A kind of calcium chloride wastewater treatment process

A wastewater treatment and calcium chloride technology, applied in the direction of backflow water treatment, natural water treatment, multi-stage water treatment, etc., can solve the cost of increasing packaging materials, labor, energy consumption, calcium chloride product backlog, calcium chloride Problems such as large amount of waste water, to achieve the effect of low cost, improved purity, and extended service life

Active Publication Date: 2021-06-18
石家庄工大科技开发有限公司
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  • Description
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AI Technical Summary

Problems solved by technology

However, the amount of calcium chloride wastewater in the fly ash aluminum industry is large, which will cause a serious backlog of calcium chloride products. Due to the strong moisture absorption of calcium chloride, it has been placed in the warehouse for more than two months. It will increase by more than 1%, which will cause rework and increase the cost of packaging materials, labor, energy consumption, etc.

Method used

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  • A kind of calcium chloride wastewater treatment process

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Experimental program
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Effect test

Embodiment 1

[0036] like figure 1 As shown, a calcium chloride wastewater treatment process, wherein the wastewater comes from the wastewater produced by the fly ash aluminum industry, the specific process steps are firstly using a three-effect multi-stage evaporator to treat the calcium chloride wastewater to obtain primary wastewater, namely chlorination Calcium waste water (raw material liquid) enters the raw steam condensate preheater 1 through the feeding pump for preheating, and then enters the three-effect separation chamber 8, the three-effect heating chamber 7, and the second-effect separation chamber 6 in turn after the temperature is preheated to 88°C Carry out evaporative concentration with two-effect heating chamber 5, one-effect separation chamber 4 and one-effect heating chamber 3, and the concentration of calcium chloride waste water is raised to 48% by 20%. Among them, the liquid phase temperatures of the three-effect separation chamber 8, the second-effect separation cham...

Embodiment 2

[0041] like figure 1 As shown, a calcium chloride wastewater treatment process, wherein the wastewater comes from the wastewater produced by the fly ash aluminum industry, the specific process steps are firstly using a three-effect multi-stage evaporator to treat the calcium chloride wastewater to obtain primary wastewater, namely chlorination Calcium waste water (raw material liquid) enters the raw steam condensate preheater 1 through the feeding pump for preheating, and then enters the three-effect separation chamber 8, the three-effect heating chamber 7, and the second-effect separation chamber 6 in turn after the temperature is preheated to 92°C Carry out evaporation and concentration with the second-effect heating chamber 5, the first-effect separation chamber 4 and the first-effect heating chamber 3, and the concentration of the calcium chloride wastewater increases from 21% to 49%. Among them, the liquid phase temperatures of the three-effect separation chamber 8, the s...

Embodiment 3

[0046] like figure 1 As shown, a calcium chloride wastewater treatment process, wherein the wastewater comes from the wastewater produced by the fly ash aluminum industry, the specific process steps are firstly using a three-effect multi-stage evaporator to treat the calcium chloride wastewater to obtain primary wastewater, namely chlorination Calcium waste water (raw material liquid) enters the raw steam condensate preheater 1 through the feeding pump for preheating, and then enters the three-effect separation chamber 8, the three-effect heating chamber 7, and the second-effect separation chamber 6 after the temperature is preheated to 90°C Carry out evaporative concentration with two-effect heating chamber 5, one-effect separation chamber 4 and one-effect heating chamber 3, and the concentration of calcium chloride waste water is raised to 50% by 22%. Among them, the liquid phase temperatures of the three-effect separation chamber 8, the second-effect separation chamber 6, a...

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Abstract

The invention discloses a process for treating calcium chloride wastewater, which belongs to the field of industrial wastewater treatment. It includes firstly using a three-effect multistage evaporator to treat calcium chloride wastewater to obtain primary wastewater, and then performing vacuum high-temperature flash evaporation on the primary wastewater to obtain secondary wastewater. The solid-liquid separation of the secondary wastewater is carried out to obtain calcium chloride dihydrate solid and mother liquor, and then part of the mother liquor is transferred to the impurity removal tank to obtain the third-stage wastewater, and the third-stage wastewater and the remaining mother liquor are returned to the three-effect multi-stage evaporator for circulation deal with. The invention improves the purity of the waste water treatment product calcium chloride dihydrate, the three-effect multi-stage evaporator gradiently increases the temperature of the waste water, and the evaporation conditions are relatively mild, which not only realizes the effective evaporation and concentration of the calcium chloride waste water, but also prevents crystal plugging The problem of pipes; part of the mother liquor is subjected to impurity removal treatment, which prevents the enrichment of impurities and effectively improves the purity of the product; at the same time, the present invention also has the advantages of simple process and low cost.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a calcium chloride wastewater treatment process, which belongs to the technical field of industrial wastewater treatment. Background technique [0002] Fly ash is the fine ash collected from the flue gas after coal combustion, and is the main solid waste discharged from coal-fired power plants. The oxide composition of fly ash in thermal power plants in my country is SiO 2 、Al 2 o 3 And a small amount of FeO, Fe 2 o 3 , CaO, MgO, SO 3 、TiO 2 etc., where SiO 2 and Al 2 o 3 content can account for more than 60% of the total content. Fly ash is one of the largest industrial wastes in my country. With the development of the power industry, the discharge of fly ash from coal-fired power plants is increasing year by year. If a large amount of fly ash is not treated, it will generate dust and pollute the atmosphere; if it is discharged into the water system, it will cause riv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/34
CPCC02F1/001C02F1/04C02F1/06C02F1/52C02F1/66C02F9/00C02F2103/34C02F2301/04C02F2301/063C02F2301/08
Inventor 张继军李霞邸倩倩
Owner 石家庄工大科技开发有限公司
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