Process for preparing chrome green by using K3 raffinate and sulfur method

Abstract

The invention discloses a process for preparing chrome green by using K3 raffinate and a sulfur method. The process comprises two sections. The first section comprises the following steps: with neutral leaching yellow water or sodium chromate alkaline solution as a raw material in a workshop, adding liquid alkali in proportion to adjust alkalinity, carrying out heating to a certain temperature onan electric furnace, adding levigated sulfur paste, and carrying out curing for a period of time after completion of a pre-reaction; carrying out filtration and washing successively, wherein the content of Na2S2O3 in the last washing is ensured; and drying a filter cake, then calcining the dried filter cake in a muffle furnace to obtain crude chrome green, and subjecting the crude chrome green towashing and drying to obtain metallurgical-grade chrome green. The second section comprises the following steps: after complete reaction of chromium hydroxide, mixing a filtrate with primary washing water; adding the sodium chromate alkaline solution, carrying out heating and stirring, and then adding K3 raffinate at a certain temperature to adjust a pH value; carrying out curing for a certain period of time, carrying out filtering and measuring the content of Na2S2O3 in the obtained filtrate; then carrying out filtering, and leaching and roasting the obtained filter cake; and subjecting a semi-finished chrome green product to washing, drying and levigation so as to obtain the pigment-grade chrome green. The process provided by the invention solves problems in treatment of K3 raffinate, makes full use of the reducibility of Na2S2O3, and basically has no influence on the environment.

Description

Technical field [0001] The invention relates to a process for preparing chrome green by a K3 residual liquid sulfur method. Background technique [0002] At present, the main production process route of major domestic manufacturers of chrome green is chromium salt reduction decomposition method or chromic anhydride direct decomposition method. The production process and control are relatively simple. Most manufacturers, especially small and medium enterprises, have not yet formed economies of scale. The quality of the products is low, the production cost is high, the specifications are not complete, the technology is backward, and the market competitiveness is weak, resulting in insufficient overall product quality. [0003] In addition, most manufacturers do not have their own intellectual property rights, and they lack systematic analysis, testing, and basic research, and they are blind in improving processes and technology. [0004] The current problems facing the industry mainly...

AI Technical Summary

Problems solved by technology

[0008] The present invention intends to provide a process for preparing chrome green by the sulfur method of K3 raffinate, which not only solves the problem of disposal of K3 raffinate, but also makes full use of the reducing property of Na2S2O3, and basically has no impact on the environment.