A method for recovering valuable elements from acid leaching solution of gold-containing sulfur concentrate roasting slag

Abstract

The invention relates to a method for recovering valuable elements from acid leaching solution of gold-containing sulfur concentrate roasting slag, belonging to the field of chemical beneficiation, comprising the following steps: (1) Measuring the content of copper, zinc, iron, arsenic and sulfate in acidic waste liquid and acidity; (2) Add calcium carbonate or lime, concentrate and filter to obtain gypsum products and acidic liquid; (3) Add oxidizing agent, then add sodium hydroxide solution, the slurry reaction is finished with pH=2.7~3.7, concentrate and filter to obtain arsenic Iron concentrate and copper-zinc filtrate; (4) Add arsenic precipitant, react for 30 minutes, concentrate and filter to obtain copper-zinc concentrate and acid-containing waste liquid; (5) Adjust the pulp concentration to 50%, add hydrogen oxide Sodium solution, then filtered and washed to obtain iron concentrate and arsenate-containing lye; (6) adding sulfuric acid to adjust the solution to pH=1, then slowly adding arsenic precipitant, then concentrating and filtering to obtain arsenic concentrate and Acid waste. The invention can process the waste water containing arsenic and recycle the valuable elements therein.

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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