Method for innocent treatment and comprehensive utilization of manganese slag

A technology of harmless treatment and manganese slag, applied in the direction of improving process efficiency, can solve the problems of incomplete precipitation, high recovery cost, low recovery rate, etc., and achieve less equipment investment, high recovery rate and good overall effect. Effect

Inactive Publication Date: 2010-04-07
湖南广义科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: the extraction of manganese has caused more serious ammonium nitrogen pollution, due to the presence of a large amount of ammonium salts, the precipitation is not complete, the recovery rate is low, and the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get 300 tons of electrolytic manganese plant leaching slag, wherein liquid content 30% (weight), manganese sulfate content 110g / L (Mn40g / L) in the described solution, ammonium sulfate content 120g / L, processing steps are as follows:

[0031] (1) Add water equivalent to 50% of the slag weight in the leaching slag, and then carry out continuous countercurrent washing by stirring and pulping, so that the manganese ion concentration in the slag washing water is 22g / L, and the ammonium sulfate is 70g / L, and then carry out solid-liquid separation , the content of manganese sulfate in the slag is 1.8g / kg, the content of ammonium sulfate is 1.8g / kg, and the total recovery rate is 93%. The filter residue is sent to make bricks, and the filtrate is sent to the preheater to be preheated to 80°C, and then sent to the reactor;

[0032] (2) In the reaction kettle, the filtrate is heated to 90°C, reacts with calcium hydroxide to generate calcium sulfate, ammonia gas and manganese hydro...

Embodiment 2

[0037] Get 300 tons of electrolytic manganese factory leaching slag, wherein liquid content is 30% (weight), manganese sulfate content 110g / L (Mn40g / L) in described solution, ammonium sulfate content 120g / L. The processing steps are as follows:

[0038] (1) Add water equivalent to 80% of the slag weight in the leached slag, and carry out three-stage countercurrent washing by stirring the slurry and cooperating with the filter press, so that the manganese ion concentration in the slag washing water is 15g / L, and the ammonium sulfate is at 45g / L. Then carry out solid-liquid separation, the content of manganese sulfate in the slag is 1.5g / kg, the content of ammonium sulfate is 1.5g / kg, the total recovery rate is 95%, the filter residue is sent to make bricks, and the filtrate is sent to the preheater to preheat to 80°C, and then sent to the reaction kettle;

[0039] (2) In the reactor, the filtrate is heated to 95° C., and reacts with calcium hydroxide to generate calcium sulfat...

Embodiment 3

[0044] Get 300 tons of electrolytic manganese factory leaching slag, wherein liquid content is 30% (weight), manganese sulfate content 110g / L (Mn40g / L) in described solution, ammonium sulfate content 120g / L. The processing steps are as follows:

[0045] (1) Add water equivalent to 100% of the slag weight in the leaching slag, and carry out three-stage countercurrent washing with a filter press through stirring pulping, so that the manganese ion concentration in the slag washing water is 11g / L, and the ammonium sulfate is at 35g / L. Then carry out solid-liquid separation, the manganese sulfate content in the slag is 1.4g / kg, the ammonium sulfate content is 1.4g / kg, the total recovery rate is 95.7%, the filter residue is sent to brick making, and the filtrate is sent to the preheater to preheat to 80°C, and then sent to the reaction kettle;

[0046] (2) In the reactor, the filtrate is heated to 75°C, and reacts with calcium hydroxide to generate calcium sulfate, ammonia gas and ...

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PUM

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Abstract

The invention provides a method for innocent-treatment and comprehensive utilization of manganese slag, which comprises the steps of: (1) washing and pressure-filtering the manganese slag, and separating manganese sulphate from ammonium sulphate which cause environmental pollution from leaching residue; (2) performing a reaction of slag washing water and a precipitator, ensuring that 5 to 10 percent of excessive precipitator is added, the reaction time is between 0.5 and 3 hours and the reaction temperature is between 30 and 100 DEG C, converting manganese ions in the slag washing water into manganese hydrate or manganese carbonate to precipitate the manganese ions, and then performing solid-liquid separation to realize the recovery of manganese; and (3) reacting a solution obtained by recovering the manganese and lime milk, wherein the reaction temperature is between 60 and 100 DEG C, reaction time is between 0.5 and 3 hours and reaction pressure is between 0 and 200mmHg, ensuring that the ammonium sulfate is converted into ammonia and calcium sulphate, absorbing the ammonia into ammonia water through an absorption device, filtering a solid-liquid mixture, separating out solid calcium sulphate, and recycling a filtrate in the slag washing process in the step (1). The method has the advantages of less equipment investment, low energy consumption and production cost, high recovery rate of valuable compositions and good comprehensive effect of innocent treatment of the manganese slag.

Description

technical field [0001] The invention relates to a method for the harmless treatment and comprehensive utilization of manganese slag, in particular to the harmless treatment of waste manganese slag produced in the hydrometallurgical process of manganese products such as electrolytic manganese metal, electrolytic manganese dioxide and manganese sulfate methods of processing and utilization. Background technique [0002] my country is a major producer of manganese products. Taking electrolytic manganese metal as an example, its annual production capacity has reached 2 million tons, and its actual annual output has reached 800,000 tons. As the grade of manganese ore is getting lower and lower, the metal manganese plant alone produces at least 6.8 million tons of manganese filter residue every year. The average liquid weight in the manganese slag after pressure filtration is calculated on the basis of the minimum 25%. The above-mentioned manganese slag takes away 1.7 million ton...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B3/46C22B47/00
CPCY02P10/20
Inventor 周启云夏纪勇
Owner 湖南广义科技有限公司
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