Process for preparing chromic anhydride and dichromate by carbon ferrochrome liquid phase method

Abstract

The invention relates to a process for preparing chromic anhydride and dichromate by a carbon ferrochrome liquid phase method and belongs to the technical field of preparation of chromic compounds, ferrum-series pigments, silicone new materials, photovoltaic new materials and new-energy chemical-industry new materials from industrial metallurgical products. The process disclosed by the invention is advanced, energy-saving and environment-friendly and is free of emission of waste residues, waste gases and waste water. Products such as the chromic compounds, the pigments, new energy sources and new-energy-source silicon-carbon battery materials are produced from ferrochrome by a liquid phase method in one time without high pressure and high temperature, so that a series of novel high-end industry chains are formed, and the original situation that the ferrochrome is single in use and pure in production is thoroughly changed; the out-of-date production process that heavy pollution generated by the original chromate compound roasting production heavily harms environment is changed, and the production of chromic anhydride, dichromate and the chromic compounds can be in a energy-saving, environment-friendly and high-benefit development path; and the field of diversified development and application of ferrochrome industry is extremely extended, the international competitiveness of enterprises is greatly enhanced, and the optimized upgrading and developing of national industries are promoted, so that the process is of far reaching importance. The process meets the modern requirements on environment-friendly development of economy and has very good enterprise economic benefit, perfection benefit and social benefit.

Description

technical field [0001] The invention relates to a process for preparing chromic anhydride and dichromate by a carbon ferrochrome liquid phase method, which belongs to the new chemical material for producing chromic anhydride, dichromate, iron-based pigments, new silicon materials and new energy sources using metallurgical products as raw materials technology field. Background technique [0002] With the acceleration of international economic integration, the competition of enterprises is becoming increasingly fierce. To survive and develop in the fierce international competition, enterprises must adjust and optimize the industrial structure, change the mode of economic development, accelerate the elimination of backward production capacity, and guide and promote resources to advantage The gathering of industries and high-tech promotes the optimization and upgrading of my country's industrial structure. Enterprises should increase investment in research and development from a...

AI Technical Summary

Problems solved by technology

[0005] At present, chromium salt enterprises at home and abroad are completely using calcium or less calcium roasting methods to produce chromate, as well as the chromium salt production technology that is being trial-produced and promoted in China: sodium chromate produced by alkali-dissolving oxidation of ferrochrome, pneumatic fluidized tower continuous Liquid-phase oxidation method for chromate, potassium or sodium sub-molten salt liquid-phase oxidation method for chromate production requires high temperature and high pressure, excessive sodium or potassium alkali consumption, high cost of reaction vessel, difficult manufacturing, high production cost, low profit or loss, difficult to industrialize production

The production process produces a large amount of chromium slag, which is costly and difficult to deal with, which seriously restricts the development of enterprises and industrial upgrading

[0006] Chongqing Minfeng Chemical Co., Ltd., a large chromate manufacturer in Asia, "Process for preparing soluble chromate by three-phase catalytic oxidation", application number: 201110261747.9, publication number: CN102320661.A, publication date: 2012.01.18, this method High temperature and high pressure are required, a large amount of alkali is required in the production process, the requirements for container material, design, and reaction conditions are extremely high, the cost of the reaction container is high, the damage to the container is large during the production process, and it is easy to cause safety hazards

Due to the high production cost, there is only a single product, sodium chromate, and at the same time, the toxic chromium slag is difficult to deal with, and it is difficult to industrialize production