric acid and stir at 100 rpm for 30 minutes to leaching copper oxide, so that the concentration of the concentrate is 25wt%, and the pH of the pulp =2, solid-liquid separation to obtain copper sulfate solution and copper leaching slag, the copper sulfate solution is extracted, enriched and purified, and then enters the wet electrowinning process of copper. The specific conditions: the electrowinning solution contains 150 g / L of sulfuric acid and 50 g of copper ions / L, cell voltage 2 V, current density 240 A / m 2 , to produce the national standard 1# electrodeposited copper; the residual extracti...
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Abstract
The invention discloses a comprehensive recovery process for difficult-to-separate copper-lead-zinc mixed concentrate, and belongs to the technical field of metal recovery and utilization. The processcomprises the following steps: (1) finely grinding the mixed concentrate until the concentrate with 200 meshes accounts for more than 95%; (2) adding water and sulfuric acid into the mixed concentrate after fine grinding to carry out slurry mixing, so that the slurry concentration after slurry mixing is 30 wt%, and the pH value is 1-3; (3) performing solid-liquid separation to obtain a copper sulfate solution and copper leaching slag, and performing extraction and electrodeposition on the copper sulfate solution to produce national standard 1# electrodeposition copper; (4) performing slurry mixing on the copper leaching slag to perform ammonia conversion on lead sulfide in the copper leaching slag, and performing solid-liquid separation to obtain conversion liquid and conversion slag; (5)performing fluosilicic acid solution leaching on the conversion slag, performing solid-liquid separation to obtain lead leaching liquid and lead leaching slag, purifying the lead leaching liquid, andelectrodepositing lead to produce national standard 1# electrodeposition lead; and (6) performing superfine grinding on the lead leaching slag until the slag with 400 meshes accounts for more than 95%, and adopting one-stage roughing, two-stage scavenging and two-stage concentration to obtain copper concentrate, wherein tailings are zinc concentrate.
Description
technical field [0001] The invention belongs to the field of metal recovery and utilization, and in particular relates to a comprehensive recovery process of difficult-to-separate copper-lead-zinc mixed concentrate. Background technique [0002] Difficult-to-separate copper-lead-zinc mixed concentrate belongs to the gold-silver-copper-lead-zinc mixed ore produced in Tibet, Qinghai, Xinjiang and other regions. After flotation, due to the nature of the mineral itself, each element is symbiotic, and various methods such as ultra-fine grinding cannot be effective. Mixed polymetallic concentrate produced by separation. It is difficult to comprehensively recover each valuable element. At present, the downstream processing enterprises in the market are not able to effectively use the copper-lead-zinc mixed concentrate. For example, the raw materials of copper smelting enterprises contain more than 3% lead and zinc, which is a harmful element. Copper and zinc containing more than ...
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