Pyrite cinder separation, recovery and recycling method

Abstract

The invention discloses a pyrite cinder separation, recovery and recycling method and belongs to the technical field of an inorganic chemistry industry. The method comprises carrying out suspended separation on calcium hydroxide and alumina through water, dissolving and separating alumina through an ammonium salt, dissolving iron sesquioxide / ferrous oxide in the pyrite cinder through strong phosphoric acid, filtering to separate the mixture of sulfur, phosphorus and silica insoluble with strong phosphoric acid from iron sesquioxide / ferrous oxide, and separating and recovering resource materials such as iron sesquioxide / ferrous oxide and alumina or aluminum hydroxide. The separated product can be used for an industrial raw material and agricultural fertilizer.

Description

Technical field: [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a method for separation, recovery and regeneration of pyrite slag. Background technique: [0002] Pyrite produces sulfuric acid, and every ton of sulfuric acid produced will produce 0.8-0.9 tons of pyrite slag (sulfuric acid slag). The annual discharge of pyrite slag in my country is as high as 3 million tons, and the output of waste residue is huge. Since most of the pyrite mines in our country are lean ores, the sulfur content in the sulfuric acid slag is too high, the iron oxide and ferrous oxide content is mostly below 55%, and the content of impurities such as silicon dioxide is too high, so only 100% of the sulfuric acid slag is directly recycled every year. About 10,000 tons, only 5%--10% is added to iron ore to make iron, which has caused serious waste of resources, environmental pollution and waste of land occupation. Therefore, from the perspective ...

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Problems solved by technology

[0003] The chemical reaction with hydrochloric acid or sulfuric acid not only changes the original material form of ferric oxide, ferrous oxide, aluminum oxide, calcium oxide and magnesium oxide in the waste residue, but also consumes a large amount of hydrochloric acid or sulfuric acid, which greatly increases the cost of waste residue separation At the same time, a water-soluble salt mixture that is difficult to separate is produced; especially with sulfuric acid reaction, pyrite produces sulfuric acid to produce waste residue, and in order to separate waste residue, sulfuric acid is consumed. The amount of pyrite waste residue is too large. As an important industry Raw sulfuric acid lost its source

Due to technical bottlenecks, my country's sulfuric acid industry is facing a dilemma: producing pyrite, the waste residue is difficult to separate and recycle; producing sulfur (S) ore, with limited resources, which cannot meet the development needs of my country's sulfuric acid industry

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