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Process for producing potassium chloride by using carnallite

A carnallite and potassium chloride technology, applied in the direction of alkali metal chlorides, etc., can solve the problems of high consumption of fresh water and low yield of potassium chloride, so as to ensure complete decomposition, reduce the content of potassium chloride, and reduce the consumption Effect

Active Publication Date: 2018-11-23
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of technology that utilizes carnallite ore to produce potassium chloride, be used to solve the problem that crystallization process fresh water consumption is high, potassium chloride yield is low in the technology that existing carnallite ore produces potassium chloride question

Method used

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  • Process for producing potassium chloride by using carnallite

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Embodiment 1

[0029] The present embodiment provides a kind of technique that utilizes carnallite ore to produce Potassium Chloride, comprises the steps:

[0030] S1 flotation: Carnallite ore is processed by flotation to produce low-sodium carnallite.

[0031] In order to improve the recovery rate of potassium chloride in the overall process, the flotation treatment in this step is preferably a reverse flotation treatment process. Wherein, the reverse flotation treatment process includes the following steps in turn:

[0032] S11 Crushing and screening: The large pieces of carnallite ore obtained by mining are crushed and screened to form small pieces of carnallite ore. Specifically, the size of the small pieces of carnallite ore is less than 20 mm.

[0033] S12 Preparation of slurry: Mix small pieces of carnallite with saturated brine, and use the first thickener to achieve preliminary settlement to form bottom slurry.

[0034] S13 Flotation treatment: Add the slurry to the flotation mach...

Embodiment 2

[0052] This embodiment is roughly the same as Embodiment 1, except that in the S2 crystallization process, 55% of the low-sodium carnallite is added to the first-stage crystallizer, and 45% of the low-sodium carnallite is added to the second-stage crystallizer.

[0053] After processing and calculation, the yield of potassium chloride in the present embodiment is 75%.

Embodiment 3

[0055] This embodiment is roughly the same as Embodiment 1, except that in the S2 crystallization process, 75% of low-sodium carnallite is added to the first-stage crystallizer, and 25% of low-sodium carnallite is added to the second-stage crystallizer.

[0056] After processing and calculation, the yield of potassium chloride in the present embodiment is 78%.

[0057] Visible by embodiment one~embodiment three, the present invention adopts two sections of crystallizers to be connected in series to realize in the crystallization process, and the fresh water amount that adopts is identical with the fresh water amount that adopts one section of crystallizers, not only makes low after flotation treatment Sodium carnallite is completely decomposed, and the content of potassium chloride in the overflow liquid is reduced, so that the yield of potassium chloride in the present invention is increased to more than 75%.

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Abstract

The invention relates to a process for producing potassium chloride by using carnallite. The process comprises the steps: S1. flotation: subjecting the carnallite to flotation treatment, so as to prepare low-sodium carnallite; S2. crystallization: adding isometric plain water into a first-section crystallizer and a second-section crystallizer, adding 55% to 75% of the low-sodium carnallite into the first-section crystallizer, adding 25% to 45% of the low-sodium carnallite into the second-section crystallizer, conveying underflow slurry formed in the first-section crystallizer into the second-section crystallizer for continuous decomposed crystallization, and carrying out decomposition in the second-section crystallizer, so as to form coarse-potassium slurry; S3. aftertreatment: subjectingthe coarse-potassium slurry to subsequent treatment, thereby preparing the product potassium chloride. According to the process for producing the potassium chloride by using the carnallite, provided by the invention, the low-sodium carnallite subjected to flotation is subjected to crystallizing treatment by connecting two sections of crystallizers in series, so that the complete decomposition of the low-sodium carnallite in a crystallization process is guaranteed, the content of potassium chloride in overflow liquor during crystallization is fundamentally lowered, and thus, the yield of the potassium chloride is increased to 75% or more.

Description

technical field [0001] The invention relates to the technical field of inorganic salt production technology, in particular to a technology for producing potassium chloride by utilizing carnallite ore. Background technique [0002] At present, there are two main methods for producing potassium chloride in the domestic inorganic salt industry: the first one uses sea salt carnallite as raw material, mainly by decomposition and washing; the second one uses salt lake natural carnallite and regenerated carnallite as raw material. Raw materials are mainly forward flotation, reverse flotation and hot melt crystallization. [0003] Among them, the positive flotation method is to dry-quarry the carnallite ore dried in salt fields and transport it to the processing factory. Wash, separate and dry the product. As a traditional potassium chloride production process, the method has a reliable process route and a simple process flow, but the system recovery rate is low and the product qu...

Claims

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Application Information

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IPC IPC(8): C01D3/08
CPCC01D3/08
Inventor 蒋中华黄龙任宏伟史忠录于雪峰包玉存孟浩任青峰应忠燕应忠顺
Owner ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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