Method for processing potassium-containing rocks

Abstract

The invention discloses a method for processing potassium-containing rocks, which mainly comprises: coarsely and finely crushing the potassium-containing rocks to 100 to 200 meshes; and adding the potassium-containing rocks to fluosilicic acid according to a ratio to react the potassium-containing rocks with fluosilicic acid fully to obtain a mixed material containing potassium fluosilicate, aluminium fluosilicate and silica gel. In the invention, the fluosilicic acid is used alone to decompose the potassium-containing rocks, the fluosilicic acid and ore powder are fed into a reaction kettle in turn under a stirring condition, the reaction kettle is heated to 110 to 170 to allow the reactants to react fully, the reaction time is 1 to 3 hours, the fluosilicic acid suspension is reserved and subjected to subsequent chemical processing, acidification is performed, and the fluosilicic acid is reclaimed. Compared with the conventional mixed acid method, the method can process 1 ton of potassium-containing rock raw material by using 0.2 ton of coal containing 5,000 large calories of heat; and compared with the method of evaporating the mixed acid to dryness, the method can save 60 to 80percent of energy consumption and reduce processing time by 4 to 6 folds.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of non-metallic ores, in particular to a method for processing potassium-containing rocks. Background technique [0002] Potassium-containing rocks are the most common rock-forming minerals in the earth's crust, including feldspar, mica, nepheline and other minerals and rocks such as shale. They all have a stable Si-O tetrahedral structure and are generally water-insoluble. It also shows a high melting point and thermal stability. Generally, it starts to melt when the temperature reaches 1300°C-1500°C, and it changes the ore structure to decompose elements contained in potassium-containing rocks when it reaches 1600°C-1800°C. [0003] As a method of opening potassium-containing rocks to achieve the purpose of extracting useful elements, it is generally considered to choose a suitable solvent to heat together with it to reduce the decomposition temperature of potassium-containing rock miner...

AI Technical Summary

Problems solved by technology

The stable structure of potassium-containing rock minerals can only be decomposed at high temperatures. This point has reached a consensus. The methods that have been formed have been using high-temperature sintering methods, such as carbonate calcination decomposition method, limestone and gypsum pyrolysis method, and slaked lime pressurization. Leaching method, sodium chloride high-temperature leaching method, dolomite and phosphate rock roasting to produce compound fertilizer, but most of these methods have some technical and economic problems, such as large energy consumption, low yield, low product content, process Complicated etc.

[0006] The method of low-temperature catalytic decomposition of potassium-containing rock minerals is a process proposed in recent years to use mixed acid to decompose potassium-containing rock minerals. The catalyst is recovered through water absorption. The biggest problem is that the amount of catalyst used is large and evaporation is required. recovery method, consumes a lot of energy, and the volume of the absorption equipment is relatively large

[0007] Publication number is CN1557781A Chinese invention patent "low temperature decomposition method of potassium feldspar", discloses a method for utilizing mixed acid to decompose potassium feldspar, which adopts mixed acid of fluosilicic acid and sulfuric acid to decompose potassium feldspar, is Evaporate fluosilicic acid to dryness under the condition of sulfuric acid, and use the high boiling point of sulfuric acid to evaporate fluosilicic acid to dryness, all of which are converted into silicon tetrafluoride and enter the absorption tower to recover fluosilicic acid and silicic acid. Generally, the evaporation time is more than 8 hours. It requires a lot of energy consumption. About every ton of potassium feldspar is processed, theoretically, it needs to consume 0.7 tons of coal with a calorie content of 5,000 kcal, but in fact, it needs to consume 1.0 ton of coal with a calorie content of 5,000 kcal, which increases production costs. And its treatment process is very cumbersome, and the benefit is low

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