Method for by-producing porous silicon dioxide, aluminum hydroxide and ferrite yellow from middle and low grade ferro-sulphur ore

Abstract

The invention relates to a method for coproducing porous silicon dioxide, aluminum hydroxide and ferrite yellow when producing medium and low grade sulfurous iron ores, which comprises: the sulfurous iron ores are crushed and directly enter a fluidized bed furnace for roasting to obtain sulfur dioxide gas and cinder; the sulfur dioxide gas is used for further producing sulfuric acid or reducing production of sulfur; the cinder is subjected to magnetic separation to obtain iron concentrate or directly added with a chemical additive and then subjected to grinding and heating reaction, wherein the addition of the chemical additive is 2 to 4 times of the weight of the cinder; the cinder is dissolved for 1 to 3 hours under the acid condition after heating reaction, and the porous silicon dioxide is obtained after filtration and separation; the pH value of filtrate is adjusted to be between 9 and 12, the filtrate stands and is filtrated, and filter residue ferric hydroxide is washed and roasted to obtain a high-purity ferrite yellow pigment; and the pH value of the filtrate for filtrating the ferric hydroxide is adjusted to be between 4 and 6.5, the filtrate stands and is filtrated and separated to obtain aluminum hydroxide, and the aluminum hydroxide finished product is obtained after washing and drying the aluminum hydroxide. The method can improve the sulfur utilization rate by 40 to 50 percent, solves the problem of environmental pollution in the prior art, and fully utilizes all the compositions coproduced with the medium and low grade sulfurous iron ores.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for comprehensive utilization of middle and low-grade pyrite to produce porous silicon dioxide, aluminum hydroxide and iron yellow by-product. Background technique [0002] my country is rich in pyrite resources, accounting for 10% of the world's total reserves, ranking third, but most of them are of medium and low grades. Rich ore (≥35%) only accounts for about 4% of the total reserves, and the average geological grade is 17.68%. Pyrite is the main sulfur resource in my country, accounting for 80% of the total sulfur resources; in the total pyrite resources, single pyrite accounts for 53%, and associated pyrite accounts for 27%. [0003] Pyrite deposits in the Liupanshui Economic Zone of my country are produced in the Upper Permian coal-bearing rock series, and the upper part of the rock series is coal-bearing deposits of marine-terrestrial alternating facies; the lo...

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Problems solved by technology

[0005] The main beneficiation method for producing sulfur concentrate from pyrite is flotation, followed by gravity separation, magnetic separation or flotation-magnetic combined separation; according to statistics, 15% to 30% of the pyrite in the tailings has not been selected, and the production 1 ton of sulfur fine sand requires 3 to 3.5 tons of raw ore, 10 to 15 tons of water, generally produces 2 to 2.5 tons of waste residue, and 12 tons of waste water. The sulfur content of tailings is often above 7%, and the utilization rate of sulfur resources is less than 58%. Iron ore tailings are actually high-titanium, iron-containing pyrite kaolinite clay rocks that coexist with pyrite. It can be seen that the content of kaolinite in the tailings is nearly 90%, which is an important renewable resource available for use. Utilization not only wastes a lot of precious resources, but also has no power to deal with a large amount of tailings, which has caused serious harm to the local ecological environment, industrial and agricultural production, and people's health, and caused serious pollution to the surrounding waters and other environments.

The production of sulfur concentrate from pyrite has a single product, a short industrial chain, and comprehensive utilization of resources, which not only loses the benefits of mineral resources but also causes serious pollution to the local environment. Serious; the slag used to make sulfuric acid is currently only recovered by magnetic separation and some iron has not been comprehensively utilized

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