Pyrite cinder separation, recovery and recycling method

A pyrite slag, separation and recovery technology, applied in chemical instruments and methods, magnesium sulfate, iron oxide and other directions, can solve the problems of increasing the cost of waste residue separation, difficult to separate water-soluble salt mixture, and difficult separation and recovery of waste residue.

Inactive Publication Date: 2016-10-05
耿兆翔
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  • Abstract
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  • Application Information

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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 sul

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  • Pyrite cinder separation, recovery and recycling method

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Embodiment

[0110] 1. Soak pyrite slag, i.e. sulfuric acid slag, with sufficient water, and stir at a speed of 30-50 rpm for 1-2 hours to convert the alumina and calcium oxide in the sulfuric acid slag into hydrated Aluminum oxide, calcium hydroxide, and become suspension emulsion, stand still, make ferric oxide or / and ferrous oxide, magnesia, silicon dioxide, a small amount of aluminum oxide, sulfur (comprising elemental sulfur and iron disulfide FeS 2 ), apatite (calcium phosphate), magnesium phosphate, calcium sulfate and trace copper oxide, lead oxide, zinc oxide, cobalt oxide, gold and silver oxide and other trace metal elements or mixtures of their oxides are immediately precipitated and separated; at the same time Separation of hydrated alumina and calcium hydroxide suspension emulsion; in this step, the water is recycled, and the pyrite slag, namely sulfuric acid slag, is soaked in multiple cycles, and most of the hydrated alumina and all calcium hydroxide are separated by precipit...

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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 ...

Claims

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Application Information

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IPC IPC(8): C01F11/18C01F7/02C01F11/02C01F11/46C01F7/74C01F5/30C01F5/40C01F5/02C01G49/06C01G49/02C01G51/04C01G5/00C01G3/02C01B25/32C01B21/02B09B3/00
Inventor 耿兆翔
Owner 耿兆翔
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