Process for all-wet recovery of valuable elements in complex low-grade sulphide ore

Abstract

A process for all-wet recovery of valuable elements in a complex low-grade sulphide ore comprises the following steps: crushing and grinding a raw material, sieving the crushed and ground raw material, performing size mixing by use of a sodium hydroxide solution, and after that, performing pressurized oxidizing leaching to obtain an alkaline-leached solution and alkaline-leached residues; acidizing the alkaline-leached solution to obtain a lead sulfate product and a heavy lead solution, and performing potential reduction control step by step on the heavy lead solution to obtain crude selenium powder, crude tellurium powder and a post-reduction solution; performing copper-soaking on the alkaline-leached residues by use of a sulfuric acid solution to obtain copper-leached residues and a copper-leached solution; performing antimony and bismuth soaking on the copper-leached residues by use of an acid liquor containing chloride ions to obtain an antimony-leached solution and antimony-leached residues, feeding the antimony-leached slags to noble metals for recovery, and adjusting the pH of the antimony-leached solution step by step to obtain antimony residues and bismuth residues; adjusting the pH of the copper-leached solution to obtain iron residues and an iron-removed solution, wherein the iron residues serve as a waste water treatment additive, and the iron-removed solution is subjected to zinc dust replacement to obtain copper powder and a post-replacement solution; and merging the post-reduction solution and the post-replacement solution, and performing concentration and crystallization to obtain heptahydrate. The process is good in comprehensive recovery effect, strong in adaptation to the raw material, clean and environment-friendly in process, low in demand on equipment, adjustable in implementation scale and high in practicability.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of nonferrous metals, and specifically relates to a process for fully wet recovery of valuable elements in complex low-grade sulfide ores. Background technique [0002] After more than two centuries of mining and utilization, high-quality non-ferrous metal mineral resources worldwide have been greatly reduced, but the demand for non-ferrous metal products in modern society is increasing. Therefore, how to use complex and low-grade inferior minerals has become a non-ferrous A topic that needs to be focused on and researched in the field of metal smelting. [0003] Most non-ferrous metal minerals belong to sulfide ores. For the treatment of complex low-grade sulfide ores, large enterprises usually adopt pyrotechnics. Blister copper is produced, and then refined copper is produced by electrolytic refining. The fire process has problems such as incomplete metal separation, serious environmental polluti...

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Problems solved by technology

[0003] Most non-ferrous metal minerals belong to sulfide ores. For the treatment of complex low-grade sulfide ores, large enterprises usually adopt pyrotechnics. Blister copper is produced, and then refined copper is produced by electrolytic refining. The fire process has problems such as incomplete metal separation, serious environmental pollution, long process flow, high production cost, and large energy consumption. The load of the system has requirements, and small and medium-sized enterprises generally sell their complex low-grade sulfide ore as raw materials to large enterprises. Since this mineral does not meet any kind of concentrate standard, the valuation coefficient of the metal contained in it is often very low Yes, even some metals are not priced at all, resulting in huge economic losses for small and medium-sized enterprises

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