Technique for manufacturing tetrahydrate manganese chloride low ore grade rhodochrosite absorption of chlorine containing waste gas

A technology of manganese chloride tetrahydrate and rhodochrosite, applied in the direction of manganese halide, etc., can solve the problem of chlorine-containing waste gas pollution and effective utilization of low-grade rhodochrosite, and achieve the effect of improving the absorption rate

Inactive Publication Date: 2008-07-16
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention uses low-grade rhodochrosite as the main raw material, effectively extracts the manganese element therein through absorption reaction, filtration and crystallization with chlorine-containing waste gas, and properly controls the process conditions such as reaction time, reaction te

Method used

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  • Technique for manufacturing tetrahydrate manganese chloride low ore grade rhodochrosite absorption of chlorine containing waste gas
  • Technique for manufacturing tetrahydrate manganese chloride low ore grade rhodochrosite absorption of chlorine containing waste gas
  • Technique for manufacturing tetrahydrate manganese chloride low ore grade rhodochrosite absorption of chlorine containing waste gas

Examples

Experimental program
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Effect test

Embodiment 1

[0099] Embodiment 1: Get 320 grams of low-grade rhodochrosite (containing 17.25% manganese, passing through 80 meshes) and 1.6 liters of water to be mixed with ore slurry, and absorb chlorine-containing waste gas for 2 hours at 90° C., and obtain MnCl after cooling 2 4H 2 1.45 liters of O solution; after the reaction, adjust the pH value to 3 to remove iron, then filter, add an appropriate amount of manganese sulfate powder (according to the concentration of calcium and magnesium ions to determine the addition amount) in the filtrate, stir and purify for half an hour, and let it stand for 4-6 hours , generate a white precipitate, filter, and the filter cake is the by-product CaSO 4 and MgSO 4 ; Add metal manganese powder to the filtrate and stir and purify at 60-80°C for half an hour to form heavy metal precipitates, filter to remove impurities; then add BaCl quantitatively to the filtered solution 2 , stand still, filter, remove excess SO 4 2- ; Finally, the filtrate afte...

Embodiment 2

[0100] Embodiment 2: Get 320 grams of low-grade rhodochrosite (containing 22.35% manganese, pass 160 mesh) and 1.0 liters of water to be mixed with ore slurry, and absorb chlorine-containing waste gas circulation for 2 hours at 85 ° C, and obtain MnCl after cooling 2 4H 2 1.08 liters of O solution; after the reaction, adjust the pH value to 3 to remove iron, then filter, add an appropriate amount of manganese sulfate powder (according to the concentration of calcium and magnesium ions to determine the amount added) to the filtrate, stir and purify for half an hour, and let it stand for 4-6 hours , generate a white precipitate, filter, and the filter cake is the by-product CaSO 4 and MgSO 4 ; Add metal manganese powder to the filtrate and stir and purify at 60-80°C for half an hour to form heavy metal precipitates, filter to remove impurities; then add BaCl quantitatively to the filtered solution 2 , stand still, filter, remove excess SO 4 2- ; Finally, the filtrate after p...

Embodiment 3

[0101] Embodiment 3: Get 320 grams of low-grade rhodochrosite (22.35% manganese, pass 100 mesh) and 2.2 liters of water to be mixed with ore slurry, and absorb chlorine-containing waste gas circulation for 3 hours at 65 ° C, and obtain MnCl after cooling 2 4H 2 O solution 2.11 liters; after the reaction, adjust the pH value to 3 to remove iron, then filter, add an appropriate amount of manganese sulfate powder to the filtrate and stir and purify for half an hour, let it stand for 4-6 hours, a white precipitate is formed, filter, and the filter cake is a by-product CaSO 4 and MgSO 4 ; Add metal manganese powder to the filtrate and stir and purify at 60-80°C for half an hour to form heavy metal precipitates, filter to remove impurities; then add BaCl quantitatively to the filtered solution 2 , stand still, filter, remove excess SO 4 2- ; Finally, the filtrate after purification and removal of impurities is heated, evaporated and crystallized to obtain solid MnCl 2 4H 2 O p...

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Abstract

The invention discloses a process for preparing manganese chloride tetrahydrate by absorbing waste gas containing chlorine by low-taste rhodochrosite. Powder of the low-taste rhodochrosite is prepared to be ore pulp with water; the ore pulp carries out absorption reaction with the waste gas containing the chlorine; the obtained ore pulp is carried out filtration; manganese sulfate powder and metal manganese powder are sequentially added in the filtrate to carry out the purification and the filtration; after the filtrate is evaporated and crystallized, solid MnCl2 4H2O product is obtained. Compared with the prior art, the invention has simple technological process and is convenient to operate. The invention solves the problem of treating the waste gas containing the chlorine, makes full use of the oxidizability without adding oxidant and can also highly effectively use a large amount of low-taste rhodochrosite resource which is difficult to use, which realizes sustainable utilization of resources and reutilization of secondary resources and has good application prospect in industry. By adopting ways of displacement of the metal manganese powder and reduction of the manganese sulfate when purifying and eliminating heavy metals, the invention not only has obvious effect but also reduces secondary pollution to the product and saves process of secondary impurity removal.

Description

Technical field: [0001] The invention relates to a process for preparing manganese chloride tetrahydrate by absorbing chlorine-containing waste gas from low-grade rhodochrosite, belonging to the fields of manganese ore processing technology and environmental protection. Background technique: [0002] my country's manganese ore resources are extremely scarce. As of 2005, my country has identified 295 manganese ore origins, with a total of 746 million tons of manganese ore resource reserves (including 215 million tons of basic reserves and 530 million tons of resources), accounting for 23.6 billion tons of manganese ore in the world. of 3.2%. However, my country's manganese deposits have the characteristics of small scale, low grade, high impurity content, and uneven distribution. At the same time, manganese-poor ores with high silicon, high phosphorus, and high iron account for a large proportion. These ores have complex structures, fine particle sizes, and are difficult to se...

Claims

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Application Information

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IPC IPC(8): C01G45/06
Inventor 唐道文李军旗毛小浩王芹杨双全赵平原黄碧芳王海峰路坊海
Owner GUIZHOU UNIV
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