High grade cobalt sulfonate slag and production process thereof

Abstract

The invention relates to high grade cobalt sulfonate slag produced by using ammonium sulfate instead of copper sulfate as an oxidant. The high grade cobalt sulfonate slag comprises 15 to 21 percent of cobalt. The method comprises the following steps: preparing an agent from sodium isethionate, ammonium persulfate and cobalt in a ratio of (9-12):(4-5):(0.5-2); preparing the sodium isethionate into a 10 percent solution, and preparing the ammonium persulfate into a solution for later use; introducing 40 to 45 m<3> of two-stage cadmium removing solution into a cobalt removing tank, controlling the pH of initial acid to be more than 5.0, adding sodium hydroxide to regulate the pH to the required range when the acidity is high, and controlling the temperature to be less than or equal to 45DEG C; and adding the ammonium persulfate, slowly and uniformly adding the sodium isethionate, controlling the dosing time to be 20-30 minutes, reacting for 0.5 to 1.5 hours, discharging a solution into a middle tank by opening a bottom current valve, pumping into a cobalt removing filter press by using a pump for filter pressing, unloading the cobalt slag into a cobalt slag primary rinsing bath, and conveying filtrate into a leaching workshop.

Description

technical field [0001] The present invention relates to a kind of using ammonium persulfate instead of conventional oxidant (copper sulfate) as oxidant to produce high-grade cobalt xanthate slag and its production process, more specifically to a kind of wet zinc smelting process, which utilizes the above-mentioned recycling cobalt process to remove cobalt. Background technique [0002] There are three main processes for the recovery of cobalt in the zinc hydrometallurgy process, namely antimony salt cobalt removal process, β-naphthol cobalt removal process and sodium ethyl sulfonate cobalt removal process. At present, the cobalt removal process of antimony salt is mainly used in the zinc liquid purification process of wet smelting. The cobalt in the zinc concentrate enters the purification slag to open the circuit during the liquid purification process. The recovery process of cobalt metal in the purification slag mainly includes β-naphthol cobalt removal process and Sodium...

AI Technical Summary

Problems solved by technology

However, the cobalt removal process using copper sulfate as the oxidant has the disadvantages that the oxidant is expensive, and the cobalt sulfonate residue contains copper impurities, and the oxidant itself consumes sodium ethyl sulfonate. This process needs further improvement.

[0006] Chinese patent application CN1172859A and CN101440431A disclose the method that utilizes cobalt xanthate slag to reclaim cobalt respectively, yet its cobalt xanthate slag all utilizes copper sulfate to remove cobalt and obtains, and the technique for preparing cobalt xanthate slag has the following defects: (1) The traditional sodium ethyl sulfonate cobalt removal process using copper sulfate as an oxidant, copper sulfate is expensive, resulting in high cost of cobalt removal, the purpose of the present invention is to use cheap oxidant instead of copper sulfate as oxidant

[0008] (3) Traditional sodium ethyl sulfonate removes cobalt process, oxidant copper sulfate reacts with sodium ethyl sulfonate, consumes sodium ethyl sulfonate additionally, further increases the cost of removing cobalt, the purpose of the present invention is to select a kind of ethyl sulfonate Sodium sulfonate is an oxidizing agent for removing cobalt. The oxidizing agent does not react with sodium ethyl sulfonate and minimizes the amount of sodium ethyl sulfonate.

[0009] (4) The cobalt salt produced by the traditional sodium ethyl sulfonate cobalt removal process has low efficiency and low cobalt content

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