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

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...

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 temperature, liquid-solid ratio and manganese ore particle size to prepare MnCl 2 4H 2 O products play an important role in solving the problem of chlorine-containing waste gas pollution and the effective utilization and development of low-grade rhodochrosite in my country at the present stage.

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