2results about How to "Reduce manganese content" patented technology

The invention belongs to the technical field of manganese slag treatment, and provides a method for preparing heavy manganese carbonate from manganese slag washing water based on a microreactor. The method comprises the following steps: mixing manganese slag washing water and an additive, and carrying out solid-liquid separation to obtain filter residues and filtrate; and mixing the filtrate and the alkali liquor to obtain a manganese ion solution, and respectively introducing the manganese ion solution and carbon dioxide mixed gas into the microreactor for reaction to obtain the heavy manganese carbonate. The manganese slag washing water and the carbon dioxide react in the microreactor, and the pH value of the manganese ion solution, the flow of the manganese ion solution and the carbon dioxide, the reaction temperature, the reaction pressure and the reaction time are controlled, so that the yield of manganese in the obtained heavy manganese carbonate is high, the purity is high, and the manganese content in the effluent filtrate is low; the obtained heavy manganese carbonate can be directly used as a raw material for electrolytic manganese metal, and the purposes of effective treatment of manganese residue washing water and comprehensive recycling of resources under mild conditions are achieved.

This invention discloses a low-manganese stainless steel material and its preparation method, belonging to the field of stainless steel materials. The method includes melting raw materials in a melting furnace to obtain stainless steel liquid and maintaining the temperature; sampling and analyzing the existing manganese content of the stainless steel liquid; calculating the required manganese-reducing agent content and adding it to the stainless steel liquid; thoroughly stirring to ensure the manganese-reducing agent is uniformly dispersed in the stainless steel liquid and fully reacts with the manganese in the stainless steel liquid to generate manganese-containing inclusions; repeatedly removing manganese-containing inclusions from the stainless steel liquid to pre-purify it; and then temperature-controlled cooling and casting the pre-purified stainless steel liquid to obtain the low-manganese stainless steel material. This invention can achieve efficient and controllable reduction of manganese content during the preparation of stainless steel materials, and has advantages such as simple process, short flow, low cost, and high efficiency. The prepared low-manganese stainless steel material has high quality and excellent comprehensive performance. It is particularly suitable for preparing low-manganese stainless steel materials from high-manganese stainless steel scrap.