Novel neutralization process in preparation process for electrolytic manganese dioxide

Abstract

The invention discloses a novel neutralization process in a preparation process for electrolytic manganese dioxide. The novel neutralization process comprises the following steps: mixing manganese carbonate ore powder particles and concentrated sulfuric acid in a weight ratio of 1: (0.5 to 0.65), and obtaining ore pulp containing manganese sulfate and having a pH value of greater than 2 after heating, stirring and carrying out manganese leaching for 8h; then adding manganese oxide ore powder in the ore pulp containing manganese sulfate to remove impurities potassium and iron; then adding a neutralizer and carrying out secondary pressing-filtering; adding a vulcanizing agent in manganese sulfate solution to settle heavy metals, carrying out tertiary pressing-filtering, then adding a molybdenum removal additive and carrying out quartus pressing-filtering to obtain manganese sulfate filtrate; and finally carrying out static settlement and filtering on the manganese sulfate filtrate, taking the solution and carrying out electrolysis to obtain a manganese dioxide product and a waste solution. The novel neutralization process disclosed by the invention is capable of ensuring the quality of the product, greatly lowering a production cost, and increasing economic benefits, and high in market promotion value.

Description

【Technical field】 [0001] The invention belongs to the field of electrolytic manganese dioxide preparation technology, in particular to a novel neutralization process in the preparation process of electrolytic manganese dioxide. 【Background technique】 [0002] Electrolytic manganese dioxide is an important chemical product and an important chemical raw material, which can be used in the preparation of medicine, papermaking, battery raw materials and other manganese salts. Electrolytic manganese dioxide uses manganese ore as raw material, and the high-grade manganese ore resources in the current market are exhausted, while the traditional preparation process of electrolytic manganese dioxide using low-grade manganese ore as raw material has the problem of low utilization rate. Therefore, some researchers use magnetic separation to increase the content of manganese concentrate to increase the utilization rate and yield of manganese ore. The disadvantage is that a large amount o...

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Problems solved by technology

Electrolytic manganese dioxide uses manganese ore as raw material, and the high-grade manganese ore resources in the current market are exhausted, while the traditional preparation process of electrolytic manganese dioxide with low-grade manganese ore as raw material has the problem of low utilization rate

Therefore, some researchers use magnetic separation to increase the content of manganese concentrate to increase the utilization rate and yield of manganese ore. The disadvantage is that a large amount of magnetic separation tailings are directly turned into waste slag and buried in the manganese slag bank, resulting in a waste of manganese resources and reducing Mn recovery

In addition, some researchers use the two-mine acid leaching method to add manganese ore with high manganese content to the low-grade manganese ore raw material to supplement the manganese content of the raw material. In the neutralization process of the two-mine acid leaching method, carbonic acid is generally used. Calcium powder or lime-containing slurry is used for neutralization, there is a problem that the input of calcium carbonate is relatively large, resulting in an increase in the amount of slag, and the manganese liquid taken away in the slag will also increase accordingly; and if the slurry containing lime is used For neutralization, the lime in the slurry contains a large amount of alkaline substances, which will cause serious manganese precipitation, which will cause waste of manganese resources and further reduce the recycling rate of manganese.

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