Method for stabilizing water-soluble manganese ions in manganese ore leaching residue

Abstract

The invention provides a method for stabilizing water-soluble manganese ions in manganese ore leaching residue. The method comprises the following basis steps: mixing and pulping the manganese ore leaching residue and water in a liquid-solid ratio of 2:1 to 6:1, adjusting the pH value of the slurry to be 7 to 10 by saturated whitewash, adding sodium silicate in the mass ratio to the manganese ore leaching residue of 2 to 5 percent, stirring for reacting for 5 to 60 minutes at the temperature of 25 to 60 DEG C, and after the reaction is completed, filtering the mixture till the solidification rate of Mn<2+> in the manganese ore leaching residue reaches more than 98 percent and reaches the grade-A discharging concentration standard in identification for extraction toxicity (GB5085.3-2007) and the integrated sewage discharging standard (GB8978-96). The method has the advantages that the process flow is simple; by a wet-method mixing way, the uniform mixing of a curing agent and the manganese ore leaching residue can be realized, the consumption of the curing agent can be greatly reduced, and the treatment cost is low.

Description

Technical field: [0001] The invention relates to a method for stabilizing manganese ore leaching slag, which is particularly suitable for using silicate to solidify water-soluble manganese ions in manganese ore leaching slag under alkaline conditions, and belongs to the field of comprehensive treatment of industrial solid waste. Background technique: [0002] Manganese ore leaching slag is the filter waste produced after acid leaching manganese ore ore powder in the production process of manganese products. At present, the stock of manganese slag in my country has exceeded 100 million tons. Manganese ore leaching slag is generally disposed of simply by damming and open-air stockpiling. Due to unsatisfactory control measures such as anti-leakage, etc., leachate is produced after rainwater leaching, and the concentration of manganese ions as the main pollutant is very high. The surrounding surface water, groundwater, river sediment, and soil cause serious pollution, endangeri...

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Problems solved by technology

[0010] From the above retrieval results, it is known that the public literature mainly introduces: Document ① adopts calcium oxide or sodium hydroxide to solidify manganese slag, and the treatment effect is good, but the amount of curing agent is large, and the residue is alkaline, which is not conducive to efflux; Document ② Using calcium oxide alkalization, silicate dispersion, water-soluble resin sulfonate additive hydration, iron chloride oxidation and other steps to recover ammonia, solidify manganese, manganese exists in the form of insoluble tetravalent manganese ions, but the process flow of this method long, complex process, and high cost; document ③ adopts the method of oxidizing divalent manganese ions, selenite and iron-containing, aluminum oxides to form insoluble complexes to solidify manganese slag, the process is complicated, the cost is too high, and ball milling increases the energy Document ④ solidifies water-soluble manganese in manganese slag by adding calcium oxide and sodium phosphate. The process is simple, but sodium phosphate is used to form double salt with ammonia and manganese, which will release ammonium ions under acidic conditions and affect the curing effect; document ⑤ Using high-temperature roasting to fix manganese for desulfurization, high temperature needs to burn a large amount of coal to provide heat, which increases energy consumption and inevitably produces a large amount of coal-burning smoke, causing air pollution

[0011] In summary, the curing process reported in the existing literature is generally expensive, and the use of some methods will bring secondary pollution

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