Method for recovering valuable metals from non-ferrous solid waste residue by split-flow co-extraction process
A non-ferrous solid, valuable metal technology, applied in the improvement of process efficiency, photography technology, photography auxiliary technology and other directions, can solve the problems of water pollution, serious problems, etc., to achieve zero discharge, improve leaching rate, improve the effect of operation rate
Active Publication Date: 2017-07-14
桐乡市思远环保科技有限公司
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Problems solved by technology
This method pollutes water more seriously. With the implementation of increasingly stringent environmental protection laws, it is no longer suitable for the comprehensive recovery of metals such as indium gallium germanium
[0005] The above two methods, while recovering valuable metals, will produce secondary polluting slag and industrial wastewater, which need to be further reprocessed
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[0073] One-stage pressurization and two-stage normal pressure countercurrent leaching process flow process of the present invention are as follows figure 1 Shown: In the second stage of zinc leaching, the acid-containing co-raffinate and colored solid waste, Air+SO 2 The mixed gas is fully mixed in the reactor, the pH value is controlled to be 3-3.5, and T=45-55°C. After leaching at normal pressure, the ore pulp is separated from liquid to solid in the zinc leaching second-stage thickening equipment, and the separated zinc leaching second-stage The supernatant of the first stage is purified by removing cadmium and manganese; while the underflow of the second stage of zinc leaching enters the first stage of zinc leaching and fully mixes and leaches with the acid-containing zinc extraction residue in the reactor. After pressure leaching, the ore pulp is subjected to liquid-solid separation in the first stage of zinc leaching thickening equipment, and the separated supernatant of...
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Abstract
The invention discloses a method for recycling valuable metal from colored solid waste residues through a flow-separating co-extraction process. At present, in the process of recycling valuable metal, slag and industrial wastewater which cause secondary pollution can be generated, and further treatment needs to be conducted on the pollutants. The method comprises the procedures of first-section pressurization leaching, second-section normal pressure reverse flow leaching, cadmium-manganese purification, indium-zinc-iron flow-separating co-extraction, hydrochloric acid regeneration and manganese-zinc-free electrodeposition; after the procedure of indium-zinc-iron flow-separating co-extraction is completed, three types of loaded organic phases are formed, and indium-iron co-extraction raffinate, indium-zinc co-extraction raffinate and zinc extraction raffinate are generated respectively; the three types of loaded organic phases are converged together and sequentially pass through a water washing section, an acid pickling section, an anti-zinc section, an anti-indium section, a second anti-iron section, a first anti-iron section and a chlorine washing section. By means of the method, zero-cost indium extraction is achieved, no industrial iron-removal waste residue is generated, and in addition, industrial wastewater zero discharging is achieved in the real sense.
Description
technical field [0001] The invention relates to the field of non-ferrous metal solid waste slag treatment, in particular to a method for recovering indium, zinc, iron and other valuable metals from non-ferrous metal solid waste slag by a split-flow co-extraction process. Background technique [0002] The valuable metal components in non-ferrous solid waste slag are relatively complex. According to the different components, the recovery methods adopted are also different, but at present, the recovery methods of indium, zinc and iron in non-ferrous solid waste slag are relatively simple at home and abroad, mainly as follows: kind: [0003] (1) Acid leaching impurity removal method: This method uses sulfuric acid as a leaching agent to leach indium, zinc, and iron metals under high acidity, and then uses iron powder as a reducing agent to reduce all ferric ions in the solution to di Valence iron ions, after extraction by P204, indium is taken out from the solution, and the ind...
Claims
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IPC IPC(8): C22B7/00C22B19/00C22B17/00C22B47/00C22B58/00C25C1/16
CPCC22B7/007C22B17/04C22B19/00C22B47/0063C22B58/00C25C1/16Y02P10/20
Inventor 朱富龙盛祖贵
Owner 桐乡市思远环保科技有限公司