Process for producing potassium chloride by reverse flotation-cold crystallization of salt lake brine potassium and magnesium salt

First, the type of technology

Non-metallic mineral mining and efficient technology.

Second, the scope of application

Extracting potassium from the potassium chloride brine type Saline magnesium ore.

Third, technical content

(1) Basic principles

The reverse flotation-cold crystallization process technology utilizes the different adsorption capacities of carnallite and sodium chloride on special collectors to separate the carnallite from the sodium chloride, so that the purity of the carnallite raw material can be allowed by the process. range (NaCl≤7.0%), then hydrolyzed carnallite, magnesium chloride into the liquid phase, the control system carnallite decomposed degree of supersaturation of potassium chloride, potassium chloride particle growth reaches at normal temperature conditions purpose.

(2) Key technologies

1. Reverse flotation reagent technology: Separating the carnallite ore from sodium chloride, so that the purity of the salt field carnallite raw material reaches the allowable range of the process (NaCl ≤ 7.0%)

2. Carnallite decomposition crystallizer technology: control the carnallite decomposition system, the carnallite decomposition, magnesium chloride into the liquid phase, potassium chloride crystal particles grow.

3. Complete equipment design and manufacturing technology: to achieve effective linkage of various processes to ensure the scale, large-scale and high-efficiency of potash production.

(three) process

Yantian carnallite mine is harvested by water mining ship → thickener → reverse flotation operation → low sodium carnallite → cold crystallizer → crude potassium product → washing → drying → finished potassium chloride

Fourth, the main technical indicators

The KCl content of potassium chloride products is ≥95%, the recovery rate is ≥55%, the average particle size is 0.2mm, and the product meets the national standard (GB6549-1996) Class II first class quality standard.

V. Typical examples and results

Qinghai Salt Lake Potash Co., Ltd. invested 240 million yuan to carry out 400,000 tons of reverse flotation cold crystallization crystallization expansion technology for 200,000 tons of potassium chloride cold decomposition flotation device, which is more than the traditional cold decomposition flotation process It has saved 9.4 million tons of potassium chloride resources. The average annual sales income in the past three years exceeded 100 million yuan, and the average annual profit exceeded 300 million yuan. The economic benefits are remarkable.

Qinghai Salt Lake Development Branch invested 2.5 billion yuan to build a new annual output of 1 million tons of potassium chloride (potassium fertilizer) project, which saves 234,000 tons of potassium chloride resources per year compared with the traditional cold decomposition flotation process. The average annual sales revenue in the past three years exceeds The annual profit is 2.6 billion yuan, and the average annual profit is more than 1.2 billion yuan. The internal evaluation rate of the post-evaluation report is 26.83%, and the economic benefits are remarkable.

Six, promotion prospects

Salt lake brine potassium and magnesium salt reverse flotation-cold crystallization process to produce potassium chloride can replace traditional potassium salt hot melt technology, not only can save potassium chloride resources, but also can use traditional cold decomposition flotation method, halogen salt method The medium and small-scale potassium chloride (potassium fertilizer) production equipment carries out reverse flotation-cold crystallization process reform and equipment integration, and promotes the overall upgrading of technology upgrading, product upgrading and ore recovery rate, thereby realizing the utilization level of salt lake potassium mine in China. The upgrade will promote a new leap in China's potash production technology level, and make a positive contribution to the country's saving of potassium resources and increasing the total amount of domestic potash. The comprehensive utilization potential is huge.

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