Method for recovering valuable elements from gold-containing sulfur concentrate roasting slag pickle liquor

Abstract

The invention relates to a method for recovering valuable elements from gold-containing sulfur concentrate roasting slag pickle liquor, and belongs to the field of chemical beneficiation. The method comprises the following steps that (1) the contents and acidity of copper, zinc, iron, arsenic and sulfate radicals in acidic waste liquor are measured; (2) calcium carbonate or lime is added, concentrating and filtering are carried out to obtain a gypsum product and an acidic solution; (3) an oxidizing agent is added, then a sodium hydroxide solution is added, the pH value is 2.7-3.7 after the slurry reaction is finished, and arsenic-containing iron ore concentrate and copper-zinc-containing filtrate are obtained through concentration and filtration; (4) an arsenic precipitator is added, reacting is carried out for 30 minutes, concentrating, and filtering are carried out to obtain copper-zinc concentrate and acid-containing waste liquid; (5) the concentration of ore pulp is adjusted to be 50%, a sodium hydroxide solution is added, and then filtering and washing are carried out to obtain iron ore concentrate and arsenate-containing alkali liquor; and (6) sulfuric acid is added, the pH value of the solution is adjusted to 1, then the arsenic precipitator is slowly added, and then concentrating and filtering are carried out to obtain arsenic concentrate and acid-containing waste liquid. The arsenic-containing wastewater can be treated, and valuable elements in the arsenic-containing wastewater can be recycled.

Description

technical field [0001] The invention relates to a method for recovering valuable elements from acid leaching liquid of gold-containing sulfur concentrate roasting slag, belonging to the field of chemical beneficiation or hydrometallurgy, and relates to acid leaching or washing waste liquid treatment of gold-containing sulfur concentrate roasting slag in gold smelting technology field. Background technique [0002] At present, for the treatment of fine-grained disseminated gold-containing sulfur concentrates, many domestic enterprises adopt the method of roasting-pickling or water washing and other pretreatment-and then leaching gold. To remove harmful elements and improve the quality of slag (iron concentrate), slag pretreatment (i.e. pickling or water washing) is necessary. Therefore, it also involves the disposal of acidic waste liquid. Depending on the roasting raw materials, process and pickling cycle times, the types and contents of elements in the pickling waste liqui...

AI Technical Summary

Problems solved by technology

Among them, the lime-iron salt method utilizes the addition of lime, ferrous sulfate and air filling to form a colloidal mixture of ferric arsenate and ferric hydroxide, which has a strong adsorption force and forms co-precipitation together; in order to improve the effect of arsenic removal, the pH value Generally, it should be controlled at 9-10.5. At this time, other sulphate, copper, zinc, iron and other ions also form precipitates, so the amount of sediment produced is large, the post-treatment cost is high, and the valuable elements are difficult to recover; the vulcanization method is to use The vulcanizing agent converts metal ions and arsenic into insoluble sulfide precipitates, and then performs solid-liquid separation or recovers by flotation to remove arsenic and heavy metal ions. This method has high treatment efficiency for low-concentration arsenic-containing wastewater, but the formed Arsenic sulfide is difficult to separate from other sulfides, and the treatment effect on arsenite is poor, the residual amount is large, and there are environmental safety hazards; the ion exchange method uses a weakly basic anion resin to treat arsenic containing arsenic under appropriate pH conditions. Salt and arsenite sewage is effective, but this method requires high equipment investment, the resin used needs to be frequently regenerated, and the treatment cost is expensive; the adsorption method uses an insoluble solid material with a high specific surface area as an adsorbent, through physical Mechanisms such as adsorption, chemisorption or ion exchange fix the arsenic pollutants in water on the surface of itself, so as to achieve the purpose of removing arsenic, but it is difficult to regenerate, recycle and reuse the adsorbent in this method; membrane separation technology Using polymer or inorganic semi-permeable membrane as the separation medium, using external energy as the driving force, using the difference in mass transfer selectivity of the components in the multi-component fluid in the membrane to achieve separation, classification, purification or enrichment This method has strict requirements on equipment, membrane, and operating conditions, and the membrane is effective for As(V) removal, but the removal effect for As(Ⅲ) is not ideal, and the raw water needs to be pre-oxidized, which is very costly

To sum up, these methods are mostly limited to the harmless treatment of arsenic-containing wastewater, and the valuable elements in it are not considered to be recycled. High, difficult to achieve recycling

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