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Method for extracting soluble potassium by utilizing water-insoluble potassium ores

A water-insoluble and soluble technology, applied in the direction of improving process efficiency, can solve the problems of large equipment investment, slow decomposition rate, low potassium dissolution rate, etc., and achieve the effects of low roasting temperature, low production cost and low price

Active Publication Date: 2015-06-24
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the energy consumption is reduced, the equipment material requirements are high, and the technology is difficult to promote
(3) Autoclave method: the pressure is too high and the investment in equipment is large, so there is no industrial production so far
(4) Microbial decomposition method: a modern biological method that uses microbial strains and potassium feldspar to undergo biochemical reactions to decompose potassium feldspar. It has the characteristics of short process flow and low pollution, but its outstanding disadvantage is the viability of the strains Weak, the cycle of bacterial culture is too long, the decomposition rate is too slow, and the potassium dissolution rate is too low, making this method not mature enough for large-scale industrial production
However, in their experiments, the amount of additives is generally large

Method used

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  • Method for extracting soluble potassium by utilizing water-insoluble potassium ores
  • Method for extracting soluble potassium by utilizing water-insoluble potassium ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0017] 1) Selection of raw materials

[0018] The raw materials having the chemical composition shown in Table 1 were used. The mineral composition of potash 1 is mainly muscovite, potash feldspar and quartz, and the mineral composition of potash 2 is mainly potash feldspar and quartz, with a little albite.

[0019] Table 1 Chemical composition of raw materials (%)

[0020]

LOSS

SiO 2

Al 2 O 3

Fe 2 O 3

CaO

MgO

K 2 O

Na 2 O

Cl

Potash 1

3.89

56.88

16.62

7.51

0.14

2.10

9.47

0.18

0.008

Potash 2

0.48

64.61

18.29

1.16

1.02

0.44

10.65

2.75

0

Rock salt

N / A

0.21

0.14

0

0.04

0.06

0.04

48.00

52.625

Limestone

43.02

1.70

0.20

0.10

54.28

0.32

0.04

0.04

0.009

[0021] 2) Ingredients

[0022] Crush and grind potash 1, rock salt and limestone separately to an 80μm sieve residue of 10-40%, press certain (K + : Cl - : Ca 2+ 1) The ratio of the amount of the material is mixed and the mixing is ensured.

[0023] 3) Roasting

[0024] Weigh 30g of the mixture, put it in an alumina cruci...

Embodiment 6

[0033] 1) Selection of raw materials

[0034] The raw materials with the chemical composition in Table 1 were used.

[0035] 2) Ingredients

[0036] Crush and grind potash 2, rock salt and limestone to a 80μm sieve with 20% residue, according to the ratio of the amount of material (K + : Cl - : Ca 2+ )=1:4:0.8 for batching and ensure uniform mixing.

[0037] 3) Roasting

[0038] Weigh 30g of the mixture, put it in an alumina crucible and put it in a box furnace that is raised to a certain temperature in advance, and roast it for a certain period of time. After the roasting is completed, take out the sample to cool.

[0039] 4) Flooding

[0040] Weigh 5 g of the roasted product cooled to room temperature and transfer it to a beaker, add 100 ml of water to extract water-soluble potassium, filter, and analyze the potassium content in the filtrate with an atomic absorption spectrophotometer to calculate the potassium extraction rate.

[0041] 5) Separation

[0042] The filtrate mainly contains ...

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Abstract

The invention discloses a method for extracting soluble potassium by utilizing water-insoluble potassium ores. The method comprises the steps of: respectively crushing and grinding chloride and calcium raw materials as auxiliaries of water-insoluble potassium ores to 80mum, sieving 10%-40% of residues, mixing evenly, roasting for 30-180 minutes under the condition of 750-1000 DEG C, cooling the roasted product, then infiltrating and filtering with water, evaporating and crystallizing and separating the filtrate to obtain apotassium chloride product which can be used for producing potassium fertilizer. The filter residue can be used for producing cement, microcrystal galss, novel building material bricks and the like, and the water-insoluble potassium ore resources can be comprehensively utilized. The usage amount of the auxiliaries is less, the roasting temperature is lower, the potassium extraction rate is higher, and the energy consumption is lower. The selected auxiliaries are wide in source and low in price, and the production cost is low.

Description

Technical field [0001] The invention relates to a new method for comprehensive utilization of water-insoluble potash ore and preparing potash fertilizer, in particular to a method for extracting soluble potassium by using water-insoluble potash ore. Background technique [0002] my country is a country with extremely shortage of soluble potassium resources, and the per capita reserves of soluble potassium are only one-fourteenth of the world average. Potassium fertilizer application is one of the most important factors to improve the quality of crops. my country's dependence on potash fertilizer has reached more than 60%, which has endangered my country's food security. However, my country's water-insoluble potash mineral resources are very rich. Accelerating the development and utilization of water-insoluble potash minerals to make potash fertilizers and researching potassium extraction technology are of great significance for improving the self-sufficiency rate of potash fertil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/10C22B1/02C22B3/04
CPCY02P10/20
Inventor 李小燕俞为民彭学平陈志辉万夫伟张雪梅高伟强
Owner TIANJIN CEMENT IND DESIGN & RES INST