Production method of potassium salt

Abstract

The invention provides a manufacturing method of sylvite, the steps comprise potassium mineral decomposition, froth flotation, dual-level filtration and reusing of waste and brine, wet materials filtration, washing, centrifugation and drying, and then the product is obtained. The invention solves the problems that the existing production technique for sylvite is high in fresh water consumption, high in potassium ion loss, high in froth flotation waste and brine discharge amount and polluted in organic pollution in salt field and the like. The manufacturing method of sylvite is simple in routing, low in fresh water consumption, high in potassium ion recovery rate, low in froth flotation waste and brine discharge amount, high in availability of resources and the like.

Description

Technical field: [0001] The invention relates to potassium chloride, in particular to a production method of potassium salt. Background technique: [0002] my country is a country that consumes a large amount of potassium salt, but it is also a country that is very scarce in potassium resources. my country's potassium salt reserves are mainly concentrated in the Qaidam Basin in Qinghai and the Tarim Basin in Xinjiang, and the potassium salt is mainly potassium chloride. The main production method of salt is the "cold crystallization-flotation" combined process method. This process requires that the potassium-containing minerals be hydrolyzed to obtain potassium chloride crystallization, and then enter the flotation process to select the target product with the help of the flotation agent. The goal of purifying products is achieved by permanent flotation separation. This process has low energy consumption, low construction investment, and simple technical process, but the produ...

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Problems solved by technology

[0002] my country is a country that consumes a large amount of potassium salt, but it is also a country that is very scarce in potassium resources. my country's potassium salt reserves are mainly concentrated in the Qaidam Basin in Qinghai and the Tarim Basin in Xinjiang, and the potassium salt is mainly potassium chloride. The main production method of salt is the "cold crystallization-flotation" combined process method. This process requires that the potassium-containing minerals be hydrolyzed to obtain potassium chloride crystallization, and then enter the flotation process to select the target product with the help of the flotation agent. The goal of purifying products is achieved by permanent flotation separation. This process has low energy consumption, low construction investment, and simple technical process, but the production process consumes a lot of water, which leads to the destruction of the balance of the water-salt system, the decrease in the yield of potassium ions, and the increase in the discharge of waste brine. , a serious waste of resources

According to research and practice, flotation reagents have an inhibitory effect on the decomposition and crystallization of potassium minerals, so the waste brine from flotation has not been directly used. At present, the discarded waste brine has formed a vast lake area, and the waste brine discharged into the lake area, except for a part of precipitation Extracrystalline (MgCl 2 ·6H 2 O), most of which are lost in the storage process, and return to the original brine of the salt lake in the form of leakage, which will inevitably cause the chemical composition of the original brine to be out of balance for a long time, endanger the further development of the salt lake resources, and increase the recovery of potassium Cost and energy consumption, reducing the operating efficiency of equipment and the degradation rate of organic matter

At present, under the concept of protecting the ecological environment, improving resource utilization, and achieving sustainable development, how to improve the status quo of large water consumption, large amount of waste brine, and low product yield is an urgent problem to be solved. question

[0003] The United States, Chile, Israel and other countries are currently the most reasonable and advanced countries in the development and utilization of salt lake brine resources in t

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