Method of preparing iron oxide red from specularite

Abstract

The invention provides a method of preparing iron oxide red from specularite, which comprises the following steps: 1, specularite raw ore is crushed to below 15 mm to obtain fine-particle ore; 2, theobtained ore with the size smaller than 15 mm is subjected to stage grinding-stage magnetic separation, magnetic separation concentrate with the iron oxide grade being 92% or above is obtained, and the magnetic separation concentrate enters a flotation tank to be subjected to reverse flotation; 3, primary ultrafine grinding is carried out on the obtained flotation concentrate, and the material subjected to ultrafine grinding is dehydrated and dried and mixed with a certain amount of modifier for mixing, calcining and modifying; and 4, ultrafine grinding on the obtained modified material againis carried out to obtain the iron oxide red product with excellent performance. Compared with iron oxide red prepared through a traditional synthesis method, the method provided by the invention has the advantages that after natural minerals are purified, mechanical ball milling and chemical modification are conducted, the obtained product is more resistant to acid and alkali, the pigment performance completely meets the national standard, and pollution to the environment in the whole process is small.

Description

technical field [0001] The invention relates to the technical field of purifying and preparing pigments, in particular to a method for preparing iron oxide red from specularite. Background technique [0002] Iron oxide pigment is the second largest inorganic pigment after titanium white pigment, and also the largest color inorganic pigment. Iron oxide red (α-Fe 2 o 3 ) is the largest and most complete variety of iron oxide pigments. According to the production process, it can be divided into natural iron oxide red and synthetic iron oxide red. At present, 70% of the iron oxide red on the market is produced by synthetic methods, mainly dry and wet methods. The dry methods include green vitriol (ie, ferrous sulfate heptahydrate) calcination method, iron yellow calcination method, iron black calcination method, etc. , the quality of the products produced by it is poor, and the calcination flue gas pollutes the environment; the wet method uses ferrous sulfate or ferrous nitr...

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a method for preparing iron oxide red from specularite, which solves the problems of waste acid waste water polluting the environment and the like in the production process of the existing iron oxide red synthesis method and the iron oxide produced in the natural iron oxide red production process. The red product has poor performance and high impurity content. The whole production process is stable and the indicators are excellent. The obtained iron oxide red product meets the national standard (GB1863-89)

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