Method for cooperatively extracting potassium and rubidium from potassium-containing rock

A potash rock and ore technology, applied in the field of mineral processing and hydrometallurgy, can solve the problems of poor economic benefit, low added value, single product, etc., and achieve the effects of less equipment, less impurities and easier technology

Active Publication Date: 2020-08-14
山西省岩矿测试应用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art such as high energy consumption, high cost, single product, low added value, serious environmental pollution, and poor economic ben

Method used

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  • Method for cooperatively extracting potassium and rubidium from potassium-containing rock
  • Method for cooperatively extracting potassium and rubidium from potassium-containing rock
  • Method for cooperatively extracting potassium and rubidium from potassium-containing rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The embodiment uses potassium-bearing shale and analytically pure CaO as raw materials. Among them, the potassium-containing rock samples come from the potassium-bearing sand shale mining area in Pingshun District, Changzhi City, Shanxi Province, and the analyzed pure CaO contains 98% of CaO. The results of chemical analysis of the ore are shown in Table 1.

[0065] Table 1 Main composition and content (%) of potassium-bearing rock ore

[0066] components SiO 2

K 2 o

CaO Na 2 o

TF Al 2 o 3

MgO TiO 2

Rb 2 o

content% 66.26 10.48 1.44 0.081 1.78 14.01 1.12 0.48 0.022

[0067] Specific steps include:

[0068] Step 1: crush 500 grams of potassium-containing rock, add 400 milliliters of water and grind in a ball mill for 15 minutes, filter, and dry to obtain a potassium-containing rock sample passing through a 200-mesh sieve;

[0069] Step 2: Take 50 grams of potassium-containing rock samples, add 70 g...

Embodiment 2

[0074] Example 2: Effect of molten salt thermal activation temperature on potassium activation rate and rubidium leaching rate

[0075] The steps of the method described in Example 1 are adopted, but the reaction temperatures of thermal activation of molten salt in step 2 are adjusted to 160°C, 200°C, 240°C, 260°C and 280°C respectively, and tests are carried out at different reaction temperatures. For the results, see figure 2 .

[0076] From figure 2 It can be seen that as the temperature increases, the effective potassium activation rate and rubidium leaching rate increase gradually. The higher the temperature, the more intense the reaction. At 260°C, the effective potassium activation rate is 91%, and the rubidium leaching rate is 42%. The rate of activation then slows down. Excessively high temperature requires high equipment materials and consumes a lot of energy. Considering comprehensively, the optimum temperature is selected as 260°C.

Embodiment 3

[0077] Example 3: Effect of molten salt thermal activation reaction time on potassium activation rate and rubidium leaching rate

[0078] Using the steps of the method described in Example 1, set the reaction temperature of thermal activation of molten salt to be 260°C, but adjust the reaction time of thermal activation of molten salt in step 2 to 1h, 2h, 3h, 4h, 5h and 6h respectively. Experiments were carried out under different reaction times, and the results can be found in image 3 .

[0079] From image 3 It can be seen that the activation rate of effective potassium and the leaching rate of rubidium increase with the increase of time, and remain basically unchanged with the extension of reaction time after 4 hours. The hydrothermal system has complex phases. In order to save costs, reduce energy consumption, and avoid side reactions, the time should not be too long. The optimal reaction time is 4 hours.

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Abstract

The invention relates to the field of mineral processing and wet metallurgy, in particular to a method for cooperatively extracting potassium and rubidium from potassium-containing rock. The method comprises the following steps: crushing and grinding potassium-containing rock to obtain mineral powder; mixing the potassium-containing rock with the alkaline additive quick lime or slaked lime, addingwater to obtain a mixture, and placing the mixture in a molten salt furnace to activate the mixture through heat of fused salt; carrying out solid-liquid separation on the activated mixture to obtainfiltering liquid and filtering residue containing potassium and rubidium, wherein the filtering residue is used for producing silicon and calcium fertilizer; adding potassium carbonate aqueous solution in the filtering liquid for carbonization, and filtering to remove impurities to obtain secondary filtering liquid; carrying out evaporative crystallization on the secondary filtering liquid to obtain potassium and rubidium crystal substances; and roasting the potassium and rubidium crystal substances to contain potassium and rubidium containing enriched product, and carrying out purification and separation to obtain potassium carbonate and rubidium carbonate. Lime is adopted as the alkaline additive, the solid-liquid separation filtering liquid is alkaline, calcium ions precipitate to enter tailings, and the tailings are used for preparing silicon and calcium fertilizer. Compared with adoption of sodium hydroxide as the alkaline additive, the cost is lower, and the potassium and sodiumseparation process is eliminated in filtering liquid to facilitate purification of potassium and rubidium.

Description

technical field [0001] The invention relates to the fields of mineral processing and hydrometallurgy, in particular to a method for synergistically extracting potassium and rubidium from potassium-containing rocks. Background technique [0002] my country's water-soluble potassium salt resources are poor, and the dependence on potash fertilizer imports has been above 50% over the years. Water-insoluble potassium ore (potassium-containing rocks) is rich in resources, and a large number of researches on potassium extraction have been carried out at home and abroad, and the acid method, limestone sintering method, sodium carbonate sintering method and other processes have been developed successively to realize the extraction of potassium, but there are Due to problems such as high energy consumption, high cost, single product, low added value, and poor economic benefits, it has not been applied on a large scale. [0003] Rubidium is an extremely important rare metal resource w...

Claims

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Application Information

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IPC IPC(8): C22B26/10
CPCC22B26/10Y02P10/20
Inventor 何瑞明王勇李爱民史伟李诚许亚军
Owner 山西省岩矿测试应用研究所
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