A method for extracting potassium mirabilite concentrate by using sulfate type potassium mixed salt flotation

Abstract

The invention discloses a method for floating and extracting glaserite concentrate by utilizing sulfate-type potassium mixed salt. The method comprises the following steps: (1) grinding an ore-grinding inlet material with potassium mixed salt raw ore and potassium mixed salt co-saturation mother liquid in the mass ratio of 1:0.7-1 to obtain ore pulp which is subjected to ore grinding; (2) adding the potassium mixed salt co-saturation mother liquid into the ore pulp which is subjected to the ore grinding to regulate the pulp, regulating a pH value, adding 80 to 120 g of glaserite collecting agent into every ton of potassium mixed salt raw ore, stirring, and performing rough floating to obtain a foam product A1 and ore pulp B1 in a tank; (3) adding the foam product A1 into the potassium mixed salt co-saturation mother liquid to regulate the pulp, performing fine floating to obtain a foam product A2 and ore pulp B2 in the tank, and filtering the foam product A2 to obtain the glaserite concentrate. According to the method, a normal temperature floating process is adopted; the energy consumption is low; the process is simple; the separation efficiency is high; the glaserite concentrate with Na2SO4.3K2SO4 at the grade of 85 to 93 percent is obtained; the recovery ratio is high; the used floating agent is more environment-friendly.

Description

technical field [0001] The invention relates to a method for extracting Glauber's salt concentrate, in particular to a method for extracting Glauber's salt concentrate by utilizing sulfate type potassium mixed salt flotation. Background technique [0002] Glauber's salt is mainly used in the production of potassium sulfate. Currently, potassium mirabilite (Na 2 SO 4 3K 2 SO 4 ) to produce potassium sulfate in the patent literature and non-patent scientific and technological literature reports, most of them use Glauber's salt (Na 2 SO 4 10H 2 O) directly carry out metathesis reaction with potassium chloride to first synthesize Glauber's salt, and then use Glauber's salt to further react with Potassium chloride to generate potassium sulfate, such as the disclosed methods of CN1202009C, CN1118336A, and CN1075041C, all of which do not involve the use of Glauber's salt ore. [0003] Glauber's salt mainly exists in specific types of salt lakes in nature. According to the ut...

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Problems solved by technology

[0003] Glauber's salt mainly exists in specific types of salt lakes in nature. According to the utilization technology of salt lake resources, the existing separation methods of Glauber's salt include chemical methods and mineral processing methods: (1) Chemical methods, usually using Glauber's salt and NaCl, NaCO 3 Separation of the solubility difference of other impurities, the separation efficiency is low, the energy consumption is high, and the production cycle is long; the flotation method uses the difference in surface chemical properties between Glauber's salt and other impurities, and makes the surface hydrophobic by adding specific flotation agents. After inflating in the flotation machine, it floats up with the air bubbles, and the impurities stay in the flotation tank to achieve the purpose of separating potassium mirabilite from other impurities

Both CN102849757A and CN102626674A disclose the technology of extracting Glauber's salt by flotation using flotation reagents, but they still have some technical defects: 1) The reagents used are sodium petroleum sulfonate, sodium lauryl sulfate and lauryl sulfate The mixture of sodium benzenesulfonate has a benzene ring structure in the drug molecule, which is easy to pollute the environment, and the dosage is large and the cost is high. After conversion, the dosage of CN102849757A is 667-1250g / t raw ore, and the dosage of CN102626674A is up to 133-400g / t raw ore; 2) The grinding particle size is relatively coarse, the grinding fineness of CN102849757A is 40-80 mesh (0.2-0.45mm), and the grinding fineness of CN102626674A is 40 mesh (0.45mm), indicating that potassium mixed The dissociation particle size of salt ore is relatively coarse. From the professional point of view of mineral processing technology, the coarser the crystallization dissociation particle size of minerals is, the more favorable it is for separation. The finer the crystallization dissociation particle size is, the more unfavorable it is for separation. These two patents The crystallization particle size of the potassium mixed salt raw material disclosed in the literature is relatively coarse, and it is relatively easier to sort. However, due to the difference in the degree of crystallization in the raw ore, sometimes it is necessary to grind the ore to a finer particle size before sorting, which will lead to separation. The efficiency is greatly reduced; 3) Each flotation foam product needs to be filtered before it can be selected in the next step, which is time-consuming and laborious, and wastes energy consumption and equipment and site investment required for filtration. The entire process is relatively complicated

Due to the special hydrophobic nature of potassium mirabilite, it is difficult for ordinary potassium salt flotation reagents to float it