Preparation method and application of copper-arsenic flotation separation inhibitor for mixed copper ore

Abstract

The invention discloses a preparation method and application of a copper-arsenic flotation separation inhibitor for mixed copper ore, and the preparation method comprises the following steps: (1) preparing a sulfuric acid solution with the mass concentration of 15%, performing heating to 30-35 DEG C in a water area, adding prepared mixed starch according to the solid-to-liquid ratio of the mixed starch to the sulfuric acid solution of 1: 5, and performing stirring and reacting for 1.5 hours at a constant temperature to obtain a reaction solution; (2) adding sulfuric acid into the reaction solution to adjust the pH value to 6.0-6.5, adding thiourea according to the mass ratio of thiourea to starch of 1: 3, further raising the temperature of the solution to 90 DEG C, and performing stirring to react for 45 minutes to obtain a colorless transparent solution after the reaction is completed; and (3) adding sodium hydroxide into the liquid obtained in the step (2) to adjust the pH value to 8.0-8.5, stirring for 30 minutes, performing concentrating and purifying by adopting a microfiltration membrane, and performing drying at the temperature of 50-60 DEG C to obtain a white powder product By adopting the inhibitor disclosed by the invention, poisonous sand ore and arsenic-containing pyrite can be inhibited in copper sulfide ore flotation of secondary copper ore under cyanide-free and oxidant-free moderate alkalinity conditions.

Description

technical field [0001] The invention relates to a preparation method of a beneficiation agent, in particular to a preparation method and application of a copper-arsenic flotation separation inhibitor for mixed copper ore. Background technique [0002] The unique chemical and physical properties of arsenic have a great impact on the human body, the surrounding environment and metal smelting, so it is defined as a toxic and harmful substance. Therefore, arsenic in copper concentrate will cause environmental pollution and increase costs during the smelting process, and excessive arsenic content in copper concentrate will affect metal refining and eventually reduce product purity. However, arsenic is a sulfur-friendly element, and almost all copper ores in the world contain arsenic. At the same time, in the enrichment process of copper ore flotation, because arsenopyrite and copper sulfide ore have similar floatability, it is difficult to remove arsenic from copper concentrate ...

AI Technical Summary

Problems solved by technology

The process mainly has the following problems: the amount of lime exceeds 10kg / t, and the pH of the slurry is above 12; The beneficiation wastewater produced cannot meet the discharge standard and the treatment cost is high

The effect of sodium humate alone is poor, and it is generally used in combination with potassium permanganate and bleaching powder. The effect of sodium sulfite and sodium cyanide alone is also poor, and it needs to be used in combination with other agents

In addition, after adding oxidant, the collector in the pulp is easy to oxidize and fail, and the copper recovery rate will decrease, and a large amount of oxidant will cause certain corrosion to the mineral processing equipment, reducing the service life of the equipment