Process for producing anhydrous chromium chloride and chromium oxide green from ferrochrome through boiling chlorination

Abstract

The invention discloses a process for producing anhydrous chromium chloride and chromium oxide green from ferrochrome through boiling chlorination, belonging to the technical field of production methods for chromium salts. The process comprises the following steps: crushing ferrochrome and a heat supplementing agent, fully mixing the crushed ferrochrome with the crushed heat supplementing agent inproportion, adding the obtained mixture into a boiling chlorination furnace, introducing chlorine for a chlorination reaction with a temperature maintained at 850 to 1050 DEG C so as to produce anhydrous chromium chloride and iron chloride, and separating chromium chloride from iron chloride by controlling the temperature of a condenser; and refining and purifying chromium chloride so as to obtain purified chromium chloride used as a chromium-series chemical raw material, or calcining chromium chloride at a high temperature of 950 to 1100 DEG C to produce chromium oxide green. The process provided by the invention fundamentally changes conventional production process routes for chromium salts, shortens process flow, improves product quality, reduces production and manufacturing cost, doesnot produce Cr<6+> in the whole production process, thoroughly overcomes the problem of pollution caused by Cr<6+>, completely meets national industrial policies in China, is a typical novel clean production process and is easy to promote and apply.

Description

technical field

[0001] The invention relates to the technical field of production methods of chromium salts, in particular to a process for producing anhydrous chromium chloride and chromium oxide green by ferrochromium boiling chlorination. Background technique

[0002] At present, the anhydrous chromium trichloride is prepared by reacting dichromium trioxide with chlorine and carbon at high temperature. This method has the disadvantages of long process flow, high manufacturing cost, low quality, and the presence of Cr 6+ Pollution and other disadvantages. Chromium trioxide is produced by oxidation roasting, leaching, acidification, crystallization, and drying of chromite ore to produce anhydrous red bauxite sodium, and then react with sulfuric acid to produce chromic anhydride, which is then calcined at high temperature; or chromite ore is oxidized and roasted 1. Sodium chromate solution is obtained by immersion in water, and sulfur is added to reduce and precipitate chro...