Preparation method of polysilicate ferric chloride flocculant

Abstract

The invention discloses a preparation method of polysilicate ferric chloride flocculant. The method is characterized by comprising the following steps: firstly, the preparation of polyferric chloride: adding industrial hydrochloric acid into ground hematite to be conducted to oxidation reaction at 75 to 95 DEG C, performing filtering, obtaining ferric trichloride solution, adjusting the pH value of the ferric trichloride solution to be 1.2 to 1.6, performing aging, and then obtaining polyferric chloride solution; secondly, the preparation of polysilicic acid: gradually adding dilute sulphuric acid into sodium silicate solution, adjusting the pH value to be 1.8 to 2.2, performing activating, and then obtaining polysilicic acid solution; and thirdly, the preparation of polysilicate ferric chloride: mixing the polyferric chloride solution and the polysilicic acid according to the quantity relative ratio of iron to silicon being 1:1, adjusting the pH value of the mixed solution to be 1.8 to 2.2 at 38 to 42 DEG C, performing seasoning, and then obtaining polysilicate ferric chloride solution. The flocculant has the advantages that raw material is easily available, the processes are simple, the cost is low, the flocculant is safe to produce and use, and the effect is excellent.

Description

technical field [0001] The invention relates to a preparation method of a polysilicate ferric chloride flocculant, belonging to the technical fields of water purification and waste water treatment. Background technique [0002] The problem of water resources has attracted widespread attention all over the world. In 1998, the World Commission on Environment and Development (WCED) proposed that water resources are replacing oil and may become the main problem causing crises worldwide. my country is a country with severe drought and relatively severe water shortage, and its total water resources ranks sixth in the world at 2,840.5 billion m 3 , only 2210m per capita 3 , which is only 1 / 4 of the world's average level, and there are 13 countries with the poorest per capita water resources in the world, and my country is one of them. According to statistics, 400 of the 669 cities in China have insufficient water supply, and 110 of them are seriously short of water. The shortage...

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Problems solved by technology

However, there will be a certain limit for its raw materials, because the amount of iron filings that can be produced in the iron and steel industry is certain, and it needs to be treated before use, otherwise it will have an adverse impact on the environment, which makes the production process It takes one more step, consumes manpower and material resources, and is uneconomical

And in the preparation method of the polysilicate ferric chloride mentioned in CN1210818A, directly use ferric trichloride as raw material to prepare polyferric chloride, compound with polysilicate again, this method cost is higher, and technique is also more complicated

CN101003390A takes industrial pickling waste liquid and iron oxide scale as main raw materials. According to relevant data, the suspended matter, turbidity and pH value of industrial pickling waste liquid will seriously exceed the standard, which can cause serious environmental pollution. Therefore, according to As mentioned in this method, it should be treated before it is used to achieve the desired effect, which makes it necessary to increase the extra cost in the preparation project, which is not economical.

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